Double-acting full-hydraulic jar while drilling

Abstract

The utility model discloses a double-acting full-hydraulic while-drilling jar, and relates to the technical field of while-drilling jarring, the double-acting full-hydraulic while-drilling jar comprises an outer cylinder piece and a core shaft slidably sleeved in the outer cylinder piece, the end part of the outer cylinder piece is provided with a lower joint, an anti-turnover spline structure is arranged between the core shaft and the outer cylinder piece, the outer cylinder piece is composed of a plurality of sections of valve outer cylinders, adjacent valve outer barrels are connected through a transition connector, the front end and the rear end of the transition connector are additionally provided with an upper valve body and a lower valve body respectively through sealing bodies, axial through grooves are formed in the circumferential faces of the upper valve body and the lower valve body, oil injection holes communicated with the outside are formed in the valve outer barrels, and throttling channels communicated with the inside and the outside are formed in the sealing bodies. The throttling channel which is communicated in the radial direction is formed in the sealing body, the multiple axial through grooves are formed in the circumferential direction of the valve body, and a more stable pressure building channel is formed by means of the axial through grooves and the throttling channel; the second sealing structure and the third sealing structure are arranged on the mandrel and the pressure building area, so that the sealing performance of the fit clearance is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of a while-drilling jar, in particular to a double-acting full-hydraulic while-drilling jar. BACKGROUND

[0002] In drilling operations, due to the complexity of geological structure, improper technical measures and various factors such as mud, pipe string and borehole, accidents of stuck drill pipe often occur, that is, so-called "stuck pipe". The stuck pipe has a great impact on drilling operations, not only consumes a long time and loses drilling footage, but also may worsen the accident and even lead to abandonment of the oil and gas well. The while-drilling jar is a downhole tool designed to solve this problem, which is connected in the drill pipe and drilled together with the drill string, and is an ideal tool indispensable for directional wells, complex wells and deep wells. When the drill pipe is stuck during drilling or tripping, the while-drilling jar can provide an upward or downward strong jar force to the stuck point, so as to loosen the stuck point and achieve the purpose of rapid unblocking. The while-drilling jar is mainly divided into mechanical and hydraulic types: the mechanical while-drilling jar relies on the energy storage and release of elastic sleeves or springs and other mechanical elements to generate jar force, and has the advantages of simple structure, reliable operation and adaptation to various working conditions; the hydraulic while-drilling jar uses the damping action of hydraulic fluid flowing in a small flow channel as a locking mechanism, and releases energy through sudden changes in the flow channel to generate jar force. The jar effect of the hydraulic jar can be adjusted by the operation of the driller, and the use is more flexible.

[0003] The patent application No. CN 118639977A discloses a single-cavity double-stroke jar, which comprises a shell, the shell comprises a driving cavity, a hydraulic cavity, an upper connecting short section, a stop cavity, a lower connecting short section, a lower balance cavity, a locking device and a lower joint which are connected in sequence; a knocking short section is installed in the hydraulic cavity, a spline spindle is installed on the upper side of the knocking short section, an upper stop spindle is installed on the lower side of the knocking short section, and a lower stop spindle is installed on the lower side of the upper stop spindle; the disadvantage is that the existing jar has an internal and external communication cavity, and the drilling fluid carrying rock debris can enter the cavity through the air passage on the valve body, which causes erosion to the sealing element and the spindle, affecting the service life of the tool; since the existing valve needle throttling structure is adopted, the gap between the valve needle and the small hole of the valve body is easily blocked by impurities in the hydraulic oil and debris generated by friction between the spindle and the valve body, so that the jar is completely disabled and cannot jar. SUMMARY

[0004] The device provides a double-acting full-hydraulic while-drilling jar, and the specific implementation manner is as follows:

[0005] A double-acting full-hydraulic while-drilling jar comprises:

[0006] The outer cylinder and the core shaft slidingly arranged in the inner part of the outer cylinder are provided with a lower joint at the end of the outer cylinder, and the key structure preventing rotation is arranged between the core shaft and the outer cylinder, and a plurality of sealing structures are arranged at the sliding part of the outer cylinder and the core shaft.

[0007] The outer cylinder is composed of a plurality of valve outer cylinders, and the adjacent valve outer cylinders are connected through a transition joint.

[0008] The valve outer cylinder is provided with an oil injection hole communicating with the outside, and the sealing body and the valve outer cylinder are provided with a matching gap.

[0009] Based on the above technical scheme, the flow channel of the pressure holding stroke area is designed as a combination of the axial through groove and the throttle channel, which improves the stability of the sealing body and the valve body as a whole.

[0010] Preferably, the outer cylinder is integrated with a righting outer cylinder at one end, and the inner teeth of the righting outer cylinder are provided with a key groove in the circumferential direction.

[0011] Preferably, the sliding part of the righting outer cylinder and the core shaft is provided with a variable-diameter abutting limiting structure.

[0012] Based on the above technical scheme, the key groove and the key on the core shaft are slidingly connected, so that the core shaft can only stably move axially relative to the righting outer cylinder.

[0013] Preferably, the core shaft axially penetrates the inner side of the valve outer cylinder, and the front and rear sides of the penetration part are respectively provided with a second sealing structure and a third sealing structure slidingly matched with the inner side of the valve outer cylinder.

[0014] Preferably, the second sealing structure is provided with a plurality of wear-resistant rings and a first outer inclined check ring in sequence from outside to inside along the length direction of the core shaft.

[0015] Preferably, the third sealing structure is provided with a hole mud scraping ring, a shaft Gley ring and a second outer inclined check ring in sequence from outside to inside along the length direction of the core shaft.

[0016] Based on the above technical scheme, the second sealing structure and the third sealing structure are respectively arranged at two ends of the jar, the second sealing structure focuses on resisting high-pressure impact and friction and wear, and is used for a high-pressure input end, the third sealing structure focuses on preventing pollution and dynamic sealing, and is suitable for an output end vulnerable to impurity intrusion, the two-end sealing functions of the second sealing structure and the third sealing structure are complementary, and overall adaptability is significantly improved, the second sealing structure is formed by a plurality of wear-resistant rings arranged from outside to inside and forming a stepped pressure-resistant barrier, medium pressure is gradually reduced, and impact on a core sealing area is reduced, the mud scraping ring in the hole of the third sealing structure preferentially removes impurities on the surface of the mandrel, the Glay ring provides elastic sealing for the shaft, and the second outer blocking ring further blocks the intrusion of external pollutants.

[0017] Preferably, the righting outer cylinder is arranged at the end of the outer cylinder piece, and the first sealing structure is slidably arranged between the righting outer cylinder and the mandrel; the first sealing structure is sequentially provided with a shaft mud scraping ring, a hole Glay ring, a guide sleeve, an inner inclined blocking ring and a guide sleeve from outside to inside along the length direction of the mandrel.

[0018] Based on the above technical scheme, the hole Glay ring is installed in the groove of the hole of the jar, and the gap is filled by elastic deformation to prevent leakage of hydraulic oil, gas or other media; meanwhile, the Glay ring can withstand bidirectional pressure, and can effectively seal whether it is internal pressure or external pressure, and the Glay ring can also absorb part of the impact energy, reduce damage to the equipment, prolong the service life of the jar through the buffering effect.

[0019] Preferably, the arrangement structures of the axial through grooves on the upper valve body and the lower valve body are the same, and taking the arrangement between the axial through grooves and the lower valve body as an example, the axial through grooves are equidistantly arranged in the circumferential direction of the lower valve body.

[0020] In summary, the present application has the following beneficial technical effects:

[0021] 1. The utility model discloses a throttling channel radially leading through is arranged on the sealing body, a plurality of axial through grooves are arranged in the circumferential direction of the valve body, and a more stable pressure holding channel is formed by the axial through grooves and the throttling channel.

[0022] 2. The utility model discloses a second sealing structure and a third sealing structure are arranged on the mandrel and the pressure holding area, a plurality of wear-resistant rings and a first outer inclined blocking ring form a high-pressure impact barrier at the second sealing end, and a mud scraping ring, a Glay ring and a second outer inclined blocking ring realize dynamic sealing and anti-pollution at the third sealing end, and the two ends are adapted to complex working conditions.

[0023] 3. The utility model discloses a simple structure, a first sealing structure is arranged at the matching end of the mandrel and the outer cylinder piece to further improve the sealing effect, and the durability of the sliding matching part is improved by the shaft mud scraping ring and the wear-resistant ring. DRAWINGS

[0024] Figure 1 is a sectional view of the utility model structure;

[0025] Figure 2 is the utility model's explosion structure schematic diagram;

[0026] Figure 3 is the utility model's outer tube structure schematic diagram Figure 1 ;

[0027] Figure 4 is the utility model's outer tube structure schematic diagram Figure 2 ;

[0028] Figure 5 is the utility model's outer tube explosion structure schematic diagram;

[0029] Figure 6 is the utility model's outer tube and mandrel explosion structure schematic diagram;

[0030] Figure 7 is the utility model's first sealing structure schematic diagram;

[0031] Figure 8 is the utility model's second sealing structure sectional schematic diagram;

[0032] Figure 9 is the utility model's third sealing structure sectional schematic diagram;

[0033] Figure 10 is the utility model's pressure holding stroke area structure sectional schematic diagram.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1, outer tube, 2, lower joint, 3, mandrel, 4, first sealing structure, 5, second sealing structure, 6, third sealing structure, 7, sealing body, 8, upper valve body, 9, lower valve body, 10, axial through slot,

[0036] 101, transition joint, 102, valve outer tube, 103, centralizing outer tube, 104, oil injection hole, 301, spline, 302, first inclined transition surface, 401, guide sleeve, 402, inner inclined check ring, 403, hole grommet, 404, shaft mud scraping ring, 501, first outer inclined check ring, 502, wear ring, 601, second outer inclined check ring, 602, shaft grommet, 603, hole mud scraping ring, 701, throttling channel,

[0037] 1031, spline groove, 1032, second inclined transition surface. DETAILED DESCRIPTION

[0038] The utility model discloses a specific implementation mode in combination with the drawings and examples is described below:

[0039] It should be noted that the structure, proportion, size, etc. shown in the drawings of the present application are only used to understand and read the disclosed content by those skilled in the art, and are not used to limit the implementation of the present application. Any modification of the structure, change of the proportion relationship or adjustment of the size, which does not affect the function and purpose of the present application, should still fall within the scope of the disclosed technology.

[0040] Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present application are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship without substantial change of the technical content should also be considered as the scope of the present application.

[0041] The following will be described in detail with reference to the accompanying drawings. Figures 1-10 The present application will be further described in detail.

[0042] The present application discloses a double-acting full hydraulic type while-drilling jar.

[0043] Embodiment 1

[0044] Referring to Figures 1 to 10 The present application discloses a while-drilling jar, which comprises an outer cylinder 1 and a mandrel 3 slidingly sleeved in the inner part of the outer cylinder 1, the end part of the outer cylinder 1 is provided with a lower joint 2, the mandrel 3 and the outer cylinder 1 are provided with a spline structure for preventing rotation, and a plurality of sealing structures are arranged at the sliding parts of the outer cylinder 1 and the mandrel 3. In the structure, the outer cylinder 1 is composed of two valve outer cylinders 102, the adjacent valve outer cylinders 102 are connected through a transition joint 101, the front and rear ends of the transition joint 101 are respectively provided with an upper valve body 8 and a lower valve body 9 through a sealing body 7, and the peripheral surfaces of the two are provided with axial through grooves 10, the valve outer cylinder 102 is provided with an oil injection hole 104 communicating with the outside, the sealing body 7 and the valve outer cylinder 102 are left with a fitting gap, and the sealing body 7 is provided with an internal and external communication throttling channel 701, the inner side of the sealing body 7 at the positions of the upper valve body 8 and the lower valve body 9, the throttling channel 701, the axial through groove 10 and the oil injection hole 104 form a bidirectional pressure build-up stroke area, the arrangement structures of the axial through grooves 10 on the upper valve body 8 and the lower valve body 9 are the same, and the arrangement between the axial through groove 10 and the lower valve body 9 is taken as an example, the axial through groove 10 is equidistantly provided with a plurality of strips along the circumference of the lower valve body 9.

[0045] The outer cylinder 1 is integrated with a one-end centralizing outer cylinder 103, the centralizing outer cylinder 103 is provided with a spline groove 1031 in the circumferential direction, the spline groove 1031 is in sliding connection with the spline 301 on the core shaft 3, and the sliding positions of the centralizing outer cylinder 103 and the core shaft 3 are provided with a variable-diameter abutting limiting structure, the centralizing outer cylinder 103 is provided with a second inclined transition surface 1032, and the core shaft 3 is provided with a first inclined transition surface 302 which is inclined in the same direction as the second inclined transition surface 1032.

[0046] Specific implementation process is as follows: during operation, the core shaft 3 is axially slid relative to the outer cylinder 1, and the spline 301 limits the anti-rotation between the outer cylinder 1 and the core shaft 3; with the reciprocating axial movement of the core shaft 3; the while-drilling jar releases energy through sudden change of the flow channel to generate a jar force, so as to make the drill unblocked.

[0047] Embodiment 2

[0048] Reference Figures 5 to 10 The embodiment discloses a while-drilling jar, and the sealing structure comprises a first sealing structure 4, a second sealing structure 5 and a third sealing structure 6, the core shaft 3 axially penetrates the inner side of the valve outer cylinder 102, and the front and rear sides of the penetration part are respectively provided with the second sealing structure 5 and the third sealing structure 6 which are in sliding cooperation with the inner side of the valve outer cylinder 102, the second sealing structure 5 is provided with a plurality of wear-resistant rings 502 and a first outer inclined check ring 501 from outside to inside along the length direction of the core shaft 3, and the third sealing structure 6 is provided with a hole mud scraping ring 603, a shaft Galy ring 602 and a second outer inclined check ring 601 from outside to inside along the length direction of the core shaft 3.

[0049] The centralizing outer cylinder 103 is arranged at the end of the outer cylinder 1, and the first sealing structure 4 is in sliding connection between the centralizing outer cylinder 103 and the core shaft 3, the first sealing structure 4 is provided with a shaft mud scraping ring 404, a hole Galy ring 403, a guide sleeve 401, an inner inclined check ring 402 and the guide sleeve 401 from outside to inside along the length direction of the core shaft 3.

[0050] Many other changes and modifications can be made to the application without departing from the spirit and scope of the application. It should be understood that the application is not limited to the specific embodiments described herein, but the scope of the application is defined by the appended claims.

Claims

1. A dual acting, full hydraulic, while-drilling jar, characterized by, The utility model relates to a valve outer tube and core shaft anti-rotation structure, including: The outer cylinder piece (1) and the core shaft (3) of sliding sleeve are set in it, the outer cylinder piece (1) end is equipped with lower joint (2), the core shaft (3) with the outer cylinder piece (1) between be equipped with the spline structure of preventing rotation, and the sliding of outer cylinder piece (1) with the core shaft (3) is equipped with a plurality of sections sealing structure; The outer cylinder piece (1) is by multiple valve outer tube (102) composition, adjacent the valve outer tube (102) between through transition joint (101) connection, the front, rear end of transition joint (101) is equipped with upper valve body (8) and lower valve body (9) through sealing body (7) addition respectively, and both circumferential surface all are equipped with axial through slot (10); The valve outer tube (102) is equipped with oil injection hole (104) on and communicates with outside, and the sealing body (7) and the valve outer tube (102) between leave cooperation gap, and the sealing body (7) is equipped with inner, outer communication throttling passage (701), the sealing body (7) inside, throttling passage (701), axial through slot (10) and oil injection hole (104) between the position of upper valve body (8) and lower valve body (9) form two-way pressure build-up stroke area.

2. The dual acting, full hydraulic, while-drilling jar of claim 1, wherein, The outer cylinder piece (1) is integrated with one end centralizing outer cylinder (103), the inner tooth of centralizing outer cylinder (103) is equipped with spline groove (1031) along the circumference, and the spline groove (1031) is slidably connected with the spline (301) on the core shaft (3).

3. The dual acting, full hydraulic, while-drilling jar of claim 2, wherein, The sliding part of the centralizing outer cylinder (103) and the core shaft (3) is provided with a variable-diameter abutting limiting structure. The centralizing outer cylinder (103) is provided with a second inclined transition surface (1032), and the core shaft (3) is provided with a first inclined transition surface (302) inclined in the same direction as the second inclined transition surface (1032) at the corresponding position.

4. The dual acting, full hydraulic, while-drilling jar of claim 1, wherein, The core shaft (3) axially penetrates the inner side of the valve outer tube (102), and a second sealing structure (5) and a third sealing structure (6) are respectively arranged on the front and rear sides of the penetration part and slidably fit with the inner side of the valve outer tube (102).

5. The dual acting, full hydraulic, while-drilling jar of claim 4, wherein, The second sealing structure (5) is sequentially provided with a plurality of wear-resistant rings (502) and a first outer inclined check ring (501) from outside to inside along the length direction of the core shaft (3).

6. The dual acting, full hydraulic, while-drilling jar of claim 4, wherein, The third sealing structure (6) is sequentially provided with a hole mud scraping ring (603), a shaft Gleason ring (602), and a second outer inclined check ring (601) from outside to inside along the length direction of the core shaft (3).

7. The dual acting, full hydraulic, while-drilling jar of claim 2, wherein, The centralizing outer cylinder (103) is arranged at the end of the outer cylinder piece (1), and a first sealing structure (4) is slidably arranged between the centralizing outer cylinder (103) and the core shaft (3). The first sealing structure (4) is sequentially provided with a shaft mud scraping ring (404), a hole Gleason ring (403), a guide sleeve (401), an inner inclined check ring (402), and a guide sleeve (401) from outside to inside along the length direction of the core shaft (3).

8. The dual acting, full hydraulic, while-drilling jar of claim 1, wherein, The axial through grooves (10) are arranged on the upper valve body (8) and the lower valve body (9) in the same structure, and the arrangement between the axial through grooves (10) and the lower valve body (9) is taken as an example, the axial through grooves (10) are equidistantly arranged along the circumference of the lower valve body (9).

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