CN200985755Y

CN200985755Y - Continuance bounce-back sand-flushing device

Info

Publication number: CN200985755Y
Application number: CN 200620168537
Authority: CN
Inventors: 孙成威; 刘雪峰
Original assignee: Liaohe Petroleum Exploration Bureau
Current assignee: Liaohe Petroleum Exploration Bureau
Priority date: 2006-12-18
Filing date: 2006-12-18
Publication date: 2007-12-05
Anticipated expiration: 2016-12-18

Abstract

The utility model relates to a sand scouring device used in oil wells, in particular to a horizontal well continuous sand scouring device comprising a sliding sleeve connected with a reversing short section through a screw thread and an oil pipe coupling. The casing pipe is provided with a central tube, outside of which is a spring with the upper end attaching to the sliding sleeve outside of the central tube with the lower end milling four axially side slot bore in the tube wall. When the device returns to carry on well washing, the sand cleaning fluid can carry on sand scouring to avoid sand plug effectively in the case of stopping pump and can carry on the operation of connecting the oil tube, which solve the problem of drill pipe sticking caused by sand precipitation when the horizontal well carries on sand scouring and changes oil pipe. The utility model is simple in structure, convenient for construction and can be widely used in the continuous sand-washing for the horizontal well.

Description

A kind of horizontal well sand device that recoils continuously

Technical field:

The utility model relates to a kind of oil well sand washing device, especially a kind of horizontal well sand device that recoils continuously.

Background technology:

Sand production can influence oil well output, cause oil well to destroy, traditional sand washing method is to use cementing truck to inject a large amount of liquid in the OIH pipe, sand between oil pipe and sleeve pipe is gone out ground from annular space, described this direct circulation sand washing is limited by its cementing truck discharge capacity, and water supply volume is bigger, material liquid is under-supply, make the profit prop-carrying capacity poor, cause the sand card easily, and influence sand washing speed, as adopting the method for recoil, promptly water liquid enters oil well from oil casing annular space, sand, grain is gone out from oil pipe again, this method can be with the sand of the flat section of well in the oil well, grain fully stirs and discharges well head with sand cleaning fluid, though the method can improve to some extent to the sand setting developing result because net horizontal section sand fallout distance is shorter, particularly when inserting single oil pipe operation, need termination of pumping, easily make the sand setting grain, have an opportunity to cause sand card tubing string phenomenon equally in this section deposition.

The utility model content:

The utility model purpose is in order to overcome above-mentioned shortcoming, and a kind of horizontal well that the provides sand device that recoils continuously, and this device can utilize the anti-flushing well mode by the net horizontal section in oil well, needs can implement continuous sand flushing to oil well under the termination of pumping situation inserting oil pipe.

Technical scheme:

For reaching above-mentioned target, the utility model comprises by the commutation pipe nipple and forming by the sliding sleeve and the tubing coupling of screwed connection; One central tube is arranged in sleeve pipe, and central tube has a spring outward, and paste mutually with the sliding sleeve of central tube outside the spring upper end, is milled with four axial side slotted eyes on the lower end position tube wall of central tube.

In the described central tube ball-and-seat is housed.

When the utility model used, sand cleaning fluid was entered in the well by oil sets annular space by well head big four position, oil well ground, is discharged by oil pipe.When oil pipe is gone in the needs changing-over, when the elevator that hangs the commutation pipe nipple is seated to pithead position, the tubing coupling step that is positioned at the central tube lower end is blocked by the stripper rubber of well head, its clamping force is greater than the yield pressure of spring, make sliding sleeve descending, axial side slotted eye on the central tube outer wall is exposed, the steel ball that sliding sleeve drives in the interior ball-and-seat of central tube is up, the oil pipe passage is sealed, at this moment, sand cleaning fluid can't be discharged from the oil pipe center, changes from oil pipe side channel orifice flow, and sand setting liquid enters into space between two blocks of interior rubber of sealing well head, flow out through the well head side opening again, under not termination of pumping effect, can connect the pipe of changing oil like this, can realize continuous sand flushing again, not sand setting of the well section that is up to the standard, the purpose of sand card not.

The utility model compared with prior art has distinguishing feature:

Owing to connect a central tube in the commutation pipe nipple of the present utility model and on center tube wall, be milled with the side channel hole, the central tube skin has a sliding sleeve and ball-and-seat, when connecing the operation of oil pipe anti-flushing well, when hanging the commutation pipe nipple by the elevator seat to the sealing well head the time, slide on the sliding sleeve side channel hole on the center tube wall is exposed, at this moment, ball-and-seat in the central tube can block the oil pipe inner chamber again, the interior sand cleaning fluid of well can't be discharged from oil pipe, change to flow out and enter the well head side opening, flow out ground, at this moment by the central tube side channel, still can realize not termination of pumping continuous sand flushing on ground, thereby reach in the well not sand setting by the inverse circular sand washing adapter mode, sand plug not, the purpose of sand card not.

Description of drawings:

Figure is the utility model structural representation.

Among the figure by commutation pipe nipple 1,, 2, sleeve pipe, 3, central tube, 4, tubing coupling 5, spring, 6, ball-and-seat, 7, the side channel hole, 8, sliding sleeve, 9, stripper rubber, 10, the well head side opening, 11, the tubing coupling step, 12, well head, 13, the oil well big four forms.

The specific embodiment:

The utility model is provided by following examples, is illustrated below in conjunction with accompanying drawing.

Among the figure, commutation pipe nipple 1 be one at common 2  " a pipe nipple by screwed connection between the oil pipe; when the changing-over oil pipe, when the elevator of this pipe nipple is seated on the special-purpose well head; being arranged on inner ball valve will close automatically; like this, and load fluid continues when connecing oil pipe by flowing out in the side channel hole 7; the tubing string time-out is descending, and the circulation that load fluid does not still stop has realized the reverse continuous sand flushing of not termination of pumping because of the side channel duct on its central tube 3 walls is opened.This pipe nipple uses the seamless steel pipe material to make, and it comprises by sleeve pipe 2, central tube 3, spring 5, ball-and-seat 6, sliding sleeve 8, well head side opening 10 and forming.

Sleeve pipe 2 two ends have screw thread 2  " oil pipe; be connected to the upper and lower position of tubing coupling; a tubing coupling step 11 is arranged; the effect of this step is to block commutation pipe nipple 1 with elevator when removing oil pipe; its commutation pipe nipple is seated in stripper rubber 9 endoporus of well head 12, so that the sand washing circulation is carried out in termination of pumping when removing oil pipe in its sleeve pipe 2 lower ends.A central tube 3 is set in sleeve pipe 2, the central tube outer wall is with a compressible spring 5, central tube is a common metal pipe, on tube wall, be milled with four road axial side slotted eyes 7, the angle of the center line of per pass groove is 90 degree, evenly cloth is around center tube wall, outer suit one sliding sleeve 8 in spring 5 central upper portion pipe positions, between this sliding sleeve and the central tube for being slidingly matched, the rubber sealed sides slotted eye 7 that sliding sleeve inside is provided with the nitrile rubber making plays the leakproof effect, the sliding sleeve bottom tightly is adjacent to the upper surface at spring 5, sliding sleeve links to each other with steel ball in the central tube by side channel hole 7, and steel ball can move with sliding sleeve 8, on the tube wall of described central tube 3 inside a ball-and-seat 6 is housed, valve body relies on the lifting of steel ball, can close (figure does not draw) to ball-and-seat 6.Because when adopting said structure can realize recoiling the sand operation, sand cleaning fluid enters sand setting in the well by oil well big four 3 oil jacket annular spaces, by discharging in the oil pipe areole, when changing oil pipe, when suspension commutator pipe nipple elevator is on sealing well head 12, tubing coupling step 11 is blocked by well head stripper rubber 10, and this rubber is two nitrile rubbers, the middle porose position above the well head 12 that is fixed to.Be used for tightening tubing coupling step 11, make sliding sleeve descending, come out in side channel hole 7 on central tube 3 sidewalls, and be about to one way valve on the drive steel ball and block, at this moment sand cleaning fluid can't be discharged from oil pipe, changes by side channel hole 7 to flow out, enter the space between well head 12 interior two blocks of stripper rubbers 9, then, flow out, thereby realize not termination of pumping of horizontal well continuous sand flushing purpose by well head side opening 10.

Claims

1, a kind of horizontal well sand device that recoils continuously, comprise by commutation pipe nipple (1) and forming by the sleeve pipe (2) and the tubing coupling (4) of screwed connection, it is characterized in that: a central tube (3) is arranged in sleeve pipe (2), one spring (5) is arranged outside the central tube (3), paste mutually with the sliding sleeve (8) of central tube (3) outside spring (5) upper end, is milled with four axial side slotted eyes (7) on the lower end position tube wall of central tube.

2, a kind of horizontal well according to claim 1 sand device that recoils continuously is characterized in that: ball-and-seat (6) is housed in the described central tube (3).