Integrated oil-gas stratified injection-production technology string and its injection-production method

Abstract

The present application discloses an integrated process string for oil and gas stratified injection and production and an injection and production method thereof. The first sealing packer and the second sealing packer are fixed on the inner side of the casing and seal the casing. Close the first through hole and conduct the primary production of the oil layer. The oil in the oil layer sprays out from the pipe string by using its own energy. After a certain amount of oil is sprayed out, lower the plug into the landing nipple to seal the pipe string. At the same time, open the first through hole and inject natural gas into the pipe string. The natural gas enters the gas layer from the first through hole and through the first gas injection port to realize the storage of natural gas in the gas layer. When the energy of the oil layer is stored to a certain extent, make the oil spray out from the pipe string, and finally realize the production of the oil in the oil layer. Then inject gas into the upper gas layer and the lower oil layer simultaneously. Through the setting of this process string, the injection of natural gas into the upper gas layer can be effectively improved by using the time period of storing the energy of the lower oil layer.

Description

Technical Field

[0001] This application belongs to the technical field of oil and gas injection and production string, and particularly relates to an integrated process string for oil and gas layered injection and production and an injection and production method thereof. Background Art

[0002] A gas storage reservoir is an artificial gas field or gas reservoir formed by re-injecting commercial natural gas into underground spaces. It is constructed using depleted gas or oil layers and is the most common and economical form of underground gas storage, featuring low construction cost and reliable operation.

[0003] However, in actual production work, when injecting gas into an underground space with a gas layer on the upper layer and an oil layer on the lower layer, there is usually a situation where the lower oil layer has not been depleted. Therefore, before injecting natural gas, it is necessary to extract the oil layer at the bottom. After the extraction of the bottom oil layer is completed, natural gas is then injected into the oil layer for storage. Since the extraction process of the oil layer requires a large amount of time, it will inevitably affect the injection efficiency of natural gas. Summary of the Invention

[0004] This application aims to at least solve to some extent the technical problem of low injection efficiency of the existing string when injecting gas into an underground space with a gas layer on the upper layer and an oil layer on the lower layer. For this purpose, this application provides an integrated process string for oil and gas layered injection and production and an injection and production method thereof.

[0005] An integrated process string for oil and gas layered injection and production provided by an embodiment of this application, the process string includes:

[0006] A casing, on the surface of which a first gas injection port and a second gas injection port are provided;

[0007] A string, which is inserted into the interior of the casing. The string is sequentially provided with a first sealing packer, a second sealing packer, and a landing nipple from top to bottom. The first sealing packer is located above the first gas injection port, the second sealing packer is located between the first gas injection port and the second gas injection port, the landing nipple is used for installing a plug in the string, and a first through hole is provided on the surface of the string, and the first through hole is located between the first sealing packer and the second sealing packer.

[0008] In some embodiments, both the first sealing packer and the second sealing packer include:

[0009] A fixed cylinder, the two ends of which are fixed to the string;

[0010] A rubber cylinder, which is sleeved on the surface of the fixed cylinder and fits with the inner side surface of the casing;

[0011] The first extrusion cylinder, the first extrusion cylinder is sleeved on the surface of the fixed cylinder and axially extrudes the rubber cylinder;

[0012] The first clamping cylinder, the first clamping cylinder is located on one side of the first extrusion cylinder, and the outer side surface of the first clamping cylinder is clamped with the inner side surface of the casing.

[0013] In some embodiments, the first sealing packer and the second sealing packer further include a hydraulic piston. The hydraulic piston includes:

[0014] An abutting member, the abutting member is sleeved on the surface of the fixed cylinder and is located on one side of the first extrusion cylinder. A first expansion inclined surface is provided at one end of the first extrusion cylinder away from the rubber cylinder. One end of the first clamping cylinder is located on the first expansion inclined surface, and the other end of the first clamping cylinder abuts against the abutting member;

[0015] A first fixing member, a first hydraulic port is provided on the surface of the fixed cylinder, and the first fixing member is sleeved on the surface of the fixed cylinder and fixed on the side of the first hydraulic port away from the first clamping cylinder;

[0016] A first driving cylinder, the first driving cylinder is sleeved on the surface of the fixed cylinder and is located on the side of the first hydraulic port close to the first clamping cylinder;

[0017] A sealing member, the sealing member is fixed on the outer side surface of the first driving cylinder and extends towards the first fixing member, and the inner side surface of the sealing member is in sealing fit with the sealing member and the first fixing member.

[0018] In some embodiments, the hydraulic piston further includes:

[0019] A second driving cylinder, a second hydraulic port is provided on the surface of the fixed cylinder, the second hydraulic port is located between the first hydraulic port and the abutting member, the second driving cylinder is sleeved on the surface of the fixed cylinder and is located on the side of the second hydraulic port close to the first clamping cylinder, and the second driving cylinder is fixedly connected with the first driving cylinder;

[0020] A second fixing member, the second fixing member is fixed on the surface of the fixed cylinder and is located on the side of the second hydraulic port away from the first clamping cylinder, and the outer side surface of the second fixing member is in sealing fit with the inner side surface of the first driving cylinder.

[0021] In some embodiments, ratchet teeth are provided on the outer side surface of the fixed cylinder, and both the first extrusion cylinder and the abutting member are clamped with the fixed cylinder through the ratchet teeth.

[0022] In some embodiments, the first sealing packer and the second sealing packer further include:

[0023] A second extrusion cylinder, which is sleeved on the surface of the fixed cylinder and abuts against the other end of the rubber cylinder. The second extrusion cylinder; a second expansion inclined surface is provided at one end of the second extrusion cylinder away from the rubber cylinder.

[0024] A second clamping cylinder, one end of which is located on the second expansion inclined surface, and the other end of the first clamping cylinder abuts against the surface of the fixed cylinder.

[0025] In some embodiments, the first sealing packer and the second sealing packer further include:

[0026] Two expansion spacer rings, both of which are sleeved on the surface of the fixed cylinder. One of the expansion spacer rings is located between the first extrusion cylinder and the rubber cylinder, and the other expansion spacer ring is located between the second extrusion cylinder and the rubber cylinder.

[0027] In some embodiments, the first sealing packer and the second sealing packer further include:

[0028] A sealing short pipe, the lower end of which is sleeved on the upper end of the fixed cylinder and is threadedly connected to the fixed cylinder;

[0029] An inserted sealing pipe, the lower end of which is inserted into the interior of the sealing short pipe from the upper end of the sealing short pipe and is threadedly connected to the sealing short pipe.

[0030] In some embodiments, the pipe string further includes a first circulation sliding sleeve, and the first circulation sliding sleeve includes:

[0031] An outer sleeve, both ends of which are respectively fixed on the pipe string. A stroke groove is provided inside the outer sleeve, and the first through hole is provided on the surface of the outer sleeve and communicates with the stroke groove;

[0032] An inner sliding cylinder, which is slidably connected in the stroke groove and is hermetically fitted with the inner wall of the stroke groove. An air inlet through groove is provided on the surface of the inner sliding cylinder, and the air inlet through groove communicates with the first through hole as the inner sliding cylinder slides.

[0033] In some embodiments, the pipe string further includes a second circulation sliding sleeve having the same structure as the first circulation sliding sleeve. The second circulation sliding sleeve is fixed on one side of the first sealing packer away from the first circulation sliding sleeve through the outer sleeve, and a second through hole is provided on the surface of the second circulation sliding sleeve.

[0034] In some embodiments, the installation direction of the second circulation sliding sleeve is opposite to that of the first circulation sliding sleeve, and the air inlet through groove deviates from the center of the inner sliding cylinder.

[0035] In some embodiments, a first hook groove and a second hook groove symmetrically arranged with respect to the first hook groove are provided on the inner side surface of the inner sliding cylinder. The first hook groove and the second hook groove are respectively located on both sides of the air inlet through groove. The side walls of the first hook groove and the second hook groove close to the end of the inner sliding cylinder are perpendicular to the bottom wall of the first hook groove. The other side walls of the first hook groove and the second hook groove are inclined in a direction away from the end of the inner sliding cylinder.

[0036] In some embodiments, pressing inclined surfaces extending in a direction away from the travel groove are provided on both side walls of the travel groove.

[0037] In some embodiments, an annular groove is provided on the inner wall of the travel groove. The annular groove is located on one side of the first through hole and communicates with the first through hole. The air inlet through groove communicates with the annular groove as the inner sliding cylinder slides.

[0038] In some embodiments, a sealing ring is provided between the outer sleeve and the inner sliding cylinder. The sealing ring is located on both sides of the annular groove.

[0039] In some embodiments, a locking protrusion is provided on the outer side surface of the inner sliding cylinder, and a locking groove adapted to the locking protrusion is provided on the inner side surface of the outer sleeve. When the air inlet through groove and the first through hole communicate, the locking protrusion is clamped in the locking groove.

[0040] The embodiments of the present application have at least the following beneficial effects:

[0041] During operation, first, the casing is lowered into the underground space to a certain depth so that the first gas injection port is aligned with the upper gas layer and the second gas injection port is aligned with the lower oil layer. Then, the pipe string is inserted into the inside of the casing, and the first sealing packer is located above the first gas injection port, and the second sealing packer is located above the second gas injection port. At the same time, a ball is dropped and pressured and liquid is injected to make the first sealing packer and the second sealing packer firmly fixed on the inner side surface of the casing and seal the casing. After injecting a protective liquid between the casing above the first sealing packer and the pipe string, the first through hole is closed, and the first exploitation of the oil layer is carried out. The oil in the oil layer will enter the casing from the second gas injection port, enter the pipe string from the lower opening of the pipe string, and spray out from the pipe string by its own energy. When a certain amount of oil is sprayed out, due to the reduction of its own energy, it will not be able to spray out from the pipe string.

[0042] At this time, lower the plug into the landing nipple to seal the tubing string, so that the oil body cannot pass through the plug, to store the energy of the oil reservoir. While storing energy in the oil reservoir, open the first through-hole and inject natural gas into the tubing string. The natural gas will enter the gas reservoir from the first through-hole and through the first gas injection port, realizing the storage of natural gas in the gas reservoir. When the energy of the oil reservoir is stored to a certain extent, seal the first through-hole and remove the plug, so that the oil body sprays out from the tubing string; when the oil body cannot spray out from the tubing string due to insufficient energy, lower the plug into the landing nipple again and repeat the above actions until the energy of the oil reservoir is exhausted and the oil body cannot spray out from the tubing string; repeat the above actions until the last time the plug is removed and the oil body cannot spray out from the tubing string, finally realizing the exploitation of the oil body in the oil reservoir; then open the first through-hole and inject gas into the upper gas reservoir and the lower oil reservoir simultaneously. Through the setting of this process tubing string, the injection of gas into the upper gas reservoir can be carried out during the period of storing the energy of the lower oil reservoir, effectively saving the time used in the gas injection process and improving the gas injection efficiency of natural gas.

[0043] A method for injecting and producing oil and gas in a stratified integrated process tubing string provided by an embodiment of the present application includes the following steps:

[0044] S100: Lower the process tubing string to a certain depth in the underground space so that the first gas injection port is aligned with the upper gas reservoir and the second gas injection port is aligned with the lower oil reservoir;

[0045] S200: Inject a ball into the tubing string and apply pressure to make the first sealing packer and the second sealing packer firmly on the inner side of the casing and seal the casing;

[0046] S300: Use the energy of the oil reservoir itself to make the oil body spray out from the tubing string until the energy of the oil reservoir is exhausted and the oil body cannot spray out from the tubing string;

[0047] S400: Lower the plug to the landing nipple to seal the tubing string and store the energy of the oil reservoir;

[0048] S500: Open the first through-hole and inject natural gas into the tubing string to make the natural gas enter the gas reservoir;

[0049] S600: After a period of time, close the first through-hole and remove the plug, so that the oil reservoir uses the stored energy to make the oil body spray out from the tubing string until the energy of the oil reservoir is exhausted and the oil body cannot spray out from the tubing string;

[0050] S700: Repeat the steps S400 to S600 several times; until the last time the plug is removed and the oil body cannot spray out from the tubing string;

[0051] S800: Open the first through-hole and inject gas into the upper gas reservoir and the lower oil reservoir simultaneously.

[0052] The embodiments of the present application at least have the following beneficial effects:

[0053] Through the injection-production method of the process string, the gas injection into the upper gas layer can be carried out during the period of storing the energy of the lower oil layer, effectively saving the time used in the gas injection process and improving the gas injection efficiency of natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0055] Figure 1 Shows the structural schematic diagram of the integrated oil-gas layered injection-production process string in the embodiments of the present application;

[0056] Figure 2 Shows the structural schematic diagram of the first sealing packer or the second sealing packer of the integrated oil-gas layered injection-production process string in the embodiments of the present application;

[0057] Figure 3 Shows Figure 2 The partial enlarged view of A in

[0058] Figure 4 Shows Figure 2 The partial enlarged view of B in

[0059] Figure 5 Shows Figure 2 The partial enlarged view of C in

[0060] Figure 6 Shows Figure 2 The partial enlarged view of D in

[0061] Figure 7 Shows Figure 2 The partial enlarged view of E in

[0062] Figure 8 Shows the structural schematic diagram of the first circulation sliding sleeve of the integrated oil-gas layered injection-production process string in the embodiments of the present application;

[0063] Figure 9 Shows the structural schematic diagram of the driving tool inserted into the first circulation sliding sleeve in the embodiments of the present application;

[0064] Figure 10 Shows Figure 9 The partial enlarged view of A in

[0065] Figure 11 ShowsFigure 9 Partial enlarged view at B in the middle;

[0066] Figure 12 The flowchart shows the injection and production method of the integrated oil and gas stratified injection and production process string in the embodiment of the present application.

[0067] Reference numerals:

[0068] 10—Casing 11—First gas injection port 12—Second gas injection port

[0069] 20—String 21—First sealing packer 22—Second sealing packer

[0070] 23—Landing nipple 24—First circulation sliding sleeve 25—Second circulation sliding sleeve

[0071] 26—Soluble ball seat 27—Ball 28—Milling extension barrel

[0072] 211—Fixed barrel 212—Rubber barrel 213—First extrusion barrel

[0073] 214—First clamping barrel 215—Hydraulic piston 216—Abutting member

[0074] 217—First fixing member 218—First driving barrel 219—Sealing member

[0075] 221—Second driving barrel 222—Second fixing member 223—Second extrusion barrel

[0076] 224—Second clamping barrel 225—Expansion spacer ring 226—Inserted sealing tube

[0077] 227—Sealing nipple 241—First through hole 242—Outer sleeve

[0078] 243—Inner sliding barrel 244—Sealing ring 245—Driving tool

[0079] 2111—First hydraulic port 2112—Second hydraulic port 2113—Hydraulic cavity

[0080] 2114—Ratchet teeth 2131—Expansion inclined plane 2132—Breakable pin

[0081] 2421—Stroke groove 2422—Circular groove 2423—Locking groove

[0082] 2424—Pressing inclined plane 2431—Air inlet through groove 2432—First hook groove

[0083] 2433—Second hook groove 2434—Locking protrusion 2451—Tool body

[0084] 2452 - Elastic member 2453 - Adaptation cylinder 2454 - Clamping protrusion

[0085] 2455 - Unlock ramp 2511 - Second through hole. Specific embodiments

[0086] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0087] In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0088] The following describes the present application with reference to the accompanying drawings and specific embodiments:

[0089] In an embodiment provided by the present application, as Figure 1 shown, an integrated oil - gas stratified injection - production process string is provided, including:

[0090] Casing 10, on the surface of the casing 10, a first gas injection port 11 and a second gas injection port 12 are provided;

[0091] Pipe string 20, the pipe string 20 is inserted into the inside of the casing 10. The pipe string 20 is sequentially provided with a first sealing packer 21, a second sealing packer 22, and a setting nipple 23 from top to bottom. The first sealing packer 21 is located above the first gas injection port 11, the second sealing packer 22 is located between the first gas injection port 11 and the second gas injection port 12, and the setting nipple 23 is used for the plug to be installed in the pipe string 20. A first through - hole 241 is provided on the surface of the pipe string 20, and the first through - hole 241 is located between the first sealing packer 21 and the second sealing packer 22.

[0092] Specifically, during operation, first, the casing 10 is lowered to a certain depth in the underground space so that the first gas injection port 11 is aligned with the upper gas layer and the second gas injection port 12 is aligned with the lower oil layer. Then, the pipe string 20 is inserted into the interior of the casing 10, and the first sealing packer 21 is located above the first gas injection port 11, and the second sealing packer 22 is located above the second gas injection port 12. The first through hole 241 is closed. Then, a ball is dropped and pressured inside the pipe string 20 to seal the lower opening of the pipe string 20. Then, a liquid is injected into the pipe string 20. The first sealing packer 21 and the second sealing packer 22 will seat on the casing 10 under high-intensity hydraulic pressure and seal the casing 10. After the first sealing packer 21 and the second sealing packer 22 seal off the casing 10, the liquid injection into the pipe string 20 continues to be pressurized to knock off the ball, so that the liquid inside the pipe string 20 flows out from the lower opening of the pipe string 20, finally achieving the fixation and sealing between the first sealing packer 21 and the second sealing packer 22 and the casing 10.

[0093] Then, a protective liquid is injected between the pipe string 20 and the casing 10 to fill the gap between the casing 10 above the first sealing packer 21 and the pipe string 20, so as to give a certain hydraulic pressure to the pipe string 20 through the first sealing packer 21 to protect the pipe string 20 during the process of oil layer exploitation. At the same time, due to the relatively high air pressure between the first sealing packer 21 and the second sealing packer 22, part of the gas will overflow from the first sealing packer 21. The setting of the protective liquid can effectively prevent the gas from corroding the casing 10 and the pipe string 20.

[0094] Then, the primary exploitation of the oil layer is carried out. The oil in the oil layer will enter the casing 10 from the second gas injection port 12 and enter the pipe string 20 from the lower opening of the pipe string 20, and spray out from the pipe string 20 by its own energy. When a certain amount of oil has been sprayed out, due to the reduction of its own energy, it will no longer be able to spray out from the pipe string 20.

[0095] At this time, the plug is lowered to the landing nipple 23 for installation to seal the pipe string 20, so that the oil cannot pass through the plug, in order to store the energy of the oil layer. While the energy of the oil layer is being stored, the first through hole 241 is opened, and natural gas is injected into the pipe string 20. The natural gas will enter the gas layer from the first through hole 241 and through the first gas injection port 11, realizing the storage of natural gas in the gas layer. When the energy of the oil layer is stored to a certain extent, the first through hole 241 is sealed, and the plug is removed, so that the oil sprays out from the pipe string 20; when the oil cannot spray out from the pipe string due to insufficient energy, the plug is lowered to the landing nipple 23 again and the above operations are repeated until the energy of the oil layer is exhausted and the oil cannot spray out from the pipe string; the above operations are repeated until the last time the plug is removed and the oil cannot spray out from the pipe string, finally achieving the exploitation of the oil layer. Then, the first through hole 241 is opened, and gas is injected into the upper gas layer and the lower oil layer simultaneously.

[0096] By setting up this process string, during the period when the energy of the lower oil layer is stored, gas injection into the upper gas layer can be carried out, effectively saving the time used in the gas injection process and improving the gas injection efficiency of natural gas.

[0097] In this factual example, further, as Figure 1 shown, a soluble ball seat 26 is provided at one end of the string 20 close to the second gas injection port 12. When a ball is thrown and pressured, the sphere 27 falls into the soluble ball seat 26 to block the lower end of the string 20. After filling the protective liquid for a period of time, the protective liquid is pressured to make the sphere fall from the lower opening of the string 20.

[0098] In another embodiment provided by this application, as Figure 2 and 4 shown in FIG. -5, both the first sealing packer 21 and the second sealing packer 22 include:

[0099] A fixed cylinder 211, and both ends of the fixed cylinder 211 are fixed on the string 20;

[0100] A rubber cylinder 212, and the rubber cylinder 212 is sleeved on the surface of the fixed cylinder 211 and fits with the inner side surface of the casing 10;

[0101] A first extrusion cylinder 213, and the first extrusion cylinder 213 is sleeved on the surface of the fixed cylinder 211 and abuts against one end of the rubber cylinder 212;

[0102] A first clamping cylinder 214, the first clamping cylinder 214 is located on one side of the first extrusion cylinder 213 and abuts against the end of the hydraulic piston 215, and the outer side surface of the first clamping cylinder 214 is clamped with the inner side surface of the casing 10.

[0103] Specifically, both the first sealing packer 21 and the second sealing packer 22 are fixed on the string 20 through the fixed cylinder 211. The rubber cylinder 212 is sleeved on the surface of the fixed cylinder 211. The outer diameter of the rubber cylinder 212 increases under the axial extrusion of the first extrusion cylinder 213 and finally fits with the inner side surface of the casing 10, realizing the sealing connection between the first sealing packer 21 and the second sealing packer 22 and the casing 10. The first clamping cylinder 214 is clamped with the inner side surface of the casing 10 to realize the fixation of the first sealing packer 21 and the second sealing packer 22 on the inner side surface of the casing 10, and finally realize the fixation of the string 20 inside the casing 10.

[0104] In another embodiment provided by this application, as Figure 2 and 5 shown in FIG. -7, both the first sealing packer 21 and the second sealing packer 22 include a hydraulic piston 215, and the hydraulic piston 215 includes:

[0105] The abutting member 216 is sleeved on the surface of the fixed cylinder 211 and is located on one side of the first extrusion cylinder 213. A first expansion inclined surface 2131 is provided at one end of the first extrusion cylinder 213 away from the rubber cylinder 212. One end of the first clamping cylinder 214 is located on the first expansion inclined surface 2131, and the other end of the first clamping cylinder 214 abuts against the abutting member 216;

[0106] The first fixing member 217. A first hydraulic port 2111 is formed on the surface of the fixed cylinder 211. The first fixing member 217 is sleeved on the surface of the fixed cylinder 211 and is fixed on the side of the first hydraulic port 2111 away from the first clamping cylinder 214;

[0107] The first driving cylinder 218 is sleeved on the surface of the fixed cylinder 211 and is located on the side of the first hydraulic port 2111 close to the first clamping cylinder 214;

[0108] The sealing member 219 is fixed on the outer side surface of the driving cylinder and extends towards the first fixing member 217, and the inner side surface of the sealing member 219 is in sealing fit with the sealing member 219 and the first fixing member 217.

[0109] Specifically, when the pipe string 20 is just inserted into the casing 10, the rubber cylinder 212 and the first clamping cylinder 214 are not in contact with the inner side surface of the casing 10. After sealing the lower end of the pipe string 20 by initial ball throwing and pressure application, liquid is introduced into the pipe string 20. The liquid gradually rises in the pipe string 20 and enters the first hydraulic port 2111. Since the first sealing member 219 is located on the side of the first hydraulic port 2111 away from the first clamping cylinder 214, and the first driving cylinder 218 is located on the side of the first hydraulic port 2111 close to the first clamping cylinder 214, the first sealing member 219 and the first driving cylinder 218 are located on both sides of the first hydraulic port 2111, and the inner side surface of the sealing member 219 is in sealing fit with the sealing member 219 and the first fixing member 217, so that the sealing member 219, the first fixing member 217 and the first driving cylinder 218 enclose to form a hydraulic cavity 2113, and the liquid enters the hydraulic cavity 2113 from the first hydraulic port 2111.

[0110] Since the first fixing member 217 is fixed to the surface of the fixing cylinder 211, as the hydraulic pressure in the hydraulic chamber 2113 increases, a driving force acting on the first driving cylinder 218 will be generated, pushing the first driving cylinder 218 to move in the direction of the abutting member 216, driving the abutting member 216 to move. When the clamping cylinder moves, it will push the extrusion cylinder to extrude the rubber cylinder 212, and finally make the rubber cylinder 212 fit against the inner side of the casing 10, realizing the sealing of the casing 10 by the first sealing packer 21 and the second sealing packer 22. After the rubber cylinder 212 fits against the inner side of the casing 10, the first extrusion cylinder 213 stops moving, and the abutting member 216 will drive the first clamping cylinder 214 to move towards the first expansion inclined surface 2131, expanding the port of the first clamping cylinder 214, and finally realizing the clamping of the first clamping cylinder 214 with the inner side of the casing 10.

[0111] With the above settings, it is only necessary to introduce liquid into the inside of the pipe string 20 after throwing a ball and applying pressure to achieve the sealing and clamping between the first sealing packer 21 and the second sealing packer 22 and the casing 10.

[0112] In another embodiment provided by the present application, as Figure 2 and 5 shown in FIG. -6, the hydraulic piston 215 further includes:

[0113] A second driving cylinder 221. A second hydraulic port 2112 is provided on the surface of the fixing cylinder 211. The second hydraulic port 2112 is located between the first hydraulic port 2111 and the abutting member 216. The second driving cylinder 221 is sleeved on the surface of the fixing cylinder 211 and is located on the side of the second hydraulic port 2112 close to the first clamping cylinder 214, and the second driving cylinder 221 is fixedly connected to the first driving cylinder 218;

[0114] A second fixing member 222. The second fixing member 222 is fixed to the surface of the fixing cylinder 211 and is located on the side of the second hydraulic port 2112 away from the first clamping cylinder 214, and the outer side surface of the second fixing member 222 is hermetically fitted with the inner side surface of the first driving cylinder 218.

[0115] Specifically, since the second driving cylinder 221 is sleeved on the side of the second hydraulic port 2112 close to the first clamping cylinder 214, and the second fixing member 222 is fixed to the side of the second hydraulic port 2112 away from the first clamping cylinder 214, the second driving cylinder 221 and the second fixing member 222 are located on both sides of the second hydraulic port 2112, and the outer side surface of the second fixing member 222 is in sealing fit with the inner side surface of the first driving cylinder 218, so that a hydraulic cavity 2113 is formed by enclosing the second fixing member 222, the second driving cylinder 221 and the first driving cylinder 218. Liquid enters the hydraulic cavity 2113 from the second hydraulic port 2112. Since the second fixing member 222 is fixed to the surface of the fixed cylinder 211, therefore, as the hydraulic pressure in the hydraulic cavity 2113 increases, a driving force will be generated to act on the second driving cylinder 221 to move in the direction of the abutting member 216. This driving force and the acting force on the first driving cylinder 218 act on the abutting member 216 together, facilitating the sealing and clamping between the first sealing packer 21 and the second sealing packer 22 and the casing 10.

[0116] In another embodiment provided by the present application, as Figure 2 and 5 shown, the outer side surface of the fixed cylinder 211 is provided with ratchet teeth 2114, and both the first extrusion cylinder 213 and the abutting member 216 are clamped with the fixed cylinder 211 through the ratchet teeth 2114.

[0117] Specifically, due to the irreversibility of the ratchet teeth 2114, when the first extrusion cylinder 213 and the abutting member 216 move along the surface of the fixed cylinder 211, they cannot retreat, so that the sealing and clamping between the first sealing packer 21 and the second sealing packer 22 and the casing 10 can achieve self-locking after being completed, ensuring the stability of the first sealing packer 21 and the second sealing packer 22.

[0118] In another embodiment provided by the present application, as Figure 2-3 shown, the first sealing packer 21 and the second sealing packer 22 further include:

[0119] A second extrusion cylinder 223, the second extrusion cylinder 223 is sleeved on the surface of the fixed cylinder 211 and abuts against the other end of the rubber cylinder 212. The second extrusion cylinder 223; a second expansion inclined surface 2131 is provided at the end of the second extrusion cylinder 223 away from the rubber cylinder 212;

[0120] A second clamping cylinder 224, one end of the first clamping cylinder 214 is located on the expansion inclined surface 2131, and the other end of the first clamping cylinder 214 abuts against the surface of the fixed cylinder 211.

[0121] Specifically, before the liquid is injected, the abutting member 216, the first extrusion cylinder 213, and the second extrusion cylinder 223 are fixed to the surface of the fixed cylinder 211 by breakable pins 2132. With the above arrangement, after the rubber cylinder 212 receives a large extrusion force from the first extrusion cylinder 213, the breakable pins 2132 are truncated, and the rubber cylinder 212 is driven to move in the direction of the second extrusion cylinder 223, and the second extrusion cylinder 223 is driven to move and truncate the breakable pins 2132, so that the end of the second clamping cylinder 224 expands along the second expansion inclined surface 2131, and finally is clamped to the inner side surface of the casing 10, and together with the first clamping cylinder 214, the clamping seats of the first sealing packer 21 and the second sealing packer 22 are realized, providing stability for the clamping between the pipe string 20 and the casing 10, and improving the pressure-bearing and temperature-resistant performance of the first sealing packer 21 and the second sealing packer 22. At the same time, through the stable connection between the pipe string 20 and the casing 10, the inner diameter of the pipe string 20 can be appropriately enlarged, which is convenient for subsequent renovation operations.

[0122] In another embodiment provided by the present application, as Figure 2 and 4 shown, the first sealing packer 21 and the second sealing packer 22 further include:

[0123] Two expansion spacer rings 225, both of the two expansion spacer rings 225 are sleeved on the surface of the fixed cylinder 211, one of the expansion spacer rings 225 is located between the first extrusion cylinder 213 and the rubber cylinder 212, and the other expansion spacer ring 225 is located between the second extrusion cylinder 223 and the rubber cylinder 212.

[0124] Specifically, the two expansion spacer rings 225 can prevent the rubber cylinder 212 from deforming unilaterally, and improve the sealing effect and sealing stability between the rubber cylinder 212 and the casing 10.

[0125] In another embodiment provided by the present application, as Figure 1-2 shown, the first sealing packer 21 and the second sealing packer 22 further include:

[0126] A sealing short pipe 227, the lower end of the sealing short pipe 227 is sleeved on the upper end of the fixed cylinder 211 and is threadedly connected to the fixed cylinder 211;

[0127] An inserted sealing pipe 226, the lower end of the inserted sealing pipe 226 is inserted into the inside of the sealing short pipe 227 from the upper end of the sealing short pipe 227 and is threadedly connected to the sealing short pipe 227.

[0128] Specifically, inserting the sealing cylinder can improve the sealing performance between the first sealing packer 21 and the second sealing packer 22 and the pipe string 20. The screwing-in directions of the sealing short pipe 227 and the inserted sealing pipe 226 are opposite. With the above settings, only by rotating the pipe string 20 can the sealing short pipe 227 of the first sealing packer 21 be unscrewed, the upper end of the pipe string 20 be removed from the first sealing packer 21, and then after lowering the milling tool, the outer sides of the first clamping cylinder 214 and the second clamping cylinder 224 of the first sealing packer 21 can be milled, so that the first clamping cylinder 214 and the second clamping cylinder 224 are disengaged from the inner wall of the casing 10.

[0129] In this actual example, further, as Figure 1 shown, a milling extension cylinder 28 is provided at one end of the first sealing packer 21 and the second sealing packer 22 away from the sealing short pipe 227; after milling the first clamping cylinder 214 and the second clamping cylinder 224, a fishing tool can be lowered to remove the first sealing packer 21. After the first sealing packer 21 is removed, by continuing to rotate the pipe string 20, the sealing short pipe 227 of the second sealing packer 22 can be unscrewed, and then the milling tool is lowered again to mill the outer sides of the first clamping cylinder 214 and the second clamping cylinder 224 of the second sealing packer 22, so that the first clamping cylinder 214 and the second clamping cylinder 224 are disengaged from the inner wall of the casing 10, and finally a fishing tool is lowered to remove the pipe string 20 through the milling extension cylinder 28 of the second sealing packer 22. With the above settings, it is convenient for the pipe string 20 to be released from the stuck position and fished.

[0130] In another embodiment provided by the present application, as Figure 1 and 8 shown in -11, the pipe string 20 further includes a first circulating sliding sleeve 24, and the first circulating sliding sleeve 24 includes:

[0131] An outer sleeve 242, both ends of the outer sleeve 242 are fixed on the pipe string 20, a travel groove 2421 is arranged inside the outer sleeve 242, and a first through hole 241 is arranged on the surface of the outer sleeve 242 and communicated with the travel groove 2421;

[0132] An inner sliding cylinder 243, the inner sliding cylinder 243 is slidably connected in the travel groove 2421 and is in sealing fit with the inner wall of the travel groove 2421, and an air inlet through groove 2431 is arranged on the surface of the inner sliding cylinder 243, and the air inlet through groove 2431 is communicated with the first through hole 241 as the inner sliding cylinder 243 slides.

[0133] Specifically, by lowering the driving tool 245, the inner sliding cylinder 243 can be driven to slide along the surface of the stroke groove 2421. When the air intake through groove 2431 is not communicated with the first through hole 241, the side wall of the inner sliding cylinder 243 will block the first through hole 241 to realize the closing of the injection hole. When the air intake through groove 2431 is communicated with the first through hole 241, the first through hole 241 is communicated with the inside of the inner sliding cylinder 243, and the first through hole 241 is in an open state. Through the setting of the above structure, by lowering the driving tool 245 corresponding to the first circulating sliding sleeve 24, the opening and closing of the first through hole 241 can be realized, which provides convenience for the injection and production work of the process string.

[0134] In another embodiment provided by the present application, as Figure 1 shown, the pipe string 20 further includes a second circulating sliding sleeve 25 having the same structure as the first circulating sliding sleeve 24. The second circulating sliding sleeve 25 is fixed to the side of the first sealing packer 21 away from the first circulating sliding sleeve 24 through an outer sleeve 242. A second through hole 2511 is provided on the surface of the second circulating sliding sleeve 25.

[0135] Specifically, after ball dropping and pressure pumping, the second through hole 2511 of the second circulating sliding sleeve 25 is opened through the driving tool 245, and a protective liquid is injected into the casing 10. When the protective liquid rises to a certain height, it will flow into the pipe string 20 from the second through hole 2511 and finally fill the casing 10 above the first sealing packer 21. When injecting the protective liquid into the pipe string 20 again, a small amount of air bubbles will be formed in the pipe string 20, which will affect the ball dropping and pressure pumping of the pipe string 20. Therefore, before ball dropping and pressure pumping, the air bubbles in the pipe string 20 need to be discharged in time. Through the setting of the second through hole 2511, the air bubbles in the pipe string 20 can be directly discharged through the second through hole 2511 without being discharged from the upper mouth of the pipe string 20, effectively improving the discharge efficiency of the air bubbles; during oil production, the protective liquid above the first sealing packer 21 will provide a certain hydraulic pressure for the pipe string 20, which is balanced with the driving force of the oil body acting on the pipe string 20 during oil production to make the pipe string 20 stable. At the same time, the second circulating sliding sleeve 25 can provide certain assistance for gas production above the first sealing packer 21. In addition, since when closing the first through hole 241 of the first circulating sliding sleeve 24, the second through hole 2511 of the second circulating sliding sleeve 25 will be opened, resulting in the protective liquid flowing into the pipe string from the second through hole 2511, therefore, the second through hole 2511 needs to be closed again to replenish the protective liquid.

[0136] In another embodiment provided by the present application, the installation direction of the second circulating sliding sleeve 25 is opposite to that of the first circulating sliding sleeve 24, and the air intake through groove 2431 deviates from the center of the inner sliding cylinder 243.

[0137] Specifically, through this setting, as the driving tool 245 is lowered, it is possible to open the first through-hole 241 while closing the second through-hole 2511, or to close the first through-hole 241 while opening the second through-hole 2511, which facilitates the injection and production operations of the process string.

[0138] In another embodiment provided by the present application, as shown in FIGS. 8-11, the inner side surface of the inner sliding cylinder 243 is provided with a first hook groove 2432 and a second hook groove 2433 symmetrically arranged with respect to the first hook groove 2432. The first hook groove 2432 and the second hook groove 2433 are respectively located on both sides of the air intake through groove 2431. The side walls of the first hook groove 2432 and the second hook groove 2433 close to the end of the inner sliding cylinder 243 are perpendicular to the bottom wall of the first hook groove 2432, and the other side walls of the first hook groove 2432 and the second hook groove 2433 are inclined in the direction away from the end of the inner sliding cylinder 243.

[0139] Specifically, as Figure 9 and 11 shown, the driving tool 245 for driving the inner sliding cylinder 243 to act includes a tool body 2451, an elastic member 2452, and an adapter cylinder 2453. The adapter cylinder 2453 is sleeved on the surface of the tool body 2451. The elastic member 2452 is located between the adapter cylinder 2453 and the tool body 2451 and is elastically connected to the adapter cylinder 2453. The outer side surface of the adapter cylinder 2453 is provided with a clamping protrusion 2454 adapted to the first hook groove 2432 and the second hook groove 2433. One side wall of the clamping protrusion 2454 is perpendicular to the surface of the adapter cylinder 2453, and the other side wall of the clamping protrusion 2454 is inclined with respect to the surface of the adapter cylinder 2453.

[0140] In this embodiment, further, the first hook groove 2432 of the first circulating sliding sleeve 24 is located above the second hook groove 2433, and the first hook groove 2432 of the second circulating sliding sleeve 25 is located below the second hook groove 2433. Through the above settings, when the driving tool 245 is lowered to one side of the first hook groove 2432 of the second circulating sliding sleeve 25, the clamping protrusion 2454 enters the first hook groove 2432 under the action of the elastic member 2452, so that the side wall of the clamping protrusion 2454 perpendicular to the adapter cylinder 2453 abuts against the side wall of the second hook groove 2433 perpendicular to the second hook groove 2433, driving the inner sliding sleeve to slide along the stroke groove 2421, and aligning the air intake through groove 2431 with the second through-hole 2511 to open the second through-hole 2511; when the driving tool 245 continues to be lowered so that the clamping protrusion 2454 is lowered to one side of the second hook groove 2433 of the first circulating sliding sleeve 24, the inner sliding cylinder 243 is driven to move in the same manner to close the first through-hole 241.

[0141] If the insertion direction of the driving tool 245 is changed, when the clamping protrusion 2454 enters the first hook groove 2432 of the first circulation sleeve 24 and the second hook groove 2433 of the second circulation sleeve 25 under the action of the elastic member 2452, pulling up the driving tool 245, the driving tool 245 will drive the inner sliding cylinder 243 to move in the same way, and the opening of the first through hole 241 on the first circulation sleeve 24 and the closing of the second through hole 2511 on the second circulation sleeve 25 will be realized.

[0142] The other side walls of the first hook groove 2432 and the second hook groove 2433 are inclined away from the end of the inner sliding cylinder 243 to facilitate the sliding of the clamping protrusion 2454 out of the first hook groove 2432 and the second hook groove 2433.

[0143] Except for this embodiment, the installation method in which the first hook groove 2432 of the first circulation sleeve 24 is located below the second hook groove 2433 and the first hook groove 2432 of the second circulation sleeve 25 is located above the second hook groove 2433 is also feasible.

[0144] In another embodiment provided by the present application, as shown in FIGS. 8 and 11, pressing inclined surfaces 2524 extending away from the stroke groove 2421 are provided on both side walls of the stroke groove 2421.

[0145] Specifically, an unlocking inclined surface 2455 is provided at the end of the adapter sleeve 2453. When the driving tool 245 enters the first hook groove 2432 or the second hook groove 2433, the unlocking inclined surface 2455 abuts against the pressing inclined surface 2524, so that when the driving tool 245 is pulled up or inserted further, the driving tool 245 will slide out of the first hook groove 2432 or the second hook groove 2433 under the action of the unlocking inclined surface 2455 and the pressing inclined surface 2524, facilitating the pulling up and insertion of the driving tool 245.

[0146] In another embodiment provided by the present application, as shown in FIGS. 8-10, an annular groove 2422 is provided on the inner wall of the stroke groove 2421. The annular groove 2422 is located on one side of the first through hole 241 and communicates with the first through hole 241, and the air inlet through groove 2431 communicates with the annular groove 2422 as the inner sliding cylinder 243 slides.

[0147] Specifically, the annular groove 2422 is an intermediate channel connecting the first through hole 241 and the air inlet through groove 2431, so that the air inlet through groove 2431 can communicate with the first through hole 241 without being aligned with the first through hole 241.

[0148] In another embodiment provided by the present application, as shown in FIGS. 8-10, a sealing ring 244 is provided between the outer sleeve 242 and the inner sliding cylinder 243. The sealing ring 244 is located on both sides of the annular groove 2422.

[0149] Specifically, the sealing ring 244 can seal the outer sleeve 242 and the inner sliding cylinder 243, preventing gas from leaking between the outer sleeve 242 and the inner sliding cylinder 243, and improving the steam injection efficiency of the pipe string 20.

[0150] In another embodiment provided by the present application, as shown in FIGS. 8-9 and 11, a locking protrusion 2434 is provided on the outer side surface of the inner sliding cylinder 243, and a locking groove 2423 adapted to the locking protrusion 2434 is provided on the inner side surface of the outer sleeve 242. When the air inlet channel 2431 communicates with the first through hole 241, the locking protrusion 2434 is clamped in the locking groove 2423.

[0151] Specifically, the cooperation of the locking groove 2423 and the locking protrusion 2434 can prevent the inner sliding cylinder 243 from accidentally sliding in the travel groove 2421.

[0152] In an embodiment provided by the present application, as shown in FIG. 12, a method for injection and production of an integrated process pipe string for oil and gas stratified injection and production is provided, including the following steps:

[0153] S100: Lower the process pipe string to a certain depth in the underground space so that the first gas injection port 11 is aligned with the upper gas layer and the second gas injection port 12 is aligned with the lower oil layer;

[0154] S200: Drop a ball into the pipe string 20 and apply pressure to make the first sealing packer 21 and the second sealing packer 22 firmly fixed on the inner side surface of the casing 10 and seal the casing 10;

[0155] S300: Utilize the energy of the oil layer itself to eject the oil body from the pipe string 20 until the energy of the oil layer is exhausted and the oil body cannot be ejected from the pipe string 20;

[0156] S400: Lower the plug into the landing nipple 23 to seal the pipe string 20 for storing the energy of the oil layer;

[0157] S500: Open the first through hole 241 and inject natural gas into the pipe string 20 to make the natural gas enter the gas layer;

[0158] S600: After a period of time, close the first through hole 241 and remove the plug, so that the oil layer uses the stored energy to eject the oil body from the pipe string 20;

[0159] S700: Open the first through hole 241 to inject gas into the upper gas layer and the lower oil layer simultaneously.

[0160] The embodiments of the present application have at least the following beneficial effects:

[0161] Through the injection-production method of this process string, it is possible to utilize the period of storing the energy of the lower oil layer to inject gas into the upper gas layer, effectively saving the time used in the gas injection process and effectively improving the gas injection efficiency of natural gas.

[0162] In this application, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0163] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application.

[0164] It should be noted that all the directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If this specific posture changes, then the directional indication will also change accordingly.

[0165] In this application, unless otherwise clearly specified and defined, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0166] In addition, in this application, descriptions such as "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0167] In the description of this specification, descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0168] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0169] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of this application. The scope of this application is defined by the claims and their equivalents.

Claims

1. An integrated process string for separate injection and production of oil and gas, characterized in that, the process string includes: a casing, on the surface of which a first gas injection port and a second gas injection port are provided; a string, which is inserted into the interior of the casing. The string is sequentially provided with a first sealing packer, a second sealing packer and a landing nipple from top to bottom. The first sealing packer is located above the first gas injection port, the second sealing packer is located between the first gas injection port and the second gas injection port, and the landing nipple is used for installing a plug in the string. A first through hole is provided on the surface of the string, and the first through hole is located between the first sealing packer and the second sealing packer; two expansion rings, both of which are sleeved on the surface of a fixed cylinder. One of the expansion rings is located between the first extrusion cylinder and the rubber barrel, and the other expansion ring is located between the second extrusion cylinder and the rubber barrel; the process string further includes a first circulation sliding sleeve, and the first circulation sliding sleeve includes: an outer sleeve, both ends of which are fixed on the string. A travel groove is provided inside the outer sleeve, and the first through hole is provided on the surface of the outer sleeve and communicates with the travel groove; an inner sliding cylinder, which is slidably connected in the travel groove and is in sealing fit with the inner wall of the travel groove. An air inlet through groove is provided on the surface of the inner sliding cylinder, and the air inlet through groove communicates with the first through hole as the inner sliding cylinder slides; the string further includes a second circulation sliding sleeve having the same structure as the first circulation sliding sleeve. The second circulation sliding sleeve is fixed on the side of the first sealing packer away from the first circulation sliding sleeve through the outer sleeve, and a second through hole is provided on the surface of the second circulation sliding sleeve.

2. The integrated process string for separate injection and production of oil and gas according to claim 1, characterized in that, both the first sealing packer and the second sealing packer include: a fixed cylinder, both ends of which are fixed on the string; a rubber barrel, which is sleeved on the surface of the fixed cylinder and is in contact with the inner side surface of the casing; a first extrusion cylinder, which is sleeved on the surface of the fixed cylinder and axially extrudes the rubber barrel; a first clamping cylinder, which is located on one side of the first extrusion cylinder, and the outer side surface of the first clamping cylinder is clamped with the inner side surface of the casing.

3. The integrated process string for separate injection and production of oil and gas according to claim 2, characterized in that, both the first sealing packer and the second sealing packer further include a hydraulic piston, and the hydraulic piston includes: a contact member, which is sleeved on the surface of the fixed cylinder and is located on one side of the first extrusion cylinder. A first expansion slope is provided at one end of the first extrusion cylinder away from the rubber barrel. One end of the first clamping cylinder is located on the first expansion slope, and the other end of the first clamping cylinder abuts against the contact member; a first fixing member, a first hydraulic port is provided on the surface of the fixed cylinder, and the first fixing member is sleeved on the surface of the fixed cylinder and is fixed on the side of the first hydraulic port away from the first clamping cylinder; The first driving cylinder, the first driving cylinder is sleeved on the surface of the fixed cylinder and is located on one side of the first hydraulic port close to the first clamping cylinder; The seal, the seal is fixed on the outer side surface of the first driving cylinder and extends towards the direction of the first fixing member, and the inner side surface of the seal is in sealing fit with the first fixing member.

4. The integrated oil-gas layered injection-production process string according to claim 3, characterized in that, The hydraulic piston further includes: The second driving cylinder, a second hydraulic port is provided on the surface of the fixed cylinder, the second hydraulic port is located between the first hydraulic port and the abutting member, the second driving cylinder is sleeved on the surface of the fixed cylinder and is located on one side of the second hydraulic port close to the first clamping cylinder, and the second driving cylinder is fixedly connected to the first driving cylinder; The second fixing member, the second fixing member is fixed on the surface of the fixed cylinder and is located on one side of the second hydraulic port away from the first clamping cylinder, and the outer side surface of the second fixing member is in sealing fit with the inner side surface of the first driving cylinder.

5. The integrated oil-gas layered injection-production process string according to claim 3, characterized in that, The outer side surface of the fixed cylinder is provided with ratchet teeth, and both the first extrusion cylinder and the abutting member are clamped to the fixed cylinder through the ratchet teeth.

6. The integrated oil-gas layered injection-production process string according to claim 3, characterized in that, The first sealing packer and the second sealing packer further include: The second extrusion cylinder, the second extrusion cylinder is sleeved on the surface of the fixed cylinder and abuts against the other end of the rubber cylinder, and a second expansion inclined surface is provided at one end of the second extrusion cylinder away from the rubber cylinder; The second clamping cylinder, one end of the second clamping cylinder is located on the second expansion inclined surface, and the other end of the first clamping cylinder abuts against the surface of the fixed cylinder.

7. The integrated oil-gas layered injection-production process string according to claim 2, characterized in that, The first sealing packer and the second sealing packer further include: The sealing short pipe, the lower end of the sealing short pipe is sleeved on the upper end of the fixed cylinder and is threadedly connected to the fixed cylinder; The inserted sealing pipe, the lower end of the inserted sealing pipe is inserted into the inside of the sealing short pipe from the upper end of the sealing short pipe and is threadedly connected to the sealing short pipe.

8. The integrated oil-gas layered injection-production process string according to claim 1, characterized in that, The installation direction of the second circulation sliding sleeve is opposite to the installation direction of the first circulation sliding sleeve, and the air inlet through groove deviates from the center of the inner sliding cylinder.

9. The integrated oil-gas layered injection-production process string according to claim 1, characterized in that, The inner side surface of the inner sliding cylinder is provided with a first hook groove and a second hook groove symmetrically arranged with the first hook groove, the first hook groove and the second hook groove are respectively located on both sides of the air inlet through groove, the side walls of the first hook groove and the second hook groove close to the end of the inner sliding cylinder are perpendicular to the bottom wall of the first hook groove, and the other side walls of the first hook groove and the second hook groove are inclined towards the direction away from the end of the inner sliding cylinder.

10. The integrated oil-gas layered injection-production process string according to claim 1, It is characterized in that pressing inclined surfaces extending away from the stroke groove are arranged on both side walls of the stroke groove.

11. The integrated oil and gas layered injection and production process string according to claim 1, It is characterized in that an annular groove is arranged on the inner wall of the stroke groove, the annular groove is located on one side of the first through hole and communicates with the first through hole, and the air inlet through groove communicates with the annular groove as the inner sliding cylinder slides.

12. The integrated oil and gas layered injection and production process string according to claim 1, It is characterized in that a sealing ring is arranged between the outer sleeve and the inner sliding cylinder, and the sealing ring is located on both sides of the annular groove.

13. The integrated oil and gas layered injection and production process string according to claim 1, It is characterized in that locking protrusions are arranged on the outer side surface of the inner sliding cylinder, locking grooves adapted to the locking protrusions are arranged on the inner side surface of the outer sleeve, and when the air inlet through groove communicates with the first through hole, the locking protrusions are clamped in the locking grooves.

14. An injection and production method based on the integrated oil and gas layered injection and production process string according to claim 1, It is characterized in that it includes the following steps: S100: Lower the process string to a certain depth in the underground space so that the first gas injection port is aligned with the upper gas layer and the second gas injection port is aligned with the lower oil layer; S200: Inject a ball and apply pressure into the string to make the first sealing packer and the second sealing packer stable on the inner side surface of the casing and seal the casing; S300: Use the energy of the oil layer itself to make the oil body spray out from the string until the energy of the oil layer is exhausted and the oil body cannot spray out from the string; S400: Lower the plugging device to the landing nipple to seal the string to store the energy of the oil layer; S500: Open the first through hole and inject natural gas into the string to make the natural gas enter the gas layer; S600: After a period of time, close the first through hole, remove the plugging device, and make the oil layer use the stored energy to make the oil body spray out from the string until the energy of the oil layer is exhausted and the oil body cannot spray out from the string; S700: Repeat steps S400 to S600 several times; until when the plugging device is removed for the last time, the oil body cannot spray out from the string; S800: Open the first through hole and inject gas into the upper gas layer and the lower oil layer simultaneously.

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