Abstract: The invention relates to fluid sampling in a test that is used to determine physical and chemical characteristics of the fluids in a subterranean reservoir. The method reconstructs the entire pressure history of the fluid parcel that is captured in the fluid samplers during a test. Using this reconstructed pressure history of the samples, the quality of the samples, particularly, whether there is a phase change in the samples during the test, can be accurately quantified.

Abstract: Pressure-balanced accumulator apparatus for use in subsea operations is disclosed which comprises a housing and an accumulator within the housing at the first end of the housing. The accumulator has first and second chambers that are hermetically sealed from one another, with a pressurized gas in the first chamber and a pressurized fluid in the second chamber. A third chamber in the housing abuts the accumulator and contains silicon oil fluid. A movable piston is located within the housing proximate the second end of the housing. Ambient pressure is communicated to one end of the piston, and ambient pressure plus the pressure in the second chamber is communicated to the second end of the piston. The cross-sectional areas of the two ends of the piston are selected to optimize the pressure at which the piston begins to expel fluid from the second chamber.

Abstract: An apparatus for perforating wells has perforating charges and a means for retaining the perforating charges in a first array The first array has a first maximum cross sectional area; and means for expanding the perforating charges into a second three dimensional array The second array has a second maximum cross sectional area larger than the first maximum cross sectional area. Also an apparatus for perforating wells has a plurality of perforating charges and a means for retaining the perforating charges in a first array The first array has a primary axis and a first maximum cross sectional area and the perforating charges having firing directions oriented approximately perpendicular to the primary axis; and means for expanding the perforating charges into a second array, the second array has a second maximum cross sectional area larger than the first.

Abstract: A release device includes a first sub, a second sub, and a connector separably connecting the first and the second sub, wherein the connector includes a shear member disposed with the first sub and a collar connected between the second sub and the shear member.

Abstract: Pressure-balanced accumulator apparatus for use in subsea operations is disclosed which comprises a housing and an accumulator within the housing at the first end of the housing. The accumulator has first and second chambers that are hermetically sealed from one another, with a pressurized gas in the first chamber and a pressurized fluid in the second chamber. A third chamber in the housing abuts the accumulator and contains silicon oil fluid. A movable piston is located within the housing proximate the second end of the housing. Ambient pressure is communicated to one end of the piston, and ambient pressure plus the pressure in the second chamber is communicated to the second end of the piston. The cross-sectional areas of the two ends of the piston are selected to optimize the pressure at which the piston begins to expel fluid from the second chamber.

Abstract: The present application relates to a system and method for real-time monitoring and failure prediction of electrical submersible pumps. The design includes generating a failure prediction value with a management system by calculating a percentage change of the respective first measurement values and the corresponding user-supplied stable operating values, the failure prediction value representing likelihood of failure of the electrical submersible pump.

Abstract: A kickover tool for placing and extracting a valve in a mandrel having a hydraulic piston, a kickover arm portion mechanically connected to the hydraulic piston, the kickover arm portion being actuated by application of pressure to the piston. Upon full stoke of the piston, pressure is relieved, and measurement of the pressure relief can be used to indicate proper placement in a side pocket mandrel.

Abstract: A loading tube for use in a perforating gun is disclosed which eliminates the necessity for utilization of plastic jackets to restrain shaped charges. The loading tube comprises a first tubular member and an engagement structure in the first tubular member in which the primer ends of the shaped charges may be installed. These engagement structures may be a center plate or inner tubular members. In each of the disclosed embodiments, a detonating cord connects the primer ends of the shaped charges which are installed in the loading tube.

Abstract: A pothead connector for connecting a plurality of electrical cables to the terminal block of a submersible motor head is provided. A method of assembly of the pothead connector is also provided. The pothead connector comprises a housing that defines a plurality of passageways that extend in a longitudinal direction and are each configured to receive one of the electrical cables. Each passageway is further configured to receive a shroud that encircles the electrical cable within that one passageway. A first end of the shroud compresses a packing seal to form a liquid impermeable seal with each passageway and with the outer surface of the electrical cable. Each shroud is biased in the longitudinal direction to compress the packing seal by a plurality of spring stacks separated by a plurality of spacers. The second end of the shroud is capable configured to mate with a recess in the terminal block.

Abstract: A technique includes providing a chamber in a well tool to receive pressure to control an operation of the tool. The technique includes providing a seal to isolate the chamber from well pressure. The technique also includes providing a pressure relief mechanism to relieve pressure from the chamber in response to the pressure exceeding a threshold.

Abstract: An adhesive composition includes 100 parts by weight of a polyolefin polymer derived from an olefin monomer copolymerized with at least one co-monomer that is different form the olefin monomer; 1˜100 parts by weight of an adhesion promoting agent comprising a polybutadiene polymer, which has a molecular weight of 1,000˜10,000 and has an anhydride group grafted thereon; 0.1˜5 parts by weight of an antioxidant; and 0.5˜15 parts by weight of a curative agent. An adhesive composition includes 100 parts by weight of a polyolefin polymer derived from an olefin monomer copolymerized with at least one co-monomer that is different form the olefin monomer, where in the polyolefin polymer comprises an anhydride group grafted thereon; 0.1˜5 parts by weight of an antioxidant; and 0.5˜15 parts by weight of a curative agent.

Abstract: A submersible pumping system includes a submersible pump; a gauge disposed proximate the submersible pump; a Stirling cooler disposed proximate the gauge, wherein the Stirling cooler has a cold end configured to remove heat from the gauge and a hot end configured to dissipate heat; and an energy source configured to power the submersible pumping system.

Abstract: A kickover tool is for placing and extracting a valve in a mandrel having a tool body extending in a longitudinal direction and having a hydraulic piston chamber therein. A hydraulic piston is located inside the hydraulic piston chamber. A kickover arm portion is mechanically connected to the hydraulic piston, the kickover arm portion comprising a kickover arm having a tool portion. The kickover arm has a non-kicked-over position where the kickover arm is substantially coaxial with the longitudinal direction and a kicked-over position where the kickover arm is substantially non-coaxial with the longitudinal direction. The kickover arm moves to the kicked-over position upon extension of the hydraulic piston.

Abstract: The claimed invention relates to a submersible direct-current electric motor to be used, in particular, for driving a submersible pump in downhole oil production. The claimed motor includes a fixed armature winding; a housing which encloses the armature winding and rotates around it; magnetic field generation means which are fixed in the housing and interact with the armature winding to generate electromagnetic torque; a fixed collector which is electrically connected to the armature winding; brushes which rotate around the fixed collector and are connected to the external electric circuit. The fixed collector and the brushes rotating around it are enclosed in an insulating chamber. The technical result consists in the elimination of the risk of a short circuit between the brushes and the collector of the direct-current motor when it is used as a submersible motor.

Abstract: A technique improves the pumping performance of a centrifugal pump in a cost-effective manner. The centrifugal pump comprises a pumping component having one or more vanes defining fluid flow paths. A passage is formed through at least one vane such that an end of the passage is exposed to a low energy flow, i.e. secondary flow, region. Each passage enables the flow of a small amount of fluid from the low energy region to an opposite side of the vane to reduce the secondary flow effects and improve pumping efficiency.

Abstract: For optimizing well production, intervals are selected along a deviated wellbore, and a well test and treatment string is deployed in the wellbore. Each interval is then isolated to enable performance of desired testing. The test data obtained is evaluated to determine an appropriate remedial action which is then implemented via the well test and treatment string. The system and method enable the testing and treatment of a plurality of intervals along a horizontal well during the same run downhole.

Abstract: A gas lift valve has a flow restrictor, a valve part on one side of the flow restrictor, a flow deflector and a tubular member on another side of the flow restrictor, and a flapper valve on the side of the flow restrictor where the tubular member is located, the flapper valve being adjacent to the tubular member. When fluid flows into the gas lift valve at sufficient pressure, the valve part opens, the fluid flows through the flow restrictor and acts on the flow diverter thereby moving the tubular member and opening the flapper valve. The tubular member extends though the opening the flapper valve covered.

Abstract: A statistical methodology is disclosed to provide time-to-event estimates for oilfield equipment. A method according to the present invention extracts unbiased information from equipment performance data and considers parameters interactions without recourse to data thinning. The analysis explicitly accounts for items of equipment that are still operational at the time of analysis. A method according to the present invention may also be utilized to apply survival analysis to any oilfield equipment components where time-to-event information has been recorded. The method of the present invention allows comparative reckoning between different components present in the system comprising several or many individual components and allows analysis of these components either individually or simultaneously, i.e., in the presence of other components.

Abstract: An apparatus and method is provided for protecting control lines used with tool strings in a downhole environment. A control line protector assembly comprises a plurality of components formed into a unitary piece which includes a guard section having a first end section and a second end section, a slot on each of the first end section and the second end section, and a securing mechanism for coupling the guard section having the first end section and the second end section to the coupling. A control line protector assembly is formed using a metal stamping process.

Abstract: An apparatus for use in a wellbore includes a tool string and a plurality of sensors, which include at least a first sensor to detect pressure signals in an inner conduit of the tool string and at least a second sensor to detect pressure signals in an annulus outside the tool string. A controller actuates a tool in the tool string in response to a logical combination of outputs from the sensors, where the outputs of the sensors are responsive to the respective pressure signals.