Well pump unit

FIELD: oil and gas industry.

SUBSTANCE: submersible centrifugal pump with electric motor is installed in the well on a tubing string. A compensator is installed above them. A pneumatic cap with piston is placed therein. From the inside, the piston is spring-loaded by pack series-connected plate springs separated by gaskets. The gaskets form a clearance with pneumatic cap inner surface. The plate springs are configured with different ratios of spring cone height to cone wall thickness and have such power characteristic, so that at parallel connection of forces of spring stack and pressure inert gas on the piston, a resultant restoring force is created with working portion of given low quasi-zero rigidity.

EFFECT: increased serviceability and reliability of plant operation, reduced vibration of underground pump equipment caused by presence of gas inclusions in pumped out product.

8 dwg

 



 

Same patents:

FIELD: oil-and-gas industry.

SUBSTANCE: electric equipment comprises the units (2) of submersible electric pumps per number of wells (1) connected through a cable (6), and the step-up transformer (3) with the respective land station (4) for direct starting controls connected to a power network. The electric equipment is also fitted with an operating controller (7), at least, one control station (8) with a frequency converter connected through an additional step-up transformer (10) to a power line and a unit (9) of operated contactors (11). Electric motors (13) of pumps are designed synchronous with permanent magnets in rotors. Stations (4) are fitted with the controllers (12) connected with the operating controller (7). In the unit (9) input pins of power contacts of contactors (11) are connected to the station (8) output, their output pins are connected respectively with the output of the respective station (4). Control circuits of contactors (11) of the unit (9) and the station (4) are connected with the controller (7) output.

EFFECT: improvement of energy efficiency and depreciation of electric equipment of an oil well pad with ensuring of the possibility of selection regulation.

5 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: this system is used for transfer of fluids from deep wells. Said pump is equipped with bearings and bushes that feature optimum working stroke with duel allowance for such operating conditions as load, stroke, pressure and tension. Besides, said bearings and bushes are engaged with drive string to facilitate efficient installation and dismantling. Said bearings or bushes are not secured to flow string or drive string. In compliance with invention versions, said drive string can be perforated while extracted fluid can be used for lubing of the system bearings.

EFFECT: stable revolution, ease of repair and servicing.

4 cl, 13 dwg

FIELD: engines and pumps.

SUBSTANCE: pump contains pump modules (1, 2) with connecting details. The details are fitted with a coupling (11) and designed as forks (6, 7) which are fitted with external ring grooves for a locking device. The lock device is fixed in the ring groove by the coupling (11).

EFFECT: simplification of pump mounting in a well, decrease of labour input and time of mounting.

5 dwg

FIELD: oil and gas industry.

SUBSTANCE: pump contains body, in which stage packages of different types are installed, containing the guide vanes and impellers installed on the shaft (1) and rotating together with it. At the pump input the package (I) with axial stages is installed, it contains guide vanes (3) and impellers (2) with spiral blades, above it the next package (II) - dispergator is installed, it is made in form of stator-sleeves (5) and rotors (4) having of the mating surfaces shoulders and depressions. Then successively the package (III) of transition stages and packages (VI) with stages of main centrifugal pump are installed. The flow channels of the transition stages are made with width close to width of the flow channels of the main pump stages.

EFFECT: creation of the submersible pump to transfer gas-liquid mixtures able to operate effectively and to develop high head in wide range of concentrations of mixture undissolved gas.

4 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: submersible pump contains stages with impellers and guide vanes in form of top and bottom disks with installed between them vanes, and is equipped with permanent ring magnet. The ring magnet is installed in the pocket made on the outside surface of the top disk of the guide vanes located in the lower stages of the pump. Number of stages with installed ring magnets is selected on condition of oil flowing for at least 100 s.

EFFECT: reduced probability of salt deposits on wall of the flowing channels, increased pump reliability due to increased efficiency of magnetic treatment.

4 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to the field of hydrocarbons production and is intended for liquid pumping by submersible pumps. The input module of the submersible pump with tight connections consists of a housing designed without axis shift with reference to casing elements, with flanges for connection with the pump and the submersible electric motor. The module has a through channel for the pump unit shaft, channels for liquid passing. In the module housing a separate channel for placement of a tight bilateral coupling of electric connection of the submersible electric motor with the cable extender, holes for filling with electric insulating liquid and for pressure testing of connection of the electric line are provisioned. The module is connected to the tight casing by means of threaded split nut located in a deepening of the input module, the guiding spline and sealing ring elements for sealing of connection with the tight casing of the electric motor. The casing is designed with a possibility of movement during assembly and disassembly along the key slot that excludes mutual rotation of the tight casing and the input module, twisting of a power cable in the casing and its damage.

EFFECT: invention is aimed at expansion of scope of application of the input module in the units with submersible pumps, improvement of its safety and reliability.

2 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: set of inventions relates to pump engineering. Rotary pump comprises impellers not fitted on central shaft. In particular, every impeller has separate hub to engage with adjacent hub of the other impeller. Said hubs run in synchronism to spin said impellers.

EFFECT: material savings, accelerated assembly.

20 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to submersible pumping units for operation of wells, where it is necessary to increase the differential pressure drawdown, without deepening of submersible pumping unit, and/or with unsealed production casing. The unit for oil-well operation includes the tubing string, electric submersible cable, electric submersible pump, the hydroprotection and submersible electric motor of which are encapsulated in the pressure-tight housing, which is tightly closed on the housing of the input unit of the electric submersible pump, the liner consisting from the pipe string the top part of which through the bushing is tightly connected to the bottom part of the pressure-tight housing, and in the bottom part of the liner the branch pipe with external sealing elements is located. The unit contains at least one packer with internal through passage channel with the diameter allowing to pass through the packer the tool, equipment and instruments, without extracting the packer. The sealing unit for the tight connection with the branch pipe of the liner is located either in the packer housing, or in the device below or above the packer.

EFFECT: improvement of performance of recovery of formation fluid from the wells.

1 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to pump engineering, particularly, to downhole multistage pumps used for oil extraction and water feed into a productive oil formation to keep up and to up the formation pressure. A pump stage consists of a closed impeller with a drive disc, blades, driven disc, a distributor including a cylindrical case, top and bottom discs with blades there between to make return channels, and spiral ribs. The spiral inclined ribs are arranged on the cylindrical case inner lateral surface opposite the impeller outlet. He spiral ribs are arranged in a shaped insert made of an elastomer and secured on the distributor cylindrical case surface.

EFFECT: invention is aimed at elongation of the life of stages owing to higher wear resistance of the distributor sidewall opposite the flow exit from the impeller.

3 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: double-packer pump unit includes a pipe string of a lesser diameter placed concentrically or eccentrically in a pipe string of a larger diameter. The pipe string of the larger diameter is equipped with the lower and upper packers with a cable input mounted over an electrically driven pump and a return valve. Below the lower packer and over the upper packer the lower criss-cross flow coupling, the lower drain valve and the upper criss-cross flow coupling, the upper drain valve are installed respectively. A control cable, for example, a fibreglass cable, may be laid along the whole equipment and through the packers. A circulation valve and a balancing valve are installed between the lower and upper packers. Above the drain valve the double-packer pump unit is equipped with a disconnector with a hydraulic anchor mounted above it.

EFFECT: improved operational efficiency of the unit and increased reliability of the circulation valve.

4 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and may be used in the operation of a horizontal well. According to the method well operation is performed. A pipe string is run down to the horizontal well. An insulating material is injected through the pipe string to a water-inflow interval of the productive formation. Oil is extracted until the horizontal well is flooded. Under the main borehole along the boundary of the oil-water contact an additional borehole is drilled from the horizontal well per 50 m longer than the old hole. The coil tubing is run down to the well complete from below with a hydraulic whipstock and a screen, which openings are covered hermetically by a hollow bushing. The process fluid is injected to the coil tubing thus creating an excess pressure. Simultaneously the coil tubing is moved down until it gets to the additional borehole. The coil tubing is run down up to the bottomhole of the additional hole. At the wellhead a top cementing plug is set into the coil tubing. An excess pressure is created in the coil tubing above the top cementing plug and the hollow bushing is moved thus opening the screen openings. Microcement grout is injected through the coil tubing and flushed to the additional hole and the bottomhole zone. Simultaneously the coil tubing is pulled out for the purpose of additional hole filling with the microcement grout. Flushing of the microcement grout is stopped when pressure increases in the coil tubing up to a permissible value. The coil tubing is pulled out from the well and the process is withheld for cement setting and hardening. The additional hole is cut off from the old hole by setting a bridge plug in a kickoff interval at the inlet to the offshoot. A pump is run down at the process pipe string to the old hole of the horizontal well and operation of the horizontal well is started. At water encroachment into the produced product the process pipe string with the pump is pulled out from the well, a geophysical study is performed and a water-producing interval is indentified in the horizontal well. The water-producing interval in the old hole of the horizontal well is isolated.

EFFECT: increased efficiency of the method due to the complete exhaustion of oil reserves from the productive formation notwithstanding the drawdown value.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to oil and gas industry, and namely to methods of automatic flow control at well operation of oil and gas deposit. According to the method injectors and producers equipped with pump units and electric motors are used. A passive sonar multiphase flow meter is mounted at the mouth of each well. Pressure, temperature and flow rate is defined continuously in real time for each phase, including water. The data are collected and transferred to automatic flow process control system continuously in real time. The data are averaged for a certain period of time. Average flow rate is processed and defined by phases for the selected period of time. The results are compared with preset parameters and based on flow rate data for each phase dependency of flow rate for each well is defined on pumped volume of brine water. Version of pump units operation with electric motors for producers is selected and maintained so that oil flow rate is maximum and pumped volume of brine water and power consumption is minimum. At that when design flow rate values are exceeded one of the following actions is performed: efficiency of pump unit is reduced due to reduced rate speed of the electric motor; efficiency of pump unit is increased due to increased rate speed of the electric motor; pump unit is stopped temporarily to accumulate oil in the bottom hole. Product of the producers is separated into phases and transported depending on the phase to oil and gas collection system or reservoir pressure maintenance system.

EFFECT: increased efficiency of the method due to increased oil flow rate, reduced volume of brine water pumped and reduced power consumption.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to systems of oil and gas equipment automatic control and allows timely detecting of pre-emergency situations related to hydrate formation in gas equipment. According to the method gas pressure and temperature is measured periodically upstream and downstream gas equipment, gas flow rate through gas equipment or gas pressure drop is measured at orifice located in the gas flow passing through gas equipment. Then against measured values hydrate formation coefficient is formed for operating gas equipment and degree of hydrate formation is evaluated against deviation of this coefficient from the basic value determined in hydrate-free mode of gas equipment. In hydrate-free mode of gas equipment basic values of the above hydrate formation coefficient are used as technical state indicator for gas equipment.

EFFECT: method allows timely detecting of pre-emergency situations related to hydrate formation in gas equipment.

3 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method fluid pumping from the well is alternated with fluid accumulation in the well at switched off pump set and average delivery in time is controlled for the purpose of matching with the well flow rate by changing speed rate of the pump shaft. Pump capacity in pumping process is controlled by a submersible flow rate meter placed at the pump output. Pumping out will be performed till the pump reaches the preset minimum pressure at suction and accumulation will be performed till the pump reaches the preset maximum pressure. Pressure value is controlled by means of a submersible pressure sensor. Frequency of the pump shaft rotation during pumping period is changed on the basis of readings of the submersible flow rate meter so that maximum value of efficiency factor is reached for the pump during pumping period. Time of accumulation is limited by regulations on motionless fluid in surface equipment in winter time by permitted decrease of oil temperature in the submersible electric motor and permitted frequency of stops and starts of the latter. Maximum pressure value for the cemented stratum is selected on condition of maximum oil production and for the stratum destructed intensely in extraction process on conditions of minimum discharge of mechanic impurities.

EFFECT: increased production and maintained reliability for submersible equipment due to its operation in the mode of maximum efficiency factor.

FIELD: physics.

SUBSTANCE: methods and systems for gathering, deriving and displaying the azimuthal brittleness index of a borehole are disclosed. Certain embodiments include various methods for calculating and displaying borehole measurements in real-time for geosteering and drilling operations. One embodiment of the disclosed method for calculating and displaying azimuthal brittleness includes a step of taking measurements of compressional and shear wave velocities as a function of position and orientation from inside the borehole. These velocity measurements are taken by an azimuthal acoustic device. Azimuthal brittleness is then derived based on the compressional and shear wave velocities.

EFFECT: high reliability of data of planning geological survey operations.

19 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes cyclic forced gas pumping from the annulus and pressure decreasing in it. Periodically the well flow header is partially closed. Pressure upstream the shutdown element of the header is increased to ensure the produced fluid supply to the expansion chamber of the tank with resilient element and to accumulate mechanical energy in the expansion chamber. Then full opening of the header shutdown element is performed. Pressure upstream the shutdown element is decreased, and fluid is displaced from the expansion chamber to the header due to the accumulated mechanical energy. Each cyclic volume increasing of part of the tank above the expansion chamber ensures annulus gas suction in it, and this volume decreasing ensures gas displacement to the header.

EFFECT: possibility of gas pumping from the annulus in tubing string of the well for different methods of mechanised oil production.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil production industry, in particular, to secondary and tertiary methods of enhanced oil recovery for beds with low oil saturation that envisage use of equipment for production of gaseous nitrogen with high pressure and temperature. Nitrogen compressor plant comprises a multistage piston-type compressor with a power drive unit made as diesel engine, and gas-separating unit. Output of the compressor intermediate stage is coupled to input of gas-separating unit. Output of gas-separating unit is coupled to input of the compressor stage, which follows the intermediate stage. At that nitrogen compressor plant includes heat exchanger, which working medium input is coupled to the compressor output. Input of the compressor heat exchanger is coupled to exhaust output of diesel engine. Gas-separating unit is made as a hollow-fibre membrane unit. Output of the heat exchanger working medium is coupled to input of additional heater. At that output of the additional heater serves as output of the station.

EFFECT: development of more effective means for oil extraction from low-permeable collectors complicated by high paraffin content.

8 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: device comprises a pipe string run in to the well, a packer with a flow shutoff mounted in it. The packer is made as a hollow body with the upper row of openings placed above the sealing element in the packer. Inside the hollow body there is a pipe concentric to its axis and fixed rigidly to the pipe string from top and to the piston from bellow. The pipe with piston may be moved axially in regard to the hollow case of the flow shutoff. In the hollow body below the sealing element of the packer there is the lower row of openings. The piston is made hollow and plugged from below. Opposite the upper and lower rows of openings in the hollow body the piston is equipped with inner cylindrical sample capture and a row of feedthrough openings. In the hollow body above the upper row of radial openings there is a cam slot in the form of longitudinal groove and three transversal grooves. The transversal grooves are made from the upper, medium and lower parts of the lower part of the longitudinal grove. In cam slot of the hollow body there is a guide pin installed so that it may be moved axially and transversally. It is fixed rigidly in the piston above its upper inner circular sample capture. When the guide pin is placed in the transversal groove made of the medium part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper and lower rows of openings with over-packer and below-packer space of the well. When the guide pin is placed in the transversal groove made of the upper part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper row of openings with over-packer space of the well. The lower row of openings in the hollow body is sealed in tight-proof way by the piston. When the guide pin is placed in the transversal groove made of the lower part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the lower row of openings with below-packer space of the well. At that the upper row of openings in the hollow body is sealed in tight-proof way by the piston.

EFFECT: simplified design of the device, improved reliability of its operation and expanded functionality.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas producing industry and can be used for annular gas bypassing to the flow string in wells operated by sucker-rod pump units. Task of the invention is to perfect design of the downhole device for annular gas bypassing in order to improve operational efficiency of the well sucker-rod pumping equipment notwithstanding temperature conditions of the well operation and pressure of annular gas. The device is placed in the well annular space over the well fluid level in the flow string collar. The device comprises a return valve and a radial hydraulic channel. In the collar lower part there is a radial hydraulic channel interconnected to the well annular space at the one side through the return valve and to the flow string cavity at the other side through a jet device. At that axes of the radial hydraulic channel and the jet device are crossed in the nozzle area of the latter. Besides the device comprises a flow string with a whipstock for gas-fluid flow in it. The whipstock is made as a bushing capable to be fixed in the flow string collar. Length of the whipstock for gas-fluid flow is less than distance between receipt and discharge of the jet device. Axes of the radial hydraulic channel and the jet device are perpendicular. Fixation of the whipstock for gas-liquid flow in the flow string collar may be implemented by equipping the flow string collar with an inner groove and the whipstock for gas-liquid flow with a ring holder.

EFFECT: usage of device allows reducing pressure of annular gas notwithstanding temperature and pressure conditions thus increasing life between overhauls for the sucker-rod pumping equipment; besides, this device allows reducing pump-setting depth for the sucker-rod pump due to increase of fluid level over the pump thus reducing consumption of the flow string and pump rods and increasing life between overhauls for the units.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: according to the method the hydraulic fracturing of formation is performed. After hydraulic fracturing of the formation in the well the proppant underflash is left. From above in addition from the coarse fraction proppant the bridge with a rated length is created. This length is selected in view of the condition of providing of counter-pressure on the proppant in the hydraulic fracturing crack sufficient for holding of proppant in a hydraulic fracturing crack at decrease of liquid level in the well down to the well bottomhole level. The package of downhole pumping equipment includes the antisand filter. During the well operation the antisand filter is placed directly over the proppant bridge. The liquid is sampled. The liquid level during liquid sampling - operation is maintained at the level of the deep-well pump.

EFFECT: increase in oil production.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: device comprises a pipe string run in to the well, a packer with a flow shutoff mounted in it. The packer is made as a hollow body with the upper row of openings placed above the sealing element in the packer. Inside the hollow body there is a pipe concentric to its axis and fixed rigidly to the pipe string from top and to the piston from bellow. The pipe with piston may be moved axially in regard to the hollow case of the flow shutoff. In the hollow body below the sealing element of the packer there is the lower row of openings. The piston is made hollow and plugged from below. Opposite the upper and lower rows of openings in the hollow body the piston is equipped with inner cylindrical sample capture and a row of feedthrough openings. In the hollow body above the upper row of radial openings there is a cam slot in the form of longitudinal groove and three transversal grooves. The transversal grooves are made from the upper, medium and lower parts of the lower part of the longitudinal grove. In cam slot of the hollow body there is a guide pin installed so that it may be moved axially and transversally. It is fixed rigidly in the piston above its upper inner circular sample capture. When the guide pin is placed in the transversal groove made of the medium part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper and lower rows of openings with over-packer and below-packer space of the well. When the guide pin is placed in the transversal groove made of the upper part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper row of openings with over-packer space of the well. The lower row of openings in the hollow body is sealed in tight-proof way by the piston. When the guide pin is placed in the transversal groove made of the lower part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the lower row of openings with below-packer space of the well. At that the upper row of openings in the hollow body is sealed in tight-proof way by the piston.

EFFECT: simplified design of the device, improved reliability of its operation and expanded functionality.

3 dwg

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