Underground anti-channeling, temperature-control and pressure-control device and air injection anti-channeling, temperature-control and pressure-control integrated pipe column

Abstract

The invention relates to the field of air injection development, and discloses an underground anti-channeling temperature control and pressure control device and an air injection anti-channeling temperature control and pressure control integrated pipe column. The underground anti-channeling temperature control and pressure control device comprises a center pipe, an outer pipe and a sleeve valve; the lower portion of the sleeve valve is attached to the peripheral face of the center pipe so that the outer pipe can be spaced to form a pressure bearing cavity communicated with a lower end opening of the outer pipe, a liquid inlet hole is formed in the lower portion of the sleeve valve, and a through hole is formed in the center pipe. Therefore, the sleeve valve axially moves relative to the central pipe, so that the through hole and the liquid inlet hole are aligned or staggered. By means of the technical scheme, the flow of oil and gas conveying can be controlled through the ground pressure equipment, automatic closing can be achieved when the reservoir pressure is too large, and therefore other production equipment is protected, and guarantee is provided for safe production.

Description

Technical Field

[0001] The invention relates to the technical field of air injection development, in particular to an underground anti-channeling temperature and pressure control device, and to an air injection anti-channeling temperature and pressure control integrated pipe string. Background Art

[0002] Air injection technology is a technology for improving oil recovery by injecting air into the reservoir to make the crude oil in the formation undergo medium / high temperature oxidation reaction, which can replenish the formation energy, reduce the viscosity of crude oil, and greatly improve the oil recovery efficiency. Air injection technology currently includes heavy oil fire drive technology, heavy oil fire-assisted huff and puff technology, thin oil air injection hot miscible drive technology, thin oil air injection hot miscible huff and puff technology, etc. The flue gas generated by air injection technology is non-condensable gas, and the production well end will inevitably be a gas-liquid co-production situation. When some production wells have gas channeling, a large amount of gas is produced, which will gradually occupy the entire wellbore, resulting in excessively high pressure at the wellhead of the production well, and the production well cannot produce normally. At the same time, long-term gas channeling will also cause the high-temperature thermal front to enter, causing the temperature of the production well to rise sharply and damage the production well pipe string. At this time, the well can only be shut down at the wellhead, which not only affects the on-site production, but also brings production safety hazards.

[0003] In order to prevent the impact of gas production on production, the main equipment that can ensure the normal production of gas-liquid co-production conditions for gas injection development wells are downhole gas anchor devices and anti-air pumps. Foreign countries mainly use simple gas anchors and multi-stage simple gas anchors. The application of spiral gas anchors began in the late 1960s, and bowl-type gas anchors were used in oil fields in the 1970s. Due to the gradual accumulation of technology, during the 1980s, technicians improved the structure of spiral gas anchors, reducing the diameter while improving the gas separation efficiency. The widely used gas anchors in my country include sedimentation gas anchors, spiral gas anchors, eccentric gas anchors, new labyrinth gas anchors, etc. The main principle is to use the gravity separation principle combined with the centrifugal separation principle to separate gas and liquid, gas enters the casing, and liquid is produced from the oil pipe to achieve gas-liquid co-production, but its applicable gas-liquid ratio range is less than 500m3 / m3, and it is not suitable for conditions with higher gas-liquid ratios.

[0004] The development of the anti-gas oil pump is to adapt to the oil wells with high gas-liquid ratio, to prevent the oil pump from not working properly due to gas lock, and the anti-gas oil pump can also improve the pump efficiency in oil wells with low gas content. There are two main types of anti-gas pumps commonly used now. One is to change the internal structure of the oil pump to achieve the purpose of anti-gas lock. Commonly used are middle exhaust, hollow and pull-out anti-gas pumps. The other is to use some additional structures to open the fixed valve or the floating valve to achieve the purpose of anti-gas lock. The strong opening and closing type, pressurized type and ring valve type anti-gas pumps are more commonly used on site. The anti-gas pump can improve the pump efficiency, but this type of equipment can only ensure the normal production of the pump at a lower gas-liquid ratio. Whether it is an air anchor or an anti-gas pump, gas production and temperature cannot be adjusted underground. Summary of the invention

[0005] The purpose of the invention is to overcome the problem that the prior art cannot prevent gas channeling and control pressure underground.

[0006] In order to achieve the above-mentioned objectives, the present invention provides, on one hand, a downhole anti-channeling temperature and pressure control device, comprising a center tube, an outer tube sleeved on the center tube, and a tubular sleeve valve arranged between the center tube and the outer tube, the upper portion of the sleeve valve being fitted to the inner circumferential surface of the outer tube so as to be spaced from the center tube to form a pressure chamber, the lower portion of the sleeve valve being fitted to the outer circumferential surface of the center tube so as to be spaced from the outer tube to form a pressure chamber connected to the lower end port of the outer tube, the lower portion of the sleeve valve being provided with a liquid inlet hole, the center tube being provided with a through hole, the downhole anti-channeling temperature and pressure control device being capable of being configured to: pressurize the pressure chamber to adjust the pressure difference between the pressure chamber and the pressure chamber, thereby causing the sleeve valve to move axially relative to the center tube so as to align or stagger the through hole with the liquid inlet hole.

[0007] In some embodiments, the width of the through hole gradually increases from top to bottom, and the width of the liquid inlet hole is greater than or equal to the maximum width of the through hole.

[0008] In some embodiments, a sealing plug is provided at the lower end of the central tube.

[0009] In some embodiments, the outer tube is provided with a liquid outlet.

[0010] In some embodiments, an upper joint is further included, wherein the upper joint is partially inserted between the upper end of the outer pipe and the upper end of the central pipe.

[0011] In some embodiments, an air inlet passage communicating with the compression chamber is provided in the upper joint.

[0012] In some embodiments, a sealing ring is provided between the outer circumference of the upper joint and the inner circumference of the outer tube, and a sealing ring is provided between the inner circumference of the upper joint and the outer circumference of the central tube.

[0013] In some embodiments, a lower joint connected to the outer tube is further included.

[0014] In some embodiments, a sealing ring is provided between the outer circumference of the upper portion of the sleeve valve and the inner circumference of the outer tube, and a sealing ring is provided between the inner circumference of the lower portion of the sleeve valve and the outer circumference of the center tube.

[0015] In some embodiments, the upper portion and the lower portion of the sleeve valve are connected via a tapered pipe portion.

[0016] On the other hand, the present scheme also provides an air-injected anti-channeling temperature-control and pressure-control integrated tubing string, including an oil pipe, the downhole anti-channeling temperature-control and pressure-control device described in the above scheme, a pressure control pump, and a rod pump. The downhole anti-channeling temperature-control and pressure-control device is connected to the lower end of the oil pipe, the pressure control pump is connected to the pressure-injection chamber through a pressure-conducting pipe, and the rod pump is arranged in the oil pipe.

[0017] In some embodiments, a one-way valve is connected to the lower end of the downhole anti-channeling temperature and pressure control device, and a packer is provided on the one-way valve.

[0018] In some embodiments, a thermocouple and a control element thermally coupled to the downhole anti-channeling temperature and pressure control device are also included, and the thermocouple and the pressure control pump are in communication connection with the control element.

[0019] In some embodiments, the system further includes an air anchor disposed in the oil pipe and located at a lower side of the rod pump.

[0020] In some embodiments, it also includes a gas-liquid separation device connected to the oil pipe, a gas pipeline and a liquid pipeline connected to the gas-liquid separation device, a flow meter arranged on the gas-liquid separation device, and a liquid metering device arranged on the liquid pipeline.

[0021] Through the above technical solution, the downhole anti-channeling temperature and pressure control device can control the flow rate of oil and gas transportation through the ground pressure equipment, and can automatically close when the reservoir pressure is too high, thereby protecting other production equipment and providing guarantee for safe production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of the underground anti-channeling temperature and pressure control device described in the implementation mode of this scheme;

[0023] Figure 2 It is a structural schematic diagram of the integrated air injection, anti-channeling, temperature and pressure control string described in the implementation scheme of this scheme.

[0024] Description of Reference Numerals

[0025] 1 Upper connector 2 Air intake channel

[0026] 3 outer tubes 4 valves

[0027] 5 center tube 6 liquid outlet

[0028] 7 Liquid inlet hole 8 Through hole

[0029] 9 Sealing plug 10 Lower joint

[0030] 11 Pressure chamber 12 Pressure chamber

[0031] 13Underground anti-channeling temperature and pressure control device

[0032] 14 Packer 15 Check valve

[0033] 16 Thermocouple 17 Gas anchor

[0034] 18 rod pump 19 oil pipe

[0035] 20 pressure control pump 21 control element

[0036] 22 Gas-liquid separation device 23 Gas pipeline

[0037] 24 Liquid pipeline 25 Flow meter

[0038] 26 Liquid metering device 27 Pressure pipe DETAILED DESCRIPTION

[0039] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0040] In the present invention, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the relative position relationship in the use state. This is only to describe the present scheme more clearly, but should not be understood as a special limitation on the present scheme.

[0041] Embodiment 1

[0042] The present solution provides a downhole anti-channeling temperature and pressure control device, comprising a center tube 5, an outer tube 3 sleeved on the center tube 5, and a tubular sleeve valve 4 arranged between the center tube 5 and the outer tube 3, the upper part of the sleeve valve 4 is fitted to the inner circumferential surface of the outer tube 3 so as to be spaced from the center tube 5 to form a pressure chamber 11, the lower part of the sleeve valve 4 is fitted to the outer circumferential surface of the center tube 5 so as to be spaced from the outer tube 3 to form a pressure chamber 12 connected to the lower end port of the outer tube 3, the lower part of the sleeve valve 4 is provided with a liquid inlet hole 7, and the center tube 5 is provided with a through hole 8, the downhole anti-channeling temperature and pressure control device can be configured to: pressurize the pressure chamber 11 to adjust the pressure difference between the pressure chamber 11 and the pressure chamber 12, so that the sleeve valve 4 moves axially relative to the center tube 5, so that the through hole 8 is aligned with or staggered from the liquid inlet hole 7.

[0043] refer to Figure 1 As shown, an annulus is formed between the central pipe 5 and the outer pipe 3 , and the sleeve valve 4 is arranged in the annulus and can move axially under the action of pressure.

[0044] Among them, the sleeve valve 4 includes an upper part and a lower part, the upper part of which is spaced from the outer circumference of the center pipe 5 and fits with the inner circumference of the outer pipe 3 to form a pressure chamber, and the pressure chamber 11 is also roughly formed as an annulus; the pressure chamber 11 can be pressurized (gas or liquid is introduced) by ground pressure equipment to change the pressure therein; the lower part is fit with the outer circumference of the center pipe 5 and spaced from the inner circumference of the outer pipe 3 to form a pressure chamber 12, and the pressure chamber 12 can allow oil and gas in the reservoir to enter, that is, to withstand the pressure in the reservoir.

[0045] Under the action of the pressure difference between the pressure chamber 11 and the pressure chamber 12, the sleeve valve 4 can move axially, that is, when the pressure in the pressure chamber 11 is greater than the pressure in the pressure chamber 12, the sleeve valve 4 can be driven to move downward, and when the pressure in the pressure chamber 11 is less than the pressure in the pressure chamber 12, the sleeve valve 4 can be driven to move upward.

[0046] A through hole 8 is provided on the center tube 5, and a liquid inlet hole 7 is provided at the lower part of the sleeve valve 4. When the sleeve valve 4 moves axially to a position where the liquid inlet hole 7 and the through hole 8 are aligned with each other, the interior of the center tube 5 is communicated with the outer side of the sleeve valve 4 through the liquid inlet hole 7 and the through hole 8, that is, the center tube 5 is communicated with the pressure chamber 12, thereby allowing the oil and gas in the reservoir to enter the center tube 5 through the pressure chamber 12 and further be transported to the ground through the oil pipe; when the sleeve valve 4 moves axially so that the liquid inlet hole 7 and the through hole 8 are offset, the interior of the center tube 5 and the pressure chamber 12 are not communicated with each other, thereby prohibiting the oil and gas in the reservoir from being transported through the center tube 5.

[0047] In particular, the axial movement of the sleeve valve 4 can have an upper limit position (cannot move further upward) and a lower limit position (cannot move further downward). In the upper limit position, the liquid inlet hole 7 and the through hole 8 are staggered, and in the lower limit position, the liquid inlet hole 7 and the through hole 8 are aligned.

[0048] According to the pressure level in the reservoir, the pressure in the pressure chamber 11 can be controlled by a pressure device so that the pressure is at a predetermined value. When the pressure in the reservoir is less than the predetermined value, the sleeve valve 4 is moved downward to connect the liquid inlet hole 7 and the through hole 8, thereby allowing oil and gas to pass through the center pipe 5. When the pressure in the reservoir is higher than the predetermined value, the sleeve valve 4 is moved upward to disconnect the liquid inlet hole 7 and the through hole 8, thereby prohibiting oil and gas from passing through the center pipe 5.

[0049] Therefore, through the downhole anti-channeling temperature and pressure control device, when the reservoir pressure exceeds a predetermined value, for example, when gas channeling occurs, the downhole anti-channeling temperature and pressure control device can cut off the oil and gas transmission. Of course, in other cases, such as when the temperature is too high, the downhole anti-channeling temperature and pressure control device can also be cut off by reducing the pressure in the pressure chamber to cut off the oil and gas transmission.

[0050] In this solution, the downhole anti-channeling temperature and pressure control device can control the flow rate of oil and gas transportation through the ground pressure equipment, and can automatically shut down when the reservoir pressure is too high, thereby protecting other production equipment and providing guarantee for safe production.

[0051] In some embodiments, the width of the through hole 8 gradually increases from top to bottom, and the width of the liquid inlet hole 7 is greater than or equal to the maximum width of the through hole 8. The through hole 8 can be roughly formed into a triangle. As the sleeve valve 4 moves downward, the liquid inlet hole 7 and the through hole 8 begin to align, and the aligned area gradually increases, so that the flow through the liquid inlet hole 7 and the through hole 8 also increases accordingly. When the sleeve valve 4 reaches the lower limit position, the aligned area of ​​the liquid inlet hole 7 and the through hole 8 reaches the maximum, and the flow is the maximum. The pressure of the pressure chamber 11 is adjusted by a pressure device, so that the position of the sleeve valve 4 can be adjusted to achieve the adjustment of the flow.

[0052] In some embodiments, a sealing plug 9 is provided at the lower end of the central tube 5. The sealing plug 9 is generally plate-shaped and is sealed at the lower end of the central tube 5 to prevent fluid from entering through the lower end of the central tube 5. The reservoir fluid can only enter the central tube 5 through the through hole 8 and be transported upward from the upper end of the central tube 5.

[0053] In addition, the outer tube 3 is provided with a liquid outlet 6. The liquid outlet 6 allows the oil and gas in the pressure chamber 12 to pass through and be transported to the outside of the outer tube 3. In some embodiments, the outer tube 3 may be provided with a circle of liquid outlets 6 arranged at intervals in the circumferential direction.

[0054] In addition, the downhole anti-channeling temperature and pressure control device also includes an upper joint 1, which is partially inserted between the upper end of the outer tube 3 and the upper end of the central tube 5. The upper joint 1 can support the central tube 5 of the outer tube 3 so that the two are concentrically arranged to form an annulus. In addition, the upper joint 1 is also convenient for connection with the oil pipe, for example, a thread is formed on the outer periphery or inner periphery of the upper end thereof to achieve screw connection.

[0055] Furthermore, the upper joint 1 is provided with an air inlet channel 2 communicating with the compression chamber 11. Figure 1 As shown, an air inlet channel 2 is formed in the upper joint 1 , and the air inlet channel 2 can be connected to a pressure device, such as a pressure pump, through a pressure pipe, so that pressure can be pumped into the pressure chamber 11 through the pressure pump.

[0056] In addition, a sealing ring is provided between the outer circumference of the upper joint 1 and the inner circumference of the outer tube 3, and a sealing ring is provided between the inner circumference of the upper joint 1 and the outer circumference of the center tube 5. An annular groove may be formed on the outer circumference of the upper joint 1 or the inner circumference of the outer tube 3 to accommodate the sealing ring, so as to achieve a sealed joint between the upper joint 1 and the outer tube 3; similarly, an annular groove may be formed on the inner circumference of the upper joint 1 or the outer circumference of the center tube 5 to accommodate the sealing ring, so as to achieve a sealed joint between the upper joint 1 and the center tube 5. Multiple sealing rings may be provided axially spaced apart.

[0057] In some embodiments, the downhole anti-channeling temperature and pressure control device further comprises a lower joint 10 connected to the outer tube 3. A thread is formed on the outer periphery or inner periphery of the lower end of the lower joint 10 to facilitate the connection of the downhole anti-channeling temperature and pressure control device with other components, such as the one-way valve described below.

[0058] A sealing ring is provided between the outer circumference of the upper part of the sleeve valve 4 and the inner circumference of the outer tube 3, and a sealing ring is provided between the inner circumference of the lower part of the sleeve valve 4 and the outer circumference of the center tube 5. An annular groove is formed on the outer circumference of the upper part of the sleeve valve 4 to accommodate the sealing ring, so as to achieve a sealing engagement with the outer tube 3, and an annular groove is formed on the inner circumference of the lower part of the sleeve valve 4 to accommodate the sealing ring, so as to achieve a sealing engagement with the center tube 5. A plurality of sealing rings can be provided axially spaced apart.

[0059] In some embodiments, the upper and lower parts of the sleeve valve 4 are connected via a tapered pipe portion. Figure 1 As shown, the upper part and the lower part of the sleeve valve 4 are respectively formed as straight pipes, and the two can be connected by a tapered pipe to achieve the transition of the overall outer diameter and inner diameter.

[0060] Embodiment 3

[0061] The present solution provides a downhole anti-channeling temperature and pressure control device, comprising a center tube 5, an outer tube 3 sleeved on the center tube 5, and a tubular sleeve valve 4 arranged between the center tube 5 and the outer tube 3, the upper part of the sleeve valve 4 is fitted to the inner circumferential surface of the outer tube 3 so as to be spaced from the center tube 5 to form a pressure chamber 11, the lower part of the sleeve valve 4 is fitted to the outer circumferential surface of the center tube 5 so as to be spaced from the outer tube 3 to form a pressure chamber 12 connected to the lower end port of the outer tube 3, the lower part of the sleeve valve 4 is provided with a liquid inlet hole 7, and the center tube 5 is provided with a through hole 8, the downhole anti-channeling temperature and pressure control device can be configured to: pressurize the pressure chamber 11 to adjust the pressure difference between the pressure chamber 11 and the pressure chamber 12, so that the sleeve valve 4 moves axially relative to the center tube 5, so that the through hole 8 is aligned with or staggered from the liquid inlet hole 7.

[0062] refer to Figure 1As shown, an annulus is formed between the central pipe 5 and the outer pipe 3 , and the sleeve valve 4 is arranged in the annulus and can move axially under the action of pressure.

[0063] Among them, the sleeve valve 4 includes an upper part and a lower part, the upper part of which is spaced from the outer circumference of the center pipe 5 and fits with the inner circumference of the outer pipe 3 to form a pressure chamber, and the pressure chamber 11 is also roughly formed as an annulus; the pressure chamber 11 can be pressurized (gas or liquid is introduced) by ground pressure equipment to change the pressure therein; the lower part is fit with the outer circumference of the center pipe 5 and spaced from the inner circumference of the outer pipe 3 to form a pressure chamber 12, and the pressure chamber 12 can allow oil and gas in the reservoir to enter, that is, to withstand the pressure in the reservoir.

[0064] Under the action of the pressure difference between the pressure chamber 11 and the pressure chamber 12, the sleeve valve 4 can move axially, that is, when the pressure in the pressure chamber 11 is greater than the pressure in the pressure chamber 12, the sleeve valve 4 can be driven to move downward, and when the pressure in the pressure chamber 11 is less than the pressure in the pressure chamber 12, the sleeve valve 4 can be driven to move upward.

[0065] A through hole 8 is provided on the center tube 5, and a liquid inlet hole 7 is provided at the lower part of the sleeve valve 4. When the sleeve valve 4 moves axially to a position where the liquid inlet hole 7 and the through hole 8 are aligned with each other, the interior of the center tube 5 is communicated with the outer side of the sleeve valve 4 through the liquid inlet hole 7 and the through hole 8, that is, the center tube 5 is communicated with the pressure chamber 12, thereby allowing the oil and gas in the reservoir to enter the center tube 5 through the pressure chamber 12 and further be transported to the ground through the oil pipe; when the sleeve valve 4 moves axially so that the liquid inlet hole 7 and the through hole 8 are offset, the interior of the center tube 5 and the pressure chamber 12 are not communicated with each other, thereby prohibiting the oil and gas in the reservoir from being transported through the center tube 5.

[0066] In particular, the axial movement of the sleeve valve 4 can have an upper limit position (cannot move further upward) and a lower limit position (cannot move further downward). In the upper limit position, the liquid inlet hole 7 and the through hole 8 are staggered, and in the lower limit position, the liquid inlet hole 7 and the through hole 8 are aligned.

[0067] According to the pressure level in the reservoir, the pressure in the pressure chamber 11 can be controlled by a pressure device so that the pressure is at a predetermined value. When the pressure in the reservoir is less than the predetermined value, the sleeve valve 4 is moved downward to connect the liquid inlet hole 7 and the through hole 8, thereby allowing oil and gas to pass through the center pipe 5. When the pressure in the reservoir is higher than the predetermined value, the sleeve valve 4 is moved upward to disconnect the liquid inlet hole 7 and the through hole 8, thereby prohibiting oil and gas from passing through the center pipe 5.

[0068] Therefore, through the downhole anti-channeling temperature and pressure control device, when the reservoir pressure exceeds a predetermined value, for example, when gas channeling occurs, the downhole anti-channeling temperature and pressure control device can cut off the oil and gas transmission. Of course, in other cases, such as when the temperature is too high, the downhole anti-channeling temperature and pressure control device can also be cut off by reducing the pressure in the pressure chamber to cut off the oil and gas transmission.

[0069] In this solution, the downhole anti-channeling temperature and pressure control device can control the flow rate of oil and gas transportation through the ground pressure equipment, and can automatically shut down when the reservoir pressure is too high, thereby protecting other production equipment and providing guarantee for safe production.

[0070] In some embodiments, the width of the through hole 8 gradually increases from top to bottom, and the width of the liquid inlet hole 7 is greater than or equal to the maximum width of the through hole 8. The through hole 8 can be roughly formed into a triangle. As the sleeve valve 4 moves downward, the liquid inlet hole 7 and the through hole 8 begin to align, and the aligned area gradually increases, so that the flow through the liquid inlet hole 7 and the through hole 8 also increases accordingly. When the sleeve valve 4 reaches the lower limit position, the aligned area of ​​the liquid inlet hole 7 and the through hole 8 reaches the maximum, and the flow is the maximum. The pressure of the pressure chamber 11 is adjusted by a pressure device, so that the position of the sleeve valve 4 can be adjusted to achieve the adjustment of the flow.

[0071] In some embodiments, a sealing plug 9 is provided at the lower end of the central tube 5. The sealing plug 9 is generally plate-shaped and is sealed at the lower end of the central tube 5 to prevent fluid from entering through the lower end of the central tube 5. The reservoir fluid can only enter the central tube 5 through the through hole 8 and be transported upward from the upper end of the central tube 5.

[0072] In addition, the outer tube 3 is provided with a liquid outlet hole 6. The liquid outlet hole 6 allows the oil and gas in the pressure chamber 12 to pass through and be transported to the outside of the outer tube 3. In some embodiments, three circles of axially spaced liquid outlet holes 6 may be provided on the outer tube 3, each circle including a plurality of circumferentially spaced liquid outlet holes 6.

[0073] In addition, the downhole anti-channeling temperature and pressure control device also includes an upper joint 1, which is partially inserted between the upper end of the outer tube 3 and the upper end of the central tube 5. The upper joint 1 can support the central tube 5 of the outer tube 3 so that the two are concentrically arranged to form an annulus. In addition, the upper joint 1 is also convenient for connection with the oil pipe, for example, a thread is formed on the outer periphery or inner periphery of the upper end thereof to achieve screw connection.

[0074] Furthermore, the upper joint 1 is provided with an air inlet channel 2 communicating with the compression chamber 11. Figure 1 As shown, an air inlet channel 2 is formed in the upper joint 1 , and the air inlet channel 2 can be connected to a pressure device, such as a pressure pump, through a pressure pipe, so that pressure can be pumped into the pressure chamber 11 through the pressure pump.

[0075] In addition, a sealing ring is provided between the outer circumference of the upper joint 1 and the inner circumference of the outer tube 3, and a sealing ring is provided between the inner circumference of the upper joint 1 and the outer circumference of the center tube 5. An annular groove may be formed on the outer circumference of the upper joint 1 or the inner circumference of the outer tube 3 to accommodate the sealing ring, so as to achieve a sealed joint between the upper joint 1 and the outer tube 3; similarly, an annular groove may be formed on the inner circumference of the upper joint 1 or the outer circumference of the center tube 5 to accommodate the sealing ring, so as to achieve a sealed joint between the upper joint 1 and the center tube 5. Multiple sealing rings may be provided axially spaced apart.

[0076] In some embodiments, the downhole anti-channeling temperature and pressure control device further comprises a lower joint 10 connected to the outer tube 3. A thread is formed on the outer periphery or inner periphery of the lower end of the lower joint 10 to facilitate the connection of the downhole anti-channeling temperature and pressure control device with other components, such as the one-way valve described below.

[0077] A sealing ring is provided between the outer circumference of the upper part of the sleeve valve 4 and the inner circumference of the outer tube 3, and a sealing ring is provided between the inner circumference of the lower part of the sleeve valve 4 and the outer circumference of the center tube 5. An annular groove is formed on the outer circumference of the upper part of the sleeve valve 4 to accommodate the sealing ring, so as to achieve a sealing engagement with the outer tube 3, and an annular groove is formed on the inner circumference of the lower part of the sleeve valve 4 to accommodate the sealing ring, so as to achieve a sealing engagement with the center tube 5. A plurality of sealing rings can be provided axially spaced apart.

[0078] In some embodiments, the upper and lower parts of the sleeve valve 4 are connected via a tapered pipe portion. Figure 1 As shown, the upper part and the lower part of the sleeve valve 4 are respectively formed as straight pipes, and the two can be connected by a tapered pipe to achieve the transition of the overall outer diameter and inner diameter.

[0079] Embodiment 2

[0080] The present solution provides a downhole anti-channeling temperature and pressure control device, comprising a center tube 5, an outer tube 3 sleeved on the center tube 5, and a tubular sleeve valve 4 arranged between the center tube 5 and the outer tube 3, the upper part of the sleeve valve 4 is fitted to the inner circumferential surface of the outer tube 3 so as to be spaced from the center tube 5 to form a pressure chamber 11, the lower part of the sleeve valve 4 is fitted to the outer circumferential surface of the center tube 5 so as to be spaced from the outer tube 3 to form a pressure chamber 12 connected to the lower end port of the outer tube 3, the lower part of the sleeve valve 4 is provided with a liquid inlet hole 7, and the center tube 5 is provided with a through hole 8, the downhole anti-channeling temperature and pressure control device can be configured to: pressurize the pressure chamber 11 to adjust the pressure difference between the pressure chamber 11 and the pressure chamber 12, so that the sleeve valve 4 moves axially relative to the center tube 5, so that the through hole 8 is aligned with or staggered from the liquid inlet hole 7.

[0081] refer to Figure 1As shown, an annulus is formed between the central pipe 5 and the outer pipe 3 , and the sleeve valve 4 is arranged in the annulus and can move axially under the action of pressure.

[0082] Among them, the sleeve valve 4 includes an upper part and a lower part, the upper part of which is spaced from the outer circumference of the center pipe 5 and fits with the inner circumference of the outer pipe 3 to form a pressure chamber, and the pressure chamber 11 is also roughly formed as an annulus; the pressure chamber 11 can be pressurized (gas or liquid is introduced) by ground pressure equipment to change the pressure therein; the lower part is fit with the outer circumference of the center pipe 5 and spaced from the inner circumference of the outer pipe 3 to form a pressure chamber 12, and the pressure chamber 12 can allow oil and gas in the reservoir to enter, that is, to withstand the pressure in the reservoir.

[0083] Under the action of the pressure difference between the pressure chamber 11 and the pressure chamber 12, the sleeve valve 4 can move axially, that is, when the pressure in the pressure chamber 11 is greater than the pressure in the pressure chamber 12, the sleeve valve 4 can be driven to move downward, and when the pressure in the pressure chamber 11 is less than the pressure in the pressure chamber 12, the sleeve valve 4 can be driven to move upward.

[0084] A through hole 8 is provided on the center tube 5, and a liquid inlet hole 7 is provided at the lower part of the sleeve valve 4. When the sleeve valve 4 moves axially to a position where the liquid inlet hole 7 and the through hole 8 are aligned with each other, the interior of the center tube 5 is communicated with the outer side of the sleeve valve 4 through the liquid inlet hole 7 and the through hole 8, that is, the center tube 5 is communicated with the pressure chamber 12, thereby allowing the oil and gas in the reservoir to enter the center tube 5 through the pressure chamber 12 and further be transported to the ground through the oil pipe; when the sleeve valve 4 moves axially so that the liquid inlet hole 7 and the through hole 8 are offset, the interior of the center tube 5 and the pressure chamber 12 are not communicated with each other, thereby prohibiting the oil and gas in the reservoir from being transported through the center tube 5.

[0085] In particular, the axial movement of the sleeve valve 4 can have an upper limit position (cannot move further upward) and a lower limit position (cannot move further downward). In the upper limit position, the liquid inlet hole 7 and the through hole 8 are staggered, and in the lower limit position, the liquid inlet hole 7 and the through hole 8 are aligned.

[0086] According to the pressure level in the reservoir, the pressure in the pressure chamber 11 can be controlled by a pressure device so that the pressure is at a predetermined value. When the pressure in the reservoir is less than the predetermined value, the sleeve valve 4 is moved downward to connect the liquid inlet hole 7 and the through hole 8, thereby allowing oil and gas to pass through the center pipe 5. When the pressure in the reservoir is higher than the predetermined value, the sleeve valve 4 is moved upward to disconnect the liquid inlet hole 7 and the through hole 8, thereby prohibiting oil and gas from passing through the center pipe 5.

[0087] Therefore, through the downhole anti-channeling temperature and pressure control device, when the reservoir pressure exceeds a predetermined value, for example, when gas channeling occurs, the downhole anti-channeling temperature and pressure control device can cut off the oil and gas transmission. Of course, in other cases, such as when the temperature is too high, the downhole anti-channeling temperature and pressure control device can also be cut off by reducing the pressure in the pressure chamber to cut off the oil and gas transmission.

[0088] In this solution, the downhole anti-channeling temperature and pressure control device can control the flow rate of oil and gas transportation through the ground pressure equipment, and can automatically shut down when the reservoir pressure is too high, thereby protecting other production equipment and providing guarantee for safe production.

[0089] In some embodiments, the width of the through hole 8 gradually increases from top to bottom, and the width of the liquid inlet hole 7 is greater than or equal to the maximum width of the through hole 8. The through hole 8 can be roughly formed into a triangle. As the sleeve valve 4 moves downward, the liquid inlet hole 7 and the through hole 8 begin to align, and the aligned area gradually increases, so that the flow through the liquid inlet hole 7 and the through hole 8 also increases accordingly. When the sleeve valve 4 reaches the lower limit position, the aligned area of ​​the liquid inlet hole 7 and the through hole 8 reaches the maximum, and the flow is the maximum. The pressure of the pressure chamber 11 is adjusted by a pressure device, so that the position of the sleeve valve 4 can be adjusted to achieve the adjustment of the flow.

[0090] In some embodiments, a sealing plug 9 is provided at the lower end of the central tube 5. The sealing plug 9 is generally plate-shaped and is sealed at the lower end of the central tube 5 to prevent fluid from entering through the lower end of the central tube 5. The reservoir fluid can only enter the central tube 5 through the through hole 8 and be transported upward from the upper end of the central tube 5.

[0091] In addition, the outer tube 3 is provided with a liquid outlet hole 6. The liquid outlet hole 6 allows the oil and gas in the pressure chamber 12 to pass through and be transported to the outside of the outer tube 3. In some embodiments, the outer tube 3 may be provided with two circles of axially spaced liquid outlet holes 6, each circle including a plurality of circumferentially spaced liquid outlet holes 6.

[0092] In addition, the downhole anti-channeling temperature and pressure control device also includes an upper joint 1, which is partially inserted between the upper end of the outer tube 3 and the upper end of the central tube 5. The upper joint 1 can support the central tube 5 of the outer tube 3 so that the two are concentrically arranged to form an annulus. In addition, the upper joint 1 is also convenient for connection with the oil pipe, for example, a thread is formed on the outer periphery or inner periphery of the upper end thereof to achieve screw connection.

[0093] Furthermore, the upper joint 1 is provided with an air inlet channel 2 communicating with the compression chamber 11. Figure 1 As shown, an air inlet channel 2 is formed in the upper joint 1 , and the air inlet channel 2 can be connected to a pressure device, such as a pressure pump, through a pressure pipe, so that pressure can be pumped into the pressure chamber 11 through the pressure pump.

[0094] In addition, a sealing ring is provided between the outer circumference of the upper joint 1 and the inner circumference of the outer tube 3, and a sealing ring is provided between the inner circumference of the upper joint 1 and the outer circumference of the center tube 5. An annular groove may be formed on the outer circumference of the upper joint 1 or the inner circumference of the outer tube 3 to accommodate the sealing ring, so as to achieve a sealed joint between the upper joint 1 and the outer tube 3; similarly, an annular groove may be formed on the inner circumference of the upper joint 1 or the outer circumference of the center tube 5 to accommodate the sealing ring, so as to achieve a sealed joint between the upper joint 1 and the center tube 5. Multiple sealing rings may be provided axially spaced apart.

[0095] In some embodiments, the downhole anti-channeling temperature and pressure control device further comprises a lower joint 10 connected to the outer tube 3. A thread is formed on the outer periphery or inner periphery of the lower end of the lower joint 10 to facilitate the connection of the downhole anti-channeling temperature and pressure control device with other components, such as the one-way valve described below.

[0096] A sealing ring is provided between the outer circumference of the upper part of the sleeve valve 4 and the inner circumference of the outer tube 3, and a sealing ring is provided between the inner circumference of the lower part of the sleeve valve 4 and the outer circumference of the center tube 5. An annular groove is formed on the outer circumference of the upper part of the sleeve valve 4 to accommodate the sealing ring, so as to achieve a sealing engagement with the outer tube 3, and an annular groove is formed on the inner circumference of the lower part of the sleeve valve 4 to accommodate the sealing ring, so as to achieve a sealing engagement with the center tube 5. A plurality of sealing rings can be provided axially spaced apart.

[0097] In some embodiments, the upper and lower parts of the sleeve valve 4 are connected via a tapered pipe portion. Figure 1 As shown, the upper part and the lower part of the sleeve valve 4 are respectively formed as straight pipes, and the two can be connected by a tapered pipe to achieve the transition of the overall outer diameter and inner diameter.

[0098] On the other hand, this solution provides an air injection anti-channeling temperature and pressure control integrated string, including a tubing 19, a downhole anti-channeling temperature and pressure control device as described in the above solution, a pressure control pump 20, and a rod pump 18. The downhole anti-channeling temperature and pressure control device 13 is connected to the lower end of the tubing 19, the pressure control pump 20 is connected to the pressure chamber 11 through a pressure pipe 27, and the rod pump 18 is arranged in the tubing 19. Figure 2 As shown, the lower end of the oil pipe 19 is connected to the downhole anti-channeling temperature and pressure control device 13, and the pressure control pump 20 passes fluid into the pressure chamber 11 through the pressure pipe 27 to adjust the pressure in the pressure chamber 11, thereby realizing the control of oil and gas transportation, and the rod pump 18 can provide power for oil and gas transportation.

[0099] In addition, the lower end of the downhole anti-channeling temperature and pressure control device 13 is connected to a one-way valve 15, and a packer 14 is arranged on the one-way valve 15. The one-way valve 15 only allows oil and gas to flow upward, and prohibits oil and gas from flowing downward. The one-way valve 15 is sealed in the casing through the packer 14, so that the one-way valve 15, the downhole anti-channeling temperature and pressure control device 13 and the oil pipe 19 remain stable.

[0100] In addition, the air injection anti-channeling temperature and pressure control integrated string also includes a thermocouple 16 and a control element 21 thermally coupled to the downhole anti-channeling temperature and pressure control device 13, and the thermocouple 16 and the pressure control pump 20 are in communication connection with the control element 21. The thermocouple 16 can monitor the temperature near the downhole anti-channeling temperature and pressure control device 13, that is, monitor the temperature of the reservoir oil and gas, and transmit a signal to the ground control element 21 through a cable. The control element 21 can selectively control the downhole anti-channeling temperature and pressure control device 13 to disconnect and connect according to the temperature information, that is, control the downhole anti-channeling temperature and pressure control device 13 by controlling the pressure of the pressure control pump 20.

[0101] In addition, the air injection anti-channeling temperature and pressure control integrated pipe string also includes an air anchor 17 arranged in the oil pipe 19 and located at the lower side of the rod pump 18. The air anchor 17 can separate part of the gas before the oil and gas enter the rod pump 18, reduce the impact of the gas on the rod pump 18, and improve work efficiency.

[0102] In addition, the air injection anti-channeling temperature and pressure control integrated string also includes a gas-liquid separation device 22 connected to the oil pipe 19, a gas pipeline 23 and a liquid pipeline 24 connected to the gas-liquid separation device 22, a flow meter 25 arranged on the gas-liquid separation device 22, and a liquid metering device 26 arranged on the liquid pipeline 24. The gas-liquid separation device 22 can further separate gas and liquid, the flow meter 25 can monitor the flow rate of gas, and the liquid metering device 26 can monitor parameters such as the flow rate of liquid.

[0103] The integrated string for air injection, anti-channeling, temperature control and pressure control can be operated as follows:

[0104] (1) Shut down the well and give an alarm: When the temperature measured by the downhole thermocouple is higher than the formation temperature by 100°C, or the oxygen content in the wellhead gas is higher than 5%, or the gas-liquid ratio at the wellhead is higher than 3000m 3 / m 3When the H2S content in the wellhead gas is greater than 30ppm, or when one or more of the above occurs at the same time, the well will be shut in. The wellhead automatic pressure control pump adjusts the pressure by moving the plunger back and forth. When shutting in the well, the plunger will be quickly retracted to the maximum position to reduce the wellhead pressure. At this time, the sleeve valve of the downhole anti-channeling temperature and pressure control device moves upward under the action of the bottom hole pressure, and the liquid inlet hole and the through hole are staggered to achieve well shut-in. In addition, when one or more of the above situations occur, the control element can sound an alarm to prompt the staff to perform other related operations.

[0105] (2) Controlling bottom hole pressure during production

[0106] You can choose to control the bottom hole flow pressure for production. The pressure of the pressure control pump plus the pressure of the liquid column in the pressure pipe is approximately the bottom hole pressure. After setting the bottom hole pressure value and the acceptable error pressure value in the control cabinet (control element), the wellhead pressure can be controlled by adjusting the plunger position of the pressure control pump (plunger pump). The plunger position is infinitely regulated by the thread amount, thereby achieving the control of bottom hole flow pressure production. If you want to increase the bottom hole flow pressure, you can recover the plunger through the plunger pump, and then move the sleeve valve upward through the action of the bottom hole pressure, reduce the amount of liquid inflow, and increase the bottom hole pressure. If you want to reduce the bottom hole pressure, the process is the opposite.

[0107] The adjustment process is divided into two cases, taking the set pressure value and the error value of ±0.5Mpa as an example:

[0108] The pressure value is lower than the set pressure:

[0109] ① The system automatically recycles the plunger to 1 / 2 of the remaining amount of the plunger, that is, reduce the pump pressure to reduce the cross-sectional area of ​​the through hole and the liquid inlet, reduce the amount of liquid inlet, and wait for the pressure to rise. When the pressure stabilizes, if it is less than the set pressure -0.5Mpa, continue to repeat the remaining steps; ② When the pressure rises to greater than the set pressure +0.5MPa, the control element pushes the plunger to 1 / 2 of the last change of the plunger, that is, increase the pump pressure, increase the cross-sectional area of ​​the through hole and the liquid inlet, increase the amount of liquid inlet, and continue to observe Pressure changes. If the pressure is still greater than the set pressure + 0.5Mpa after it stabilizes, continue to execute the steps; ③ If the pressure drops to less than the set pressure - 0.5Mpa, the amount of the recovered plunger is 1 / 2 of the last change, and the pressure is waited for to rise. If the pressure is still less than the set pressure - 0.5Mpa after it stabilizes, continue to repeat the remaining steps until the pressure stabilizes at the set pressure ± 0.5Mpa; ④ When the pressure in any of the above steps stabilizes at the set value ± 0.5Mpa, stop adjusting.

[0110] Pressure higher than set pressure:

[0111] ① First, the system automatically pushes out the plunger until 1 / 2 of the remaining amount of the plunger is pushed out, that is, the pump pressure is increased to increase the cross-sectional area of ​​the through hole aligned with the liquid inlet, increase the amount of liquid inlet, and wait for the pressure to drop. When the pressure stabilizes, if it is greater than the set pressure + 0.5Mpa value, continue to repeat the remaining steps; ② When the pressure drops to less than the set pressure - 0.5MPa value, the system recycles the plunger to 1 / 2 of the last plunger change, that is, reduce the pump pressure, reduce the cross-sectional area of ​​the through hole aligned with the liquid inlet, and reduce the amount of liquid inlet. Continue to observe the pressure changes. If the pressure is still less than the set pressure - 0.5Mpa after it stabilizes, continue to execute the steps; ③ If the pressure rises to the set pressure + 0.5Mpa, push out the plunger by 1 / 2 of the last change, wait for the pressure to drop, and if it is still greater than the set pressure + 0.5Mpa after it stabilizes, continue to repeat the remaining steps until the pressure stabilizes at the set value pressure ± 0.5Mpa; ④ When the pressure in any of the above steps stabilizes at the set value ± 0.5Mpa, stop adjusting.

[0112] After the pressure adjustment is completed, the pressure error value can be increased, the number of adjustments can be reduced, and the life of the equipment can be extended.

[0113] By controlling the wellhead pressure, the advance speed of the underground thermal oxidation front can be adjusted to make the air hot mixed phase drive expand more evenly underground. If the gas-liquid ratio is too high, the bottom hole flow pressure can be increased to reduce the advance speed in the well direction. If the underground temperature increases quickly, it means that the oxidation front has the risk of advancing. The expansion speed of the thermal oxidation front can also be controlled by increasing the bottom hole flow pressure.

[0114] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. An underground anti-channeling temperature and pressure control device, characterized in that: The invention comprises a central tube (5), an outer tube (3) sleeved on the central tube (5), and a tubular sleeve valve (4) arranged between the central tube (5) and the outer tube (3); the upper part of the sleeve valve (4) is in contact with the inner circumference of the outer tube (3) so as to be spaced from the central tube (5) to form a pressure chamber (11); the lower part of the sleeve valve (4) is in contact with the outer circumference of the central tube (5) so as to be spaced from the outer tube (3) to form a pressure chamber (11) with the lower end of the outer tube (3). The sleeve valve (4) is provided with a liquid inlet hole (7) at the lower part, and the central tube (5) is provided with a through hole (8). The downhole anti-channeling temperature and pressure control device can be configured to: pressurize the pressure chamber (11) to adjust the pressure difference between the pressure chamber (11) and the pressure chamber (12), so that the sleeve valve (4) moves axially relative to the central tube (5), so that the through hole (8) is aligned with or staggered from the liquid inlet hole (7).

2. The underground anti-channeling temperature and pressure control device according to claim 1, characterized in that: The width of the through hole (8) gradually increases from top to bottom, and the width of the liquid inlet hole (7) is greater than or equal to the maximum width of the through hole (8).

3. The underground anti-channeling temperature and pressure control device according to claim 1, characterized in that: A sealing plug (9) is provided at the lower end of the central tube (5).

4. The underground anti-channeling temperature and pressure control device according to claim 1, characterized in that: The outer tube (3) is provided with a liquid outlet hole (6).

5. The underground anti-channeling temperature and pressure control device according to claim 1, characterized in that: It also comprises an upper joint (1), which is partially inserted between the upper end of the outer tube (3) and the upper end of the central tube (5).

6. The underground anti-channeling temperature and pressure control device according to claim 5, characterized in that: The upper joint (1) is provided with an air inlet passage (2) which is in communication with the compression chamber (11).

7. The underground anti-channeling temperature and pressure control device according to claim 6, characterized in that: A sealing ring is provided between the outer circumference of the upper joint (1) and the inner circumference of the outer tube (3), and a sealing ring is provided between the inner circumference of the upper joint (1) and the outer circumference of the central tube (5).

8. The underground anti-channeling temperature and pressure control device according to claim 1, characterized in that: It also includes a lower joint (10) connected to the outer tube (3).

9. The underground anti-channeling temperature and pressure control device according to claim 1, characterized in that: A sealing ring is provided between the outer circumference of the upper part of the sleeve valve (4) and the inner circumference of the outer tube (3), and a sealing ring is provided between the inner circumference of the lower part of the sleeve valve (4) and the outer circumference of the center tube (5).

10. The underground anti-channeling temperature and pressure control device according to claim 1, characterized in that: The upper part and the lower part of the sleeve valve (4) are connected via a tapered pipe part.

11. An air injection anti-channeling temperature and pressure control integrated pipe string, characterized in that: It comprises an oil pipe (19), a downhole temperature and pressure control device for preventing cross-flow as described in any one of claims 1 to 10, a pressure control pump (20), and a rod pump (18), wherein the downhole temperature and pressure control device for preventing cross-flow (13) is connected to the lower end of the oil pipe (19), the pressure control pump (20) is connected to the pressure chamber (11) through a pressure pipe (27), and the rod pump (18) is arranged in the oil pipe (19).

12. The air injection anti-channeling temperature and pressure control integrated pipe string according to claim 11, characterized in that: The lower end of the underground anti-channeling temperature and pressure control device (13) is connected to a one-way valve (15), and a packer (14) is arranged on the one-way valve (15).

13. The air injection anti-channeling temperature and pressure control integrated pipe string according to claim 11, characterized in that: It also includes a thermocouple (16) thermally coupled to the downhole anti-channeling temperature and pressure control device (13) and a control element (21), wherein the thermocouple (16) and the pressure control pump (20) are communicatively connected with the control element (21).

14. The air injection anti-channeling temperature and pressure control integrated pipe string according to claim 11, characterized in that: It also includes an air anchor (17) which is arranged in the oil pipe (19) and located at the lower side of the rod pump (18).

15. The air injection anti-channeling temperature and pressure control integrated pipe string according to claim 11, characterized in that: It also includes a gas-liquid separation device (22) connected to the oil pipe (19), a gas pipeline (23) and a liquid pipeline (24) connected to the gas-liquid separation device (22), a flow meter (25) arranged on the gas-liquid separation device (22), and a liquid metering device (26) arranged on the liquid pipeline (24).

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