CN201180523Y

CN201180523Y - System used for oil well sand pumping

Info

Publication number: CN201180523Y
Application number: CNU2008200799048U
Authority: CN
Inventors: 曲洪坤; 陈蔚鸿; 张永华
Original assignee: Anton Oilfield Services Group Ltd
Current assignee: Anton Oilfield Services Group Ltd
Priority date: 2008-04-11
Filing date: 2008-04-11
Publication date: 2009-01-14
Anticipated expiration: 2018-04-11

Abstract

The utility model relates to the petroleum machinery technical field, in particular to a system for oil well bailing. In order to solve the leak tightness problem of a ball-and-seat in the prior bailing process, the friction problem of the pump body of a sand bucket and a sleeve and a collar and the cleaning problem of the residual sand on the inner wall of the sleeve, the utility model provides a system for oil well bailing. The pump body from the turn of the sand bucket to the other end of a horizontal section is provided with a liquid discharge hole, a piston rod, an upper valve, a piston barrel, a hard piston, a soft piston, a sand settling pipe and a sand cutting and sand pushing tool in turn; a sand stopping nipple is arranged between the piston barrel and the sand settling pipe; a centralizer is arranged on the pump body in the horizontal section; and the tail end of the horizontal section of the sand bucket is provided with a bottom valve and a sand shovel. The system has the advantages that the system has good leak tightness, small friction of the sand bucket and the sleeve and the collar and long service life, and effectively guarantees that a large quantity of sand grains can not enter the piston barrel, the sand pumping capacity of the piston is strong and the work efficiency is high.

Description

A kind ofly be used for the system that oil well drags for sand

Technical field

The utility model relates to the petroleum machinery technical field, is specifically related to a kind of system that oil well drags for sand that is used for.

Background technology

In the Oilfield developing process, because loose sand formation cementation intensity is low or the influence of pressing crack construction, sand grains can flow into pit shaft along with formation fluid, causes pit shaft obstruction, down-hole string, instrument and ground installation wearing and tearing aggravation, and causes the oil well reduce or stop production.Generally speaking, adopt water circulation to carry method, the long-pending sand of pit shaft is broken up and take ground to by swiftly flowing liquid.Because the requirement of compatibility, density and the viscosity on sand cleaning fluid and stratum, this sand washing mode very easily cause formation contaminant and ground environment to pollute; For the bigger oil well of formation leakage amount, the hydraulic sand washing mode has certain degree of difficulty, can not finish the sand washing operation sometimes, and the job execution cycle is long, and down-hole accident easily takes place, and the work operations amount is bigger, the cost height.Conventional sand washing process is difficult for going out sand grains, and oil reservoir is polluted; And mechanical sand bucket is according to the operating principle of oil well pump, its power is working rig, the oil pipe on sand bucket top is as the line shaft of plunger, the bottom sand sediment pipe is as storage sand pocket, according to the height of sand post, the length of decision storage sand oil pipe, handling oil pipe up and down, directly sand is extracted in the storage sand oil pipe, finishes and drag for the sand operation.When strata pressure is low, oil reservoir is missed when serious, and this technology has bigger advantage.The restriction on the design feature but machinery drags for sand technology, the present range of application of this technology only is confined to Vertical Well, can't directly use horizontal well.

Summary of the invention

In order to solve the existing sealing problem that drags for ball-and-seat in the sand technology, friction problem between the pump housing of sand bucket and sleeve pipe and the box cupling, cleaning problem attached to the residual sand on the internal surface of sleeve pipe, and in taking out the sand process, sand liquid stops up the problem of sand pump and last valve, and the utility model provides a kind of system that oil well drags for sand that is used for, and has improved the efficient of dragging for sand, and desanding is thorough, not polluted reservoir.

In order to achieve the above object, the technical solution adopted in the utility model is: a kind ofly be used for the system that oil well drags for sand,, in the other end pump housing of horizontal segment, be provided with outage, piston rod successively, go up valve, piston cylinder, hard piston, soft piston, sand sediment pipe, broken sand push away the sand instrument from the turning of sand bucket; Be provided with the sand block short circuit between described piston cylinder and the sand sediment pipe, on the horizontal segment pump housing, be provided with the instrument of setting upright; The end of described sand bucket horizontal segment is provided with bottom valve and sand shovel, and bottom valve and sand shovel are collectively referred to as horizontal sand shovel.

Above-mentioned upward valve and bottom valve are the ball-and-seat that resets that leads, and the described valve interior wall upper edge valve body of going up valve and bottom valve is axially arranged with three grooves, play guiding and reset.

Bead in the above-mentioned bottom valve is the bakelite ball.

The above-mentioned instrument of setting upright is rubber centralizer or rolling wheel centralizer.

Compared with prior art, the beneficial effects of the utility model are:

The utility model good airproof performance, the friction between sand bucket and sleeve pipe and the box cupling is few, and long service life effectively guarantees can not enter a large amount of sand grains in the piston cylinder, and the sand ability of taking out of piston is strong, high efficiency.

Description of drawings

Fig. 1 is the utility model overall structure schematic diagram;

Fig. 2 is the structural representation of horizontal sand shovel in the utility model;

Fig. 3 is the cross-sectional view of the utility model bottom valve valve body.

Reference numeral:

The 1-outage, the 2-piston cylinder, the 3-piston rod, the last valve of 4-, the hard piston of 5-, the soft piston of 6-, the 7-sand sediment pipe, 8-sand block short circuit, the broken sand of 9-pushes away the sand instrument, and 10-sets upright instrument, 11-bottom valve, 12-sand shovel, 13-groove, 14-bead, 15-power oil pipe.

The specific embodiment

Below in conjunction with accompanying drawing, structure of the present utility model is done detailed description.

Referring to Fig. 1, the utility model provides a kind of oil well level to drag for the sand system, from the turning of sand bucket in the other end pump housing of horizontal segment, be provided with outage 1, piston rod 3 successively, go up valve 4, piston cylinder 2, hard piston 5, soft piston 6, sand sediment pipe 7, broken sand push away sand instrument 9, broken sand pushes away sand instrument 9 and the sand grains on the internal surface of sleeve pipe can be scraped off, and simultaneously transfers in the process residual sand shifted onto at the pipe string and inhales the sand mouth. Be provided with sand block short circuit 8 between described piston cylinder 2 and the sand sediment pipe 7, the well liquid that comes in the pumping is filtered, can guarantee can not enter a large amount of sand grains in the piston cylinder 2; On the horizontal segment pump housing, be provided with the instrument of setting upright 10, set upright instrument 10 can reduce sand bucket last put put in and friction between sleeve pipe and the box cupling, increase the service life, the described instrument 10 of setting upright is rubber centralizer or rolling wheel centralizer; The end of described sand bucket horizontal segment is provided with bottom valve 11 and sand shovel 12, and bottom valve 11 and sand shovel 12 are collectively referred to as horizontal sand shovel.

Referring to Fig. 2 and Fig. 3, last valve and bottom valve are the ball-and-seat that resets that leads in the utility model, valve interior wall upper edge valve body is axially arranged with three grooves 13, under the situation of dependable flow, playing guiding resets, bead 14 in the bottom valve is the bakelite ball, can realize normal unlatching and reset good airproof performance.

The step of using the utility model to drag for sand is:

(1) be lowered in the process at pipe string, the broken sand of sand bucket front end pushes away the sand instrument and clears up remaining on the casing wall residual sand, and pushes it to and inhale the sand mouth, horizontal sand shovel contact sand face, and the weight of horizontal segment is supported by centralizer;

(2) when carrying power oil pipe on the tractor hoist, drive piston rod, soft piston and hard piston and rise, at this moment go up valve and close, bottom valve is opened, and carries sand and enter sand sediment pipe, and sand in the sand sediment pipe and well liquid are up because sand proportion is bigger, constantly sink, well liquid rises;

(3) with step (2) simultaneously, the well liquid that the sand block short circuit filter to rise makes sand can only be deposited in the sand sediment pipe;

(4) when tractor hoist is transferred power oil pipe, drive piston rod, soft piston and hard piston and descend, at this moment to go up valve and open, bottom valve cuts out, and sand can not be got back in the sleeve pipe, and the top well liquid that does not contain sand, valve and circulation port are got back to the oil jacket annular space again on the process;

(5) put operation through putting on repeatedly, can realize sand is dragged for into sand sediment pipe, take pit shaft out of by oil pipe.

Claims

1, a kind ofly is used for the system that oil well drags for sand, it is characterized in that: in the other end pump housing of horizontal segment, be provided with outage, piston rod successively, go up valve, piston cylinder, hard piston, soft piston, sand sediment pipe, broken sand push away the sand instrument from the turning of sand bucket; Be provided with the sand block short circuit between described piston cylinder and the sand sediment pipe, on the horizontal segment pump housing, be provided with the instrument of setting upright; The end of described sand bucket horizontal segment is provided with bottom valve and sand shovel, and bottom valve and sand shovel are collectively referred to as horizontal sand shovel.

2, a kind of system that oil well drags for sand that is used for according to claim 1 is characterized in that: described upward valve and bottom valve are the ball-and-seat that resets that leads, and the described valve interior wall upper edge valve body of going up valve and bottom valve is axially arranged with three grooves.

3, a kind of system that oil well drags for sand that is used for according to claim 1 and 2 is characterized in that: the bead in the described bottom valve is the bakelite ball.

4, a kind of system that oil well drags for sand that is used for according to claim 1 is characterized in that: the described instrument of setting upright is rubber centralizer or rolling wheel centralizer.