CN201358755Y

CN201358755Y - Underground switch slide bushing

Info

Publication number: CN201358755Y
Application number: CNU2009200886375U
Authority: CN
Inventors: 刘汝福; 王隆慧; 李洪春; 冯波; 李英; 马祥凤; 杨有林
Original assignee: Oil Production Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Current assignee: Oil Production Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Priority date: 2009-02-17
Filing date: 2009-02-17
Publication date: 2009-12-09
Anticipated expiration: 2019-02-17

Abstract

The utility model relates to an underground switch slide bushing, belonging to the technical field of underground tools used in construction of measures for increasing production and injection. The underground switch slide bushing comprises an upper connector, a central tube, a sealing piston, a pressure difference piston, a spring and a pressure adjusting cap. A step is arranged on the inner wall of the middle part of the central tube; the inner diameter of the step is smaller than the inner diameter of the upper end part of the central tube; the outer part of the pressure difference piston is a diameter-variable structure which is installed on the inner wall of the upper part of the central tube through shear pins; the lower part of the pressure difference valve is in clearance fit with the step at the middle part of the central tube; seal rings are respectively installed at the upper end and the lower end of the pressure difference piston; the pressure adjusting cap is installed at the lower end of the central tube through screw threads and is fixed by a stabilizing pin; a sealing piston and the spring are sleeved at the outer wall of the central tube between the pressure adjusting cap and the upper connector; and a liquid outlet communicated with an annular room formed by the central tube and the pressure difference piston is arranged on the central tube, corresponding to the sealing piston. In the construction of a stepping shaft in an oil field, after the strings are put in the right places, the oil casings can be communicated by punching through the strings; after the stepping shaft is finished, the punching process can be stopped. In this way, the annular room of the oil casings can be obstructed to prevent foundation fluid from entering the strings, thus realizing maintaining the pressure of the ground.

Description

The down-hole switch sliding sleeve

Technical field:

The utility model relates to a kind of down-hole switch sliding sleeve, belong to the downhole tool technical field in the measures constructions such as oilfield stimulation, augmented injection, be specially adapted to separate stratum fracfturing, seperated layer water injection, layering and squeeze and block up, test cover, test and leakage wait the down-hole switch sliding sleeve that is used for oil jacket connection behind the packer setting in the technical field.

Background technology:

At present in oil field layering measure technology, test cover, test and leakage wait the down-hole switch instrument that often uses various oil jackets connections in the tubing string, as level pressure sliding sleeve, sandblaster, coupling cock etc., do not open when existence need be opened or open after can't help doing the situation of pressure need oppositely build the pressure the time, influenced the oil field construction operation.200520106918.0 (the two sliding sleeve sandblasters) announced of patent for example, owing to need pitching just can suppress after putting in place under its Structural Design Requirement instrument, fluid course is opened, when situation such as foul, sand production is arranged for pit shaft, had after the not in place or pitching of pitching problems such as the stand-by period is long; When the appearance pitching was not in place, tubing string can not beaten pressure, and the supporting packer of tubing string can not set, and only trips out former tubing string and is lowered to new instrument again, influences the ordinary production in oil field.

Summary of the invention:

The purpose of this utility model provides and a kind ofly is applicable to that oil field separate stratum fracfturing, seperated layer water injection, layering are squeezed and blocks up, test cover, test a kind of down-hole switch sliding sleeve that leakage waits in the measure tubing string, overcome the defective that prior art pitching need not in place have repeated lower tubular column, reduce job execution and accounted for the product time, improved the job execution benefit.

The utility model is made up of top connection, central tube, packed-piston, pressure drop piston, spring, pressure regulation cap, top connection is threaded with central tube, on the inner tubal wall at central tube middle part is a step, the internal diameter of this step is less than the internal diameter of central tube upper end, the pressure drop piston outside is a variable-diameter structure, the top external diameter is big, lower outer diameter is little, be installed in by shear pin on the inwall on central tube top, the bottom of pressure drop piston and central tube middle bench form matched in clearance, are separately installed with sealing ring and sealing ring at the pressure drop piston upper/lower terminal; The bottom of central tube is equipped with the pressure regulation cap by screw thread, and is fixed by steady nail, is with packed-piston and spring on the central tube outer wall between pressure regulation cap and the top connection; On the central tube position corresponding, have the fluid hole that is connected with the annular space of central tube and pressure drop piston formation with packed-piston.

The beneficial effect that the utlity model has is: squeeze in oil field separate stratum fracfturing, seperated layer water injection, layering and block up, test cover, test and leakage wait in the measure construction, after tubing string puts in place, suppress by tubing string, oil jacket is communicated with, after measure is finished, stop to suppress, can cut off the oil jacket annular space, stop stratum liquid to enter in the tubing string, realize the stratum pressurize.

Description of drawings:

Accompanying drawing 1 is the utility model structural representation.

The specific embodiment:

Below in conjunction with accompanying drawing the utility model is described further:

By accompanying drawing 1 as can be known, the utility model is by top connection 1, central tube 2, packed-piston 5, pressure drop piston 7, spring 8, pressure regulation cap 10 is formed, top connection 1 is threaded with central tube 2, be a step on the inner tubal wall at central tube 2 middle parts, the internal diameter of this step is less than the internal diameter of central tube 2 upper ends, pressure drop piston 7 outsides are variable-diameter structure, the top external diameter is big, lower outer diameter is little, be installed in by shear pin 4 on the inwall on central tube 2 tops, the bottom of pressure drop piston 7 and central tube 2 middle benches form matched in clearance, on pressure drop piston 7, following two ends are separately installed with sealing ring 3 and sealing ring 9; The bottom of central tube 2 is equipped with pressure regulation cap 10 by screw thread, and is fixed by steady nail 11, is with packed-piston 5 and spring 8 on central tube 2 outer walls between pressure regulation cap 10 and the top connection 1; On the corresponding position of central tube 2 and packed-piston 5, have the fluid hole 6 that the annular space that forms with central tube 2 and pressure drop piston 7 is connected.

The utility model is connected in the tubing string, after tubing string is gone into the well and put in place, in tubing string, suppresses, pressure acts on the pressure drop piston 7, because pressure drop piston 7 top external diameters are big, lower outer diameter is little, form area difference, under differential pressure action, cutting off shear pin 4 moves down pressure drop piston 7, liquid affacts on the packed-piston 5 by fluid hole 6, and the elastic force that overcomes spring 8 makes packed-piston 5 descending, and oil jacket is communicated with, can clamp-on the liquid of various needs to the stratum, carry out various measure constructions; When stopping to suppress, packed-piston 5 resets under the elastic force effect of spring 8, cuts off the oil jacket annular space, stops stratum liquid to enter in the tubing string, realizes the stratum pressurize, improves efficiency of construction.

Claims

1, a kind of down-hole switch sliding sleeve, by top connection (1), central tube (2), packed-piston (5), pressure drop piston (7), spring (8), pressure regulation cap (10) is formed, top connection (1) is threaded with central tube (2), it is characterized in that on the inner tubal wall at central tube (2) middle part be a step, the internal diameter of this step is less than the internal diameter of central tube (2) upper end, pressure drop piston (7) outside is a variable-diameter structure, the top external diameter is big, lower outer diameter is little, be installed in by shear pin (4) on the inwall on central tube (2) top, the bottom of pressure drop piston (7) and central tube (2) middle bench form matched in clearance, on pressure drop piston (7), following two ends are separately installed with sealing ring (3) and sealing ring (9); The bottom of central tube (2) is equipped with pressure regulation cap (10) by screw thread, and fixing by steady nail (11), is with packed-piston (5) and spring (8) on central tube (2) outer wall between pressure regulation cap (10) and the top connection (1); On central tube (2) position corresponding, have the fluid hole (6) that is connected with the annular space of central tube (2) and pressure drop piston (7) formation with packed-piston (5).