CN1216336A

CN1216336A - Negative pressure sand-scouring technology and mechanism

Info

Publication number: CN1216336A
Application number: CN 98114462
Authority: CN
Inventors: 刘国华
Original assignee: HUANXILING OIL FIELD LIAOHE OIL EXPLORATION ADMINISTRATION
Current assignee: HUANXILING OIL FIELD LIAOHE OIL EXPLORATION ADMINISTRATION
Priority date: 1998-11-16
Filing date: 1998-11-16
Publication date: 1999-05-12
Anticipated expiration: 2018-11-16
Also published as: CN1071397C

Abstract

The sand-scouring process for oil well is completed by negative pressure sand-scouring pipe column inside the well and the pipe column consists of sand-scouring joint in the lower part; holddown joint, holddown ring, sealing ring and change-over joint in the upper part; as well as inner and outer pipes, upper and lower packers in between. Sand-scouring liquid entering the water holes in change-over joint and passing through the annular passage between the inner and outer pipes is sprayed from the water holes of sand-scouring joint to scour sand at the bottom of the well. The sand-scouring process and equipment are simple but practical and can unblock the oil well without producing damage to oil layer.

Description

Oil well negative pressure sand washing process and device

The present invention relates to a kind of oil well that is used for, particularly smart negative pressure sand washing process and the device that shakes out that remove of heavy oil wells recovery process.

Shaking out is the particularly ubiquitous phenomenon of heavy oil wells recovery process of oil well, is one of difficult problem that influences oil well production and exploitation effect.At present, field by using in advance multiple or final sand-proofing, anti-sand technology and device, comprising adopting hydraulic sand washing or adopting sand cleaning fluids such as foam, diverting agent that the sand in the well is flushed to ground.Adopt the sand cleaning fluid sediment outflow can solve faults such as oil well sand buries, sand card, sand plug to a certain extent, oil well is returned to normal production.But, in the sand washing process, have bleed oil reservoir and oil reservoir caused serious injury of a large amount of sand cleaning fluids inevitably, thereby production brings adverse consequences to oil well.

The object of the present invention is to provide a kind of both sand washings smoothly, prevent or remove oil well sand card, sand plug fault, the reason sand cleaning fluid is not missed oil well negative pressure sand washing process and the device that oil reservoir is damaged, oil well production is brought adverse consequences again.

The present invention realizes like this.This kind oil well negative pressure sand washing process is to finish by the special negative pressure sand washing tubing string of G.I.H, and in this sand washing tubing string, there is flush-through connection the outer tube lower end by the screw thread tipping, and there is the commutation joint upper end by the box cupling tipping, and upper and lower two-stage packer is housed therebetween; Be provided with interior pipe in the outer tube, the annular space between the inner and outer pipe forms the sand cleaning fluid passage, and interior pipe lower end is connected with flush-through connection by screw thread; Outer stripper rubber, the hold-down ring of pipe compresses in being sleeved on outside the pipe and with its below in pressed joint is sleeved on.The step of implementing this sand washing process is as follows: earlier flush-through connection is connected the outer tube lower end that tipping thereon has lower packet (leather cup down), with outer tubing string down to oil well perforation section top; Then, be hinged with upper packer (leather cup up) again, and interior pipe is lowered in the outer tube, interior length of tube is greater than outer tubing string total length 1-2m; At outer tube upper end tipping commutation joint, going up pipe and commutate upper end of joint suit stripper rubber, hold-down ring and pressed joint successively in one most; Pipe suspending weight in carrying, and its lower end pin thread is contacted with flush-through connection, use the pipe wrench make-up; Tighten commutation joint and above each parts thereof successively, make the rubber sealing; At last, will be by the above-mentioned sand washing tubing string that assembles down to estimating sand face position, it is self-styled to install import, connects surface line and gets final product sand washing.In the sand washing process, sand cleaning fluid enters sand washing tubing string inner and outer pipe annular space by the oil well oil sets annular space from 4 hydrophthalmias on the commutation joint.Because the upper packer leather cup up, and external diameter is than the big 3-5mm of casing inner diameter, under the effect of inner and outer pipe annular space head of liquid, rubber is close on the internal surface of sleeve pipe, thereby sand cleaning fluid can only arrive shaft bottom sand face and the unlikely stratum that enters by this passage of inner and outer pipe annular space.Sand cleaning fluid dashes sand in the well by the hydrophthalmia of the 4-8 on the flush-through connection after arriving sand face position, because the packing effect of lower packet, sand cleaning fluid and the sand that has dashed return to ground along interior pipe.In this case, normally make up a joint at well head and to rush in, can finish whole sand washing operation.If sand washing is carried out on perforated interval, under the hydraulic blow effect, can make part well section exposed, a small amount of sand cleaning fluid and the sand stratum of might bleeding, but because the amount of liquid between the two-stage packer is metastable, thereby the sand that returns the stratum can not spue again.

Oil well negative pressure sand washing process provided by the present invention and install simple and practical, easy to implement, reliable operation utilizes this technology, device to be suitable for and to apply to finish oil well sand washing smoothly and to remove the operation of stifled card under the situation of unlikely injury oil reservoir, assurance oil mining effect.

Accompanying drawing is an oil well sand cleaning out device by negative pressure general structure schematic diagram provided by the invention.

In conjunction with the accompanying drawings enforcement of the present invention is illustrated scheming.

As shown in the figure, oil well sand cleaning out device by negative pressure provided by the invention is made up of flush-through connection 1, lower packet 2, outer tube 3, upper packer 4, commutation joint 5, stripper rubber 6, hold-down ring 7, pressed joint 8 and interior pipe 9.Wherein, flush-through connection 1 upper and lower end is respectively equipped with the negative thread that is connected with interior pipe 9 with outer tube 3, and Lower Half is uniformly distributed with 4-8 axially hydrophthalmia along the circumference, and the hydrophthalmia upper end is 45 ° of inclined-planes.Upper and lower packer 4,2 all adopts double leather cup formula packer, upper packer formal dress during assembling, the rim of a bowl up, lower packet example dress, the rim of a bowl down.Outer tube 3, interior pipe 9 adopt 3 respectively " (75.9mm) with 1 ¹/ 2 " (38.3mm) plain end oil well pipe.Commutation joint 5 upper and lower ends are respectively equipped with pin thread, and in order to be connected with outer tube 3 with pressed joint 8 respectively, the joint middle part is evenly equipped with 4 radially hydrophthalmias along periphery.Hold-down ring 7, stripper rubber 6 all are circular.Pressed joint 8 lower end band negative threads, the middle part inner headed face is provided with round platform, in order to hold-down ring is compressed.

Claims

1, a kind of oil well negative pressure sand washing process, it is characterized in that, this technology is finished by the special negative pressure sand washing tubing string of G.I.H, implementation step is as follows: flush-through connection (1) is connected outer tube (3) lower end that tipping thereon has lower packet (2), with outer tubing string down to oil well perforation well section top; Tipping upper packer (4) is lowered to interior pipe (9) in the outer tube, and interior length of tube is greater than outer tubing string total length 1-2m; At outer tube (3) upper end tipping commutation joint (5), going up pipe and commutate upper end of joint suit stripper rubber (6), hold-down ring (7) and pressed joint (8) successively in one most; Carry interior pipe (8) suspending weight, and its lower end pin thread is contacted with flush-through connection (1), use the pipe wrench make-up; Tighten commutation joint (5) and above each parts thereof successively, make the rubber sealing; Down to estimating sand face position, it is self-styled to install well head, connects surface line, can carry out sand washing, rushes in by making up a joint at well head, finishes whole sand washing operation with this sand washing tubing string.

2, a kind of oil well sand cleaning out device by negative pressure, form by flush-through connection (1), upper and lower packer (4), (2), inner and outer pipe (9), (3), commutation joint (5), stripper rubber (6), hold-down ring (7) and pressed joint (8), it is characterized in that, there is flush-through connection (1) outer tube (3) lower end by the screw thread tipping, there is commutation joint (5) upper end by the box cupling tipping, and upper and lower packer (4), (2) are housed therebetween; Be provided with interior pipe (9) in the outer tube (3), interior pipe lower end is connected with flush-through connection (1) by screw thread; Commutation joint (5) upper end is connected with pressed joint (8) with screw thread, and pressed joint (8) is sleeved on outside the interior pipe (9) and its below is sleeved on outer stripper rubber (6), the hold-down ring (7) of interior pipe and compresses.

3, oil well sand cleaning out device by negative pressure according to claim 2 is characterized in that, sand washing joint (1) upper and lower end is respectively equipped with negative thread, and Lower Half is uniformly distributed with 4-8 axially hydrophthalmia along the circumference, and the hydrophthalmia upper end is 45 ° of inclined-planes,

4, oil well sand cleaning out device by negative pressure according to claim 2 is characterized in that, commutation joint (5) upper and lower end is respectively equipped with pin thread, and the middle part is uniformly distributed with 4 radially hydrophthalmias along the circumference.