CN2674081Y

CN2674081Y - Sand controlled well flushing valve

Info

Publication number: CN2674081Y
Application number: CN 200420018421
Authority: CN
Inventors: 陈香海
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-02-08
Filing date: 2004-02-08
Publication date: 2005-01-26
Anticipated expiration: 2014-02-08

Abstract

The utility model relates to a sand controlled well flushing valve, comprising a bypass check valve, a baffle ball check valve and a well sieve-tube in turn through connection. The bypass check valve comprises a joint, a protective cover, a return spring, an inner cylinder, a piston, a sand controlled rubber bowl, a baffle ring and an outer cylinder. A radial hole is opened on the inner cylinder. The sand controlled rubber bowl whose upper end is connected with the joint is arranged at the bottom of the inner cylinder and is fixed with the baffle ring. The baffle ring is perforated axially and uniformly. One end of the piston is connected with the return spring, and the piston together with the return spring are installed on the outside of the inner cylinder. One end of the outer cylinder is connected with the ball seat of the baffle ball, and the other end of the outer cylinder is connected with a water-filling tail pipe via the joint. The bypass check valve is added to the sand controlled well flushing valve on the base of the original baffle ball structure with no loss of functionality of the pipe column. The inner cylinder is provided with the sand controlled rubber bowl, preventing the baffle ball contacting with the silt settling and the impurities in the well. Thus the phenomena which thebaffle ball is stacked and buried and the ball seat of the baffle ball is dead pressed can not happen. When the well is backflushed, the baffle ball can be opened so that the well can be flushed successfully, solving the problems that the well flushing can not be done, the well is obstructed and the testing instrument is blocked.

Description

The sand prevention flushing valve

Technical field:

The utility model relates to the sand prevention flushing valve of separate water injection well tubing string afterbody.

Background technology:

Water injection well in oil fields in water filling or test process, tester be hampered at final stage injection well downhole flow regulator place or well-flushing obstructed be the main cause of oil field well reprovision, account for 25% of reprovision well sum, the operating cost that year takes place nearly ten million surplus yuan.

The main cause that produces this situation is a tubing string bottom desilting, and when tubing string bottom sediment accumulation of thick, the shelves ball heap that the oil pipe afterbody is placed buries, and the shelves ball seat is killed, during well-flushing, and the stone-dead work of shelves, switch is not opened, can't well-flushing; Injection well testing, tester is obstructed.Under the normal condition, during the water anti-flushing well, wash a grade ball open, the silt in the flush away tubing string, on the shelves ball by hydraulic pressure.Because the stone-dead work of shelves can't well-flushing, its unique treating method is exactly to go up operation, increases operating cost, and promptly influencing the water filling quality increases operation cost again, therefore is necessary to develop a kind of effective sand prevention flushing valve, to reduce operation.Ground experiment shows: under the situation of the stone-dead work of shelves, 2 meters dust devils just can cause well-flushing obstructed, and the sand post still can be removed dust devil by the mode of well-flushing above 9 meters under the situation of shelves ball action.

Summary of the invention:

Goal of the invention of the present utility model is to provide a kind of water injection well special-purpose sand prevention flushing valve at the problems referred to above.

The utility model is achieved in that the sand prevention flushing valve increases a bypass ball-and-seat on former water injection well shelves ball design basis, and the bypass ball-and-seat is made up of joint, protective cover, back-moving spring, inner core, piston, sand prevention glue bowl, shelves ring, urceolus; The inner core radial aperture, sand prevention glue bowl is contained in interior tube bottom, fixes with the shelves ring, and the upper end connecting joint is used to prevent that desilting, impurity from directly contacting and being deposited in a grade ball with the shelves ball; Piston will constitute enclosure space between shelves ball, inner core, the urceolus, and moves along inner tank theca, opens or the enclosed radical hole; Urceolus one end connects the water filling tail pipe by joint, and the other end connects shelves ball ball seat.

Because interior tube bottom is equipped with sand prevention glue bowl, the silt of deposition is deposited in earlier on the sand prevention glue bowl, form dust devil at inner core, too much when sand prevention glue bowl deposition, when needing anti-flushing well, open a grade ball ball-and-seat earlier by hydraulic pressure, the shelves ball is backed down, enter the enclosure space between shelves ball, inner core, the urceolus, the water pressure pushing piston exposes the radial hole on the inner core.Owing on the inner core a plurality of radial holes are arranged, form a plurality of well-flushing passages, water enters from the inner core radial hole, and the desilting on inner barrel of washing top, the sand prevention glue bowl perhaps carries out injection well testing.

The sand prevention flushing valve is mainly used in the separated-zone water infection oil field well, is installed in the tubing string bottom, goes into the well with tubing string when the well job execution.

The utlity model has following beneficial effect:

The sand prevention flushing valve has increased the bypass ball-and-seat on former shelves spherical structure basis, because the inner core of bypass ball-and-seat is equipped with sand prevention glue bowl, does not influence the tubing string function, and the shelves ball does not contact with desilting, impurity in the well, a grade ball can not take place to be buried by heap, and the phenomenon that the shelves ball seat is killed; During anti-flushing well, can smooth opening shelves ball, well-flushing smoothly, when thoroughly solving anti-flushing well, the stone-dead work of shelves, a shelves ball valve is not opened, can't well-flushing and well is obstructed, tester is obstructed can't be tested problem.

Description of drawings:

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1 joint, 2 protective covers, 3 back-moving springs, 4 inner cores, 5 pistons, 6 sand prevention glue bowls, 7 baffle rings, 8 are blocked, 9 urceolus, 10 sealing rings, 11 are blocked ball seat, 12 screen casings, 13 radial holes.

The specific embodiment:

According to structure shown in Figure 1, as shown in the figure, the sand prevention flushing valve is connected to form successively by bypass ball-and-seat, shelves ball ball-and-seat, screen casing three parts.The bypass ball-and-seat is made up of joint 1, protective cover 2, back-moving spring 3, inner core 4, piston 5, sand prevention glue bowl 6, shelves ring 7, urceolus 9.Inner core 4 is radially opened 2-6 hole 13, and sand prevention glue bowl 6 is installed in the bottom of inner core 4, and fixing with baffle ring 7, the upper end of inner core 4 connects protective cover 2, and protective cover 2 is threaded with joint 1.Axially evenly perforate on the baffle ring 7, one end of piston 5 connects back-moving spring 3, piston 5 constitutes enclosure space between inner core 4 outsides are with shelves ball 8, inner core 4, urceolus 9, piston 5 moves along inner core 4 outer walls under the effect of hydraulic pressure, back-moving spring, opens or enclosed radical hole 13.The upper end of urceolus 9 connects the water filling tail pipe by joint 1, the lower end of urceolus 9 ball seat 11 of blocking that is threaded.

Claims

1, a kind of sand prevention flushing valve is characterized in that: the sand prevention flushing valve is connected to form successively by bypass ball-and-seat, shelves ball ball-and-seat, screen casing three parts; Described bypass ball-and-seat is made up of joint (1), protective cover (2), back-moving spring (3), inner core (4), piston (5), sand prevention glue bowl (6), shelves rings (7), urceolus (9); Inner core (4) is opened radial hole (13), sand prevention glue bowl (6) is contained in inner core (4) bottom, be fixed on the shelves rings (7), inner core (4) upper end connecting joint (1), shelves rings (7) axial aperture, piston (5) one ends connect back-moving spring (3), and piston (5) is installed in the outside of inner core (4) with back-moving spring (3), urceolus (9) one ends connect shelves ball ball seat (11), and the other end connects the water filling tail pipe by joint (1).