Horizontal well flow channel conversion double sealing and water plugging device and its operation method

Abstract

The application relates to a horizontal well flow channel conversion double-sealing water plugging device and a working method thereof, which comprises, from top to bottom, an upper joint, a back-off spring, a flow channel conversion device, an upper packer, a first squeeze pipe, a connecting sleeve, a second squeeze pipe, a lower packer and a tail plug, the flow channel conversion device comprises, from top to bottom, an upper central rod, an upper connecting sleeve, an upper switching valve, an upper packer connecting head and a squeeze central rod, the squeeze central rod is connected with a squeeze pipe transition copper sleeve, the squeeze pipe transition copper sleeve is connected with an upper connecting sleeve of the squeeze pipe, the upper connecting sleeve of the squeeze pipe is connected with the first squeeze pipe, the first squeeze pipe and the second squeeze pipe are connected through a middle connecting sleeve and an intermediate transition copper sleeve of the squeeze pipe, the second squeeze pipe is connected with the lower packer through a lower connecting sleeve of the squeeze pipe, and a sliding piston and the tail plug are sequentially connected below the lower packer. The horizontal well flow channel conversion double-sealing water plugging device can realize the functions of continuous sealing, unsealing, squeeze of plugging agents and the like.

Description

Technical Field

[0001] This invention relates to the field of downhole tool technology in the oil and gas industry, and more specifically, to a horizontal well flow channel conversion dual-seal setting and water shut-off device and its operation method. Background Technology

[0002] Downhole water shut-off is a complex systems engineering project involving many disciplines such as reservoir, oil production, and chemistry. Its essence is to control the water-to-oil ratio or water production, altering the flow characteristics of water in the formation. Currently, chemical water shut-off technology is the most widely used. Domestically and internationally, production horizontal wells mainly adopt screen-tube completion without packers. Formation water can flow radially and laterally in the annular space between the screen and the wellbore. Therefore, chemical methods are the only viable option for water shut-off in these horizontal wells, making water shut-off measures the most difficult. In recent years, China has made breakthroughs in the research of chemical gel materials for annular chemical packers (ACPs), promoting the application of this technology in major oilfields in China. However, the outer diameter of the injection tubing is generally large. Due to foreign technological embargoes on key tools such as expansion packers, the service cost of small-diameter, high-expansion-rate packers is expensive, and research on through-tubing packers is still very limited in China. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a horizontal well flow channel conversion double-seal setting and water plugging device and its operation method, which can be used repeatedly for setting and unsealing, thereby increasing the scope of tool application and shortening construction time.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: A horizontal well flow channel conversion double-seal setting and water-blocking device is constructed, comprising, from top to bottom, an upper connector, a return spring, a flow channel conversion device, an upper packer, a first injection pipe, a connecting sleeve, a second injection pipe, a lower packer, and a tail plug. The flow channel conversion device comprises, in sequence, an upper central rod, an upper connecting sleeve, an upper transition valve, an upper packer connector, and an injection central rod. The injection central rod is connected to the injection pipe transition copper sleeve, the injection pipe transition copper sleeve is connected to the injection pipe upper connecting sleeve, the injection pipe upper connecting sleeve is connected to the first injection pipe, the first and second injection pipes are connected through the injection pipe middle connecting sleeve and the intermediate transition copper sleeve, the second injection pipe is connected to the lower packer through the injection pipe lower connecting sleeve, and a sliding piston and a tail plug are connected in sequence below the lower packer.

[0005] According to the above scheme, the upper connector is connected to the drill pipe of the coiled tubing.

[0006] According to the above scheme, the upper packer and the lower packer include an expansion tube, which expands due to the inlet pressure of the liquid inlet.

[0007] According to the above scheme, the upper center rod is provided with a flow channel inlet, and the well fluid enters the setting seal flow channel through the flow channel inlet.

[0008] According to the above scheme, the lower end of the upper center rod is provided with a sealing ring for sealing the injection fluid inlet.

[0009] According to the above scheme, the first injection pipe and the second injection pipe are provided with a liquid passage and an injection liquid outflow passage on the pipe wall.

[0010] According to the above scheme, the upper packer and the lower packer are expansion packers, and the setting channels of the upper packer and the lower packer are connected, which can realize simultaneous setting and unsetting.

[0011] The present invention also provides a method for operating the aforementioned horizontal well flow channel conversion double-seal setting and water-blocking device, comprising the following steps:

[0012] S1. When the water shut-off device is in the initial state, the setting flow channels of the upper packer and the lower packer are open. The well fluid flows into the setting flow channel through the inlet of the upper center rod. The well fluid flows to the upper packer and the lower packer through the fluid passage left by the upper connecting sleeve, the upper transfer valve, the upper packer connector, and the squeezing center rod. At this time, the plugging agent working flow channel is in the closed state.

[0013] S2. The internal pressure of the fluid in the coiled tubing pump column increases, causing the upper and lower packers to expand and set.

[0014] S3. At this time, the lowered tubing column moves down, sealing the inlet to keep the upper and lower packers in a set state. At the same time, the displacement of the upper central rod opens the sealing agent flow channel.

[0015] S4. Pump the plugging agent liquid through the first injection pipe and the second injection pipe into the formation between the upper packer and the lower packer for plugging operation;

[0016] S5. After completing the sealing operation, clean the injection channel with clean water, and then lift the center rod to close the injection channel.

[0017] The horizontal well flow channel conversion double-seal setting and water-blocking device and its operation method of the present invention have the following characteristics:

[0018] Beneficial effects:

[0019] 1. The expandable packer cartridge of this invention has an inlet channel communicating with the fluid inside the pipe. The fluid expands the cartridge through the inlet channel to seal the wellbore. A flow channel conversion device is arranged within the water shut-off device. The injection fluid enters the injection fluid channel through the flow channel conversion device. The injection fluid channel is the outlet channel communicating with the formation. After the cartridge completes expansion, the connection between the cartridge and the inlet channel is closed by pressing down the tubing string to maintain continuous pressure and seal the cartridge. Simultaneously, the flow channel conversion device opens the outlet channel of the injection fluid to communicate with the formation, thereby enabling the sealing of leaking formation areas.

[0020] 2. This invention can adapt to the following operations required in the tubing string: expanding the packer sleeve, locking the pressure inside the sleeve, opening the injection port for injection, closing the injection port, and releasing the packer. When the water-plugging device needs to be repeatedly operated downhole, the device needs to be restored to its initial state before it can be re-sealed, thus achieving sealing of the water-plugging area again. It offers good sealing performance, high construction efficiency, and is beneficial for repeated water-plugging operations, possessing broad application prospects.

[0021] 3. The water-blocking device provided by this invention has an outer diameter that is consistent with the outer diameter of the coiled tubing connector in its original state. It uses a small diameter to seal a large diameter wellbore, and the water-blocking device has strong internal flow performance in the wellbore.

[0022] 4. The present invention provides a water-blocking device that enables rapid switching between two flow channels without interference during operation, thereby improving efficiency.

[0023] 5. The number of injection tubing columns in the water-blocking device provided by this invention can be flexibly increased or decreased, and the blocking range is wide. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0025] Figure 1 This is an initial state diagram of the double-seal seated water-blocking tool in this invention;

[0026] Figure 2 This is a diagram showing the setting and sealing state of the double-seal water-blocking system in this invention.

[0027] Figure 3 This is a cross-sectional view of the double-seal seated water-blocking tool in this invention;

[0028] Figure 4 This is a cross-sectional view of the flow channel conversion device in this invention;

[0029] Figure 5 This is a view of the sealing and unsealing flow channels of the present invention;

[0030] Figure 6 This is a view of the injection flow channel of the present invention. Detailed Implementation

[0031] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] like Figure 1-6 As shown, the horizontal well flow channel conversion double-sealed water plugging device of the present invention includes an upper connector 1, a return spring 2, a flow channel conversion device 3, an upper packer 4, a first injection pipe 5, a connecting sleeve 6, a second injection pipe 7, a lower packer 8, and a tail plug 9, which are connected sequentially from top to bottom.

[0033] The flow channel conversion device 3 includes an upper central rod 302, an upper connecting sleeve 304, an upper transition valve 305, an upper packer connector 306, and an extrusion central rod 307 connected in sequence. The extrusion central rod 307 is connected to an extrusion tube transition copper sleeve 308, and the extrusion tube transition copper sleeve 308 is connected to an upper connecting sleeve 309 of the extrusion tube. The upper connecting sleeve 309 of the extrusion tube is connected to the first extrusion tube 5. The first extrusion tube 5 and the second extrusion tube 7 are connected through an intermediate connecting sleeve 6 and an intermediate transition copper sleeve 310. The second extrusion tube 7 is connected to the lower packer 8 through a lower connecting sleeve 311 of the extrusion tube. A sliding piston 301 and a tail plug 9 are connected in sequence below the lower packer 8.

[0034] Preferably, the upper connector 1 is connected to the drill pipe thread of the continuous tubing 101.

[0035] Preferably, the upper packer 4 and the lower packer 8 include an expanding rubber sleeve. The expanding rubber sleeve expands due to the inlet pressure, allowing it to maintain a continuous seal after sealing the inlet. Since the rubber sleeve moves upwards during packer setting, the sliding piston 301 compensates for the upward movement of the expanding rubber sleeve during the packer setting process.

[0036] Preferably, the upper center rod 302 is movable, and the upper center rod 302 is provided with a flow channel inlet to allow well fluid to enter the setting flow channel through the flow channel inlet. The lower end of the upper center rod is sealed with a sealing ring to seal the injection fluid inlet, which plays the role of sealing the injection fluid inlet during the packer setting process.

[0037] Preferably, the lower end of the upper center rod 302 is provided with a sealing ring for sealing the injection fluid inlet.

[0038] Preferably, the first injection tube 5 and the second injection tube 7 are provided with a liquid passage and an injection liquid outflow passage on the tube wall, and the number of injection tubes can be increased according to the length of the blockage.

[0039] Preferably, the upper packer 4 and the lower packer 8 are expansion packers, and the setting channels of the upper packer 4 and the lower packer 8 are connected, which can realize simultaneous setting and unsealing.

[0040] Preferably, the horizontal well flow channel conversion dual-seal setting and plugging device has a setting flow channel and an injection flow channel. The two flow channels are not connected. The flow channel conversion device ensures that the packer can be continuously set during the injection of the plugging agent, and the injection fluid will not contaminate the setting flow channel during the injection process. Figure 5 The direction indicated by the middle arrow shows the sealed flow channel. Figure 6 The direction indicated by the middle arrow shows the injection channel.

[0041] This invention also provides a method for operating a horizontal well flow channel conversion dual-seal setting and water-blocking device, comprising the following steps:

[0042] S1. When the water shut-off device is in the initial state, the setting flow channels of the upper packer 4 and the lower packer 8 are open. The well fluid flows into the setting flow channel through the inlet of the upper center rod 302. The well fluid flows to the upper packer 4 and the lower packer 8 through the fluid passages left by the upper connecting sleeve 304, the upper transfer valve 305, the upper packer connector 306, and the squeezing center rod 307. At this time, the plugging agent working flow channel is in the closed state.

[0043] S2. The internal pressure of the fluid in the coiled tubing pump column increases, causing the upper packer 4 and the lower packer 8 to expand and set.

[0044] S3. At this time, the lowered tubing column moves down and the upper center rod 302 moves down to seal the inlet to keep the upper packer 4 and the lower packer 8 in a set state. At the same time, the displacement of the upper center rod 302 makes the sealing agent flow channel open.

[0045] S4. Pumping the plugging agent liquid through the first injection pipe 5 and the second injection pipe 7 into the formation between the upper packer 4 and the lower packer 8 to carry out the plugging operation;

[0046] S5. After completing the sealing operation, clean the injection channel with clean water, and then lift the center rod 302 to close the injection channel.

[0047] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A horizontal well flow channel conversion double-seal setting and water-blocking device, characterized in that, The device includes, from top to bottom, an upper connector (1), a return spring (2), a flow channel conversion device (3), an upper packer (4), a first extrusion tube (5), a connecting sleeve (6), a second extrusion tube (7), a lower packer (8), and a tail plug (9). The flow channel conversion device (3) includes, from top to bottom, an upper center rod (302), an upper connecting sleeve (304), an upper adapter valve (305), an upper packer connector (306), and an extrusion center rod (307). The extrusion center rod (307) is connected to the extrusion tube transition copper sleeve (308), and the extrusion tube transition copper sleeve (308) is connected to the extrusion tube upper connecting sleeve (309). The extrusion tube upper connecting sleeve (309) is connected to... The first injection pipe (5) is connected, and the first injection pipe (5) and the second injection pipe (7) are connected through the middle connecting sleeve (6) and the intermediate transition copper sleeve (310) of the injection pipe. The second injection pipe (7) is connected to the lower packer (8) through the lower connecting sleeve (311) of the injection pipe. The lower packer (8) is connected in sequence to the sliding piston (312) and the tail plug (9). The upper center rod (302) is provided with a flow channel inlet. The well fluid enters the setting flow channel through the flow channel inlet. The lower end of the upper center rod (302) is provided with a sealing ring for sealing the injection fluid inlet. The first injection pipe (5) and the second injection pipe (7) are provided with a fluid passage and an injection fluid outflow passage on the pipe wall.

2. The horizontal well flow channel conversion double-seal setting and water-blocking device according to claim 1, characterized in that, The upper connector (1) is connected to the drill pipe thread of the coiled tubing (101).

3. The horizontal well flow channel conversion double-seal setting and water-blocking device according to claim 1, characterized in that, The upper packer (4) and the lower packer (8) include an expansion tube, which expands due to the inlet pressure of the liquid inlet.

4. The horizontal well flow channel conversion double-seal setting and water-blocking device according to claim 1, characterized in that, The upper packer (4) and the lower packer (8) are expansion packers. The setting channels of the upper packer (4) and the lower packer (8) are connected, which can realize simultaneous setting and unsealing.

5. A method for operating the horizontal well flow channel conversion double-seal setting and water-blocking device as described in claim 1, characterized in that, Includes the following steps: S1. When the water plugging device is in the initial state, the setting flow channels of the upper packer (4) and the lower packer (8) are open. The well fluid flows into the setting flow channel through the inlet of the upper center rod (302). The well fluid flows to the upper packer (4) and the lower packer (8) through the fluid passage left by the upper connecting sleeve (304), the upper transfer valve (305), the upper packer connector (306), and the squeezing center rod (307). At this time, the plugging agent operation flow channel is closed. S2. The internal pressure of the fluid in the coiled tubing pump column increases, causing the upper packer (4) and the lower packer (8) to expand and set. S3. At this time, the tubing is pressed down and the upper center rod (302) moves down to seal the inlet to keep the upper packer (4) and the lower packer (8) in a seated state. At the same time, the displacement of the upper center rod (302) makes the sealing agent flow channel open. S4. Pump the plugging agent liquid through the first injection pipe (5) and the second injection pipe (7) into the formation between the upper packer (4) and the lower packer (8) for plugging operation; S5. After completing the sealing operation, clean the injection channel with clean water, and then lift the center rod (302) to close the injection channel.

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