A hydraulic drainage pump and a gas well production method

Abstract

The present invention discloses a hydraulic drainage pump and a gas well exploitation method thereof, which relate to the technical field of gas well exploitation. The hydraulic drainage pump includes: a hollow sucker rod is arranged in a tubing and connected to a high-pressure water pump, and power fluid formed by the high-pressure water pump enters a drainage device through the hollow sucker rod; the drainage device is arranged at the lower end of the hollow sucker rod, and the hollow sucker rod is inserted into the drainage device. The drainage device has a drainage pipe, and the bottom inlet diameter of the drainage pipe is larger than the top outlet diameter; the power fluid is sprayed into the drainage device through a power end injector, enters from the bottom inlet of the drainage pipe, and then sprays out from the top outlet of the drainage pipe to form a negative pressure chamber, so that the high flow rate drains the low flow rate water in the formation, solving the technical problem that it is difficult to control the water seal height in the exploitation of natural gas or coalbed methane in the prior art, thereby affecting the exploitation effect. It achieves the technical effect of effectively improving the gas production of the gas well by adjusting the pressure of the high-pressure water pump to adjust the water seal height as required.

Description

Technical Field

[0001] The present invention relates to the technical field of gas well exploitation, and particularly to a hydraulic drainage pump and a gas well exploitation method thereof. Background Art

[0002] Natural gas or coalbed methane is stored underground in pores or fractures and is accompanied by interlayer water or groundwater. In gas exploitation, it is necessary to drain water to produce gas. When the water volume is large, a static water column pressure is formed in the wellbore, which forms a water seal for the formation gas, blocking gas production and seriously affecting the gas production of a single well. When the static water column pressure is too small, the production pressure difference is too large, and a large amount of sand or coal dust is discharged from the sand or capillary pores in the formation fracture, deposited in the wellbore, and the amount of sand or dust is large, which is easy to jam the pump and block the gas supply channel.

[0003] In the exploitation of natural gas or coalbed methane wells, most are self-jet or suction exploitation. In suction exploitation, the speed of the suction volume determines the size of the water column pressure, but it is difficult to control the water seal height, which affects the gas production. It is necessary to reasonably reduce the water seal. However, when the water seal is high, the gas production is low, and when the water seal is small, sand is easily produced. How to effectively control the water seal height is a difficult problem encountered in exploitation. Summary of the Invention

[0004] The purpose of this application is to provide a hydraulic drainage pump and a gas well exploitation method thereof, aiming to solve the technical problem in the prior art that the water seal height is difficult to control in the exploitation of natural gas or coalbed methane, thus affecting the exploitation effect.

[0005] In view of the above problems, this application provides a hydraulic drainage pump and a gas well exploitation method thereof.

[0006] In the first aspect, this application provides a hydraulic drainage pump. The hydraulic drainage pump is applied to the exploitation of natural gas and coalbed methane. The hydraulic drainage pump includes: a hollow sucker rod, which is arranged in the tubing and connected to a high-pressure water pump, and the power fluid formed by the high-pressure water pump enters the bottom of the tubing through the hollow sucker rod; a flow guide device, which is arranged at the lower end of the hollow sucker rod, and the hollow sucker rod is inserted into the flow guide device. The flow guide device has a flow guide pipe, and the bottom inlet diameter of the flow guide pipe is larger than the top outlet diameter; a power end injector, which is arranged at the bottom end of the hollow sucker rod, and the power fluid is sprayed into the flow guide device through the power end injector; a negative pressure chamber, which is located between the hollow sucker rod and the empty tubing, and the negative pressure chamber is connected to the top outlet of the flow guide pipe; wherein, the power fluid enters from the bottom inlet of the flow guide pipe and then sprays out from the top outlet of the flow guide pipe to form the negative pressure chamber.

[0007] Preferably, the hydraulic drainage pump further includes: a casing, which is arranged outside the tubing, and there is a gap between the casing and the tubing.

[0008] Preferably, the hollow sucker rod is radially movable relative to the tubing.

[0009] Preferably, there are multiple drainage pipes.

[0010] Preferably, the diameter of the top outlet of the drainage pipe is 3-15 mm.

[0011] Preferably, the hollow sucker rod is φ36-48 mm.

[0012] Preferably, the hollow sucker rod has a certain toughness.

[0013] Preferably, the discharge of the high-pressure water pump is adjustable, wherein the discharge is 0-150 m 3 / d.

[0014] In a second aspect, the present application also provides a method for gas well exploitation using a hydraulic drainage pump. The method is applied to the hydraulic drainage pump described in the first aspect and includes: lowering an empty tubing to a predetermined position according to the size of the gas well submergence degree, where the predetermined position matches the size of the gas well submergence degree; lowering the hydraulic drainage pump into the empty tubing to the bottom of the empty tubing; pumping power fluid into the hollow sucker rod of the hydraulic drainage pump through a ground high-pressure water pump to enter the drainer as drainage power fluid to form a static water column; adjusting the pressure of the high-pressure water pump according to the gas well exploitation requirements, and synchronously adjusting the negative pressure of the drainage power fluid to change the height of the static water column and complete the control of the dynamic liquid level of the gas well.

[0015] Preferably, the method further includes: lowering the hydraulic drainage pump to the sand and dust accumulation area of the gas well; using the hydraulic drainage pump to drain the sand and dust to the ground for sand cleaning.

[0016] One or more technical solutions provided in the present application have at least the following technical effects or advantages:

[0017] The technical solution provided in the present application is connected to the high-pressure water pump through the hollow sucker rod. The power fluid formed by the high-pressure water pump enters the drainer through the hollow sucker rod, enters from the bottom inlet of the drainage pipe, and then sprays out from the top outlet of the drainage pipe to form the negative pressure chamber between the hollow sucker rod and the empty tubing. Under the action of the negative pressure chamber, low-pressure and low-flow formation fluid is induced into the negative pressure chamber. After the high- and low-pressure liquids are mixed, under the action of the high flow rate, the liquid is lifted to the ground. By adjusting the pressure of the high-pressure water pump, the adjustment of the water seal height is realized, meeting the design requirements for the water seal height, and effectively improving the gas production of the gas well. Thus, the technical problem in the prior art that it is difficult to control the water seal height in the exploitation of natural gas or coalbed methane, which affects the exploitation effect, is solved.

[0018] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the specific embodiments of this application are given below. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0020] Figure 1 Schematic structural diagram of a hydraulic drainage pump provided by an embodiment of this application;

[0021] Figure 2 Schematic diagram of the pipe string formation of the hydraulic drainage pump in an embodiment of this application;

[0022] Figure 3 Schematic diagram of the formation for hydraulic drainage pump exploitation in an embodiment of this application;

[0023] Figure 4 Schematic flow diagram of a method for gas well exploitation using a hydraulic drainage pump provided by an embodiment of this application.

[0024] Description of the reference numerals: tubing 1, hollow sucker rod 2, drainer 3, negative pressure chamber 4, bottom inlet of the drain pipe 5, top outlet of the drain pipe 6, hydraulic drainage pump 10, christmas tree 20, filter water tank 30, metering station 40, filter 31, high-pressure booster pump 32, gas-liquid separator 33. Detailed Embodiments

[0025] This application provides a hydraulic drainage pump and a method for gas well exploitation thereof, aiming to solve the technical problem in the prior art that it is difficult to control the water seal height in the exploitation of natural gas or coalbed methane, thereby affecting the exploitation effect. It achieves the technical effect of adjusting the water seal height as needed and effectively improving the gas production of gas wells.

[0026] In the technical solution of this application, the acquisition, storage, use, processing, etc. of data all comply with the relevant provisions of national laws and regulations.

[0027] Next, the technical solutions in the present application will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited by the exemplary embodiments described herein. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application. Additionally, it should be noted that for the sake of description, only the parts related to the present application are shown in the drawings, rather than all of them.

[0028] Embodiment 1

[0029] As Figure 1 shown, the present application provides a hydraulic drainage pump, which is applied to the exploitation of natural gas and coalbed methane, and is a special hydraulic drainage pump 10 for natural gas and coalbed methane. The hydraulic drainage pump 10 includes: a hollow sucker rod 2, a drainer 3, a power end injector, and a negative pressure chamber 4.

[0030] The hollow sucker rod 2 is arranged inside the tubing 1 and is connected to a high-pressure water pump, and the power fluid formed by the high-pressure water pump enters the bottom of the tubing through the hollow sucker rod 2.

[0031] Specifically, a high-pressure water pump provides pressure for the power fluid, and the pressure of the high-pressure water pump is adjustable. The pressure of the power fluid is adjusted by adjusting the pressure of the high-pressure water pump. Among them, the power fluid can be clear water or formation-produced sewage. The high-pressure water pump forms high-pressure and fast power fluid, which enters the drainer 3 located at the bottom of the tubing through the hollow sucker rod 2.

[0032] The drainer 3 is arranged at the lower end of the hollow sucker rod 2, and the hollow sucker rod 2 is inserted into the drainer 3. The drainer 3 has a drain pipe, and the diameter of the bottom inlet 5 of the drain pipe is larger than the diameter of the top outlet 6.

[0033] The power end injector is arranged at the outlet end of the hollow sucker rod 2, and the power fluid is sprayed into the drainer 3 through the power end injector.

[0034] Furthermore, the number of the drain pipes is multiple, preferably 3.

[0035] Furthermore, the diameter of the top outlet 6 of the drain pipe is 3 - 15 mm.

[0036] Specifically, after the power fluid is pressurized by a high-pressure water pump, it becomes high-pressure power fluid and enters the flow guide device 3 through the hollow sucker rod 2. Through multiple, preferably 3, flow guide pipes provided in the flow guide device 3, a negative pressure chamber is formed by jetting. The high-pressure power fluid mixed with the formation produced fluid enters from the bottom inlet 5 of the flow guide pipe and jets out through the top outlet 6 of the flow guide pipe. Among them, the flow guide pipe is a conical structure that is wider at the bottom and narrower at the top, which is convenient for high-pressure jetting. At the same time, the diameter of the top outlet 6 is 3-15 mm, which is several times larger than the sand grain size, and sand plugging will not occur.

[0037] The negative pressure chamber 4 is located between the hollow sucker rod 2 and the empty oil pipe 1, and the negative pressure chamber 4 is connected to the top outlet 6 of the flow guide pipe; among them, the power fluid enters from the bottom inlet 5 of the flow guide pipe and then jets out from the top outlet 6 of the flow guide pipe to form the negative pressure chamber 4.

[0038] Specifically, the high-pressure and fast power fluid enters the flow guide device 3 and then is jetted into the empty oil pipe 1 through the power end injector of the hydraulic flow guide pump, forming a negative pressure chamber 4 between the empty oil pipe 1 and the hollow sucker rod 2. After the flow guide device forms a negative pressure, the high-flow-rate formation fluid with low flow rate is drained. After the formation water flow rate increases, the production of formation sand and coal dust is increased. However, the large diameter of the drainage jet orifice of the flow guide device can jet the formation sand or coal dust between the hollow rod and the oil pipe and lift it to the formation; under the action of the flow guide device, there is never blockage or gas lock in the well. The drainage water is the formation produced water. After passing through the surface sand-water separation box, the sand or dust is filtered and separated and deposited and removed through the sand settling tank. The filtered water is pumped into the hollow sucker rod by a high-pressure pump and forms drainage through the flow guide device. Through the above process, the high-pressure and high-flow-rate liquid drains the low-pressure and low-flow-rate formation fluid. The size of the drainage volume and the pressure determine the jetting force of the liquid drainage pump, which determines the size of the single-well liquid column. Without using a pumping unit, the liquid can be drained to produce gas, and reducing the static water column pressure of the gas well can increase the single-well gas production.

[0039] Among them, under the action of the negative pressure chamber, the low-pressure and low-flow-rate formation fluid is induced to enter the negative pressure chamber. After the high- and low-pressure liquids are mixed to form a mixed liquid, under the action of the fast flow rate, the liquid is lifted to the ground and returns to the ground from the empty oil pipe. By adjusting the pressure of the high-pressure water pump, the pressure of the power fluid can be adjusted, so that the height of the water seal can be changed, and the control of the gas production volume can be realized. The technical effect of adjusting the height of the water seal as needed and effectively increasing the gas production volume of the gas well is achieved. Thus, the technical problem in the prior art that it is difficult to control the height of the water seal in the exploitation of natural gas or coalbed methane, which affects the exploitation effect, is solved.

[0040] Further, the hydraulic flow guide pump 10 further includes: a casing, the casing is arranged outside the oil pipe 1, and there is a gap between the casing and the oil pipe 1.

[0041] Specifically, when the hydraulic drainage pump 10 is used for drainage production, high-pressure power fluid enters the drainer 3 through the hollow sucker rod 2, mixes with the formation produced fluid, and then returns to the ground through the tubing 1. The gas rises to the ground through the annular clearance between the tubing 1 and the casing, without affecting each other, ensuring the effective production of the gas well.

[0042] Further, the hollow sucker rod 2 is radially movable relative to the tubing 1.

[0043] Specifically, when the hydraulic drainage pump 10 needs to be overhauled, only by lifting the hollow sucker rod 2 can the overhaul and replacement be completed, without using the tubing string, with low cost and convenient overhaul.

[0044] Further, the hollow sucker rod 2 is made of a material with certain toughness.

[0045] Specifically, the hollow sucker rod 2 has high toughness and a small diameter. It can pass through the build-up section and enter the horizontal section in the deep part of the gas well, and can enter the sand accumulation area of the gas well for sand cleaning, solving the problems of sand production and severe dust blockage of the channel in the gas well.

[0046] Further, the hydraulic drainage pump 10 can remove the sand grains or dust blockage in the wellbore. During the production process of a single well, the degree of various sediment blockages caused by sand or dust is different, and the blockage points are different. According to the requirements of Party A, the length of the hollow sucker rod 2 can be extended in sections to carry out cleaning and unblocking treatment for vertical wells, directional wells, and horizontal wells.

[0047] Further, the hollow sucker rod 2 is φ36 - 48 mm.

[0048] Further, the displacement of the high-pressure water pump can be adjusted, where the displacement is 0 - 150 m 3 / d.

[0049] Preferably, the technical parameters of the hydraulic drainage pump 10 are:

[0050] The working barrel of the drainage pump is φ102 mm * 0 - 6000 m, the tubing size is 2 7 / 8 - 3 1 / 2, the drainage pump displacement is 0 - 150 m 3 / d (adjustable), the maximum lift of the power fluid is 5 - 45 MPa, the depth of the hydraulic drainage pump is ≥6000 meters, the power fluid sand and dust separation tank is 6 ㎡ - 20 ㎡, the power fluid pump motor is 17 kW - 75 kW, the hollow rod for introducing the power fluid is φ36 - 48 mm, and the injection nozzle is 5 - 15 mm.

[0051] Embodiment 2

[0052] The embodiment of the present application provides a gas well production method using a hydraulic drainage pump. The implementation process of using the hydraulic drainage pump in Embodiment 1 for gas well production is as Figure 4As shown in the figure, it is a schematic flow chart of a method for gas well exploitation using a hydraulic drainage pump. The method includes:

[0053] S10: Lower the empty tubing to a predetermined position according to the gas well submergence degree, where the predetermined position matches the gas well submergence degree;

[0054] S20: Connect the hydraulic drainage pump 10 to the empty tubing and reach the designed position at the bottom of the empty tubing 1;

[0055] S30: Pump the power fluid into the hollow sucker rod 2 of the hydraulic drainage pump 10 through a ground high-pressure water pump, and use it as the drainage power fluid to enter the drainer 3 to form high- and low-pressure drainage and form a jet;

[0056] S40: According to the gas well exploitation requirements, adjust the pressure of the high-pressure water pump and synchronously adjust the negative pressure of the drainage power fluid, change the height of the static water column, and reduce the suppression of the static water column pressure on the formation gas to complete the control of the gas well production volume.

[0057] Specifically, according to the gas well submergence degree, design according to the requirements of Party A, lower the empty tubing 1 to a predetermined position. Inside the empty tubing 1, the hollow sucker rod 2 with the hydraulic drainage pump 10 reaches the bottom of the tubing 1 and is inserted into the drainer 3 at the bottom. On the ground, use a high-pressure water pump to pump clean water or sewage as the power fluid into the hollow sucker rod 2, and use it as the drainage power fluid to enter the hydraulic drainage pump 10. It is sprayed into the empty tubing 2 through the injector at the power end of the hydraulic drainage pump 10. A negative pressure chamber is formed between the empty tubing and the hollow sucker rod to complete high-pressure and high-velocity drainage fluid. The drainage water is the formation produced water. Through the high-pressure and high-velocity drainage of the low-pressure and low-velocity formation fluid, the size of the drainage volume and the pressure determine the injection force of the liquid drainage pump, which determines the single-well production volume. Without using a pumping unit, drainage and gas production can be completed, reducing the static water column pressure of the gas well and increasing the single-well gas production. By adjusting the pressure of the power fluid, the height of the static water column, that is, the water seal, can be adjusted, so as to realize the control of the gas well gas production volume. The technical effect of adjusting the height of the water seal as needed and effectively increasing the gas well production volume is achieved. Thus, the technical problem in the prior art that it is difficult to control the water seal height in the exploitation of natural gas or coalbed methane, which affects the exploitation effect, is solved.

[0058] When using the hydraulic drainage pump 10 for gas well exploitation, the schematic diagram of the exploited formation is as Figure 3 shown. Connect the hydraulic drainage pump 10 to the Christmas tree 20 and place it in the pre-set gas production casing. Set it to the corresponding position according to the requirements of Party A's single-well submergence degree. According to the gas production demand, adjust the negative pressure. The suction force is strong and sand plugging is not easy to form at the bottom of the well. The static water column pressure is small, which can make the formation gas produce quickly and increase the single-well gas production volume. The static water column pressure between the tubing and the hollow rod is borne by the negative pressure chamber and does not cause pressure on the formation.

[0059] Meanwhile, the liquid output end of the hydraulic drainage pump 10 is connected to the filtration water tank 30 on the ground. The filtration water tank 30 is connected to the gas-liquid separator 33 and the filter 31. As Figure 2 shown, the formation produced fluid can pass through the ground and the settling tank, and the gas-liquid separator 33 is used to separate gas, liquid, sand and dust. The sand and dust are deposited in the sedimentation tank. After the sediment is removed or the dust is removed, the liquid enters through the impurity sand filter 31. The water tank supplies the high-pressure booster pump 32 for secondary utilization. The excess part can also be pumped into the external pipeline for gas and liquid transportation to the end metering station 40. The sand can be quantitatively removed. After forming a virtuous cycle, the static water column pressure is reduced and the single-well output is increased.

[0060] Furthermore, the method further includes:

[0061] S50: Lower the hydraulic drainage pump 10 to the sand and dust accumulation area of the gas well;

[0062] S60: Use the hydraulic drainage pump 10 to drain the sand and dust to the ground for sand cleaning.

[0063] Specifically, during the normal production process of the gas well, when the water seal is small, the gas production is large, and the discharge amount of formation sand, fracturing sand or coal dust is too large, which is easy to cause pump jamming, and it is easy to form sand blockage or coal dust blockage in the liquid supply pipeline, seriously affecting the gas supply channel flow rate and resulting in too low single-well gas production. Party A needs to remove sand or coal dust and clear the gas supply channel, but the cost is high. The gas well exploitation method using the hydraulic drainage pump in this application can adjust the height of the water seal through the high-pressure water pump on the ground, improve the gas well exploitation volume, and the channel of the drainer is large and there will be no sand blockage. At the same time, due to its toughness, the hydraulic drainage pump 10 can also be lowered through the deviated section or into the horizontal section to regularly remove the formation sand in the gas well, effectively solving the problems of difficult cleaning and high cost of blockage in the gas supply channel in the prior art.

[0064] In summary, a hydraulic drainage pump and its gas well exploitation method disclosed in the embodiments of this application have the following technical effects:

[0065] 1. Inject the power liquid into the drainer through the high-pressure water pump on the ground. After the high-pressure and fast power liquid enters the drainer, under the action of the negative pressure chamber, the low-pressure and low-flow formation liquid is induced into the negative pressure chamber to form a high-low pressure mixed liquid. Under the action of the fast flow rate, the liquid is lifted to the ground. By adjusting the pressure of the high-pressure water pump, the adjustment of the water seal height is realized, thereby increasing the exploitation volume of the gas well.

[0066] 2. The high-pressure power liquid enters the drainer through the hollow sucker rod, is mixed with the formation produced fluid and returns to the ground through the oil pipe. The gas rises to the ground through the annular space between the oil pipe and the casing, realizing gas-liquid separation and ensuring the exploitation volume of the gas well.

[0067] 3. The internal channel of the drain is large, and the diameter of the top outlet of the drainage tube is much larger than the particle size of the sand, which avoids blockage and air lock.

[0068] 4. The hydraulic drainage pump is movable between the oil pipe. When a fault occurs, there is no need to use the pipe string. You only need to lift the hollow sucker rod to inspect or replace it, which simplifies the maintenance process and improves the efficiency of gas production.

[0069] 5. The hollow sucker rod has a small diameter and high toughness. It can be lowered through the inclined section or into the horizontal section to remove sand and dust in the gas well, solving the problem of sand and dust seriously blocking the channel in the gas well.

[0070] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for gas well exploitation using a hydraulic drainage pump, characterized in that, The method is applied to a hydraulic drainage pump, which is applied to the exploitation of natural gas and coalbed methane. The hydraulic drainage pump comprises: A hollow sucker rod, which is arranged inside the tubing and connected to a high-pressure water pump, and the power fluid formed by the high-pressure water pump enters the flow guide through the hollow sucker rod. A flow guide, which is arranged at the lower end of the hollow sucker rod, and the hollow sucker rod is inserted into the flow guide. The flow guide has a flow guide pipe, and the diameter of the bottom inlet of the flow guide pipe is larger than that of the top outlet. A power-end injector, which is arranged at the bottom end of the hollow sucker rod, and the power fluid is sprayed into the flow guide through the power-end injector. A negative pressure chamber, which is located between the hollow sucker rod and the tubing, and the negative pressure chamber is connected to the top outlet of the flow guide pipe. Wherein, the power fluid enters from the bottom inlet of the flow guide pipe and then sprays out from the top outlet of the flow guide pipe to form the negative pressure chamber. The displacement of the high-pressure water pump is adjustable, wherein the displacement is 0 - 150 m³ / d, and there are multiple flow guide pipes. The diameter of the top outlet of the flow guide pipe is 3 - 15 mm, and the diameter of the top outlet of the flow guide pipe is much larger than the particle size of the sand. Wherein, the method comprises: According to the size of the gas well submergence degree, the tubing is lowered to a predetermined position, wherein the predetermined position matches the designed size of the gas well submergence degree. The hollow sucker rod is arranged inside the tubing, and the flow guide is placed at the designed position at the bottom of the tubing. The power fluid is pumped into the hollow sucker rod of the hydraulic drainage pump device through the ground high-pressure water pump and enters the flow guide as the power fluid to form a jet. According to the gas well exploitation requirement, the pressure of the high-pressure water pump is adjusted, and the negative pressure of the power fluid is adjusted synchronously to change the height of the static water column and complete the control of the dynamic liquid level of the gas well.

2. The gas well exploitation method of the hydraulic drainage pump according to claim 1, characterized in that, The hydraulic drainage pump device further comprises: A casing, which is arranged outside the tubing, and there is a gap between the casing and the tubing.

3. The gas well exploitation method of the hydraulic drainage pump according to claim 1, characterized in that, The hollow sucker rod can axially move relative to the tubing. When the hydraulic drainage pump needs to be overhauled, the hollow sucker rod is lifted.

4. The gas well exploitation method of the hydraulic drainage pump according to claim 1, characterized in that, The hollow sucker rod is φ36 - 48 mm and has toughness.

5. The gas well exploitation method of the hydraulic drainage pump according to claim 1, characterized in that The method further comprises: Lowering the hydraulic drainage pump to the sand-type dust accumulation area of the gas well. Using the hydraulic drainage pump to drain the sand-type dust to the ground for sand cleaning.

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