Packing tool with sliding sleeve

Abstract

The invention discloses a packing tool with a sliding sleeve. The packing tool is composed of a setting mechanism, a reversing mechanism, a sliding sleeve mechanism and a tail plug which are sequentially connected from top to bottom. The setting mechanism comprises a pressing cap, a dragging cap, a setting rubber barrel, a rubber barrel gasket, a special-shaped support, a setting piston and a connecting barrel which are sequentially arranged on the outer side of the center pipe in a sleeving mode from top to bottom. The reversing mechanism comprises a reversing outer cylinder, and a triangular constraint rail is arranged on the inner wall of the reversing outer cylinder; the sliding sleeve mechanism comprises a sliding sleeve outer cylinder, a sliding sleeve inner cylinder, a sealing ring, a supporting bracket, a connecting cylinder, a piston cylinder, an unlocking piston and a plurality of positioning pins; the tail plug is plugged at the bottom end of the sliding sleeve mechanism; the tool is used for pressing for setting and lifting for unsetting, and has the functions of preventing midway setting and assisting in unsetting; according to the tool, a single-layer oil-gas layer and an inner channel of a tubular column are opened and closed through opening and closing of the packer and the sliding sleeve, so that the purpose of injecting fluid into the oil-gas layer through the tubular column or enabling fluid in the oil-gas layer to flow into the tubular column outwards is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole operations in oil and gas fields, and particularly to a packer tool with a built-in sliding sleeve. Background Art

[0002] With the in-depth development of oil and gas fields, the number of horizontal wells, especially those with long horizontal sections, is increasing. Such horizontal wells generally penetrate several oil and gas layers, thereby improving the oil and gas recovery rate. Currently, for the development of horizontal wells with multiple intervals, there are the following two problems: 1) After multi-stage fracturing of horizontal wells, multi-stage combined production is generally used for oil and gas production operations. In this way, it is impossible to know which interval produces more oil and which interval produces less oil. Traditional oil and gas testing methods are general tests, and only multi-stage combined production tests can be carried out according to the production method. It is impossible to achieve testing and production for a single interval, that is, it is impossible to achieve refined testing, resulting in geologists being unable to effectively judge the production of each interval, and thus unable to give an accurate development plan, affecting the utilization rate of reservoirs and ultimately the oil and gas recovery rate; 2) For some intervals, when single-interval cement injection and plugging operations are required, there is currently no good technical means to separate the single interval. The conventional method is to first lower a bridge plug, set and release the bridge plug, then remove the pipe string, and then lower an intubation tool to punch a hole in the bridge plug, and inject cement and plug the interval below the bridge plug through this hole. This operation has many processes and is cumbersome. Especially when the intubation tool inserts into the bridge plug, good centering needs to be ensured. For horizontal wells, it is very difficult to ensure centering, resulting in a low success rate of the operation. All in all, for multi-interval horizontal wells at present, if you want to conduct testing and production operations or cement injection and plugging operations for a single interval alone, there are problems such as limited implementation means, many operation processes, and low success rate, and there is a lack of corresponding high-performance packer tools that can both isolate a single layer and perform operations on a single layer, that is, meet the operation requirements of a single layer with one trip of the pipe string. Summary of the Invention

[0003] The purpose of the present invention is to provide a packer tool with a built-in sliding sleeve to solve the above technical problems.

[0004] To this end, the technical solution of the present invention is as follows:

[0005] A packer tool with a built-in sliding sleeve is composed of a setting mechanism, a reversing mechanism, a sliding sleeve mechanism, and a tail plug connected in sequence from top to bottom; wherein,

[0006] The setting-down mechanism includes a pressure cap, a dragging cap, a setting-down rubber cylinder, a rubber cylinder gasket, a special-shaped support, a setting-down piston and a connecting cylinder, which are sleeved on the outside of the central tube in sequence from top to bottom; a communication hole is opened in the side wall of one side of the central tube, which is composed of an upper radial communication hole, an axial communication hole and a lower radial communication hole connected in sequence, and the upper radial communication hole and the lower radial communication hole are communicated with the outside of the central tube; a slotted hole and a restraint block are respectively arranged on the upper and lower parts of the side wall of the other side of the central tube, the slotted hole is a strip-shaped hole opened along the axial direction of the central tube and there are multiple slotted holes, and they are arranged at intervals in the circumferential direction; the restraint block is vertically fixed on the outer wall of the central tube; the pressure cap is sleeved and fixed on the top side of the central tube, and an outer discharge check valve and an inner pressure check valve are respectively arranged along the radial direction at the same height on its side wall, the included angle formed by the axial directions of the two is 90°, and the outer discharge check valve is initially communicated with the upper radial communication hole of the communication hole; the dragging cap is sleeved on the outside of the central tube and is arranged at intervals below the pressure cap; the setting-down piston is sleeved on the outside of the central tube, its top end is fixed at the bottom end of the dragging cap, the outer diameter of its bottom end gradually increases from top to bottom and forms an upper annular step and a lower annular step in sequence, and a plurality of pressure transmission holes are uniformly arranged on the side wall between the upper annular step and the lower annular step in the circumferential direction, and an annular groove communicating with a plurality of pressure transmission holes and a plurality of slotted holes is opened on its inner wall; the setting-down rubber cylinder, the rubber cylinder gasket and the special-shaped support are sleeved on the outside of the setting-down piston in sequence from top to bottom, and the special-shaped support is press-fitted on the upper annular step of the setting-down piston; the connecting cylinder is sleeved on the outside of the central tube in a manner that there is an annular space gap, and its top end is fixed at the bottom end of the special-shaped support; the setting-down piston can move in the annular space gap, and the annular space gap is separated by the lower annular step at the bottom end of the setting-down piston into a first annular space and a second annular space located on the upper and lower sides respectively, a plurality of pressure transmission holes are communicated with the first annular space, and the lower radial communication hole is communicated with the annular space gap and the second annular space;

[0007] The commutation mechanism includes a commutation outer cylinder sleeved on the outside of the central tube and fixed at the bottom end of the connecting cylinder; a restraint track is opened on the inner wall of the commutation outer cylinder, which is a triangular track formed by connecting an axial track, a lower oblique track and an upper oblique track end to end in sequence, and the arc span of the triangular track in the circumferential direction is 90°; the restraint block is initially embedded on the top side of the axial track; the opening positions of the lower oblique track and the upper oblique track satisfy that when the restraint block slides to the bottom side of the axial track and slides upward along the lower oblique track to the intersection point with the upper oblique track, the central tube rotates accordingly so that the upper radial hole of the communication hole is communicated with the inner pressure check valve, and when the restraint block slides along the upper oblique track and returns to the top side of the axial track, the central tube rotates back so that the upper radial hole of the communication hole is communicated with the outer discharge check valve;

[0008] The sliding sleeve mechanism includes a sliding sleeve outer cylinder, a sliding sleeve inner cylinder, a sealing ring, a support bracket, a connecting sleeve, a piston cylinder, an unlocking piston, and a plurality of positioning pins; the sliding sleeve inner cylinder is composed of a large-diameter cylinder body and a small-diameter cylinder body connected in sequence from top to bottom, and annular steps are formed on the outer wall and inner wall at the connection of the two; the sliding sleeve outer cylinder is sleeved outside the large-diameter cylinder body, and their tops are respectively fixed to the bottom of the reversing outer cylinder and the center pipe; four inner through holes are evenly distributed along the circumferential direction on the side wall of the large-diameter cylinder body, and four outer through holes with the same shape and size as the inner through holes are evenly distributed along the circumferential direction on the lower side wall of the sliding sleeve outer cylinder, and the four outer through holes are respectively located directly below the four inner through holes; the sealing ring and the support bracket are sequentially sleeved from top to bottom in the annular space formed between the sliding sleeve outer cylinder and the small-diameter cylinder body, and the sealing ring is located between the outer through hole and the inner through hole; the piston cylinder is sleeved outside the connecting sleeve, and its top is fixed to the outer wall of the connecting sleeve by a plurality of pins evenly distributed along the circumferential direction; the lower joint is sleeved inside the piston cylinder in a manner that there is an annular space, and a third annular space is formed between the two through the annular boss on the inner wall of the bottom end of the piston cylinder. The lower joint is fixed to the piston cylinder by a plurality of pins evenly distributed along the circumferential direction on the annular boss; the unlocking piston is sleeved in the third annular space in a manner that there is a gap between its top end and the bottom end of the connecting sleeve, and it is fixed to the piston cylinder by a plurality of pins evenly distributed along the circumferential direction; a plurality of positioning pins are respectively passed through a plurality of T-shaped pin holes opened on the side wall of the top end of the lower joint through compression springs sleeved on them. The outer ends of the positioning pins abut against the inner wall of the unlocking piston, and the inner ends abut against the bottom surface of the sliding sleeve inner cylinder, and the T-shaped pin holes communicate with the unlocking piston; the tail plug is fixed to the bottom end of the lower joint and seals the bottom opening thereof.

[0009] Furthermore, the packer tool with a built-in sliding sleeve further includes an upper joint having a cylindrical cylinder structure. The inner wall of the top end of the upper joint is provided with an internal connection thread that mates with the external connection thread at the bottom end of the tubing. The outer wall of its bottom end is provided with an external connection thread that mates with the internal connection thread on the inner wall of the top end of the compression cap. The inner wall of its bottom end is provided with an internal connection thread that mates with the external connection thread on the outer wall of the top side of the central shaft.

[0010] Further, the outer discharge check valve includes an outer discharge check passage radially opened on the side wall of the compression cap, and the inner diameter of the outer passage of the outer discharge check valve is larger than that of the inner passage, so that an annular setting step is formed on the inner wall of the passage; a check ball is arranged in the inner passage of the outer discharge check passage, and an over-flow plug sleeve is sleeved and fixed on the inner wall of the outer passage of the outer discharge check valve, so that the check ball is limited to roll back and forth between the over-flow plug sleeve and the annular setting step; the inner pressure check valve includes an inner pressure check passage radially opened on the side wall of the compression cap, and the inner diameter of the outer passage of the inner pressure check valve is larger than that of the inner passage, so that an annular step is formed on the inner wall of the passage; an inner pressure spring and a check ball are sequentially arranged from inside to outside in the inner passage of the inner pressure check passage, and an over-flow plug sleeve is sleeved and fixed on the inner wall of the outer passage of the inner pressure check valve, so that the check ball is limited to roll back and forth between the over-flow plug sleeve and the inner pressure spring, and two ends of the inner pressure spring respectively abut against the annular step and the check ball.

[0011] Further, the setting rubber cylinder includes a plurality of rubber cylinders, and an intermediate gasket is arranged between every two adjacent setting rubber cylinders, and a rubber cylinder support is arranged below the rubber cylinder at the bottom end.

[0012] Further, the top surface of the rubber cylinder at the top side is processed with an upper arc surface, and the bottom surface of the dragging cap is processed into an inner concave arc surface capable of fitting and cooperating with the upper arc surface of the rubber cylinder; the bottom surface of the rubber cylinder at the bottom side is processed with a lower arc surface, and the rubber cylinder support is processed into a conical cylinder body cooperating with the lower arc surface of the rubber cylinder; an arc-shaped groove cooperating with the bottom end of the rubber cylinder support is centrally opened on the top surface of the rubber cylinder gasket, and a conical deep groove is centrally opened on the bottom surface of the rubber cylinder gasket; the top end of the special-shaped support is a conical end, and the conical end cooperates with the conical deep groove opened on the bottom surface of the rubber cylinder gasket, so that the special-shaped support and the rubber cylinder gasket are inserted and connected.

[0013] Further, both the depth and width of the constraint track are larger than the length and diameter of the constraint block on the central pipe.

[0014] Further, an outer annular groove is opened on the outer wall of the unlocking piston, an inner annular groove is opened on the inner wall of the piston cylinder, and a retaining snap ring is embedded in the inner annular groove; the opening position of the inner annular groove on the inner wall of the piston cylinder satisfies that when the unlocking piston descends to the bottom of the third annular space, it is aligned with the outer annular groove on the outer wall of the unlocking piston, so that the retaining snap ring is simultaneously embedded in the outer annular groove and the inner annular groove.

[0015] Further, the outer diameter of the outer side of the T-shaped pin hole opened on the side wall at the top end of the lower joint is larger than that of the inner side, so that an annular step is formed on the inner wall of the T-shaped pin hole; the positioning pin is a pin body with an annular boss on the outer wall of one end, and the outer diameter of the annular boss end of the positioning pin is larger than the outer diameter of the outer side of the T-shaped pin hole, so that the other end of the annular boss end abuts against the outer wall of the lower joint, and the outer diameter of the spring sleeved on the positioning pin is adapted to the outer diameter of the outer side of the T-shaped pin hole, so that two ends of the spring respectively abut against the annular boss on the positioning pin and the annular step on the inner wall of the T-shaped pin hole.

[0016] Further, a seal is formed between the compression cap and the central tube through a double - seal ring provided on the inner wall of the top end of the compression cap; a seal is formed between the special - shaped support and the setting piston through a double - seal ring provided on the inner wall of the special - shaped support; a seal is formed between the setting piston and the connecting cylinder through a double - seal ring provided on the outer wall of the lower annular step of the setting piston; a seal is formed between the setting piston and the central tube through a double - seal ring provided on the inner wall of the bottom end of the setting piston; a seal is formed between the bottom end of the connecting cylinder and the central tube through a double - seal ring provided on the inner wall of the bottom end of the connecting cylinder.

[0017] Further, a seal is formed between the lower side of the connecting sleeve and the small - diameter cylinder through a double - seal ring provided on the inner wall of the lower side of the connecting sleeve; a seal is formed between the lower side of the connecting sleeve and the piston cylinder through a double - seal ring provided on the outer wall of the lower side of the connecting sleeve; a seal is formed between the unlocking piston and the lower joint respectively through a double - seal ring provided on the upper side of the inner wall of the annular boss of the unlocking piston; a seal is formed between the unlocking piston and the piston cylinder through a double - seal ring provided on the outer wall of the unlocking piston.

[0018] Compared with the prior art, the packer tool with a built - in sliding sleeve is set by pressure and released by pulling up, which can prevent premature setting, has an auxiliary release function, is simple to operate, stable in work, excellent in performance, and meets the operation requirements of a single - layer operation with one trip of the pipe string; through the opening and closing of the packer and the sliding sleeve, the tool realizes the opening and closing of the single - layer oil and gas layer and the internal channel of the pipe string, so as to achieve the purpose of injecting fluid into the oil and gas layer or flowing the fluid of the oil and gas layer into the pipe string through the pipe string. Therefore, operations such as testing and production of the oil and gas layer or cement injection and plugging can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a full - sectional view of the packer tool with a built - in sliding sleeve of the present invention before setting (state before setting);

[0020] Figure 2 is a schematic connection structure diagram of the upper joint, setting mechanism and reversing mechanism of the packer tool with a built - in sliding sleeve of the present invention;

[0021] Figure 3 is a schematic connection structure diagram of the sliding sleeve mechanism and the tail plug of the packer tool with a built - in sliding sleeve of the present invention;

[0022] Figure 4 is a top view of the packer tool with a built - in sliding sleeve of the present invention;

[0023] Figure 5 is a full - sectional view of the packer tool with a built - in sliding sleeve of the present invention after setting;

[0024] Figure 6 is a full - sectional view of the packer tool with a built - in sliding sleeve of the present invention in the state where the sliding sleeve is open;

[0025] Figure 7 Full sectional view of the packer tool with a built-in sliding sleeve of the present invention in the state of being lifted to release and the sliding sleeve being closed;

[0026] Figure 8 Three-dimensional view of the compression cap of the packer tool with a built-in sliding sleeve of the present invention;

[0027] Figure 9 Full sectional view of the special-shaped support of the packer tool with a built-in sliding sleeve of the present invention;

[0028] Figure 10 Full sectional view of the setting piston of the packer tool with a built-in sliding sleeve of the present invention;

[0029] Figure 11 Three-dimensional view of the central shaft of the packer tool with a built-in sliding sleeve of the present invention;

[0030] Figure 12 Full sectional view of the central shaft of the packer tool with a built-in sliding sleeve of the present invention;

[0031] Figure 13 Full sectional view of the outer sleeve for changing direction of the packer tool with a built-in sliding sleeve of the present invention;

[0032] Figure 14 Three-dimensional view of the outer sliding sleeve of the packer tool with a built-in sliding sleeve of the present invention;

[0033] Figure 15 Full sectional view of the outer sliding sleeve of the packer tool with a built-in sliding sleeve of the present invention;

[0034] Figure 16 Three-dimensional view of the inner sliding sleeve of the packer tool with a built-in sliding sleeve of the present invention;

[0035] Figure 17 Full sectional view of the inner sliding sleeve of the packer tool with a built-in sliding sleeve of the present invention;

[0036] Figure 18 Full sectional view of the lower sub of the packer tool with a built-in sliding sleeve of the present invention;

[0037] Figure 19 Full sectional view of the positioning pin of the packer tool with a built-in sliding sleeve of the present invention;

[0038] Figure 20 Schematic diagram of the connection structure of the sliding sleeve mechanism and the tail plug of the packer tool with a built-in sliding sleeve of the present invention in the state of the sliding sleeve being open;

[0039] Figure 21 is Figure 3 Partial enlarged view at C of;

[0040] Figure 22 is Figure 5Partial enlarged view at D;

[0041] Figure 23 is Figure 7 Partial enlarged view at E;

[0042] Figure 24 Schematic diagram of the packer tool with a built-in sliding sleeve of the present invention in the well. Detailed implementation manners

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means any limitation to the present invention.

[0044] Refer to Figure 1 , the packer tool with a built-in sliding sleeve is composed of an upper joint 1, a setting mechanism 2, a reversing mechanism 3, a sliding sleeve mechanism 4 and a tail plug 5, which are connected in sequence from top to bottom.

[0045] The upper joint 1 is a cylindrical barrel structure; there is a connecting internal thread on the inner wall of the top end of the upper joint 1, specifically 3-1 / 2" flush tubing male thread, for connecting a coiled tubing or a tubing and other conveying pipe strings to convey the packer tool with a built-in sliding sleeve to a designated downhole packing position; there are a connecting external thread and a connecting internal thread on the outer wall and the inner wall of the bottom end of the upper joint 1 respectively, for being threadedly connected and fixed with the setting mechanism 2 as a whole.

[0046] Refer to Figure 2 , the setting mechanism 2 is the main mechanism for realizing interval packing, and it includes a compression cap 2-1, a drag cap 2-3, a setting rubber cylinder, a rubber cylinder gasket 2-7, a special-shaped support 2-8, a setting piston 2-9 and a connecting cylinder 2-10 sleeved outside the central tube 2-2; specifically,

[0047] Refer to Figure 2 , the central tube 2-2 is a long cylindrical tube body, and there are a double seal ring and a connecting external thread on the outer wall of the top end of the central tube 2-2 from top to bottom, so that the top end of the central tube 2-2 is sealed and inserted into the bottom end of the upper joint 1, and a seal is formed between the central tube 2-2 and the upper joint 1, and at the same time the central tube 2-2 is threadedly connected and fixed with the upper joint 1 as a whole; a communication hole 2-2-1 for communicating the upper and lower spaces of the rubber cylinder 2-4 is opened in one side side wall of the central tube 2-2, which is composed of an upper radial communication hole, an axial communication hole and a lower radial communication hole connected in sequence, and the upper radial communication hole and the lower radial communication hole communicate with the outside of the central tube; Refer to Figure 11 and Figure 12, on the upper and lower parts of the side wall of the central tube 2-2 on the opposite side of the communication channel 2-2-1, there are respectively slotted holes 2-2-2 and restraint blocks 2-2-3; among them, the slotted holes 2-2-2 are strip-shaped holes opened along the axial direction of the central tube 2-2 and there are several (specifically 2 to 6), and several slotted holes 2-2-2 are formed by wire cutting and are circumferentially spaced; the restraint blocks 2-2-3 are cylindrical structures, which are vertically welded and fixed on the outer wall of the central tube 2-2, and are used to cooperate with the commutation mechanism 3.

[0048] See Figure 8 , the compression cap 2-1 is a cylindrical barrel structure, and on the inner wall of its top end, there is a connecting internal thread that matches the external thread at the bottom end of the upper joint 1, so that the setting mechanism 2 is connected and fixed to the upper joint 1 in a coaxial manner with the upper joint 1; See Figure 5 and Figure 6 , on the side walls of the compression cap 2-1 at the same height, there are respectively arranged an external discharge check valve 2-1-1 and an internal pressure check valve 2-1-2 along the radial direction, and the included angle formed by the axial directions of the two is 90°; specifically, see Figure 4 and Figure 22 , the external discharge check valve 2-1-1 includes an external discharge check valve channel opened along the radial direction on the side wall of the compression cap 2-1, and the inner diameter of the outer channel is larger than that of the inner channel, so that an annular setting step is formed on the inner wall of the channel; in the inner channel of the external discharge check valve channel, there is a check ball 2-1-1-2, and on the inner wall of the outer channel, there is a flow-through plug sleeve 2-1-1-1 sleeved and fixed, so that the check ball 2-1-1-2 is limited to roll back and forth between the flow-through plug sleeve 2-1-1-1 and the annular setting step; the external discharge check valve 2-1-1 can use the internal hydraulic action to push the check ball 2-1-1-2 to roll towards the flow-through plug sleeve 2-1-1-1, so that the liquid is discharged from the inside to the outside; See Figure 4 and Figure 23 , the internal pressure check valve 2-1-2 includes an internal pressure check valve channel opened along the radial direction on the side wall of the compression cap 2-1, and the inner diameter of the outer channel is larger than that of the inner channel, so that an annular step is formed on the inner wall of the channel; in the inner channel of the internal pressure check valve channel, there are sequentially arranged an internal pressure spring 2-1-2-1 and a check ball 2-1-1-2 from the inside to the outside, and on the inner wall of the outer channel, there is a flow-through plug sleeve 2-1-1-1 sleeved and fixed, so that the check ball 2-1-1-2 is limited to roll back and forth between the flow-through plug sleeve 2-1-1-1 and the internal pressure spring 2-1-2-1, and both ends of the internal pressure spring 2-1-2-1 are respectively abutted against the annular step and the check ball 2-1-1-2; the internal pressure check valve 2-1-2 can use the external hydraulic action to push the check ball 2-1-1-2 to roll away from the flow-through plug sleeve 2-1-1-1, so that the liquid flows in from the outside to the inside; the external discharge check valve 2-1-1 is initially connected to the upper radial communication hole of the communication channel 2-2-1;

[0049] The dragging cap 2-3 is sleeved outside the central tube 2-2 and is arranged at intervals below the compression cap 2-1. A double-seal ring is provided on the inner wall of the top end to form a seal between it and the outer wall of the central tube 2-2. An internal connecting thread is provided on the inner wall of the bottom end of the dragging cap 2-3.

[0050] See Figure 10 , the setting piston 2-9 is sleeved outside the central tube 2-2. The top end is threadedly connected to the inner wall of the bottom end of the dragging cap 2-3 through an external connecting thread provided on the outer wall of the top end. The outer diameter of the bottom end gradually increases from top to bottom to form an upper annular step and a lower annular step in sequence. Four pressure transmission holes 2-9-1 are evenly arranged in the circumferential direction on the side wall between the upper annular step and the lower annular step; an annular groove is provided on the inner wall below the setting piston 2-9, and the annular groove is respectively communicated with the four pressure transmission holes 2-9-1 and the two slotted holes 2-2-2.

[0051] The setting rubber cylinder, the rubber cylinder gasket 2-7 and the special-shaped support 2-8 are sleeved outside the setting piston 2-9 from top to bottom in sequence; among them, the setting rubber cylinder includes two rubber cylinders 2-4, an intermediate gasket 2-5 arranged between the two rubber cylinders 2-4, and a rubber cylinder support 2-6 located at the bottom side of the lower rubber cylinder 2-4; as a preferred technical solution of this embodiment, the rubber cylinder 2-4 is a rubber cylinder with an arc surface processed on one end surface, and the upper rubber cylinder 2-4 is arranged with the arc surface facing up. Correspondingly, the bottom surface of the dragging cap 2-3 is processed into an inner concave arc surface that can fit with the arc surface on the rubber cylinder 2-4, so that the top end of the upper rubber cylinder 2-4 abuts against the bottom surface of the dragging cap 2-3 in an arc surface fitting manner; the lower rubber cylinder 2-4 is arranged with the arc surface facing down. Correspondingly, the rubber cylinder support 2-6 is processed into a conical cylinder body that fits with the lower arc surface of the rubber cylinder 2-4, so that the bottom end of the lower rubber cylinder 2-4 is press-fitted on the rubber cylinder support 2-6 in an arc surface fitting manner; an arc-shaped groove matching the bottom end of the rubber cylinder support 2-6 is provided in the center of the top surface of the rubber cylinder gasket 2-7, and a conical deep groove is provided in the center of the bottom surface; See Figure 9 , the top end of the special-shaped support 2-8 is a conical end, and the conical end fits with the conical deep groove provided on the bottom surface of the rubber cylinder gasket 2-7, so that the special-shaped support 2-8 and the rubber cylinder gasket 2-7 are inserted and connected; the structural cooperation design among the rubber cylinder assembly, the rubber cylinder gasket 2-7 and the special-shaped support 2-8 can not only improve the overall support stability of the rubber cylinder assembly, avoid radial misalignment when the rubber cylinder assembly is compressed, but also prevent the problem that the rubber cylinder 2-4 cannot return to its original shape due to excessive deformation; an annular boss is provided on the outer wall of the middle part of the special-shaped support 2-8, and its bottom end is press-fitted on the upper annular step of the setting piston 2-9, and an external connecting thread is provided on its outer wall; in addition, a seal is formed between the special-shaped support 2-8 and the setting piston 2-9 through a double-seal ring provided on the inner wall of the special-shaped support 2-8.

[0052] The connecting cylinder 2-10 is a cylinder sleeved outside the central tube 2-2. Its inner wall gradually increases from top to bottom and is formed with a first inner annular step, a second inner annular step, and a third inner annular step. The outer wall of its bottom end contracts inward to form an outer limit step, and an external connecting thread is provided on the outer wall of the bottom end. Among them,

[0053] The top end of the connecting cylinder 2-10 is threadedly connected to the outer wall of the bottom end of the special-shaped support 2-8 through the connecting internal thread provided on the inner wall of the top end. The outer diameter of the lower annular step at the bottom end of the setting piston 2-9 is adapted to the inner diameter of the connecting cylinder 2-10, so that the special-shaped support 2-8, the connecting cylinder 2-10, and the setting piston 2-9 enclose a first annular space, and the first annular space is communicated with a plurality of pressure transmission holes 2-9-1, so that the high-pressure fluid in the central tube 2-2 sequentially passes through the slotted holes 2-2-2, the annular groove on the inner wall of the setting piston 2-9, and the pressure transmission holes 2-9-1 and enters the first annular space. In order to ensure the sealing performance of the first annular space, a double seal ring is provided between the setting piston 2-9 and the central tube 2-2 on the inner wall of the bottom end of the setting piston 2-9 to form a seal, and a double seal ring is provided between the setting piston 2-9 and the connecting cylinder 2-10 on the outer wall of the lower annular step of the setting piston 2-9 to form a seal;

[0054] The inner diameter of the bottom end of the connecting cylinder 2-10 is adapted to the outer diameter of the central tube 2-2, so that the setting piston 2-9, the connecting cylinder 2-10, and the central tube 2-2 enclose a second annular space, and the lower radial communication hole of the communication hole 2-2-1 is opposite to the inner wall below the first inner annular step, so that the second annular space is communicated with the lower radial communication hole of the communication hole 2-2-1. In order to ensure the sealing performance of the second annular space, a double seal ring is provided between the bottom end of the connecting cylinder 2-10 and the central tube 2-2 on the inner wall of the bottom end of the connecting cylinder 2-10 to form a seal.

[0055] See Figure 13 As shown in, the reversing mechanism 3 includes a reversing outer cylinder 3-1; the reversing outer cylinder 3-1 is sleeved outside the central tube 2-2. A connecting internal thread is provided on the inner wall of its top end, so that the top side of the reversing outer cylinder 3-1 is threadedly connected to the outer wall of the bottom end of the connecting cylinder 2-10, and the top end of the reversing outer cylinder 3-1 abuts against the lower end surface of the outer limit step at the bottom end of the connecting cylinder 2-10. The outer wall of the bottom end of the reversing outer cylinder 3-1 contracts inward to form a lower limit step, and an external connecting thread is provided on the outer wall of the bottom end;

[0056] On the inner wall of one side of the outer cylinder for reversing 3-1, a constraint track 3-2 is provided. It is a triangular track formed by sequentially connecting the axial track 3-2-1, the lower inclined track 3-2-2, and the upper inclined track 3-2-3 end to end. And the arc span of the triangular track in the circumferential direction is 90°; that is, from the lowest point of the axial track 3-2-1, it ascends along the lower inclined track 3-2-2 with an arc angle of 90° to reach the highest point of the lower inclined track 3-2-2, which is also the lowest point of the upper inclined track 3-2-3, and then continues to ascend along the upper inclined track 3-2-3 with an arc angle of 90° to reach the highest point of the upper inclined track 3-2-3, which is also the highest point of the axial track 3-2-1; the axial track 3-2-1 is provided in the axial direction of the outer cylinder for reversing 3-1 and is located on the symmetric side of the outer single-flow valve 2-1-1. The highest point of the lower inclined track 3-2-2 (which is also the lowest point of the upper inclined track 3-2-3) is located on the center line of the inner pressure single-flow valve 2-1-2; the opening position of the constraint track 3-2 is adapted to the setting position of the constraint block 2-2-3 on the central tube 2-2, so that the constraint block 2-2-3 is initially located at the highest point of the axial track 3-2-1; the depth and width of the constraint track 3-2 are both greater than the length and diameter of the constraint block 2-2-3 on the central tube 2-2.

[0057] See Figure 6 and Figure 7 , the opening positions of the lower inclined track 3-2-2 and the upper inclined track 3-2-3 satisfy that when the constraint block 2-2-3 slides to the bottom side of the axial track 3-2-1 and ascends along the lower inclined track 3-2-2 to slide to its intersection with the upper inclined track 3-2-3, the central tube 2-2 rotates accordingly so that the upper radial hole of the communication hole 2-2-1 is communicated with the inner pressure single-flow valve 2-1-2, and when the constraint block 2-2-3 slides along the upper inclined track 3-2-3 and returns to the top side of the axial track 3-2-1, the central tube 2-2 rotates back so that the upper radial hole of the communication hole 2-2-1 is communicated with the outer single-flow valve 2-1-1.

[0058] The installation method of the upper joint 1, the setting mechanism 2, and the reversing mechanism 3 is as follows: First, insert one end of the central tube 2-2 with the restraint block 2-2-3 into the outer reversing cylinder 3-1, so that the restraint block 2-2-3 enters the vertical track 3-2-1 of the restraint track 3-2 and is placed at the highest point thereof; Second, slip the connecting cylinder 2-10 onto the upper end of the central tube 2-2, thread it to the outer reversing cylinder 3-1, then slip the setting piston 2-9 onto it, and insert the piston body downward into the annular space formed by the connecting cylinder 2-10 and the central tube 2-2. Slip the special-shaped support 2-8 onto it and thread it to the connecting cylinder 2-10 to form the second annular space, that is, the piston chamber; Then, slip the rubber cylinder gasket 2-7, the rubber cylinder support 2-6, the inverted rubber cylinder 2-4, the intermediate gasket 2-5, the upright rubber cylinder 2-4, and the drag cap 2-3 onto the upper end of the central tube 2-2 in sequence. The drag cap 2-3 is thread-connected to the upper end of the setting piston 2-9; Finally, slip the compression cap 2-1 onto the upper end of the central tube 2-2, adjust the direction so that the upper water port of the central tube 2-2 is aligned with the water port of the outer discharge check valve 2-1-1. Slip the upper joint 1 onto the upper end of the central tube 2-2 and thread-connect the central tube 2-2 and the compression cap 2-1 to complete the assembly of the upper joint 1, the setting mechanism 2, and the reversing mechanism 3.

[0059] The working principle of the setting mechanism 2 is as follows: After the entire tool is assembled, it is conveyed to the predetermined position in the wellbore through the coiled tubing or tubing connected to the top side of the upper joint 1. At this time, the piston body of the setting piston 2-9 abuts against the bottom of the special-shaped support 2-8, and the slotted hole 2-2-2 communicates with the pressure transmission hole 2-9-1 through the first annular space formed by the enlarged diameter part at the bottom end of the setting piston 2-9, that is, the upper space of the setting piston 2-9 communicates with the inner cavity of the central tube 2-2. At the same time, the restraint block 2-2-3 of the central tube 2-2 is initially located at the highest point of the vertical track 3-2-1; When the tool reaches the predetermined position and needs to be set, pressure is applied to the tool through the conveying string. The high-pressure fluid enters the inner cavity of the central tube 2-2. Since the bottom of the entire tool is blocked by the tail plug 5, the high-pressure fluid will enter the pressure transmission hole 2-9-1 through the slotted hole 2-2-2, then enter the first annular space and act on the annular step surface of the setting piston 2-9, pushing the setting piston 2-9 to move downward in the second annular space (i.e., the piston chamber), squeezing the liquid in the second annular space (i.e., the piston chamber) to enter the wellbore through the communication hole 2-2-1 and the outer discharge check valve 2-1-1, while the fluid in the wellbore cannot enter the inner cavity of the tool through the outer discharge check valve 2-1-1; Therefore, while the setting piston 2-9 moves downward in the piston chamber, it drives the top drag cap 2-3 to move downward along the axis of the central tube 2-2, squeezing the rubber cylinder 2-4 to expand and deform until it contacts the wellbore, thus completing the setting and isolating the wellbore.

[0060] See Figure 3, the sliding sleeve mechanism 4 includes a sliding sleeve outer cylinder 4-1, a sliding sleeve inner cylinder 4-2, a sealing ring 4-3, a support bracket 4-4, a connecting sleeve 4-5, a piston cylinder 4-6, an unlocking piston 4-7 and a plurality of positioning pins 4-8; among them,

[0061] See Figure 14 and Figure 15 , the sliding sleeve outer cylinder 4-1 is a cylindrical barrel, and the inner wall of its top end is provided with a connecting internal thread, so that the top end of the sliding sleeve outer cylinder 4-1 is threadedly connected to the bottom outer wall of the reversing outer cylinder 3-1; the inner wall of the bottom end of the sliding sleeve outer cylinder 4-1 is provided with a connecting internal thread; four outer through holes 4-1-1 are evenly distributed along the circumferential direction on the lower side wall of the sliding sleeve outer cylinder 4-1;

[0062] See Figure 16 and Figure 17 , the sliding sleeve inner cylinder 4-2 is composed of a large-size barrel and a small-size barrel connected in sequence from top to bottom, and annular steps are formed on both the outer wall and the inner wall at the connection of the two; among them,

[0063] The outer diameter of the large-size barrel is adapted to the inner diameter of the sliding sleeve outer cylinder 4-1, and four inner through holes 4-2-1 are evenly distributed along the circumferential direction on the side wall of the barrel. The four inner through holes 4-2-1 have the same shape and size as the four outer through holes 4-1-1; the inner wall of the top end of the large-size barrel is provided with a connecting internal thread, so that when the sliding sleeve outer cylinder 4-1 is threadedly connected to the bottom end of the reversing outer cylinder 3-1, the large-size barrel is simultaneously threadedly connected and fixed to the bottom outer wall of the central tube;

[0064] The sliding sleeve inner cylinder 4-2 is sleeved inside the sliding sleeve outer cylinder 4-1. And in the initial state, the four inner through holes 4-2-1 on the sliding sleeve inner cylinder 4-2 are respectively located directly above the four outer through holes 4-1-1 of the sliding sleeve outer cylinder 4-1; the sealing ring 4-3 is specifically a rubber sealing ring, which is sleeved on the outside of the small-size barrel and abuts against the annular step formed between the large-size barrel and the small-size barrel; the support bracket 4-4 is sleeved on the outside of the small-size barrel and fixed to the outer wall of the small-size barrel by a plurality of circumferentially arranged pins, so that the support bracket 4-4 supports on the bottom surface of the sealing ring 4-3; the sealing ring 4-3 is arranged at the position between the four outer through holes 4-1-1 and the four inner through holes 4-2-1 to block the communication channel between the inner and outer through holes;

[0065] The connecting sleeve 4-5 is a cylindrical barrel with an inner diameter larger at the upper side than at the lower side. The outer wall of its top is provided with a connecting external thread, so that its top end is threadedly connected to the inner wall of the bottom end of the sliding sleeve outer cylinder 4-1; the inner diameter of the lower side of the connecting sleeve 4-5 is adapted to the outer diameter of the small-size barrel, so that it is sleeved on the outside of the small-size barrel and forms a seal with the small-size barrel through a double-sealing ring arranged on the inner wall of the lower side of the connecting sleeve 4-5;

[0066] The piston barrel 4-6 is sleeved outside the connecting sleeve 4-5, and its top end is fixed on the outer wall of the connecting sleeve 4-5 by a plurality of pins evenly distributed in the circumferential direction; an annular boss is provided on the inner wall of the bottom end of the piston barrel 4-6;

[0067] See Figure 18 , the lower joint 4-10 is of a cylindrical barrel structure, and it is sleeved inside the piston barrel 4-6 in a manner that there is an annular space gap between them. A third annular space is formed between them through the annular boss on the inner wall of the bottom end of the piston barrel 4-6; the lower joint 4-10 is connected and fixed to the piston barrel 4-6 as a whole by a plurality of pins arranged in the circumferential direction on the annular boss of the piston barrel 4-6; a plurality of T-shaped pin holes for arranging the positioning pin 4-8 are opened on the outer wall of the top end of the lower joint 4-10 in the circumferential direction, and the outer diameter of the T-shaped pin hole is larger than its inner diameter; a connecting external thread is provided on the outer wall of the bottom end of the lower joint 4-10, specifically a 3-1 / 2” flush tubing male thread;

[0068] The unlocking piston 4-7 is sleeved in the third annular space (i.e., the piston cavity of the unlocking piston 4-7) in a manner that there is a gap between the top end of the unlocking piston 4-7 and the bottom end of the connecting sleeve 4-5; See Figure 20 , the unlocking piston 4-7 is specifically a cylindrical barrel with an annular boss on its inner wall, and it is connected and fixed to the piston barrel 4-6 as a whole by a plurality of pins arranged in the circumferential direction on the side wall of the piston barrel 4-6; an outer annular groove is opened on the outer wall of the unlocking piston 4-7, an inner annular groove is opened on the inner wall of the piston barrel 4-6, and a retaining snap ring 4-11 is embedded in the inner annular groove; the opening position of the inner annular groove on the inner wall of the piston barrel 4-6 is such that when the unlocking piston 4-7 descends to the bottom of the third annular space, it aligns with the outer annular groove on the outer wall of the unlocking piston 4-7, so that the retaining snap ring 4-11 is simultaneously embedded in the outer annular groove and the inner annular groove; in order to ensure the sealing performance, seals are respectively formed between the unlocking piston 4-7 and the lower joint 4-10 through double seals provided on the upper side of the inner wall of the annular boss of the unlocking piston 4-7; seals are formed between the unlocking piston 4-7 and the piston barrel 4-6 through double seals provided on the outer wall of the unlocking piston 4-7.

[0069] See Figure 19 and Figure 21, the positioning pin 4-8 is a pin body with an annular boss on the outer wall of one end, and a spring 4-9 is sleeved outside the pin body; a plurality of positioning pins 4-8 are arranged in a circumferential direction with the annular boss end facing outward and are respectively inserted into a plurality of T-shaped through holes opened on the lower joint 4-10 in a one-to-one correspondence; the outer diameter of the annular boss end of the positioning pin 4-8 is greater than the outer inner diameter of the T-shaped pin hole, so that both ends of the annular boss end of the positioning pin 4-8 respectively abut against the outer wall of the lower joint 4-10 and the inner wall of the top end of the unlocking piston 4-7 and are limited by the upper end face of the annular boss of the unlocking piston 4-7, and the inner end of the positioning pin 4-8 extends into the inner side of the lower joint 4-10 and abuts against the bottom surface of the inner cylinder 4-2 of the sliding sleeve; the spring 4-9 is in a compressed state, one end of which abuts against the annular boss of the positioning pin 4-8 and the other end abuts against the annular step on the inner wall of the T-shaped pin hole; the T-shaped through hole is communicated with the gap above the unlocking piston 4-7.

[0070] The installation method of the sliding sleeve mechanism 4 is as follows: First, insert the inner cylinder 4-2 of the sliding sleeve into the outer cylinder 4-1 of the sliding sleeve so that the inner cylinder 4-2 of the sliding sleeve is close to the upper threaded part of the outer cylinder 4-1 of the sliding sleeve. When inserting, the inner threaded end of the inner cylinder 4-2 of the sliding sleeve faces upward. Insert a sealing ring 4-3 and a support bracket 4-4 into the annular space between the outer cylinder 4-1 of the sliding sleeve and the inner cylinder 4-2 of the sliding sleeve, use the support bracket 4-4 to squeeze the sealing ring 4-3 upward, and use a pin to fix the support bracket 4-4 on the outer wall of the inner cylinder 4-2 of the sliding sleeve. At this time, the outer through hole 4-1-1 on the outer cylinder 4-1 of the sliding sleeve and the inner channel 4-2-1 on the inner cylinder 4-2 of the sliding sleeve are sealed off by the sealing ring 4-3. Then, sleeved the connecting sleeve 4-5 upward on the lower part of the inner cylinder 4-2 of the sliding sleeve and connect it to the lower part of the inner cylinder 4-2 of the sliding sleeve by thread. Place the spring 4-9 into the installation hole of the lower joint 4-10, insert the positioning pin 4-8, and sleeved the unlocking piston 4-7 installed with the anti-rotation snap ring 4-11 upward from the lower threaded end of the lower joint 4-10, so that the large-diameter end of the upper part of the unlocking piston 4-7 presses against the tail of the positioning pin 4-8, thereby installing the positioning pin 4-8 in the installation hole. At this time, the positioning pin 4-8 supports the inner cylinder 4-2 of the sliding sleeve to prevent it from sliding down. Finally, sleeved the piston cylinder 4-6 upward from the lower threaded end of the lower joint 4-10, pass through the unlocking piston 4-7 all the way up, and fix the piston cylinder 4-6 on the connecting sleeve 4-5 with a pin, fix the unlocking piston 4-7 on the piston cylinder 4-6 with a pin, and fix the piston cylinder 4-6 and the lower joint 4-10 by pin connection to complete the installation of the sliding sleeve mechanism 4; after the installation of the sliding sleeve mechanism 4 is completed, the whole is lifted upward, the outer cylinder 4-1 of the sliding sleeve is connected to the outer cylinder 3-1 for reversing by thread, and the inner cylinder 4-2 of the sliding sleeve is connected to the central tube 2-2 by thread. Since the positioning pin 4-8 supports the inner cylinder 4-2 of the sliding sleeve, it supports the inner cylinder 4-2 of the sliding sleeve and the central tube 2-2 to prevent them from sliding down.

[0071] See Figure 1, the tail plug 5 is a blind plug, and its inner wall is provided with a connecting internal thread, specifically the 3-1 / 2" flush tubing female thread, so that the tail plug 5 is sleeved and threadedly connected to the outer wall of the bottom end of the lower joint 4-10 to seal the opening at the bottom end of the lower joint 4-10.

[0072] See Figure 1 , Figure 5 , Figure 6 and Figure 7 , the working principle of the packer tool with a built-in sliding sleeve is as follows:

[0073] I. Setting process: The tool is conveyed to the predetermined position through a coiled tubing or tubing string. During the downward conveyance of the tool, since the positioning pin 4-8 supports the inner cylinder 4-2 of the sliding sleeve and the central tube 2-2, the entire packer tool can be prevented from setting prematurely during the conveyance; after reaching the predetermined position, by pressurizing the inside of the conveyance string, when the high-pressure fluid enters the central tube 2-2, restricted by the tail plug 5, the high-pressure fluid is conveyed to the upper space of the piston body of the setting piston 2-9 through the slotted hole 2-2-2 and the pressure transmission hole 2-9-1, thereby squeezing the setting piston 2-9 downward, forcing the setting piston 2-9 to move downward, and driving the drag cap 2-3 connected to its upper end to move downward. The downward-moving drag cap 2-3 squeezes the rubber cylinder 2-4 between the bottom rubber cylinder support 2-6, the rubber cylinder gasket 2-7 and the special-shaped support 2-8, causing the rubber cylinder 2-4 to expand and deform outward, tightly adhering to the inner wall of the wellbore, and realizing the isolation between the upper and lower layers. During the downward movement of the setting piston 2-9, the liquid below it is discharged through the communication hole 2-2-1 and the outer discharge check valve 2-1-1.

[0074] II. Sliding sleeve opening process: During the pressurization of the central tube 2-2, the high-pressure fluid flows downward, enters the upper part of the unlocking piston 4-7 through the gap of the positioning pin 4-8, and presses the unlocking piston 4-7 downward; under the action of the pressure, the pin of the unlocking piston 4-7 is sheared off, and the unlocking piston 4-7 moves downward to the bottom of the piston cylinder 4-6 and is fixed in the piston cylinder 4-6 by the anti-reverse retaining ring 4-11, thereby releasing the positioning pin 4-8 inward under the action of the spring 4-9, so that the positioning pin 4-8 no longer supports the inner cylinder 4-2 of the sliding sleeve; after the rubber cylinder 2-4 expands, to prevent the rubber cylinder from recovering and deforming, the coiled tubing or tubing string is lowered, and the inner cylinder 4-2 of the sliding sleeve without the support of the positioning pin 4-8 drives the central tube 2-2 to move downward together; on the one hand, the compression cap 2-1 presses on the upper end of the drag cap 2-3, thereby preventing the rubber cylinder from rebounding and deforming; on the other hand, while the central tube 2-2 moves downward, the restraint block 2-2-3 on it slides along the axial track 3-2-1 to the lowest point, and the inner channel 4-2-1 on the inner cylinder 4-2 of the sliding sleeve coincides and communicates with the outer through hole 4-1-1 of the outer sleeve 4-1 of the sliding sleeve, which is equivalent to opening the channel between the oil and gas layer and the conveyance string, and at this time, operations such as testing for production or injecting ash for plugging can be carried out.

[0075] III. Unsealing process: After the operation is completed, lift the coiled tubing or tubing string such as the tubing string, driving the central tube 2-2 and the inner cylinder 4-2 of the sliding sleeve to move upward. At this time, the inner channel 4-2-1 is separated from the outer through hole 4-1-1 of the outer cylinder 4-1 of the sliding sleeve again and is sealed off by the sealing ring 4-3. At this time, the channel between the oil and gas layer and the tubing string returns to the closed state. During the process of lifting the central tube 2-2, the restraint block 2-2-3 on it slides along the lower inclined track 3-2-2. Under the restraint of the lower inclined track 3-2-2, the central tube 2-2 rotates 90° around its central axis, so that the upper radial communication hole of the communication hole 2-2-1 rotates synchronously to communicate with the internal pressure check valve passage. Under the action of the pressure fluid in the wellbore, the fluid enters the communication hole 2-2-1 through the internal pressure check valve 2-1-2 and is transmitted to the second annulus space below the setting piston 2-9, thereby pushing the setting piston 2-9 upward, and the rubber cylinder 2-4 is no longer squeezed and gradually recovers its deformation. After lifting to the highest point of the lower inclined track 3-2-2, wait for 10 minutes. After the rubber cylinder 2-4 completely recovers its deformation, continue to lift the tubing string, and the restraint block 2-2-3 enters the upper inclined track 3-2-3. Under the restraint of the upper inclined track 3-2-3, the central tube 2-2 rotates 90° around its central axis, so that the upper radial communication hole of the communication hole 2-2-1 rotates again to communicate with the outer discharge check valve passage, restoring the initial state of communicating with the outer discharge check valve 2-1-1, and the unsealing is completed, restoring the initial state of the tool.

[0076] See Figure 24 , taking the first layer as an example for testing and production measurement, lower the tool between the first layer and the second layer, and pressurize the tubing string through the ground to realize the setting of the packer tool, separating and isolating the first layer and the second layer. Lower the tubing string through the ground to open the self-contained sliding sleeve, that is, the outer through hole 4-1-1 of the outer cylinder 4-1 of the sliding sleeve coincides with the inner channel 4-2-1 of the inner cylinder 4-2 of the sliding sleeve, forming a communication channel between the oil and gas layer and the tubing string. The oil and gas in the oil and gas layer enter the tool through the overlapping sliding sleeve channel of the tool, and then enter the tubing string and are transported to the ground. The production of the formation can be known by directly measuring the output through the ground.

[0077] If taking the first layer as an example for grouting and plugging, lower the tool between the first layer and the second layer in the same way. After setting, isolate the two layers. Lower the tubing string to open the sliding sleeve and form a channel. By injecting cement slurry into the tubing string, after the cement slurry enters the tool, it enters the oil and gas layer through the channel composed of the inner and outer sliding sleeves, plugging the oil and gas layer.

Claims

1. A packer tool with a built-in sliding sleeve, characterized in that, It is composed of a setting mechanism (2), a reversing mechanism (3), a sliding sleeve mechanism (4) and a tail plug (5) connected in sequence from top to bottom; among them, The setting mechanism (2) includes a compression cap (2-1), a dragging cap (2-3), a setting rubber cylinder, a rubber cylinder gasket (2-7), a special-shaped support (2-8), a setting piston (2-9) and a connecting cylinder (2-10) sleeved on the outside of the central tube (2-2) in sequence from top to bottom; a communication hole (2-2-1) is opened in the side wall of one side of the central tube (2-2), which is composed of an upper radial communication hole, an axial communication hole and a lower radial communication hole connected in sequence, and the upper radial communication hole and the lower radial communication hole are communicated with the outside of the central tube; a slotted hole (2-2-2) and a constraint block (2-2-3) are respectively arranged on the upper and lower parts of the side wall of the other side of the central tube (2-2), the slotted hole (2-2-2) is a strip-shaped hole opened along the axial direction of the central tube (2-2) and there are multiple ones, and they are arranged at intervals along the circumferential direction; the constraint block (2-2-3) is vertically fixed on the outer wall of the central tube (2-2); the compression cap (2-1) is sleeved and fixed on the top side of the central tube (2-2), and an outer discharge check valve (2-1-1) and an inner pressure check valve (2-1-2) are respectively arranged along the radial direction at the same height on its side wall, the included angle formed by the axial directions of the two is 90°, and the outer discharge check valve (2-1-1) is initially communicated with the upper radial communication hole of the communication hole (2-2-1); the dragging cap (2-3) is sleeved on the outside of the central tube (2-2) and is arranged at intervals below the compression cap (2-1); the setting piston (2-9) is sleeved on the outside of the central tube (2-2), its top end is fixed at the bottom end of the dragging cap (2-3), the outer diameter of its bottom end gradually increases from top to bottom and forms an upper annular step and a lower annular step in sequence, and a plurality of pressure transmission holes (2-9-1) are uniformly arranged along the circumferential direction on the side wall between the upper annular step and the lower annular step, and an annular groove communicated with a plurality of pressure transmission holes (2-9-1) and a plurality of slotted holes (2-2-2) is opened on its inner wall; the setting rubber cylinder, the rubber cylinder gasket (2-7) and the special-shaped support (2-8) are sleeved on the outside of the setting piston (2-9) in sequence from top to bottom, and the special-shaped support (2-8) is press-fitted on the upper annular step of the setting piston (2-9); the connecting cylinder (2-10) is sleeved on the outside of the central tube (2-2) with an annular space gap, and its top end is fixed at the bottom end of the special-shaped support (2-8); the setting piston (2-9) can move in the annular space gap, and the annular space gap is separated by the lower annular step at the bottom end of the setting piston (2-9) into a first annular space and a second annular space located on the upper and lower sides respectively, a plurality of pressure transmission holes (2-9-1) are communicated with the first annular space, and the lower radial communication hole is communicated with the annular space gap and the second annular space; The commutation mechanism (3) includes a commutation outer cylinder (3-1) sleeved outside the central tube (2-2) and fixed to the bottom end of the connection cylinder (2-10); a constraint track (3-2) is provided on the inner wall of the commutation outer cylinder (3-1), which is a triangular track formed by sequentially connecting the axial track (3-2-1), the lower inclined track (3-2-2) and the upper inclined track (3-2-3) end to end, and the arc span of the triangular track in the circumferential direction is 90°; the constraint block (2-2-3) is initially embedded in the top side of the axial track (3-2-1); the opening positions of the lower inclined track (3-2-2) and the upper inclined track (3-2-3) satisfy that when the constraint block (2-2-3) slides to the bottom side of the axial track (3-2-1) and slides upward along the lower inclined track (3-2-2) to the intersection with the upper inclined track (3-2-3), the central tube (2-2) rotates accordingly so that the upper radial passage of the communication passage (2-2-1) is communicated with the internal pressure check valve (2-1-2), and when the constraint block (2-2-3) slides along the upper inclined track (3-2-3) and returns to the top side of the axial track (3-2-1), the central tube (2-2) rotates back so that the upper radial passage of the communication passage (2-2-1) is communicated with the external discharge check valve (2-1-1); The sliding sleeve mechanism (4) includes a sliding sleeve outer cylinder (4-1), a sliding sleeve inner cylinder (4-2), a sealing ring (4-3), a support bracket (4-4), a connecting sleeve (4-5), a piston cylinder (4-6), an unlocking piston (4-7) and a plurality of positioning pins (4-8); the sliding sleeve inner cylinder (4-2) is composed of a large-diameter cylinder body and a small-diameter cylinder body connected in sequence from top to bottom, and annular steps are formed on the outer wall and inner wall at the connection of the two; the sliding sleeve outer cylinder (4-1) is sleeved outside the large-diameter cylinder body, and their tops are respectively fixed at the bottom ends of the reversing outer cylinder (3-1) and the central pipe (2-2); four inner through holes (4-2-1) are evenly distributed along the circumferential direction on the side wall of the large-diameter cylinder body, and four outer through holes (4-1-1) with the same shape and size as the inner through holes (4-2-1) are evenly distributed along the circumferential direction on the lower side wall of the sliding sleeve outer cylinder (4-1), and the four outer through holes (4-1-1) are respectively located directly below the four inner through holes (4-2-1); the sealing ring (4-3) and the support bracket (4-4) are sleeved in sequence from top to bottom in the annular space formed between the sliding sleeve outer cylinder (4-1) and the small-diameter cylinder body, and the sealing ring (4-3) is located between the outer through hole (4-1-1) and the inner through hole (4-2-1); the piston cylinder (4-6) is sleeved outside the connecting sleeve (4-5), and its top is fixed on the outer wall of the connecting sleeve (4-5) by a plurality of pins evenly distributed along the circumferential direction; the lower joint (4-10) is sleeved inside the piston cylinder (4-6) in a manner that there is an annular space, and a third annular space is formed between the two through the annular boss on the inner wall at the bottom end of the piston cylinder (4-6), and the lower joint (4-10) is fixed on the piston cylinder (4-6) by a plurality of pins evenly distributed along the circumferential direction on the annular boss; the unlocking piston (4-7) is sleeved in the third annular space in a manner that there is a gap between its top and the bottom end of the connecting sleeve (4-5), and it is fixed on the piston cylinder (4-6) by a plurality of pins evenly distributed along the circumferential direction; a plurality of positioning pins (4-8) are respectively passed through a plurality of T-shaped pin holes opened on the top side wall of the lower joint (4-10) through the compression spring (4-9) sleeved on them, the outer ends of each positioning pin (4-8) abut against the inner wall of the unlocking piston (4-7), the inner ends abut against the bottom surface of the sliding sleeve inner cylinder (4-2), and the T-shaped pin holes communicate with the unlocking piston (4-7); the tail plug (5) is fixed at the bottom end of the lower joint (4-10) and seals the bottom opening thereof.

2. The packer tool with a built-in sliding sleeve according to claim 1, characterized in that, It also includes an upper joint (1) having a cylindrical cylinder structure. The inner wall at the top end of the upper joint (1) is provided with a connecting internal thread that mates with the external thread for connecting the bottom end of the oil pipe. The outer wall at its bottom end is provided with a connecting external thread that mates with the connecting internal thread on the inner wall at the top end of the compression cap (2-1). The inner wall at its bottom end is provided with a connecting internal thread that mates with the connecting external thread on the top side outer wall of the central shaft (2-2).

3. The packer tool with a built-in sliding sleeve according to claim 1, characterized in that, The external discharge check valve (2-1-1) includes an external discharge check passage radially opened on the side wall of the compression cap (2-1), and the inner diameter of the outer passage of the external discharge check valve is larger than that of the inner passage, so that an annular setting and sealing step is formed on the inner wall of the passage; a check ball (2-1-1-2) is arranged in the inner passage of the external discharge check passage, and an over-flow plug sleeve (2-1-1-1) is sleeved and fixed on the inner wall of the outer passage of the external discharge check valve, so that the check ball (2-1-1-2) is limited to roll back and forth between the over-flow plug sleeve (2-1-1-1) and the annular setting and sealing step; the internal pressure check valve (2-1-2) includes an internal pressure check passage radially opened on the side wall of the compression cap (2-1), and the inner diameter of the outer passage of the internal pressure check valve is larger than that of the inner passage, so that an annular step is formed on the inner wall of the passage; an internal pressure spring (2-1-2-1) and a check ball (2-1-1-2) are sequentially arranged from inside to outside in the inner passage of the internal pressure check passage, and an over-flow plug sleeve (2-1-1-1) is sleeved and fixed on the inner wall of the outer passage of the internal pressure check valve, so that the check ball (2-1-1-2) is limited to roll back and forth between the over-flow plug sleeve (2-1-1-1) and the internal pressure spring (2-1-2-1), and two ends of the internal pressure spring (2-1-2-1) respectively abut against the annular step and the check ball (2-1-1-2).

4. The packer tool with a built-in sliding sleeve according to claim 1, characterized in that, The setting and sealing rubber cylinder includes a plurality of rubber cylinders (2-4), and an intermediate gasket (2-5) is arranged between every two adjacent setting and sealing rubber cylinders, and a rubber cylinder support (2-6) is arranged below the rubber cylinder (2-4) at the bottom end.

5. The packer tool with a built-in sliding sleeve according to claim 4, characterized in that, The top surface of the rubber cylinder (2-4) at the top side is processed with an upper arc surface, and the bottom surface of the dragging cap (2-3) is processed into an inner concave arc surface capable of fitting and cooperating with the upper arc surface of the rubber cylinder (2-4); the bottom surface of the rubber cylinder (2-4) at the bottom side is processed with a lower arc surface, and the rubber cylinder support (2-6) is processed into a conical cylinder body cooperating with the lower arc surface of the rubber cylinder (2-4); an arc-shaped groove cooperating with the bottom end of the rubber cylinder support (2-6) is centrally opened on the top surface of the rubber cylinder gasket (2-7), and a conical deep groove is centrally opened on the bottom surface of the rubber cylinder gasket (2-7); the top end of the special-shaped support (2-8) is a conical end, and the conical end cooperates with the conical deep groove opened on the bottom surface of the rubber cylinder gasket (2-7), so that the special-shaped support (2-8) and the rubber cylinder gasket (2-7) are inserted and connected.

6. The packer tool with a built-in sliding sleeve according to claim 1, wherein The depth and width of the constraint track (3-2) are both larger than the length and diameter of the constraint block (2-2-3) on the central pipe (2-2).

7. The packer tool with a built-in slip sleeve according to claim 1, wherein An outer annular groove is opened on the outer wall of the unlocking piston (4-7), an inner annular groove is opened on the inner wall of the piston cylinder (4-6), and a retaining snap ring (4-11) is embedded in the inner annular groove; the opening position of the inner annular groove on the inner wall of the piston cylinder (4-6) satisfies that when the unlocking piston (4-7) descends to the bottom of the third annular space, the inner annular groove is aligned with the outer annular groove on the outer wall of the unlocking piston (4-7), so that the retaining snap ring (4-11) is simultaneously embedded in the outer annular groove and the inner annular groove.

8. The packer tool with a built-in sliding sleeve according to claim 1, characterized in that, The outer inner diameter of the T-shaped pin hole formed on the top side wall of the lower joint (4-10) is larger than the inner inner diameter, so that an annular step is formed on the inner wall of the T-shaped pin hole; the positioning pin (4-8) is a pin body with an annular boss provided on the outer wall of one end, and the outer diameter of the annular boss end is larger than the outer inner diameter of the T-shaped pin hole, so that the other end of the annular boss end abuts against the outer wall of the lower joint (4-10), and the outer diameter of the spring (4-9) sleeved on the positioning pin (4-8) is adapted to the outer inner diameter of the T-shaped pin hole, so that both ends of the spring (4-9) respectively abut against the annular boss on the positioning pin (4-8) and the annular step on the inner wall of the T-shaped pin hole.

9. The packer tool with a built-in sliding sleeve according to claim 1, characterized in that A seal is formed between the compression cap (2-1) and the central tube (2-2) through a double seal ring provided on the inner wall of the top end of the compression cap (2-1); a seal is formed between the special-shaped support (2-8) and the setting piston (2-9) through a double seal ring provided on the inner wall of the special-shaped support (2-8); a seal is formed between the setting piston (2-9) and the connecting cylinder (2-10) through a double seal ring provided on the outer wall of the lower annular step of the setting piston (2-9); a seal is formed between the setting piston (2-9) and the central tube (2-2) through a double seal ring provided on the inner wall of the bottom end of the setting piston (2-9); a seal is formed between the bottom end of the connecting cylinder (2-10) and the central tube (2-2) through a double seal ring provided on the inner wall of the bottom end of the connecting cylinder (2-10).

10. The packer tool with a built-in sliding sleeve according to claim 1, characterized in that, A seal is formed between the lower side of the connecting sleeve (4-5) and the small-diameter cylinder through a double seal ring provided on the inner wall of the lower side of the connecting sleeve (4-5); a seal is formed between the lower side of the connecting sleeve (4-5) and the piston cylinder (4-6) through a double seal ring provided on the outer wall of the lower side of the connecting sleeve (4-5); seals are respectively formed between the unlocking piston (4-7) and the lower joint (4-10) through double seal rings provided on the upper side of the inner wall of the annular boss of the unlocking piston (4-7); a seal is formed between the unlocking piston (4-7) and the piston cylinder (4-6) through a double seal ring provided on the outer wall of the unlocking piston (4-7).

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