Bottom water coning restraining device and method

Abstract

The invention discloses a bottom water coning restraining device and method.The device comprises a self-injection and self-production well, a piston, a first valve and a second valve, a sealing cavity is formed in the self-injection and self-production well, and a first perforation communicated with a bottom water area and a second perforation communicated with an oil layer are formed in the sealing cavity; the piston is arranged in the sealing cavity in a sliding manner; the first valve is arranged in the first perforation; and the second valve is arranged in the second perforation. When the piston moves upwards, the first valve is opened, the second valve is closed, and bottom water in the bottom water area is swabbed into the sealing cavity through the first perforation; the piston moves downwards, the first valve is closed, the second valve is opened, bottom water in the sealing cavity is injected into an oil layer through the second perforation hole, the pressure of the oil layer and the pressure of a bottom water area are balanced, and upward coning of the bottom water caused by the fact that the pressure of the oil layer is lower than the pressure of the bottom water area is prevented. Bottom water is located at the bottom of the oil layer after entering the oil layer and can displace crude oil at the bottom of the oil layer to facilitate exploitation.

Description

Technical Field

[0001] The present application belongs to the technical field of crude oil extraction, and specifically relates to a bottom water coning suppression device and method. Background Art

[0002] The exploitation of heavy oil reservoirs is mainly based on steam stimulation technology, steam flooding technology, SAGD technology and fire oil layer burning technology. After the heavy oil reservoirs have gone through conventional oil production, steam stimulation and other oil production stages, the formation is preheated and the pressure drops, which creates favorable conditions for steam flooding technology. At this time, it is easier to obtain higher economic benefits by using steam flooding for oil production. Steam flooding technology is a development method that continuously injects steam from the injection well according to a certain injection and production well network, drives crude oil to the surrounding production wells, and produces oil through the production wells. For heavy oil reservoirs with bottom water, during the steam flooding process, since the production wells produce oil from the lower part of the oil layer, the formation pressure gradually increases from the bottom of the well along the radial distance to the supply boundary. As the crude oil around the production wells is continuously produced, the oil layer pressure at the production wells is lower than the bottom water pressure. Under the action of the oil and water pressure difference, the bottom water will cone into the upper oil layer, forming a water cone in the shape of a mountain peak, which seriously affects the steam drive development effect. The production wells will not be able to produce normally, or the production is too low to bring economic benefits.

[0003] The existing method for solving the bottom water coning problem is generally to increase the perforation section of the production well and increase the distance between the production well section and the bottom water to delay the bottom water coning. However, the above method can only delay the progress of the bottom water coning, which is less effective for heavy oil reservoirs, because heavy oil has high viscosity and poor fluidity. Once water appears in the production well, the water content rises rapidly and the oil production decreases rapidly. In addition, increasing the perforation section will make it impossible to develop the crude oil at the bottom of the oil layer. Summary of the invention

[0004] In order to solve the technical problems in the prior art that raising the perforation section of a production well can only delay the bottom water coning, once water appears in the production well, the water cut rises rapidly, the oil production decreases rapidly, and raising the perforation section will make it impossible to develop the crude oil at the bottom of the oil layer, the present application provides a bottom water coning suppression device and method.

[0005] In a first aspect, the present application provides a bottom water coning suppression device, comprising:

[0006] A self-injection and self-production well, wherein a sealed chamber is provided inside and extends to the bottom water zone and the oil layer respectively, wherein the sealed chamber is provided with a first perforation connected to the bottom water zone and a second perforation connected to the oil layer respectively;

[0007] A piston is slidably disposed in the sealed chamber;

[0008] a first valve, disposed in the first perforation;

[0009] a second valve, disposed in the second perforation;

[0010] When the piston moves upward, under the action of pressure, the first valve opens and the second valve closes, and the bottom water in the bottom water zone is pumped into the sealed chamber through the first perforation; when the piston moves downward, under the action of pressure, the first valve closes and the second valve opens, and the bottom water in the sealed chamber is injected into the oil layer through the second perforation.

[0011] In some embodiments, the self-injection and self-production well comprises:

[0012] An injection and production wellbore, with two ends extending to the bottom water zone and the oil layer respectively, the bottom of the injection and production wellbore is sealed, and the first perforation and the second perforation are arranged on the inner wall of the injection and production wellbore;

[0013] The lubrication wellbore is sealed at the top and sealed at the bottom with the top of the injection and production wellbore. The piston is arranged in the lubrication wellbore to form a sealed chamber with the injection and production wellbore.

[0014] In some embodiments, the piston includes a piston body and a piston rod, the piston body is disposed in the lubrication wellbore; one end of the piston rod is connected to the piston body, and the other end extends out of the lubrication wellbore, for driving the piston body to move under the action of a driving force.

[0015] In some embodiments, a combined well network is also included, which includes steam injection horizontal wells and production vertical wells. The steam injection horizontal wells are used to inject steam into the oil layer to form a steam chamber and replenish the pressure of the oil layer. The production vertical wells are provided with third perforations at the bottom of the steam chamber.

[0016] In some embodiments, the bottom of the production vertical well is set in the bottom water zone, and a fourth perforation is set in the bottom water zone near the oil-water interface. The fourth perforation is used to inject a water plugging agent into the bottom water of the bottom water zone to form an artificial water layer baffle in the bottom water zone near the oil-water interface.

[0017] In some embodiments, the production horizontal well is also used to inject a thickener or viscosifier into the oil layer between the steam chamber and the oil-water interface to thicken the crude oil and form an artificial baffle in the oil layer near the oil-water interface.

[0018] In some embodiments, a cement filling layer is further included, wherein the cement filling layer is located between the third perforation and the oil layer artificial partition.

[0019] In a second aspect, the present application provides a bottom water coning suppression method, using the bottom water coning suppression device, comprising:

[0020] In response to a pumping instruction, the piston is controlled to move upward, so that the first valve is opened and the second valve is closed, and the bottom water in the bottom water zone is pumped into the sealed chamber through the first perforation;

[0021] In response to an injection instruction, the piston is controlled to move downward, so that the first valve is closed and the second valve is opened, and the bottom water in the sealed chamber is injected into the oil layer through the second perforations.

[0022] In some embodiments, it also includes: injecting steam into the oil layer through the steam injection horizontal well of the bottom water coning suppression device to form a steam chamber and replenish the pressure of the oil layer; and producing oil through a third perforation set at the bottom of the steam chamber by the production vertical well.

[0023] In some embodiments, the method further includes: injecting a water plugging agent into the bottom water through a fourth perforation of the bottom water coning suppression device to form an artificial water layer baffle at a position near the oil-water interface in the bottom water area.

[0024] In some embodiments, the method further includes: injecting a thickener or a thickening agent into the oil layer between the steam chamber and the oil-water interface through a horizontal production well to thicken the crude oil, so as to form an artificial baffle in the oil layer near the oil-water interface.

[0025] In some embodiments, the method further includes: filling cement in a region between the third perforation and the oil layer artificial baffle to form a cement filling layer to isolate the oil layer artificial baffle from the oil layer.

[0026] A bottom water coning suppression device provided according to one or more embodiments of the present application has the following advantages compared with the prior art: Beneficial effects:

[0027] When the piston moves upward, under the action of pressure, the first valve opens and the second valve closes, and the bottom water in the bottom water zone is pumped into the sealed chamber through the first perforation; when the piston moves downward, under the action of pressure, the first valve closes and the second valve opens, and the bottom water in the sealed chamber is injected into the oil layer through the second perforation, so that the bottom water in the bottom water zone is pumped into the oil layer, so that the oil layer pressure is balanced with the pressure in the bottom water zone, and the bottom water is prevented from cone-shaped upward due to the oil layer pressure being lower than the bottom water zone pressure; at the same time, there is no need to raise the perforation section, and the bottom crude oil can still be mined, and the bottom water is distributed at the bottom of the oil layer after entering the oil layer, so that the crude oil at the bottom of the oil layer can be displaced upward for easy mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of a bottom water coning suppression device according to an embodiment of the present invention is shown;

[0029] Figure 2A schematic structural diagram of a self-injection and self-production well and related structures in a bottom water coning suppression device according to an embodiment of the present invention is shown;

[0030] Figure 3 A schematic diagram of the structure of a combined well pattern in a bottom water coning suppression device according to an embodiment of the present invention is shown from a top view;

[0031] Figure 4 A schematic structural diagram of a combined well pattern in a bottom water coning suppression device according to an embodiment of the present invention is shown;

[0032] Figure 5 A schematic flow chart of a bottom water coning suppression method in an embodiment of the present invention is shown.

[0033] The corresponding marks in the above figures are: 1-production vertical well; 2-steam injection horizontal well; 3-self-injection and self-production well, 31-sealed chamber, 32-first perforation, 33-second perforation, 34-injection and production wellbore, 35-lubricating wellbore; 4-oil-water interface; 5-bottom water area; 6-oil layer; 7-water layer artificial baffle; 8-oil layer artificial baffle; 9-third perforation; 10-fourth perforation; 11-steam chamber; 12-piston, 121-piston body, 122-piston rod; 13-first valve; 14-second valve. DETAILED DESCRIPTION

[0034] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0035] In a first aspect of an embodiment of the present application, a bottom water coning suppression device is provided. Figure 1-Figure 4 As shown, it includes a self-injection and self-production well 3, a piston 12, a first valve 13 and a second valve 14; a sealed chamber 31 is provided inside the self-injection and self-production well 3, which extends to the bottom water area 5 and the oil layer 6 respectively, and the sealed chamber 31 is respectively provided with a first perforation 32 connected to the bottom water area 5 and a second perforation 33 connected to the oil layer 6; the piston 12 is slidably arranged in the sealed chamber 31, and the pressure change of the sealed chamber 31 is achieved by sliding the piston 12, thereby changing the flow direction of the liquid; the first valve 13 is arranged in the first perforation 32, and only allows the fluid to flow from the bottom water area 5 to the sealed chamber 31; the second valve 14 is arranged in the second perforation 33, and only allows the fluid to flow from the sealed chamber 31 to the oil layer 6.

[0036] The first valve 13 and the second valve 14 are one-way valves, which only allow the medium to flow in one direction and prevent it from flowing in the opposite direction. The working principle of the one-way valve is that the valve flap opens under the pressure of the fluid flowing in one direction; when the fluid flows in the opposite direction, the fluid pressure and the self-recognition of the valve flap act on the valve seat, thereby cutting off the flow of the fluid.

[0037] The bottom water cone advancement suppression device provided by the embodiment of the present application is as follows: when the piston 12 moves upward, under the action of pressure, the first valve 13 is opened and the second valve 14 is closed, and the bottom water in the bottom water area 5 is pumped into the sealed chamber 31 through the first perforation 32; when the piston 12 moves downward, under the action of pressure, the first valve 13 is closed and the second valve 14 is opened, and the bottom water in the sealed chamber 31 is injected into the oil layer 6 through the second perforation 33, so that the bottom water in the bottom water area 5 is pumped into the oil layer 6, so that the pressure of the oil layer 6 is balanced with the pressure of the bottom water area 5, and the bottom water cone advancement upward caused by the pressure of the oil layer 6 being lower than the pressure of the bottom water area 5 is prevented; at the same time, there is no need to raise the perforation section, and the bottom crude oil can still be mined, and after the bottom water enters the oil layer 6, it is distributed at the bottom of the oil layer 6, and the crude oil at the bottom of the oil layer 6 can be displaced upward for easy mining.

[0038] In some embodiments, the self-injection and self-production well 3 includes an injection and production wellbore 34 and a lubrication wellbore 35. The two ends of the injection and production wellbore 34 extend to the bottom water area 5 and the oil layer 6 respectively. The bottom of the injection and production wellbore 34 is sealed, and the first perforation 32 and the second perforation 33 are arranged on the inner wall of the injection and production wellbore 34. The top of the lubrication wellbore 35 is sealed, and the bottom is sealed and connected to the top of the injection and production wellbore 34. The piston 12 is arranged in the lubrication wellbore 35 to form a sealed chamber 31 between the injection and production wellbore 34. By sealingly connecting the lubrication wellbore 35 with the bottom and the top of the injection and production wellbore 34, the length of the sealed chamber 31 can be extended, so that the movable distance of the piston 12 is farther, which is convenient for adjusting the collection and discharge volume of the bottom water, so that the pressure can be adjusted as needed to quickly balance the pressure of the bottom water area 5 and the oil layer 6, and the adjustable pressure range and speed adjustment range are larger, and the applicability is better.

[0039] In some embodiments, the piston 12 includes a piston body 121 and a piston rod 122. The piston body 121 is disposed in the lubricating wellbore 35. One end of the piston rod 122 is connected to the piston body 121, and the other end extends out of the lubricating wellbore 35, and is used to drive the piston body 121 to move under the action of a driving force. One end of the piston rod 122 is connected to the piston body 121, and the other end extends out of the lubricating wellbore 35 and is connected to an external driving member. Under the action of the driving force, the piston rod 122 drives the piston body 121 to slide up and down along the inner wall of the lubricating wellbore 35, thereby transferring the bottom water in the bottom water area 5 to the oil layer 6 through the sealed chamber 31. The driving member can be a motor or a cylinder.

[0040] In some embodiments, the device further comprises a combined well pattern, which comprises a steam injection horizontal well 2 and a production vertical well 1. The steam injection horizontal well 2 is used to inject steam into the oil layer 6 to form a steam chamber 11 and replenish the pressure of the oil layer 6. The production vertical well 1 is provided with a third perforation 9 at the bottom of the steam chamber 11. The function of the steam injection horizontal well 2 is to inject steam into the oil layer 6, heat the oil layer 6, reduce the viscosity of the heavy oil, and improve the fluidity of the heavy oil. For example, according to the geological characteristics of the oil field, the horizontal section length of the steam injection horizontal well 2 is designed to be 200 meters, and the well spacing between adjacent steam injection horizontal wells 2 is 100 meters; the main function of the production vertical well 1 is to produce crude oil. The distance between the production vertical well 1 and the steam injection horizontal well 2 is 50 meters, and the well spacing between adjacent production vertical wells 1 is 100 meters. The drilling depth of the production vertical well 1 is 15 meters below the oil-water interface 4. The production vertical well 1 is provided with a third perforation 9 at the bottom of the steam chamber 11. The third perforation 9 is located close to the bottom of the oil layer 6, which can effectively improve the vertical utilization efficiency of the oil layer 6. After steam is injected into the steam injection horizontal well 2, since the steam density is much smaller than the density of oil and water, a steam chamber 11 can be gradually formed at the top of the reservoir and gradually pushed downward. In this process, the high-temperature steam can greatly reduce the viscosity of the crude oil, making the crude oil more fluid, and can also drive the crude oil to flow to the production vertical well 1 at the bottom. The condensed water formed after the steam condenses also has the function of water drive. In addition, under the action of gravity, the crude oil is also easier to flow to the production position of the production vertical well 1 at the bottom. Moreover, since the crude oil is driven from top to bottom, the injected steam can timely make up for the pressure reduction caused by the production of crude oil, and can effectively reduce the cone advance of bottom water while producing oil.

[0041] In some embodiments, the bottom of the production vertical well 1 is set in the bottom water area 5, and a fourth perforation 10 is set at a position near the oil-water interface 4 in the bottom water area 5. The fourth perforation 10 is used to inject a water plugging agent into the bottom water in the bottom water area to form a water layer artificial baffle 7 at a position near the oil-water interface 4 in the bottom water area 5. The production vertical well 1 is drilled to a depth of 15 meters below the oil-water interface 4, and a fourth perforation 10 is made at a position near the oil-water interface 4 in the bottom water area 5, and the water plugging agent is injected through the fourth perforation 10. The injection amount of the water plugging agent is determined according to the vertical well spacing and the thickness of the water layer artificial baffle 7 to be set. For example, the injection amount of the water plugging agent for a single well in an oil field is to form a water layer artificial baffle 7 of 100m×100m×15m, so that the water plugging agent distribution range is continuous and has a certain thickness. The water layer artificial baffle 7 can effectively prevent the bottom water from cone-forming upward due to the pressure of the oil layer 6 being lower than the bottom water pressure.

[0042] In some embodiments, the production horizontal well is also used to inject a thickener or a thickening agent into the oil layer 6 between the steam chamber 11 and the oil-water interface 4 to thicken the crude oil, so as to form an oil layer artificial partition 8 at a position of the oil layer 6 close to the oil-water interface 4. A certain thickness of the thick oil layer 6 is retained between the formed steam chamber 11 and the oil-water interface 4, and a thickener or a thickening agent is injected to thicken the bottom crude oil, which serves as an oil layer artificial partition 8, thereby further controlling the bottom water coning.

[0043] In some embodiments, a cement filling layer (not shown in the figure) is further included, and the cement filling layer is located between the third perforation 9 and the oil layer artificial partition 8. The well section below the location of the third perforation 9 is filled with cement, and a cement filling layer is formed between the third perforation 9 and the oil layer artificial partition 8, so that the oil layer 6 of the part of the oil layer artificial partition 8 and the water layer artificial partition 7 that is expected to be mined is completely isolated, so as to prevent bottom water from entering the production vertical well 1 and affecting the extraction of crude oil.

[0044] In a second aspect of the embodiment of the present application, a bottom water coning suppression method is provided, using the bottom water coning suppression device in the first aspect, see Figure 5 As shown, including:

[0045] Step S1: in response to the pumping instruction, the piston 12 is controlled to move upward, so that the first valve 13 is opened and the second valve 14 is closed, and the bottom water in the bottom water area 5 is pumped into the sealed chamber 31 through the first perforation 32;

[0046] Step S2 : in response to the injection instruction, the piston 12 is controlled to move downward, so that the first valve 13 is closed and the second valve 14 is opened, and the bottom water in the sealed chamber 31 is injected into the oil layer 6 through the second perforation 33 .

[0047] The bottom water cone advancement suppression method proposed in the embodiment of the present application controls the piston 12 to move upward in response to the pumping instruction, so that the first valve 13 is opened and the second valve 14 is closed, and the bottom water in the bottom water area 5 is pumped into the sealed chamber 31 through the first perforation 32; and controls the piston 12 to move downward in response to the injection instruction, so that the first valve 13 is closed and the second valve 14 is opened, and the bottom water in the sealed chamber 31 is injected into the oil layer 6 through the second perforation 33, so that the bottom water in the bottom water area 5 is pumped into the oil layer 6, so that the pressure of the oil layer 6 is balanced with the pressure of the bottom water area 5, and the bottom water cone advancement upward caused by the pressure of the oil layer 6 being lower than the pressure of the bottom water area 5 is prevented; at the same time, there is no need to raise the perforation section, and the bottom crude oil can still be mined, and after the bottom water enters the oil layer 6, it is distributed at the bottom of the oil layer 6, and the crude oil at the bottom of the oil layer 6 can be displaced upward for easy mining.

[0048] In some embodiments, the method further includes: step S3: injecting steam into the oil layer 6 through the steam injection horizontal well 2 of the bottom water cone advancement suppression device to form a steam chamber 11 and replenish the pressure of the oil layer 6; and producing oil through the third perforation 9 set at the bottom of the steam chamber 11 of the production vertical well 1. Steam is injected into the oil layer 6 through the steam injection horizontal well 2 to heat the oil layer 6, reduce the viscosity of the heavy oil, and improve the fluidity of the heavy oil; the main function of the production vertical well 1 is to produce crude oil. The production vertical well 1 is provided with a third perforation 9 at the bottom of the steam chamber 11. The third perforation 9 is located close to the bottom of the oil layer 6, which can effectively improve the vertical utilization efficiency of the oil layer 6. After the steam is injected into the steam injection horizontal well 2, since the steam density is much smaller than the density of oil and water, the steam chamber 11 can be gradually formed at the top of the oil reservoir and gradually advanced to the lower part. In this process, the high-temperature steam can greatly reduce the viscosity of the crude oil, making the crude oil have higher fluidity, and can also drive the crude oil to flow to the production vertical well 1 at the lower part. The condensed water formed after the steam condenses also has the function of water drive. In addition, under the action of gravity, the crude oil is also more likely to flow to the production position of the production vertical well 1 at the lower part. Moreover, since crude oil is displaced from top to bottom, the injected steam can timely compensate for the pressure drop caused by crude oil production, and can effectively reduce the coning of bottom water while producing oil.

[0049] In some embodiments, the method further includes: step S4: injecting a water plugging agent into the bottom water through the fourth perforation 10 of the bottom water cone advancement suppression device to form a water layer artificial baffle 7 at a position near the oil-water interface 4 in the bottom water area 5. The production vertical well 1 is drilled to a depth of 15 meters below the oil-water interface 4, and a fourth perforation 10 is made at a position near the oil-water interface 4 in the bottom water area 5, and a water plugging agent is injected through the fourth perforation 10. The injection amount of the water plugging agent is determined according to the vertical well spacing and the thickness of the water layer artificial baffle 7 to be set. For example, the injection amount of the water plugging agent for a single well in an oil field is to form a 100m×100m×15m water layer artificial baffle 7, so that the water plugging agent distribution range is continuous and has a certain thickness. The water layer artificial baffle 7 can effectively prevent the bottom water from cone-advancing upwards due to the pressure of the oil layer 6 being lower than the bottom water pressure.

[0050] In some embodiments, the method further comprises: step S5: injecting a thickener or a thickening agent into the oil layer 6 between the steam chamber 11 and the oil-water interface 4 through the production horizontal well to thicken the crude oil, so as to form an oil layer artificial partition 8 at a position of the oil layer 6 close to the oil-water interface 4. A thick oil layer 6 of a certain thickness is retained between the formed steam chamber 11 and the oil-water interface 4, and a thickener or a thickening agent is injected to thicken the bottom crude oil, which serves as an oil layer artificial partition 8, thereby further controlling the bottom water coning.

[0051] In some embodiments, the method further includes: step S6: filling cement in the area between the third perforation 9 and the oil layer artificial partition 8 to form a cement filling layer to isolate the oil layer artificial partition 8 from the oil layer 6. Filling cement in the well section below the location of the third perforation 9 to form a cement filling layer between the third perforation 9 and the oil layer artificial partition 8, completely isolating the oil layer artificial partition 8 and the water layer artificial partition 7 from the oil layer 6 of the expected production part, preventing bottom water from entering the production vertical well 1 and affecting the production of crude oil.

[0052] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0054] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A bottom water coning suppression device, characterized in that: include: A self-injection and self-production well, wherein a sealed chamber is provided inside and extends to the bottom water zone and the oil layer respectively, wherein the sealed chamber is provided with a first perforation connected to the bottom water zone and a second perforation connected to the oil layer respectively; A piston is slidably disposed in the sealed chamber; a first valve, disposed in the first perforation; a second valve, disposed in the second perforation; When the piston moves upward, under the action of pressure, the first valve opens and the second valve closes, and the bottom water in the bottom water zone is pumped into the sealed chamber through the first perforation; when the piston moves downward, under the action of pressure, the first valve closes and the second valve opens, and the bottom water in the sealed chamber is injected into the oil layer through the second perforation.

2. The bottom water coning suppression device according to claim 1, characterized in that: The self-injection and self-production wells include: An injection and production wellbore, with two ends extending to the bottom water zone and the oil layer respectively, the bottom of the injection and production wellbore is sealed, and the first perforation and the second perforation are arranged on the inner wall of the injection and production wellbore; The bottom of the lubricating wellbore is sealed and connected to the top of the injection and production wellbore. The piston is arranged in the lubricating wellbore to form a sealed chamber between the piston and the injection and production wellbore.

3. The bottom water coning suppression device according to claim 2, characterized in that: The piston comprises a piston body and a piston rod, wherein the piston body is arranged in the lubricating wellbore; one end of the piston rod is connected to the piston body, and the other end extends out of the lubricating wellbore, and is used to drive the piston body to move under the action of a driving force.

4. The bottom water coning suppression device according to claim 1, characterized in that: It also includes a combined well network, which includes steam injection horizontal wells and production vertical wells. The steam injection horizontal wells are used to inject steam into the oil layer to form a steam chamber and supplement the pressure of the oil layer. The production vertical wells are provided with third perforations at the bottom of the steam chamber.

5. The bottom water coning suppression device according to claim 4, characterized in that: The bottom of the production vertical well is set in the bottom water area, and a fourth perforation is set at a position near the oil-water interface in the bottom water area. The fourth perforation is used to inject a water plugging agent into the bottom water of the bottom water area to form an artificial water layer baffle at a position near the oil-water interface in the bottom water area.

6. The bottom water coning suppression device according to claim 5, characterized in that: The production horizontal well is also used to inject a thickener or a thickening agent into the oil layer between the steam chamber and the oil-water interface to thicken the crude oil, so as to form an artificial oil layer partition at a position of the oil layer close to the oil-water interface.

7. The bottom water coning suppression device according to claim 6, characterized in that: It also includes a cement filling layer, which is located between the third perforation and the oil layer artificial partition.

8. A method for suppressing bottom water coning, using the bottom water coning suppression device according to any one of claims 1 to 7, characterized in that: include: In response to a pumping instruction, the piston is controlled to move upward, so that the first valve is opened and the second valve is closed, and the bottom water in the bottom water zone is pumped into the sealed chamber through the first perforation; In response to an injection instruction, the piston is controlled to move downward, so that the first valve is closed and the second valve is opened, and the bottom water in the sealed chamber is injected into the oil layer through the second perforations.

9. The bottom water coning suppression method according to claim 8, characterized in that: Also includes: Steam is injected into the oil layer through the steam injection horizontal well of the bottom water cone advancement suppression device to form a steam chamber and replenish the pressure of the oil layer; oil is produced through the third perforation set at the bottom of the steam chamber by the production vertical well.

10. The method for suppressing bottom water coning according to claim 9, characterized in that: Also includes: A water plugging agent is injected into the bottom water through the fourth perforation of the bottom water coning suppression device to form an artificial water layer partition at a position near the oil-water interface in the bottom water area.

11. The method for suppressing bottom water coning according to claim 10, characterized in that: Also includes: A thickener or thickener is injected into the oil layer between the steam chamber and the oil-water interface through a production horizontal well to thicken the crude oil, thereby forming an artificial partition in the oil layer near the oil-water interface.

12. The method for suppressing bottom water coning according to claim 11, characterized in that: Also includes: The area between the third perforation and the oil layer artificial partition is filled with cement to form a cement filling layer to isolate the oil layer artificial partition from the oil layer.

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