CN200940451Y

CN200940451Y - Sleeve hydraulic variable diameter centralizer

Info

Publication number: CN200940451Y
Application number: CN 200520128294
Authority: CN
Inventors: 孙起昱; 舒尚文; 董国庆; 胡春梅; 张雨生; 陈祥久; 吴非
Original assignee: Drilling Engineering Technology Research Institute Of Zhongyuan Petroleum Exploration Bureau Sinopec
Current assignee: Drilling Engineering Technology Research Institute Of Zhongyuan Petroleum Exploration Bureau Sinopec
Priority date: 2005-11-23
Filing date: 2005-11-23
Publication date: 2007-08-29
Anticipated expiration: 2015-11-23

Abstract

A casing hydraulic variable diameter centralizer comprises a bulk, a liquid cylinder, a stop pushing lock, an elastic toxoplasma upending strip, an upending strip box and a fixing sleeve. A cone station shoulder is arranged on the pipe wall of the upper part of the bulk and the liquid cylinder is sleeved close to the bottom of the cone station shoulder. A ring cavity is formed between the bulk and the liquid cylinder and the ring cavity is connected with the hydraulic hole of the bulk. Two lock grooves are symmetrically arranged on the pipe wall of the liquid cylinder and the stop pushing lock pin is arranged in the blind hole of the liquid cylinder lock groove and the bulk. The fixing sleeve is connected with the lower part of the bulk by screws and the upending strip box is sleeved on the lower part of the liquid cylinder and the upper part of the fixing sleeve. The elastic toxoplasma upending strip is inserted in the upending strip box. When reaches the designed well depth the elastic upending strip will be distractes under the action of the pump pressure, which ensures that when the casing string gets down the casing string can successfully cross the old casing or the old borehole without embedding into the open hole shaft lining. The casing hydraulic variable diameter centralizer has good upending effect particularly to the mediacy of the open hole section of the casing of the horizontal well and the large displacement directional well.

Description

Sleeve pipe hydraulic pressure reducing centralizer

Technical field: the utility model relates to a kind of sleeve pipe hydraulic pressure reducing centralizer, belongs to the downhole tool technical field of using after the slim-hole sidetracked hole completion in the drilling engineering.

Background technology: at present, the casing stabbing board that is used for the drilling engineering construction mainly contains two types, a kind of is the arch centralizer of shape such as lantern housing, its external diameter is fixed, mainly by setting upright body, the righting strip and the mechanism that is locked form, during work, casing stabbing board is connected on the casing coupling with the bunch tube G.I.H, because this kind centralizer external diameter is bigger than sleeve pipe, and the sleeve pipe that the slim-hole sidetracked hole uses does not generally have box cupling, what make bunch tube in horizontal well and extended reach directional well is lowered to and trips out difficulty, influences cementing operation, increases operating risk; But also has a kind of reducing casing stabbing board, mainly form by joint, central tube, piston bush, fluid cylinder, righting arm etc., though it is simple in structure, external diameter is little, stable performance, but its righting arm is shaped as bar shaped, strut the back as umbrella, the easy embedding borehole wall when barefoot interval uses, can not guarantee sleeve pipe barefoot interval between two parties, do not satisfy the requirement of cementing quality and construction, thereby the use of the casing stabbing board of this structure there is certain limitation.

Summary of the invention: the purpose of this utility model is to exist in the problem that slim-hole sidetracked hole barefoot interval does not have centralizing function at existing casing stabbing board, and a kind of safe, reliable, assurance casing window sidetracking well completion rear sleeve sleeve pipe hydraulic pressure reducing centralizer placed in the middle is provided.

The utility model is made up of body, fluid cylinder, thrust lock, elastic bow-shaped righting strip, righting strip case and fixed cover, and the body upper/lower terminal is processed as casing threads, can directly be connected with following casing; On the tube wall of body top, be provided with a conical surface shoulder, near being with fluid cylinder under the conical surface shoulder, forming a ring cavity between fluid cylinder and the body, and communicate with hydraulic pressure hole on the body, symmetry has locked groove on the fluid cylinder tube wall, and the thrust lock pin places in the blind hole that locked groove on the fluid cylinder and body open; Fixed cover is by being threaded and the body bottom, and the lower end of fluid cylinder and the upper end of fixed cover are set with the righting strip case, has several square grooves along upper and lower righting strip case inner periphery symmetry, inserts elastic bow-shaped righting strip in the groove.

The invention effect: the utility model is after going into the well with tubing string, under the effect of pump pressure, the elasticity righting strip could be strutted, thereby, has less external diameter before going into well, guarantee fashionablely under the bunch tube can to pass through top old stuff pipe or old well smoothly, the elasticity righting strip be difficult for to embed the bore hole borehole wall in the stressed back of arching upward, and sets upright effectively, and especially the bore hole section casing centralization to horizontal well and extended reach directional well has good centralizing function.

Description of drawings: accompanying drawing 1 the is 4 " structure diagram of sleeve pipe hydraulic pressure reducing centralizer;

Accompanying drawing 2 is installed in sectional drawing on fluid cylinder and the body for the thrust lock pin;

Accompanying drawing 3 inserts the sectional drawing of righting strip case for the elasticity righting strip.

The specific embodiment: by accompanying drawing 1, accompanying drawing 2, accompanying drawing 3 as can be known, the utility model is by body 1,

fluid cylinder

3,2 elastic bow-shaped righting strips 6 are locked in thrust, last righting strip case 5, following righting strip case 9 and fixed cover 7 are formed, body 1 is an oval column jecket, on, following two ends are processed as casing threads, can directly be connected with following casing, on body 1 top tube wall, be provided with a conical surface shoulder, near being with fluid cylinder 3 under the conical surface shoulder, form a ring cavity between fluid cylinder 3 and the body 1, and communicate with hydraulic pressure hole 8 on the body 1, symmetry has locked groove on fluid cylinder 3 tube walls, and thrust lock pin 2 places in the blind hole that locked groove on the fluid cylinder 3 and body 1 opened; Fixed cover 7 is by screw thread socket and body 1 bottom, and the upper end of the lower end of fluid cylinder 3 and fixed cover 7 is respectively installed with righting strip case 5 and following righting strip case 9, has several square grooves along upper and lower

righting strip case

5,9 inner periphery symmetries, inserts elastic bow-shaped righting strip in the groove.

During use, casing stabbing board is installed in series in bunch tube, after sleeve pipe is lowered to the planned well section, throw steel ball sealing and be installed on special service valve block ring under, when turn on pump built the pressure or build the pressure the unlatching casing hanger, highly pressurised liquid entered ring cavity between fluid cylinder 3 and the body 1 by the hydraulic pressure hole 8 on the body 1, promote fluid cylinder 3 and go up righting strip case 5 to move down, thrust lock pin 2 locking fluid cylinders 3 do not fall back, and elastic bow-shaped righting strip 6 is arched upward be supported on the borehole wall, guarantee that casing centralization is in well.

Claims

1, a kind of sleeve pipe hydraulic pressure reducing centralizer, by body (1), fluid cylinder (3), thrust lock (2), elastic bow-shaped righting strip (6), last righting strip case (5), following righting strip case (9) and fixed cover (7) are formed, body (1) is an oval tubing string, on, following two ends are processed as casing threads, can directly be connected with following casing, it is characterized in that on the tube wall of body (1) top, being provided with a conical surface shoulder, near being with fluid cylinder (3) under the conical surface shoulder, form a ring cavity between fluid cylinder (3) and the body (1), and communicate with hydraulic pressure hole (8) on the body (1), symmetry has locked groove on fluid cylinder (3) tube wall, and thrust lock pin (2) places in the blind hole that locked groove on the fluid cylinder (3) and body (1) opened; Fixed cover (7) is connected to body (1) bottom by thread bush, the upper end of the lower end of fluid cylinder (3) and fixed cover (7) is respectively installed with righting strip case (5) and following righting strip case (9), have several square grooves along upper and lower righting strip case (5), (9) inner periphery symmetry, insert elastic bow-shaped righting strip (6) in the groove.