A device for releasing a stuck jar

Abstract

The present application belongs to the field of oil drilling technology, and discloses a device for releasing a stuck drill pipe, which comprises an upper joint, a gland, bearing one, bearing two, a connecting shaft, a lower joint, an outer cylinder and a shear pin. The upper joint is installed below a shock device, and comprises a first shaft section, a second shaft section and a third shaft section. The gland is sleeved on the first shaft section and is in sealing connection with the first shaft section. Bearing one is sleeved on the first shaft section and axially abuts against the gland. Bearing two is sleeved on the second shaft section and axially abuts against bearing one. The connecting shaft is installed on the third shaft section and axially abuts against bearing two. The lower joint is sleeved on the connecting shaft, and the outer wall is provided with a sliding groove comprising a clamping position and a release position. The outer cylinder is sleeved on the connecting shaft, the upper end is connected with the gland, the inner wall is provided with a sliding key, and the sliding key is in sliding connection with the sliding groove. The shear pin is arranged through the connecting shaft, the lower joint and the outer cylinder. The device has a simple overall structure, is convenient to operate, can effectively transmit a shock force for releasing a stuck drill pipe, and greatly improves the success rate of releasing a stuck drill pipe.

Description

Technical Field

[0001] This invention relates to the field of oil drilling technology, and in particular to a device for releasing a shock absorber. Background Technology

[0002] As easily exploitable oil reservoirs continue to decrease, drilling is gradually shifting from easily developed wells to deep wells, horizontal wells, and highly deviated wells. Due to the long open hole sections of horizontal and highly deviated wells, they are easily affected by factors such as formation characteristics, mud properties, and directional drilling, which can lead to wellbore instability and cause downhole stuck accidents such as necking and collapse.

[0003] Currently, a powerful shovel tool that generates strong axial force is usually installed in the drill string to release stuck parts in a timely manner. However, due to the high frictional resistance in the curved sections of horizontal wells and the long open hole sections of highly deviated wells, the shovel force transmission effect is poor during shoveling, or even cannot be transmitted to the bottom of the well to release stuck parts. Once shoveling fails, it is necessary to use explosive loosening to remove the drill string above the stuck point, which damages the downhole environment and increases drilling risk and difficulty. Summary of the Invention

[0004] The purpose of this invention is to provide a card release device for a shocker, which can effectively transmit the card release shock force and improve card release efficiency.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A shock absorber release device, comprising:

[0007] The upper connector is installed below the drilling oscillator, and the upper connector includes a first shaft section, a second shaft section, and a third shaft section with different radial dimensions;

[0008] A gland is fitted onto the first shaft segment and press-fitted into a sealing connection with the first shaft segment.

[0009] Bearing 1 is fitted onto the first shaft segment and axially abuts against the pressure cap;

[0010] Bearing 2 is fitted onto the second shaft segment and axially abuts against bearing 1;

[0011] A connecting shaft is installed on the third shaft section and axially abuts against the bearing.

[0012] The lower connector is fitted onto the connecting shaft. The outer wall of the lower connector is provided with a sliding groove, which includes a snap-fit ​​position and a disengagement position.

[0013] An outer cylinder is fitted onto the connecting shaft, the upper end of the outer cylinder is connected to the pressure cap, and a sliding key is provided on the inner wall of the outer cylinder, the sliding key being slidably connected to the sliding groove;

[0014] A shear pin is inserted through the connecting shaft, the lower connector, and the outer cylinder;

[0015] When the drill is stuck, the upper connector and the outer cylinder are pulled upward by force, the shear pin breaks, the sliding key is placed in the snap-fit ​​position, the outer cylinder is snapped and fixed to the lower connector, and the upper connector can be rotated and vibrated to release the stuck state independently;

[0016] In the drill-free state, push down the upper connector, and the upper connector and the outer cylinder move down synchronously to disengage the sliding key from the locking position. Then, rotate and move the upper connector and the outer cylinder up synchronously, disengaging the sliding key from the disengagement position, and separating the outer cylinder from the lower connector.

[0017] As a preferred structure of the present invention, the groove is J-shaped.

[0018] As a preferred structure of the present invention, the bearing is a radial ball bearing.

[0019] As a preferred embodiment of the present invention, the bearing 2 is a thrust bearing.

[0020] As a preferred structure of the present invention, the connecting shaft, the lower connector and the outer cylinder are all provided with shear pin holes, and the shear pins are inserted into the shear pin holes.

[0021] As a preferred structure of the present invention, a sealing element is provided on the side of the gland facing the first shaft segment.

[0022] In a preferred embodiment of the present invention, the connecting shaft is threadedly connected to the third shaft segment.

[0023] In a preferred embodiment of the present invention, the outer cylinder is threadedly connected to the gland.

[0024] As a preferred structure of the present invention, the upper connector, the connecting shaft and the lower connector are axially hollow and connected.

[0025] As a preferred structure of the present invention, the outer cylinder is provided with an oil injection hole on its outer periphery.

[0026] The beneficial effects of this invention are:

[0027] The shock absorber release device of this invention effectively solves the problems of high frictional resistance in horizontal wells or extended reach wells, where the pressure or tension applied during stuck drilling cannot be effectively transmitted to the stuck point, resulting in a low success rate of release. It can detach the drill string above and below the device without explosive loosening, reducing the risk of the shock absorber becoming stuck in the well. The device has a simple overall structure, is easy to operate, and can effectively transmit the release shock force, significantly improving the release success rate. Attached Figure Description

[0028] Figure 1 This is a structural cross-sectional view of the shock absorber release device described in an embodiment of the present invention;

[0029] Figure 2 This is an unfolded schematic diagram of the slider and groove described in an embodiment of the present invention;

[0030] Figure 3 yes Figure 1 Cross-sectional view along the AA direction.

[0031] In the picture:

[0032] 1. Upper connector; 11. First shaft section; 12. Second shaft section; 13. Third shaft section; 2. Pressure cap; 21. Seal; 3. Bearing 1; 4. Bearing 2; 5. Connecting shaft; 6. Lower connector; 61. Slide groove; 611. Snap-fit ​​position; 612. Disengagement position; 7. Outer cylinder; 71. Slide key; 72. Oil injection hole; 8. Shear pin; 9. Shear pin hole. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] like Figures 1-3 As shown, this invention provides an unlocking device for a drilling rig, comprising an upper connector 1, a pressure cap 2, a first bearing 3, a second bearing 4, a connecting shaft 5, a lower connector 6, an outer cylinder 7, and a shear pin 8. The upper connector 1 comprises, from top to bottom, a first shaft segment 11, a second shaft segment 12, and a third shaft segment 13, with radial dimensions decreasing sequentially. The upper end of the upper connector is connected to the drilling rig. The pressure cap 2 is fitted onto the first shaft segment 11, and the pressure cap 2 is press-fitted onto the first shaft segment 11 and sealed to it. Optionally, a sealing element 21, which can be a rubber ring, is provided on the side of the pressure cap 2 facing the first shaft segment 11 to enhance the sealing between the pressure cap 2 and the first shaft segment 11. The first bearing 3 is fitted onto the first shaft segment 11 and axially abuts against the bottom end of the pressure cap 2; the first bearing 3 is preferably a radial ball bearing. The second bearing 4 is fitted onto the second shaft segment 12 and axially abuts against the bottom end of the first bearing 3; the second bearing 4 is preferably a thrust bearing. The connecting shaft 5 is installed on the third shaft section 13. The third shaft section 13 has external threads on its outer circumference. The connecting shaft 5 is threadedly connected to the third shaft section 13 and axially abuts against the bottom end of the bearing 4. The lower connector 6 is fitted onto the connecting shaft 5. The outer wall of the lower connector 6 has a sliding groove 61, such as... Figure 2 As shown, the unfolded schematic diagram of the slide 61 is as follows: Figure 2 As shown, the slide groove 61 is J-shaped and circumferentially arranged along the outer wall of the lower connector 6. It includes a snap-fit ​​position 611 and a release position 612. The outer cylinder 7 is fitted onto the connecting shaft 5. The upper end of the outer cylinder 7 is threadedly connected to the pressure cap 2. A sliding key 71 is provided on the inner wall of the outer cylinder 7. The sliding key 71 is slidably connected to the slide groove 61. Two sets of sliding keys 71 and slide grooves 61 are provided. Shear pin holes 9 are provided on the connecting shaft 5, the lower connector 6, and the outer cylinder 7. Figure 1 and Figure 3 As shown, the shear pin 8 is inserted into the shear pin hole 9.

[0039] The shock absorber release device of the present invention is placed entirely below the drilling shock absorber. When there is no stuck drill bit, it can be used as a drill rod. The upper connector 1 is axially hollow and connected to the lower connector 6, with no pressure loss.

[0040] In the initial state, the shear pin 8 is inserted and fixed to the connecting shaft 5, the lower connector 6, and the outer cylinder 7, and the sliding key 71 is placed... Figure 2 At position B1, which is directly below the snap-fit ​​position 611, the lower connector 6 and the outer cylinder 7 can move up and down or rotate with the upper connector 1.

[0041] When a jamming situation occurs, i.e., the lower connector 6 is stuck and cannot move, because the upper connector 1 is threadedly fixed to the connecting shaft 5, and the outer cylinder 7 is axially limited by bearing 4, bearing 3 and pressure cap 2, when the operator lifts the upper connector 1, the upper connector 1 and the outer cylinder 7 can be pulled upward synchronously. Under the action of the pulling force, the outer cylinder 7 and the connecting shaft 5 shear off the shearing pin 8 connected to the lower connector 6, and the sliding key 71 moves to the jamming position 611. Figure 2 (See position A1). Since the outer cylinder 7 and the lower connector 6 are fixed by the sliding key 71, the upper connector 1 can rotate independently under the drive of the upper drill string, and then perform a shock-disengagement operation under the action of the drilling shocker, helping the lower outer cylinder 7 and the lower connector 6 to disengage.

[0042] When the rotary shock fails to release the jamming device and the lower connector 6 is completely stuck and cannot be released, the shocker's release device enters the unjamming state. In the unjamming operation state, first stop the rotation of the upper connector 1, then push the upper connector 1 down. The upper connector 1 and the outer cylinder 7 move down synchronously, and the sliding key 71 moves from the jamming position 611 (…). Figure 2 It was dislodged and moved to position A1 as shown. Figure 2 At position B1, the upper connector 1 is then rotated. Since the pressure cap 2 is press-fitted and sealed to the first shaft section 11, and the sliding key 71 has disengaged from the snap-fit ​​position 611, the rotation of the upper connector 1 can drive the pressure cap 2 and the outer cylinder 7 to rotate synchronously. The sliding key 71 then... Figure 2 The middle B1 position is moved to the C1 position, and then the upper connector 1 is lifted. The upper connector 1 and the outer cylinder 7 move upward simultaneously. The sliding key 71 slides out through the release position 612, and the outer cylinder 7 is unlocked and separated from the lower connector 6.

[0043] Optionally, the outer cylinder 7 has two symmetrically arranged oil injection holes 72 on its outer periphery, which can be filled with grease to provide lubrication for bearing 3 and bearing 4.

[0044] The shock-operated unsticking device of this invention effectively solves the problems of high frictional resistance in horizontal wells or wells with large reach, where the pressure or tension applied during sticking cannot be effectively transmitted to the stuck point, resulting in a low success rate of unsticking. The upper connector 1 of the shock-operated unsticking device can rotate while applying vibration and pressure to the lower connector 6 below, converting static friction into rotational kinetic friction, reducing friction in horizontal wells or wells with large deviated angles, and improving the shock-operated unsticking force and the success rate of unsticking. Furthermore, if unsticking fails, rotating the upper connector 1 unlocks and separates the outer cylinder 7 from the lower connector 6, allowing the drill string above and below the device to detach without explosive loosening, reducing the risk of the shock-operated device becoming stuck in the well. The device has a simple overall structure, is easy to operate, effectively transmits the unsticking shock force, and significantly improves the success rate of unsticking.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A release device for a shock absorber, characterized in that, include: The upper connector (1) is installed below the drilling shock device. The upper connector (1) includes a first shaft section (11), a second shaft section (12) and a third shaft section (13) with different radial dimensions. The gland (2) is fitted onto the first shaft segment (11) and press-fitted into a sealed connection with the first shaft segment (11); Bearing 1 (3) is fitted onto the first shaft segment (11) and axially abuts against the pressure cap (2); Bearing 2 (4) is fitted onto the second shaft segment (12) and axially abuts against bearing 1 (3); The connecting shaft (5) is installed on the third shaft section (13) and axially abuts against the bearing (4); The lower connector (6) is fitted onto the connecting shaft (5). The outer wall of the lower connector (6) is provided with a sliding groove (61). The sliding groove (61) includes a snap-fit ​​position (611) and a disengagement position (612). The outer cylinder (7) is fitted onto the connecting shaft (5). The upper end of the outer cylinder (7) is connected to the pressure cap (2). The inner wall of the outer cylinder (7) is provided with a sliding key (71), which is slidably connected to the sliding groove (61). Shear pin (8) is inserted through the connecting shaft (5), the lower connector (6) and the outer cylinder (7); When the drill is stuck, the upper connector (1) and the outer cylinder (7) are pulled upward by force, the shear pin (8) breaks, the sliding key (71) is placed in the snap-fit ​​position (611), the outer cylinder (7) is snapped and fixed with the lower connector (6), and the upper connector (1) can be rotated and vibrated to release the stuck drill. In the drill-free state, push down the upper connector (1), and the upper connector (1) and the outer cylinder (7) move down synchronously so that the sliding key (71) disengages from the snap-fit ​​position (611). Then, rotate and move the upper connector (1) and the outer cylinder (7) up synchronously, and the sliding key (71) disengages from the disengagement position (612). The outer cylinder (7) separates from the lower connector (6).

2. The shock absorber release device according to claim 1, characterized in that, The groove (61) is J-shaped.

3. The shock absorber release device according to claim 1, characterized in that, The bearing 1 (3) is a radial ball bearing.

4. The shock absorber release device according to claim 1, characterized in that, The second bearing (4) is a thrust bearing.

5. The shock absorber release device according to claim 1, characterized in that, The connecting shaft (5), the lower connector (6) and the outer cylinder (7) are all provided with shear pin holes (9), and the shear pins (8) are inserted into the shear pin holes (9).

6. The shock absorber release device according to claim 1, characterized in that, A seal (21) is provided on the side of the gland (2) facing the first shaft segment (11).

7. The shock absorber release device according to claim 1, characterized in that, The connecting shaft (5) is threadedly connected to the third shaft segment (13).

8. The shock absorber release device according to claim 1, characterized in that, The outer cylinder (7) is threadedly connected to the pressure cap (2).

9. The shock absorber release device according to claim 1, characterized in that, The upper connector (1), the connecting shaft (5), and the lower connector (6) are axially hollow and connected.

10. The release device for a shock absorber according to claim 1, characterized in that, The outer cylinder (7) is provided with an oil injection hole (72) on its outer periphery.

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