CN202249850U - Sand washing and bailing device of absorption well - Google Patents

Abstract

The utility model relates to the technical field of oil exploitation, in particular to a sand washing and bailing device of an absorption well. In the device, a sand washing pipe column is in threaded connection with an swabbing packer, a pressure cover is welded with the swabbing packer, the swabbing packer is in threaded connection with an inner sand washing and bailing pipe column, the inner sand washing and bailing pipe column is arranged in a limitation connecting hoop, a back-flushing pipe, a back-flushing packer and an outer sand washing and bailing pipe column, the inner sand washing and bailing pipe column and the outer sand washing and bailing pipe column are connected through the limitation connecting hoop, the inner sand washing and bailing pipe column is in threaded connection with an inner sand washing and bailing nib, the limitation connecting hoop is in threaded connection with the back-flushing pipe, and the back-flushing packer, the outer sand washing and bailing pipe column and the outer sand washing and bailing nib are sequentially in threaded connection. With the adoption of the sand washing and bailing device, an oil layer of an oil, gas and water well is protected and is prevented from being polluted, cost is saved, the success rate of sand washing operation of the absorption well is improved, and the defects of sand washing liquid leakage, oil layer pollution, unthorough sand removal and long construction period of the traditional sand washing and bailing operation are overcome.

Description

A kind of absorption well is towards sand-bailing equipment

Technical field:

The utility model relates to a kind of technical field of petroleum extraction, and particularly a kind of absorption well is towards sand-bailing equipment.

Background technology:

At present, absorption well adopts hydraulic sand washing and machinery to drag for two kinds of methods of sand towards dragging for the sand operation usually.Yet these two kinds are dashed and to drag for the sand method and all exist some shortcomings, and hydraulic sand washing exists sand cleaning fluid leakage, the deficiency of polluted reservoir.A large amount of leakages of sand cleaning fluid not only bring difficulty to construction operation, and cost strengthens, and the construction period prolongs, and also cause down-hole accidents such as sand card, sand plug simultaneously easily.Machinery drags for sand, and to exist sand removal not thorough, the deficiency of long construction period.

The utility model content:

The technical problem that the utility model will solve provides a kind of absorption well towards sand-bailing equipment, and this device has been realized protection oil, gas, well oil reservoir, prevents oil layer pollution, practices thrift cost, improves the absorption well sand flushing job success ratio.Overcome existing dashing and dragged for the leakage of sand operation sand cleaning fluid, polluted reservoir, sand removal is not thoroughly and the deficiency of long construction period.

The technical scheme that the utility model is taked is: a kind of absorption well is towards sand-bailing equipment, comprises that sand washing tubing string, pumping packer, Nei Chong drag for that sandpipe post, backwash packer, outwash drag for the sandpipe post, Nei Chong drags for the sand nib and outwash is dragged for the sand nib; The sand washing tubing string is connected with the pumping packer thread; Gland and the welding of pumping packer; The pumping packer drags for the sandpipe male screw with Nei Chong and is connected, and spacing box cupling internal diameter drags for sandpipe post body diameter greater than interior dashing, and drags for sandpipe post box cupling external diameter less than interior dashing; In dash and to drag for the sandpipe post and be contained in spacing box cupling, backwash screen casing, backwash packer, outwash and drag in the sandpipe post; In dash and to drag for the sandpipe post and drag for the sand nib with Nei Chong and be threaded, spacing box cupling is threaded with the backwash screen casing, backwash packer, outwash are dragged for the sandpipe post, outwash is dragged for the sand nib and is threaded in order; Wherein the pumping packer is made up of top connection, urceolus, slot pipe, upper isolating ring, last packing element, spacer ring, lower rubber cylinder, lower isolating ring, central tube and lower contact; Central tube places in the slot pipe; Under the limited step at central tube top, be uniformly distributed with a plurality of changes of current hole; Gland is sleeved on the slot pipe outside and places the upper isolating ring upper end, and gland is through the slit and the central tube welding of slot pipe; The upper isolating ring upper surface has a steel ring slot, and equidistance is axially got through a circle pod apertures in steel ring slot, and pod apertures runs through packing element, spacer ring, lower rubber cylinder and lower isolating ring downwards always; The gland lower end surface be designed with a steel ring can with upper isolating ring on steel ring slot match when contacting and merge the sealing pod apertures.

The beneficial effect of the utility model is: the utility model is because the mode that has adopted the pumping packer to match with the backwash packer; Thereby guaranteed that sand cleaning fluid is circulating towards dragging in the sandpipe post all the time; Avoid the sand cleaning fluid leakage to get into oil reservoir, prevented oil layer pollution, practiced thrift cost; Keep the exploitation of oil well long-term sustainable, improve the individual well recovery ratio.

Description of drawings:

Below in conjunction with the accompanying drawing and the specific embodiment the utility model is done further detailed explanation.

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

Fig. 2 is the structural representation of pumping packer.

The specific embodiment:

Like Fig. 1, shown in Figure 2, a kind of absorption well is towards sand-bailing equipment, comprises that sand washing tubing string 1, pumping packer 3, Nei Chong drag for that sandpipe post 4, backwash packer 7, outwash drag for sandpipe post 8, Nei Chong drags for sand nib 9 and outwash is dragged for sand nib 10; Sand washing tubing string 1 is threaded with pumping packer 3; Gland 2 and 3 welding of pumping packer; Pumping packer 3 drags for sandpipe post 4 with Nei Chong and is threaded, and spacing box cupling 5 internal diameters drag for sandpipe post 4 body diameters greater than interior dashing, and drags for sandpipe post 4 box cupling external diameters less than interior dashing; In dash and to drag for sandpipe post 4 and be contained in spacing box cupling 5, backwash screen casing 6, backwash packer 7, outwash and drag in the sandpipe post 8; In dash and to drag for sandpipe post 4 and drag for sand nib 9 with Nei Chong and be threaded, spacing box cupling 5 is threaded with backwash screen casing 6, backwash packer 7, outwash are dragged for sandpipe post 8, outwash is dragged for sand nib 10 and is threaded in order; Wherein pumping packer 3 is made up of top connection 11, urceolus 12, slot pipe 15, upper isolating ring 16, last packing element 17, spacer ring 18, lower rubber cylinder 19, lower isolating ring 20, central tube 21 and lower contact 22; Central tube 21 places in the slot pipe 15; Under the limited step at central tube 21 tops, be uniformly distributed with a plurality of changes of current hole 13; Gland 2 is sleeved on slot pipe 15 outsides and places upper isolating ring 16 upper ends, and gland 2 is through the slit and central tube 21 welding of slot pipe 15; Upper isolating ring 16 upper surfaces have a steel ring slot, and equidistance is axially got through a circle pod apertures 14 in steel ring slot, and pod apertures 14 runs through packing element 17, spacer ring 18, lower rubber cylinder 19 and lower isolating ring 20 downwards always; Gland 2 lower end surface be designed with a steel ring can with upper isolating ring 16 on steel ring slot match when contacting and merge sealing pod apertures 14.

Spacing box cupling 5 internal diameters drag for sandpipe post 4 body diameters greater than interior dashing; Drag for sandpipe post 4 box cupling external diameters less than interior dashing; In dash and to drag for sandpipe post 4 bodies and pass spacing box cupling 5, interior dashing dragged for sandpipe post 4 and can in backwash packer 7 and outwash are dragged in the sandpipe post 89 meters scope, be moved by easy on and off.Dash and at first visit the sand face when dragging for sand, the normal back of the anti-circulation of turn on pump is with workover rig ground upper lifting pipe post, and pumping packer 3 is up; Gland 2 is descending, and pod apertures 14 is closed, and open in the change of current hole 13 on the central tube 21; In dash and to drag for sand nib 9 valves and close, outwash is dragged for sand nib 10 valves and is opened.Sand cleaning fluid in the sleeve pipe is circulated to ground through the change of current hole 13 of pumping packer 3; Simultaneously between backwash packer 7 and pumping packer 3, form negative pressure; Outwash is dragged for the negative pressure between the sandpipe post in causing, and reservoir sand is dragged for sand nib 10 suction outwash through outwash drag for sandpipe post 8.On carry about 9 meters after, transfer tubing string, gland 2 is up, pod apertures 14 is opened on the pumping packer 3, change of current hole 13 is closed.To drag for the sandpipe band of column empty for outwash in sand cleaning fluid got into through pod apertures 14 on the pumping packer 3 and backwash screen casing 6, and outwash is dragged for sand nib 10 valves and closed, and interior dashing dragged for sand nib 9 valves and opened.Outwash drag for reservoir sands in the sandpipe post 8 under the drive of sand cleaning fluid, get in towards dragging for sandpipe post 4, and be circulated to ground.Movable so repeatedly tubing string drags for sand to the artificial bottom of a well until dashing.

It is understandable that; More than about the specific descriptions of the utility model; Only be used to the utility model is described and be not to be subject to the described technical scheme of the utility model embodiment; Those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the utility model, to reach identical technique effect; As long as satisfy the use needs, all within the protection domain of the utility model.

Claims (1)

1. an absorption well is towards sand-bailing equipment, comprises that sand washing tubing string (1), pumping packer (3), interior dashing drag for that sandpipe post (4), backwash packer (7), outwash drag for sandpipe post (8), interior dashing dragged for sand nib (9) and outwash is dragged for sand nib (10); It is characterized in that: sand washing tubing string (1) is threaded with pumping packer (3); Gland (2) and pumping packer (3) welding; Pumping packer (3) is threaded towards dragging for sandpipe post (4) with interior, and spacing box cupling (5) internal diameter drags for sandpipe post (4) body diameter greater than interior dashing, and drags for sandpipe post (4) box cupling external diameter less than interior dashing; In dash and to drag for sandpipe post (4) and be contained in spacing box cupling (5), backwash screen casing (6), backwash packer (7), outwash and drag in the sandpipe post (8); In dash and to drag for sandpipe post (4) and be threaded towards dragging for sand nib (9) with interior, spacing box cupling (5) is threaded with backwash screen casing (6), backwash packer (7), outwash are dragged for sandpipe post (8), outwash is dragged for sand nib (10) and is threaded in order; Wherein pumping packer (3) is made up of top connection (11), urceolus (12), slot pipe (15), upper isolating ring (16), last packing element (17), spacer ring (18), lower rubber cylinder (19), lower isolating ring (20), central tube (21) and lower contact (22); Central tube (21) places in the slot pipe (15); Under the limited step at central tube (21) top, be uniformly distributed with a plurality of changes of current hole (13); Gland (2) is sleeved on slot pipe (15) outside and places upper isolating ring (16) upper end, and gland (2) is through the slit and central tube (21) welding of slot pipe (15); Upper isolating ring (16) upper surface has a steel ring slot, and equidistance is axially got through a circle pod apertures (14) in steel ring slot, and pod apertures (14) runs through packing element (17), spacer ring (18), lower rubber cylinder (19) and lower isolating ring (20) downwards always; Gland (2) lower end surface be designed with a steel ring can with upper isolating ring (16) on steel ring slot match when contacting and merge sealing pod apertures (14).

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