A water drainage and gas production process of a submersible linear motor

Abstract

The invention discloses a submersible linear motor drainage and gas production equipment and process, comprising a submersible linear motor, one side of the submersible linear motor is connected to a plunger pump, the piston rod of the plunger pump is connected to one end of the mover of the submersible linear motor, the liquid outlet of the plunger pump is connected to an anti-buried sand settling pipe, and the bottom end of the submersible linear motor is connected to a liquid-gas separation device; the invention relates to the field of drainage and gas production technology, the submersible linear motor drainage and gas production equipment and process adopts a submersible linear motor as a power control special plunger pump to extract well fluid and oil and gas, a liquid-gas separation device is arranged at the bottom of the submersible linear motor as a liquid inlet end, so that liquid and gas enter and are separated once, and then are separated twice through the air anchor screen pipe on the submersible linear motor to realize liquid-gas diversion, and the well fluid and oil and gas are discharged respectively, the equipment structure is simple, and can adapt to a variety of harsh gas production environments.

Description

Technical Field

[0001] The invention relates to the technical field of water drainage and gas production, and in particular to a water drainage and gas production process of a submersible linear motor. Background Art

[0002] The drainage gas production technology is one of the important measures to tap the production potential of gas wells in water-containing gas reservoirs and improve the recovery rate of gas reservoirs. The drainage gas production technology is a common technical process in the development of water-driven gas fields. The main purpose of using the drainage gas production technology is to solve the problem of liquid accumulation in gas wells during gas field exploitation. In order to avoid the occurrence of liquid accumulation in gas wells and ensure the smooth progress of gas well exploitation, the drainage gas production technology is widely used in the production operations of water-driven gas fields.

[0003] The current drainage and gas production technologies mainly include optimized tubing, foam, gas lift, piston gas lift, conventional rod pumps, electric submersible pumps, jet pumps, etc. These drainage and gas production technologies each have their own advantages and disadvantages, some of which may pollute the formation, some require high formation pressure, some require sand content, some require a large amount of liquid, and they cannot flexibly respond to different bottom environments.

[0004] At present, there is also a way to produce gas by using submersible electric pumps. The submersible electric pump can guide the mixed fluid through the central cavity of the mover, so the requirement for the sand content of the well fluid is relatively low, which greatly improves the convenience of gas production in gas wells with large liquid volume and high sand content, increases the service life of the equipment, and reduces the maintenance work of the equipment.

[0005] However, in the gas production process, the following problems often exist. First, in the existing submersible electric pump for gas production, liquid flow and air flow are mixed and delivered. On the one hand, they need to be separated on the ground, and gas cannot be produced quickly, which makes the gas production steps cumbersome. Secondly, the power of the submersible electric pump comes from the submersible linear motor. The mover of the submersible linear motor reciprocates and impacts the casing. The casings on both sides of the submersible motor often do not have buffer devices for buffering. After a long period of operation, the mover is easily damaged by the impact with both ends of the casing of the submersible motor, and it does not play a buffering role. In view of this, in-depth research was conducted on the above-mentioned problems, and this case was created. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a water drainage and gas production process for a submersible linear motor, which solves the problems of the prior art.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a submersible linear motor water drainage and gas production equipment, comprising a submersible linear motor, one side of the submersible linear motor is connected to a plunger pump, a piston rod of the plunger pump is connected to one end of a mover of the submersible linear motor, a liquid outlet end of the plunger pump is connected to an anti-buried sand settling pipe, and the bottom end of the submersible linear motor is connected to a liquid-gas separation device;

[0008] The anti-buried sand settling pipe is connected to the liquid outlet end of the plunger pump, and is used to prevent the sand well from blocking the fixed valve group and failing to work normally due to sand settling after the well is stopped;

[0009] The plunger pump is a special plunger structure and its piston rod is connected to the submersible linear motor. The plunger pump uses axial transportation of well fluid and a pair of fixed valve groups are arranged at both ends of the plunger pump.

[0010] The submersible linear motor is composed of a connecting housing, a mover installed in the connecting housing, and a multi-stage stator fixed on the connecting housing. The mover in the connecting housing is connected to the piston rod of the plunger pump. A pair of buffer structures are arranged at both ends of the connecting housing.

[0011] The liquid-gas separation device corresponds to the gas production formation, and the well fluid and gas are separated once through the partition in the liquid-gas separation device, and a gas production cleaning structure is arranged at the bottom of the liquid-gas separation device, and the gas production cleaning structure is linked with the submersible linear motor to clean the partition;

[0012] The bottom of the liquid-gas separation device is connected with a packer, which is located at the bottom of the gas production equipment and is used to seal in the gas production casing, thereby fixing the position of the liquid-gas separation device;

[0013] An air anchor screen pipe is connected between the plunger pump and the submersible linear motor, and the air anchor screen pipe is used for secondary separation of oil and gas.

[0014] The connecting housing of the submersible linear motor is a housing with a cylindrical structure, the multi-stage stator in the connecting housing is arranged in a unidirectional array along the axial direction of the connecting housing, and the mover is a pipe with a central cavity structure.

[0015] The exterior of the liquid-gas separation device is composed of a liquid-gas inlet pipe and an exhaust screen pipe, the liquid-gas inlet pipe is axially connected to the exhaust screen pipe, the liquid-gas inlet pipe is connected to a first lower joint, the exhaust screen pipe is connected to a first upper joint, a one-way valve group is provided on the first upper joint and is connected to the mover of the submersible linear motor, a liquid-gas separation screen pipe is coaxially arranged in the liquid-gas inlet pipe, the top of the liquid-gas separation screen pipe is a bucket-shaped structure combined with the inner wall of the liquid-gas inlet pipe, a pump suction pipe is connected to the one-way valve group and extends to the bottom of the liquid-gas separation screen pipe and has a spacing of 1-3 cm from the first lower joint;

[0016] The bottom end of the liquid-gas inlet pipe is provided with a plurality of liquid-gas inlets in a circular array, and the top end of the liquid-gas separation screen pipe is provided with a plurality of liquid-gas separation screen holes in a circular array.

[0017] The packer is sleeved at the connection between the liquid and gas inlet pipe and the exhaust screen pipe. The liquid and gas inlet pipe and the exhaust screen pipe are integrated pipes, and exhaust screen holes and liquid and gas inlets are respectively provided at the upper and lower ends.

[0018] The anti-buried sand settling pipe includes a pipe sleeve, the upper and lower ends of the pipe sleeve are connected with a second upper joint and a second lower joint, the inner cavity channel of the second lower joint is connected with an inner separation pipe, the end of the inner separation pipe is connected with an inner joint, the inner joint is connected with an outer anti-sinking pipe, the outer anti-sinking pipe is coaxially arranged with the inner separation pipe, the outer anti-sinking pipe extends to above the second lower joint, and a spacing distance of 1-3 cm is set between the outer anti-sinking pipe and the second lower joint.

[0019] The buffer structure includes a limiting sleeve, which is assembled at the end of the connecting casing. A sleeve groove with an inverted cone structure is provided at the top of the limiting sleeve. A through groove with a columnar structure is integrally connected to the bottom of the sleeve groove and extends into the inner cavity of the connecting casing. The through groove is provided with an internal thread. A load-bearing threaded sleeve is threadedly connected to the through groove. A plurality of sealing ring sleeves are arranged below the load-bearing threaded sleeve. The sealing ring sleeves are stacked along the inner axis of the limiting sleeve. An inverted truncated cone-shaped buffer pad is connected to the load-bearing threaded sleeve. One end of the mover passes through the load-bearing threaded sleeve and the central cavity of the limiting sleeve.

[0020] An electromagnetic reverse thrust device is arranged at the bottom of the limiting sleeve on one side, and the electromagnetic reverse thrust device is used to buffer the impact on the inner side of the mover. The electromagnetic reverse thrust device includes an anti-collision housing, and the anti-collision housing extends from one side of the limiting sleeve. The anti-collision housing is an annular sleeve structure, and an electromagnetic coil is carried in the anti-collision housing. A through cavity is opened in the center of the anti-collision housing to match the diameter of the mover. The multi-stage stator is wrapped with an inner protective shell, and the inner protective shell is in contact with the outside of the anti-collision ring sleeve. An anti-collision ring sleeve is arranged at the bottom of the anti-collision housing.

[0021] The gas production cleaning structure includes a rotating seat, which is movably installed in the annular cavity of the liquid-gas inlet pipe and the liquid-gas separation screen pipe. The rotating seat is an annular structure sleeved on the bottom end of the liquid-gas separation screen pipe, and a plurality of cleaning rods are evenly arranged on the rotating seat. The top ends of the plurality of cleaning rods extend to the top of the oil-gas separation screen pipe, and the top ends of the plurality of cleaning rods are connected through a rotating ring. The rotating ring is provided with a plurality of rotating magnetic blocks. The bottom end of the submersible linear motor is electrically connected to a rotating coil, and the magnetic field generated by the rotating coil can drive the plurality of rotating magnetic blocks to rotate;

[0022] An integrated control casing is provided on the packer at positions corresponding to a plurality of rotating magnetic blocks. The rotating coil is assembled in the integrated control casing. The rotating coil is a three-phase AC coil. The control wire on the integrated control casing is extended from a submersible linear motor and connected to the rotating coil.

[0023] A water drainage and gas production process for a submersible linear motor, applied to the above-mentioned water drainage and gas production equipment for a submersible linear motor, comprises the following steps: step S1, equipment connection, step S2, pipe sleeve seat sealing, step S3, water drainage and gas production, step S4, liquid-gas separation, step S5, equipment cleaning;

[0024] Step S1, equipment connection: connect the liquid-gas separation device, the submersible linear motor, the air anchor screen pipe, the plunger pump and the anti-buried sand settling pipe in sequence, install a packer between the liquid-gas inlet and the exhaust screen hole in the middle section of the liquid-gas separation device, and connect the control wire of the submersible linear motor to the integrated control housing;

[0025] Step S2, pipe casing sealing: the assembled equipment is lowered into the gas production casing of the gas well with the liquid-gas separation device as the bottom, the packer is opened at the gas production position to achieve sealing, the liquid-gas separation device is fixed to the corresponding gas production formation, and the anti-buried sand settling pipe is connected to the drainage end of the large four-way on the well through the oil pipe, and the exhaust end of the large four-way on the well is connected to the gas outlet pipe;

[0026] Step S3, water drainage and gas production: power the submersible linear motor through the cable to control the submersible linear motor to work, and as the mover of the submersible linear motor reciprocates, the plunger pump and the liquid-gas separation device are driven to work to achieve water drainage and gas production, which is specifically divided into the following steps;

[0027] Step S3.1, the mover of the submersible linear motor moves upward: the mover of the submersible linear motor drives the piston rod of the plunger pump to move upward, and the fixed valve group at the bottom of the plunger pump is closed. At this time, the one-way valve group on the liquid-gas separation device is opened, so that the oil and gas in the formation enter the liquid-gas separation device under the action of negative pressure. After the liquid-gas separation device separates the liquid and gas, the liquid passes through the one-way valve group in one direction under the action of the pump suction pipe, and then enters the inner cavity of the mover of the submersible linear motor;

[0028] Step S3.2, the submersible linear motor mover moves downward: when the submersible linear motor mover drives the piston rod to move downward, the fixed valve group at the upper end of the plunger pump is closed, and the fixed valve group at the lower end is opened, and the downward movement of the piston rod also puts the inner cavity of the plunger pump in a negative pressure state, and then enters the pump cavity of the plunger pump due to the negative pressure;

[0029] Step S3.3, the mover of the submersible linear motor goes up again: when the mover of the submersible linear motor goes up again, the fixed valve group at the bottom of the plunger pump is closed, and the piston at the head end of the piston rod pushes the liquid upward, and the well fluid goes up through the fixed valve group at the upper end of the plunger pump, and the well fluid is discharged from the drainage end of the large cross-way on the well through the oil pipe, and the well fluid and gas are pumped to the ground through the reciprocating motion of the submersible linear motor;

[0030] Step S3.4, protecting the mover and the connection housing of the submersible linear motor: during the reciprocating motion of the mover of the submersible linear motor, a pair of buffer structures are used to buffer the motion of the mover neodymium magnet of the submersible linear motor, thereby protecting the mover and the connection housing;

[0031] Step S4, liquid-gas separation: during the upward movement of the mover of the submersible linear motor, the well fluid and the gas enter the liquid-gas separation device together, and after the liquid-gas separation sieve hole in the liquid-gas separation device is separated once, during the downward movement of the mover of the submersible linear motor, the liquid and gas entering the mover of the submersible linear motor are subjected to secondary liquid-gas separation through the gas anchor sieve pipe, so that most of the target gas enters the annulus between the gas production casing and the equipment, and the gas is discharged through the exhaust end of the large four-way on the well;

[0032] Step S5, equipment cleaning: During the gas production process, the electric power is released downward by the submersible linear motor, and the gas production cleaning structure is driven by the rotating coil, so that the rotating ring drives the cleaning rod to rotate, and the cleaning bristles of the cleaning rod are used to clean the liquid-gas inlet hole and the liquid-gas separation sieve hole.

[0033] Beneficial effects: A submersible linear motor is used as the power to control a special plunger pump to extract well fluid and oil and gas. A liquid-gas separation device is provided at the bottom of the submersible linear motor as the liquid inlet end, allowing liquid and gas to enter and undergo a primary separation. After a secondary separation through the air anchor screen on the submersible linear motor, liquid and gas diversion is achieved, and the well fluid and oil and gas are discharged separately. The equipment has a simple structure and can adapt to a variety of harsh gas production environments.

[0034] The submersible linear motor is used as the power to control the special plunger pump to extract the well fluid and oil and gas. A liquid-gas separation device is set at the bottom of the submersible linear motor as the liquid inlet end, so that the liquid and gas enter and are separated once, and then the gas anchor screen on the submersible linear motor is used for secondary separation to achieve liquid-gas diversion, and the well fluid and oil and gas are discharged separately. The equipment has a simple structure and can adapt to a variety of harsh gas production environments. It has the following specific advantages:

[0035] 1. Based on the geological characteristics of the gas reservoir, the production status of the water-producing wells and other factors, the project targets sand-producing wells, high-angle wells, and wells with a drainage volume of ≥30m 3 For wells with large / d fluctuations, the hollow mover of the submersible linear motor is used as a passage for liquid and gas collection, which effectively avoids problems such as blockage and can increase the service life of the equipment;

[0036] 2. The gas production device is equipped with a two-stage downhole diversion structure, the first stage is a liquid-gas separation device, and the second stage is a gas anchor screen. After the liquid and gas enter the two, the gas-liquid diversion is completed under the action of pressure and gravity. The use of the large four-way on the well can improve the efficiency of gas production and reduce the workload of liquid-gas separation on the well;

[0037] 3. A gas production cleaning structure is set at the liquid-gas separation device, and the operation of the gas production cleaning structure is controlled by the same power supply of the submersible linear motor to clean the gas production liquid inlet position and the liquid-gas separation position to avoid gravel blockage, improve gas production efficiency, reduce equipment maintenance work, and extend equipment maintenance cycle;

[0038] 4. According to the working characteristics of the submersible linear motor, a buffer structure is set at both ends of the submersible linear motor. The buffer structure is used to buffer the reciprocating motion of the mover of the submersible linear motor to avoid the mover of the submersible linear motor from causing a large impact on the casing of the submersible linear motor, affecting the sealing and causing damage to the submersible linear motor, thereby effectively improving the service life of the submersible linear motor and extending the maintenance cycle.

[0039] Beneficial Effects

[0040] The present invention provides a water drainage and gas production process of a submersible linear motor. It has the following beneficial effects: a submersible linear motor is used as a power to control a special plunger pump to extract well fluid and oil and gas, a liquid-gas separation device is provided at the bottom of the submersible linear motor as a liquid inlet end, so that liquid and gas enter and are separated once, and then the gas anchor screen on the submersible linear motor is used for secondary separation to achieve liquid-gas diversion, and the well fluid and oil and gas are discharged separately. The equipment has a simple structure and can adapt to a variety of harsh gas production environments. It has the following specific advantages:

[0041] 1. Based on the geological characteristics of the gas reservoir, the production status of the water-producing wells and other factors, the project targets sand-producing wells, high-angle wells, and wells with a drainage volume of ≥30m 3 For wells with large / d fluctuations, the hollow mover of the submersible linear motor is used as a passage for liquid and gas collection, which effectively avoids problems such as blockage and can increase the service life of the equipment;

[0042] 2. The gas production device is equipped with a two-stage downhole diversion structure, the first stage is a liquid-gas separation device, and the second stage is a gas anchor screen. After the liquid and gas enter the two, the gas-liquid diversion is completed under the action of pressure and gravity. The use of the large four-way on the well can improve the efficiency of gas production and reduce the workload of liquid-gas separation on the well;

[0043] 3. A gas production cleaning structure is set at the liquid-gas separation device, and the operation of the gas production cleaning structure is controlled by the same power supply of the submersible linear motor to clean the gas production liquid inlet position and the liquid-gas separation position to avoid gravel blockage, improve gas production efficiency, reduce equipment maintenance work, and extend equipment maintenance cycle;

[0044] 4. According to the working characteristics of the submersible linear motor, a buffer structure is set at both ends of the submersible linear motor. The buffer structure is used to buffer the reciprocating motion of the mover of the submersible linear motor to avoid the mover of the submersible linear motor from causing a large impact on the casing of the submersible linear motor, affecting the sealing and causing damage to the submersible linear motor, thereby effectively improving the service life of the submersible linear motor and extending the maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a three-dimensional structural schematic diagram of a water discharge and gas production process of a submersible linear motor according to the present invention.

[0046] Figure 2 The figure is a schematic diagram of the internal structure of a water discharge and gas production process of a submersible linear motor according to the present invention.

[0047] Figure 3 It is a schematic cross-sectional structure diagram of a water discharge and gas production process of a submersible linear motor according to the present invention.

[0048] Figure 4 It is a schematic diagram of the three-dimensional structure of a submersible linear motor in a water discharge and gas production process of a submersible linear motor according to the present invention.

[0049] Figure 5 This is a schematic diagram of the internal structure of a submersible linear motor in a water discharge and gas production process of a submersible linear motor described in the present invention.

[0050] Figure 6 This is a schematic structural diagram of a liquid-gas separation device for a water discharge and gas production process of a submersible linear motor according to the present invention.

[0051] Figure 7 This is a schematic structural diagram of a liquid-gas separation device for a water discharge and gas production process of a submersible linear motor according to the present invention.

[0052] Figure 8 This is a schematic diagram of the anti-buried sand settling tube structure of the water drainage and gas production process of the submersible linear motor described in the present invention.

[0053] Fig. 9 This is a schematic diagram of the anti-buried sand settling tube structure of the water drainage and gas production process of the submersible linear motor described in the present invention.

[0054] Fig.10 It is a schematic diagram of the buffer structure of the water discharge and gas production process of the submersible linear motor described in the present invention.

[0055] Fig.11 It is a three-dimensional structural schematic diagram of the gas production cleaning structure of the water discharge gas production process of the submersible linear motor described in the present invention.

[0056] Fig.12It is a schematic cross-sectional view of the gas production cleaning structure of the water discharge gas production process of the submersible linear motor described in the present invention.

[0057] In the figure: 1, submersible linear motor; 2, plunger pump; 3, anti-buried sand settling pipe; 4, liquid-gas separation device; 5, gas anchor screen; 6, packer; 11, connecting casing; 12, mover; 13, multi-stage stator; 14, buffer structure; 15, inner casing; 21, pump casing; 22, piston rod; 23, fixed valve group; 31, pipe sleeve; 32, second upper joint; 33, second lower joint; 34, inner separation pipe; 35, inner joint; 36, outer anti-sinking pipe; 41, gas production cleaning structure; 42, liquid-gas inlet pipe; 43, exhaust screen; 44, first lower joint; 45, first An upper joint; 46, a one-way valve group; 47, a liquid-gas separation screen tube; 48, a pump suction pipe; 51, an air anchor inner core; 52, an air anchor outer shell; 141, a limiting sleeve; 142, a through groove; 143, a load-bearing threaded sleeve; 144, a sealing ring sleeve; 145, a buffer pad; 146, an electromagnetic reverse thrust device; 1461, an anti-collision casing; 1462, an electromagnetic coil; 1463, an anti-collision ring sleeve; 411, a rotating seat; 412, a cleaning rod; 413, a rotating ring; 414, a rotating magnetic block; 415, a rotating coil; 416, an integrated control casing; 417, control wires. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] See also Figure 1-10 The present invention provides an implementation scheme: in the exploitation of modern drainage gas fields, commonly used gas production methods include gas lift production, foam production and tubing production, etc. The above-mentioned gas production methods have certain requirements on the environment of the gas field to a certain extent, or pollution to the formation, or high formation pressure, or sand content, or large liquid volume. Therefore, the gas production environment is limited. For downhole operations with high sand content and complex gas production environment, the effect is poor. The gas production combination composed of a submersible motor and a special plunger pump 2 does not have the above-mentioned many restrictions when performing downhole gas production. The submersible motor and the characteristic plunger pump 2 can guide the mixed fluid through the central cavity of the mover 12, so the requirement for the sand content of the well fluid is relatively low, which greatly improves the convenience of gas production in gas wells with large liquid volume and high sand content, increases the service life of the equipment, and reduces the maintenance work of the equipment.

[0060] Therefore, the present application discloses a submersible linear motor 1 drainage and gas production equipment, which uses a submersible linear motor 1 and a special plunger pump 2 in the well to achieve drainage and gas production. Figure 1 -Attached Figure 3 It can be seen that the specific components of the gas production equipment are composed of an anti-buried sand settling pipe 3, a plunger pump 2, a gas anchor screen pipe 5, a submersible linear motor 1 and a liquid-gas separation device 4 from top to bottom. The above parts are axially combined and connected and then lowered into the production position in the gas production casing, so that the liquid-gas separation device 4 corresponds to the gas production formation;

[0061] Specifically, the piston rod 22 of the plunger pump 2 is connected to one end of the mover 12 of the submersible linear motor 1, the liquid outlet end of the plunger pump 2 is connected to the anti-buried sand settling pipe 3, and the bottom end of the submersible linear motor 1 is connected to the liquid-gas separation device 4. The mover 12 of the submersible linear motor 1 is actuated to drive the piston rod 22 of the plunger pump 2 to move, thereby changing the air pressure inside the plunger pump 2, and cooperating with the fixed valve group 23 on both sides of the plunger pump 2, so that the air pressure in the cavity of the mover 12 of the submersible linear motor 1 connected thereto and the liquid-gas separation device 4 is changed accordingly, so that the well fluid and gas enter the liquid-gas separation device 4 for separation, and then the gas rises to the ground through the annulus between the gas production casing and the device, and the well fluid enters the plunger pump 2 under the action of air pressure until it is discharged from the ground through the anti-buried sand settling pipe 3, and a large four-way valve is installed at the end of the ground gas production casing to divert the well fluid and gas.

[0062] In order to improve the efficiency of gas production, so that the liquid and gas can complete most of the diversion work underground, the present application sets a liquid-gas separation device 4 at the formation position of gas production. Specifically, the bottom of the above-mentioned liquid-gas separation device 4 is connected with a packer 6. The packer 6 is located at the bottom of the gas production equipment and is used to be sealed in the gas production casing, so that the liquid-gas separation device 4 corresponds to the external formation pressure that squeezes the well fluid and oil and gas into the liquid-gas separation device 4 when the submersible linear motor 1 drives the special plunger pump 2 to operate. In the resetting process of the submersible linear motor 1, the well fluid and gas entering the liquid-gas separation device 4 enter the cavity of the mover 12 of the submersible linear motor 1 under the closure of the one-way valve;

[0063] In order to further separate the liquid and gas, an air anchor screen 5 is connected between the plunger pump 2 and the submersible linear motor 1. The air anchor screen 5 is composed of an air anchor shell 52 and a movable air anchor inner core 51. The air anchor inner core 51 is connected and communicated with the piston rod 22 of the plunger pump 2 and one end of the mover 12 of the submersible linear motor 1. On the one hand, it is used to transmit power. On the other hand, when the liquid-gas mixed fluid flows through the air anchor screen 5, air anchor holes are provided on the air anchor inner core 51 and the air anchor shell 52. Under the separation effect of the air anchor, the gas is further separated and enters between the gas production casings. Since the liquid cannot pass through the air anchor, the well fluid is gradually lifted to the ground during the reciprocating motion of the submersible linear motor 1.

[0064] The plunger pump 2 is a special plunger structure and its piston rod 22 is connected to the submersible linear motor 1. The plunger pump 2 uses axial transportation of well fluid. A pair of fixed valve groups 23 are provided at both ends of the plunger pump 2. Both ends of the pump housing 21 of the plunger pump 2 are respectively connected to the air anchor screen 5 and the anti-buried sand settling pipe 3;

[0065] In order to prevent the sand entering the gas production casing from clogging the fixed valve group 23 of the plunger pump 2 during the well shutdown process, the liquid outlet of the plunger pump 2 is connected to the anti-buried sand settling pipe 3 through a joint. The anti-buried sand settling pipe 3 is used to prevent the sand production well from clogging the fixed valve group 23 due to the sedimentation of sand after the well is stopped and unable to work normally;

[0066] Furthermore, the specific composition of the submersible linear motor 1 is as follows: the submersible linear motor 1 is composed of a connecting housing 11, a mover 12 installed in the connecting housing 11, and a multi-stage stator 13 fixed on the connecting housing 11;

[0067] According to the instruction manual Figure 4 -Attached Figure 5 It can be seen that the connection housing 11 of the above-mentioned submersible linear motor 1 is a housing of a cylindrical structure, the multi-stage stator 13 in the connection housing 11 is arranged in a unidirectional array along the axial direction of the connection housing 11, the mover 12 is a pipe with a central cavity structure, the mover 12 in the connection housing 11 is connected to the piston rod 22 of the plunger pump 2, and the two ends of the connection housing 11 are respectively connected to the liquid-gas separation device 4 and the air anchor screen 5, and the mover 12 is connected to the piston rod 22 of the plunger pump 2 through the movable connection part of the air anchor screen 5, and the multi-stage stator 1 3 adopts multi-stage permanent magnets and stator coils to be arranged alternately to produce an alternating magnetic field. A neodymium magnet is arranged on the mover 12 to sense the alternating magnetic field. The mover 12 is made to reciprocate by controlling the direction of the alternating magnetic field, thereby driving the piston rod 22 to move, and cooperates with various valve groups to pump out the well fluid and oil and gas. In order to buffer the strong kinetic energy of the mover 12 during the reciprocating motion, a pair of buffer structures 14 are arranged at both ends of the connecting housing 11 to buffer and seal the submersible linear motor 1 connecting the housing 11;

[0068] Furthermore, a gas production cleaning structure 41 is provided at the bottom end of the liquid-gas separation device 4. The gas production cleaning structure 41 is correspondingly arranged in the outer annulus of the liquid-gas separation device 4. Through the power transfer of the submersible linear motor 1, the gas production cleaning structure 41 and the submersible linear motor 1 are linked to clean the interlayer to prevent gravel from clogging the hole and causing the liquid-gas separation position to be blocked.

[0069] According to the instruction manual Figure 6 -Attached Figure 7It can be seen that the liquid-gas separation device 4 is externally composed of a liquid-gas inlet pipe 42 and an exhaust screen pipe 43, and the packer 6 is sleeved at the connection between the liquid-gas inlet pipe 42 and the exhaust screen pipe 43. The liquid-gas inlet pipe 42 is connected with a first lower joint 44, and the exhaust screen pipe 43 is connected with a first upper joint 45, which is connected to the submersible linear motor 1 through the first upper joint 45, and is connected to the plugging seat through the first lower joint 44 to plug the liquid-gas inlet pipe 42, and the plugging seat is sealed at the oil production position of the gas production casing;

[0070] Specifically, the liquid-gas separation device 4 is provided with a liquid-gas separation screen tube 47 and a pump suction pipe 48 in the liquid-gas inlet pipe 42 and the exhaust screen tube 43. The liquid-gas inlet pipe 42 is axially connected to the exhaust screen tube 43. The bottom end of the liquid-gas inlet pipe 42 is provided with a plurality of liquid-gas inlets in a circular array. Under the action of formation pressure, oil and gas are mixed and enter the liquid-gas inlet pipe 42. A liquid-gas separation screen tube 47 is coaxially arranged in the liquid-gas inlet pipe 42. The top end of the liquid-gas separation screen tube 47 is a bucket-shaped structure combined with the inner wall of the liquid-gas inlet pipe 42. The bottom end of the liquid-gas separation screen tube 47 is connected to the bottom of the first lower joint 44, so that an annulus is formed between the liquid-gas separation screen tube 47 and the liquid-gas inlet pipe 42.

[0071] In the specific implementation process, the oil and gas enter the liquid-gas separation screen tube 47 from the liquid-gas separation screen hole set near the top of the liquid-gas separation screen tube 47. After the oil and gas enter, as the liquid level and gas rise, under the separation effect of gravity, the oil flows downward to the bottom position of the liquid-gas separation screen tube 47. Since the one-way valve group 46 is arranged on the first upper joint 45 and is connected to the mover 12 of the submersible linear motor 1, under the action of the mover 12, the one-way valve group 46 is intermittently switched, and the pump suction pipe 48 is connected to the one-way valve group 46 to extend It extends to the bottom of the liquid-gas separation screen pipe 47 and has a spacing distance of 1-3 cm from the first lower joint 44. Therefore, when the liquid level reaches the bottom end of the pump suction pipe 48, the well fluid enters the cavity of the mover 12 from the pump suction pipe 48 through the one-way valve group 46 through the suction action of the pump suction pipe 48, and the gas passes through because it is lighter, and then passes through the annulus between the pump suction pipe 48 and the liquid-gas inlet pipe 42 and the discharge screen pipe, and is discharged upward from the sieve holes of the discharge screen pipe into the external gas production casing, and then discharged upward out of the well.

[0072] According to the instruction manual Figure 8-9 It can be seen that the anti-sand sinking pipe 3 includes a pipe sleeve 31, the upper and lower ends of the pipe sleeve 31 are connected with a second upper joint 32 and a second lower joint 33, the inner cavity channel of the second lower joint 33 is connected with an inner separation pipe 34, the end of the inner separation pipe 34 is connected with an inner joint 35, the inner joint 35 is connected with an outer anti-sinking pipe 36, the outer anti-sinking pipe 36 is coaxially arranged with the inner separation pipe 34, the outer anti-sinking pipe 36 extends to the upper part of the second lower joint 33, and a spacing distance of 1-3 cm is set between the outer anti-sinking pipe 36 and the second lower joint 33;

[0073] In the specific implementation process, the oil and gas pipe sleeve 31 is connected through the second upper joint 32, and is connected to the pump housing 21 of the plunger pump 2 through the second lower joint 33. The well fluid enters the inner separation pipe 34 of the anti-buried sand settling pipe 3, and enters the annulus between the inner separation pipe 34 and the outer anti-sinking pipe 36 through the drainage hole at the upper end of the inner separation pipe 34. The upper end of the inner separation pipe 34 is connected to the outer anti-sinking pipe 36 through the inner joint 35. The well fluid entering the annulus changes direction downward and enters the outer anti-sinking pipe 36 from the bottom of the outer anti-sinking pipe. The annulus between the sunken tube 36 and the pipe sleeve 31 is thereby entered into the gas production casing and lifted to the ground. The sand particles that have entered the gas production casing sink downward to the annulus between the outer anti-sinking tube 36 and the pipe sleeve 31 after the well is stopped. There are no sand particles in the annulus between the outer anti-sinking tube 36 and the inner separation tube 34 and in the inner separation tube 34. Therefore, the fixed valve group 23 of the special plunger pump 2 avoids the troubleshooting operation of sand burial after the sand-producing well is stopped, thereby improving the efficiency of drainage and gas production, and at the same time better producing gas from gas wells with a large sand content.

[0074] According to the instruction manual Figure 4 -Attached Figure 5 And attached Fig.10 It can be known that the buffer structure 14 includes a limiting sleeve 141, which is assembled at the end of the connecting housing 11. The top of the limiting sleeve 141 is provided with a sleeve groove of an inverted cone structure, and the bottom of the sleeve groove is integrally connected with a through groove 142 of a columnar structure extending into the inner cavity of the connecting housing 11. The through groove 142 is provided with an internal thread, and a load-bearing thread sleeve 143 is threadedly connected to the through groove 142. A plurality of sealing ring sleeves 144 are arranged below the load-bearing thread sleeve 143, and the plurality of sealing ring sleeves 144 are stacked along the inner axis of the limiting sleeve 141. The load-bearing thread sleeve 143 is connected with an inverted truncated cone-shaped buffer pad 145, and one end of the mover 12 passes through the load-bearing thread sleeve 143 and the central cavity of the limiting sleeve 141;

[0075] In the specific implementation process, the limiting sleeve 141 is sealed and connected to the end of the connecting casing 11, and a sleeve groove of an inverted cone structure is set on the limiting sleeve 141. The buffer pad 145 is positioned and installed through the sleeve groove. The buffer pad 145 is connected to the through groove 142 through the load-bearing threaded sleeve 143 to form a stable installation. When the buffer pad 145 contacts the air anchor inner core 51 and the neodymium magnet of the mover 12, it is limited by the buffer pad 145, and the sleeve groove and the buffer pad 145 are a matching inverted cone structure. When the buffer pad 145 is subjected to force, it is composed of two parallel conical components, which is suitable for the vibration environment of the downhole submersible linear motor 1 with a large static deflection and high load. By utilizing the shear and compression advantages of the shock-absorbing pad of the special rubber material, a vibration reduction effect is provided. The mover 12 passes through the load-bearing threaded sleeve 143 and the buffer pad 145, and is further sealed by wrapping the outer wall of the mover 12 with the sealing ring sleeve 144 and the buffer pad 145 to improve the sealing performance of the equipment.

[0076] It should be noted that the buffer structures 14 located on both sides of the connecting casing 11 are different. The buffer structure 14 located on the side where the connecting casing 11 is connected to the liquid-gas separation device 4 does not have an electromagnetic reverse thrust device 146, while the buffer structure 14 located on the side connected to the gas anchor screen pipe 5 has an electromagnetic reverse thrust device 146. In the buffer structure 14 on the side without the electromagnetic reverse thrust device 146, the buffer pad 145 faces the inner cavity of the connecting casing 11, which is used to limit the neodymium magnet on the mover 12 and achieve a buffering effect.

[0077] According to the instruction manual Fig.10 It can be seen that an electromagnetic reverse thrust device 146 is provided at the bottom of the limiting sleeve 141 connected to one side of the air anchor screen pipe 5. The electromagnetic reverse thrust device 146 is used to buffer the impact of the inner side of the mover 12 on the connection housing 11 and the position of the limiting sleeve 141. Specifically, the electromagnetic reverse thrust device 146 includes an anti-collision housing 1461. The anti-collision housing 1461 extends from one side of the limiting sleeve 141. The anti-collision housing 1461 is an annular sleeve structure. The anti-collision housing 1461 is equipped with an electromagnetic coil 1462. A through cavity is opened in the center to match the diameter of the mover 12. In the specific implementation process, the anti-collision housing 1461 extends from one side of the limit sleeve 141. The inner ring of the anti-collision housing 1461 is provided with an electromagnetic coil 1462. A position switch is set on the mover 12. When the mover 12 moves close to the anti-collision housing 1461, the electromagnetic coil 1462 is controlled to work to generate an electromagnetic field. The electromagnetic field acts on the neodymium magnet of the mover 12 to generate a reverse thrust, thereby reducing the impact force before the mover 12 contacts the buffer pad 145.

[0078] In order to further protect the windings on the stator, an inner protective shell 15 is wrapped around the multi-stage stator 13, and an anti-collision ring sleeve 1463 is arranged at the bottom of the anti-collision housing 1461. The inner protective shell 15 is in contact with the outside of the anti-collision ring sleeve 1463. The permanent magnet and the coil of the stator are fully wrapped by the inner protective shell 15. The contact between the inner protective shell 15 and the anti-collision ring sleeve 1463 plays a sealing role.

[0079] According to the instruction manual Figure 6 -Attached Figure 7 And attached Fig.11 -Attached Fig.12It can be known that the above-mentioned gas production cleaning structure 41 includes a rotating seat 411, which is movably installed in the annular cavity of the liquid-gas inlet pipe 42 and the liquid-gas separation screen tube 47. The rotating seat 411 is an annular structure sleeved on the bottom end of the liquid-gas separation screen tube 47, and a plurality of cleaning rods 412 are evenly arranged on the rotating seat 411. The top ends of the plurality of cleaning rods 412 extend to the top of the oil-gas separation screen tube. The top ends of the plurality of cleaning rods 412 are connected through a rotating ring 413, and a plurality of rotating magnetic blocks 414 are arranged on the rotating ring 413. The bottom end of the submersible linear motor 1 is electrically connected to a rotating coil 415, and the magnetic field generated by the rotating coil 415 can drive the plurality of rotating magnetic blocks 414 to rotate;

[0080] In the specific implementation process, the rotating seat 411 is divided into two parts. The bottom of the rotating seat 411 is an annular block, and a partially annular slide groove is opened on the annular block. The upper part of the rotating seat 411 is a circular ring assembled in the slide groove. An integrated control housing 416 is arranged at the position corresponding to a plurality of rotating magnetic blocks 414 on the packer 6. The rotating coil 415 is assembled in the integrated control housing 416. The control wire 417 on the integrated control housing 416 is extended from the submersible linear motor 1 and connected to the rotating coil 415. While supplying power to the submersible motor, the power is transferred to the rotating coil 4 through the control wire 417. 15, the rotating coil 415 is a three-phase AC coil, and the three-phase AC power is passed through the rotating coil 415 to form a rotating magnetic field. The rotating magnetic field acts on the rotating magnet 414 on the rotating ring 413. The rotating magnet 414 is subjected to the electromagnetic force, and the rotating ring 413 rotates, thereby driving the plurality of cleaning rods 412 to rotate, so that the cleaning bristles on the cleaning rods 412 clean the liquid-gas separation sieve holes of the liquid-gas separation sieve tube 47 and the liquid-gas inlet of the liquid-gas inlet pipe 42, ensuring that the two are normal, so that the drainage and gas production process can proceed normally, the gas production efficiency can be improved, the maintenance workload can be reduced, and the maintenance cycle can be extended.

[0081] Embodiment 1: The working principle of the water drainage and gas production equipment of the above-mentioned submersible linear motor 1 is as follows: the gas production equipment uses the submersible linear motor 1 and the special plunger pump 2 to produce oil, and the specific composition includes a liquid-gas separation device 4, a submersible linear motor 1, a gas anchor screen pipe 5, a plunger pump 2 and an anti-buried sand settling pipe from bottom to top;

[0082] The equipment is lowered along the gas production casing, and the equipment is sealed by the packer 6, so that the liquid-gas separation device 4 is facing the gas production formation. The power core of the equipment is the submersible linear motor 1. The mover 12 of the submersible linear motor 1 reciprocates, thereby driving the piston rod 22 of the plunger pump 2 to reciprocate. With the submersible linear motor 1 as the dividing line, when the mover 12 of the submersible linear motor 1 goes up, the fixed valve group 23 at the bottom end of the plunger pump 2 is closed. At this time, the one-way valve group 46 located on the liquid-gas separation device 4 is opened, so that the oil and gas in the formation enter the liquid-gas separation device 4 under the action of negative pressure. After the liquid-gas separation device 4 separates the liquid and gas, the liquid passes through the one-way valve group 46 in one direction under the action of the pump suction pipe 48, and then enters the inner cavity of the mover 12 of the submersible linear motor 1;

[0083] When the mover 12 of the submersible linear motor 1 drives the piston rod 22 to move downward, the fixed valve group 23 at the upper end of the plunger pump 2 is closed, while the fixed valve group 23 at the lower end is opened. The downward movement of the piston rod 2 also puts the inner cavity of the plunger pump 2 in a negative pressure state, and then the negative pressure enters the pump cavity of the plunger pump 2. When the mover 12 of the submersible linear motor 1 moves upward again, the liquid is pushed through the fixed valve group 23 at the upper end of the plunger pump 2 by the piston, and enters the anti-buried sand settling pipe 3, and reciprocates for many times to discharge the well fluid;

[0084] Then, the liquid-gas separation device 4 arranged at the lower end of the submersible linear motor 1 performs a primary separation on the liquid and the gas, and the liquid and the gas are separated for a secondary time by arranging a gas anchor screen at the upper end of the submersible linear motor 1. The gases separated twice enter the annulus between the gas production casing and the equipment, and the oil and gas are respectively diverted through the large four-way arranged at the wellhead of the gas well, and the well fluid is discharged and collected from another bypass of the large four-way. In this way, the liquid and the gas can be separated underground, the efficiency of gas production is improved, and the cost of gas-liquid separation is reduced;

[0085] Since the amount of sediment at the gas production layer is relatively large, the use of the submersible linear motor 1 to drain water and produce gas can reduce the requirements for the sediment content of the gas field to a certain extent. However, the holes at the position of the liquid-gas separation device 4 are also prone to blockage. Therefore, a gas production cleaning structure 41 is set on the liquid-gas separation device 4. By powering down the submersible linear motor 1, the operation of the gas production cleaning structure 41 is controlled to clean the holes of the liquid-gas separation device 4, maintain the smooth flow of liquid-gas intake and separation, improve the service life of the equipment, extend the maintenance cycle, and reduce maintenance work;

[0086] At the same time, a pair of buffer structures 14 are respectively arranged at both ends of the connecting casing 11 of the submersible linear motor 1. The buffer structure 14 can be used to buffer the mover 12 of the submersible linear motor 1 to prevent the reciprocating motion of the mover 12 of the submersible linear motor 1 from causing impact damage to the casing and the neodymium magnet group of the mover 12, thereby extending the service life of the submersible linear motor 1 and reducing maintenance work.

[0087] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A submersible linear motor drainage and gas production equipment, comprising a submersible linear motor (1), one side of the submersible linear motor (1) is connected to a plunger pump (2), a piston rod (22) of the plunger pump (2) is connected to one end of a mover (12) of the submersible linear motor (1), It is characterized in that The liquid outlet end of the plunger pump (2) is connected to an anti-buried sand settling pipe (3), and the bottom end of the submersible linear motor (1) is connected to a liquid-gas separation device (4); The piston rod (22) of the plunger pump (2) is connected to the submersible linear motor (1); the plunger pump (2) uses axial transportation of well fluid; a pair of fixed valve groups (23) are provided at both ends of the plunger pump (2); The anti-buried sand settling pipe (3) is connected to the liquid outlet end of the plunger pump (2), and the anti-buried sand settling pipe (3) is used to prevent the sand-producing well from being blocked by the fixed valve group (23) due to the sedimentation of sand particles after the well is stopped, so that the fixed valve group (23) cannot work normally; The submersible linear motor (1) is composed of a connecting housing (11), a mover (12) installed in the connecting housing (11), and a multi-stage stator (13) fixed on the connecting housing (11); the mover (12) in the connecting housing (11) is connected to a piston rod (22) of a plunger pump (2); and a pair of buffer structures (14) are provided at both ends of the connecting housing (11); The liquid-gas separation device (4) corresponds to the gas production formation, and the well fluid and gas are separated once through the partition in the liquid-gas separation device (4), and a gas production cleaning structure (41) is arranged at the bottom end of the liquid-gas separation device (4), and the gas production cleaning structure (41) is linked with the submersible linear motor (1) to clean the partition; The bottom of the liquid-gas separation device (4) is connected to a packer (6), which is located at the bottom end of the gas production equipment and is used to be sealed in the gas production casing, thereby fixing the position of the liquid-gas separation device (4); An air anchor screen pipe (5) is connected between the plunger pump (2) and the submersible linear motor (1), and the air anchor screen pipe (5) is used for secondary separation of oil and gas; The liquid-gas separation device (4) is externally composed of a liquid-gas inlet pipe (42) and an exhaust screen pipe (43); the liquid-gas inlet pipe (42) is axially connected to the exhaust screen pipe (43); the liquid-gas inlet pipe (42) is connected to a first lower joint (44); the exhaust screen pipe (43) is connected to a first upper joint (45); a one-way valve group (46) is provided on the first upper joint (45) and is connected to the mover (12) of the submersible linear motor (1); a liquid-gas separation screen pipe (47) is coaxially arranged in the liquid-gas inlet pipe (42); the top end of the liquid-gas separation screen pipe (47) is a bucket-shaped structure combined with the inner wall of the liquid-gas inlet pipe (42); the one-way valve group (46) is connected to a pump suction pipe (48) extending to the bottom of the liquid-gas separation screen pipe (47) and having a spacing of 1-3 cm from the first lower joint (44); The bottom end of the liquid-gas inlet pipe (42) is provided with a plurality of liquid-gas inlets in a circular array, and the top end of the liquid-gas separation screen pipe (47) is provided with a plurality of liquid-gas separation screen holes in a circular array; The packer (6) is sleeved at the connection between the liquid and gas inlet pipe (42) and the exhaust screen pipe (43). The liquid and gas inlet pipe (42) and the exhaust screen pipe (43) are integrated pipes, and exhaust screen holes and liquid and gas inlets are respectively provided at the upper and lower ends.

2. A submersible linear motor drainage and gas production equipment according to claim 1, It is characterized in that The connecting housing (11) of the submersible linear motor (1) is a housing with a columnar structure, the multi-stage stators (13) in the connecting housing (11) are arranged in a unidirectional array along the axial direction of the connecting housing (11), and the mover (12) is a pipe with a central cavity structure.

3. A submersible linear motor drainage and gas production equipment according to claim 2, It is characterized in that The anti-sand sinking pipe (3) comprises a pipe sleeve (31), the upper and lower ends of the pipe sleeve (31) are connected with a second upper joint (32) and a second lower joint (33), the inner cavity channel of the second lower joint (33) is connected with an inner separation pipe (34), the end of the inner separation pipe (34) is connected with an inner joint (35), the inner joint (35) is connected with an outer anti-sinking pipe (36), the outer anti-sinking pipe (36) and the inner separation pipe (34) are coaxially arranged, the outer anti-sinking pipe (36) extends to the upper side of the second lower joint (33), and a spacing distance of 1-3 cm is arranged between the outer anti-sinking pipe (36) and the second lower joint (33).

4. A submersible linear motor drainage and gas production equipment according to claim 3, It is characterized in that The buffer structure (14) comprises a limiting sleeve (141), the limiting sleeve (141) is assembled at the end of the connecting housing (11), the top of the limiting sleeve (141) is provided with a sleeve groove of an inverted cone structure, the bottom of the sleeve groove is integrally connected with a through groove (142) of a columnar structure and extends into the inner cavity of the connecting housing (11), the through groove (142) is provided with an internal thread, a load-bearing thread sleeve (143) is threadedly connected to the through groove (142), a plurality of sealing ring sleeves (144) are arranged below the load-bearing thread sleeve (143), the plurality of sealing ring sleeves (144) are stacked along the inner axis of the limiting sleeve (141), the load-bearing thread sleeve (143) is connected with a buffer pad (145) of an inverted truncated cone shape, and one end of the mover (12) passes through the load-bearing thread sleeve (143) and the central cavity of the limiting sleeve (141).

5. A submersible linear motor drainage and gas production equipment according to claim 4, It is characterized in that An electromagnetic reverse thrust device (146) is provided at the bottom of the limiting sleeve (141) on one side, and the electromagnetic reverse thrust device (146) is used to buffer the impact on the inner side of the mover (12).

6. A submersible linear motor drainage and gas production equipment according to claim 5, It is characterized in that The gas production cleaning structure (41) comprises a rotating seat (411), wherein the rotating seat (411) is movably installed in the annular cavity between the liquid-gas inlet pipe (42) and the liquid-gas separation screen tube (47), wherein the rotating seat (411) is an annular structure sleeved on the bottom end of the liquid-gas separation screen tube (47), wherein a plurality of cleaning rods (412) are evenly arranged on the rotating seat (411), wherein the top ends of the plurality of cleaning rods (412) extend to the top of the oil-gas separation screen tube, wherein the top ends of the plurality of cleaning rods (412) are connected via a rotating ring (413), wherein the rotating ring (413) is provided with a plurality of rotating magnetic blocks (414), and the bottom end of the submersible linear motor (1) is electrically connected to a rotating coil (415), wherein the magnetic field generated by the rotating coil (415) can drive the plurality of rotating magnetic blocks (414) to rotate.

7. A submersible linear motor drainage and gas production equipment according to claim 6, It is characterized in that Brushes are arranged on both sides of the cleaning rod (412) corresponding to the positions of the liquid-gas inlet and the liquid-gas separation sieve holes.

8. A submersible linear motor water drainage and gas production process, applied to a submersible linear motor water drainage and gas production equipment as claimed in any one of claims 1 to 7. It is characterized in that The method comprises the following steps: step S1, equipment connection, step S2, pipe sleeve seat sealing, step S3, drainage and gas collection, step S4, liquid-gas separation, and step S5, equipment cleaning; Step S1, equipment connection: connect the liquid-gas separation device, the submersible linear motor, the air anchor screen pipe, the plunger pump and the anti-buried sand settling pipe in sequence, install a packer between the liquid-gas inlet and the exhaust screen hole in the middle section of the liquid-gas separation device, and connect the control wire of the submersible linear motor to the integrated control housing; Step S2, pipe casing sealing: the assembled equipment is lowered into the gas production casing of the gas well with the liquid-gas separation device as the bottom, the packer is opened at the gas production position to achieve sealing, the liquid-gas separation device is fixed to the corresponding gas production formation, and the anti-buried sand settling pipe is connected to the drainage end of the large four-way on the well through the oil pipe, and the exhaust end of the large four-way on the well is connected to the gas outlet pipe; Step S3, water drainage and gas production: power the submersible linear motor through the cable to control the submersible linear motor to work, and as the mover of the submersible linear motor reciprocates, the plunger pump and the liquid-gas separation device are driven to work to achieve water drainage and gas production, which is specifically divided into the following steps; Step S3.1, the mover of the submersible linear motor moves upward: the mover of the submersible linear motor drives the piston rod of the plunger pump to move upward, and the fixed valve group at the bottom of the plunger pump is closed. At this time, the one-way valve group on the liquid-gas separation device is opened, so that the oil and gas in the formation enter the liquid-gas separation device under the action of negative pressure. After the liquid-gas separation device separates the liquid and gas, the liquid passes through the one-way valve group in one direction under the action of the pump suction pipe, and then enters the inner cavity of the mover of the submersible linear motor; Step S3.2, the submersible linear motor mover moves downward: when the submersible linear motor mover drives the piston rod to move downward, the fixed valve group at the upper end of the plunger pump is closed, and the fixed valve group at the lower end is opened, and the downward movement of the piston rod also puts the inner cavity of the plunger pump in a negative pressure state, and then enters the pump cavity of the plunger pump due to the negative pressure; Step S3.3, the mover of the submersible linear motor goes up again: when the mover of the submersible linear motor goes up again, the fixed valve group at the bottom of the plunger pump is closed, and the piston at the head end of the piston rod pushes the liquid upward, and the well fluid goes up through the fixed valve group at the upper end of the plunger pump, and the well fluid is discharged from the drainage end of the large cross-way on the well through the oil pipe, and the well fluid and gas are pumped to the ground through the reciprocating motion of the submersible linear motor; Step S3.4, protecting the mover and the connection housing of the submersible linear motor: during the reciprocating motion of the mover of the submersible linear motor, a pair of buffer structures are used to buffer the motion of the mover neodymium magnet of the submersible linear motor, thereby protecting the mover and the connection housing; Step S4, liquid-gas separation: during the upward movement of the mover of the submersible linear motor, the well fluid and the gas enter the liquid-gas separation device together, and after the liquid-gas separation sieve hole in the liquid-gas separation device is separated once, during the downward movement of the mover of the submersible linear motor, the liquid and gas entering the mover of the submersible linear motor are subjected to secondary liquid-gas separation through the gas anchor sieve pipe, so that most of the target gas enters the annulus between the gas production casing and the equipment, and the gas is discharged through the exhaust end of the large four-way on the well; Step S5, equipment cleaning: During the gas production process, the electric power is released downward by the submersible linear motor, and the gas production cleaning structure is driven by the rotating coil, so that the rotating ring drives the cleaning rod to rotate, and the cleaning bristles of the cleaning rod are used to clean the liquid-gas inlet hole and the liquid-gas separation sieve hole.

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