CN2517856Y - Extension compensator - Google Patents

Abstract

The utility model belongs to a down-hole tool for the oil field, in particular to a telescoping compensator. The utility model is provided with an outer coupling 1 which is connected with a central pipe 9 through a screw thread, a resistance prevention cover 2 and a piston 7 are arranged in ring cavities of an outer cylinder tube 8 and the central pipe 9, the resistance prevention cover 2 is connected with the cylinder tube 8 through the screw thread, the resistance prevention cover 2 is connected with the central pipe 9 through a prevention block 4, to form an anti-resistance mechanism, the tool is effective when being encountered the resistance, the piston 7 at the front part, the outer wall of the central pipe 9, and the inner wall of a sealing rubber tube 6 with the same body are sealed in two grades, the concave table at the middle part of the central pipe 9 and the inner wall of the cylinder tube 8 form the subsection sealed by a sealing ring 11 and a sealing rubber tube 12, the outer wall at the right end of the central pipe 9 and the inner wall of the cylinder tube 8 form the subsection sealed by a sealing ring 14 and a sealing rubber tube 15, therefore, the sealing is reliable, and the sealing cycle is prolonged. The unity model is suitable for pipe strings with the water well water filling process in the oil field.

Description

Telescopic compensator

Technical field the utility model belongs to the oil field downhole tool, particularly a kind of telescopic compensator.

Background technology is present, and the used telescopic compensator of underground water-injection tubing string adopts single seal with O ring structure both at home and abroad, and the sealing phase is short, easily loses efficacy; Nothing deters device, and inefficacy is hampered in the process of going into the well.

Summary of the invention the utility model purpose is to overcome above technical deficiency, provides a kind of twin-stage sealing, the telescopic compensator with anti-resistance function.

Task of the present utility model is, telescopic compensator has outer box cupling, deters cover, cylinder barrel, central tube, piston are formed, outer box cupling is threaded with central tube, deterring cover is threaded with the cylinder barrel left end, be loaded on the central tube outer wall, obstruction block is loaded on and deters in the grooving, and the piston inner left wall compresses obstruction block, the obstruction block bottom is flush-mounted in the central tube annular groove, and cylinder barrel is connected with central tube.Its operating principle: connect water injection packer under this instrument, on connect oil pipe, the precalculated position of going into the well, water filling is suppressed in oil pipe, and piston is started working, and fixture block loses support, central tube becomes two bodies that slide mutually with cylinder barrel, piston under hydraulic action, produce left pressure and oil pipe to the right pressure equate that cancel each other, telescopic compensator is in pressure balance with the lower part; Stop pressing the back oil pipe to shorten, central tube slides up in cylinder barrel, and cylinder barrel keeps motionless with lower tubular column under the equilibrant force effect.

The utility model characteristics: one, under the fluid pressure effect, piston to the right pressure balance in pressure and the oil pipe left, guarantee that the following tubing string of telescopic compensator is in the stress balance state, the above tubing string of telescopic compensator, flexible expansion loop is not exerted an influence with the lower part, improve the application life of packer by the relative slip compensation between central tube and cylinder sleeve; Its two, design twin-stage sealing, the reliable sealing cycle that prolongs of sealing; Its three, anti-resistance guarantees that telescopic compensator is hampered and did not lose efficacy.

Description of drawings specifies with example below in conjunction with accompanying drawing.

Fig. 1 shows the telescopic compensator structure chart.

Among the figure, the outer box cupling of 1-; 2-deters cover; The 3-shear pin; The 4-obstruction block; The 5-sealing ring; The 6-sealing drum; The 7-piston; The 8-cylinder barrel; The 9-central tube; Hole on the 10-central tube; The 11-sealing ring; The 12-sealing drum; Hole on the 13-cylinder barrel; The 14-sealing ring; The 15-sealing drum

The specific embodiment is with reference to accompanying drawing 1, telescopic compensator has outer box cupling 1, deter cover 2, shear pin 3, obstruction block 4, sealing ring 5, sealing drum 6, piston 7, cylinder barrel 8, central tube 9, outer box cupling 1 one that is threaded with central tube 9, deterring cover 2 is threaded to one and is loaded on central tube 9 outer walls with cylinder barrel 8, obstruction block 4 is loaded on and deters in cover 2 grooves, anti-resistor 2 bottom boss are flush-mounted in central tube 9 circumferential recess, the piston inner left wall is pressed on obstruction block 4 outer walls, formed anti-resistance device, sealing ring 5, sealing drum 6 is loaded in the piston seal groove, form the twin-stage sealing, piston 7 is loaded in the ring cavity that cylinder barrel 8 and central tube 9 form, and is fixed in by shear pin 3 and deters on the cover 2.

Operating principle: connect oil pipe on the telescopic compensator, under connect water injection packer, when water filling in the oil pipe is suppressed to certain pressure, piston 7 is cut off shear pin 3 left lateral under action of hydraulic force, peak at and deter cover 2 right sides, obstruction block 4 loses support, shift out in central tube 9 grooves, cylinder barrel 8 is fixedlyed connected elimination with central tube 9, relatively move, the pressure left that acts on the piston 7 equates to offset with the pressure to the right that central tube 9 interior hydraulic pressure produce, the bottom tubing string that cylinder barrel 8 connects is in the stress balance state, and after stopping pressing, the above tubing string of telescoping tube reclaims, central tube 9 moves up with respect to cylinder barrel 8, and cylinder barrel 8 connections is motionless with the lower tubular column maintenance.

Technical data: 1, operating pressure :≤30MPa

2, operating temperature :≤120 ℃

This instrument is applicable to the oil-field flooding process pipe string.

Claims (3)

1, a kind of telescopic compensator, having outer box cupling (1) is threaded with central tube (9), outer cylinder (8) deters cover (2) with interior installation of the ring cavity of central tube (9), piston (7), it is characterized in that deterring cover (2), cylinder barrel (8) is by being threaded, deterring cover (2) is connected by obstruction block (4) with central tube (9), anterior piston (7) and central tube (9) outer wall, cylinder barrel (8) inwall is by sealing ring (5), the sealing of cartridge (6) consubstantiality twin-stage, central tube (9) middle part boss and cylinder barrel (8) inwall are by sealing ring (11), cartridge (12), central tube (9) right-hand member outer wall and cylinder barrel (8) inwall are by sealing ring (14), cartridge (15) constitutes segmented seal, oil through (10) on the central tube (9) communicates with tubing string, and cylinder barrel (8) is provided with through hole (13).

2,, it is characterized in that cylinder barrel (8) is connected by obstruction block (4) with central tube (9) according to the described telescopic compensator of claim 1.

3, according to the described telescopic compensator of claim 1, it is characterized in that sealing ring (5), cartridge (6) that piston (7) is upward installed, sealing ring (11), cartridge (12) that central tube (9) is installed, the sealing ring (14) that cylinder barrel (8) is installed, cartridge (15) constitute the two section sealings of twin-stage.

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