Anti-rotation grading hoop closing plug

Abstract

An anti-rotation grading hoop closing plug comprises a closing plug body and a plug seat and is characterized in that the plug seat is arranged at the lower end of the closing plug body in a sleeved mode, the upper portion of the closing plug body is an outer plug body, the lower portion of the closing plug body is an inner plug body, the inner plug body is inserted into the outer plug body, damping fins are arranged on the outer end face of the outer plug body, and an insertion column is arranged on the upper portion of the inner plug body. Clamping rings are arranged on the inner end face of the outer plug body, the clamping rings are embedded into the clamping rings, a fixing column is arranged on the lower portion of the inner plug body, wedge-shaped blocks are arranged on the end face of the fixing column in an array mode, clamping grooves are formed in the plug seat in an array mode, and after well cementation operation is completed, a drill bit descends to a designed position to make contact with a rubber plug body of the closing plug. The rubber plug body rotates along with rotation and downward pressure of the drill bit. And when the rubber plug body rotates to a proper position, the convex conical surface is embedded into the rectangular groove of the closing plug seat. Therefore, circumferential positioning of the closing plug and the closing plug seat is guaranteed. At the moment, the drill bit can drill off the closing plug rapidly, and manpower and material resources are greatly saved.

Description

Technical Field

[0001] The utility model relates to the field of cementing operations, in particular to an anti-transformation grading hoop closing plug. Background Art

[0002] At present, most shallow layers of oil fields have been explored and developed. In order to obtain more oil and gas reserves and development output, only medium-deep wells, deep wells and ultra-deep wells can be deployed for exploration and production. In medium-deep wells, deep wells and ultra-deep wells, due to the large upper and lower intervals of oil and gas layers, gas and formation water corrosion on casing, etc., it is necessary to implement sealing technology for the entire well.

[0003] In the past, the whole well was usually sealed by using conventional cement one-time return cementing technology, which often caused leakage. In the worst case, the cement return height was not high enough, and in the worst case, the upper oil layer was not sealed. The use of low-density high-strength cement for one-time return cementing technology can meet the cementing construction requirements of some wells, but because the bonding strength of low-density high-strength cement is low, it is easy to be crushed and squeezed during the later fracturing construction. At the same time, the cost of low-density high-strength cement is also very high. Therefore, the one-time return cementing technology can no longer meet the cementing requirements, and most oilfield companies' development plans require that oil and gas wells with a vertical depth of more than 2,500 meters must be cemented using a graded cementing technology.

[0004] The staged cementing process requires the use of staged collars. At present, the grouting holes on the staged collars are usually sealed by plug sleeves. After the first-level cementing is completed, the grouting holes need to be opened, and the second-level cementing operation is carried out after the grouting holes are opened. After the second-level cementing grouting is completed, the closing plug is put in, and the closing plug is hydraulically displaced to the closing plug seat of the staged collar for composite collision and pressure. After the collision and pressure is completed, wait for the cement to solidify, and then drill out the core.

[0005] After the conventional grading collar closing plug is put into the casing, it reaches the location of the grading collar and performs composite collision and pressure with the closing plug seat in the grading collar body. At this time, the closing plug and the closing plug seat are axially positioned, but not circumferentially positioned. In the subsequent drilling and removal operation, the drill bit and the closing rubber plug are integrated when in contact, and relative rotation occurs with the closing plug seat, making it impossible to drill and remove the closing plug. This phenomenon will greatly prolong the time of the drilling and removal operation, resulting in a waste of manpower and material resources.

[0006] Beneficial effect: After the closing plug of this scheme is lowered to the designed position, the annular damping plate inclined and protruding at the side end of the plug body forms a reverse damping force with the well wall. At this time, the upper rubber bowl of the closing plug is subjected to the positive pressure from above the wellhead, which can ensure normal cementing operations.

[0007] After the cementing operation is completed, the drill bit is lowered to the designed position to contact the plug body of the shut-off plug. As the drill bit rotates and the downward pressure is applied, the plug body rotates accordingly. When the plug body rotates to the appropriate position, the protruding conical surface is embedded in the rectangular groove of the shut-off plug seat. This ensures that the shut-off plug and the shut-off plug seat are circumferentially positioned. At this time, the drill bit can drill out the shut-off plug quickly, greatly saving manpower and material resources. Utility Model Content

[0008] The utility model provides an anti-transformation grading hoop closing plug, which is used to solve the technical problems in the above-mentioned background technology.

[0009] A type of anti-transformation graded hoop closing plug, comprising a closing plug and a plug seat, characterized in that the plug seat is sleeved on the lower end of the closing plug, the upper part of the closing plug is an outer plug body, and the lower part is an inner plug body, the inner plug body is inserted and arranged inside the outer plug body, a damping plate is arranged on the outer end surface of the outer plug body, the upper part of the inner plug body is an insertion column, a clamp is arranged on the end surface of the insertion column, a clamp is arranged on the inner end surface of the outer plug body, the clamp is embedded in the contact clamp, the lower part of the inner plug body is a fixed column, the end surface array of the fixed column is provided with a wedge block, and the plug seat array is provided with a clamping groove.

[0010] Preferably, an anti-transformation grading hoop closing plug is characterized in that a rubber bowl is provided at the upper end of the outer plug body, and the rubber bowl is open.

[0011] Preferably, an anti-transformation grading hoop closing plug is characterized in that the side end surface damping plate of the outer plug body is inclined upward.

[0012] Preferably, an anti-transformation grading hoop closing plug is characterized in that the inner diameter of the plug seat is consistent with the outer diameter of the fixing column of the inner plug body.

[0013] Preferably, an anti-transformation grading hoop closing plug is characterized in that the card slot is arranged on the upper part of the plug seat.

[0014] Beneficial effect: After the closing plug of this scheme is lowered to the designed position, the annular damping plate inclined and protruding at the side end of the plug body forms a reverse damping force with the well wall. At this time, the upper rubber bowl of the closing plug is subjected to the positive pressure from above the wellhead, which can ensure normal cementing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 It is a three-dimensional diagram of the utility model;

[0017] Figure 2 This is a three-dimensional diagram of the closing plug of the utility model;

[0018] Figure 3 This is a dissection diagram of the closing plug of the utility model;

[0019] Figure 4 This is a three-dimensional diagram of the outer plug body of the utility model;

[0020] Figure 5 This is a dissection diagram of the outer plug body of the utility model;

[0021] Figure 6 This is a three-dimensional diagram of the inner plug body of the utility model;

[0022] Figure 7 It is a three-dimensional diagram of the plug seat of the utility model.

[0023] In the figure: closing plug 1, outer plug body 101, retaining ring 1011, inner plug body 102, insertion column 1021, clamp 1022, fixing column 1023, wedge block 1024, damping plate 103, rubber bowl 104, plug seat 2, and slot 201. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] It should be noted that, in the description of the present invention, unless otherwise specified, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inside", "outside", "front end", "rear end", "head", "tail" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The "setting" conjunction designed in this scheme is a broad connection definition, and its connection methods may include "welding", "integral forming", "bolting" and other connection methods.

[0026] according to Figure 1-6As shown, a transformation-proof graded hoop closing plug comprises a closing plug 1 and a plug seat 2, characterized in that the plug seat 2 is sleeved on the lower end of the closing plug 1, the upper part of the closing plug 1 is an outer plug body 101, and the lower part is an inner plug body 102, the inner plug body 102 is inserted and arranged inside the outer plug body 101, the outer end surface of the outer plug body 101 is arranged with a damping plate 103, the upper part of the inner plug body 102 is an insertion column 1021, the end surface of the insertion column 1021 is arranged with a clamp 1022, the inner end surface of the outer plug body 101 is arranged with a clamp ring 1011, the clamp 1022 is embedded in the contact clamp ring 1011, the lower part of the inner plug body 102 is a fixed column 1023, the end surface array of the fixed column 1023 is provided with a wedge block 1024, and the plug seat 2 is provided with a card groove 201 array.

[0027] Furthermore, a rubber bowl 104 is provided at the upper end of the outer plug body 101, and the rubber bowl 104 is open.

[0028] Furthermore, the side end surface damping plate 103 of the outer plug body 101 is inclined upward.

[0029] Furthermore, the inner diameter of the plug seat 2 is consistent with the outer diameter of the fixing column 1023 of the inner plug body 102 .

[0030] Furthermore, the card slot 201 is arranged on the upper part of the plug seat 2 .

[0031] The present invention comprises a closing plug 1 and a plug seat 2. The plug seat 2 is sleeved on the lower end of the closing plug 1. The closing plug 1 is provided with an outer plug body 101 and an inner plug body 102. The inner plug and the outer plug are hard rubber bodies. An open rubber bowl 104 is provided on the upper part of the outer plug body 101 to withstand the positive pressure from the top of the wellhead to ensure the normal operation of the cementing work. An annular damping plate 103 is provided on the outer end face of the outer plug body 101. The damping plate 103 is inclined upward. The damping plate 103 forms a reverse damping force with the well wall and will not pop out due to the reverse pressure in the well. A retaining ring 1011 is arranged at the inner end of the outer plug body 101. The inner plug body 102 The upper part is provided with an insertion column 1021, which is inserted into the middle part of the outer plug body 101. The outer end surface of the insertion column 1021 is arranged with a clamp 1022, which is clamped into the clamp ring 1011. The lower part of the outer plug body 101 is extended with a fixed column 1023, and the side end surface of the fixed column 1023 is arrayed with a wedge block 1024. The outer end of the fixed column 1023 is sleeved with a plug seat 2, which is annular. The upper part of the plug seat 2 is arrayed with a card slot 201, and the number and position of the card slot 201 are consistent with the number and position of the wedge block 1024. After the cementing operation is completed, the drill bit is lowered to the designed position to contact the outer plug body of the closing plug. With the rotation of the drill bit and the downward pressure, the closing plug rotates accordingly. When the closing plug 1 is turned to the appropriate position, the protruding wedge block 1024 is embedded in the card slot 201 of the plug seat. Thereby ensuring that the closing plug 1 and the plug seat 2 are circumferentially positioned. At this time, the drill bit can drill out the closing plug 1 relatively quickly, which greatly saves manpower and material resources.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shut-off plug with an anti-transformation grading hoop, comprising a shut-off plug (1) and a plug seat (2), characterized in that The plug seat (2) is sleeved on the lower end of the closing plug (1); the upper part of the closing plug (1) is an outer plug body (101), and the lower part is an inner plug body (102); the inner plug body (102) is inserted into the outer plug body (101); the outer end surface of the outer plug body (101) is provided with a damping plate (103); the upper part of the inner plug body (102) is an insertion column (1021); the end surface of the insertion column (1021) is provided with a clamp (1022); the inner end surface of the outer plug body (101) is provided with a clamp ring (1011); the clamp ring (1022) is embedded in the contact clamp ring (1011); the lower part of the inner plug body (102) is a fixed column (1023); the end surface of the fixed column (1023) is provided with a wedge block (1024); and the plug seat (2) is provided with a clamping groove (201).

2. The anti-transformation grading hoop closing plug according to claim 1 is characterized in that A rubber bowl (104) is provided at the upper end of the outer plug body (101), and the rubber bowl (104) is open.

3. The anti-transformation grading hoop closing plug according to claim 1 is characterized in that The side end surface damping plate (103) of the outer plug body (101) is inclined upward.

4. The anti-transformation grading hoop closing plug according to claim 1 is characterized in that The inner diameter of the plug seat (2) is consistent with the outer diameter of the fixing column (1023) of the inner plug body (102).

5. The anti-transformation grading hoop closing plug according to claim 1 is characterized in that The clamping groove (201) is arranged on the upper part of the plug seat (2).

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