Abstract:
The present invention provides a subsea apparatus for testing a hydraulic signature which has a fluid supply, a first pressure line coupled to the fluid supply, a second pressure line coupled to the fluid supply; and a pressure recording device operatively coupled to both the first pressure line and the second pressure line. A pressure recording device is capable of storing pre-determined pressure data representative of said pressure lines. The first pressure line functions at a lower pressure than the second pressure line while a pressure recording device records data to allow comparison of actual pressure data on the first and second pressure lines with said stored data.

Description:
FIELD OF INVENTION 
       [0001]    The present invention relates in general to the field of subsea equipment. 
       BACKGROUND ART 
       [0002]    The present invention relates to methods and systems for subsea energy extraction. In particular, the present invention relates to a hydraulic signature tester for assessment and monitoring of pressure systems. 
         [0003]    Various mechanisms have been employed to prevent failure of subsea components due in part to maintenance being performed normally on a time related basis rather than a condition based scenario. This not only adds needless costs, it also opens the system up for infant mortality of critical equipment due to needless repairs. 
         [0004]    Thus there exists a need for an apparatus that is capable of dynamically measuring fluid flow anomalies via pressure and time constraints during normal maintenance checks to fully analyze the condition of the equipment to determine if a repair is required. After repairs, the system of a preferred embodiment of the invention is used not only to confirm the quality of the repair, but also provide a new birth certificate for the repaired equipment to be used as a base line for future tests. In the case of new equipment, analysis with this system would be the initial birth certificate. 
       SUMMARY OF THE INVENTION 
       [0005]    The present invention provides a subsea apparatus for monitoring and testing of a hydraulic signature having a fluid supply, a first pressure line coupled to the fluid supply, a second pressure line coupled to the fluid supply; and a pressure recording device operatively coupled to both the first pressure line and the second pressure line. Storage of pre-determined pressure data is representative of the aforementioned pressure lines. The first pressure line can function at a lower pressure than the second pressure line. A pressure recording device records data to allow comparison of actual pressure data on said lines with said stored data. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    Further benefits and advantages of the present invention will become more apparent from the following description of various embodiments that are given by way of example with reference to the accompanying drawings: 
           [0007]      FIG. 1  represents a schematic view of a hydraulic signature tester according to a preferred embodiment of the invention. 
       
    
    
     DESCRIPTION OF THE INVENTION 
       [0008]    While the making and using of various embodiments of the present invention are discussed in detail below, it should be appreciated that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed herein are merely illustrative of specific ways to make and use the invention and do not delimit the scope of the invention. 
         [0009]    To facilitate the understanding of this invention, a number of terms are defined below. Terms defined herein have meanings as commonly understood by a person of ordinary skill in the areas relevant to the present invention. Terms such as “a”, “an” and “the” are not intended to refer to only a singular entity, but include the general class of which a specific example may be used for illustration. The terminology herein is used to describe specific embodiments of the invention, but their usage does not delimit the invention, except as outlined in the claims. 
         [0010]    Referring now to the figure,  FIG. 1  illustrates a schematic view of an apparatus for testing a hydraulic signature  10 . Apparatus for testing a hydraulic signature  10  includes fluid supply  12 , first pressure line  14 , second pressure line  16 , and pressure recording device  18 . Pressure recording device  18  couples to first pressure line  14  and second pressure line  16 . First pressure line  14  functions at a lower pressure than second pressure line  16 . Pressure recording device  18  records data to allow interpretation of both real time and theoretical pressure rates. As pressurized fluid is conveyed from a source such as fluid supply  12 , after passing through optional valves, it is dispensed into first pressure line  14  and second pressure line  16 . First pressure line  14  is intended to withstand lower pressures. Second pressure line  16  is intended to withstand higher pressures. 
         [0011]    First pressure line  14  ultimately conveys lower pressure readings into pressure recording device  18 . Second pressure line  16  also ultimately conveys a pressure reading into pressure recording device  18 . Pressure recording device  18  receives pressure inputs from first pressure line  14  and second pressure line  16  and compares pressure values received to theoretical pressure values developed through lab testing in various conditions, or through calculation. As pressure recording device  18  monitors real time pressures, it compares them to numerous inputs. Pressure recording device  18  can also monitor real time pressures when coupled to other systems, such as a blow out “BOP” preventer. After pressure recording device  18  has received pressure values, pressure may be relieved from first pressure line  14  and second pressure line  16 . First pressure line  14  may release pressure via relief valve  24 . Second pressure line  16  may release pressure via relief valve  26 . A first pressure gauge  20  operatively couples to first pressure line  14  to provide real time pressure, second pressure gauge  22  operatively couples to second pressure line  16  to provide real time pressure. 
         [0012]    In certain embodiments pressure gauge  20  may operatively associate with first pressure line  14 . Additionally, pressure gauge  22  may operatively associate with second pressure line  16 . First pressure line  14  may also include a relief mechanism  24  for releasing pressure from first pressure line  14 . Second pressure line  16  may also include a relief mechanism  26  for releasing pressure from second pressure line  16 . 
         [0013]    Regulating mechanism  28  may be operatively disposed between fluid supply  12  and first pressure line  14 . Similarly, regulating mechanism  28  may be operatively disposed between fluid supply  12  and second pressure line  16 . Transducer  30 , or similar communicating device, may operatively couple to first pressure line  14 , second pressure line  16 , or both lines to transmit pressure readings to an offsite source. 
         [0014]    First pressure line  14  may optionally include gauge saving valve  32  in order to control fluid flow. Additionally isolation valve  34  may be included to fully prevent fluid flow from reaching pressure recording device  18  in certain instances. Such instances arise when greater pressures are being transmitted to pressure recording device  18  via second pressure line  16 . In certain embodiments, an apparatus may be coupled to fluid supply  12  that maintains a constant fluid flow regardless of pressure and temperature variations. 
         [0015]    Additionally, numerous hydraulic valves may be installed about various portions of apparatus for testing a hydraulic signature  10 . For example, hydraulic valve  38  may be oriented to prevent pressure from over accumulating in first pressure line  14  and second pressure line  16 . Disposing hydraulic valve  38  in a position that allows pressure to enter first pressure line  14  and second pressure line  16  without overly accumulating, and allows for apparatus for testing a hydraulic signature  10  to be oriented in a steady state condition so that fluid entering from fluid supply  12  is constant throughout the system. In the event of an emergency, fluid contained within apparatus for testing a hydraulic signature  10  may be immediately released by opening hydraulic valve  30 . 
         [0016]    Similarly, valve  38  may be disposed prior in sequence for first pressure line  14  and second pressure line  16  to prevent fluid from entering first pressure line  14  and second pressure line  16 . In the event that bursts of high pressure or low pressure fluids are required to be implemented towards pressure recording device  18 , pressure may build after entering through fluid supply  12  and be subsequently released through valve  38 . An initial pressure gauge  39  may be disposed prior to regulating mechanism  28  in order to measure fluid pressure emanating from fluid supply  12 . Pressure gauge  40  may be disposed prior to entering valve  38  in order to measure pressure within the fluid line, to measure pressure exerted on hydraulic valve  38 , to determine pressure drop over first pressure line  14  and  15  , second pressure line  16 , and to compare real time pressure exertion of other pressure gauges. Additionally, a pressure reducing mechanism  41  may be disposed between regulating mechanism  28  and hydraulic valve  38 . 
         [0017]    In operation, fluid may accumulate within one or more fluid lines while leaving hydraulic valve  38  closed. After sufficient fluid has accumulated within one or more fluid lines and pressure has reached steady state, a reading may be taken from pressure gauge  40 . After a reading has been taken and assuming hydraulic valve  30  is in a closed position, valve  38  may be opened in order to allow fluid to reach first pressure line  14  and second pressure line  16 . As pressure is released into first pressure line  14  and second pressure line  16 , and assuming relief valve  24  and relief valve  26  are in closed positions, pressure recording device  18  may take real time pressure values. At the same time, pressure values are being recorded, in readings taken from first pressure gauge  20 , second pressure gauge  22 , and readings taken pressure gauge  40 , may all be compared to ensure that first pressure line  14  and second pressure line  16  are maintaining pressure. It is plausible that a small drop may be noted, but the drop should be minimal. Once pressure recording device  18  has performed its function, pressurized fluid held within first pressure line  14  and second pressure line  16  may be released via relief valve  24  and relief valve  26 . 
         [0018]    Regulating mechanism  28  may be implemented ahead of pressure gauge  40  in order to control the amount of fluid entering apparatus for testing a hydraulic signature  10 . Regulating mechanism  28  may be implemented in order to establish a laminar or steady state fluid flow entering apparatus  10 . Similarly regulating mechanism  28  may be implemented to control fluid input into apparatus for testing hydraulic signature  10 . 
         [0019]    In certain embodiments, pressure recording device  18  can be used to illustrate flow rate and pressure trends. For example, apparatus for testing hydraulic signature  10  can be initially employed to receive initial pressure values. Pressure values which are transmitted through apparatus for testing a hydraulic signature  10  may be initially recorded over a given time interval. Assuming that all components of apparatus for testing a hydraulic signature  10  are properly functioning and that an associated apparatus that it couples with is properly in line, apparatus for testing hydraulic signature  10  can be used to record pressure values. Apparatus for testing a hydraulic signature  10  can be used to record both steady state pressures and dynamic pressure rates over time periods. 
         [0020]    For example, if one desires to confirm that pressure is being maintained within the system or an associated apparatus, pressure may be ramped up to a desired pressure value in which hydraulic valve  30 , relief valve  24 , and relief valve  26  are closed. During this time period dual pressure recorder  18  may record such pressure values over a period of time. As pressure is increased within apparatus for testing a hydraulic signature  10  the increasing pressures may be recorded. Once a desired pressure is attained, pressure may cease being input and hydraulic valve  38  may be closed. For a specified period of time, pressure values should continue to be recorded via pressure recording device  18 . Pressure should be maintained in the system for a period of time so that one can determine if all components are properly functioning. These components can include various seals, sealing mechanisms, and transmission mechanisms. Pressure recording device  18  may then transmit data to another location such as an onboard computer or a processor, or offsite data center. In alternative embodiments, pressure recording device  18  may transmit data to an integrated onboard processor which in turn sends data wirelessly or through data lines to another processor or data storage device. Assuming that all components are properly functioning, these values may be recorded as “good” values. Once “good” values have been attained, such tests can be repeated to ensure that apparatus for testing a hydraulic signature  10  and associated components are properly functioning. As various tests are performed using apparatus for testing a hydraulic signature  10 , received pressure values can be recorded and compared to the initially obtained “good” values. In the event that subsequent pressure values do not result in substantially similar values to “good” values previously achieved, one may be alerted that an associated component may be near failure. An example, which is illustrative of such behavior, occurs when hydraulic valves are not fully sealing, perhaps due to additives jammed in their path. Another example which can allow for pressure lossage is pipe joints which can wear down due to excessive coupling or over torque. 
         [0021]    Additionally, apparatus for testing hydraulic signature  10  can dynamically compare hydraulic signatures. Hydraulic valve  30  may be opened to release pressure which will eventually reach an associated component. Pressure can reach an associated component most often via hydraulic valve  30 , vent  24 , vent  26 , or any additional pressure releasing mechanism associated with apparatus for testing hydraulic signature  10 . As pressure is disposed within apparatus for testing hydraulic signature  10  and measurements are taken over time, via pressure recording device  18  a hydraulic signature can be obtained. Assuming that all components are properly functioning, this hydraulic signature may be deemed a “good” hydraulic signature, without having to close any valves. Apparatus for testing hydraulic signature may continue to function over time while data is gathered via pressure recording device  18 . As pressure is gathered over a period of time and various flow rates are implemented according to the desired task, each subsequent flow rate can be compared to the initially achieved “good” hydraulic signature and various trends can be observed. In the event that sufficient wear and tear has occurred on various components of apparatus for testing hydraulic signature  10  or an associated component, and the hydraulic signature begins to shift, the associated component or valves contained within and/or associated with apparatus for testing hydraulic signature  10  can be closed ahead of time in order to prevent failure. 
         [0022]    In certain embodiments, predetermined hydraulic signatures can be loaded onto pressure recording device  18 . Once apparatus for testing hydraulic signature  10  begins functioning, existing flows and pressures can be compared to predetermined values and functionality of both apparatus for testing hydraulic signature  10  and/or associated components can be determined. In the event that flows and pressures are not attaining predetermined hydraulic signature levels, pressure and flow can be increased or decreased as necessary. For example, lower flow rate data can be preloaded onto pressure recording device  18  prior to starting apparatus for testing hydraulic signature  10 . Once apparatus for testing hydraulic signature  10  begins functioning any components that are improperly functioning would not ordinarily be picked up, but rather would be used to determine the initial hydraulic signature. Pre-stored data is beneficial because if a component of apparatus for testing hydraulic signature is not properly functioning at the onset, the failure can be immediately detected, the component repaired, and the machines functionality restored. 
         [0023]    Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification, but only by the claims.