CN2550489Y

CN2550489Y - Variable diameter sleeve centralizer

Info

Publication number: CN2550489Y
Application number: CN 02240037
Authority: CN
Inventors: 李天群; 周记满; 朱长波; 高世勇
Original assignee: Daqing Petroleum Administration Bureau
Current assignee: Daqing Petroleum Administration Bureau
Priority date: 2002-07-08
Filing date: 2002-07-08
Publication date: 2003-05-14
Anticipated expiration: 2012-07-08

Abstract

The utility model relates to a structure belonging to a variable diameter casing centralizer in the oil well. Before cementing, firstly a lower rubber plug is pressed in, when displace mud enables the lower rubber plug to reach the shear pin 7 of the tool and be sheared, the hydraulic pressure hole is emerged, high pressure mud enters the inner ring cavity 12 of the hydraulic cylinder sleeve 5 through the hydraulic pressure hole, and drives a piston 6 to shear the shear pin 11, then the piston 6 drives a taper sleeve 4 upward to enable the righting major-minor arms to arch to a design angle, and then the piston 6 goes on moving upward to enable the righting arms to bulge further until the righting arms are closely attached to the well wall. When the pressure is balanced, the steel ball 14 in the hydraulic cylinder moves downward with the piston, and achieves automatic compact pin by the inclined plane effect on the inner wall of a cylinder body inner ring groove 13. The utility model has the advantages that because the righting arms are joined together before the tool enters the well, the utility model has a less external diameter which is the same as the external diameter of the casing, the sleeved-in resistance of the casing is very small; the reset force of the tool is very large, more particularly the utility model has a good righting function for the casing of the horizontal well to be in the middle.

Description

But reducing casing stabbing board

(1) technical field:

But the utility model belongs to the reducing casing stabbing board on the casing of down-hole, oil field.

(2) background technology:

At present, be the raising cementing quality in the drilling completion process, and on institute's setting of casing, be with centralizer, its shape is as like the lantern housing, its external diameter is certain, and this centralizer can't guarantee casing centralization to the irregular out-of-round oversized hole of hole diameter, does not satisfy the requirement of cementing quality and construction; Horizontal well and extended reach directional well bunch tube are lowered to difficulty, influence cementing operation, also do not have centralizing function.

(3) utility model content:

Technical problem to be solved in the utility model is at the problem that exists in the background technology, but and provides a kind of ground control reducing casing stabbing board.

The invention for solving the technical problem can reach by following technical solution: connecting central tube by joint screw thread on the casing down, principal arm is set upright in hinged 3 above bar shapeds on this joint outside center tubes, and extension spring is set between the arm; Piston bush, hydraulic cylinder are set outside the central tube lower body, one section ring cavity is arranged in the hydraulic cylinder body, between this chamber arm, central tube, be equipped with and cut off; Contact with hydraulic cylinder at piston bush and be shaped on the taper annular groove between the anchor ring on hydraulic cylinder, it is inherent upwards to be furnished with ball in week; At the piston bush end taper sheath is set on center tubes, sets upright auxiliary, set upright auxiliary and set upright between the principal arm hinged with the quantity bar shaped corresponding that have of taper sheath collocation with setting upright principal arm.

In such scheme, big towards its external diameter of taper annular groove end of joint.Design principle of the present utility model is that the transmission by the sleeve pipe internal pressure makes the major and minor arm of setting upright on the centralizer open by designing requirement, and righting arm is supported on this place's borehole wall and self-locking; And in the process under the centralizer lower going-into-well, righting arm closes up and the same external diameter of sleeve pipe, reduces to be lowered to resistance, thereby has solved the problem placed in the middle with irregular hole diameter sleeve pipe of being lowered to of bunch tube preferably, has improved safety of construction and well cementation sealing quality.

The utility model is compared with background technology has following beneficial effect: close up because this instrument is gone into the preceding righting arm of well, have less external diameter, with the same external diameter of sleeve pipe, it is very little that bunch tube is lowered to resistance; The reset force of this instrument is very big, and particularly the casing centralization to horizontal well has good centralizing function.Can regulate the external diameter of righting arm, have abdominous well to set upright better effects if hole diameter is irregular.

(4) description of drawings:

Accompanying drawing 1 is this centralizer installation drawing;

Accompanying drawing 2 is to set upright major and minor arm (3,9) the process status figure that goes into the well on Fig. 1;

Accompanying drawing 3 is to set upright major and minor arm (3,9) on Fig. 1 to go into the well and be lowered to the plug state diagram of arching upward after finishing;

Accompanying drawing 4 is hydraulic cylinder 5 half cut-away views on Fig. 1.

(5) specific embodiment:

Below in conjunction with the drawings and specific embodiments will the utility model is described in further detail:

On following casing,, on joint 1, set upright principal arm 3 in that central tube 8 is external, extension spring 10 is set between the arm with bearing pin 2 hinged 3 above bar shapeds by joint 1 central tube 8 that is threaded; Piston bush 6, hydraulic cylinder 5 are set outside central tube 8 lower body, one section ring cavity 12 is arranged in hydraulic cylinder 5 bodies, between this chamber arm, central tube 8, be equipped with and cut off 7; Contact with hydraulic cylinder 5 at piston bush 6 and be shaped on taper annular groove 13 between the anchor ring on hydraulic cylinder 5, it is inherent upwards to be furnished with ball 14 in week; On central tube 8 bodies, taper sheath 4 is set at piston bush 6 ends, sets upright auxiliary 9, set upright auxiliary 9 and set upright between the principal arm 3 hinged with the quantity bar shaped corresponding that have of taper sheath 4 collocation with setting upright principal arm 3.

In such scheme, big towards its external diameter of taper annular groove 13 ends of joint 1.Before well cementation, be pressed into bottom plug earlier, as shown in Figure 2, when for mud make bottom plug arrive this instrument cut off 7 the time, cut off this by pump pressure and cut off, expose the hydraulic pressure hole, high-pressure slurry enters ring cavity 12 in the hydraulic cylinder 5 by the hydraulic pressure hole, and promote piston 6 and cut off and cut off 11, it is up that piston 6 promotes taper sheath 4 again, makes to set upright major and minor arm and arch upward and be supported on the borehole wall, as shown in Figure 3, along with piston 6 continue go up enforcement righting arm further heave, till righting arm is close to the borehole wall thereafter.When pressure balance, steel ball in the fluid cylinder 14 moves down with piston, realizes locking automatically by the ramp effect on cylinder body inner groove 13 inwalls.

Claims

But 1, a kind of reducing casing stabbing board that relates on the oil well casing constitutes on following casing according to design, it is characterized in that:

A, on following casing by joint (1) central tube (8) that is threaded, central tube (8) external on joint (1) hinged 3 above bar shapeds set upright principal arm (3), extension spring (10) is set between the arm;

B, piston bush (6), hydraulic cylinder (5) are set outside central tube (8) lower body, in hydraulic cylinder (5) body one section ring cavity (12) are arranged, between this chamber arm, central tube (8), be equipped with and cut off (7); Contact with hydraulic cylinder (5) at piston bush (6) and on hydraulic cylinder (5), to be shaped on taper annular groove (13) between the anchor ring, its inherent ball (14) that upwards is furnished with in week;

C, hold on central tube (8) body at piston bush (6) taper sheath (4) is set, set upright auxiliary (9), set upright auxiliary (9) and set upright between the principal arm (3) hinged with the quantity bar shaped corresponding that have of taper sheath (4) collocation with setting upright principal arm (3).
2, centralizer according to claim 1 is characterized in that: the taper annular groove (13) towards joint (1) holds its external diameter big.