Direct connection sleeve whipstock

Abstract

The utility model relates to the technical field of whipstock, in particular to a direct connection sleeve whipstock. Comprising a pipe body, a window is formed in one side of the pipe body, a fixed inclined plate is detachably and fixedly connected in the lower end of the window, a movable inclined plate is slidably arranged in the pipe body above the fixed inclined plate, the fixed inclined plate is parallel to the movable inclined plate, a sliding rod is detachably and fixedly connected to the lower end of the movable inclined plate, and the sliding rod slidably penetrates through the fixed inclined plate; the axial direction of the sliding rod is parallel to the axial direction of the pipe body, a pressing block is fixed to the lower end of the sliding rod, a plurality of lower grooves are evenly formed in the position, below the pressing block, of the upper circumference of the pipe body, rotating blocks are eccentrically, elastically and rotationally connected into the lower grooves, and the upper ends of the rotating blocks make contact with the lower end of the pressing block. According to the whipstock, the movable inclined plate and the fixed inclined plate with different inclination angles can be replaced conveniently, and the angle of windowing sidetrack drilling can be adjusted conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of whipstocks, in particular to a direct-connected casing whipstock. Background Art

[0002] After a long time of use in drilling, due to serious damage to the downhole casing and inability to repair it, or complex accidents occurring downhole and inability to handle them, it is necessary to sidetrack a wellbore at a suitable depth above the damaged well section. When sidetracking, it is necessary to lower and fix a whipstock at the target position in advance. The positioning whipstock technology has gone through the development process of cement consolidated inclined plane, milled cutter, mechanically set whipstock, hydraulic slip positioning whipstock, etc. Currently, the more commonly used one is the hydraulic slip positioning whipstock. However, positioning whipstock tools such as hydraulic slips do not have a sealing design. Due to reasons such as casing corrosion and water well scaling, the slips of the positioning whipstock are not firmly anchored and the whipstock is displaced, resulting in the failure of sidetracking window opening.

[0003] The patent document with the publication number CN201162506Y discloses a branch well window opening tool with an expansion pipe. Before entering the well, the entering well orientation of the whipstock is adjusted according to the predetermined opening direction of the branch well window. After the device is lowered in place, ground pressure is applied according to the pump displacement required for the expansion of the setting pipe. The liquid enters the setting pipe through the sealed connection of the pre-sealed milling cone, transmission pipe, setting pipe and sealing plate. When the pressure difference inside and outside the setting pipe reaches a certain value, the setting pipe expands to the inner wall of the outer casing and is in close contact with it. After confirming that the setting is completed, the ground reduces the displacement and the setting pipe does not rebound, and the lower whipstock tool is set. After setting, the drill string is slightly lifted. Under the action of the pulling force, the transmission pipe is broken, and the drill string above the milling cone and the lower whipstock tool are released. After confirming the release, drilling pressure is applied. Under the action of the whipstock, the branch well is opened and sidetracked until the designed well depth. After completion of the well, the lower whipstock tool is recovered to the ground by using a supporting recovery tool. However, during the window opening and sidetracking, the whipstock will be subjected to a large pressure. When the casing at the setting pipe is corroded or the water well is scaled, the whipstock cannot be effectively stabilized, and the problem of whipstock displacement is likely to occur during the window opening and sidetracking.

[0004] The patent document with the publication number CN206972163U discloses a whipstock directly connected to the casing. This tool does not need to set a setting tool and can be directly connected to the lower part of the casing, synchronously with the cementing of the lower casing, saving the time of separate whipstock running and pulling out, and improving its whipstock efficiency. However, during the window opening and sidetracking, the drill string will apply a large pressure to the whipstock plate and will also apply a large pulling force to the casing string. When the connection position of the casing string slips, the casing string is likely to break during the window opening and sidetracking process. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is a direct-connected casing whipstock that can avoid damage to the casing string due to excessive tensile force during the process of side drilling on the window opening side.

[0006] In order to achieve the above object, the technical solution provided by the utility model is:

[0007] A direct-connected casing whipstock, comprising a pipe body. One side of the pipe body is provided with a window opening. A fixed inclined plate is detachably and fixedly connected inside the lower end of the window opening. An active inclined plate is slidably arranged inside the pipe body above the fixed inclined plate. The fixed inclined plate is parallel to the active inclined plate. The lower end of the active inclined plate is detachably and fixedly connected with a sliding rod. The sliding rod slidably penetrates through the fixed inclined plate. The axial direction of the sliding rod is parallel to the axial direction of the pipe body. A pressing block is fixed at the lower end of the sliding rod. A plurality of lower grooves are evenly distributed in a circumferential manner on the pipe body below the pressing block. A rotating block is eccentrically and elastically rotatably connected inside each lower groove. The upper end of the rotating block contacts the lower end of the pressing block. After the pressing block moves downward, it can drive the rotating block to rotate. After the rotating block rotates, its lower end can tightly abut against the well wall.

[0008] Specifically, a collar for threadedly connecting with the lower end of the casing string is fixedly connected to the upper end of the pipe body.

[0009] Specifically, a rotating shaft is fixedly arranged on each rotating block. The rotating shaft is rotatably connected with the pipe body. A torsion spring is sleeved on the rotating shaft. One end of the torsion spring is fixedly connected with the pipe body, and the other end of the torsion spring is fixedly connected with the rotating block.

[0010] Specifically, the pressing block is slidably and sealingly connected with the pipe body.

[0011] Specifically, the active inclined plate includes a first insertion part that slides through the window opening and is slidably arranged inside the pipe body, and a first blocking part that is slidably arranged inside the window opening. The end face of the first blocking part away from the first insertion part is flush with the outer peripheral surface of the pipe body. The fixed inclined plate includes a second insertion part that penetrates through the window opening and is fixedly arranged inside the pipe body, and a second blocking part that is fixedly arranged inside the window opening. The end face of the second blocking part away from the second insertion part is flush with the outer peripheral surface of the pipe body.

[0012] Specifically, the fixed inclined plate is fixedly connected with the pipe body by bolts, and the upper end of the sliding rod is threadedly connected with the active inclined plate.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. This whipstock facilitates the replacement of the active inclined plate and the fixed inclined plate with different inclination angles, and is convenient for adjusting the angle of side drilling on the window opening side.

[0015] 2. During the process of window cutting and sidetracking, the drill string tightly abuts against the movable inclined plate, causing the movable inclined plate to tightly abut against the fixed inclined plate. After the fixed inclined plate and the movable inclined plate come into contact, they can guide the drill string. At the same time, after the fixed inclined plate and the movable inclined plate come into contact, the sliding rod causes the rotating block to rotate through the pressing block. After the rotating block rotates, the lower end of the rotating block can tightly abut against the wellbore wall, reducing the tension on the casing string during the process of window cutting and sidetracking and preventing damage to the casing string. Brief Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the present utility model.

[0017] Figure 2 It is a front view of the present utility model.

[0018] Figure 3 It is a top view of the present utility model.

[0019] Figure 4 is Figure 3 the cross-sectional view taken along the line A-A in

[0020] Figure 5 It is a schematic diagram of the movable inclined plate.

[0021] Figure 6 It is a schematic diagram of the fixed inclined plate.

[0022] The names of the components in the drawings are: 1. Pipe body, 2. Coupling, 3. Window cutting, 4. Movable inclined plate, 5. Fixed inclined plate, 6. Lower groove, 7. Rotating block, 8. Rotating shaft, 9. Pressing block, 10. Sliding rod, 41. First insertion part, 42. First blocking part, 51. Second insertion part, 52. Second blocking part. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0024] Embodiment 1: Referring to Figures 1-4 as shown, a direct-connected casing whipstock includes a pipe body 1, and a coupling 2 for threadedly connecting with the lower end of the casing string is fixedly connected to the upper end of the pipe body 1.

[0025] A window 3 is provided on one side of the pipe body 1, and a fixed inclined plate 5 is detachably and fixedly connected inside the lower end of the window 3. Specifically, the fixed inclined plate 5 is fixedly connected to the pipe body 1 by bolts.

[0026] A movable inclined plate 4 is slidably arranged in the pipe body 1 above the fixed inclined plate 5. The fixed inclined plate 5 is parallel to the movable inclined plate 4. A slide bar 10 is detachably and fixedly connected to the lower end of the movable inclined plate 4. Specifically, the upper end of the slide bar 10 is threadedly connected to the movable inclined plate 4. The slide bar 10 slidably penetrates through the fixed inclined plate 5, and the axial direction of the slide bar 10 is parallel to the axial direction of the pipe body 1.

[0027] A pressing block 9 is fixed to the lower end of the slide bar 10, and the pressing block 9 is slidably and sealingly connected to the pipe body 1. A plurality of lower grooves 6 are evenly distributed in a circumferential manner on the pipe body 1 below the pressing block 9. A rotating block 7 is elastically and rotatably connected to each lower groove 6 in an eccentric manner. Specifically, a rotating shaft 8 is fixed to each rotating block 7, the rotating shaft 8 is rotatably connected to the pipe body 1, a torsion spring is sleeved on the rotating shaft 8, one end of the torsion spring is fixedly connected to the pipe body 1, and the other end of the torsion spring is fixedly connected to the rotating block 7. The upper end of the rotating block 7 contacts the lower end of the pressing block 9. After the pressing block 9 moves downward, it can drive the rotating block 7 to rotate. After the rotating block 7 rotates, its lower end can tightly abut against the wellbore wall.

[0028] During window opening and sidetracking, the pipe body 1 is connected to the lower end of the casing string through a coupling 2. After the pipe body 1 is lowered into the well to a set depth along with the casing string, the casing string and the pipe body 1 are rotated to adjust the position of the window opening 3. During the window opening and sidetracking process, the drilling tool tightly abuts against the movable inclined plate 4 and causes the movable inclined plate 4 to tightly abut against the fixed inclined plate 5. After the fixed inclined plate 5 and the movable inclined plate 4 contact, they can guide the drilling tool. At the same time, after the fixed inclined plate 5 and the movable inclined plate 4 contact, the slide bar 10 causes the rotating block 7 to rotate through the pressing block 9. After the rotating block 7 rotates, its lower end can tightly abut against the wellbore wall, and the tensile force received by the casing string can be reduced during the window opening and sidetracking process to prevent the casing string from being damaged.

[0029] Embodiment 2: On the basis of Embodiment 1, referring to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 6 shown, the movable inclined plate 4 includes a first insertion part 41 that is slidably arranged in the pipe body 1 after penetrating through the window opening 3 and a first blocking part 42 that is slidably arranged in the window opening 3. The end face of the first blocking part 42 away from the first insertion part 41 is flush with the outer edge surface of the pipe body 1.

[0030] The fixed inclined plate 5 includes a second insertion part 51 that is fixedly arranged in the pipe body 1 after penetrating through the window opening 3 and a second blocking part 52 that is fixedly arranged in the window opening 3. The end face of the second blocking part 52 away from the second insertion part 51 is flush with the outer edge surface of the pipe body 1.

[0031] Since the end face of the first blocking part 42 away from the first insertion part 41 is flush with the outer edge surface of the pipe body 1, and the end face of the second blocking part 52 away from the second insertion part 51 is flush with the outer edge surface of the pipe body 1, therefore, during the process of the casing string driving the pipe body 1 to descend, the situation that the pipe body 1 is blocked can be avoided.

[0032] A guide shoe can also be installed at the lower end of the pipe body 1 to facilitate the casing string to drive the pipe body 1 to descend in the well.

[0033] When the angle of the sidetracking needs to be changed, the movable inclined plate 4 and the fixed inclined plate 5 with different slopes can be replaced as needed. The movable inclined plate 4 and the fixed inclined plate 5 are convenient to install, so it is convenient to adjust the angle of the sidetracking.

[0034] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A direct-connected casing whipstock, comprising a pipe body (1), characterized in that, One side of the pipe body (1) is provided with an opening window (3). A fixed inclined plate (5) is detachably and fixedly connected inside the lower end of the opening window (3). An active inclined plate (4) is slidably arranged inside the pipe body (1) above the fixed inclined plate (5). The fixed inclined plate (5) is parallel to the active inclined plate (4). The lower end of the active inclined plate (4) is detachably and fixedly connected with a sliding rod (10). The sliding rod (10) slidably penetrates through the fixed inclined plate (5). The axial direction of the sliding rod (10) is parallel to the axial direction of the pipe body (1). A pressing block (9) is fixed at the lower end of the sliding rod (10). A plurality of lower grooves (6) are circumferentially and evenly arranged on the pipe body (1) below the pressing block (9). A rotating block (7) is eccentrically and elastically rotatably connected inside each lower groove (6). The upper end of the rotating block (7) contacts the lower end of the pressing block (9). After the pressing block (9) moves downward, it can drive the rotating block (7) to rotate. After the rotating block (7) rotates, its lower end can tightly abut against the well wall.

2. The direct-connected casing whipstock according to claim 1, wherein A coupling (2) for threadedly connecting with the lower end of the casing string is fixedly connected to the upper end of the pipe body (1).

3. The direct-connected casing whipstock according to claim 1, characterized in that, A rotating shaft (8) is fixedly arranged on each rotating block (7). The rotating shaft (8) is rotatably connected with the pipe body (1). A torsion spring is sleeved on the rotating shaft (8). One end of the torsion spring is fixedly connected with the pipe body (1), and the other end of the torsion spring is fixedly connected with the rotating block (7).

4. The direct-connected casing whipstock according to claim 1, characterized in that, The pressing block (9) is slidably and sealingly connected with the pipe body (1).

5. The direct-connect casing whipstock according to claim 1, wherein The active inclined plate (4) includes a first insertion part (41) that slides inside the pipe body (1) after passing through the opening window (3) and a first blocking part (42) that slides inside the opening window (3). The end face of the first blocking part (42) far away from the first insertion part (41) is flush with the outer edge surface of the pipe body (1). The fixed inclined plate (5) includes a second insertion part (51) that is fixedly arranged inside the pipe body (1) after passing through the opening window (3) and a second blocking part (52) that is fixedly arranged inside the opening window (3). The end face of the second blocking part (52) far away from the second insertion part (51) is flush with the outer edge surface of the pipe body (1).

6. The direct-connected casing whipstock according to claim 1, wherein The fixed inclined plate (5) is fixedly connected with the pipe body (1) by bolts. The upper end of the sliding rod (10) is threadedly connected with the active inclined plate (4).

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