阅读说明：本技术 一种复合连续油管配套的抽油装置及其控制方法 (Oil pumping device matched with composite continuous oil pipe and control method thereof ) 是由 刘少胡 杨洋 付必伟 阳婷 曲宝龙 于 2021-07-26 设计创作，主要内容包括：本发明涉及一种抽油装置,具体涉及一种复合连续油管配套的抽油装置。该抽油装置包括井上部件和井下部件,井上部件通过复合连续油管与井下部件连接；井上部件包括采油树和控制柜；井下部件包括潜油电机和螺杆泵本体。该抽油装置不易脱扣、短杆、偏执,且能耐磨损,延长使用寿命；能够在井下依据不同的井况进行智能调速,以达到最合适转速,提高使用寿命的同时有效地增加了采油速率；能够对潜油电机实行断电保护,避免了因空转或不转造成的损伤,进一步提高了使用寿命；解决了现有采油泵存在的脱扣、短杆、偏执,或易磨损,且使用寿命低的问题。(The invention relates to an oil pumping device, in particular to an oil pumping device matched with a composite continuous oil pipe. The oil pumping device comprises an uphole component and an downhole component, wherein the uphole component is connected with the downhole component through a composite coiled tubing; the aboveground part comprises a Christmas tree and a control cabinet; the downhole component comprises a submersible motor and a screw pump body. The oil pumping device is not easy to trip, short in rod and deflected, can resist abrasion and prolong the service life; the intelligent speed regulation can be carried out underground according to different well conditions so as to achieve the most appropriate rotating speed, the service life is prolonged, and the oil extraction rate is effectively increased; the power-off protection can be carried out on the submersible motor, so that the damage caused by idling or non-rotation is avoided, and the service life is further prolonged; the problems of tripping, short rod, deflection, easy abrasion and short service life of the existing oil extraction pump are solved.)

1. An oil pumping device matched with a composite coiled tubing comprises an aboveground part and an underground part, wherein the aboveground part is connected with the underground part through the composite coiled tubing (1); the aboveground component comprises a Christmas tree (2) and a control cabinet (3); the method is characterized in that: the underground part comprises an upper shell (4), a lower shell (5), an oil-submersible motor (6) and a screw pump body (7), wherein the lower shell (5) is arranged at the bottom of the upper shell (4), the oil-submersible motor (6) is arranged in the lower shell (5), and the oil-submersible motor (6) is electrically connected with the control cabinet (3) through a relay (8); a transmission shaft (10) is arranged on an output shaft of the submersible motor (6) through a speed reducer (9); a screw pump body (7) is arranged in the upper shell (4), a filter screen (11) is arranged between the upper shell (4) and the lower shell (5) through a filter screen bracket, and the inlet of the screw pump body (7) is communicated with the outside through the filter screen (11); the screw pump body (7) is composed of a stator (701) and a screw rotor (702), the screw rotor (702) is inserted in the stator (701), and the screw rotor (702) is connected with the transmission shaft (10) through a universal joint (12); the submersible motor (6) is also provided with a rotating speed sensor (13), the outer side of the filter screen (11) is provided with a flow velocity sensor (14), and the flow velocity sensor (14) and the rotating speed sensor (13) are respectively and electrically connected with the control cabinet (3).

2. The oil pumping device matched with the composite coiled tubing according to claim 1, wherein: the oil production device is characterized in that a continuous oil pipe connector (16) is mounted on the outlet end face of the stator (701) through an outlet flange (15), and the continuous oil pipe connector (16) is communicated with the Christmas tree (2) through the composite continuous oil pipe (1).

3. The oil pumping device matched with the composite coiled tubing according to claim 1, wherein: the composite coiled tubing (1) is composed of a coiled tubing (101), a protective layer (102) and connecting cables (103), the protective layer (102) wraps the outer wall of the coiled tubing (101), and the connecting cables (103) are uniformly distributed in the protective layer (102) in an annular manner; the coiled tubing (101) is respectively communicated with the coiled tubing connector (16) and the Christmas tree (2); the control cabinet (3) is respectively connected with the relay (8), the flow velocity sensor (14) and the rotating speed sensor (13) through connecting cables (103).

4. The oil pumping device matched with the composite coiled tubing according to claim 1, wherein: a universal joint protection shell (17) is arranged on the outer side of the universal joint (12), and the bottom end of the universal joint protection shell (17) is fixedly connected with an inner flange arranged on the inner wall of the lower shell (5) through a fixing bolt; the bottom end of the universal joint protection shell (17) is movably connected with the transmission shaft (10) through a bearing.

5. The oil pumping device matched with the composite coiled tubing according to claim 1, wherein: the filter screen support is composed of a lower support ring (18), a support rod (19) and an upper support ring (20), wherein the upper support ring (20) is fixedly arranged on the lower support ring (18) through the support rod (19); the lower support ring (18) is respectively welded with the lower shell (5) and the bottom end of the filter screen (11), and the lower support ring (18) is also fixedly connected with the universal joint protective shell (17) through a fixing bolt; the upper supporting ring (20) is respectively welded with the top ends of the upper shell (4) and the filter screen (11), and the upper supporting ring (20) is fixedly connected with the stator (701) through a fixing bolt.

6. The oil pumping device matched with the composite coiled tubing according to claim 1, wherein: the submersible motor is characterized in that a motor flange (21) is mounted on the lower shell (5) on the outer side of the submersible motor (6) through a fixing bolt, a motor protection shell (22) is arranged on the motor flange (21), and the motor protection shell (22) is connected with the submersible motor (6) in a sleeved mode.

Technical Field

The invention relates to an oil pumping device, in particular to an oil pumping device matched with a composite continuous oil pipe.

Background

Among the current mechanical oil extraction modes in China, the most widely applied mode is an electric submersible pump and a rod pump, and along with the fact that the water content of an oil field is higher and higher in the later stage of oil reservoir development, more and more high-sand-content gas wells and heavy oil wells are provided, a plurality of problems are brought to the oil wells using the rod pumps and the electric submersible centrifugal pumps. The rod pump belongs to rod pumping equipment, and has the problems of tripping, short rod and deflection, the problem that the pumping unit is difficult to descend frequently occurs in a high-load well, and the problem that the pumping unit is stuck by sand frequently occurs in a high-sand-content well. Although the electric submersible centrifugal pump belongs to rodless oil production equipment and has the characteristic of large discharge capacity, the electric submersible centrifugal pump is sensitive to gas and sand, and the rotating blades of the electric submersible centrifugal pump are high in speed and easy to wear, so that the service life of the electric submersible centrifugal pump is short.

Meanwhile, the oil quantity and the viscosity of the oil are constantly changed in the oil extraction process, and when the oil accumulation speed of the oil reservoir is insufficient or the viscosity of the oil reservoir is too high, the oil extraction pump is easy to idle or not rotate, so that the oil extraction pump is easy to damage. Therefore, it is necessary to invent an oil pumping device and a control method thereof for matching with a composite coiled tubing to solve the above problems.

Disclosure of Invention

The invention aims to: the oil pumping device matched with the composite continuous oil pipe has the advantages of high oil extraction efficiency, wear resistance, capability of regulating the rotating speed in the oil extraction process, protection, and prolonged service life, and solves the problems of tripping, short rod, deviation, easy wear and low service life of the existing oil extraction pump.

The technical scheme of the invention is as follows:

an oil pumping device matched with a composite coiled tubing comprises an uphole component and an downhole component, wherein the uphole component is connected with the downhole component through the composite coiled tubing; the aboveground part comprises a Christmas tree and a control cabinet; the method is characterized in that: the underground part comprises an upper shell, a lower shell, an oil-submersible motor and a screw pump body, wherein the lower shell is arranged at the bottom of the upper shell, the oil-submersible motor is arranged in the lower shell, and the oil-submersible motor is electrically connected with the control cabinet through a relay; the output shaft of the submersible motor is provided with a transmission shaft through a speed reducer; a screw pump body is arranged in the upper shell, a filter screen is arranged between the upper shell and the lower shell through a filter screen bracket, and an inlet of the screw pump body is communicated with the outside through the filter screen; the screw pump body consists of a stator and a screw rotor, the screw rotor is inserted in the stator, and the screw rotor is connected with the transmission shaft through a universal joint; the submersible motor is also provided with a rotating speed sensor, the outer side of the filter screen is provided with a flow speed sensor, and the flow speed sensor and the rotating speed sensor are respectively and electrically connected with the control cabinet.

And the end surface of the outlet of the stator is provided with a continuous oil pipe connector through an outlet flange, and the continuous oil pipe connector is communicated with the Christmas tree through a composite continuous oil pipe.

The composite continuous oil pipe is composed of a continuous pipe, a protective layer and connecting cables, wherein the protective layer wraps the outer wall of the continuous pipe, and the connecting cables are uniformly distributed in the protective layer in an annular manner; the coiled tubing is respectively communicated with the coiled tubing connector and the Christmas tree; the control cabinet is respectively connected with the relay, the flow velocity sensor and the rotating speed sensor through connecting cables.

A universal joint protection shell is arranged on the outer side of the universal joint, and the bottom end of the universal joint protection shell is respectively and fixedly connected with an inner flange arranged on the inner wall of the lower shell through a fixing bolt; the bottom end of the universal joint protection shell is movably connected with the transmission shaft through a bearing.

The filter screen support consists of a lower support ring, a support rod and an upper support ring, wherein the upper support ring is fixedly arranged on the lower support ring through the support rod; the lower support ring is respectively welded with the lower shell and the end head of the bottom of the filter screen, and is also fixedly connected with the universal joint protective shell through a fixing bolt; the upper supporting ring is respectively welded with the upper shell and the top end of the filter screen, and is fixedly connected with the stator through a fixing bolt.

The submersible motor is characterized in that a motor flange is mounted on the lower shell on the outer side of the submersible motor through a fixing bolt, a motor protection shell is arranged on the motor flange, and the motor protection shell is connected with the submersible motor in a sleeved mode.

The invention has the beneficial effects that:

the oil pumping device matched with the composite continuous oil pipe does not use a sucker rod, so that the oil pumping device is not easy to trip, short and deviated, and does not use a centrifugal blade, so that the oil pumping device can resist abrasion and prolong the service life; the submersible motor and the rotation speed sensor are matched with the flow velocity sensor, so that the submersible motor and the screw pump body can intelligently adjust the speed according to different well conditions underground, the optimal rotation speed is achieved, the service life is prolonged, and the oil extraction rate is effectively increased; meanwhile, the use of the relay is matched, so that the power-off protection can be carried out on the submersible motor, the damage caused by idling or non-rotation is avoided, and the service life is further prolonged; the problems of tripping, short rod, deflection, easy abrasion and short service life of the existing oil extraction pump are solved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a screw pump body of the present invention;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

FIG. 4 is an enlarged schematic view at B in FIG. 2;

FIG. 5 is a schematic structural view of the composite coiled tubing of the present invention;

fig. 6 is a control schematic block diagram of the present invention.

In the figure: 1. the composite coiled tubing comprises a coiled tubing body, a protective layer, a connecting cable, a Christmas tree, a control cabinet, an upper shell body, a lower shell body, a screw pump body, a motor, a submersible motor, a screw pump body, a stator 701, a stator 702, a screw rotor, a relay 8, a speed reducer 9, a speed reducer 10, a transmission shaft 11, a filter screen 12, a universal joint 13, a rotation speed sensor 14, a flow speed sensor 15, an outlet flange 16, a coiled tubing connector 17, a universal joint protective shell 18, a lower support ring 19, a support rod 20, an upper support ring 21, a motor flange 22 and a motor protective shell.

Detailed Description

The oil pumping device matched with the composite coiled tubing comprises an uphole part and an underground part, wherein the uphole part is connected with the underground part through the composite coiled tubing 1; the aboveground part comprises a Christmas tree 2 and a control cabinet 3; the composite coiled tubing 1 consists of a coiled tubing 101, a protective layer 102 and connecting cables 103, wherein the protective layer 102 is wrapped on the outer wall of the coiled tubing 101, and the connecting cables 103 are uniformly distributed in the protective layer 102 in an annular manner; the function of the continuous pipe 101 is to convey collected oil liquid to the ground from the underground during working; the protective layer 102 is used for isolating and protecting the coiled tubing 101 and the connecting cable 103 to prevent the coiled tubing 101 and the connecting cable 103 from being damaged by the severe downhole environment (high temperature and high pressure), and also used for insulating and protecting the connecting cable 103 to prevent short circuit between the connecting cables 103 or connection between the connecting cable 103 and downhole oil.

The underground part comprises an upper shell 4, a lower shell 5, an oil-submersible motor 6 and a screw pump body 7, wherein the lower shell 5 is arranged at the bottom of the upper shell 4, the oil-submersible motor 6 is arranged in the lower shell 5, the oil-submersible motor 6 is a stepless speed regulating motor, the oil-submersible motor 6 is electrically connected with a control cabinet 3 through a relay 8, and the relay 8 is used for controlling the connection and disconnection of the oil-submersible motor 6 and a power supply, so that the rotation of the oil-submersible motor 6 is controlled, the oil-submersible motor 6 is protected, and the service life is prolonged; a motor flange 21 is installed on the lower shell 5 outside the submersible motor 6 through a fixing bolt, a motor protection shell 22 is arranged on the motor flange 21, the motor protection shell 22 is connected with the submersible motor 6 in a sleeved mode, and the motor protection shell 22 is used for being matched with the motor flange 21 to fix the submersible motor 6 in the lower shell 5 and simultaneously protecting the submersible motor 6; a screw pump body 7 is arranged in the upper shell 4, a filter screen 11 is arranged between the upper shell 4 and the lower shell 5 through a filter screen support, an inlet of the screw pump body 7 is communicated with the outside through the filter screen 11, and the filter screen 11 is used for filtering impurities in oil to prevent the oil from entering the screw pump body 7, so that the screw pump body 7 is not easy to block and clamp a pump, the normal operation of the screw pump body 7 is ensured, and the normal operation of oil pumping is ensured; the screw pump body 7 is composed of a stator 701 and a screw rotor 702, and the screw rotor 702 is inserted in the stator 701; the screw pump body 7 is rotated in the stator 701 through the screw rotor 702, so that the working volume between the screw rotor 702 and the stator 701 is periodically changed, and the fluid is conveyed and pressurized, and the screw pump has the advantages of simple structure, small diameter, small flow pressure pulsation, low noise, high working speed, strong self-priming capability and long service life, and simultaneously has no problems of tripping, short rod and deflection compared with a rod pump; meanwhile, due to the development of a rubber technology, the stator lining of a key part influencing the service life and the use range of the single-screw pump is greatly improved, and compared with a centrifugal pump, the single-screw pump has the advantages of wear resistance and long service life; the output shaft of the submersible motor 6 is provided with a transmission shaft 10 through a speed reducer 9, the transmission shaft 10 is connected with the screw rotor 702 through a universal joint 12, and the universal joint 12 is used for converting the concentric motion of the submersible motor 6 into the eccentric motion required by the screw rotor 702 so that the submersible motor 6 can normally drive the screw rotor 702 to rotate; an outlet flange 15 is mounted on the outlet end face of the stator 701 through a fixing bolt, a continuous oil pipe connector 16 is mounted on the top end face of the outlet flange 15 through a fixing bolt, and the continuous oil pipe connector 16 is communicated with the Christmas tree 2 through the composite continuous oil pipe 1; specifically, the method comprises the following steps: the continuous oil pipe connector 16 is communicated with the Christmas tree 2 through a continuous pipe 101 so as to convey oil output by the screw pump body 7 to the Christmas tree 2 through the continuous pipe 101 and further convey the oil to the ground; a rotating speed sensor 13 is also arranged on the submersible motor 6, a flow velocity sensor 14 is arranged outside the filter screen 11, and the flow velocity sensor 14 and the rotating speed sensor 13 are respectively and electrically connected with the control cabinet 3; specifically, the method comprises the following steps: the control cabinet 3 is respectively connected with the relay 8, the flow velocity sensor 14 and the rotating speed sensor 13 through connecting cables 103, so that power is respectively supplied to the relay 8, the flow velocity sensor 14 and the rotating speed sensor 13 through the control cabinet, and meanwhile, oil flow velocity information at the inlet of the screw pump body 7 monitored by the flow velocity sensor 14 and rotating speed information of the submersible motor 6 monitored by the rotating speed sensor 13 are collected; the control cabinet 3 comprises an information processing module, a rotating speed control module and a relay control module (the information processing module, the rotating speed control module and the relay control module are all commercially available products), the information processing module is respectively connected with the flow velocity sensor 14, the rotating speed sensor 13, the rotating speed control module and the relay control module so as to collect and process oil flow velocity signals of the flow velocity sensor 14 and rotating speed signals of the submersible motor of the rotating speed sensor 13, and the rotating speed control module and the relay control module are controlled to operate according to signal processing results; the rotating speed control module is connected with the submersible motor 6 to control the rotating speed of the submersible motor 6 according to the processing result of the signal processing module; the relay control module is connected with the relay 8 to process result control relay 8 according to the signal processing module, and then the break-make of the oily motor 6 power of control dive, the oily motor 6 of protection dive, simultaneously through the rotation of the oily motor 6 of control dive, the rotation of control screw pump body 7, thereby prevent that screw pump body 7 from idling or gluing because of fluid and changeing motionlessly, protect screw pump body 7 from this, prolong its life.

A universal joint protection shell 17 is arranged on the outer side of the universal joint 12, and the bottom end of the universal joint protection shell 17 is respectively and fixedly connected with an inner flange arranged on the inner wall of the lower shell 5 through a fixing bolt; the bottom end of universal joint protective housing 17 passes through bearing and transmission shaft 10 swing joint to carry on spacingly to universal joint 12 and transmission shaft 10, and then protect it.

The filter screen bracket consists of a lower support ring 18, a support rod 19 and an upper support ring 20, wherein the lower support ring 18 is fixedly provided with the upper support ring 20 through the support rod 19; the lower support ring 18 is respectively welded with the lower shell 5 and the end head at the bottom of the filter screen 11, and the lower support ring 18 is also fixedly connected with the universal joint protection shell 17 through a fixing bolt; the upper support ring 20 is respectively welded with the upper shell 4 and the top end of the filter screen 11, and the upper support ring 20 is also fixedly connected with the stator 701 through a fixing bolt; the filter screen support is used for supporting the filter screen 11 so as to prevent the filter screen from deforming under the action of pressure, and meanwhile, the universal joint protection shell 17 and the stator 701 are positioned.

When the oil pumping device matched with the composite continuous oil pipe works, the relay is started through the relay control module of the control cabinet 3, so that the submersible motor 6 is connected with a power supply, and after the submersible motor 6 is connected with the power supply, the submersible motor 6 drives the screw rotor 702 of the screw pump body 7 to rotate through the speed reducer 9, the transmission shaft 10 and the universal joint 12 in sequence; the screw rotor 702 is matched with the stator 701 to extract oil outside the upper shell 4 and the lower shell 5 in the rotating process, so that the oil is filtered by the filter screen 11 and then enters the screw pump body 7; the oil liquid entering the screw pump body 7 is pressurized by the screw pump body 7 and then is conveyed to the Christmas tree 2 through the outlet flange 15, the continuous oil pipe connector 16 and the continuous pipe 101 of the composite continuous oil pipe 1 in sequence, and further conveyed to the ground.

During the rotation of the screw rotor 702, the information processing module of the control cabinet 3 collects the oil flow rate information of the flow rate sensor 14 and the rotation speed information of the submersible motor 6 of the rotation speed sensor 13.

After information acquisition, the information processing module is handled fluid velocity of flow information and the oily motor 6 rotational speed information of diving, controls oily motor 6 according to the information processing result to the oily motor 6 of protection and screw pump body 7 of diving, the control rule specifically is:

when the rotating speed of the submersible motor 6 is 0, namely the oil is too viscous, the screw rotor 702 of the screw pump body 7 is caused to rotate and stop, and further the submersible motor 6 is caused to rotate and stop, the information processing module sends a signal to the relay control module, so that the relay control module controls the relay 8 to disconnect the submersible motor 6 from the power supply, and the submersible motor 6 is caused to stop power failure;

when the rotating speed of the submersible motor 6 is not 0 and the flow velocity of oil is 0, namely the oil accumulation speed of an oil reservoir is insufficient, the oil cannot enter the inlet of the screw pump body 7 through the filter screen, so that the screw rotor 702 idles, the information processing module sends a signal to the relay control module, so that the relay control module controls the relay 8 to disconnect the submersible motor 6 from a power supply, and the submersible motor 6 is powered off and stops;

when the rotational speed of the submersible motor 6 is not 0, and the flow rate of oil is not 0, the information processing module controls the rotational speed of the submersible motor 6 through the rotational speed control module according to the flow rate of oil, so as to control the rotational speed of the screw rotor 702, so that the flow rate of oil is matched with the rotational speed, and the rotational speed of the screw rotor 702 is determined according to the following formula:

wherein:indicating that the screw rotor 702 has rotated one revolution,；which is indicative of the rotational speed of the screw rotor 702,；the inlet oil flow rate is shown as,；the pitch of the screw rotor 702 is shown,；for the flow area (i.e. the difference in cross-section between the stator 701 and the screw rotor 702),；the number of screw heads is divided into a single-head screw and a multi-head screw for the screw rotor 702, and the number of screw heads is recorded asThe number of the heads of the stator 701 is。

When the rotation speed control module controls the rotation speed of the submersible motor 6, the information processing module controls the rotation speed of the submersible motor 6 in a closed loop mode through oil flow speed information and rotation speed information, and when the oil flow speed is too high, the submersible motor 6 is controlled to accelerate, so that the oil is pumped out in an accelerated mode through the screw pump body 7, and the oil extraction efficiency is improved; when the oil flow velocity is too low, the submersible motor 6 is controlled to decelerate, and the phenomenon that the oil gathering speed is insufficient, so that the screw rotor 702 of the screw pump body 7 idles, and the screw pump body 7 and the submersible motor 6 are protected.

After the power failure of the submersible motor 6 stops, the information processing module controls the relay 8 to restore power supply to the submersible single machine 6 through the relay control module after the time T, so that the submersible motor 6 is restarted, oil extraction operation is restored, and the time T is determined through the following formula:

wherein: k is a coefficient; h is the depth of the screw pump body 7 in the underground, m.

The oil pumping device matched with the composite continuous oil pipe does not use a sucker rod, so that the oil pumping device is not easy to trip, short and deviated, and does not use a centrifugal blade, so that the oil pumping device can resist abrasion and prolong the service life; the submersible motor 6, the rotating speed sensor 13 and the flow velocity sensor 14 are matched for use, so that the submersible motor 6 and the screw pump body 7 can carry out intelligent speed regulation according to different well conditions underground, the optimal rotating speed is reached, the service life is prolonged, and the oil extraction rate is effectively increased; meanwhile, the use of the relay is matched, so that the power-off protection can be carried out on the submersible motor, the damage caused by idling or non-rotation is avoided, and the service life is further prolonged; the problems of tripping, short rod, deflection, easy abrasion and short service life of the existing oil extraction pump are solved.