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CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a United States national phase application which claims priority to International Application No. PCT/US2012/068983, filed Dec. 11, 2012, the entire disclosure of which is hereby incorporated herein by reference. 
     BACKGROUND 
     Technical Field 
     The present invention relates to filtering undesirable particulates from hydrocarbon production at a subterranean location in a well. In the industry, this field is sometimes referred to as “sand control.” 
     Background Art 
     Screens and gravel packing are commonly used as a sand-control method to prevent production of formation sand or other fines from a poorly consolidated subterranean formation. In this context, “fines” are tiny particles that have a tendency to flow through the formation with the production of hydrocarbon. The fines have a tendency to plug small pore spaces in the formation and block the flow of oil. As all the hydrocarbon is flowing from a relatively large region around the wellbore toward a relatively small area around the wellbore, the fines have a tendency to become densely packed and screen out or plug the area immediately around the wellbore. Moreover, the fines are highly abrasive and can be damaging to pumping and oilfield other equipment and operations. 
     In one common type of gravel packing, a mechanical screen is placed in the wellbore and the surrounding annulus is packed with a particulate of a larger specific size designed to prevent the passage of formation sand or other fines. 
     For sand control applications screens assemblies of various sizes and shapes are used either alone or surrounding by a gravel pack. In a common application configuration a perforated pipe with screen material is connected to a production string installed in the well. Fine gravel material will be flowed (packed) around the screen causing hydrocarbon production to first flow through the gravel pack and then the screen before entering the perforated pipe of the production string. 
     While these prior filter systems function adequately they can be damaged during installation and use. In addition, problems are encountered with this type of gravel packing in controlling the distribution of particulate around the screen. When voids are present in the gravel pack, the unprotected areas of the screen at the void can be damaged or the area screened out by excessive flow. 
     SUMMARY OF THE INVENTIONS 
     In the proposed sand control filter system, gravel and screen material are assembled together in one system and them placed in the well at a subterranean location. 
     According to one aspect of the present invention, a non-porous tubular member is filled with gravel and screen material and the well is configured to cause the produced hydrocarbon flow to pass through the tubular member. 
     According to another aspect the present invention, filter zones of gravel of decreasing sizes are included in the tubular member. These gravel zones protect screen material filters in the tubular member. 
     According to a further aspect of the present invention, the tubular member in the form of a packer that engages the wall of the wellbore to force flow through the filtering material. Indeed, in one embodiment the packer is a swellable packer. 
     The simple design of “Screen Packer” will be beneficial, in both vertical and horizontal well completion in unconsolidated reservoirs, for sand free production. This can accommodate shorter as well as longer intervals of producing zones. Successful completion using “Screen Packer” could be achieved in a very short period of time. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawing is incorporated into and forms a part of the specification to illustrate at least one embodiment and example of the present invention. Together with the written description, the drawing serves to explain the principles of the invention. The drawing is only for the purpose of illustrating at least one preferred example of at least one embodiment of the invention and is not to be construed as limiting the invention to only the illustrated and described example or examples. The various advantages and features of the various embodiments of the present invention will be apparent from a consideration of the drawing in which: 
         FIG. 1  is a partial section view of a well configuration of the present invention in the run-in configuration illustrated in longitudinal section; 
         FIG. 2  is a partial view of a well configuration of the present invention in the production configuration illustrated in longitudinal section; 
         FIG. 3  is an enlarged sectional view taken on line  3 - 3  in  FIG. 1  looking in the direction of the arrows of the screen packer assembly of the present invention in the run-in configuration; 
         FIG. 4  is an enlarged sectional view taken on line  4 - 4  in  FIG. 2  looking in the direction of the arrows of the screen packer assembly of the present invention the production configuration; 
         FIG. 5  is an enlarged sectional view taken on line  5 - 5  in  FIG. 3  looking in the direction of the arrows of the screen packer assembly of the present invention in the run-in configuration; 
         FIG. 6  is an enlarged sectional view taken on line  6 - 6  in  FIG. 4  looking in the direction of the arrows of the screen packer assembly of the present invention the production configuration; and 
         FIG. 7  is an enlarged sectional view similar  FIG. 6  illustrating an alternative embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     The present invention provides an improved apparatus and method for filtering hydrocarbons at a subterranean location. The present invention is particularly applicability to using a gravel pack-screen assembly as a filter medium for hydrocarbons being produced from a subterranean formation. 
     Referring more particularly to the drawings, which are not intended to be to scale or in proportion, wherein, like reference characters are used throughout the various figures to refer to like or corresponding parts, there is shown in  FIG. 1 , one embodiment of a well screen-packer configuration embodying principles of the present invention that is schematically illustrated and generally designated by reference numeral  10 . In the illustrated embodiment, a wellbore  12  extends through various earth strata. Wellbore  12  has a substantially vertical section  14 , the upper portion of which has installed therein a casing string  16  that is cemented within the wellbore  12 . Wellbore  12 , also, has a substantially horizontally extending portion  18  that extends through one or more hydrocarbon bearing subterranean formations  20 . In the exemplary embodiment, the wellbore  12  is lined with a casing string. The casing string may then be cemented to the formation. There are a number of factors that go into the decision of whether to case the wellbore  12  and whether to cement the casing to the formation. A person of ordinary skill in the art should know whether the wellbore  12  needs to be cased. In most cases, it will be beneficial to do so. As illustrated, the substantially horizontal section  18  of wellbore  12  is cased and according to the principles of the present invention would apply as well to an open hole completion. 
     Positioned within wellbore  12 , and extending from the surface, is a tubing string  22 . Tubing string  22  provides a conduit for formation fluids to travel from the formation  20  the surface. Positioned within tubing string  22  is a plurality of longitudinally spaced sand control packer-screen assemblies  24 . The sand control packer screen assemblies  24  are shown in  FIG. 1  in a running or un-extended configuration. 
     Referring now to  FIG. 2 , there is depicted well system of  FIG. 1  with the sand control packer screen assemblies  24  in their production or expanded configuration. As explained in greater detail below, each of the depicted sand control packer-screen assemblies  22  has a base pipe  28 , a filter medium  30  (not illustrated in  FIG. 1 or 2 ) disposed around the base pipe, a sleeve valve (not illustrated in  FIG. 1 or 2 ), and a swellable material layer  26  on the exterior. In general, the swellable material layer is on the exterior or around the circumference of the assembly  22 . Also, as will be described in greater detail, hereinafter, the filter medium  30  may comprise a plurality of gravel and screen filter elements arranged in series to filter hydrocarbon fluids, flowing through there through. In this configuration, when the swellable material  26  of assemblies  24  comes into contact with an activating fluid, such as, a hydrocarbon fluid, water or gas, the swellable material layer  26  radially expands to seal against the wall of the wellbore, whether it be cased or open hole. In this manner, the swellable material acts as a packer to pack off the annular space formed between the assembly  24  and the wellbore. It is envisioned, of course, that other packer configurations well known in the art could be utilized, including, for example, those having elastomeric packing elements and optional slip assemblies. 
     As used herein, a particle is characterized as swellable when it swells upon contact with an aqueous fluid (e.g., water), an oil-based fluid (e.g., oil) or a gas. Suitable swellable particles are described in the following references, each of which is incorporated by reference herein in its entirety: U.S. Pat. No. 3,385,367, U.S. Pat. No. 7,059,415, U.S. Pat. No. 7,578,347, U.S. Pat. App. No. 2004/0020662, U.S. Pat. App. No. 2007/0246225, U.S. Pat. App. No. 2009/0032260 and WO2005/116394. 
     Even though  FIGS. 1 and 2  depict a tubing string the includes only packer screen assemblies  24 , those skilled in the art were recognized that tubing string  22  may include a number of other tools and systems such as fluid flow control devices, communication systems, safety systems and the like. Also, tubing string  22  may be divided into a plurality of individuals using zonal isolation devices such as packers. Similar to the swellable material in packer screen assembly  24 , the zonal isolation devices may be made from materials that swell upon contact with a fluid such as an inorganic or organic fluid. Some exemplary fluids that may cause the zonal isolation devices to swell and isolate include water, gas and hydrocarbons. 
     In addition, although not illustrated in  FIGS. 1 and 2 , one or more production fractures could be formed in or along the horizontal wellbore portion  18 , using a variety of techniques. In one exemplary embodiment, a plurality of fractures is formed by using a hydra jetting tool, such as, that used in the SurgiFrac® fracturing service offered by Halliburton Energy Services, Inc. in Duncan, Okla. In this embodiment, the hydra jetting tool forms each fracture, one at a time. Each fracture may be formed by the following steps: (i) positioning the hydra jetting tool in the wellbore at the location where the fracture is to be formed, (ii) perforating the reservoir at the location where the fracture is to be formed, and (iii) injecting a fracture fluid into the perforation at sufficient pressure to form a fracture along the perforation. As those of ordinary skill in the art will appreciate, there are many variations on this embodiment. For example, fracture fluid can be simultaneously pumped down the annulus while it is being pumped out of the hydra jetting tool to initiate the fracture. Alternatively, the fracturing fluid may be pumped down the annulus and not through the hydra jetting tool to initiate and propagate the fracture. In this version, the hydra jetting tool primarily forms the perforations. 
     The fractures  210  may take a variety of geometries, but preferably the fractures extend transverse to the wellbore so that the fractures extend at a substantially right angle with respect to the wellbore longitudinal axis. In some embodiments, the fractures may be formed along natural fracture lines and may generally be parallel to one another. The fracture&#39;s shape, size and orientation can be determined by the orientation of the fluid nozzles and movement thereof. Using hydrajetting radially from a vertical wellbore, a transversely extending fracture can be formed and may extend from about 50 ft to about 1000 ft from the wellbore. 
     In addition, even though  FIGS. 1 and 2  illustrate the packer screen assemblies of the present invention in a horizontal section of the wellbore, it should be understood by those skilled in the art, that the sand control screen assemblies of the present invention are equally well-suited for use in deviated or vertical wellbores. Accordingly, it should be understood by those skilled in the art, that the use of directional terms such as above, below, upper, lower, upward, downward and the like, are used in relation to the illustrative embodiments as they are depicted in the figures, the upward direction being toward the top of the corresponding figures in a downhole direction being toward the bottom of the corresponding figure. Likewise, even though  FIGS. 1 and 2  depict the packer screen assemblies of the present invention in a wellbore having a single wellbore, it should be understood by those skilled in the art, that the packer screen assemblies of the present invention are equally well-suited for use in multilateral wellbores having a main wellbore in a plurality of branch wellbores. Turning now to  FIGS. 3-6 , the details of the illustrated embodiment of the packer screen assemblies  24  will be described. In  FIGS. 3 and 5  the packer screen assembly  24  is illustrated in this run configuration. In  FIGS. 4 and 6  the packer screen assembly is illustrated in its production configuration. In  FIG. 3 , swellable material  26  is illustrated prior to its being contacted by activating fluid. In this configuration, an annular space is present between the exterior of the swellable material  26  and the interior of the wellbore  18  allowing the assembly to be placed in the well. In  FIG. 4 , the swellable material  26  is shown after it has been contacted by an activating fluid with the material  26  expanded to pack off the annular space around the assembly  24 . 
     In  FIG. 6 , the flow of hydrocarbons “H” into the wellbore and through the assembly  24 , is illustrated by arrows. Hydrocarbons “H” flow into the wellbore  18  through a plurality of perforations “P”. As will be described in detail, the flow then filtered as it passes through the assembly  24  and thereafter enters the base pipe  28  through a valve  44 . 
     As illustrated, the packer screen assemblies  24  comprise a rigid tubular housing  40  mounted in spaced concentric relationship with the base pipe  28 . Swellable material  46  is mounted or bonded to the exterior of the tubular housing  40 . One or more supports  41  can be provided to connect housing  42  the base pipe  28 . In the illustrated embodiment supports  41  were in the form of spokes, however, it is envisioned that the supports  41  could be in the form of ribs, screens or porous annular walls. 
     Positioned inside of the housing  40  is a plurality of longitudinally spaced annular screens  50 ,  52 ,  54 ,  56 , and  58 . These screens are connected to the interior surface of the housing  40  and the exterior surface of the base pipe  28  in such a manner that flow around the edges is prevented. It is envisioned that welding clamps are other means could be utilized to attach the screens to the base pipe and housing. According to a particular feature, the present invention is envisioned that the screens  50 - 58  with vary in pore size with the coarsest screen. 
     In the illustrated embodiment a plurality of gravel packs  60 ,  62 ,  64  and  66  are positioned between the screens  50 - 58 . According to another particular feature of the present invention, the particulate material of the gravel packs  60 - 66  also vary in coarseness, with the gravel pack  60  being the coarsest and  66  being the finest. It is envisioned that by causing a hydrocarbon to flow successively through varying coarseness of screens and gravel packs that the filtering process will be more efficient. Is it believed that the coarser particulate contaminants in the flowing hydrocarbon will be filtered out in the initial portion of flow through the assembly  24  leaving the finer portions to be filtered out in the subsequent flow portions. This is also believed to prevent damage to the finer screens. 
     For example: 
     
       
         
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                   
                   
               
               
                   
                   
                   
                 Pack Sand 
                   
               
               
                   
                   
                 Smallest 
                 Smallest 
                 Screen 
               
               
                   
                 Pack Sand 
                 Gravel Size 
                 Diameter 
                 Gauge Size 
               
               
                   
                 US Mesh 
                 (US Mesh) 
                 (inches) 
                 (inches) 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                  8/12 
                 12 
                 0.0661 
                 0.061 
               
               
                   
                 10/16 
                 16 
                 0.0469 
                 0.042 
               
               
                   
                 12/20 
                 20 
                 0.331 
                 0.028 
               
               
                   
                 16/30 
                 30 
                 0.0232 
                 0.018 
               
               
                   
                 20/40 
                 40 
                 0.0165 
                 0.012 
               
               
                   
                 30/50 
                 50 
                 0.0117 
                 0.007 
               
               
                   
                 40/60 
                 60 
                 0.0098 
                 0.005 
               
               
                   
                 50/70 
                 70 
                 0.0083 
                 0.003 
               
               
                   
                   
               
             
          
         
       
     
     An enclosure  42  is formed by a conical shaped wall extending from the housing  40  to the exterior of the base pipe  28 . This enclosure is in fluid communication with the hydrocarbons following through the assembly  24  and encloses the valve  44 . 
     In another embodiment illustrated in  FIG. 7 , the enclosure  42   a  is formed within the housing  40 . 
     In the illustrated embodiment the valve  44  is a sleeve type valve that can be opened or closed to allow hydrocarbon liquids to selectively flow into the base pipe  28 . The sleeve valve  44  is of the type which can be opened or closed by accessing the base pipe in any manner well known in the art, such as, by use of a wireline, a service string, acoustic signal, RF signals, or the like. It is envisioned, of course, that this valve could be of a different type valve, such as, a ball, gate or other type valve. 
     In alternative embodiment, only screens  50  and  58  would be present and the gravel in the housing positioned between the two screens would be of uniform size and coarseness. 
     In a further embodiment, only screens  50  and  58  would be present in the gravel between the screens would be layered in decreasing coarseness as illustrated in  FIG. 6 . 
     In additional embodiments, with only the final screens  58  present in the housing  40 , could also have gravel of either uniform coarseness or layered in decreasing coarseness as described above. 
     In an even further embodiment, no screens would be present with the hydrocarbon filtered only by the gravel pack configuration as described above. 
     In any of the above described embodiments, the gravel layer or layers could be consolidated by a polymer, as is well known in the industry. 
     In any of the above described embodiments, the gravel could be coated by any materials that enhance filtering, such as the product available from Halliburton under the trademark “Sand Wedge.” 
     While compositions and methods are described in terms of “comprising,” “containing,” or “including” various components or steps, the compositions and methods, also, can “consist essentially of” or “consist of” the various components and steps. As used herein, the words “comprise,” “have,” “include,” and all grammatical variations thereof are each intended to have an open, non-limiting meaning that does not exclude additional elements or steps. 
     Therefore, the present inventions are well adapted to carry out the objects and attain the ends and advantages mentioned, as well as, those which are inherent therein. While the invention has been depicted, described, and is defined by reference to exemplary embodiments of the inventions, such a reference does not imply a limitation on the inventions, and no such limitation is to be inferred. The inventions are capable of considerable modification, alteration, and equivalents in form and function, as will occur to those ordinarily skilled in the pertinent arts and having the benefit of this disclosure. The depicted and described embodiments of the inventions are exemplary only, and are not exhaustive of the scope of the inventions. Consequently, the inventions are intended to be limited only by the spirit and scope of the appended claims, giving full cognizance to equivalents in all respects. 
     Also, the terms in the claims have their plain, ordinary meaning unless otherwise explicitly and clearly defined by the patentee. Moreover, the indefinite articles “a” or “an”, as used in the claims, are defined herein to mean one or more than one of the elements that it introduces. If there is any conflict in the usages of a word or term in this specification and one or more patent(s) or other documents that may be incorporated herein by reference, the definitions that are consistent with this specification should be adopted.

Summary:
Disclosed is a screen packer assembly for use in filtering hydrocarbons in a wellbore at a subterranean location. The screen-packer assembly connects in a production tubing string and packs off the wellbore and provides an axial filter path for hydrocarbons through the assembly and into the productions tubing.