CN202560184U

CN202560184U - Streamlined slit sand control sieve tube

Info

Publication number: CN202560184U
Application number: CN 201220098161
Authority: CN
Inventors: 吕广忠; 李振泉; 张建乔; 郭迎春; 邓玉珍
Original assignee: China Petroleum and Chemical Corp; Sinopec Shengli Geological Scientific Reserch Institute
Current assignee: China Petroleum and Chemical Corp; Sinopec Shengli Geological Scientific Reserch Institute
Priority date: 2012-03-16
Filing date: 2012-03-16
Publication date: 2012-11-28
Anticipated expiration: 2022-03-16

Abstract

The utility model provides a streamlined slit sand control sieve tube, which comprises a sieve tube body, wherein a slit on the sieve tube body is in a smooth curve shape with a flared entrance, slightly larger width, slightly small middle part and relatively large back part. The slits are spirally alternatively arranged from a position 100-300mm apart from the end, the vertical length of the slit is 50-120mm, and the space of the slit is 25-60 strip/ring; the width of the slit entrance is 0.1-0.8mm, the width of the slit exit is 0.8-3.0mm, and the entrance and the exit are streamlines, and a sharp corner is not present. The shape of the channel of the sleeve tube through which crude oil passes, is modified, thus the shape of the slit corresponds to the passing track of the crude oil through the slits to the maximum extent. The streamlined slit sand control sieve tube has features of strong self-cleaning action, small pressure loss, long service life and ideal sand control effect.

Description

A kind of streamlined slot sand control screen

Technical field

The utility model relates to down-hole completion and the sand control treatment device that is used for petroleum drilling and mining, relates to a kind of streamlined slot sand control screen concretely.

Background technology

Sand production is one of major issue that is faced loose rock oil reservoir and oil field ultra-high water-containing productive life; The oil well in oil field 80% all needs sand control according to statistics; The main harm of shaking out is: be prone to cause the reduce or stop production of oil well, the wearing and tearing of aggravation ground and underground equipment, and cause that damage and the oil well of sleeve pipe are scrapped etc.

Cutting seam sieve tube is as one of main completion and sand preventing tool, is applied in the oil recovery sand control of completion and sanding formation oil reservoir of horizontal well, sidetracked hole, Multilateral Wells etc. of petroleum industry because of it has intensity height, advantage that cost is low increasingly extensively.

Widely used cutting seam sieve tube adopts forms such as rectangle slot, keystone cut, triangle slot usually on the at present domestic and international oil field; Mainly there is following problem in these cutting seam sieve tubes: the inside and outside width of (1) rectangle slot is consistent; The crude oil area of passage is little; Oil flow resistance is big, and easy sand plug, and sand controlling result is poor; (2) keystone cut and triangle slot inlet is sharp-pointed, and in the crowded effect of rubbing of crude oil and the fine sand grains that carries thereof down, sealing is easy to wear, and lack application life; (3) rectangular channel of composite slitted entrance is not inconsistent with the inlet trace shape of oil stream, and oil stream exists the pressure loss to cause the pressure loss of oil stream big in the entrance.Simultaneously, oil stream is prone in the entrance slot is caused erosive wear, causes its sand controlling result poor.Get into the middle and later periods of exploitation along with the oil field; Strata pressure diminishes; Oil stream becomes the important performance assessment criteria of screen casing gradually through the pressure loss of screen casing, and influences the direct oil well well workover cycle application life of screen casing, the too short sharp increase that possibly cause cost of oil production in application life.Therefore, improve the slot channel shape of cutting seam sieve tube, the exploitation pressure loss is little, long service life, the desirable cutting seam sieve tube of sand controlling result have crucial technology and economic implications.

Summary of the invention

The purpose of the utility model is to provide a kind of streamlined slot sand control screen; Through crude stream is improved design through the channel shape of screen casing; Make slot configuration farthest meet the trace that crude stream is crossed slot, this streamlined slot sand control screen self-cleaning action is strong, the pressure loss is little, long service life, sand controlling result desirable.

The purpose of the utility model can realize through following technical measures:

This streamlined slot sand control screen comprises the screen casing body, and the slot on the screen casing body is the smooth curve shape that width is big slightly, the centre is slightly little, the rear portion is bigger of a little loudspeaker of inlet.

The purpose of the utility model also can realize through following technical measures:

Described slot is staggered from beginning spiral apart from end 100～300mm, and the longitudinal length of slot is that 50～120mm, spacing are 25～60/circle; Described slot entrance width is that 0.1～0.8mm, exit width are 0.8～3.0mm, and entrance and exit is streamlined; No sharp corners.

The utility model is through improving the shape of slot passage, and the streamline-shaped of whole slot conforms to the trace of crude stream through screen casing, and the whole piece slot to show as little loudspeaker width that enters the mouth big slightly; The centre is slightly little; The smooth curve that the rear portion is bigger, no segmentation, no flex point; Make screen casing unstressed centrostigma in the whole piece slot in the running status of down-hole, do not have oil stream and stream phenomenon.In the oil development later stage, even the entrance material has erosive wear, the slot middle part can guarantee that still the outer sand of design size is blocked in the screen casing periphery, and sand controlling result is desirable all the time in the cycle of regulation in application life thereby make screen casing.This utility model product has reduced the pressure loss of crude stream through screen casing, has improved the application life of screen casing greatly, and it is remarkable to promote the screen sand control effect, and the economic benefit of screen casing increases substantially.

The advantage of the utility model comprises: the pressure loss is little, is beneficial to the raising production capacity; Long service life reduces the oil field development cost; Self-cleaning action is strong, and sand controlling result is desirable.

Description of drawings:

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

The slot configuration sketch map that Fig. 2 amplifies for Fig. 1 horizontal section.

Wherein, 1-screen casing body, 2-slot.

The specific embodiment

With reference to the accompanying drawings the utility model is described further.

With reference to Fig. 1, this streamlined slot sand control screen comprises screen casing body 1, and the slot 2 on the screen casing body 1 is from being staggered apart from the beginning spiral apart from body end 100～300mm; The longitudinal length of slot is 50～120mm, and the slot spacing is 25～60 a/circle, when increasing substantially its intensity; Eliminated the intersegmental dead leg of slot; Screen casing body 1 can be aimed at the oil reservoir preforation tunnel more accurately, has simplified construction technology, has promoted sand controlling result.

With reference to Fig. 2; Slot 2 cross sectional shapes on the screen casing body 1 are streamlined, and the width of entrance is designed to 0.1～0.8mm, can satisfy the different oil well of the granule size that shakes out and use; The exit width is designed to 0.8～3.0mm, and the area of passage of whole slot improves 10%～30% than other shape.When sandy crude flow to slot through inlet, the outer big sand grains of design size was blocked in the periphery by screen casing body 1, forms sand bridge, and as the first road sand control barrier of screen casing, the grit in the design size is carried through slot entering screen casing body 1 by crude oil and adopted to ground.In this streamlined slot outer little grit is carried easily by crude oil, be difficult in slot, piling up, the self-cleaning action of screen casing body 1 strengthens.

In the use of screen casing body 1, if barefoot completion then links to each other screen casing body 1 top with packer, the bottom directly gets into the oil well bottom, and sandy crude is adopted to ground after the slot on the screen casing body 12 purifies; In the sand control treatment of separate zone production oil well; The upper and lower part of screen casing body 1 all links to each other with packer; Design exploitation oil reservoir or preforation tunnel are aimed in the middle part of screen casing body 1, and the sandy crude in the design oil reservoir purifies the back through the slot on the screen casing body 12 and adopted to ground, and the outer oil of design oil reservoir flows and isolated and without screen casing body 1 by packer; Thereby make the scope of application of screen casing body 1 wider, practicality is stronger.

Claims

1. a streamlined slot sand control screen comprises the screen casing body, it is characterized in that the slot (2) on the screen casing body (1) is the smooth curve shape that width is big slightly, the centre is slightly little, the rear portion is bigger of a little loudspeaker of inlet.

2. a kind of streamlined slot sand control screen according to claim 1 is characterized in that described slot (2) is staggered from beginning spiral apart from end 100～300mm, and the longitudinal length of slot (2) is that 50～120mm, spacing are 25～60/circle.

3. a kind of streamlined slot sand control screen according to claim 1 is characterized in that described slot (2) entrance width is that 0.1～0.8mm, exit width are 0.8～3.0mm, and entrance and exit is streamlined.