阅读说明：本技术 一种潜油电机驱动的井下螺旋式梯形密封泵采油装置及工艺 (Underground spiral type trapezoidal sealing pump oil extraction device driven by submersible motor and process ) 是由 孙春龙 师国臣 孙延安 *** 钱坤 王羕 雷宇 于波 吴宁 王新民 于 2020-06-29 设计创作，主要内容包括：本发明涉及油田采油工程技术领域,属于一种潜油电机驱动的井下螺旋式梯形密封泵采油装置及工艺,本发明解决了无杆举升技术在高含气、高含砂、高矿化度及粘稠介质的水驱、聚驱、复合驱油井适应性差的弊端。它由地面中压变频柜(1)、潜油电缆(2)、油管(3)、单流阀(4)、油管变径(5)、螺旋式梯形密封泵(6)、胶囊保护器(7)、潜油电机(8)、信号传输电缆(9)、传感器(10)、油管变径(11)、防转扶正装置(12)、封隔器(13)、地面采油树(14)组成。通过地面中压变频控制系统,调节电机转速,控制油井采出液量,以保障螺旋式梯形密封泵的工作性能。本发明具有适用于中低排量大斜度、大平台的定向井和水平井举升等优点。(The invention relates to the technical field of oil field oil extraction engineering, belongs to an underground spiral type trapezoidal sealing pump oil extraction device and process driven by an oil-submersible motor, and solves the problem of poor adaptability of rodless lifting technology in water-flooding, polymer flooding and composite flooding wells with high gas content, high sand content, high salinity and viscous media. The oil-submersible-oil-well type oil-well drilling machine is composed of a ground medium-voltage frequency conversion cabinet (1), an oil-submersible cable (2), an oil pipe (3), a check valve (4), an oil pipe reducing diameter (5), a spiral type trapezoidal sealing pump (6), a capsule protector (7), an oil-submersible motor (8), a signal transmission cable (9), a sensor (10), an oil pipe reducing diameter (11), an anti-rotation righting device (12), a packer (13) and a ground oil production tree (14). Through the ground medium-pressure variable-frequency control system, the rotating speed of the motor is adjusted, and the liquid production amount of the oil well is controlled, so that the working performance of the spiral type trapezoidal sealing pump is guaranteed. The invention has the advantages of being suitable for directional well and horizontal well lifting of medium and low discharge capacity, large inclination and large platform, and the like.)

1. The utility model provides a spiral trapezoidal canned pump oil production device in oil motor driven in pit which characterized in that: the oil-submersible-oil-well type oil-well drilling machine is composed of a ground medium-voltage frequency conversion cabinet (1), an oil-submersible cable (2), an oil pipe (3), a check valve (4), an oil pipe reducing diameter (5), a spiral type trapezoidal sealing pump (6), a capsule protector (7), an oil-submersible motor (8), a signal transmission cable (9), a sensor (10), an oil pipe reducing diameter (11), an anti-rotation righting device (12), a packer (13) and a ground oil production tree (14). The upper end of the packer (13), the anti-rotation righting device (12), the oil pipe reducing diameter (11) and the sensor (10) are sequentially connected with each other by screw threads from bottom to top, the sensor (10), the submersible motor (8), the capsule protector (7) and the spiral type trapezoid sealing pump (6) are sequentially connected with each other by screw threads from bottom to top, and the spiral type trapezoid sealing pump (6), the oil pipe reducing diameter (5), the check valve (4), the oil pipe (3) and the ground Christmas tree (14) are sequentially connected with each other by screw threads from bottom to top; signal transmission cable (9) are drawn forth to latent oily motor (8) upper end from sensor (10) upper end, and latent oily cable (2) are drawn forth from latent oily motor (8) upper end and are fixed together with signal transmission cable (9) on latent oily motor (8), capsule protector (7), spiral trapezoidal canned pump (6), oil pipe (3) outer wall, and the two extends to ground production tree (14) lower extreme, draws forth to ground middling pressure inverter cabinet (1) from ground production tree (14) inside.

2. The oil extraction process of the underground spiral type trapezoidal sealing pump oil extraction device driven by the submersible motor is characterized in that: the method comprises the following specific steps:

a. setting the packer (13) to a predetermined downhole location;

b. sequentially putting an anti-rotation righting device (12), an oil pipe reducing diameter (11) and a sensor (10), connecting one end of a signal transmission cable (9) with the sensor (10) at a wellhead, and carrying out insulation test, wherein the insulation test is carried out once every 50-150 m underground is put;

c. connecting the sensor (10) and the submersible motor (8) by bolts at a wellhead and then performing downhole operation;

d. connecting the submersible motor (8) with the submersible cable (2) and then putting the submersible motor into the underground, wherein the signal transmission cable (9) is attached to the outer wall of the submersible motor (8) and fixed in the putting process;

e. after the submersible motor (8) is aligned with a transmission shaft of the capsule protector (7), the submersible motor and the transmission shaft are connected through a special spline housing and are sequentially put into the underground;

f. sequentially butting the capsule protector (7) with a transmission shaft of the spiral trapezoidal sealing pump (6) and then putting the capsule protector into the underground;

g. the wellhead is sequentially connected with a spiral trapezoidal sealing pump (6), an oil pipe reducing pump (5) and a check valve (4), wherein the check valve (4) is positioned at the upper part of the oil pipe reducing pump (5), the oil pipe reducing pump (5) is positioned at the upper part of the spiral trapezoidal sealing pump (6), and all the parts are connected and then sequentially put into the well;

h. in the process of putting the capsule protector (7), the spiral type trapezoid sealing pump (6), the oil pipe reducing (5) and the check valve (4) into the well, the signal transmission cable (9) and the submersible cable (2) are attached to the outer walls of the capsule protector and the oil pipe reducing and are put into the well together;

i. the single-flow valve (4) is connected with the lower end of the oil pipe (3) on the ground, the oil pipe (3) is sequentially lowered to a ground Christmas tree (14), the submersible cable (2) and the signal transmission cable (9) are attached to the oil pipe (3) in the lowering process, and a cable clamp is arranged on each oil pipe (3) and used for fixing the submersible cable (2) and the signal transmission cable (9);

j. measuring the insulation value and the direct current resistance of the signal transmission cable (9) and the submersible cable (2) every 50m-150m is put in;

k. the submersible cable (2) and the signal transmission cable (9) are led out to the ground medium-voltage frequency conversion cabinet (1) from the ground Christmas tree (14);

after the oil extraction device is installed, the submersible motor (8) is started, the produced fluid in the oil pipe enters the pump body from the inlet of the spiral type trapezoid sealing pump (6), flows out from the outlet of the pump after being pressurized by the spiral type rotor, and sequentially flows through the oil pipe reducing (5), the check valve (4), the oil pipe (3) and the ground Christmas tree (14) until the flow of the ground pipeline, so that the lifting process of the produced fluid is completed.

Technical Field

The invention relates to the technical field of oil field oil extraction engineering, and belongs to an underground spiral type trapezoidal sealing pump oil extraction device and process driven by an oil-submersible motor.

Background

The oil extraction technology of the submersible centrifugal pump developed aiming at the problem of the sucker rod pump under the special well condition cannot be well adapted to the problem of the oil well under the high gas content, high sand content and thick oil well condition, particularly, the phenomena of motor burnout, cavitation, scaling and slippage are easy to occur in the using process of a medium and small discharge oil well, the normal production of the oil well is influenced, the oil field yield is reduced, and the maintenance cost is increased. Therefore, a novel oil extraction technology of the underground spiral trapezoid sealing pump driven by the submersible motor is developed, the trapezoid structure sealing of fluid in the pump under high-speed operation is achieved through the spiral line design of the stator and the rotor, the lifting characteristics of large flow channel and gas-liquid mixed conveying are realized, and the requirements of high gas content, high sand content, high mineralization and heavy oil well lifting of a water-flooding, polymer-flooding and compound-flooding oil well are further met. The technology applies the spiral mixed transportation pump to the field of oil extraction engineering for the first time, expands the application range and the use limit of the axial flow mixed transportation pump, further prolongs the pump inspection period of an oil well, reduces the lifting energy consumption, and expands the application range of the rodless pump lifting technology.

Disclosure of Invention

The invention aims to effectively improve the applicability of a rodless pump oil production technology under special well conditions, realize the effective lifting of oil well produced liquid under the special well conditions, and is suitable for special well conditions of high gas content, high sand content, high salinity and viscous fluid medium of water-drive, polymer-drive and compound-drive oil wells.

The specific technical content of the invention is as follows: the device comprises an oil-submersible cable, an oil pipe reducing valve, a check valve, a spiral trapezoidal sealing pump, a capsule protector, an oil-submersible motor, a signal transmission cable, a sensor, an anti-rotation righting device and a packer. The packer, the anti-rotation righting device, the oil pipe reducing and the sensor are connected with each other in a threaded manner sequentially from bottom to top, the sensor, the submersible motor, the capsule protector and the spiral type trapezoid sealing pump are connected with each other in a threaded manner sequentially from bottom to top, and the spiral type trapezoid sealing pump, the oil pipe reducing and the check valve are connected with each other in a threaded manner sequentially from bottom to top; the signal transmission cable is led out from the upper end of the sensor to the upper end of the submersible motor, the submersible cable is led out from the upper end of the submersible motor and is fixed on the submersible motor, the capsule protector, the spiral type trapezoid sealing pump and the outer wall of the oil pipe together with the signal transmission cable, the submersible cable and the capsule protector extend to the lower end of the ground Christmas tree, and the submersible cable and the capsule protector are led out from the inside of the ground Christmas tree (14) to the ground medium-voltage frequency conversion.

The underground spiral type trapezoid sealing pump oil extraction device and process driven by the submersible motor of the device are utilized, and the specific steps are as follows:

a. setting the packer 13 to a predetermined downhole location;

b. sequentially putting an anti-rotation righting device 12, an oil pipe reducing 11 and a sensor 10, connecting one end of a signal transmission cable 9 with the sensor 10 at a wellhead, and carrying out insulation test once every 50-150 m underground is put;

c. connecting the sensor 10 with the submersible motor 8 by using a bolt at a wellhead and then performing downhole operation;

d. connecting the submersible motor 8 with the submersible cable 2 and then putting the submersible motor into the underground, wherein a signal transmission cable 9 is attached to the outer wall of the submersible motor 8 and fixed in the putting process;

e. after the submersible motor 8 is centered with a transmission shaft of the capsule protector 7, the submersible motor and the transmission shaft are connected through a special spline sleeve and are sequentially put into the well;

f. sequentially butting the capsule protector 7 with a transmission shaft of the spiral trapezoidal sealing pump 6 and then putting the capsule protector into the underground;

g. a spiral type trapezoid sealing pump 6, an oil pipe reducing diameter 5 and a check valve 4 are sequentially connected to a wellhead, wherein the check valve 4 is positioned at the upper part of the oil pipe reducing diameter 5, the oil pipe reducing diameter 5 is positioned at the upper part of the spiral type trapezoid sealing pump 6, and all the parts are connected and then sequentially put into the well;

h. in the process of putting the capsule protector 7, the spiral trapezoid sealing pump 6, the oil pipe reducing 5 and the check valve 4 into the well, the signal transmission cable 9 and the oil-submersible cable 2 are attached to the outer wall of the capsule protector and put into the well together;

i. the single-flow valve 4 is connected with the lower end of the oil pipe 3 on the ground, the oil pipe 3 is sequentially lowered to a ground Christmas tree 14, the submersible cable 2 and the signal transmission cable 9 are attached to the oil pipe 3 in the lowering process, and each oil pipe 3 is provided with a cable clamp for fixing the submersible cable 2 and the signal transmission cable 9;

j. measuring the insulation value and the direct current resistance of the signal transmission cable 9 and the submersible cable 2 every 50m-150 m;

k. the submersible cable 2 and the signal transmission cable 9 are led out to the ground medium-voltage frequency conversion cabinet 1 from the ground Christmas tree 14;

after the oil-submersible motor 8 is installed, the produced fluid in the oil pipe enters the pump body from the inlet of the spiral trapezoid sealing pump 6, flows out of the pump body after being pressurized by the spiral rotor, sequentially flows through the oil pipe reducing 5, the check valve 4, the oil pipe 3 and the ground Christmas tree 14 until reaching the ground pipeline flow, and the lifting process of the produced fluid is completed.

Compared with the prior art, the invention has the following advantages:

1) the submersible motor with high voltage and small current is combined with the medium-voltage frequency conversion device, so that the voltage transmission loss of the cable and the motor is reduced, the frequency conversion starting of a rotating shaft is realized, the liquid production amount of an oil well is controlled, the impact current in the starting and stopping process is reduced, the submersible cable and the motor are protected, and the full coverage of low, medium and high discharge volumes of the produced liquid of the oil well is realized;

2) the shape of the pump body stator and rotor is determined by a spiral line, fluid is spirally and axially raised in the pump body, the higher the rotating speed is, the better the sealing of the pump body is, the lower the leakage quantity is, and the higher the lifting lift is; the rotor of the pump is a complete rotating body, and has high coaxiality, low vibration and noise and strong reliability.

3) The stator and the rotor are in clearance fit, so that the pump is not easy to clamp, the flow passage is wide, and viscous liquid is easy to convey; the fluid is in a turbulent flow state in the pump, the air carrying capacity is enhanced, and the air blockage and air binding are not easy to happen

Description of the drawings: FIG. 1 is a schematic view of a process column of the present invention.

The specific implementation mode is as follows: the invention is further explained by combining the attached drawings, and the underground spiral type trapezoidal sealing pump oil extraction device driven by the submersible motor comprises a medium-voltage frequency conversion cabinet 1, a submersible cable 2, an oil pipe 3, a check valve 4, an oil pipe reducing diameter 5, a spiral type trapezoidal sealing pump 6, a capsule protector 7, a submersible motor 8, a signal cable 9, an oil pipe reducing diameter 10, a sensor 11, an anti-rotation righting device 12, a packer 13 and a ground Christmas tree 14. Wherein the upper end of the packer 13, the anti-rotation righting device 12, the oil pipe reducing 11 and the sensor 10 are sequentially connected with each other by screw threads from bottom to top, the sensor 10, the submersible motor 8, the capsule protector 7 and the spiral type trapezoid sealing pump 6 are sequentially connected with each other by bolts from bottom to top, and the spiral type trapezoid sealing pump 6, the oil pipe reducing 5, the check valve 4 and the oil pipe 3 are sequentially connected with each other by screw threads from bottom to top; the signal transmission cable 9 is led out from the upper end of the sensor 10 to the upper end of the submersible motor 8, the submersible cable 2 is led out from the upper end of the submersible motor 8 and is fixed on the outer walls of the submersible motor 8, the capsule protector 7, the spiral type trapezoid sealing pump 6 and the oil pipe 3 together with the signal transmission cable 9, the two extend to the lower end of the ground Christmas tree 14, and the signal transmission cable is led out from the inside of the ground Christmas tree 14 to the ground medium-voltage frequency conversion cabinet 1.

The oil extraction process of the underground spiral type trapezoidal sealing pump oil extraction device driven by the submersible motor comprises the following specific steps:

a. setting the packer 13 to a predetermined downhole location;

b. sequentially putting an anti-rotation righting device 12, an oil pipe reducing 11 and a sensor 10, connecting one end of a signal transmission cable 9 with the sensor 10 at a wellhead, and carrying out insulation test once every 50-150 m underground is put;

c. connecting the sensor 10 with the submersible motor 8 by using a bolt at a wellhead and then performing downhole operation;

d. connecting the submersible motor 8 with the submersible cable 2 and then putting the submersible motor into the underground, wherein a signal transmission cable 9 is attached to the outer wall of the submersible motor 8 and fixed in the putting process;

e. after the submersible motor 8 is centered with a transmission shaft of the capsule protector 7, the submersible motor and the transmission shaft are connected through a special spline sleeve and are sequentially put into the well;

f. sequentially butting the capsule protector 7 with a transmission shaft of the spiral trapezoidal sealing pump 6 and then putting the capsule protector into the underground;

g. a spiral type trapezoid sealing pump 6, an oil pipe reducing diameter 5 and a check valve 4 are sequentially connected to a wellhead, wherein the check valve 4 is positioned at the upper part of the oil pipe reducing diameter 5, the oil pipe reducing diameter 5 is positioned at the upper part of the spiral type trapezoid sealing pump 6, and all the parts are connected and then sequentially put into the well;

h. in the process of putting the capsule protector 7, the spiral trapezoid sealing pump 6, the oil pipe reducing 5 and the check valve 4 into the well, the signal transmission cable 9 and the oil-submersible cable 2 are attached to the outer wall of the capsule protector and put into the well together;

i. the single-flow valve 4 is connected with the lower end of the oil pipe 3 on the ground, the oil pipe 3 is sequentially lowered to a ground Christmas tree 14, the submersible cable 2 and the signal transmission cable 9 are attached to the oil pipe 3 in the lowering process, and each oil pipe 3 is provided with a cable clamp for fixing the submersible cable 2 and the signal transmission cable 9;

j. measuring the insulation value and the direct current resistance of the signal transmission cable 9 and the submersible cable 2 every 50m-150 m;

k. the submersible cable 2 and the signal transmission cable 9 are led out to the ground medium-voltage frequency conversion cabinet 1 from the ground Christmas tree 14;

after the oil-submersible motor 8 is installed, the produced fluid in the oil pipe enters the pump body from the inlet of the spiral trapezoid sealing pump 6, flows out of the pump body after being pressurized by the spiral rotor, sequentially flows through the oil pipe reducing 5, the check valve 4, the oil pipe 3 and the ground Christmas tree 14 until reaching the ground pipeline flow, and the lifting process of the produced fluid is completed.