Cable dropping and fishing type small-diameter submersible reciprocating two-way pump device and using method

Abstract

The invention relates to the technical field of oil extraction pumps, in particular to a cable throwing and fishing type small-diameter oil-submersible reciprocating two-way pump device and a using method, and the cable throwing and fishing type small-diameter oil-submersible reciprocating two-way pump device comprises a two-way oil well pump and an oil-submersible linear motor. The device is reasonable and compact in structure and convenient to use, the submersible linear motor is connected with the lower end of the two-way oil well pump through the screen pipe and then connected with the ground control cabinet through the throwing and fishing cable, and the ground control cabinet controls the rotor of the underground linear motor to do up-down reciprocating intermittent motion, push-pull of the plunger of the two-way oil well pump and up-down stroke two-way oil extraction of the pump. The problems that an existing one-way pump extracts oil in the upstroke and does not extract oil in the downstroke, consequently, empty running occurs in the downstroke of a linear motor, and energy is wasted are solved, and tests prove that the two-way oil well pump saves electricity by more than 25% compared with the one-way oil well pump; and the outer diameter of the small-diameter submersible linear motor is more adaptive to that of a small-inner-diameter sleeve in the oil shale horizontal well, so that low-submergence deep pumping of shale oil is efficiently realized.

Description

Technical Field

[0001] The invention relates to the technical field of oil production pumps, in particular to a cable casting and fishing type small-diameter submersible reciprocating bidirectional pump device and a use method thereof. Background Art

[0002] With the large-scale development of shale oil in China, the depletion development method is adopted, and the daily liquid production of oil wells decreases rapidly. On average, about 800 days after the pumping, the dynamic liquid level of the oil well will drop to 2300m. At present, due to the limited motor power and head, and the high requirements for liquid supply capacity, the maximum pumping depth of the existing ordinary oil production pumps can only reach 2500m, which will not be able to meet the low submergence deep pumping requirements in the later stage of shale oil horizontal well production. Although the existing submersible reciprocating pump device has an effective head of more than 3500m, it uses a 114mm submersible direct drive motor, which can only be used for lifting oil wells with an inner diameter of casing above 124mm. Shale oil horizontal wells use 115.5mm casing completion, and conventional submersible direct drive motors cannot be used. Summary of the invention

[0003] The present invention provides a cable-casting type small-diameter submersible reciprocating bidirectional pump device and a method of use, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that the existing submersible reciprocating pump device cannot be used in the existing shale oil horizontal well mining process due to the small inner diameter of the casing.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a cable-casting type small-diameter submersible reciprocating bidirectional pump device, comprising a bidirectional oil pump and a submersible linear motor, a sensor short section capable of monitoring the downhole environment being detachably mounted on the left end of the bidirectional oil pump, an electrical connector capable of connecting the casting cable being detachably mounted on the left end of the sensor short section; a liquid inlet screen capable of circulating oil inside and outside being detachably mounted on the inner side of the right end of the bidirectional oil pump, a submersible linear motor being detachably mounted on the outer side of the right end of the liquid inlet screen, a mover of the submersible linear motor passing through the right and middle parts of the liquid inlet screen and fixedly mounted on the outer side of the right end of a coupling, a connecting hole opening to the left being provided on the left side of the coupling, the inner side of the left part of the connecting hole being fixedly mounted on the outer side of the right end of a hollow pump rod of the bidirectional oil pump, a liquid inlet whose inner end can be connected to the right part of the connecting hole being provided on the outer side of the coupling corresponding to the right side position of the hollow pump rod of the bidirectional oil pump; the submersible linear motor and the sensor short section are both electrically connected to the electrical connector.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned sensor pup joint may include a threaded pup joint and a sensor group. The outer side of the right end of the threaded pup joint is screwed together with the inner side of the left end of the two-way oil pump. The outer side of the left end of the threaded pup joint is screwed together with the inner side of the right end of the electrical connector. A sensor group capable of monitoring pressure and temperature is fixedly installed in the threaded pup joint. A liquid flow channel capable of allowing oil to flow axially along the threaded pup joint is provided between the sensor group and the threaded pup joint.

[0006] The above-mentioned device may also include a centralizer, and a centralizer is arranged at the right end of the submersible linear motor.

[0007] The outer side of the left end of the above-mentioned liquid inlet screen tube can be screwed together with the inner side of the right end of the bidirectional oil pump, and the outer side of the right end of the liquid inlet screen tube can be screwed together with the inner side of the left end of the submersible linear motor. The liquid inlet screen tube corresponding to the position between the bidirectional oil pump and the submersible linear motor can be provided with a plurality of liquid inlet holes that penetrate inside and outside.

[0008] The bidirectional oil pump may be two tubular plunger pump sets of different diameters connected in series.

[0009] One of the technical solutions of the present invention is achieved through the following measures: a method for using a cable-casting type small-diameter submersible reciprocating bidirectional pump device, which is carried out according to the following method: in the first step, the casting cable is first passed through the oil pipe and then connected to the electrical connector, and then the electrical connector is connected to the end of the oil pipe; in the second step, the submersible reciprocating bidirectional pump is lowered into the well through the oil pipe and centered by the centralizer; in the third step, the oil production operation is started, when the mover pushes the hollow pump rod to the left, oil pressure is generated in the upper chamber of the pump barrel of the bidirectional oil pump, the floating valve in the bidirectional oil pump is closed, the two fixed valves in the bidirectional oil pump are pushed open, and part of the oil in the upper chamber of the pump barrel is The plunger in the two-way oil pump is lifted into the oil pipe, and the remaining oil enters the annular space between the pump barrel and the plunger through the oil inlet hole on the pump barrel. When the mover pulls the hollow pump rod back to the right, the oil in the annular space pushes open the fixed valve and enters the oil pipe, and negative pressure is generated in the upper chamber of the pump barrel. The fixed valve is closed, and the floating valve is opened. The oil in the well flows into the upper chamber of the pump barrel through the liquid inlet hole on the liquid inlet screen, the liquid inlet port on the coupling, and the inner chamber of the hollow pump rod in turn; the fourth step is to repeat step three, and the hollow pump rod of the two-way oil pump is pushed and pulled back and forth by the mover on the submersible linear motor to complete the two-way oil production. During the oil production process, the pressure and temperature in the well are monitored in real time through the sensor short energy saving.

[0010] The invention has a reasonable and compact structure and is easy to use. The submersible linear motor is connected to the lower end of the bidirectional oil pump through a screen pipe, and then connected to the ground control cabinet through a salvage cable. The ground control cabinet controls the mover of the downhole linear motor to make up and down reciprocating intermittent motion, push and pull the plunger of the bidirectional oil pump, and the pump produces oil in both directions during the up and down strokes, which solves the problem of the existing unidirectional pump that the upstroke produces oil but the downstroke does not produce oil, causing the linear motor to run empty during the downstroke and waste energy. Experiments have proved that the bidirectional oil pump saves more than 25% of electricity than the unidirectional oil pump; the outer diameter of the small-diameter submersible linear motor is more compatible with the small inner diameter casing in the oil shale horizontal well, so that the invention can realize rodless oil production in the small inner diameter casing horizontal well below 2500 meters, and efficiently realizes the low-submergence deep extraction of shale oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 It is a schematic diagram of the main view of the partial cross-section structure of the upper half of Embodiment 1-6 of the present invention.

[0012] Attached Figure 2 It is a schematic diagram of the main view of the partial cross-section structure of the middle part of Embodiment 1-6 of the present invention.

[0013] Attached Figure 3 It is a schematic diagram of the main structure of the lower half of Embodiment 1-6 of the present invention.

[0014] Attached Figure 4 It is a reduced schematic diagram of the main structure of Embodiment 1-6 of the present invention.

[0015] The codes in the attached drawings are: 1 is a bidirectional oil well pump, 2 is a submersible linear motor, 3 is an electrical connector, 4 is a liquid inlet screen, 5 is a mover, 6 is a coupling, 7 is a connecting hole, 8 is a hollow pump rod, 9 is a liquid inlet, 10 is a threaded short section, 11 is a sensor group, 12 is a centralizer, 13 is a liquid inlet hole, 14 is a labor cable, 15 is an oil pipe, and 16 is a liquid flow channel. DETAILED DESCRIPTION

[0016] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0017] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0018] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1-4As shown, the cable-casting type small-diameter submersible reciprocating bidirectional pump device comprises a bidirectional oil pump 1 and a submersible linear motor 2. A sensor short section capable of monitoring the downhole environment is detachably mounted on the left end of the bidirectional oil pump 1, and an electrical connector 3 capable of connecting the casting cable is detachably mounted on the left end of the sensor short section; a liquid inlet screen 4 capable of circulating oil inside and outside is detachably mounted on the inner side of the right end of the bidirectional oil pump 1, and a submersible linear motor 2 is detachably mounted on the outer side of the right end of the liquid inlet screen 4, and a mover 5 of the submersible linear motor 2 is fixedly mounted together with the outer side of the right end of a coupling 6 after passing through the right and middle parts of the liquid inlet screen 4, a connecting hole 7 opening to the left is provided on the left side of the coupling 6, and the inner side of the left part of the connecting hole 7 is fixedly mounted together with the outer side of the right end of a hollow pump rod 8 of the bidirectional oil pump 1, and a liquid inlet 9 whose inner end can be connected to the right part of the connecting hole 7 is provided on the outer side of the coupling 6 corresponding to the right side position of the hollow pump rod 8 of the bidirectional oil pump 1; the submersible linear motor 2 and the sensor short section are both electrically connected to the electrical connector 3.

[0019] By such arrangement, the electrical connector 3 can be connected with the casting and fishing cable and the oil pipe 15, so that the device can be quickly lowered into the predetermined position in the well through the oil pipe 15; since the mover 5 and the hollow pump rod 8 are connected together by the coupling 6 provided with the liquid inlet 9, when the mover 5 reciprocates left and right, the hollow pump rod 8 can be pushed and pulled left and right, so that the bidirectional oil pump 1 has oil always pressed into the oil pipe 15 within the telescopic stroke of the mover 5 of the submersible linear motor 2, so as to realize the reciprocating bidirectional oil production operation; the submersible linear motor 2 is located on the right side of the bidirectional oil pump 1 (in the vertical direction, it is equivalent to the submersible linear motor 2 being at the bottom of the bidirectional oil pump 1), which is equivalent to the inverted ordinary tubular pump. At this time, the fixed valve (also called the fixed valve) in the bidirectional oil pump 1 is located on the left side of its plunger, forming a It is the discharge valve of the two-way oil pump 1, and the floating valve (also called the floating valve) becomes the suction valve of the pump, which effectively improves the working efficiency of the two-way oil pump 1, enables the submersible linear motor 2 to work intermittently, has a long liquid filling time, a good filling degree, and no stroke loss of the pump; the stator of the submersible linear motor 2 can generate a strong magnetic force, which drives the mover 5 to reciprocate left and right at the required speed under the command of the ground control cabinet, so that the hollow pump rod 8 of the two-way oil pump 1 can reciprocate left and right, thereby lifting the downhole oil to the ground; the downhole oil can pass through the liquid inlet screen 4, the liquid inlet 9, the connecting hole 7 and the inner cavity of the hollow pump rod 8 in sequence and flow into the two-way oil pump 1; the labor cable 14 can supply power to the sensor short section and the submersible linear motor 2 or transmit control signals through the electrical connector 3.

[0020] According to the requirements, the submersible linear motor 2 is a small-diameter submersible linear motor 2, and its outer diameter can be well matched with the small inner diameter casing in the shale oil horizontal well, so as to reliably and efficiently lift the oil in the shale horizontal well to the outside of the well. It can better adapt to the high temperature and high pressure environment in the oil shale horizontal well below 2500 meters, and has better heat resistance and sealing. It can be realized by the WFQYDB-96 series linear motor of Shenyang Xincheng Petroleum Machinery Manufacturing Co., Ltd. in the prior art; the bidirectional oil pump 1 can be realized by the double-acting pump in the prior art or the special series plunger pump, etc.; the electrical connector 3 can be realized by a coupling with a terminal block or a waterproof male and female connector; the sensor in the sensor short section can monitor the temperature, pressure and depth of the dynamic liquid level and other parameters in the well, and provide reference data for fault warning.

[0021] The present invention has a reasonable and compact structure and is easy to use. The submersible linear motor 2 is connected to the lower end of the bidirectional oil pump 1 through a screen pipe, and then connected to the ground control cabinet through a salvage cable. The ground control cabinet controls the mover 5 of the downhole linear motor to make up and down reciprocating intermittent motion, push and pull the plunger of the bidirectional oil pump 1, and the pump produces oil in both directions during the up and down strokes, which solves the problem of the existing unidirectional pump that the upstroke produces oil but the downstroke does not produce oil, causing the linear motor to run empty during the downstroke and waste energy. Experiments have proved that the bidirectional oil pump 1 saves more than 25% of electricity than the unidirectional oil pump; the outer diameter of the small-diameter submersible linear motor 2 is more compatible with the small inner diameter casing in the oil shale horizontal well, so that the present invention can realize rodless oil production in the small inner diameter casing horizontal well below 2500 meters, and efficiently realizes the low-submergence deep extraction of shale oil.

[0022] According to actual needs, the above-mentioned cable-type small-diameter submersible reciprocating bidirectional pump device can be further optimized and / or improved: Embodiment 2: As attached Figure 1-4 As shown, the sensor nipple includes a threaded nipple 10 and a sensor group 11. The outer side of the right end of the threaded nipple 10 is screwed together with the inner side of the left end of the two-way oil pump 1, and the outer side of the left end of the threaded nipple 10 is screwed together with the inner side of the right end of the electrical connector 3. The sensor group 11 capable of monitoring pressure and temperature is fixedly installed in the threaded nipple 10, and a liquid flow channel 16 capable of allowing oil to flow axially along the threaded nipple 10 is provided between the sensor group 11 and the threaded nipple 10.

[0023] Through such an arrangement, the sensor group 11 can continuously monitor the downhole temperature, pressure and other environmental conditions to provide a guarantee for safe oil production; the downhole oil can flow into the oil pipe 15 through the liquid flow channel 16.

[0024] Embodiment 3: As attached Figure 1-4 As shown, a centralizer 12 is also included. The right end of the submersible linear motor 2 is provided with the centralizer 12.

[0025] By such arrangement, the centralizer 12 can better centralize the present invention.

[0026] Embodiment 4: As attached Figure 1-4 As shown, the outer side of the left end of the liquid inlet screen tube 4 is screwed together with the inner side of the right end of the bidirectional oil pump 1, and the outer side of the right end of the liquid inlet screen tube 4 is screwed together with the inner side of the left end of the submersible linear motor 2. The liquid inlet screen tube 4 corresponding to the position between the bidirectional oil pump 1 and the submersible linear motor 2 is provided with a plurality of liquid inlet holes 13 that penetrate inside and outside.

[0027] By such arrangement, the downhole oil can quickly enter the screen tube through the liquid inlet hole 13 , and the large sand particles and other impurities in the downhole oil can be filtered out to prevent the impurities from clogging the bidirectional oil pump 1 .

[0028] Embodiment 5: As attached Figure 1-4 As shown, the bidirectional oil well pump 1 is composed of two tubular plunger pump groups of different diameters connected in series.

[0029] By such an arrangement, it can be ensured that the mover 5 of the submersible linear motor 2 can deliver oil into the oil pipe 15 during the left and right extension process, thereby greatly improving the oil production efficiency.

[0030] Embodiment 6: As attached Figure 1-4 As shown, a method for using a cable-casting type small-diameter submersible reciprocating bidirectional pump device is performed as follows: first, the casting cable 14 is passed through the oil pipe 15 and then connected to the electrical connector 3, and then the electrical connector 3 is connected to the end of the oil pipe 15; second, the submersible reciprocating bidirectional pump is lowered into the well through the oil pipe 15, and is centered by the centralizer 12; third, the oil production operation is started, when the mover 5 pushes the hollow pump rod 8 to the left, oil pressure is generated in the upper chamber of the pump barrel of the bidirectional oil pump 1, the floating valve in the bidirectional oil pump 1 is closed, the two fixed valves in the bidirectional oil pump 1 are pushed open, and part of the oil in the upper chamber of the pump barrel is driven by the plunger in the bidirectional oil pump 1 Lifted into the oil pipe 15, the remaining oil enters the annular space between the pump barrel and the plunger through the oil inlet hole on the pump barrel. When the mover 5 pulls the hollow pump rod 8 back to the right, the oil in the annular space pushes open the fixed valve and enters the oil pipe 15, and negative pressure is generated in the upper chamber of the pump barrel. The fixed valve is closed, and the floating valve is opened. The oil in the well flows into the upper chamber of the pump barrel through the liquid inlet hole 13 on the liquid inlet screen 4, the liquid inlet port 9 on the coupling 6, and the inner cavity of the hollow pump rod 8 in turn; the fourth step is to repeat step three, and the mover 5 on the submersible linear motor 2 reciprocates to push and pull the hollow pump rod 8 of the bidirectional oil pump 1 to complete bidirectional oil production. During the oil production process, the pressure and temperature in the well are monitored in real time through the sensor short energy saving.

[0031] By using the above method to produce oil, bidirectional oil production can be achieved in the small inner diameter casing of the oil shale horizontal well by the up and down strokes of the pump, which effectively improves the efficiency of the oil production operation, reduces the energy waste of the submersible linear motor 2, and effectively saves the oil production cost.

[0032] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A cable-casting type small-diameter submersible reciprocating bidirectional pump device, characterized in that It comprises a bidirectional oil pump and a submersible linear motor. A sensor short section capable of monitoring the downhole environment is detachably mounted on the left end of the bidirectional oil pump, and an electrical connector capable of connecting a salvaging cable is detachably mounted on the left end of the sensor short section. A liquid inlet screen capable of circulating oil inside and outside is detachably mounted on the inner side of the right end of the bidirectional oil pump, and a submersible linear motor is detachably mounted on the outer side of the right end of the liquid inlet screen. The left end of the mover of the submersible linear motor passes through the right and middle parts of the liquid inlet screen and is fixedly mounted on the outer side of the right end of the coupling. A connecting hole opening to the left is arranged on the left side of the coupling, and the inner side of the left part of the connecting hole is fixedly mounted on the outer side of the right end of the hollow pump rod of the bidirectional oil pump. A liquid inlet whose inner end can be connected to the right part of the connecting hole is arranged on the outer side of the coupling corresponding to the right side of the hollow pump rod of the bidirectional oil pump. The submersible linear motor and the sensor short section are both electrically connected to the electrical connector.

2. The cable-casting type small-diameter submersible reciprocating bidirectional pump device according to claim 1 is characterized in that The sensor nipple includes a threaded nipple and a sensor group. The outer side of the right end of the threaded nipple is screwed together with the inner side of the left end of the two-way oil pump. The outer side of the left end of the threaded nipple is screwed together with the inner side of the right end of the electrical connector. A sensor group capable of monitoring pressure and temperature is fixedly installed in the threaded nipple. A liquid flow channel capable of allowing oil to flow axially along the threaded nipple is provided between the sensor group and the threaded nipple.

3. The cable-casting type small-diameter submersible reciprocating bidirectional pump device according to claim 1 or 2, characterized in that It also includes a centralizer, and the right end of the submersible linear motor is provided with a centralizer.

4. The cable-casting type small-diameter submersible reciprocating bidirectional pump device according to claim 1 or 2, characterized in that The outer side of the left end of the liquid inlet screen pipe is screwed together with the inner side of the right end of the bidirectional oil pump, and the outer side of the right end of the liquid inlet screen pipe is screwed together with the inner side of the left end of the submersible linear motor. The liquid inlet screen pipe corresponding to the position between the bidirectional oil pump and the submersible linear motor is provided with a plurality of liquid inlet holes that penetrate inside and outside.

5. The cable-casting type small-diameter submersible reciprocating bidirectional pump device according to claim 3 is characterized in that The outer side of the left end of the liquid inlet screen pipe is screwed together with the inner side of the right end of the bidirectional oil pump, and the outer side of the right end of the liquid inlet screen pipe is screwed together with the inner side of the left end of the submersible linear motor. The liquid inlet screen pipe corresponding to the position between the bidirectional oil pump and the submersible linear motor is provided with a plurality of liquid inlet holes that penetrate inside and outside.

6. The cable-casting type small-diameter submersible reciprocating bidirectional pump device according to claim 1, 2 or 5, characterized in that The bidirectional oil well pump is two tubular plunger pumps of different diameters connected in series.

7. The cable-casting type small-diameter submersible reciprocating bidirectional pump device according to claim 3 is characterized in that The bidirectional oil well pump is two tubular plunger pumps of different diameters connected in series.

8. The cable-casting type small-diameter submersible reciprocating bidirectional pump device according to claim 4 is characterized in that The bidirectional oil well pump is two tubular plunger pumps of different diameters connected in series.

9. A method for using the cable-casting small-diameter submersible reciprocating bidirectional pump device according to any one of claims 3 to 9, characterized in that Proceed as follows: first, pass the labor cable through the oil pipe and connect it to the electrical connector, and then connect the electrical connector to the end of the oil pipe; second, lower the submersible reciprocating bidirectional pump into the well through the oil pipe, and use the stabilizer to center it; third, start the oil production operation. When the mover pushes the hollow pump rod to the left, oil pressure is generated in the upper chamber of the pump barrel of the bidirectional oil pump, the floating valve in the bidirectional oil pump is closed, and the two fixed valves in the bidirectional oil pump are pushed open. Part of the oil in the upper chamber of the pump barrel is lifted by the plunger in the bidirectional oil pump into the oil pipe, and the remaining oil passes through The oil inlet hole on the pump barrel enters the annular space between the pump barrel and the plunger. When the mover pulls the hollow pump rod back to the right, the oil in the annular space pushes open the fixed valve and enters the oil pipe, and negative pressure is generated in the upper chamber of the pump barrel. The fixed valve is closed, and the floating valve is opened. The oil in the well flows into the upper chamber of the pump barrel through the inlet hole on the inlet screen, the inlet port on the coupling, and the inner cavity of the hollow pump rod in turn; the fourth step is to repeat step three, and the hollow pump rod of the bidirectional oil pump is pushed and pulled reciprocally by the mover on the submersible linear motor to complete bidirectional oil production. During the oil production process, the pressure and temperature in the well are monitored in real time through the sensor short energy saving.

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