Abstract:
A jet pump and method of using the jet pump for removing fluids and solids from a conduit. The jet pump is adapted for use with a spoolable multi-string tubing system. The jet pump may be deployed rapidly and is suitable for temporary installation. The method may be used to reestablish flow in watered out and sanded off wells, or to test wells. The jet pump is adapted to remove wellbore fluid, which may be removed in combination with power fluid. The spoolable multi-string tubing system includes two or more substantially parallel conduits, allowing power fluid and return fluid to flow in separate conduits. Preferred embodiments provide additional functionality by inclusion of jetting elements, sensing elements, back-pressure valves, and auxiliary tubing strings or communication members in the spoolable multi-string tubing system.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of priority of U.S. Provisional Patent Application No. 61/158,977 filed Mar. 10, 2009, which is incorporated herein by reference in its entirety. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates generally to jet pumps. More particularly, the present invention relates to jet pumps for clean out and testing of a conduit. 
       BACKGROUND OF THE INVENTION 
       [0003]    Various oil and gas well operations will benefit from a suitable system allowing rapid deployment of temporary equipment to allow rapid and efficient removal of liquids and entrained solids from a wellbore. Preferably, such a system further provides a method for removing solids, for example sand or formation fines, which block the wellbore. In one application, it may be desirable to remove a fixed quantity of wellbore fluid to reestablish flow in a gas well. 
         [0004]    A common technique used to remove wellbore fluid from a wellbore includes running conventional coiled tubing into the well and pumping compressed air or nitrogen gas into the wellbore to gas lift the fluid to surface. This approaches may overpressure the wellbore, pushing at least a portion of the wellbore fluid back into the formation (as opposed to being pumped to the surface). Furthermore, nitrogen gas is costly, while use of compressed air carries safety concerns. 
         [0005]    Following fracturing of a well, it may be desirable to have available a rapidly-deployable temporary system to remove fracture treatment fluid from the well. Preferably, the system would is capable of reporting real-time data pertaining to conditions such as flowing bottomhole pressure and temperature. The data facilitates assessment of reservoir characteristics and determination of optimal permanent production and pumping equipment. Without installing permanent pumping equipment, the options to accomplish the above are otherwise limited. 
         [0006]    Jet pumps are useful in a wide range of well applications. Nonetheless, jet pumps for use in hydrocarbon recovery are a relatively underdeveloped technology. 
         [0007]    U.S. Pat. No. 5,372,190 discloses a downhole jet pump useful with various types of wells, including gas wells which produce a large ratio of water and may include considerable abrasive solid materials. The downhole jet pump can be run and retrieved inside coil tubing, or conventional threaded pipe, of relatively small diameters. The embodiments of the jet pump disclosed enable removal, replacement or adjustment to provide optimum operation of the pump in accordance with installation requirements without the use of special tools. 
         [0008]    To date, jet pump systems have been installed using either conventional jointed tubing or conventional coiled tubing. In some of these installations, the process requires that there be two strings installed in the well. Where two strings are used, they are most typically configured as a tubing string inside of a tubing string, or a concentric configuration. In most of these applications the tubing systems are not adapted for rapid deployment and retrieval. 
         [0009]    U.S. Pat. No. 5,033,545 discloses a jet pump that brings a power fluid to sedimented solids and the like plugging a conduit, and includes at least one nozzle which directs the power fluid in a high-velocity jet against the solids to bring the solids into suspension for subsequent removal thereof using the jet pump principle. 
         [0010]    There are operational and technical advantages to configuring the system with two or more parallel tubing strings or electrical conductors. However, until recently significant practical problems with this approach had not been addressed. The present invention provides a jet pump which is readily deployed and installed in a wellbore using a single conventional coiled tubing unit. Combining the jet pump with a spoolable multi-string tubing system facilitates a broad range of applications. 
         [0011]    It is, therefore, desirable to provide a system and method for jet pump and multi-string tubing for well clean out and testing. 
       SUMMARY OF THE INVENTION 
       [0012]    It is an object of the present invention to obviate or mitigate at least one disadvantage of previous jet pumps. 
         [0013]    In a first aspect, the present invention provides a jet pump adapted for use with a spoolable multi-string tubing system including two or more conduits, the conduits being substantially parallel, and the jet pump including a jet pump intake, a venturi nozzle, a venturi gap, and a diffuser. 
         [0014]    In an embodiment of the invention, the jet pump includes a jetting sub. 
         [0015]    In an embodiment of the invention, the jetting sub includes a back-pressure valve. 
         [0016]    In an embodiment of the invention, the back-pressure valve includes a ball, spring, and seat. 
         [0017]    In an embodiment of the invention, the jetting sub includes a jetting nozzle. 
         [0018]    In an embodiment of the invention, the jetting sub includes an upper flow choke. 
         [0019]    In an embodiment of the invention, the upper flow choke is adapted to limit flow of jetting fluid that may otherwise occur if the jetting nozzle washes out. 
         [0020]    In an embodiment of the invention, the jetting sub includes one or more lateral jetting ports. 
         [0021]    In an embodiment of the invention, the jetting nozzle includes a converging jetting passage and a diverging jetting passage, the converging jetting passage and the diverging jetting passage forms a jetting pinch, the dimensions of the jetting pinch selected to provide back-pressure for the jetting nozzle. 
         [0022]    In an embodiment of the invention, the jetting nozzle includes an abrasion-resistant elastomeric insert located radially outward from the diverging jetting passage. 
         [0023]    In an embodiment of the invention, the jetting nozzle includes a jetting passage insert. 
         [0024]    In an embodiment of the invention, the jetting nozzle includes a disposable nose. 
         [0025]    In an embodiment of the invention, the jet pump intake includes slots. 
         [0026]    In an embodiment of the invention, the slots include an opening dimension selected relative to the venturi gap. 
         [0027]    In an embodiment of the invention, the jet pump including a check valve. 
         [0028]    In an embodiment of the invention, the jet pump including a unibody jet pump body. 
         [0029]    In an embodiment of the invention, the jet pump including a double-barrel jet pump body. 
         [0030]    In an embodiment of the invention, the jet pump including a jetting flow passage and a venturi inlet, the jetting flow passage in fluid communication with the venturi inlet, and the jetting sub in fluid communication with the jetting flow passage. 
         [0031]    In an embodiment of the invention, the two or more conduits include a supply tubing string and a return tubing string. 
         [0032]    In an embodiment of the invention, the two or more conduits include a supply tubing string, a return tubing string, and an auxiliary tubing string. 
         [0033]    In an embodiment of the invention, the two or more conduits include a supply tubing string, a return tubing string, and an auxiliary tubing string, the jetting flow passage is in fluid communication with the auxiliary tubing string, and the jetting sub in fluid communication with the jetting flow passage. 
         [0034]    In an embodiment of the invention, the two or more conduits include a supply tubing string, a return tubing string, and a communications line. 
         [0035]    In an embodiment of the invention, the jet pump includes a data-sensing sub. 
         [0036]    In an embodiment of the invention, the two or more conduits include a supply tubing string, a return tubing string, and a communications line. 
         [0037]    In an embodiment of the invention, the jet pump includes a jetting flow valve located along the jetting flow passage, the jetting flow valve operatively connected with the communications line, and the jetting flow valve adapted to selectively obstruct flow of jetting fluid through the jetting flow passage. 
         [0038]    In a further aspect, the present invention provides a method of cleaning a wellbore including: 
         [0039]    providing a spoolable multi-string tubing system including two or more conduits, the two or more conduits including a supply tubing string and a return tubing string; 
         [0040]    providing a jet pump including a jet pump intake, a venturi nozzle, a venturi gap, and a diffuser; 
         [0000]    establishing fluid communication between the two or more conduits and the jet pump; 
         [0041]    deploying the jet pump into the wellbore; 
         [0042]    providing power fluid to the jet pump via the supply tubing string; and 
         [0043]    receiving return fluid from the jet pump via the return tubing string. 
         [0044]    In a further aspect, the present invention provides a method of cleaning a wellbore including: 
         [0045]    providing a spoolable multi-string tubing system including two or more conduits, the two or more conduits including a supply tubing string and a return tubing string; 
         [0046]    providing a jet pump including a jet pump intake, a venturi nozzle, a venturi gap, a diffuser, and a jetting sub; 
         [0047]    establishing fluid communication between the two or more conduits and the jet pump; 
         [0048]    deploying the jet pump into the wellbore; 
         [0049]    providing power fluid to the jet pump via the supply tubing string; and 
         [0050]    receiving return fluid from the jet pump via the return tubing string. 
         [0051]    In an embodiment of the invention, the method includes flowing jetting fluid out of the jetting nozzle while receiving return fluid from the jet pump via the return tubing string. 
         [0052]    In an embodiment of the invention, the method includes: 
         [0053]    ceasing to receive return fluid from the jet pump via the return tubing string; 
         [0054]    flowing jetting fluid out of the jetting sub; 
         [0055]    ceasing to flow jetting fluid out of the jetting sub; and 
         [0056]    receiving return fluid from the jet pump via the return tubing string. 
         [0057]    In a further aspect, the present invention provides a method of cleaning a wellbore including: 
         [0058]    providing a spoolable multi-string tubing system including two or more conduits, the two or more conduits including a supply tubing string and a return tubing string; 
         [0059]    providing a jet pump including a jet pump intake, a venturi nozzle, a venturi gap, a diffuser, and a jetting sub, the jetting sub including a back-pressure valve; 
         [0060]    establishing fluid communication between the two or more conduits and the jet pump; 
         [0061]    deploying the jet pump into the wellbore; 
         [0062]    providing power fluid to the jet pump via the supply tubing string; and 
         [0063]    receiving return fluid from the jet pump via the return tubing string. 
         [0064]    In an embodiment of the invention, the method includes flowing jetting fluid out of the jetting nozzle while receiving return fluid from the jet pump via the return tubing string. 
         [0065]    In an embodiment of the invention, the method includes: 
         [0066]    ceasing to receive return fluid from the jet pump via the return tubing string; 
         [0067]    flowing jetting fluid out of the jetting sub; 
         [0068]    ceasing to flow jetting fluid out of the jetting sub; and 
         [0069]    receiving return fluid from the jet pump via the return tubing string. 
         [0070]    In a further aspect, the present invention provides a method of cleaning a wellbore including: 
         [0071]    providing a spoolable multi-string tubing system including two or more conduits, the two or more conduits including a supply tubing string, a return tubing string, and a communications line; 
         [0072]    providing a jet pump including a jet pump intake, a venturi nozzle, a venturi gap, a diffuser, and a data-sensing sub; 
         [0073]    establishing fluid communication between the jet pump and the supply tubing string, and between the return tubing string and the jet pump; 
         [0074]    establishing an operative connection between the data-sensing sub and the communications line; 
         [0075]    deploying the jet pump into the wellbore; 
         [0076]    sensing data with the data-sensing sub; and 
         [0077]    receiving the data at the surface via the communications line. 
         [0078]    In an embodiment of the invention, the method includes providing power fluid to the jet pump via the supply tubing string and receiving return fluid from the jet pump via the return tubing string. 
         [0079]    In a further aspect, the present invention provides a method of cleaning a wellbore including: 
         [0080]    providing a spoolable multi-string tubing system including two or more conduits, the two or more conduits including a supply tubing string, a return tubing string, and a communications line; 
         [0081]    providing a jet pump including a jet pump intake, a venturi nozzle, a venturi gap, a diffuser, a jetting sub, and a data-sensing sub; 
         [0082]    establishing fluid communication between the two or more conduits and the jet pump; 
         [0083]    establishing an operative connection between the data-sensing sub and the communications line; 
         [0084]    deploying the jet pump into the wellbore; 
         [0085]    sensing data with the data-sensing sub; and 
         [0086]    receiving the data at the surface. 
         [0087]    In an embodiment of the invention, the method includes providing power fluid to the jet pump via the supply tubing string and receiving return fluid from the jet pump via the return tubing string. 
         [0088]    In an embodiment of the invention, the method includes flowing jetting fluid out of the jetting nozzle while receiving return fluid from the jet pump via the return tubing string. 
         [0089]    In an embodiment of the invention, the method includes: 
         [0090]    ceasing to receive return fluid from the jet pump via the return tubing string; 
         [0091]    flowing jetting fluid out of the jetting sub; 
         [0092]    ceasing to flow jetting fluid out of the jetting sub; and 
         [0093]    receiving return fluid from the jet pump via the return tubing string. 
         [0094]    In a further aspect, the present invention provides a method of cleaning a wellbore including: 
         [0095]    providing a spoolable multi-string tubing system including two or more conduits, the two or more conduits including a supply tubing string, a return tubing string, and an auxiliary tubing string; 
         [0096]    providing a jet pump including a jet pump intake, a venturi nozzle, a venturi gap, a diffuser, a jetting flow passage, and a jetting sub; 
         [0097]    establishing fluid communication between the two or more conduits and the jet pump; 
         [0098]    deploying the jet pump into the wellbore; 
         [0099]    providing power fluid to the jet pump via the supply tubing string; and 
         [0100]    receiving return fluid from the jet pump via the return tubing string. 
         [0101]    In an embodiment of the invention, the method includes flowing jetting fluid out of the jetting sub while receiving return fluid from the jet pump via the return tubing string. 
         [0102]    In an embodiment of the invention, the method includes: 
         [0103]    ceasing to receive return fluid from the jet pump via the return tubing string; 
         [0104]    flowing jetting fluid out of the jetting sub; 
         [0105]    ceasing to flow jetting fluid out of the jetting sub; and 
         [0106]    receiving return fluid from the jet pump via the return tubing string. 
         [0107]    In a further aspect, the present invention provides a method of cleaning a wellbore including: 
         [0108]    providing a spoolable multi-string tubing system including two or more conduits, the two or more conduits including a supply tubing string, a return tubing string, and a communications line; 
         [0109]    providing a jet pump including a jet pump intake, a venturi nozzle, a venturi gap, a diffuser, a jetting sub, a jetting flow passage, and a jetting flow valve; 
         [0110]    establishing fluid communication between the jet pump and the supply tubing string, and between the return tubing string and the jet pump; 
         [0111]    establishing an operative connection between the jetting flow valve and the communications line; 
         [0112]    deploying the jet pump into the wellbore; 
         [0113]    providing power fluid to the jet pump via the supply tubing string; and 
         [0114]    receiving return fluid from the jet pump via the return tubing string. 
         [0115]    In an embodiment of the invention, the method includes flowing jetting fluid out of the jetting nozzle while receiving return fluid from the jet pump via the return tubing string. 
         [0116]    In an embodiment of the invention, the method includes: 
         [0117]    ceasing to receive return fluid from the jet pump via the return tubing string; 
         [0118]    flowing jetting fluid out of the jetting sub; 
         [0119]    ceasing to flow jetting fluid out of the jetting sub; and 
         [0120]    receiving return fluid from the jet pump via the return tubing string. 
         [0121]    In a further aspect, the present invention provides a method of cleaning a wellbore including: 
         [0122]    providing a spoolable multi-string tubing system including two or more conduits, the two or more conduits including a supply tubing string, a return tubing string, a first communications line, and a second communications line; 
         [0123]    providing a jet pump including a jet pump intake, a venturi nozzle, a venturi gap, a diffuser, a jetting sub, a jetting flow passage, a data-sensing sub, and a jetting flow valve; 
         [0124]    establishing fluid communication between the jet pump and the supply tubing string, and between the return tubing string and the jet pump; 
         [0125]    establishing an operative connection between the data-sensing sub and the first communications line; 
         [0126]    establishing an operative connection between the jetting flow valve and the second communications line; 
         [0127]    deploying the jet pump into the wellbore; 
         [0128]    sensing data with the data-sensing sub; and 
         [0129]    receiving the data at the surface. 
         [0130]    In an embodiment of the invention, the method includes providing power fluid to the jet pump via the supply tubing string; and receiving return fluid from the jet pump via the return tubing string. 
         [0131]    In an embodiment of the invention, the method includes flowing jetting fluid out of the jetting nozzle while receiving return fluid from the jet pump via the return tubing string. 
         [0132]    In an embodiment of the invention, the present invention provides a method of cleaning a wellbore further including: 
         [0133]    ceasing to receive return fluid from the jet pump via the return tubing string; 
         [0134]    flowing jetting fluid out of the jetting sub; 
         [0135]    ceasing to flow jetting fluid out of the jetting sub; and 
         [0136]    receiving return fluid from the jet pump via the return tubing string. 
         [0137]    In a further aspect, the present invention provides a jetting sub for a jet pump including a jetting nozzle and a back-pressure valve. 
         [0138]    In an embodiment of the invention, the back-pressure valve includes a ball, spring, and seat, the spring adapted to resist compression when exposed to fluid pressures lower than a selected back-pressure setting. 
         [0139]    Other aspects and features of the present invention will become apparent to those ordinarily skilled in the art upon review of the following description of specific embodiments of the invention in conjunction with the accompanying Figures. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0140]    Embodiments of the present invention will now be described, by way of example only, with reference to the attached Figures, wherein: 
           [0141]      FIG. 1  is a schematic illustrating deployment of a jet pump and spoolable multi-string tubing system of the present invention; 
           [0142]      FIG. 2  is a jet pump of the present invention; 
           [0143]      FIG. 3  is a multi-string tubing system for use with the jet pump of  FIG. 2 ; 
           [0144]      FIG. 4  is a cross section of one embodiment of a jet pump body of the jet pump of  FIG. 2 ; 
           [0145]      FIG. 5  is a cross section of a further embodiment of a jet pump body of the jet pump of  FIG. 2 ; 
           [0146]      FIG. 6  is a cross section of a further embodiment of a jet pump body of the jet pump of  FIG. 2 ; 
           [0147]      FIG. 7  is a jet pump of the present invention having an auxiliary tubing string; 
           [0148]      FIG. 8  is a multi-string tubing system for use with the jet pump of  FIG. 7 ; 
           [0149]      FIG. 9  is a cross section of a jet pump body of the jet pump of  FIG. 7 ; 
           [0150]      FIG. 10  is a jet pump of the present invention having a data-sensing sub; 
           [0151]      FIG. 11  is a multi-string tubing system for use with the jet pump of  FIG. 10 ; 
           [0152]      FIG. 12  is a cross section of a jet pump body of the present invention having a jetting flow valve; 
           [0153]      FIG. 13  is a jet pump of the present invention having a first communications line and a second communications line; 
           [0154]      FIG. 14  is a multi-string tubing system for use with the jet pump of  FIG. 13 ; 
           [0155]      FIG. 15  is a cross section of a jet pump body of the jet pump of  FIG. 13 ; 
           [0156]      FIG. 16  is a jet pump of the present invention having a dual-barrel jet pump body; 
           [0157]      FIG. 17  is a jetting sub of the present invention; 
           [0158]      FIG. 18  is a jetting sub of the present invention having a flow control choke; 
           [0159]      FIG. 19  is a jetting sub of the present invention having a back-pressure valve; 
           [0160]      FIG. 20  is one embodiment of a jetting nozzle of the present invention; 
           [0161]      FIG. 21  is a further embodiment of the jetting nozzle of  FIG. 20 ; 
           [0162]      FIG. 22  is a jet pump intake of the present invention; 
           [0163]      FIG. 23  depicts a method of the present invention of using one embodiment of a jet pump and multi-string tubing system to sequentially remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0164]      FIG. 24  depicts a method of the present invention of using the jet pump and multi-string tubing system of  FIG. 23  to sequentially remove wellbore fluid, and simultaneously remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0165]      FIG. 25  depicts a method of the present invention of using the jet pump and multi-string tubing system of  FIG. 23  to simultaneously remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0166]      FIG. 26  depicts a method of the present invention of using one embodiment of a jet pump and multi-string tubing system to sequentially remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0167]      FIG. 27  depicts a method of the present invention of using the jet pump and multi-string tubing system of  FIG. 26  to sequentially remove wellbore fluid, and simultaneously remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0168]      FIG. 28  depicts a method of the present invention of using the jet pump and multi-string tubing system of  FIG. 26  to simultaneously remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0169]      FIG. 29  depicts a method of the present invention of using one embodiment of a jet pump and multi-string tubing system to sequentially remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0170]      FIG. 30  depicts a method of the present invention of using the jet pump and multi-string tubing system of  FIG. 29  to sequentially remove wellbore fluid, and simultaneously remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0171]      FIG. 31  depicts a method of the present invention of using the jet pump and multi-string tubing system of  FIG. 29  to simultaneously remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0172]      FIG. 32  depicts a method of the present invention of using one embodiment of a jet pump and multi-string tubing system to sequentially remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0173]      FIG. 33  depicts a method of the present invention of using the jet pump and multi-string tubing system of  FIG. 32  to sequentially remove wellbore fluid, and simultaneously remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0174]      FIG. 34  depicts a method of the present invention of using the jet pump and multi-string tubing system of  FIG. 32  to simultaneously remove wellbore fluid and eliminate obstructions from the wellbore; 
           [0175]      FIG. 35  is a jetting sub of the present invention having lateral jetting ports; 
           [0176]      FIG. 36  is a jetting sub of the present invention having a flow control choke and lateral jetting ports; and 
           [0177]      FIG. 37  is a jetting sub of the present invention having a back-pressure valve and lateral jetting ports. 
       
    
    
     DETAILED DESCRIPTION 
       [0178]    Generally, the present invention provides a device and method for cleaning out and testing wells and other conduits using a jet pump and tubing. The present invention may be used as a rapid-deployment process to reestablish flow in, for example, watered or sanded off wells, or as a well testing system. The present invention may also be useful in treatment of, for example, oil, gas, or water wells. The present invention may also be useful in, for example, servicing water supply wells and water disposal wells. The present invention may also be useful in treatment of conduits that are, for example, vertical, horizontal, slanted, or directional, and for pipelines and other conduits. The present invention may also be useful in, for example, post-drilling or post-completion clean-out of sand or fluid to prepare a well for testing or production, testing to assess the productive capacity of a well, and work-over of a producing well or pipeline to restore productive capacity. 
         [0179]    The present invention may also be useful in, for example, static pressure and draw-down well servicing, or successive static pressure and draw-down. Static pressure well servicing is performed by equalizing jetting rate with pumping rates or by top-filling the well, in either case to maintain fluid balance, resulting in no reservoir inflow to the wellbore during clean-out. Draw-down well servicing is achieved through pumping more fluid than jetting, and results in a net removal of fluids from the well. 
         [0180]    The present invention may also be useful in, for example, injecting chemicals that limit or enhance production from portions of the well using a segregated injection string or power fluid jetting fraction, and then pumping the chemicals out using the jet pump function. The present invention may also be useful in, for example, pumping from sections of a vertical or horizontal well, optionally with isolation provided by, for example, packers, to enhance fluid recovery from portions of a well wherein incremental draw-down is appropriate. 
         [0181]    System 
         [0182]      FIG. 1  depicts a system including one embodiment of a multi-string tubing system and jet pump for removing wellbore fluid  10  from a subsurface or subterranean hydrocarbon bearing formation  20  via a wellbore  30 . The wellbore fluid  10  may include entrained solids. A pressure pump truck  40  includes a surface pump  50  and a fluid storage tank  60 . Power fluid  70  is conveyed to a coiled tubing unit  80 . The power fluid  70  is typically either water- or hydrocarbon-based. The coiled tubing unit  80  includes a coiled tubing reel  90  with a spoolable multi-string tubing system (SMTS)  100 . The SMTS  100  may include two or more conduits, for example a supply tubing string  110  and a return tubing string  120 . 
         [0183]    Power fluid  70  flows in the supply tubing string  110  of the SMTS  100 . The SMTS  100  is deployed using a coiled tubing injector  130  with injector blocks adapted to run the SMTS  100 . The SMTS  100  is positioned through a wellhead  140  and into the wellbore  30 . The downhole end of the SMTS  100  includes a jet pump  150  powered by power fluid  70 , which is deployed into the wellbore  30  to remove wellbore fluid  10 . Inside the jet pump  150 , wellbore fluid  10  is combined with the power fluid  70 ; this combination is return fluid  160 . 
         [0184]    Return fluid  160  is pumped to the surface via the return tubing string  120  in the SMTS  100 . The return fluid  160  exits the coiled tubing reel  90  and is conveyed to a return tank  170 . Any gas from the wellbore  30  flows into a gas line  180 . The gas line  180  may be shut in or opened to gas flow during use of the jet pump  150 . 
         [0185]    Jet Pump 
         [0186]      FIG. 2  depicts an embodiment of a jet pump  150  for use with a SMTS  100  wherein the SMTS  100  includes a supply tubing string  110  and a return tubing string  120 . Connectors  190  connect a power fluid inlet  200  and the supply tubing string  110 , and a return fluid outlet  210  and the return tubing string  120 . The connectors  190  may be threaded, welded, or otherwise adapted to connect the jet pump body  220  with the supply tubing string  110  and the return tubing string  120 . The jet pump body  220  may, for example, have a unibody design (as illustrated), or be a dual barrel jet pump body  230  ( FIG. 16 ). 
         [0187]    Power fluid  70  flows through the power fluid inlet  200  into the jet pump body  220 , causing wellbore fluid  10  to flow into the jet pump body  220  through a jet pump intake  240 . Power fluid  70  and wellbore fluid  10  are combined as return fluid  160  in the jet pump body  220 . The return fluid  160  flows from the jet pump body  220  and into the return fluid outlet  210 . 
         [0188]    The jet pump body  220  may be adapted to direct power fluid  70  or return fluid  160  to a jetting sub  250 . Jetting fluid  260  flows out of a jetting nozzle  270 . Jetting fluid  260  is any fluid, for example power fluid  70  or return fluid  160 , that flows to the jetting sub  250 . 
         [0189]    SMTS 
         [0190]      FIG. 3  depicts an embodiment of the SMTS  100  for use with the jet pump  150  of  FIG. 2 . The supply tubing string  110  and the return tubing string  120  are encapsulated in a single bundle  280  to facilitate deployment or retrieval with a single running operation using a conventional coiled tubing unit with modified injector chains. The supply tubing string  110  and the return tubing string  120  are substantially parallel with one another. As illustrated by  FIG. 3 , the supply tubing string  110  and the return tubing string  120  are laterally disposed with respect to one another. The tubing string  110  and the return tubing string  120  may abut along their long axes or, as illustrated in  FIG. 3 , may be positioned apart from one another. 
         [0191]    Jet Pump Body 
         [0192]      FIG. 4  is a cross-section of one embodiment of the jet pump body  220  of  FIG. 2 . Power fluid  70  flows into a venturi nozzle  290 . While flowing through the venturi nozzle  290 , the power fluid  70  flows past a venturi gap  300  between the venturi nozzle  290  and a diffuser  310 , creating a low pressure condition at the venturi gap  300 . The low pressure condition causes wellbore fluid  10  to flow into a jet pump intake  240  and to the venturi gap  300 . Upon entering the venturi gap  300  and the diffuser  310 , wellbore fluid  10  combines with power fluid  70 , forming return fluid  160 . At least a portion of the return fluid  160  flows through a return tube  320  and into a return fluid outlet  210 . At least a portion of the return fluid  160  flows through the return tube  320  into the jetting sub  250 . A check valve  330  may prevent backflow when flowing power fluid  70  is not flowing through the venturi nozzle  290 , as may occur, for example, when the jet pump  150  ( FIG. 2 ) is in a jetting mode (see  FIG. 23 ). 
         [0193]      FIG. 5  is a cross-section one embodiment of the jet pump body  220  of  FIG. 2  wherein at least a portion of the power fluid  70  is directed to a jetting sub  250  from the power fluid inlet  200 . 
         [0194]      FIG. 6  is a cross-section of one embodiment of the jet pump body  220  of  FIG. 2  wherein at least a portion of the power fluid  70  flows along a jetting flow passage  340 . A jetting inlet  350  to the jetting flow passage  340  is situated in the venturi inlet  360  upstream of the venturi nozzle  290  and includes a particulate screen  370 . The jetting sub  250  is in fluid communication with the jetting flow passage  340 . 
         [0195]    Jet Pump with Auxiliary Tubing String 
         [0196]      FIGS. 7 and 8  depict an embodiment of a jet pump  150  for use with a SMTS  100  wherein the SMTS  100  includes an auxiliary tubing string  380 . A supply tubing string  110 , a return tubing string  120 , and the auxiliary tubing string  380  are encapsulated in a single bundle  280 . The supply tubing string  110 , the return tubing string  120 , and the auxiliary tubing string  380  are all substantially parallel with, and laterally disposed with respect to, one another. A jetting sub  250  is in fluid communication with the auxiliary tubing string  380 . Jetting fluid  260  flows from the auxiliary tubing string  380  to the jetting sub  250 . 
         [0197]      FIG. 9  is a cross-section of the jet pump body  220  of  FIG. 7  wherein an auxiliary tubing string  380  is in fluid communication with a jetting flow passage  340  through which jetting fluid  260  flows to the jetting sub  250 . 
         [0198]    Jet Pump with Data-Sensing Sub 
         [0199]      FIGS. 10 and 11  depict an embodiment of a jet pump  150  for use with a SMTS  100  wherein the SMTS  100  includes a communications line  390 . A supply tubing string  110 , a return tubing string  120 , and the communications line  390  are encapsulated in a single bundle  280 . The supply tubing string  110 , the return tubing string  120 , and the communications line  390  are all substantially parallel with, and laterally disposed with respect to, one another. The communications line  390  may be a small tubing string or an electrical conductor, include, for example, hydraulic, electric, or fiber optic communication means. A communications connector  400  operatively connects a data-sensing sub  410  with the communications line  390 . The communications connector  400  may be threaded, welded, or otherwise adapted to operatively connect the data-sensing sub  410  with the communications line  390 . When data such as bottomhole pressure, temperature, or both are required, data from the data-sensing sub  410  is received at the surface electronically or through pressure communication. Examples of data that the data-sensing sub  410  may be adapted to receive include temperature and pressure. 
         [0200]    Jet Pump with Jetting Flow Valve 
         [0201]      FIG. 12  is a cross-section of a jet pump body  220  wherein power fluid  70  enters the jet pump body  220  through the power fluid inlet  200 . At least a portion of the power fluid  70  flows along a jetting flow passage  340  (wherein it is referred to as jetting fluid  260 ). A jetting flow valve  420  is located along the jetting flow passage  340  and is adapted to selectively obstruct flow of the jetting fluid  260  through the jetting flow passage  340 . The jetting flow valve  420  is operatively connected with a communications line  390 . Subject to the state of the jetting flow valve  420 , the jetting flow passage  340  provides fluid communication between a power fluid inlet  200  and the jetting sub  250 . 
         [0202]    Jet Pump with Jetting Flow Valve and Data-Sensing Sub 
         [0203]      FIGS. 13 ,  14 , and  15  depict an embodiment of a jet pump  150  for use with a SMTS  100  wherein the SMTS  100  includes a first communications line  430  and a second communications line  440 . A supply tubing string  110 , a return tubing string  120 , the first communications line  430 , and the second communications line  440  are encapsulated in a single bundle  280 . The supply tubing string  110 , the return tubing string  120 , the first communications line  430 , and the second communications line  440  are all substantially parallel with one another. The first communications line  430  and the second communications line  440  may each be a small tubing string or an electrical conductor, include, for example, hydraulic, electric, or fiber optic communication means. A data-sensing sub  410  is operatively connected with the first communications line  430 . A jetting flow valve  420  is operatively connected with the second communications line  440 . 
         [0204]    Dual-Barrel Jet Pump Body 
         [0205]      FIG. 16  is an embodiment of a jet pump  150  including a dual-barrel jet pump body  230 . Internally, the dual-barrel jet pump body  230  functions in a similar manner to a jet pump body  220  ( FIG. 2 ) with a unibody design. 
         [0206]    Jetting Sub 
         [0207]      FIG. 17  depicts a jetting sub  250  for a jet pump  150  ( FIG. 2 ), with a jetting nozzle  270 . Jetting fluid  260  flows from a jet pump body  220 , through the jetting sub  250 , and out the jetting nozzle  270 . 
         [0208]      FIG. 18  depicts a jetting sub  250  for a jet pump  150  ( FIG. 2 ), having. The upper flow control choke  450  is sized to limit flow of jetting fluid  260  that may otherwise occur if the jetting nozzle  270  washes out, for example due to sand erosion. 
         [0209]      FIG. 19  depicts a jetting sub  250  for a jet pump  150  ( FIG. 2 ) wherein access by jetting fluid  260  to the jetting nozzle  270  is subject to a back-pressure valve  460 . The back-pressure valve  460  may include, for example, a ball  470 , a spring  480 , and a seat  490 . The back-pressure valve  460  may be adapted to open at a selected back-pressure setting. The back-pressure setting is selected by selecting a spring rate, distance, or combination thereof, of the spring  480 . When fluid pressure equal to or greater than the back-pressure setting is applied, the spring  480  is compressed and jetting fluid  260  flows through the jetting nozzle  270 . 
         [0210]    Jetting Nozzle 
         [0211]      FIG. 20  depicts a jetting nozzle  270  for a jetting sub  250  wherein jetting fluid  260  flows through a converging jetting passage  500  and a diverging jetting passage  510 . The converging jetting passage  500  may be present on a converging jetting passage insert  520 . The diverging jetting passage  510  may be present on a disposable nose  525 . Each of the converging jetting passage insert  520  and the disposable nose  525  may be reversibly connected with the jetting nozzle  270 , for example by a threaded connection. The converging jetting passage  500  and the diverging jetting passage  510  form a jetting pinch  530 . The jetting pinch  530  is sized to provide back-pressure for the jetting nozzle  270 . When jetting fluid  260  flows from the jetting nozzle  270 , particulates  535 , for example from a wellbore obstruction  570  ( FIG. 23 ), may eddy in proximity to the jetting nozzle  270 . Particulates  535  eddy in proximity to the diverging jetting passage  510  preferentially to the converging jetting passage  500  and the jetting pinch  530 , protecting the converging jetting passage  500  and the jetting pinch  530  from damage. If the disposable nose  525  is damaged by the particulates  535 , it may be replaced. 
         [0212]      FIG. 21  depicts a jetting nozzle  270  for a jetting sub  250 , wherein an abrasion-resistant elastomeric insert  540  is located radially outward from the diverging jetting passage  510 . The abrasion-resistant elastomeric insert  540  is more resistant to damage caused by particulates than the diverging jetting passage  510 . 
         [0213]    Jet Pump Intake 
         [0214]      FIG. 22  depicts a jet pump intake  240  for a jet pump  150 , which includes slots  550 . An opening dimension  560  of the slots  550  is selected based on the size of a venturi gap  300  in the jet pump body  220  ( FIG. 4 ) and the size of any material in the wellbore  30  which may enter the jet pump intake  240 . The opening dimension  560  is selected to be large enough to admit most particulates that will be found in a wellbore  30  but small enough to prevent intake of particulates that are large enough to plug the venturi gap  300 . 
         [0215]    Method of Using a Jet Pump 
         [0216]      FIG. 23  illustrates one embodiment of a method of using a jet pump  150 . The jet pump  150  includes a jet pump body  220 , a jetting sub  250  and a jet pump intake  240 . The jetting sub  250  includes a jetting nozzle  270 . Wellbore fluid  10  may be pumped to the surface by the jet pump  150  (fluid cleanout mode). If a wellbore obstruction  570  (for example a sand bridge) is present, suction at the jet pump intake  240  may cease and jetting fluid  260  may be emitted from the jetting nozzle  270  to disperse the wellbore obstruction  570  (jetting mode). Once the wellbore obstruction  570  is sufficiently dispersed, emission of jetting fluid  260  from the jetting nozzle  270  may cease and pumping of wellbore fluid  10  to the surface by the jet pump  150  may be resumed. 
         [0217]    Changing from the fluid cleanout mode to the jetting mode may be accomplished by reconfiguring a return tubing string  120  such that power fluid  70  is supplied to the jet pump body  220  through both a supply tubing string  110  and the return tubing string  120 . The same change may be accomplished by blocking the return tubing string  120 . Changing from the jetting mode to the fluid cleanout mode may be accomplished by reconfiguring the return tubing string  120  to remove return fluid  160 . A jet pump  150  having a jet pump body  220 , for example, as in  FIG. 4 , or as in  FIG. 5  wherein the jetting sub  250  includes a back-pressure valve  460  ( FIG. 19 ), is suitable for use in the method of  FIG. 23 . 
         [0218]      FIG. 24  illustrates a further embodiment of a method of using the jet pump  150  of  FIG. 23 . Wellbore fluid  10  may be pumped to the surface by the jet pump  150  (fluid cleanout mode). If a wellbore obstruction  570  (for example a sand bridge) is present, jetting fluid  260  may be emitted from the jetting nozzle  270  to disperse the wellbore obstruction  570  (jetting and fluid cleanout mode). Once the wellbore obstruction  570  is sufficiently dispersed, emission of jetting fluid  260  from the jetting nozzle  270  may cease. 
         [0219]    Where the jet pump  150  includes a jet pump body  220  configured, for example, as in  FIG. 5  and wherein the jetting sub  250  includes a back-pressure valve  460  as in  FIG. 19 , changing from the fluid cleanout mode to the jetting and fluid cleanout mode may be accomplished by supplying power fluid  70  from a supply tubing string  110  at a selected fluid pressure, the selected fluid pressure being sufficient to compress a spring  480  ( FIG. 19 ), allowing jetting fluid  260  to flow through the jetting nozzle  270 . Changing from jetting and fluid cleanout mode to the fluid cleanout mode may be accomplished by lowering the fluid pressure at which power fluid  70  is supplied from a supply tubing string  110  below a back-pressure setting of the spring  480 , such that the spring  480  is no longer compressed, and jetting fluid  260  is prevented from flowing through the jetting nozzle  270 . 
         [0220]      FIG. 25  illustrates a further embodiment of a method of using the jet pump  150  of  FIG. 23 . Wellbore fluid  10  may be pumped to the surface by the jet pump  150  while jetting fluid  260  flows from the jetting nozzle  270 . A jet pump  150  having a jet pump body  220  as in, for example,  FIG. 5  or  6  is suitable for use in the method of  FIG. 25 . 
         [0221]    Method of Using a Jet Pump Including an Auxiliary Tubing String 
         [0222]      FIG. 26  illustrates a further embodiment of a method of using a jet pump  150 . The jet pump  150  further includes an auxiliary tubing string  380  in fluid communication with the jetting sub  250 , and may have a jet pump body  220  configured, for example, as in  FIG. 9 . Similarly to the method of  FIG. 23 , the jet pump  150  may be used in fluid cleanout mode or jetting mode. Changing from the fluid cleanout mode to the jetting mode may be accomplished by flowing jetting fluid  260  through the auxiliary tubing string  380 , and reducing or removing fluid pressure from a supply tubing string  110 . Changing from the jetting mode to the fluid cleanout mode may be accomplished by ceasing to flow jetting fluid  260  through the auxiliary tubing string  380  and providing power fluid  70  to the supply tubing string  110  at a sufficient fluid pressure to generate suction at the jet pump intake  240 . 
         [0223]      FIG. 27  illustrates a further embodiment of a method of using the jet pump  150  of  FIG. 26 . Similarly to the method of  FIG. 24 , the jet pump  150  may be used in the fluid cleanout mode or in fluid cleanout and jetting mode. Changing from the fluid cleanout mode to jetting and fluid cleanout mode may be accomplished by flowing jetting fluid  260  through the auxiliary tubing string  380 . Changing from the jetting and fluid cleanout mode to the fluid cleanout mode may be accomplished by ceasing to flow jetting fluid  260  through the auxiliary tubing string  380 . 
         [0224]      FIG. 28  illustrates a further embodiment of a method of using the jet pump  150  of  FIG. 26 . Wellbore fluid  10  may be pumped to the surface by the jet pump  150  while jetting fluid  260  continuously flows from the jetting nozzle  270 . 
         [0225]    Method of Using a Jet Pump Including a Jetting Flow Valve 
         [0226]      FIG. 29  illustrates a further embodiment of a method of using a jet pump  150 . The jet pump  150  further includes a communications line  390  and may have a jet pump body  220  configured, for example as that in  FIG. 12 , wherein the communications line  390  is in operative communication with a jetting flow valve  420  located along a jetting flow passage  340  ( FIG. 12 ). Similarly to the method of  FIG. 23 , the jet pump  150  may be used in fluid cleanout mode or jetting mode. Changing from the fluid cleanout mode to the jetting mode may be accomplished by causing the jetting flow valve  420  to allow fluid communication between a supply tubing string  110  and the jetting sub  250  ( FIG. 12 ), and reconfiguring a return tubing string  120  such that power fluid  70  is supplied to the jet pump body  220  through both the supply tubing string  110  and the return tubing string  120 . The same change may be accomplished by blocking the return tubing string  120 . Changing from the jetting mode to the fluid cleanout mode may be accomplished by reconfiguring the return tubing string  120  to remove wellbore fluid  10  and by causing the jetting flow valve  420  to prevent fluid communication between the supply tubing string  110  and the jetting sub  250  ( FIG. 12 ). 
         [0227]      FIG. 30  illustrates a further embodiment of a method of using the jet pump  150  of  FIG. 29 . Similarly to the method of  FIG. 24 , the jet pump  150  may be used in the fluid cleanout mode or fluid cleanout and jetting mode. Changing from the fluid cleanout mode to jetting and fluid cleanout mode may be accomplished by causing the jetting flow valve  420  to allow fluid communication between a supply tubing string  110  and the jetting sub  250  ( FIG. 12 ). 
         [0228]      FIG. 31  illustrates a further embodiment of a method of using the jet pump  150  of  FIG. 29 . Wellbore fluid  10  may be pumped to the surface by the jet pump  150  while jetting fluid  260  continuously flows from the jetting nozzle  270 . 
         [0229]    Method of Using a Jet Pump Including a Jetting Flow Valve and a Data-Sensing Sub 
         [0230]      FIG. 32  illustrates a further embodiment of a method of using a jet pump  150 . The jet pump  150  further includes a first communications line  430  and a second communications line  440 , and may have a jet pump body  220  configured, for example as that in  FIGS. 13 and 15 , wherein a data-sensing sub  410  is operatively connected with the first communications line  430 , and a jetting flow valve  420  inside the jet pump body  220  is operatively connected with the second communications line  440 . Similarly to the method of  FIG. 23 , the jet pump  150  may be used in the fluid cleanout mode or the jetting mode. Changing from the fluid cleanout mode to the jetting mode may be accomplished as in the method of  FIG. 29 , with reference to  FIG. 15  rather than to  FIG. 12 , and with the additional step of receiving data returned from the data-sensing sub  410 . The data received from the data-sensing sub  410  may be relevant to selection of, for example, a mode of operation or a pressure at which to administer either power fluid  70  or jetting fluid  260 . 
         [0231]      FIG. 33  illustrates a further embodiment of a method of using the jet pump  150  of  FIG. 32 . Similarly to the method of  FIG. 24 , the jet pump  150  may be used in fluid cleanout mode or fluid cleanout and jetting mode. Changing from the fluid cleanout mode to the fluid cleanout and jetting mode may be accomplished as in the method of  FIG. 30 , with reference to  FIG. 15  rather than to  FIG. 12 , and with the additional step of receiving data returned from the data-sensing sub  410 . The data received from the data-sensing sub  410  may be relevant to selection of, for example, a mode of operation or a pressure at which to administer either power fluid  70  or jetting fluid  260 . 
         [0232]      FIG. 34  illustrates a further embodiment of a method of using the jet pump  150  of  FIG. 32 . Wellbore fluid  10  may be pumped to the surface by the jet pump  150  while jetting fluid  260  continuously flows from the jetting nozzle  270 . The data-sensing sub  410  operatively connected to a second communications line  440  receives data from the wellbore  30 . 
         [0233]    A data-sensing sub  410  operatively connected to a communications line  390  may be incorporated into the jet pump  150  of any of the methods of  FIGS. 23-31  and used in an analogous way to the data-sensing sub  410  of the jet pump  150  of  FIGS. 32-34 . 
         [0234]    Jetting Sub with Lateral Jetting Ports 
         [0235]      FIG. 35  depicts a jetting sub  250  for a jet pump  150  ( FIG. 2 ), having one or more lateral jetting ports  580 . The lateral jetting ports  580  may oriented at an angle  590  relative to the longitudinal axis of the jetting sub  250 . The angle  590  may be between, about 0 degrees and about +/−90 degrees. The angle  590  may be, for example, −85, −75, −60, −45, −30, −15, 0, +15, +30, +45, +60, +75, or +85. An extension member (not shown) may be present to allow the lateral jetting ports to direct jetting fluid  260  vertically uphole (−90 degrees) or vertically downhole (+90 degrees). In addition, the lateral jetting ports  580  may extend radially or they may be skewed relative to the radial axis of the jetting sub  250  with the same wide range of angles as in the longitudinal axis of the jetting sub  250 . 
         [0236]    When jetting fluid  260  flows from the jetting nozzle  270 , it also flows from the lateral jetting ports  580 . Jetting fluid  260  flowing from the lateral jetting ports  580  may more effectively entrain particulates in wellbore fluid  10  ( FIG. 23 ), for example those present in a wellbore obstruction  570  ( FIG. 23 ), which may facilitate removal of wellbore fluid  10  ( FIG. 23 ) from the wellbore  30  ( FIG. 23 ) by the jet pump intake  240  ( FIG. 23 ). 
         [0237]      FIG. 36  depicts a jetting sub  250  for a jet pump  150  ( FIG. 2 ), having an upper flow control choke  450  and one or more lateral jetting ports  580 . 
         [0238]      FIG. 37  depicts a jetting sub  250  for a jet pump  150  ( FIG. 2 ), having one or more lateral jetting ports  580 , and wherein access by jetting fluid  260  to the jetting nozzle  270  is subject to a back-pressure valve  460 . 
         [0239]    In the preceding description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the embodiments of the invention. However, it will be apparent to one skilled in the art that these specific details are not required in order to practice the invention. 
         [0240]    The above-described embodiments of the invention are intended to be examples only. Alterations, modifications and variations can be effected to the particular embodiments by those of skill in the art without departing from the scope of the invention, which is defined solely by the claims appended hereto.