CN2893131Y

CN2893131Y - Sand flushing packer

Info

Publication number: CN2893131Y
Application number: CN 200520145311
Authority: CN
Inventors: 董家斌; 任国亮; 白长琦; 马荣华; 陈义发
Original assignee: Sinopec Henan Oilfield Branch Co No 2 Oil Production Plant
Current assignee: Sinopec Henan Oilfield Branch Co No 2 Oil Production Plant
Priority date: 2005-12-23
Filing date: 2005-12-23
Publication date: 2007-04-25
Anticipated expiration: 2015-12-23

Abstract

The utility model relates to a sand washing excluder, which belongs to the field of oil field exploitation. The utility model is mainly composed of internal and external sand washing pipes, upper and lower central tubes, transition joints and elevating pipe nipples. The upper end of the internal sand washing pipe is externally connected with the transition joint, while the lower end is threaded through the central tube; the upper end of the transition joint is internally connected with the elevating pipe nipple, while the lower end is externally connected with the upper central tube by coupling; and the lower end of the upper central tube is externally connected with the external sand washing pipe, while the lower end of the external sand washing pipe is externally connected with the lower central tube; the exterior parts of the upper and lower central tubes are respectively connected with a rubber cup base and an upper and a lower rubber cups, while the bell mouth of the upper rubber cup is opened upward and the bell mouth of the lower rubber cup is opened downward; the tube walls of the upper and lower central tubes are respectively provided with a liquid outlet. The technic proposal can block off the leakage zone under the well when the sand washing is carried on to prevent the sand washing liquid and sand deposited in the well shaft from flowing into the stratum so that the sand washing liquid and sand can return to the ground; to prevent the sand in the sand washing construction well from fleeing into the adjacent corresponding well from the vapor fleeing channel; and the utility model can move up and down along the inner wall of the bushing when the sand is washed. The utility model also has the advantages of the simple structure, the easy connection and the simple operation.

Description

A kind of sand washing packer

One, technical field

The utility model relates to the oil field development field, particularly a kind of special-purpose downhole tool of absorption well sand flushing operation.

Two, background technology

Existing sand washing tubing string is to use plain tubing, the fluid power sand washing, have the following disadvantages in the low-pressure absorption well sand flushing operation: 1, sand cleaning fluid can not return well head, sand in the pit shaft can not be carried into ground by sand cleaning fluid but enter the stratum and form quicksand, open and pass back into pit shaft when taking out again, be easy to holddown.2, when the sand washing of stratum deficit well section, a large amount of sand cleaning fluids enter the stratum, open after the operation when taking out, and increase the oil well drainage period; When annotating vapour after the operation, formation water has reduced the thermal efficiency of steam in jection.3,, easily cause corresponding vapour to scurry well rod string sand card for scurrying logical oil well mutually.4, can only be fixed on a certain position of internal surface of sleeve pipe after the packer set of the prior art, can not move.

Three, summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, designs a kind ofly can shutoff oil jacket annular space can move the sand washing packer at bearing certain pressure lower edge internal surface of sleeve pipe simultaneously.

For achieving the above object, the technical scheme taked of the utility model is:

A kind of sand washing packer mainly is made up of interior sand clean out pipe, outer sand clean out pipe, lower center tube, upper center tube, transit joint, lifting sub, and described interior sand clean out pipe upper end is external with transit joint, and lower center tube is passed in the lower end; Described transit joint connects lifting sub in the upper end, and the lower end joins by external upper center tube box cupling and upper center tube, the external outer sand clean out pipe in upper center tube lower end, the external lower center tube in outer sand clean out pipe lower end; The upper center tube middle and lower part is circumscribed with leather cup seat and last leather cup, and the horn mouth of last leather cup up, and the lower center tube middle and upper part is circumscribed with down cup seat and down cup, and the horn mouth of down cup down; Have liquid outlet on the tube wall of upper center tube middle part, have liquid outlet on the tube wall of lower center tube bottom.

The sand clean out pipe lower surface can be not perpendicular with its axis in described.

According to the height of sand post in the thickness of plugged zone and the pit shaft, described in sand clean out pipe length can regulate arbitrarily by the quantity that screw thread increase and decrease between its pipe connects pipe, outer sand clean out pipe also can be regulated arbitrarily by the quantity of screw thread increase and decrease pipe between its pipe.

Adopt the technical solution of the utility model, can miss interval under the plugged well when the sand washing operation, prevent that the sand flow of sand cleaning fluid and pit shaft deposition from going into the stratum, sand cleaning fluid and sand can return to ground; The sand that prevents sand washing construction well is scurried passage from vapour and is scurried into adjacent corresponding well; The utility model can move up and down along internal surface of sleeve pipe when the sand washing operation.The utility model is simple in structure, easy to connect, execute-in-place is simple.

Four, description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is a work schematic diagram of the present utility model.

Five, the specific embodiment

Referring to Fig. 1, the utility model mainly is made up of interior sand clean out pipe 7, outer sand clean out pipe 6, lower center tube 2, upper center tube 8, transit joint 13, lifting sub 14, and described interior sand clean out pipe 7 upper ends and transit joint 13 are external, and lower center tube 2 is passed in the lower end; Described transit joint connects lifting sub 14 in 13 upper ends, and the lower end joins the external outer sand clean out pipe 6 in upper center tube 8 lower ends, the external lower center tube 2 in outer sand clean out pipe 6 lower ends by external upper center tube box cupling 12 with upper center tube 8; Upper center tube 8 middle and lower parts are circumscribed with leather cup seat 9 and last leather cup 10, and the horn mouth of last leather cup 10 up, and lower center tube 2 middle and upper parts are circumscribed with down cup seat 5 and down cup 4, and the horn mouth of down cup 4 down; Have liquid outlet 11 on the upper center tube 8 middle part tube walls, have liquid outlet 3 on the lower center tube 2 bottom tube walls.Sand clean out pipe 7 lower surfaces 1 can be not perpendicular with its axis in described.

Referring to Fig. 2, in the time of in connecting good sand washing tubing string lower going-into-well, last down

cup

10 and 4 shutoff lost-circulation zones 21, the utility model forms the sand washing process passage at pit shaft.During square impact, sand cleaning fluid enters interior sand clean out pipe 7 from the well head oil pipe, and enters pit shaft with sand setting 20 impact suspensions from its lower end 1, and load fluid enters by inside and outside sand clean out pipe 7 and 6 sandwich passage of forming 22 through liquid outlet 3, come out from liquid outlet 11, return out ground through the annular space 23 of oil pipe and sleeve pipe; During recoil sand, sand cleaning fluid enters from the annular space 23 of oil pipe and sleeve pipe, enter by inside and outside sand clean out pipe 7 and 6 sandwich passage of forming 23 through liquid outlet 11, come out from liquid outlet 3, pit shaft sand setting 20 is impacted suspension to get up, load fluid enters from interior sand clean out pipe 7 lower ends 1, returns out ground through interior sand clean out pipe 7 from oil pipe.

Connect manifold of ground and begin sand washing, wash down and put tubing string,, treat that clean sand cleaning fluid circulated after a week, stop sand washing, trip out the sand washing process tubing string until the shaft bottom sand is all gone out pit shaft.

Claims

1, a kind of sand washing packer mainly is made up of interior sand clean out pipe (7), outer sand clean out pipe (6), lower center tube (2), upper center tube (8), transit joint (13), lifting sub (14), it is characterized in that:

A, described interior sand clean out pipe (7) upper end and transit joint (13) are external, and lower center tube (2) is passed in the lower end;

B, described transit joint (13) connect lifting sub (14) in the upper end, and the lower end joins the external outer sand clean out pipe in upper center tube (8) lower end (6), the external lower center tube in outer sand clean out pipe (6) lower end (2) by external upper center tube box cupling (12) and upper center tube (8);

C, upper center tube (8). the middle and lower part is circumscribed with leather cup seat (9) and last leather cup (10), and the horn mouth of last leather cup (10) is up, and lower center tube (2) middle and upper part is circumscribed with down cup seat (5) and down cup (4), and the horn mouth of down cup (4) is down;

Have liquid outlet (11) on D, upper center tube (8) the middle part tube wall, have liquid outlet (3) on the tube wall of lower center tube (2) bottom.

2, sand washing packer according to claim 1 is characterized in that: sand clean out pipe (7) lower surface (1) is not perpendicular with its axis in described.