Open hole multi-channel packer with multiple sealing mechanisms

Abstract

The invention provides an open hole multi-channel packer with multiple sealing mechanisms, and relates to the technical field of oil and gas exploitation, the open hole multi-channel packer comprises an isolation assembly, a valve system and a rubber sleeve sealing assembly, and the isolation assembly comprises a body; the body is provided with high-pressure fluid hole channels which are communicated with one another and sand prevention filling channels which are isolated from the high-pressure fluid hole channels; the valve system comprises a starting valve, a check valve and a locking valve; the starting valve, the check valve and the locking valve are assembled on the body and are sequentially communicated with the high-pressure fluid hole channel; the rubber sleeve sealing assembly is connected with the body and communicates with the output end of the high-pressure fluid hole channel, and high-pressure fluid enters the rubber sleeve sealing assembly through the valve system and the high-pressure fluid hole channel so as to drive the rubber sleeve sealing assembly to expand in the radial direction and be attached to the open hole well wall to form sealing. The packer is provided with multiple sealing mechanisms, and the problem of sealing failure of the packer caused by high-pressure fluid leakage can be effectively solved.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction technology, and in particular to a naked-eye multi-channel packer with multiple sealing mechanisms. Background Technology

[0002] As oilfield development progresses towards extended reach horizontal wells and open-hole wells in complex lithology, the demand for gravel packing and water control completion in extended reach horizontal wells continues to rise. Horizontal well open-hole segmented packing technology can significantly improve sand control and packing efficiency in horizontal wells, and also enables water control and compartmentalized production, becoming a key technology for promoting efficient segmented oil production in oilfields.

[0003] Currently, the main tools used for open-hole well packing in the industry are self-expanding packers, compression packers, and expansion packers. For precise segmentation and effective packing, packers need to be set to complete the segmentation before sand control and production can proceed. Self-expanding packers require a long setting time, which is not suitable for the high-efficiency operation characteristics of oilfields. Compression packers, due to their short effective sleeve length, have a small effective contact area after sealing with the open-hole wall, and require high precision in wellbore shape and wall roughness, making long-term packing impossible. Expansion packers, with sleeves exceeding 1 meter, adhere tightly to the open-hole wall after setting, effectively sealing irregular wellbores and making them the preferred method for open-hole well segmentation.

[0004] However, expansion packers require a long-term effective sealing mechanism to prevent leakage of internal high-pressure fluid; otherwise, the expansion packer will depressurize and break open. The applicant has found that in practical applications, expansion packers have poor long-term sealing performance and are prone to breaking open due to high-pressure fluid leakage, thus failing to meet the requirements for sand control during offshore open-hole bypass filling.

[0005] Therefore, there is an urgent need for a naked-eye multi-channel packer with multiple sealing mechanisms to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a naked-eye multi-channel packer with multiple sealing mechanisms, which can prevent packer sealing failure caused by high-pressure fluid leakage. The various technical effects of the preferred technical solutions provided by this invention are detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a naked-eye multi-channel packer with multiple sealing mechanisms, characterized in that it includes an isolation assembly, a valve system, and a rubber sleeve sealing assembly, wherein: The isolation assembly includes a body, which has interconnected high-pressure fluid channels and sand-proof filling channels isolated from the high-pressure fluid channels. The valve system includes a start valve, a check valve, and a lock valve. The start valve, the check valve, and the lock valve are all assembled on the body and connected in sequence to the high-pressure fluid channel. The start valve is used to control the setting seal to start, the check valve is used to allow unidirectional flow of high-pressure fluid, and the lock valve is used to control the setting seal to stop and block the passage. The rubber sleeve sealing assembly is connected to the body and communicates with the output end of the high-pressure fluid channel. High-pressure fluid enters the rubber sleeve sealing assembly through the valve system and the high-pressure fluid channel to drive its radial expansion and form a seal with the open hole well wall.

[0008] Furthermore, the high-pressure fluid channel includes a radially arranged inlet hole and an axially arranged transmission hole. The inlet hole is connected to the start valve, and the transmission hole is connected to the start valve, the check valve, the locking valve, and the rubber sleeve sealing assembly.

[0009] Furthermore, the isolation assembly also includes an upper connector, a filling sleeve, an upper sealing cylinder, an upper sealing stub, a lower sealing stub, a connecting sleeve, and a lower sealing cylinder, wherein the upper connector, the filling sleeve, the upper sealing cylinder, the upper sealing stub, the body, the lower sealing stub, the connecting sleeve, and the lower sealing cylinder are connected in sequence, wherein: The main body is provided with a crescent-shaped through hole. One end of the crescent-shaped through hole is connected to the annular cavity formed by the filling sleeve, the upper sealing cylinder, and the upper sealing short section. The other end of the crescent-shaped through hole is connected to the annular cavity formed by the lower sealing short section, the connecting sleeve, and the lower sealing cylinder, forming the sand-proof filling channel.

[0010] Furthermore, the starting valve includes a first sealing ring, a first valve core, a limiting spring, a limiting pin, a pressure cap, and a shearing pin. The first valve core is slidably engaged with the body and sealed by the first sealing ring. The shearing pin passes through the limiting pin and the pressure cap to limit the first valve core. The limiting spring is sleeved on the first valve core and provides it with a reset force.

[0011] Furthermore, the one-way valve includes a piston, a return spring, and a plug. The piston is slidably engaged with the body, the return spring abuts against the piston and the plug, the plug is fixedly connected to the body and a second sealing ring is provided at the engagement point with the body, the high-pressure fluid pushes the piston to compress the return spring to open the passage, and after the pressure is released, the return spring pushes the piston to close the passage.

[0012] Furthermore, the locking valve includes a third sealing ring, a second valve core, a shear sleeve, a shear pin, and a pressure cap. The second valve core is slidably engaged with the body and sealed by the third sealing ring. The shear pin passes through the second valve core and the pressure cap to limit the second valve core. The second valve core can move after being sheared by the thrust of the high-pressure fluid to block the high-pressure fluid passage.

[0013] Furthermore, the rubber sleeve sealing assembly includes an upper shoulder, a rubber sleeve, and a lower shoulder, wherein: The two ends of the rubber tube are respectively connected to the upper shoulder and the lower shoulder. The upper shoulder is fixedly connected to the body, and the lower shoulder can slide axially on the connecting sleeve.

[0014] Furthermore, a sealing groove is provided inside the lower shoulder guard, and a sealing element is installed in the sealing groove. The sealing element is used to seal the sliding part between the lower shoulder guard and the isolation assembly.

[0015] Furthermore, the rubber sleeve, the upper shoulder guard, and the lower shoulder guard are all integrally connected through a vulcanization process, and the upper shoulder guard is welded and fixed to the body.

[0016] Furthermore, the connecting sleeve and the lower sealing cylinder can be connected to the annular isolation tool to control the opening and closing of the sand-proof filling channel.

[0017] This invention provides an open-hole multi-channel packer with multiple sealing mechanisms, including an isolation assembly, a valve system, and a rubber sleeve sealing assembly. Through internal pressurization, high-pressure fluid passes through multiple valve systems and is permanently sealed within the packer's internal cavity, achieving long-term sealing and reducing operating costs. Simultaneously, through the effective cooperation of the isolation assembly, valve system, and rubber sleeve sealing assembly, once the packer is set, repressurization will not require secondary setting, effectively avoiding the risk of packer failure due to abnormal high pressure and improving reliability. By incorporating sand-control filling channels, the packer can be set first and then subjected to segmented gravel filling, improving the efficiency of horizontal open-hole stratification. It can also be used in conjunction with annular isolation tools to open or close bypass channels, making it particularly suitable for segmented sand control completion in horizontal open-hole wells. Furthermore, this open-hole multi-channel packer with multiple sealing mechanisms includes a sealing cylinder, providing a good tubing foundation for segmented production in oil wells. During operation, the multiple sealing mechanism can effectively prevent the rubber sleeve seal from failing due to high pressure fluid leakage. Once the packer has completed setting, the valve system will be permanently closed, effectively avoiding packer failure caused by abnormal high pressure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the naked-eye multi-channel packer with multiple sealing mechanisms of the present invention; Figure 2 This is a schematic diagram of the internal structure of the naked-eye multi-channel packer with multiple sealing mechanisms of the present invention; Figure 3 This is a schematic diagram of the structure of the main body of the naked-eye multi-channel packer with multiple sealing mechanisms of the present invention; Figure 4 yes Figure 2 Schematic diagram of the sectional structure of the middle AA section; Figure 5 This is a schematic diagram of the limiting pin structure in the naked-eye multi-channel packer with multiple sealing mechanisms of the present invention; Figure 6 This is a schematic diagram of the pressure cap structure in the naked-eye multi-channel packer with multiple sealing mechanisms of the present invention; Figure 7 yes Figure 2 Schematic diagram of the cross-sectional structure of the middle BB; Figure 8 yes Figure 2 Schematic diagram of the cross-sectional structure of the middle CC section; Figure 9 This is a schematic diagram of the reset state of the start valve in the naked-eye multi-channel packer with multiple sealing mechanisms of the present invention; Figure 10 This is a schematic diagram of the locking valve in the closed state of the naked-eye multi-channel packer with multiple sealing mechanisms of the present invention.

[0020] In the diagram: 1. Upper connector; 2. Filling sleeve; 3. Upper sealing cylinder; 4. Upper sealing stub; 5. Body; 6. Lower sealing stub; 7. Upper shoulder; 8. Rubber sleeve; 9. Connecting sleeve; 10. Lower shoulder; 11. Lower sealing cylinder; 100. Liquid inlet; 101. First transfer hole; 102. Second transfer hole; 103. Third transfer hole; 104. Fourth transfer hole; 201. Start valve mounting hole; 202. Check valve mounting hole; 203. Locking valve mounting hole; 12. Starting valve; 1201. First sealing ring; 1202. First valve core; 1203. Limit spring; 1204. Limit pin; 1205. Pressure cap; 1206. Shear pin; 13. Check valve; 1301. Piston; 1302. Return spring; 1303. Second sealing ring; 1304. Plug; 14. Locking valve; 1401. Third sealing ring; 1402. Second valve core; 1403. Shear sleeve; 1404. Shear pin; 1405. Pressure cap. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] In the description of this invention, it should be understood that the terms "center," "side," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] To address the shortcomings of existing expansion packers in maintaining good sealing performance over long periods, and considering the need for sand control during open-hole bypass filling at sea, this embodiment provides an open-hole multi-channel packer with multiple sealing mechanisms. Figure 1 This is a structural schematic diagram of this embodiment. Figure 2 yes Figure 1 A schematic diagram of the internal structure, such as Figure 1 and Figure 2As shown, the naked-eye multi-channel packer with multiple sealing mechanisms includes an isolation assembly, a valve system, and a rubber sleeve sealing assembly. The isolation assembly includes an upper connector 1, a filling sleeve 2, an upper sealing cylinder 3, an upper sealing section 4, a body 5, a lower sealing section 6, a connecting sleeve 9, and a lower sealing cylinder 11. The rubber sleeve sealing assembly includes an upper shoulder 7, a rubber sleeve 8, and a lower shoulder 10. Both ends of the rubber sleeve 8 are connected to the upper shoulder 7 and the lower shoulder 10, respectively. The upper shoulder 7 is fixedly connected to the body 5, and the lower shoulder 10 can slide axially on the connecting sleeve 9. The valve system includes an initiation valve 12, a check valve 13, and a locking valve 14.

[0025] Specifically, Figure 3 This is a schematic diagram of the structure of the main body in this embodiment, as shown below. Figure 3 As shown, the main body 5 has interconnected high-pressure fluid channels and a sand-control and filling channel isolated from the high-pressure fluid channels. The high-pressure fluid channels are the collective term for multiple interconnected channels on the main body 5, serving as the sole transmission path for the high-pressure fluid. The sand-control and filling channel is a cavity structure independent of the high-pressure fluid channels, with no connection to them, used to provide a flow path for gravel filling. By setting up a bypass isolation channel, a dedicated flow path is provided for gravel filling, while simultaneously isolating it from the internal channels. This achieves the goal of first setting the packer in sections before filling with sand control in open-hole wells, meeting the requirements for segmented sand control in open-hole wells.

[0026] like Figures 1-3 As shown, in this embodiment, the starting valve 12, the check valve 13, and the locking valve 14 are all assembled in the body 5. Specifically, the starting valve 12, the check valve 13, and the locking valve 14 are sequentially assembled in the preset mounting holes of the body 5 along the flow direction of the high-pressure fluid, and are sequentially connected to the high-pressure fluid channels to form a series valve control passage. In use, the starting valve 12 is used to control the setting of the packer, the check valve 13 is used to allow unidirectional flow of the high-pressure fluid, and the locking valve 14 is used to control the termination of the setting and to block the passage. During operation, the high-pressure fluid enters the valve system sequentially through internal pressurization, which can control the setting start pressure and setting end pressure of the packer, while preventing leakage of the high-pressure fluid entering the packer.

[0027] like Figure 2 and Figure 3 As shown, the rubber sleeve seal assembly is connected to the right end of the body 5 and communicates with the output end of the high-pressure fluid channel. High-pressure fluid enters the rubber sleeve seal assembly through the valve system and the high-pressure fluid channel to drive its radial expansion and form a seal against the open hole well wall. During operation, the high-pressure fluid entering the packer causes the rubber sleeve 8 to expand radially, thereby tightly adhering to the open hole well wall to form an effective seal.

[0028] This open-hole multi-channel packer with multiple sealing mechanisms includes an isolation assembly, a valve system, and a rubber sleeve sealing assembly. Through internal pressurization, high-pressure fluid passes through multiple valve systems and is permanently sealed within the packer's internal cavity, achieving long-term sealing and reducing operating costs. Simultaneously, through the effective coordination of the isolation assembly, valve system, and rubber sleeve sealing assembly, once the packer is set, repressurization will not require re-setting, effectively avoiding the risk of packer failure due to abnormal high pressure and improving tool reliability. By incorporating sand-control filling channels, the packer can be set first, followed by segmented gravel filling, improving the efficiency of horizontal open-hole stratification. It can also be used with annular isolation tools to open or close bypass channels, making it particularly suitable for segmented sand control completion in horizontal open-hole wells. Furthermore, this open-hole multi-channel packer with multiple sealing mechanisms contains a sealing sleeve, providing a good tubing foundation for segmented production in oil wells. During operation, the multiple sealing mechanism can effectively prevent the rubber sleeve seal from failing due to high pressure fluid leakage. Once the packer has completed setting, the valve system will be permanently closed, effectively avoiding packer failure caused by abnormal high pressure.

[0029] As an optional implementation method, such as Figure 3 As shown, the high-pressure fluid channel includes a radially arranged inlet port 100 and an axially arranged transmission port. The inlet port 100 is connected to the start valve 12. The transmission port is connected to the start valve 12, the check valve 13, the locking valve 14, and the rubber sleeve sealing assembly.

[0030] In this embodiment, the transmission holes are a first transmission hole 101, a second transmission hole 102, a third transmission hole 103, and a fourth transmission hole 104, which are axially opened on the same side wall of the main body 5. The main body 5 also has a start valve mounting hole 201, a check valve mounting hole 202, and a lock valve mounting hole 203 on the tangential direction of its outer circumferential side wall for mounting the start valve 12, the check valve 13, and the lock valve 14. One end of the inlet hole 100 is connected to the high-pressure fluid source inside the packer, and the other end is connected to the bottom of the start valve mounting hole 201, serving as the only inlet for the high-pressure fluid to enter the valve system.

[0031] Specifically, in this embodiment, the first transmission hole 101 connects the middle of the start valve mounting hole 201 to the bottom of the check valve mounting hole 202; the fourth transmission hole 104 connects the check valve mounting hole 202 to the locking valve mounting hole 203; the third transmission hole 103 connects the middle of the locking valve mounting hole 203 to the internal cavity of the rubber sleeve sealing assembly; the second transmission hole 102 connects the bottom of the locking valve mounting hole 203 to the internal cavity of the rubber sleeve sealing assembly; and the left end of the first transmission hole 101 and the right end of the fourth transmission hole are blocked to ensure the directional transmission of high-pressure fluid. By setting a radial inlet hole 100 in conjunction with multiple axial transmission holes, the directional flow of high-pressure fluid from the inside of the isolation assembly to the valve system and then to the rubber sleeve sealing assembly is realized, ensuring the orderly linkage of the valve system and providing a structural basis for the graded control of the setting seal pressure.

[0032] As an optional implementation method, such as Figure 2 and Figure 3 As shown, in this embodiment, the body 5 is provided with a crescent-shaped through hole. One end of the crescent-shaped through hole is connected to the annular cavity formed by the filling sleeve 2, the upper sealing cylinder 3, and the upper sealing short section 4; the other end of the crescent-shaped through hole is connected to the annular cavity formed by the lower sealing short section 6, the connecting sleeve 9, and the lower sealing cylinder 11, forming a sand-proof filling channel.

[0033] Specifically, in this embodiment, the upper connector 1 has female threads at both ends, and the internal diameter reduction area serves as a sealing surface. The left end is used to connect to the external tubing, and the right end is threaded to the filling sleeve 2. The filling sleeve 2 has a radial through hole on its exterior, and threads at both ends, which are threaded to the left end of the upper sealing cylinder 3. The left end of the upper sealing cylinder 3 has a smooth sealing surface and a rectangular groove, and the right end is threaded to the upper sealing stub 4. The upper sealing stub 4 has threads at both ends, and the right end is threaded to the left end of the body 5. The body 5 has stepped countersunk holes at both ends and a through hole in the middle, with two female threads at both ends. A crescent-shaped through hole is opened axially between the female threads at both ends of the body 5. The lower sealing stub 6 has threads at both ends, with the left end threaded to the right end of the body 5 and the right end threaded to the left end of the lower sealing cylinder 11. Both ends of the connecting sleeve 9 are threaded. The left end is connected to the larger female thread on the right end of the body 5, and the outside is in sliding fit with the lower shoulder 10. The right end of the lower sealing cylinder 11 is a sealing smooth surface with a rectangular groove, which fits with the right end of the connecting sleeve. The filling sleeve 2, the upper sealing cylinder 3, and the upper sealing short section 4 enclose each other to form an upper annular cavity, and the lower sealing short section 6, the connecting sleeve 9, and the lower sealing cylinder 11 enclose each other to form a lower annular cavity. The crescent-shaped through hole of the body 5 connects the upper annular cavity and the lower annular cavity, forming an annular sand-proof filling channel that runs through the entire isolation assembly.

[0034] By incorporating threaded connections between the components of the isolation assembly, along with sealing surfaces and rectangular grooves, the sealing performance of the sand-control filling channel is ensured, preventing leakage of the filling medium. A combination of crescent-shaped through-holes and annular cavities forms a sand-control filling channel with a large flow cross-section, meeting the flow requirements of gravel filling and improving filling efficiency. The sand-control filling channel runs axially through the packer, effectively adapting to the tubing layout of horizontal open-hole wells and enabling continuous segmented gravel filling operations. Standardized threaded connections for all components improve assembly efficiency and maintenance convenience, meeting the high-efficiency operational needs of oilfield sites.

[0035] As an optional implementation method, Figure 4 yes Figure 2 Schematic diagram of the sectional structure of the middle AA, as shown below. Figure 4 As shown, the starting valve 12 includes a first sealing ring 1201, a first valve core 1202, a limiting spring 1203, a limiting pin 1204, a pressure cap 1205, and a shear pin 1206. The first valve core 1202 is slidably fitted with the body 5. The shear pin 1206 passes through the limiting pin 1204 and the pressure cap 1205 to limit the first valve core 1202. The limiting spring 1203 is sleeved on the first valve core 1202 and provides it with a restoring force.

[0036] Specifically, in this embodiment, the first valve core 1202 has a cylindrical stepped structure with a diameter that gradually decreases from left to right. A rectangular groove is provided on the outside, and a first sealing ring 1201 is installed within the groove to achieve a dynamic seal between it and the valve mounting hole 201. The limiting spring 1203 is a cylindrical spring that is sleeved on the cylindrical step in the middle of the first valve core 1202. One end contacts the large end step of the first valve core 1202, and the other end provides a reset thrust.

[0037] Figure 5 This is a schematic diagram of the limiting pin structure in this embodiment, as shown below. Figure 5 As shown, the limiting pin 1204 has a split structure. The right end has a through hole in the radial direction and a rectangular groove on the right end face. The left end has a countersunk hole in the axial direction and a boss with a conical surface on the outer edge of the left end. The limiting pin 1204 is sleeved on the outside of the first valve core 1202 and cooperates with the limiting spring 1203.

[0038] Figure 5 This is a schematic diagram of the cap structure in this embodiment, as shown below. Figure 6 As shown, the pressure cap 1205 has external threads and internal through holes. It has a radial through hole at the right end and an annular groove at the through hole. It also has a tapered diameter reduction inside. The pressure cap 1205 is fixedly connected to the start valve mounting hole 201 of the body 5 by threads. The internal tapered surface cooperates with the limit pin 1204. The shear pin 1206 is a cylindrical pin that passes through the radial through hole of the split limit pin 1204 and the radial through hole of the pressure cap 1205, limiting the first valve core 1202 in the initial position.

[0039] The sliding engagement between the cylindrical stepped first valve core 1202 and the starting valve mounting hole 201 ensures smooth movement during high-pressure fluid propulsion. This, combined with the first sealing ring 1201, achieves a dynamic seal, preventing leakage of high-pressure fluid from the gap between the first valve core 1202 and the starting valve mounting hole 201. The conical engagement between the split-type limiting pin 1204 and the pressure cap 1205 achieves mechanical locking of the first valve core 1202 after reset, preventing abnormal high pressure from pushing the first valve core 1202 to move again and eliminating the risk of secondary setting. The limiting pin 1204 allows for precise setting of the setting start pressure by adjusting its specifications, adapting to the pressure requirements of different wellbore conditions and improving the packer's adaptability. The reset function of the limiting spring 1203 enables automatic reset of the first valve core after setting, cutting off the high-pressure fluid passage and forming a primary seal.

[0040] As an optional implementation method, Figure 7 yes Figure 2 Schematic diagram of the cross-sectional structure of the middle BB, as shown below. Figure 5 As shown, the one-way valve 13 includes a piston 1301, a return spring 1302, a second sealing ring 1303, and a plug 1304. The piston 1301 is slidably engaged with the body 5. The return spring 1302 abuts against the piston 1301 and the plug 1304. The plug 1304 is fixedly connected to the body 5 and the second sealing ring 1303 is provided at the engagement point with the body 5. High-pressure fluid pushes the piston 1301 to compress the return spring 1302 to open the passage. After depressurization, the return spring 1302 pushes the piston 1301 to close the passage.

[0041] Specifically, in this embodiment, the piston 1301 has a stepped structure with a smaller diameter at the left end and a larger diameter at the right end. A countersunk hole is provided on the right end face, which slides into the check valve mounting hole 202. The return spring 1302 is a cylindrical spring, installed in the countersunk hole at the right end of the piston. The plug 1304 has a thin cylindrical boss at the left end and a thread at the right end. A rectangular groove is provided at the left end of the thread, and a second sealing ring 1303 is installed in the groove. The thin cylindrical boss is inserted into the return spring 1302. The plug 1304 is fixedly connected to the check valve mounting hole 202 of the body 5 through the thread at the right end. The second sealing ring 1303 achieves a static seal between the plug 1304 and the body 5.

[0042] The stepped piston 1301 increases the contact area of ​​the high-pressure fluid, ensuring that it can easily push the piston 1301 to compress the return spring 1302 and open the passage. The automatic reset function of the return spring 1302 allows the piston 1301 to quickly return to its original position after pressurization stops, cutting off the backflow path of the high-pressure fluid and achieving unidirectional flow. This prevents backflow and leakage of high-pressure fluid within the rubber sleeve sealing assembly, forming a secondary seal. The fine cylindrical boss on the plug 1304 guides the return spring 1302, preventing it from tilting or jamming during compression / reset, thus improving the reliability of the check valve. The static sealing design of the second sealing ring 1303 prevents high-pressure fluid leakage from the connection between the plug 1304 and the body 5, ensuring the sealing performance of the check valve.

[0043] As an optional implementation method, Figure 8 yes Figure 2 A schematic diagram of the cross-sectional structure of the middle CC, as shown below. Figure 6 As shown, the locking valve 14 includes a third sealing ring 1401, a second valve core 1402, a shear sleeve 1403, a shear pin 1404, and a pressure cap 1405. The second valve core 1402 is slidably engaged with the body 5. The shear pin 1404 passes through the second valve core 1402 and the pressure cap 1405 to limit the second valve core 1402. After the second valve core 1402 is sheared by the thrust of the high-pressure fluid, it moves and blocks the high-pressure fluid passage.

[0044] In this embodiment, the left end and middle of the second valve core 1402 are designed with bosses, and a rectangular groove is provided between the two bosses. The third sealing ring 1401 is installed in the groove. The right end of the second valve core 1402 is provided with a radial through hole, which slides and engages with the locking valve mounting hole 203. The third sealing ring 1401 achieves dynamic sealing between itself and the locking valve mounting hole 203. The shear sleeve 1403 is a ring structure with a radial through hole in the middle, and is fitted over the outside of the second valve core 1402. The pressure cap 1405 has a through hole inside and a step, and is threaded on the outside. It is fixedly connected to the locking valve mounting hole 203 of the body 5 through the thread. The shear pin 1404 is a cylindrical pin that passes through the radial through hole at the right end of the second valve core 1402, the radial through hole of the shear sleeve 1403, and the through hole of the pressure cap 1405, limiting the second valve core 1402 to the initial position.

[0045] The second valve core 1402 with its double-protrusion structure, in conjunction with the third sealing ring 1401, achieves a highly efficient dynamic seal between the locking valve 14 and the locking valve mounting hole 203, preventing high-pressure fluid from leaking through the valve core gap and ensuring a sealing effect. The shear pin 1404, used for limiting, allows for precise setting of the setting and sealing termination pressure. When the pressure inside the rubber sleeve sealing assembly reaches the preset value, the second valve core 1402, under the thrust of the high-pressure fluid, shears off the shear pin 1404 and moves, precisely sealing the third transmission hole 103 of the high-pressure fluid channel, cutting off the path of the high-pressure fluid into the rubber sleeve sealing assembly, and preventing overpressure damage to the rubber sleeve. The shear sleeve 1403 guides the movement of the second valve core 1402, ensuring that the second valve core 1402 moves in a preset direction after shearing the shear pin 1404, accurately sealing the channel and improving the working accuracy of the locking valve 14; the stepped structure of the pressure cap 1405 limits the movement of the second valve core 1402, preventing excessive movement of the second valve core 1402 and structural damage, thereby improving the structural stability of the locking valve 14.

[0046] As an optional implementation method, such as Figure 1 and Figure 2 As shown, in this embodiment, the upper shoulder 7 is a cylindrical structure with its inner diameter gradually increasing from the inside to the outside at the right end. Its left end is fixedly connected to the right end of the main body 5, and its right end is connected to the left end of the rubber sleeve 8. The rubber sleeve 8 is made of elastic rubber material, possessing good elasticity and radial expansion capability. It is a long cylindrical structure suitable for the sealing requirements of open-hole well walls. The lower shoulder 10 is also a cylindrical structure with its inner diameter gradually increasing from the inside to the outside at the left end. Its right end is connected to the right end of the rubber sleeve 8. It has multiple rectangular grooves inside and is fitted onto the outside of the connecting sleeve 9, forming a sliding fit with the connecting sleeve 9.

[0047] In this embodiment, the rubber sleeve 8 is connected to the upper shoulder 7 and the lower shoulder 10 using a vulcanization process. The upper shoulder 7 is welded to the right end of the body 5. When the rubber sleeve 8 expands radially, the lower shoulder 10 can slide on the connecting sleeve 9. Furthermore, the rectangular groove inside the lower shoulder 10 is a sealing groove containing a sealing element. The sealing element is used to seal the sliding parts between the lower shoulder 10 and the isolation assembly. The lower shoulder 10 and the sealing element can slide on the connecting sleeve 9.

[0048] As an optional implementation, the connecting sleeve 9 and the lower sealing cylinder 11 can be connected to the annular isolation tool to control the opening and closing of the sand-proof filling channel.

[0049] In this embodiment, the right end of the connecting sleeve 9 is provided with a standardized connecting thread, the right end of the sealing surface of the lower sealing cylinder 11 is a standardized mating surface, the left end of the annular isolation tool is provided with a female thread that matches the connecting sleeve 9 and a sealing groove that matches the lower sealing cylinder 11, the connecting sleeve 9 is threadedly connected to the annular isolation tool, the sealing surface of the lower sealing cylinder 11 is precisely mated with the sealing groove of the annular isolation tool, and the opening and closing of the sand filling channel is realized through the valve structure inside the annular isolation tool.

[0050] The working principle of this embodiment is as follows: like Figure 9 and Figure 10 As shown, when the packer is pressurized, high-pressure fluid enters the bottom of the first valve core 1202 of the start valve 12 through the inlet port 100 inside the body 5. The first valve core 1202 transmits thrust to the limit pin 1204 and the shear pin 1206. When the fluid pressure is high enough, the generated thrust shears the shear pin 1206, the first valve core 1202 moves upward, and the high-pressure fluid enters the bottom of the single-flow valve 13 through the first transmission port 101. The high-pressure fluid pushes the piston 1301 upward, and the high-pressure fluid enters the annular space formed by the second valve core 1402 and the body 5 through the fourth transmission port 104. Then, it enters the cavity between the rubber sleeve assembly and the connecting casing 9 through the third transmission port 103. As the pressure inside the cavity increases, the rubber sleeve 8 expands radially until it is tightly attached to the well wall. At the same time, the lower shoulder 10 connects... The high-pressure fluid slides to the left on the connecting sleeve 9 and enters the cavity of the rubber sleeve assembly and connecting sleeve 9. It contacts the bottom of the second valve core 1402 through the second transmission hole 102. Under the same hydraulic pressure, the second valve core 1402 is subjected to an upward thrust greater than a downward thrust. When the resultant force of the two is greater than the shearing force of the shear pin 1404, the shear pin 1404 is cut off, and the second valve core 1402 moves upward to block the third transmission hole 103. The external high-pressure fluid no longer enters the cavity of the rubber sleeve assembly and connecting sleeve 9, and the packer completes the setting seal. When pressurization stops, the piston 1301 in the check valve 13 cuts off the communication channel between the first transmission hole 101 and the fourth transmission hole 104 under the restoring force of the return spring 1302. The first valve core 1202 in the start valve 12 cuts off the communication channel between the first transmission hole 101 and the bottom of the mounting hole of the check valve 13 under the restoring force of the limit spring 1203. Under the restoring force of the limit spring 1203, the outer conical surface of the split support leg of the limit pin 1204 contacts the inner conical surface of the start valve cap 1205 and undergoes compression deformation. At this time, the right end step of the first valve core 1202 contacts the left end face of the limit pin 1204 and restricts the first valve core 1202 from moving to the right. When abnormal pressure occurs inside the packer, the high-pressure fluid cannot enter the start valve 12, effectively preventing the packer from being damaged by abnormal pressure.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A naked-eye multi-channel packer with multiple sealing mechanisms, characterized in that, This includes the isolation assembly, valve system, and rubber sleeve seal assembly, among which: The isolation assembly includes a body, which has interconnected high-pressure fluid channels and sand-proof filling channels isolated from the high-pressure fluid channels. The valve system includes a start valve, a check valve, and a lock valve. The start valve, the check valve, and the lock valve are all assembled on the body and connected in sequence to the high-pressure fluid channel. The start valve is used to control the setting seal to start, the check valve is used to allow unidirectional flow of high-pressure fluid, and the lock valve is used to control the setting seal to stop and block the passage. The rubber sleeve sealing assembly is connected to the body and communicates with the output end of the high-pressure fluid channel. High-pressure fluid enters the rubber sleeve sealing assembly through the valve system and the high-pressure fluid channel to drive its radial expansion and form a seal with the open hole well wall.

2. A naked-eye multi-channel packer with multiple sealing mechanisms according to claim 1, characterized in that, The high-pressure fluid channel includes a radially arranged inlet hole and an axially arranged transmission hole. The inlet hole is connected to the start valve, and the transmission hole is connected to the start valve, the single-flow valve, the locking valve, and the rubber sleeve sealing assembly.

3. A naked-eye multi-channel packer with multiple sealing mechanisms according to claim 1, characterized in that, The isolation assembly further includes an upper connector, a filling sleeve, an upper sealing cylinder, an upper sealing stub, a lower sealing stub, a connecting sleeve, and a lower sealing cylinder. The upper connector, the filling sleeve, the upper sealing cylinder, the upper sealing stub, the body, the lower sealing stub, the connecting sleeve, and the lower sealing cylinder are connected in sequence, wherein: The main body is provided with a crescent-shaped through hole. One end of the crescent-shaped through hole is connected to the annular cavity formed by the filling sleeve, the upper sealing cylinder, and the upper sealing short section. The other end of the crescent-shaped through hole is connected to the annular cavity formed by the lower sealing short section, the connecting sleeve, and the lower sealing cylinder, forming the sand-proof filling channel.

4. A naked-eye multi-channel packer with multiple sealing mechanisms according to any one of claims 1-3, characterized in that, The starting valve includes a first sealing ring, a first valve core, a limiting spring, a limiting pin, a pressure cap, and a shearing pin. The first valve core is slidably engaged with the body and sealed by the first sealing ring. The shearing pin passes through the limiting pin and the pressure cap to limit the first valve core. The limiting spring is sleeved on the first valve core and provides it with a reset force.

5. A naked-eye multi-channel packer with multiple sealing mechanisms according to any one of claims 1-3, characterized in that, The one-way valve includes a piston, a return spring, and a plug. The piston is slidably engaged with the body. The return spring abuts against the piston and the plug. The plug is fixedly connected to the body and a second sealing ring is provided at the engagement point with the body. High-pressure fluid pushes the piston to compress the return spring to open the passage. After depressurization, the return spring pushes the piston to close the passage.

6. A naked-eye multi-channel packer with multiple sealing mechanisms according to any one of claims 1-3, characterized in that, The locking valve includes a third sealing ring, a second valve core, a shear sleeve, a shear pin, and a pressure cap. The second valve core is slidably engaged with the body and sealed by the third sealing ring. The shear pin passes through the second valve core and the pressure cap to limit the second valve core. The second valve core can move after being sheared by the thrust of the high-pressure fluid to block the high-pressure fluid passage.

7. A naked-eye multi-channel packer with multiple sealing mechanisms according to claim 3, characterized in that, The rubber sleeve sealing assembly includes an upper shoulder, a rubber sleeve, and a lower shoulder, wherein: The two ends of the rubber tube are respectively connected to the upper shoulder and the lower shoulder. The upper shoulder is fixedly connected to the body, and the lower shoulder can slide axially on the connecting sleeve.

8. A naked-eye multi-channel packer with multiple sealing mechanisms according to claim 7, characterized in that, The lower shoulder has a sealing groove inside, and a sealing element is installed in the sealing groove. The sealing element is used to seal the sliding part between the lower shoulder and the isolation assembly.

9. A naked-eye multi-channel packer with multiple sealing mechanisms according to claim 7 or 8, characterized in that, The rubber sleeve, the upper shoulder guard, and the lower shoulder guard are all integrally connected through a vulcanization process, and the upper shoulder guard is welded and fixed to the body.

10. A naked-eye multi-channel packer with multiple sealing mechanisms according to claim 3, characterized in that, The connecting sleeve and the lower sealing cylinder can be connected to the annular isolation tool to control the opening and closing of the sand-proof filling channel.

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