CN201068781Y

CN201068781Y - Down-hole fixed pressure opening valve for injection, extraction and washing

Info

Publication number: CN201068781Y
Application number: CNU2007200187831U
Authority: CN
Inventors: 孙长喜; 卢宗平; 车登先; 王文胜
Original assignee: Downhole Operation Co of Shengli Petroleum Administration
Current assignee: Downhole Operation Co of Sinopec Shengli Oilfield Co
Priority date: 2007-02-14
Filing date: 2007-02-14
Publication date: 2008-06-04
Anticipated expiration: 2017-02-14

Abstract

The utility model relates to an underground injecting, picking and washing valve which can be opened at a certain pressure. The underground injecting, picking and washing valve comprises a fishing head, an overflow cap, a ball, a valve body, a plunger rod, a piston, a spring, a sealing plug, a holding press cap and an O-shaped sealing ring. The valve body is composed of two symmetrical plunger hydraulic cylinders, a unidirectional oil extraction channel, a squeeze and injection channel, a valve barrel and screw threads at both ends. The valve is a throw-in type injecting, picking and washing valve, and has the functional mode that the sealing plug is inserted into a seal cavity in a fish top of a well, liquid below the seal cavity can be picked through the valve, and the seal cavity is normal-opened from bottom to top and can be opened at a certain pressure from top to bottom, therefore, the liquid which cleans the well cannot flow below the seal cavity when in well cleanout at the space above the seal cavity; when the part under the seal cavity is required to be processed, the seal cavity can be opened under a designed pressure, therefore the liquid is squeezed and injected into the part under the seal cavity.

Description

The down-hole constant pressure turn on is annotated, is adopted, flushing valve

Technical field

The utility model discloses a kind of completion tool of oilfield oil well stratum protection, particularly a kind of down-hole constant pressure turn on is annotated, is adopted, flushing valve.

Background technology

At present, in the on-the-spot prior art of using, its ball seat is movable structure, move downward together behind the pressurized, the power of pressurized is to be produced by the difference of the suffered hydraulic pressure in cross section, space at hydraulic pressure on the ball seat and spring place, because the existence that need press down, thereby spring and the outside necessary UNICOM of valve body, like this particle object that produces of various factors, will sink to the residing space of spring, spring can't be compressed, cause valve not open.

Summary of the invention

The purpose of this utility model provides that a kind of down-hole constant pressure turn on is annotated, adopted, flushing valve, from the well head input, insert and seat on the instrument of downhole packer or other seal shaft.The purpose of this utility model is achieved in that this valve is made up of fishing head, overcurrent cap, ball, valve body, plunger rod, piston, spring, sealing plug, locking pressure cap and sealing O type circle.Valve body is that two plunger fluid cylinders of symmetry, unidirectional oil recovery passage, squeeze note passage, valve barrel and two ends screw thread are formed.Piston is made up of squeeze note tank, squeeze note hole, fluid sealant ring recess, balance pipe, guide and limit bar.Its duty is in the interior top of fish annular seal space of sealing plug fill-in well, the following liquid of annular seal space can be through the valve extraction, be normal open from bottom to top, be that level pressure is opened from top to bottom, therefore in the time of can realizing the above space of annular seal space well-flushing well-flushing liquid is sealed in below the annular seal space, and when needs are handled below to annular seal space, can under design pressure, open again, to the following squeeze note liquid of annular seal space.

The beneficial effects of the utility model are: the oil recovery passage is often opened when realizing ordinary production, and valve is in closed condition in the time of need carrying out operation such as well-flushing to sealing tool top, can avoid flushing fluid to the injury of sealing tool bottom oil reservoir like this, plays the effect of protection oil reservoir.And need handle sealing tool bottom oil reservoir the time, can under the pressure of setting, open by valve, make liquid carry out the bottom oil reservoir.

Description of drawings

Fig. 1 is the utility model assembling schematic diagram.

Fig. 2 is the utility model valve body 4 structural representations.

Fig. 3 is the utility model piston 6 structural representations.

1 be that fishing head, 2 is the guide and limit bar for balance pipe, 18 for fluid sealant ring recess, 17 for squeeze note hole, 16 for squeeze note tank, 15 for valve barrel, 14 for squeeze note passage, 13 for unidirectional oil recovery passage, 12 for plunger fluid cylinder, 11 for sealing plug, 10 for locking pressure cap, 9 for spring, 8 for valve body, 7 for valve plug, 6 for plunger rod, 5 for ball, 4 for overcurrent cap, 3 among the figure (1).

The specific embodiment

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing: at first the plunger rod 5 with two band cushion rubbers inserts the plunger fluid cylinder 10 of valve body 4 from the upper end of valve body 4, one end of plunger rod band cushion rubber is towards the upper end of valve body 4, and two ends flush with plunger fluid cylinder 10.Again with piston (6) band cushion rubber from the lower end of valve body 4 with guide and limit bar 18 downward put into valve body 4, again spring 7 is inserted in along guide and limit bar 18 lower ends, then with sealing plug 8 upper end screw threads and valve body 4 lower end screwed connections, more locking pressure cap 9 usefulness screw threads are connected with valve body 4 push down sealing plug 8 in case on release.Again ball 3 is put into valve body 4 from the upper end of valve body 4, overcurrent cap 2 is pushed down plunger rod 5 with valve body 4 screwed connections, and it can not be moved up.At

last fishing head

1 and 2 screwed connections of overcurrent cap are got final product.

During the site operation operation, earlier valve is dropped in the well from well head, in the interior top of fish annular seal space of sealing plug 8 fill-in wells.During well-flushing, 3 in ball can circulate liquid above the valve but below can not entering on unidirectional oil recovery passage 11.

In the time of need handling the bottom oil reservoir, when closing the sleeve pipe extruding, liquid enters from overcurrent cap 2, promotes two plunger rods 5 and moves down, and plunger rod 5 and then promotion piston move down, guide and limit bar 18 sealed plug 8 endoporus shoulders were spacing when piston compressed spring 7 to design pressure, align with squeeze note passage 12 in squeeze note tank 14, squeeze note hole 15 simultaneously, and fluid course is unimpeded, opening of valves, liquid enters the bottom oil reservoir through squeeze note passage 12, squeeze note tank 14, squeeze note hole 15, realizes the squeeze note operation.When stopping the squeeze note operation, pressure reduces, and spring 7 promotes piston stroking upwards, and then promotes to move on the plunger rod 5 and set back.

Normal oil recovery process, oil reservoir liquid backs down ball 3 through corresponding oil production equipment extraction through sealing plug 8 endoporus, piston inner hole, unidirectional oil recovery passage 11.

Claims

1. the down-hole constant pressure turn on is annotated, adopt, flushing valve, by fishing head (1), overcurrent cap (2), ball (3), plunger rod (4), valve plug (5), valve body (6), spring (7), locking pressure cap (8), sealing plug (9) is formed, it is characterized in that valve body (6) includes two plunger fluid cylinders (10) of symmetry, unidirectional oil recovery passage (11), squeeze note passage (12) and valve barrel (13), valve plug (5) includes squeeze note tank (14), squeeze note hole (15), fluid sealant ring recess (16), balance pipe (17), guide and limit bar (18) is formed, the plunger rod (4) of two band glue is inserted the plunger fluid cylinder (10) of valve body (6) from the upper end of valve body (6), one end of plunger rod (4) cushion rubber is towards the upper end of valve body (6), and two ends flush with the plunger fluid cylinder.

2. down-hole according to claim 1 constant pressure turn on is annotated, is adopted, flushing valve, it is characterized in that valve plug (5) is positioned at valve body (6), sealing plug (9) upper end screw thread and valve body (6) lower end screwed connection, and locking pressure cap (8) usefulness screw thread is connected with valve body (6).

3. down-hole according to claim 1 constant pressure turn on is annotated, is adopted, flushing valve, it is characterized in that ball (3) is positioned at valve body (6), and overcurrent cap (2) connects valve body (6), and fishing head (1) adopts screwed connection with overcurrent cap (2).