Extraction equipment for deep sea oil drilling

Abstract

The extraction equipment for deep-sea oil drilling relates to the technical field of deep-sea oil drilling and comprises a gas lift valve body, the gas lift valve body comprises a valve body arranged outside, a valve seat is installed at an opening in the bottom end of the valve body, an outer valve cylinder is fixedly installed at the top end in the valve body, and an inner valve cylinder is supported on the inner wall of a notch of the outer valve cylinder; and the inner valve cylinder is nested in the outer valve cylinder. According to the extraction equipment for deep-sea oil drilling, the working process is self-triggered completely by means of the pressure difference between the pressure in an oil pipe and the elastic force of a spring, external control signals are not needed, and the extraction equipment is divided into two working periods of an oil reservoir high-pressure stage and an oil reservoir pressure attenuation stage; furthermore, through the collaborative design of gas lift valve integrated layout, passive self-triggering control and graded gas storage and gas injection, the deep-sea oil well lifting device is adaptive to the complex environment with high pressure, low temperature and limited operation space in the deep sea, can dynamically adjust the lifting strategy according to oil reservoir pressure attenuation, and effectively solves the lifting problem of a low-yield and high-viscosity deep-sea oil well.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of deep-sea oil drilling, in particular to a deep-sea oil drilling extraction equipment. BACKGROUND

[0002] The gas lift is one of the oil extraction methods with outstanding economic benefits in the modern oil and gas exploitation field, and its core advantage is that it is not limited by the depth of the oil well. By injecting high-pressure gas from top to bottom, it can effectively reduce the weight of the liquid column at the bottom of the oil pipe and the back pressure of the oil layer, and ensure the continuous and stable production of the oil well. It is widely used in the exploitation of land and shallow sea oil and gas fields.

[0003] However, in the exploitation of deep-sea low-yield and high-viscosity reservoirs, the adaptability defects of the existing gas lift method for oil extraction technology are increasingly prominent, and it is difficult to meet the actual operation requirements. On the one hand, for low-yield deep-sea wells, due to the slow inflow of crude oil into the wellbore, the liquid column accumulates less and the replenishment period is long. Under the existing continuous gas lift mode, the injected high-pressure gas is easy to directly penetrate the thin liquid column and flow rapidly, which cannot form an effective lifting power with the crude oil, not only leading to a significant decrease in lifting efficiency, but also easily causing the "empty lifting" phenomenon of only gas but no oil, resulting in waste of gas source and invalid loss of equipment. On the other hand, for deep-sea high-viscosity crude oil, the gas-liquid mixing effect of the existing gas lift technology is poor, and the dispersion thrust generated by the expansion of the gas is difficult to overcome the viscous resistance of the viscous oil flow, resulting in the retention of oil flow in the wellbore. Although it can be improved by adding chemical viscosity reducers, the medicament injection system is complex, the cost is high, and it is easy to cause secondary pollution of the marine environment, further increasing the process complexity and operation difficulty.

[0004] Especially critical is that deep-sea exploitation faces special challenges such as high pressure, low temperature, limited operation space, and difficult remote operation: the existing gas lift equipment relies on continuous gas injection mode, which requires long-term maintenance of ultra-high injection pressure to overcome the deep-sea hydrostatic pressure, resulting in a sharp increase in compressor energy consumption and an increase in power supply load on the offshore platform. Although the intermittent gas lift scheme attempts to alleviate the gas channeling problem, it uses a fixed trigger pressure design, which cannot adapt to the pressure decay process of the entire life cycle of the reservoir exploitation. As the formation pressure decreases, problems such as "trigger failure" or "insufficient lifting thrust" may occur, requiring frequent underwater workover operations to replace parts. Deep-sea workover operations are long and costly, which seriously affects the economic efficiency of exploitation. At the same time, the existing gas lift system relies on underwater remote control modules to achieve gas injection regulation and control. In the complex deep-sea environment, problems such as signal transmission delay and control module corrosion failure occur frequently, further reducing the system operation reliability.

[0005] In summary, the existing gas lift method of oil extraction technology has multiple defects such as gas channeling, insufficient lifting thrust, high process complexity, high energy consumption and high operation and maintenance cost, poor operation reliability, and is difficult to meet the needs of efficient and economic exploitation of deep-sea oil and gas, and it is urgent to develop a gas lift oil extraction technology scheme that can adapt to the special environment of deep sea and accurately match the dynamic changes of reservoir pressure. SUMMARY

[0006] The present application aims to provide a deep-sea oil drilling extraction equipment to solve the problems raised in the above background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a deep-sea oil drilling extraction equipment, comprising a gas lift valve body, the gas lift valve body comprises a valve body arranged outside, a valve seat is installed at the bottom end of the valve body, and an outer valve cylinder is fixedly installed at the top end inside the valve body, the outer valve cylinder is supported by an inner valve cylinder in the recessed inner wall, the inner valve cylinder is nested inside the outer valve cylinder, a first gas storage cavity is formed in the inner valve cylinder, a connector is horizontally connected to the side end of the first gas storage cavity, and the connector extends horizontally outside the valve body, a bend pipe is connected to the side end of the bottom of the first gas storage cavity, and the end of the bend pipe is connected to one side of the recess of the outer valve cylinder, a second gas storage cavity is arranged in the gap between the inner valve cylinder and the outer valve cylinder, and a horizontal pipe is connected to the side end of the bottom of the second gas storage cavity, and the end of the horizontal pipe is connected to the other side of the recess of the outer valve cylinder.

[0008] Further, an intermittent gas lift assembly is installed at the bottom end inside the valve body, the intermittent gas lift assembly comprises a valve core in sealing cooperation with the valve seat, a stepped sealing surface is arranged on the outer edge of the valve core, and the stepped sealing surface of the convex letter-shaped cross-section structure of the valve core is in two-stage sealing cooperation with the stepped cross-section structure of the valve seat.

[0009] Further, the intermittent gas lift assembly further comprises a valve rod fixedly connected to the top end of the valve core, the valve rod vertically ascends inside the recess of the outer valve cylinder, a main spring is connected to the top end of the valve rod, and the valve rod is elastically connected to the groove bottom of the recess of the outer valve cylinder through the main spring.

[0010] Further, the intermittent gas lift assembly further comprises a through inlet radially penetrating and communicating with the top end of the valve rod, a first exhaust pipe is connected to the bottom end of one side of the through inlet, the first exhaust pipe is communicated with the first gas storage cavity through the bend pipe of the adjacent side edge when reaching a preset height, and the end of the first exhaust pipe is communicated with the first sealing surface of the stepped sealing surface.

[0011] Further, the intermittent gas lift assembly further comprises a second exhaust pipe connected to the other side of the bottom end of the through inlet, the second exhaust pipe is communicated with the second gas storage cavity through the horizontal pipe of the adjacent side edge when reaching a preset height, and the end of the second exhaust pipe is communicated with the second sealing surface of the stepped sealing surface.

[0012] Further, the primary gas storage cavity and the secondary gas storage cavity are connected through a double-cavity communication assembly, the double-cavity communication assembly comprises a communication port vertically connected between the primary gas storage cavity and the secondary gas storage cavity, the end of the communication port is fixed with a mounting seat, and the inside of the mounting seat is connected with a secondary spring.

[0013] Further, the double-cavity communication assembly further comprises a one-way valve elastically connected to the end of the secondary spring, the one-way valve is vertically lifted inside the communication port, and bypass ports are communicated on both sides of the one-way valve, and the primary gas storage cavity is communicated with the secondary gas storage cavity through the two bypass ports and the hole in the mounting seat.

[0014] Further, the valve body is mounted on the sidewall of the oil pipe, and the valve body is distributed along the axial direction of the oil pipe.

[0015] Further, a side groove for accommodating the valve body is recessed in the sidewall of the oil pipe, a partition plate is fixedly arranged in the inside of the side groove, and a connecting port communicated with the axial flow channel of the oil pipe is left at the bottom end of the partition plate.

[0016] Further, the oil pipe is nested in the sleeve, and a compressed gas pipe is communicated in the annular space between the oil pipe and the sleeve, the output end of the compressed gas pipe is connected with the joint on the outer wall of each valve body through an electromagnetic three-way valve, and the input end of the compressed gas pipe is connected with the gas outlet of the gas compressor.

[0017] The application provides a deep-sea oil drilling extraction device, which has the following beneficial effects. 1、The working process of the application is completely triggered by the pressure difference between the pressure in the oil pipe and the spring force, without external control signals, and is divided into two working periods of oil reservoir high pressure stage and oil reservoir pressure decay stage, further, through the integrated layout of the gas lift valve, passive self-triggering control and collaborative design of staged gas storage and gas injection, the device is suitable for complex environments such as deep-sea high pressure, low temperature and limited operation space, and can dynamically adjust the lifting strategy according to the oil reservoir pressure decay, effectively solving the lifting problem of low-yield and high-viscosity deep-sea oil wells.

[0018] 2、The application can accurately set the two-stage trigger pressure and the gas injection amount by pre-tightening the ground main spring, match the lifting needs of different viscosity crude oils, realize automatic triggering by the pressure difference between the pressure in the oil pipe and the spring force, without additional configuration of underwater control module and signal transmission system, avoid the problems such as signal delay and equipment failure of remote control in deep-sea complex environment, greatly improve the stability and reliability of the device operation, and reduce the maintenance cost of deep-sea operation.

[0019] 3. This application sets up two-stage gas storage chambers and two-stage trigger thresholds, which can automatically switch the gas injection mode according to the dynamic changes of reservoir pressure. During the high-pressure stage of the reservoir, only the first-stage gas storage chamber is activated to avoid gas waste. During the pressure decay stage, the two chambers work together to inject gas, which significantly improves the pulse thrust and effectively solves the lifting problem of low-yield, high-viscosity crude oil. This enables the reservoir to adapt to the entire life cycle of production without the need for frequent tubing string tripping and component replacement. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a schematic diagram of the secondary exhaust trigger state changes of the present invention; Figure 3 This is a schematic cross-sectional view of the oil pipe of the present invention; Figure 4 This is a schematic cross-sectional view of the valve body of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a schematic diagram of the intermittent airlift assembly structure of the present invention; Figure 7 This is a cross-sectional view of the main body of the air lift valve of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point B.

[0021] In the diagram: 1. Air lift valve body; 101. Valve body; 102. Valve seat; 103. Outer valve cylinder; 104. Inner valve cylinder; 105. Primary air storage chamber; 106. Connector; 107. Bend; 108. Secondary air storage chamber; 109. Horizontal pipe; 2. Intermittent air lift assembly; 201. Valve core; 202. Stepped sealing surface; 203. Valve stem; 204. Main spring; 205. Inlet; 206. Primary exhaust pipe; 207. Secondary exhaust pipe; 3. Dual-chamber connection assembly; 301. Connecting port; 302. Mounting base; 303. Secondary spring; 304. Check valve; 305. Bypass port; 4. Oil pipe; 5. Side groove; 6. Partition plate; 7. Connection port; 8. Sleeve; 9. Compressed air pipe; 10. Gas compressor. Detailed Implementation

[0022] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention. Please see Figures 3 to 7This invention provides a technical solution: an extraction device for deep-sea oil drilling, comprising a gas lift valve body 1, the gas lift valve body 1 including an external valve body 101, a valve seat 102 installed at the bottom opening of the valve body 101, and an outer valve cylinder 103 fixedly installed at the top inside the valve body 101. An inner valve cylinder 104 is supported by the inner wall of the recess of the outer valve cylinder 103, and the inner valve cylinder 104 is nested inside the outer valve cylinder 103. A primary gas storage chamber 105 is formed inside the inner valve cylinder 104. A connector 106 is horizontally connected to the side end of the gas storage chamber 105, and the connector 106 extends horizontally beyond the valve body 101. A bend 107 is connected to the bottom side end of the primary gas storage chamber 105, and the end of the bend 107 is connected to one side of the recess of the outer valve cylinder 103. A secondary gas storage chamber 108 is provided in the gap between the inner valve cylinder 104 and the outer valve cylinder 103, and a horizontal pipe 109 is connected to the bottom side end of the secondary gas storage chamber 108, and the end of the horizontal pipe 109 is connected to the other side of the recess of the outer valve cylinder 103. The specific operation is as follows: The working process of this scheme relies entirely on the pressure difference between the pressure inside the tubing 4 and the spring force to trigger the operation. No external control signal is required. The operation is divided into two working cycles: the high pressure stage and the low pressure stage. In the high pressure stage, the high pressure gas in the annular space is sequentially filled into the primary gas storage chamber 105 and the secondary gas storage chamber 108 through the gas pipe joint 106. After the pressure in both chambers reaches the system set value, the one-way valve 304 between the chambers is closed, and the two chambers remain in the gas storage state. At this time, the liquid column pressure inside the tubing 4 is high, the valve stem 203 is pressed upward by the pressure inside the tubing 4, the main spring 204 is in the compressed state, and the stepped sealing surface 202 of the valve seat 102 and the valve core 201 are double-sealed. Gas is not injected into the tubing 4. This application, through the integrated layout of the gas lift valve, passive self-trigger control, and the coordinated design of staged gas storage and injection, is not only suitable for the complex environment of deep-sea high pressure, low temperature, and limited working space, but also can dynamically adjust the lifting strategy according to the low pressure of the reservoir, effectively solving the lifting problem of low-yield, high-viscosity deep-sea oil wells. Please see Figures 6 to 8An intermittent air lift assembly 2 is installed at the bottom of the valve body 101. The intermittent air lift assembly 2 includes a valve core 201 that seals with the valve seat 102. The outer edge of the valve core 201 has a stepped sealing surface 202. The stepped sealing surface 202 of the valve core 201 with a convex cross-section structure and the stepped cross-section structure of the valve seat 102 with a narrow upper and wide lower section provide a two-stage sealing fit. The intermittent air lift assembly 2 also includes a valve stem 203 fixedly connected to the top of the valve core 201. The valve stem 203 rises and falls vertically inside the recess of the outer valve cylinder 103. The top end is connected to a main spring 204, and the valve stem 203 is elastically connected to the bottom of the notch of the outer valve cylinder 103 via the main spring 204. The intermittent air lift assembly 2 also includes a radially penetrating inlet 205 that is connected to the top end of the valve stem 203. The bottom end of one side of the inlet 205 is connected to a primary exhaust pipe 206, and when the primary exhaust pipe 206 reaches a preset height, it is connected to the primary air storage chamber 105 via a bend 107 on the adjacent side. The end of the primary exhaust pipe 206 is connected to the primary sealing surface of the stepped sealing surface 202. The intermittent airlift assembly 2 also includes a secondary exhaust pipe 207 connected to the other side of the bottom end of the inlet 205. When the secondary exhaust pipe 207 reaches a preset height, it is connected to the secondary air storage chamber 108 through the horizontal pipe 109 on the adjacent side. The end of the secondary exhaust pipe 207 is connected to the secondary sealing surface of the stepped sealing surface 202. The primary air storage chamber 105 and the secondary air storage chamber 108 are connected by a dual-chamber connection assembly 3. The dual-chamber connection assembly 3 includes a vertical connection between the primary air storage chamber 105 and the secondary air storage chamber 108. The connecting port 301 between 08 has a mounting base 302 fixed at the end of the connecting port 301, and the inner side of the mounting base 302 is connected to the auxiliary spring 303. The double-chamber connecting assembly 3 also includes a one-way valve 304 elastically connected to the end of the auxiliary spring 303. The one-way valve 304 is located inside the connecting port 301 and moves vertically. The one-way valve 304 has bypass ports 305 through both sides. The primary gas storage chamber 105 is connected to the secondary gas storage chamber 108 through the bypass ports 305 on both sides and the hole in the mounting base 302. The specific operation is as follows: In the initial stage of extraction, as the crude oil rises, the liquid volume in the oil pipe 4 decreases, and the pressure gradually drops to the first-stage trigger threshold of the main spring 204. At this time, the pressure in the oil pipe 4 cannot balance the first-stage elastic force of the spring. The valve stem 203 drives the valve core 201 to move downward, causing the first-stage valve port of the stepped sealing surface 202 corresponding to the first-stage exhaust pipe 206 to open. At this time, the inlet 205, which is radially penetrating at the top of the valve stem 203, is connected to the bent pipe 107 at the bottom side of the first-stage gas storage chamber 105. The compressed gas in the first-stage gas storage chamber 105 enters the first-stage exhaust pipe 206 through the inlet 205 and is finally injected into the oil pipe 4 through the first-stage valve port. After the gas is injected, it mixes with the crude oil in the oil pipe 4, the liquid column density decreases, and the pressure rises. When the oil... When the pressure inside pipe 4 exceeds the first-stage spring force, valve stem 203 returns to its original position, and the first-stage valve port of stepped sealing surface 202 closes, completing one pulse lifting cycle. During this stage, the second-stage gas storage chamber 108 does not participate in the operation; the gas in the first-stage gas storage chamber 105 alone is sufficient to meet the lifting requirements. This application, through the pre-tensioning force of the main spring 204 on the ground, can precisely set the two-stage trigger pressure and injection volume to match the lifting requirements of crude oils with different viscosities. Automatic triggering is achieved by relying on the pressure difference between the pressure inside pipe 4 and the spring force, eliminating the need for additional underwater control modules and signal transmission systems. This avoids problems such as signal delay and equipment failure in remote control under complex deep-sea environments, significantly improving the stability and reliability of equipment operation and reducing the risk of deep-sea accidents. The maintenance cost of offshore operations, and during the reservoir pressure decay stage, which is in the middle and late stages of extraction, the formation pressure decreases, causing the reservoir pressure to drop further. The crude oil flow rate into the wellbore slows down, the accumulation of liquid column in tubing 4 decreases, and the pressure further drops to the secondary trigger threshold of the main spring 204. At this time, the descent stroke of the valve stem 203 is further extended on the original basis, so that the primary valve port and the secondary valve port of the stepped sealing surface 202 open synchronously. At this time, one end of the radially penetrating inlet 205 at the top of the valve stem 203 remains connected to the bend 107 at the bottom side of the primary gas storage chamber 105, while the other end of the inlet 205, after descending to the preset height, is connected to the horizontal pipe 109 at the bottom side of the secondary gas storage chamber 108. High-pressure gas in the gas storage chamber 105 and the secondary gas storage chamber 108 is simultaneously injected into the tubing 4 through two-stage valve ports. The gas injection volume is significantly increased compared to the initial stage of extraction, forming a stronger pulse thrust that pushes high-viscosity crude oil upward. At the same time, gas expansion can further reduce the back pressure of the liquid column, helping the formation crude oil to continuously flow into the wellbore. This application sets two-stage gas storage chambers and two-stage trigger thresholds, which can automatically switch the gas injection mode according to the dynamic changes of reservoir pressure. During the high-pressure stage of the reservoir, only the primary gas storage chamber 105 is activated to avoid gas waste. During the pressure decay stage, the two chambers work together to inject gas, significantly improving the pulse thrust and effectively solving the problem of lifting low-yield, high-viscosity crude oil. This enables adaptive extraction throughout the entire life cycle of the reservoir without the need for frequent tubing string tripping and component replacement. Please see Figures 1 to 3The valve body 101 is installed on the side wall of the oil pipe 4, and the valve body 101 is distributed with varying pitch along the axial direction of the oil pipe 4. The side wall of the oil pipe 4 is recessed and has a side groove 5 for accommodating the valve body 101. A partition 6 is fixed in the inner opening of the side groove 5, and the bottom end of the partition 6 has a connection port 7 that communicates with the axial flow channel of the oil pipe 4. The oil pipe 4 is nested inside the sleeve 8, and a compressed air pipe 9 is connected in the annular space between the oil pipe 4 and the sleeve 8. The output end of the compressed air pipe 9 is connected to the joint 106 on the outer wall of the valve body 101 at various locations through a solenoid three-way valve, and the input end of the compressed air pipe 9 is connected to the outlet of the gas compressor 10. The specific operation is as follows: In this application, an air lift valve is integrated in the side groove 5 provided on the inner wall of the oil pipe 4. The air lift valve is distributed with varying pitch along the axial direction of the oil pipe 4. The sensing port of the air lift valve is connected to the axial flow channel of the oil pipe 4 through the connection port 7 at the bottom of the partition 6. A compressed air pipe 9 is installed through the annular space between the sleeve 8 and the oil pipe 4. The output end of the compressed air pipe 9 is connected to the joint 106 on the outer wall of the valve body 101 at various locations through electromagnetic three-way valves. The input end of the compressed air pipe 9 is connected to the outlet of the gas compressor 10.

[0023] In summary, when using this deep-sea oil drilling extraction equipment: First, this application integrates an air lift valve within the side groove 5 on the inner wall of the oil pipe 4. The air lift valve is distributed with varying pitch along the axial direction of the oil pipe 4. The sensing port of the air lift valve is connected to the axial flow channel of the oil pipe 4 through the connection port 7 at the bottom of the partition 6. A compressed air pipe 9 is installed through the annular space between the sleeve 8 and the oil pipe 4. The output end of the compressed air pipe 9 is connected to the connector 106 on the outer wall of the valve body 101 at various locations through electromagnetic three-way valves, while the input end of the compressed air pipe 9 is connected to the outlet of the gas compressor 10. The working process of this scheme relies entirely on the pressure difference between the pressure inside the oil pipe 4 and the spring force for self-triggering, without the need for external control signals. It is divided into two working cycles: the reservoir high-pressure stage and the reservoir pressure decay stage. In the reservoir high-pressure stage, the high-pressure gas in the annular space... The gas is sequentially filled into the primary gas storage chamber 105 and the secondary gas storage chamber 108 through the gas pipe connector 106. After the pressure in both chambers reaches the system set value, the one-way valve 304 between the chambers closes, and the two chambers remain in a gas storage state. At this time, the liquid column pressure in the oil pipe 4 is relatively high, and the valve stem 203 is pushed upward by the pressure in the oil pipe 4. The main spring 204 is in a compressed state, and the stepped sealing surface 202 of the valve seat 102 and the valve core 201 are double-sealed. Gas is not injected into the oil pipe 4. This application, through the integrated layout of the gas lift valve, passive self-trigger control, and staged gas storage and injection, is not only suitable for the complex environment of deep-sea high pressure, low temperature, and limited operating space, but also can dynamically adjust the lifting strategy according to the reservoir pressure decay, effectively solving the lifting problem of low-yield, high-viscosity deep-sea oil wells. Secondly, in the initial stage of extraction, as the crude oil rises, the liquid volume in the tubing 4 decreases, and the pressure gradually drops to the first-stage trigger threshold of the main spring 204. At this time, the pressure in the tubing 4 cannot balance the first-stage elastic force of the spring. The valve stem 203 drives the valve core 201 to move downward, causing the first-stage valve port of the stepped sealing surface 202 corresponding to the first-stage exhaust pipe 206 to open. At this time, the inlet 205, which is radially penetrating at the top of the valve stem 203, is connected to the bend 107 at the bottom side of the first-stage gas storage chamber 105. The compressed gas in the first-stage gas storage chamber 105 enters the first-stage exhaust pipe 206 through the inlet 205 and is finally injected into the tubing 4 through the first-stage valve port. After the gas is injected, it mixes with the crude oil in the tubing 4, the liquid column density decreases, and the pressure rises. When the pressure in the tubing 4 exceeds the threshold, the pressure increases. When the spring reaches its first-stage tension, the valve stem 203 returns to its original position, the first-stage valve port of the stepped sealing surface 202 closes, and one pulse lifting cycle is completed. During this stage, the second-stage gas storage chamber 108 does not participate in the operation, and the lifting requirements can be met solely by the gas in the first-stage gas storage chamber 105. This application uses the pre-tension force of the main spring 204 on the ground to accurately set the two-stage trigger pressure and gas injection volume to match the lifting requirements of crude oils with different viscosities. Automatic triggering is achieved by relying on the pressure difference between the pressure inside the oil pipe 4 and the spring tension. There is no need to configure an additional underwater control module and signal transmission system, which avoids the problems of signal delay and equipment failure in remote control in the complex environment of the deep sea, greatly improves the stability and reliability of equipment operation, and reduces the maintenance cost of deep-sea operations. Finally, during the reservoir pressure decay stage, which is in the middle and late stages of extraction, the formation pressure decreases, causing the reservoir pressure to drop further. The rate at which crude oil flows into the wellbore slows, the amount of liquid column accumulating in tubing 4 decreases, and the pressure further drops to the secondary trigger threshold of the main spring 204. At this point, the valve stem 203 extends its descent stroke further, causing the primary and secondary valve ports of the stepped sealing surface 202 to open synchronously. Meanwhile, one end of the radially penetrating inlet 205 at the top of the valve stem 203 remains connected to the bend 107 at the bottom side of the primary gas storage chamber 105, while the other end of the inlet 205, after descending to a preset height, connects to the horizontal pipe 109 at the bottom side of the secondary gas storage chamber 108. High-pressure gas in the primary gas storage chamber 105 and the secondary gas storage chamber 108 is simultaneously injected into the tubing 4 through two-stage valve ports. The gas injection volume is significantly increased compared to the initial stage of extraction, forming a stronger pulse thrust that lifts high-viscosity crude oil upwards. At the same time, gas expansion can further reduce the back pressure of the liquid column, helping the formation crude oil to continuously flow into the wellbore. This application, by setting two-stage gas storage chambers and two-stage trigger thresholds, can automatically switch the gas injection mode according to the dynamic changes in reservoir pressure. During the high-pressure stage of the reservoir, only the primary gas storage chamber 105 is activated to avoid gas waste. During the pressure decay stage, the two chambers work together to inject gas, significantly improving the pulse thrust and effectively solving the lifting problem of low-yield, high-viscosity crude oil. This enables adaptive extraction throughout the entire life cycle of the reservoir without the need for frequent tubing string tripping and component replacement.

[0024] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. An extraction device for deep-sea oil drilling, comprising a gas lift valve body (1), characterized in that, The air lift valve body (1) includes an external valve body (101), a valve seat (102) installed at the bottom opening of the valve body (101), and an external valve cylinder (103) fixedly installed at the top inside the valve body (101). An internal valve cylinder (104) is supported by the inner wall of the recess of the external valve cylinder (103), and the internal valve cylinder (104) is nested inside the external valve cylinder (103). A primary air storage chamber (105) is opened inside the internal valve cylinder (104), and a connector (1) is horizontally connected to the side end of the primary air storage chamber (105). 06), and the connector (106) extends horizontally to the outside of the valve body (101). The bottom side of the primary gas storage chamber (105) is connected to a bend (107), and the end of the bend (107) is connected to one side of the recess of the outer valve cylinder (103). A secondary gas storage chamber (108) is provided in the gap between the inner valve cylinder (104) and the outer valve cylinder (103). The bottom side of the secondary gas storage chamber (108) is connected to a horizontal pipe (109), and the end of the horizontal pipe (109) is connected to the other side of the recess of the outer valve cylinder (103).

2. The extraction equipment for deep-sea oil drilling according to claim 1, characterized in that, An intermittent air lift assembly (2) is installed at the bottom of the valve body (101). The intermittent air lift assembly (2) includes a valve core (201) that is sealed to the valve seat (102). The outer edge of the valve core (201) is provided with a stepped sealing surface (202), and the stepped sealing surface (202) of the valve core (201) with the convex cross-section structure is sealed to the valve seat (102) with a stepped cross-section structure that is narrow at the top and wide at the bottom in two stages.

3. The extraction equipment for deep-sea oil drilling according to claim 2, characterized in that, The intermittent air lift assembly (2) also includes a valve stem (203) fixedly connected to the top of the valve core (201). The valve stem (203) is vertically raised and lowered inside the recess of the outer valve cylinder (103), and a main spring (204) is connected to the top of the valve stem (203). The valve stem (203) is elastically connected to the bottom of the recess of the outer valve cylinder (103) through the main spring (204).

4. The extraction equipment for deep-sea oil drilling according to claim 3, characterized in that, The intermittent air lift assembly (2) also includes a radially penetrating inlet (205) connected to the top of the valve stem (203). The bottom end of one side of the inlet (205) is connected to a primary exhaust pipe (206). When the primary exhaust pipe (206) reaches a preset height, it is connected to the primary air storage chamber (105) through a bend (107) on the adjacent side. The end of the primary exhaust pipe (206) is connected to the primary sealing surface of the stepped sealing surface (202).

5. The extraction equipment for deep-sea oil drilling according to claim 4, characterized in that, The intermittent air lift assembly (2) also includes a secondary exhaust pipe (207) connected to the other side of the bottom of the inlet (205). When the secondary exhaust pipe (207) reaches the preset height, it is connected to the secondary air storage chamber (108) through the horizontal pipe (109) on the adjacent side, and the end of the secondary exhaust pipe (207) is connected to the secondary sealing surface of the stepped sealing surface (202).

6. The extraction equipment for deep-sea oil drilling according to claim 5, characterized in that, The primary gas storage chamber (105) and the secondary gas storage chamber (108) are connected by a dual-chamber communication assembly (3). The dual-chamber communication assembly (3) includes a communication port (301) that is vertically connected between the primary gas storage chamber (105) and the secondary gas storage chamber (108). The end opening of the communication port (301) is fixed with a mounting base (302), and a secondary spring (303) is connected to the inner side of the mounting base (302).

7. The extraction equipment for deep-sea oil drilling according to claim 6, characterized in that, The dual-chamber communication assembly (3) also includes a one-way valve (304) elastically connected to the end of the auxiliary spring (303). The one-way valve (304) is located inside the communication port (301) and moves vertically. The one-way valve (304) has bypass ports (305) running through both sides. The primary gas storage chamber (105) is connected to the secondary gas storage chamber (108) through the bypass ports (305) on both sides and the hole in the mounting base (302).

8. The extraction equipment for deep-sea oil drilling according to claim 7, characterized in that, The valve body (101) is installed on the side wall of the oil pipe (4), and the valve body (101) is distributed with varying pitch along the axial direction of the oil pipe (4).

9. The extraction equipment for deep-sea oil drilling according to claim 8, characterized in that, The oil pipe (4) has a recessed side groove (5) for accommodating the valve body (101), and a partition plate (6) is fixed inside the side opening of the side groove (5), and a connection port (7) is left at the bottom of the partition plate (6) to communicate with the axial flow channel of the oil pipe (4).

10. The extraction equipment for deep-sea oil drilling according to claim 9, characterized in that, The oil pipe (4) is nested inside the casing (8), and a compressed air pipe (9) is connected in the annular space between the oil pipe (4) and the casing (8). The output end of the compressed air pipe (9) is connected to the joint (106) on the outer wall of the valve body (101) at each location through an electromagnetic three-way valve, and the input end of the compressed air pipe (9) is connected to the outlet of the gas compressor (10).

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