Deep well gas production pipe internal jet drainage device and use method

Abstract

The present invention relates to the technical field of oil and gas well exploitation, and in particular to a jet drainage device in a deep well gas production pipe column and a method for using the device. The technical scheme is as follows: a pressure-controlled switch jet suction pump and a reverse circulation drainage pump are connected and lowered into the oil pipe through a small-diameter oil pipe, the pressure-controlled switch jet suction pump is located in the middle and upper part of the oil and gas well, the reverse circulation drainage pump is located in the lower part of the oil and gas well, a packer is installed below the reverse circulation drainage pump, and a check valve is installed at the bottom; by injecting high-pressure gas into the small-diameter oil pipe, the water in the upper pipe column of the pressure-controlled switch jet suction pump is discharged, and after the discharge, the sliding sleeve moves to close the outlet of the mixed liquid; then, by injecting high-pressure gas into the annulus between the casing and the oil pipe, the water in the upper pipe column of the reverse circulation drainage pump is discharged, and the liquid in the pipe column is lifted by multi-stage relay jets, and the water accumulated at the bottom of the well and the water stored in the pipe column are discharged to the ground, so as to effectively reduce the back pressure at the bottom of the well and release water blockage and water lock, and restore the gas well production capacity.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas well exploitation, and in particular to a jet drainage device in a deep well gas production pipe column and a use method thereof. Background Art

[0002] During the exploitation of deep gas wells, with the gradual decrease in formation pressure and the increase in water output, the carrying and clearing effect of gas production on the water accumulated at the bottom of the well is gradually weakened, resulting in a decrease in gas production or shutdown due to water accumulation at the bottom of the well, especially for deep wells, ultra-deep wells, wells that are prone to water lock, and wells with high levels of corrosive and toxic gases, which are not suitable for lifting out the existing gas production pipes in the well. Due to the constraints of factors such as the diameter of the production pipe in the well, the depth of water accumulation at the bottom of the well, and the formation pressure, the existing drainage and unblocking technologies, such as bubble drainage, plunger drainage, gas lift, submersible electric pump drainage, submersible screw pump, and rod pump drainage, have been difficult to adapt to the needs of such wells in the middle and late development stages. Some wells are gradually in a state of low production and low efficiency or are forced to be shut down. New, more economical and effective devices are needed to drain water and produce gas without moving the existing production pipes in the well. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned defects of the prior art and to provide a deep well gas production string internal jet drainage device and a method of use. The device lifts the liquid in the string through multi-stage relay jets to drain the bottom water to the ground, thereby effectively reducing the bottom back pressure and relieving water blockage and water lock, thereby restoring the gas well production capacity.

[0004] The present invention mentions a deep well gas production pipe string jet drainage device, and its technical scheme is: comprising casing, oil pipe and reverse circulation drainage pump, wherein a pressure-controlled switch jet suction pump and a reverse circulation drainage pump are connected and lowered into the oil pipe through a small-diameter oil pipe, the pressure-controlled switch jet suction pump is located in the middle and upper part of the oil and gas well, and the reverse circulation drainage pump is located in the lower part of the oil and gas well, a packer is installed below the reverse circulation drainage pump, and a check valve is installed at the bottom; the pressure-controlled switch jet suction pump comprises a floating pump core, a pump barrel, a first spring, and a sliding sleeve, the floating pump core is installed in the pump barrel, and the first spring and the sliding sleeve are arranged on the outside of the pump barrel, and the switch control of the mixed liquid outlet is realized by the sliding sleeve; by injecting high-pressure gas into the small-diameter oil pipe, the water in the upper pipe string of the pressure-controlled switch jet suction pump is discharged, and after emptying, the sliding sleeve moves to close the mixed liquid outlet; and then by injecting high-pressure gas into the annulus between the casing and the oil pipe, the water in the upper pipe string of the reverse circulation drainage pump is discharged.

[0005] Preferably, the above-mentioned pressure-controlled switch jet suction pump also includes a first nozzle, a first throat, and a liquid inlet valve. A supporting step is provided on the upper part of the inner wall of the pump barrel, which is cooperated and connected with the upper protrusion of the floating pump core. A first salvaging head is installed on the top of the floating pump core, and a first inlet is installed on the upper side of the floating pump core. A first nozzle is provided at the lower part of the floating pump core, and a first throat is provided below the first nozzle. The lower part of the first throat is connected to the diffusion chamber, and a mixed liquid outlet is provided at the lower part of the diffusion chamber. The liquid inlet valve is installed at the lower end of the pump barrel.

[0006] Preferably, the above-mentioned reverse circulation drainage pump includes a pump body, a second throat, a second nozzle, and a second power fluid inlet. The second power fluid inlet is provided on the lower side of the pump body, and the second power fluid inlet is connected to the second nozzle in the inner cavity of the pump body. A second throat is provided above the second nozzle, and a discharge port is provided on the top of the pump body. The bottom of the pump body is a liquid inlet, and a second leather cup is installed on the outside of the liquid inlet.

[0007] Another deep well gas production pipe internal jet drainage device mentioned in the present invention has a technical solution as follows: the floating pump core includes an annular spray column, an annular throat column, a second salvage head, a support column, and a positioning column. The lower part of the second salvage head is connected to the annular spray column, and the lower part of the annular spray column is connected to the support column through the annular throat column. A positioning column is provided at the lower end of the support column. The outer diameter of the annular spray column is larger than the outer diameter of the annular throat column, and the outer diameter of the support column is larger than the outer diameter of the positioning column.

[0008] Preferably, the above-mentioned annular spray column and the inner wall of the pump barrel form the first nozzle of the annular spray structure, and the annular throat column and the inner wall of the pump barrel form the first throat of the annular spray structure. A diffusion chamber is provided below the first throat, and a liquid inlet channel is provided on one side of the inner wall of the pump barrel. The lower end of the liquid inlet channel is connected to the formation fluid inlet, and the upper end is connected to the lower part of the first nozzle of the annular spray structure. After the formation fluid is mixed with the power fluid from above, it passes through the first throat and the diffusion chamber and is discharged along the mixed liquid outlet provided on the outer wall of the pump barrel.

[0009] Another deep well gas production pipe internal jet drainage device mentioned in the present invention has a technical solution of: installing a one-way pressure-controlled bleeder on the small-diameter oil pipe between the pressure-controlled switch jet suction pump and the reverse circulation drainage pump.

[0010] Preferably, the above-mentioned one-way pressure-controlled bleeder includes a bleeder body, an inner sleeve, a leakage hole, a second spring, an upper joint, and a lower joint. The upper end of the bleeder body is provided with an upper joint, and the lower end is provided with a lower joint. The upper middle part of the bleeder body is provided with a leakage hole, and an inner sleeve and a second spring are provided in the inner cavity of the bleeder body. The lower end of the inner sleeve is connected to the second spring, and the lower part of the inner sleeve is provided with a boss structure.

[0011] Preferably, the inner diameter of the upper part of the inner wall of the above-mentioned bleeder body is smaller than the inner diameter of the lower part, and an adjustment ring is provided at the lower part of the inner wall of the bleeder body, and the upper part of the adjustment ring is connected to the lower end of the second spring.

[0012] The method for using the jet drainage device in the deep well gas production pipe string mentioned in the present invention comprises the following process:

[0013] First, a pressure-controlled switch jet suction pump and a reverse circulation drainage pump are connected and lowered into the oil pipe through a small-diameter oil pipe. The pressure-controlled switch jet suction pump is located in the middle and upper part of the oil and gas well, and the reverse circulation drainage pump is located in the lower part of the oil and gas well, and the packer is set;

[0014] Second, adjust the wellhead and ground gas injection process, inject high-pressure gas into the small-diameter oil pipe, the high-pressure gas enters the floating pump core of the pressure-controlled switch jet suction pump along the first inlet, and then sprays out along the first nozzle, driving the liquid entering from the liquid inlet valve to mix with gas and liquid in the first throat pipe, and then passes through the mixed liquid outlet downward along the diffusion cavity to be discharged to the annulus between the floating pump core and the pump barrel, the sleeve is opened, and then the mixed liquid outlet on the outer wall of the pump barrel is discharged to the annulus between the small-diameter oil pipe and the oil pipe, and the gas-liquid mixture is lifted upward to the ground until the annulus between the small-diameter oil pipe and the oil pipe is emptied, thereby realizing the emptying of the liquid on the upper part of the pressure-controlled switch jet suction pump; after emptying, the sleeve moves under the action of the first spring to close the mixed liquid outlet;

[0015] Thirdly, high-pressure gas is injected into the annulus between the oil pipe and the small-diameter oil pipe through the surface gas injection process. The high-pressure gas continues to push the liquid in the annulus between the oil pipe and the small-diameter oil pipe below the pressure-controlled switch jet suction pump to move downward, and enters the second nozzle through the second power fluid inlet of the reverse circulation drainage pump at the deep well to spray out, driving the formation liquid at the liquid inlet to mix, and upward along the second throat pipe to be discharged through the discharge port. The mixed liquid goes upward along the small-diameter oil pipe, passes through the liquid inlet valve of the pressure-controlled switch jet suction pump and enters the pump barrel. At this time, the sleeve is in a closed state, and the liquid mixture is discharged upward along the pump barrel and the floating pump core until it is discharged to the ground, completing the complete replacement of the liquid in the inner cavity of the oil pipe.

[0016] Fourth, stop injecting high-pressure gas at this time. Since the liquid in the inner cavity of the oil pipe is completely drained, under the pressure of the gas-producing formation, the gas production opens the check valve and flows out along the oil pipe to the ground, resuming gas production in the deep well.

[0017] Another method for using a jet drainage device in a deep well gas production pipe string mentioned in the present invention comprises the following steps:

[0018] First, a pressure-controlled switch jet suction pump and a reverse circulation drainage pump are connected and lowered into the oil pipe through a small-diameter oil pipe. The pressure-controlled switch jet suction pump is located in the middle and upper part of the oil and gas well, and the reverse circulation drainage pump is located in the lower part of the oil and gas well, and the packer is set;

[0019] Second, adjust the wellhead and ground gas injection process, inject high-pressure gas into the small-diameter oil pipe, the high-pressure gas enters the floating pump core of the pressure-controlled switch jet suction pump along the first inlet, and then sprays out along the first nozzle, driving the liquid entering from the liquid inlet valve to mix gas and liquid in the first throat pipe, and then pass through the mixed liquid outlet downward along the diffusion cavity to be discharged to the annulus between the floating pump core and the pump barrel, the sleeve is opened, and then the mixed liquid outlet on the outer wall of the pump barrel is discharged to the annulus between the small-diameter oil pipe and the oil pipe, the gas-liquid mixture is lifted upward to the ground until the annulus between the small-diameter oil pipe and the oil pipe is emptied, thereby realizing the emptying of the liquid on the upper part of the pressure-controlled switch jet suction pump; after emptying, the sleeve moves under the action of the first spring to close the mixed liquid outlet;

[0020] Third, high-pressure gas is injected into the annulus between the oil pipe and the small-diameter oil pipe through the ground gas injection process. The high-pressure gas continues to push the liquid in the annulus between the oil pipe and the small-diameter oil pipe below the pressure-controlled switch jet suction pump to move downward, and enters through the leakage hole of the one-way pressure-controlled bleeder, and pushes the inner sleeve to open. The high-pressure gas pushes the liquid in the inner cavity of the small-diameter oil pipe above the one-way pressure-controlled bleeder to be discharged upward, and enters the pump barrel through the liquid inlet valve of the pressure-controlled switch jet suction pump. At this time, the sleeve is in a closed state, and the liquid mixture is discharged upward along the pump barrel and the floating pump core until it is discharged to the ground, completing the replacement of the liquid in the inner cavity of the oil pipe and the small-diameter oil pipe above the one-way pressure-controlled bleeder;

[0021] Fourth, high-pressure gas is injected into the annulus between the oil pipe and the small-diameter oil pipe through the surface gas injection process. The high-pressure gas continues to push the liquid in the annulus between the oil pipe and the small-diameter oil pipe below the pressure-controlled switch jet suction pump to move downward, and enters the second nozzle through the second power fluid inlet of the reverse circulation drainage pump at the deep well to spray out, driving the formation liquid at the liquid inlet to mix, and upward along the second throat pipe through the discharge port to be discharged. The mixed liquid goes upward along the small-diameter oil pipe, passes through the lower joint of the one-way pressure-controlled discharger, and the inner sleeve is in a closed state at this time. The liquid mixture is discharged upward along the inner cavity of the discharger body, and then continues to go upward along the small-diameter oil pipe, passes through the liquid inlet valve of the pressure-controlled switch jet suction pump and enters the pump barrel. At this time, the sleeve is in a closed state, and the liquid mixture is discharged upward along the pump barrel and the floating pump core until it is discharged to the ground, completing the complete replacement of the liquid in the inner cavity of the oil pipe.

[0022] Fifth, stop injecting high-pressure gas at this time. Since the liquid in the inner cavity of the oil pipe is completely drained, under the pressure of the gas-producing formation, the gas production opens the check valve and is produced along the oil pipe to the ground, resuming gas production in the deep well.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] The present invention uses a small-diameter oil pipe to connect and lower a pressure-controlled switch jet suction pump and a reverse circulation drainage pump without using the existing gas production pipe string of the gas well, and introduces high-pressure gas to empty the water in the pipe string above the pressure-controlled switch jet suction pump, and then introduces high-pressure gas to replace the water in the pipe string above the reverse circulation drainage pump, thereby restoring the gas production of the deep well. The alternating cycle of drainage and gas production of the deep gas well can be achieved without moving the downhole pipe string; the cross-sectional area of ​​the new gas production flow channel after the drainage pipe string is lowered into the original gas production pipe string is reduced horizontally, which is more conducive to improving the carrying and lifting efficiency of the gas on the downhole water, and can greatly improve its self-drainage capacity, and reduce the water accumulation at the bottom of the well;

[0025] Second, the use of a floating pump core that is thick at the top and thin at the bottom can allow the floating pump core to float upward a little during backwashing, thereby enlarging the backwashing flow channel and reducing the resistance of the floating pump core, thereby ensuring a faster backwashing speed and reducing the pressure of backwashing construction;

[0026] 3. The pressure-controlled switch jet suction pump used in the present invention can also be designed as a ring spray structure, which has a novel structure, small liquid-gas flow resistance, and the floating pump core of the jet pump is easy to cast and fish, convenient to operate and manage, low cost, and also conducive to increasing the maintenance-free period of the gas well;

[0027] Fourth, the present invention adds a one-way pressure-controlled bleeder between the pressure-controlled switch jet suction pump and the reverse circulation drainage pump, so that the liquid between the pressure-controlled switch jet suction pump and the reverse circulation drainage pump can be discharged twice, thereby reducing energy consumption;

[0028] 5. The present invention can be used for deep gas wells, such as wells greater than 3,500 meters, or even deep wells of 5,000-6,000 meters. It can also save the first-stage jet drainage pump and be used for drainage and production in medium and shallow wells, such as medium and shallow wells less than 3,500 meters. It can also be used for drainage and gas production in coalbed methane wells. It can be used in 2-7 / 8, 3-1 / 2 and 4-inch and above gas production pipes, and is more suitable for new wells that have not yet been put into the gas production pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the first structural principle of the present invention;

[0030] Figure 2 It is a structural schematic diagram of a first embodiment of a pressure-controlled switch jet suction pump;

[0031] Figure 3 is a schematic structural diagram of a second embodiment of a pressure-controlled switch jet suction pump;

[0032] Figure 4 It is a schematic diagram of the structure of a reverse circulation drainage pump;

[0033] Figure 5 It is another schematic diagram of the structural principle of the present invention;

[0034] Figure 6 yes Figure 5 The structural schematic diagram of the one-way pressure controlled bleeder in FIG.

[0035] In the figure above: casing 1, tubing 2, small diameter tubing 3, pressure-controlled switch jet suction pump 4, reverse circulation drainage pump 5, packer 6, check valve 7, gas-producing formation 8, one-way pressure-controlled bleeder 9;

[0036] Floating pump core 4.1, first leather cup 4.2, pump barrel 4.3, first nozzle 4.4, first throat 4.5, first spring 4.6, sliding sleeve 4.7, liquid inlet valve 4.8, mixed liquid outlet 4.9, first fishing head 4.10, liquid inlet channel 4.11, formation liquid inlet 4.12, diffusion chamber 4.13, annular spray column 4.1.1, annular throat column 4.1.2, second fishing head 4.1.3, support column 4.1.4, positioning column 4.1.5, first inlet 4.14, support step 4.3.1;

[0037] Pump body 5.1, second throat pipe 5.2, second nozzle 5.3, second power fluid inlet 5.4, second leather cup 5.5, liquid discharge port 5.6, liquid inlet 5.7;

[0038] The bleeder body 9.1, the inner sliding sleeve 9.2, the bleed hole 9.3, the second spring 9.4, the adjusting ring 9.5, the upper joint 9.6, and the lower joint 9.7. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0040] Example 1, reference Figure 1 , Figure 2 and Figure 4The present invention relates to a deep well gas production pipe column internal jet drainage device, comprising a casing 1, an oil pipe 2 and a reverse circulation drainage pump 5, wherein a pressure-controlled switch jet suction pump 4 and a reverse circulation drainage pump 5 are connected and lowered into the oil pipe 2 through a small-diameter oil pipe 3, the pressure-controlled switch jet suction pump 4 is located in the middle and upper part of the oil and gas well, the reverse circulation drainage pump 5 is located in the lower part of the oil and gas well, a packer 6 is installed below the reverse circulation drainage pump 5, and a check valve 7 is installed at the bottom; the pressure-controlled switch jet suction pump 4 comprises a floating pump core 4.1, a pump barrel 4.3, a first spring 4.6, sleeve 4.7, a floating pump core 4.1 is installed in the pump barrel 4.3, a first spring 4.6 and a sleeve 4.7 are arranged outside the pump barrel 4.3, and the switch control of the mixed liquid outlet 4.9 is realized by the sleeve 4.7; by injecting high-pressure gas into the small-diameter oil pipe 3, the water in the upper pipe string of the pressure-controlled switch jet suction pump 4 is discharged, and after the discharge, the sleeve 4.7 moves to close the mixed liquid outlet 4.9; and then by injecting high-pressure gas into the annulus between the casing 1 and the oil pipe 2, the water in the upper pipe string of the reverse circulation drainage pump 5 is discharged.

[0041] Reference Figure 2 The pressure-controlled switch jet suction pump 4 mentioned in the present invention also includes a first nozzle 4.4, a first throat 4.5, and a liquid inlet valve 4.8. The upper part of the inner wall of the pump barrel 4.3 is provided with a support step 4.3.1, which is matched and connected with the upper protrusion of the floating pump core 4.1. The upper outer diameter of the floating pump core 4.1 is larger than the lower outer diameter, so that the floating pump core 4.1 can float upward a little during backwashing, so that the backwashing flow channel becomes larger, reducing the resistance of the floating pump core 4.1, thereby accelerating the backwashing speed and reducing the pressure of the backwashing construction;

[0042] A first fishing head 4.10 is installed on the top of the floating pump core 4.1, a first inlet 4.14 is installed on the upper side of the floating pump core 4.1, a first nozzle 4.4 is provided at the lower part of the floating pump core 4.1, a first throat 4.5 is provided below the first nozzle 4.4, the lower part of the first throat 4.5 is connected to the diffusion chamber 4.13, the lower part of the diffusion chamber 4.13 is provided with a mixed liquid outlet 4.9, and a liquid inlet valve 4.8 is installed at the lower end of the pump barrel 4.3.

[0043] Reference Figure 4 The reverse circulation drainage pump 5 mentioned in the present invention includes a pump body 5.1, a second throat pipe 5.2, a second nozzle 5.3, and a second power liquid inlet 5.4. The second power liquid inlet 5.4 is provided on the lower side of the pump body 5.1, and the second power liquid inlet 5.4 is connected to the second nozzle 5.3 in the inner cavity of the pump body 5.1. A second throat pipe 5.2 is provided above the second nozzle 5.3. A discharge port 5.6 is provided on the top of the pump body 5.1, and a liquid inlet 5.7 is provided at the bottom of the pump body 5.1. A second leather cup 5.5 is installed on the outer side of the liquid inlet 5.7.

[0044] The method for using the jet drainage device in the deep well gas production pipe string mentioned in the present invention comprises the following process:

[0045] First, a pressure-controlled switch jet suction pump 4 and a reverse circulation drainage pump 5 are connected and lowered into the oil pipe 2 through a small-diameter oil pipe 3. The pressure-controlled switch jet suction pump 4 is located in the middle and upper part of the oil and gas well, and the reverse circulation drainage pump 5 is located in the lower part of the oil and gas well, and a packer 6 is set;

[0046] Second, the gas injection process at the wellhead and on the ground is adjusted to inject high-pressure gas into the small-diameter oil pipe 3. The high-pressure gas enters the floating pump core 4.1 of the pressure-controlled switch jet suction pump 4 along the first inlet 4.14, and then is ejected along the first nozzle 4.4, driving the liquid entering from the liquid inlet valve 4.8 to mix gas and liquid in the first throat 4.5, and then passes through the mixed liquid outlet 4.9 downward along the diffusion chamber 4.13 and is discharged to the annulus between the floating pump core 4.1 and the pump barrel 4.3. The sleeve 4.7 is opened, and then the mixed liquid outlet 4.9 on the outer wall of the pump barrel 4.3 is discharged to the annulus between the small-diameter oil pipe 3 and the oil pipe 2. The gas-liquid mixture is lifted upward to the ground until the annulus between the small-diameter oil pipe 3 and the oil pipe 2 is emptied, thereby realizing the emptying of the liquid on the upper part of the pressure-controlled switch jet suction pump 4; after emptying, the sleeve 4.7 moves under the action of the first spring 4.6 to close the mixed liquid outlet 4.9;

[0047] Third, high-pressure gas is injected into the annulus between the oil pipe 2 and the small-diameter oil pipe 3 through the surface gas injection process. The high-pressure gas continues to push the liquid in the annulus between the oil pipe 2 and the small-diameter oil pipe 3 below the pressure-controlled switch jet suction pump 4 to move downward, and enters the second nozzle 5.3 through the second power fluid inlet 5.4 of the reverse circulation drainage pump 5 at the deep well to spray out, driving the formation liquid at the liquid inlet 5.7 to mix, and upwardly discharge through the discharge port 5.6 along the second throat 5.2. The mixed liquid goes upward along the small-diameter oil pipe 3, passes through the liquid inlet valve 4.8 of the pressure-controlled switch jet suction pump 4, and enters the pump barrel 4.3. At this time, the sliding sleeve 4.7 is in a closed state, and the liquid mixture is discharged upwardly along the pump barrel 4.3 and the floating pump core 4.1 until it is discharged to the ground, completing the complete replacement of the liquid in the inner cavity of the oil pipe 2;

[0048] Fourth, the injection of high-pressure gas is stopped at this time. Since the liquid in the inner cavity of the oil pipe 2 is completely emptied, under the pressure of the gas-producing formation 8, the gas production opens the check valve 7 and is produced along the oil pipe 2 to the ground, resuming gas production in the deep well.

[0049] Example 2, reference Figure 3Another deep well gas production pipe string internal jet drainage device mentioned in the present invention, the floating pump core 4.1 includes a ring spray column 4.1.1, a ring throat column 4.1.2, a second fishing head 4.1.3, a support column 4.1.4, and a positioning column 4.1.5. The lower part of the second fishing head 4.1.3 is connected to the ring spray column 4.1.1, the lower part of the ring spray column 4.1.1 is connected to the support column 4.1.4 through the ring throat column 4.1.2, and the lower end of the support column 4.1.4 is provided with a positioning column 4.1.5; the outer diameter of the ring spray column 4.1.1 is greater than the outer diameter of the ring throat column 4.1.2, and the outer diameter of the support column 4.1.4 is greater than the outer diameter of the positioning column 4.1.5.

[0050] The above-mentioned annular spray column 4.1.1 and the inner wall of the pump barrel 4.3 form a first nozzle 4.4 of the annular spray structure, a first leather cup 4.2 is provided at the lower part of the second fishing head 4.1.3, the annular throat column 4.1.2 and the inner wall of the pump barrel 4.3 form a first throat pipe 4.5 of the annular spray structure, a diffusion chamber 4.13 is provided below the first throat pipe 4.5, a liquid inlet channel 4.11 is provided on one side of the inner wall of the pump barrel 4.3, the lower end of the liquid inlet channel 4.11 is connected to the formation fluid inlet 4.12, and the upper end is connected to the lower part of the first nozzle 4.4 of the annular spray structure, and the formation fluid is mixed with the power fluid from above, and then passes through the first throat pipe 4.5 and the diffusion chamber 4.13, and is discharged along the mixed liquid outlet 4.9 provided on the outer wall of the pump barrel 4.3.

[0051] Compared with the first embodiment, the present embodiment adopts a ring-spraying structure, which has a better sand prevention effect and prevents the sand from getting stuck in the first nozzle 4.4.

[0052] Example 3, reference Figure 5 Another deep well gas production pipe internal jet drainage device mentioned in the present invention has a technical solution of: a one-way pressure-controlled drain 9 is installed on the small-diameter oil pipe 3 between the pressure-controlled switch jet suction pump 4 and the reverse circulation drainage pump 5.

[0053] Reference Figure 6 The one-way pressure-controlled bleeder 9 mentioned in the present invention includes a bleeder body 9.1, an inner sleeve 9.2, a leakage hole 9.3, a second spring 9.4, an upper joint 9.6, and a lower joint 9.7. The upper end of the bleeder body 9.1 is provided with an upper joint 9.6, and the lower end is provided with a lower joint 9.7. The middle and upper part of the bleeder body 9.1 is provided with a leakage hole 9.3, and the inner sleeve 9.2 and the second spring 9.4 are provided in the inner cavity of the bleeder body 9.1. The lower end of the inner sleeve 9.2 is connected to the second spring 9.4, and the lower part of the inner sleeve 9.2 is provided with a boss structure.

[0054] The inner diameter of the upper part of the inner wall of the above-mentioned bleeder body 9.1 is smaller than the inner diameter of the lower part. An adjustment ring 9.5 is provided at the lower part of the inner wall of the bleeder body 9.1, and the upper part of the adjustment ring 9.5 is connected to the lower end of the second spring 9.4.

[0055] Another method for using a jet drainage device in a deep well gas production pipe string mentioned in the present invention comprises the following steps:

[0056] First, a pressure-controlled switch jet suction pump 4 and a reverse circulation drainage pump 5 are connected and lowered into the oil pipe 2 through a small-diameter oil pipe 3. The pressure-controlled switch jet suction pump 4 is located in the middle and upper part of the oil and gas well, and the reverse circulation drainage pump 5 is located in the lower part of the oil and gas well, and a packer 6 is set;

[0057] Second, the gas injection process at the wellhead and on the ground is adjusted to inject high-pressure gas into the small-diameter oil pipe 3. The high-pressure gas enters the floating pump core 4.1 of the pressure-controlled switch jet suction pump 4 along the first inlet 4.14, and then is ejected along the first nozzle 4.4, driving the liquid entering from the liquid inlet valve 4.8 to mix gas and liquid in the first throat 4.5, and then passes through the mixed liquid outlet 4.9 downward along the diffusion chamber 4.13 and is discharged to the annulus between the floating pump core 4.1 and the pump barrel 4.3. The sleeve 4.7 is opened, and then the mixed liquid outlet 4.9 on the outer wall of the pump barrel 4.3 is discharged to the annulus between the small-diameter oil pipe 3 and the oil pipe 2. The gas-liquid mixture is lifted upward to the ground until the annulus between the small-diameter oil pipe 3 and the oil pipe 2 is emptied, thereby realizing the emptying of the liquid on the upper part of the pressure-controlled switch jet suction pump 4; after emptying, the sleeve 4.7 moves under the action of the first spring 4.6 to close the mixed liquid outlet 4.9;

[0058] Third, high-pressure gas is injected into the annulus between the oil pipe 2 and the small-diameter oil pipe 3 through the ground gas injection process. The high-pressure gas continues to push the liquid in the annulus between the oil pipe 2 and the small-diameter oil pipe 3 below the pressure-controlled switch jet suction pump 4 to move downward, and enters through the leakage hole 9.3 of the one-way pressure-controlled bleeder 9, and pushes the inner sleeve 9.2 to open. The high-pressure gas pushes the liquid in the inner cavity of the small-diameter oil pipe 3 above the one-way pressure-controlled bleeder 9 to be discharged upward, and enters the pump barrel 4.3 through the liquid inlet valve 4.8 of the pressure-controlled switch jet suction pump 4. At this time, the sleeve 4.7 is in a closed state, and the liquid mixture is discharged upward along the pump barrel 4.3 and the floating pump core 4.1 until it is discharged to the ground, completing the replacement of the liquid in the inner cavity of the oil pipe 2 and the small-diameter oil pipe 3 above the one-way pressure-controlled bleeder 9;

[0059] Fourth, high-pressure gas is injected into the annulus between the oil pipe 2 and the small-diameter oil pipe 3 through the surface gas injection process. The high-pressure gas continues to push the liquid in the annulus between the oil pipe 2 and the small-diameter oil pipe 3 located below the pressure-controlled switch jet suction pump 4 to move downward, and enters the second nozzle 5.3 through the second power fluid inlet 5.4 of the reverse circulation drainage pump 5 at the deep well to be sprayed, driving the formation liquid at the liquid inlet 5.7 to mix, and then discharge upward along the second throat 5.2 through the discharge port 5.6, and the mixed liquid flows along the small-diameter oil pipe 3. Upward, through the lower joint 9.7 of the one-way pressure-controlled bleeder 9, at this time the inner sleeve 9.2 is in a closed state, the liquid mixture is discharged upward along the inner cavity of the bleeder body 9.1, and then continues upward along the small-diameter oil pipe 3, passes through the liquid inlet valve 4.8 of the pressure-controlled switch jet suction pump 4 and enters the pump barrel 4.3. At this time, the sleeve 4.7 is in a closed state, and the liquid mixture is discharged upward along the pump barrel 4.3 and the floating pump core 4.1 until it is discharged to the ground, completing the complete replacement of the liquid in the inner cavity of the oil pipe 2;

[0060] Fifth, the injection of high-pressure gas is stopped at this time. Since the liquid in the inner cavity of the oil pipe 2 is completely emptied, under the pressure of the gas-producing formation 8, the gas production opens the check valve 7 and is produced along the oil pipe 2 to the ground, resuming gas production in the deep well.

[0061] The above are only some preferred embodiments of the present invention. Any person skilled in the art may modify the above technical solutions or modify them into equivalent technical solutions. Therefore, the corresponding simple modifications or equivalent transformations made according to the technical solutions of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method for using a jet drainage device in a deep well gas production string, the jet drainage device in a deep well gas production string comprising a casing (1), an oil pipe (2) and a reverse circulation drainage pump (5), wherein: A pressure-controlled switch jet suction pump (4) and a reverse circulation drainage pump (5) are connected and lowered into the oil pipe (2) through a small-diameter oil pipe (3); the pressure-controlled switch jet suction pump (4) is located in the middle and upper part of the oil and gas well, and the reverse circulation drainage pump (5) is located in the lower part of the oil and gas well. A packer (6) is installed below the reverse circulation drainage pump (5), and a check valve (7) is installed at the bottom. The pressure-controlled switch jet suction pump (4) comprises a floating pump core (4.1), a pump barrel (4.3), a first spring (4.6), and a sliding sleeve (4.7). A floating pump (4.1) is installed in the pump barrel (4.3). A pump core (4.1) is provided with a first spring (4.6) and a sliding sleeve (4.7) on the outside of the pump barrel (4.3), and the sliding sleeve (4.7) is used to realize the switch control of the mixed liquid outlet (4.9); by injecting high-pressure gas into the small-diameter oil pipe (3), the water in the upper pipe column of the pressure-controlled switch jet suction pump (4) is discharged, and after the water is discharged, the sliding sleeve (4.7) moves to close the mixed liquid outlet (4.9); and then by injecting high-pressure gas into the annulus between the oil pipe (2) and the small-diameter oil pipe (3), the water in the upper pipe column of the reverse circulation drainage pump (5) is discharged; The pressure-controlled switch jet suction pump (4) further comprises a first nozzle (4.4), a first throat (4.5), and a liquid inlet valve (4.8); a support step (4.3.1) is provided on the upper inner wall of the pump barrel (4.3) and is connected with the upper protrusion of the floating pump core (4.1); a first fishing head (4.10) is installed on the top of the floating pump core (4.1); a first inlet (4.14) is installed on the upper side of the floating pump core (4.1); a first nozzle (4.4) is provided on the lower part of the floating pump core (4.1); a first throat (4.5) is provided below the first nozzle (4.4); the lower part of the first throat (4.5) is connected to the diffusion chamber (4.13); the lower part of the diffusion chamber (4.13) is provided with a mixed liquid outlet (4.9); and the liquid inlet valve (4.8) is installed at the lower end of the pump barrel (4.3); The reverse circulation drainage pump (5) comprises a pump body (5.1), a second throat pipe (5.2), a second nozzle (5.3), and a second power fluid inlet (5.4); the second power fluid inlet (5.4) is provided on the lower side of the pump body (5.1); the second power fluid inlet (5.4) is connected to the second nozzle (5.3) in the inner cavity of the pump body (5.1); a second throat pipe (5.2) is provided above the second nozzle (5.3); a liquid discharge port (5.6) is provided on the top of the pump body (5.1); the bottom of the pump body (5.1) is a liquid inlet (5.7); and a second leather cup (5.5) is installed on the outer side of the liquid inlet (5.7); A one-way pressure-controlled bleeder (9) is installed on the small-diameter oil pipe (3) between the pressure-controlled switch jet suction pump (4) and the reverse circulation drainage pump (5); The one-way pressure-controlled bleeder (9) comprises a bleeder body (9.1), an inner sleeve (9.2), a leakage hole (9.3), a second spring (9.4), an upper joint (9.6), and a lower joint (9.7); the upper end of the bleeder body (9.1) is provided with an upper joint (9.6), the lower end is provided with a lower joint (9.7), the middle and upper part of the bleeder body (9.1) is provided with a leakage hole (9.3), the inner sleeve (9.2) and the second spring (9.4) are provided in the inner cavity of the bleeder body (9.1), the lower end of the inner sleeve (9.2) is connected to the second spring (9.4), and the lower part of the inner sleeve (9.2) is provided with a boss structure; The method for using the jet drainage device in the deep well gas production string includes the following process: First, a pressure-controlled switch jet suction pump (4) and a reverse circulation drainage pump (5) are connected and lowered into the oil pipe (2) through a small-diameter oil pipe (3), the pressure-controlled switch jet suction pump (4) is located in the middle and upper part of the oil and gas well, the reverse circulation drainage pump (5) is located in the lower part of the oil and gas well, and a packer (6) is set; Second, the gas injection process at the wellhead and on the ground is adjusted to inject high-pressure gas into the small-diameter oil pipe (3). The high-pressure gas enters the floating pump core (4.1) of the pressure-controlled switch jet suction pump (4) along the first inlet (4.14), and then is ejected along the first nozzle (4.4), driving the liquid entering from the liquid inlet valve (4.8) to mix with the gas and liquid in the first throat (4.5), and then flows downward along the diffusion chamber (4.13) through the mixed liquid outlet (4.9) and is discharged to the floating pump core (4.1) and the pump barrel (4.4). .3), the sleeve (4.7) is opened, and then the mixed liquid outlet (4.9) on the outer wall of the pump barrel (4.3) is discharged into the annular space between the small-diameter oil pipe (3) and the oil pipe (2), and the gas-liquid mixture is lifted upward to the ground until the annular space between the small-diameter oil pipe (3) and the oil pipe (2) is emptied, thereby realizing the emptying of the liquid on the upper part of the pressure-controlled switch jet suction pump (4); after the emptying, the sleeve (4.7) moves under the action of the first spring (4.6) to close the mixed liquid outlet (4.9); Third, high-pressure gas is injected into the annulus between the oil pipe (2) and the small-diameter oil pipe (3) through the surface gas injection process. The high-pressure gas continues to push the liquid in the annulus between the oil pipe (2) and the small-diameter oil pipe (3) below the pressure-controlled switch jet suction pump (4) to move downward, and enters through the leakage hole (9.3) of the one-way pressure-controlled bleeder (9), and pushes the inner sleeve (9.2) to open. The high-pressure gas pushes the liquid in the inner cavity of the small-diameter oil pipe (3) above the one-way pressure-controlled bleeder (9) to be discharged upward, and enters the pump barrel (4.3) through the liquid inlet valve (4.8) of the pressure-controlled switch jet suction pump (4). At this time, the sleeve (4.7) is in a closed state, and the liquid mixture is discharged upward along the pump barrel (4.3) and the floating pump core (4.1) until it is discharged to the ground, completing the replacement of the liquid in the inner cavity of the oil pipe (2) and the small-diameter oil pipe (3) above the one-way pressure-controlled bleeder (9); Fourth, high-pressure gas is injected into the annulus between the oil pipe (2) and the small-diameter oil pipe (3) through the surface gas injection process. The high-pressure gas continues to push the liquid in the annulus between the oil pipe (2) and the small-diameter oil pipe (3) located below the pressure-controlled switch jet suction pump (4) to move downward, and enters the second nozzle (5.3) through the second power fluid inlet (5.4) of the reverse circulation drainage pump (5) at the deep well to be sprayed out, driving the formation liquid at the liquid inlet (5.7) to mix, and then discharge upward along the second throat (5.2) through the discharge port (5.6). The mixed liquid flows along the small-diameter oil pipe (3) Upward, through the lower joint (9.7) of the one-way pressure-controlled bleeder (9), at which time the inner sleeve (9.2) is in a closed state, and the liquid mixture is discharged upward along the inner cavity of the bleeder body (9.1), and then continues to flow upward along the small-diameter oil pipe (3), passes through the liquid inlet valve (4.8) of the pressure-controlled switch jet suction pump (4) and enters the pump barrel (4.3). At this time, the sleeve (4.7) is in a closed state, and the liquid mixture is discharged upward along the pump barrel (4.3) and the floating pump core (4.1) until it is discharged to the ground, completing the complete replacement of the liquid in the inner cavity of the oil pipe (2); Fifth, the injection of high-pressure gas is stopped at this time. Since the liquid in the inner cavity of the oil pipe (2) is completely drained, the gas is pushed open by the pressure of the gas-producing formation (8) to open the check valve (7) and flow out along the oil pipe (2) to the ground, thereby resuming gas production in the deep well.

2. The method for using the jet drainage device in the deep well gas production pipe string according to claim 1 is characterized by: The inner diameter of the upper part of the inner wall of the bleeder body (9.1) is smaller than the inner diameter of the lower part. An adjustment ring (9.5) is provided at the lower part of the inner wall of the bleeder body (9.1). The upper part of the adjustment ring (9.5) is connected to the lower end of the second spring (9.4).

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