CN103670296B

CN103670296B - Casing stabbing board

Info

Publication number: CN103670296B
Application number: CN201210344718.3A
Authority: CN
Inventors: 齐月魁; 王晓梅; 秦飞翔; 董建华; 李勇
Original assignee: China Petroleum and Natural Gas Co Ltd
Current assignee: China Petroleum and Natural Gas Co Ltd
Priority date: 2012-09-18
Filing date: 2012-09-18
Publication date: 2016-03-09
Anticipated expiration: 2032-09-18
Also published as: CN103670296A

Abstract

The present invention relates to a kind of casing stabbing board, by body, wiper block I, wiper block II, wiper block III, wiper block IV, wiper block V and wiper block VI form, wherein, above-mentioned wiper block I, wiper block II, wiper block III, wiper block IV, wiper block V is identical with wiper block VI structure, between two to being called one section, body is divided into three sections from top to bottom, every section rotate successively 180 ° uniform and shrink in inboard wall of tube body, above-mentioned wiper block is by piston I, piston II, piston III, piston seat, retaining ring III, retaining ring II, retaining ring I, shear pin I, shear pin II, shear pin III and piston cap composition.This casing stabbing board is mainly used in high angle hole, the setting of casing of horizontal well, well cementing operation.

Description

Casing stabbing board

Technical field

The present invention relates to a kind of oil gas field completion practice centralizer.

Background technology

At present, in High angle or horizontal cementing process, drilling fluid is the key factor affecting cementing quality, under the pipe string that enters connects centralizer is the most effectual way improving drilling fluid.The casing stabbing board applied at present mainly contains elastic centralizer and rigid centralizer two kinds, all there is distinct disadvantage, elastic centralizer uprighting force quantity not sufficient, is difficult to the centralizer ensureing sleeve pipe, and under enter in process and very easily damage; Rigid centralizer external diameter is close to mineshaft diameter, and what be hampered in setting of casing process and block has a big risk, and is subject to the restriction of bore hole hole condition, and centralizing function is limited.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of casing stabbing board, enters in process the risk of the card that is hampered, can ensure again the drilling fluid in well cementing process under can reducing casing string.

For solving the problems of the technologies described above, casing stabbing board of the present invention, be made up of body 1, wiper block I 2, wiper block II 3, wiper block III 4, wiper block IV 5, wiper block V 6 and wiper block VI 7, wherein, above-mentioned wiper block I 2, wiper block II 3, wiper block III 4, wiper block IV 5, wiper block V 6 are identical with wiper block VI 7 structure, between two to being called one section, be divided into from top to bottom on body 1 three sections, every section rotate successively 180 ° uniform and shrink in body 1 inwall; Above-mentioned wiper block I 2, wiper block II 3, wiper block III 4, wiper block IV 5, wiper block V 6 and wiper block VI 7 form by piston I 21, piston II 22, piston III 23, piston seat 24, retaining ring III 25, retaining ring II 26, retaining ring I 27, shear pin I 28, shear pin II 29, shear pin III 30 and piston cap 31, piston seat 24 inwall is fluted, be embedded with retaining ring III 25, piston III 23 is connected by shear pin III 30 with piston seat 24; Piston III 23 inwall is fluted, is embedded with retaining ring II 26; Piston III 23 outer wall has lock tooth, engages lock with retaining ring III 25, and piston II 22 is connected by shear pin II 29 with piston III 23; Piston II 22 inwall is fluted, is embedded with retaining ring I 27; Piston II 22 outer wall has lock tooth, engages lock with retaining ring II 26, and piston I 21 is connected by shear pin I 28 with piston II 22; Piston I 21 top is welded with piston cap 31; Piston I 21 outer wall has lock tooth, and engage with retaining ring I 27 and lock, piston seat 24 is threaded with body 1.

Above-mentioned piston I 21, piston II 22, piston III 23, piston seat 24 is adjacent with body 1 is equipped with seal between the two.

Compared with present technical scheme, casing stabbing board of the present invention, before work, tool external diameter, much smaller than mineshaft diameter, can ensure that centralizer is lowered into safely precalculated position in pit shaft; After work, can expand according to borehole size, meet the requirement of well amplification degree 30%; And body resistance-strengthening tablets bearing capacity is strong, effectively can support the borehole wall, ensure that the centralizer of sleeve pipe, improve cementing quality.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

Fig. 1 is the structural representation of casing stabbing board of the present invention;

Fig. 2 is the structure for amplifying schematic diagram of wiper block in Fig. 1 (I--VI).

Detailed description of the invention

As shown in Figure 1, casing stabbing board of the present invention, mainly comprises body 1, wiper block I 2, wiper block II 3, wiper block III 4, wiper block IV 5, wiper block V 6, wiper block VI 7,6 wiper block structures is identical, be distributed on body 1.Before work, wiper block shrinks in body 1 inwall, guarantees that this centralizer external diameter is minimum, avoids in setting of casing process because of the construction hidden danger that centralizer outside dimension brings greatly.

As shown in Figure 2, above-mentioned wiper block I-VI includes piston I 21, piston II 22, piston III 23, piston seat 24, retaining ring III 25, retaining ring II 26, retaining ring I 27, shear pin I 28, shear pin II 29, shear pin III 30, piston cap 31.Piston seat 24 and body 1 are threaded connection, and inwall is fluted, is embedded with retaining ring III 25.Piston III 23 is connected by shear pin III 30 with piston seat 24, and piston III 23 inwall is fluted, is embedded with retaining ring II 26, and piston III 23 outer wall has lock tooth, engages with retaining ring III 25, and piston III 23 can only unidirectionally outwards be slided, and has locking anti-back function.Piston II 22 is connected by shear pin II 29 with piston III 23, and piston II 22 inwall is fluted, is embedded with retaining ring I 27, and piston II 22 outer wall has lock tooth, can engage with retaining ring II 26, and piston II 22 can only unidirectionally outwards be slided, and has locking anti-back function.Piston I 21 is connected by shear pin I 28 with piston II 22, and piston I 21 top is welded with piston cap 31; Piston I 21 outer wall has lock tooth, can engage with retaining ring I 27, and piston I 21 can only unidirectionally outwards be slided, and has locking anti-back function.Seal is all had to seal between piston I 21, piston II 22, piston III 23, piston seat 24, the adjacent two pieces of body 1.

Working method adopts hydraulic buckling, and process is: casing stabbing board is connected into casing string, is lowered into precalculated position in pit shaft, carries out cementing operation.After cementing job terminates, carry out liquid suppress casing string inside, under the effect of cover overpressure, shear pin I 28 is cut off, and piston I 21 and piston cap 31 are pushed out body 1, and piston I 21 engages with retaining ring I 27 and locks; Continue pressurization, shear pin II 29 is cut off, and piston II 22 drives piston I 21 by retaining ring I 27, piston cap 31 continues outwards to skid off, and piston II 22 engages with retaining ring II 26 and locks; Continue pressurization, shear pin III 30 is cut off, and piston III 23 drives piston II 22, piston I 21, piston cap 31 to continue outwards to skid off by retaining ring II 26, and piston III 23 engages with retaining ring III 25 and locks; Now the external diameter of casing stabbing board reaches maximum, and piston cap 31 contacts with the borehole wall, plays the effect of righting casing centralization.

Claims

1. a casing stabbing board, by body (1), wiper block I (2), wiper block II (3), wiper block III (4), wiper block IV (5), wiper block V (6) and wiper block VI (7) form, and it is characterized in that: described wiper block I (2), wiper block II (3), wiper block III (4), wiper block IV (5), wiper block V (6) is identical with wiper block VI (7) structure, between two to being called one section, body (1) is divided into three sections from top to bottom, every section rotate successively 180 ° uniform and shrink in body (1) inwall, described wiper block I (2), wiper block II (3), wiper block III (4), wiper block IV (5), wiper block V (6) and wiper block VI (7) are by piston I (21), piston II (22), piston III (23), piston seat (24), retaining ring III (25), retaining ring II (26), retaining ring I (27), shear pin I (28), shear pin II (29), shear pin III (30) and piston cap (31) composition, piston seat (24) inwall is fluted, is embedded with retaining ring III (25), and piston III (23) is connected by shear pin III (30) with piston seat (24), piston III (23) inwall is fluted, is embedded with retaining ring II (26), piston III (23) outer wall has lock tooth, and engage with retaining ring III (25) and lock, piston II (22) is connected by shear pin II (29) with piston III (23), piston II (22) inwall is fluted, is embedded with retaining ring I (27), piston II (22) outer wall has lock tooth, and engage with retaining ring II (26) and lock, piston I (21) is connected by shear pin I (28) with piston II (22), piston I (21) top is welded with piston cap (31), piston I (21) outer wall has lock tooth, and engage with retaining ring I (27) and lock, piston seat (24) is threaded with body (1).

2. casing stabbing board according to claim 1, is characterized in that: described piston I (21), piston II (22), piston III (23), piston seat (24) are adjacent with body (1) is equipped with seal between the two.