CN2550499Y

CN2550499Y - Double layer double trapezoid spacer seam screen pipe for oil well

Info

Publication number: CN2550499Y
Application number: CN 02268165
Authority: CN
Inventors: 郝兴; 张峻; 马俊生; 卜凡俭; 苏庆欣; 邵宣涛; 李晓海; 张兴瑞
Original assignee: Shengli Oil Production Field Shengli Oil Field Co Ltd China Petrochemical G
Current assignee: Shengli Oil Production Field Shengli Oil Field Co Ltd China Petrochemical G
Priority date: 2002-07-16
Filing date: 2002-07-16
Publication date: 2003-05-14
Anticipated expiration: 2012-07-16

Abstract

The utility model relates to a sieve tube used for underground oil well, in particular to a gap sieve tube of a double layer and double trapezoid for an oil well, comprising an external connector, an internal connector and an intermediate filtering body; wherein, the intermediate filtering body comprises a plurality of circular ring blocks and washers and is fixedly connected with the external connector and the internal connector through a tie bar; 3 to 6 round holes penetrating through the tie bar are intervally distributed at the peripheral of the circular ring blocks; the central section of the circular ring block is a round hole communicated with the internal and the external connectors; the washer is arranged on a tie bar between the circular ring blocks. The utility model has the advantages of small filtering resistance and good filtering result after double layer filtering. And double layer trapezoid gap is not easily blocked.

Description

The double-deck double trapezoid space of a kind of oil well screen casing

One, technical field: the utility model relates to the screen casing that use a kind of oil well down-hole, the double-deck double trapezoid space of particularly a kind of oil well screen casing.

Two, background technology: existing well screen generally adopts the laser slotted pipe.Because the filter sand slit of laser slotted pipe is elongated rectangularl runner, be easy to be blocked by the oil well sand grains, filtration resistance is big, the filter sand weak effect, causes oil well quality and sand controlling result to reduce or inefficacy, and serious also will cause the workover operation.

Three, summary of the invention: the purpose of this utility model is exactly the problems referred to above that exist at existing screen casing global design, and a kind of double-deck double trapezoid space of oil well screen casing of split combination is provided.Comprise socket 1, spigot 2 and intermediate filtered body composition, it is characterized in that: the intermediate filtered body is composed of a fixed connection by lacing wire 4 and socket 1, spigot 2 by a plurality of annulus pieces 3 and pad 5, annulus piece 3 peripheral intervals are distributing 3-6 and are passing through the circular hole of lacing wire 4, in the middle of the annulus piece 3 is the circular hole that is communicated with interior socket, and pad 5 is installed in the lacing wire 4 between the annulus piece 3.

Its improvement project is: runner A is distributing between the circular hole of annulus piece 3 peripheries; On the inside and outside edge of annulus piece 3 runner A, it is trapezoidal to be processed with inner bevel.

That characteristics of the present utility model are that little, the double-deck trapezoidal slit of filtration resistance is difficult for is blocked, filter sand is effective behind the double medium filtration.

Four, description of drawings:

Fig. 1 is overall structure figure of the present utility model;

Fig. 2 is that the B of the annulus piece 3 among Fig. 1 is to view.

Five, the specific embodiment:

Contrast accompanying drawing 1, the double-deck two terraced space screen casings of oil well are connected to form by lacing wire 4 integral body by socket 1, spigot 2, annulus piece 3, pad 5.At socket 1, spigot 2, annulus piece 3 peripheral intervals 4 circular holes that distributing, annulus piece 3 and pad 5 are fixed therein with the nut at four lacing wires 4 and two ends.The thickness of pad 5 is selected according to oil well sand grains diameter, generally between the 0.1-1 millimeter.The quantity of annulus piece 3 is mated as required.

Contrast accompanying drawing 2, runner A is distributing between the circular hole of annulus piece 3 peripheries; On the inside and outside edge of annulus piece 3 runner A, it is trapezoidal to be processed with inner bevel, forms the inside and outside little tape edge of double trapezoid in the middle of the combination back.

The double-deck double trapezoid space of this oil well screen casing is abutted against captacula and links and be connected on oil well pump lower end in the oil well, and the oil well sand grains is isolated from outside the oil pipe, and crude oil enters oil pipe by double-deck double trapezoid seam, does not contain sand or contains sand grains less to protect the crude oil that produced.The inside and outside double trapezoid seam of this screen casing system, after the oil after the filtration flow to this screen casing, the runner slit was more and more wideer.So filtration resistance is little, the slit is difficult for blocked, and filter sand is effective behind double medium filtration.

Claims

1. the double-deck double trapezoid space of oil well screen casing, comprise socket (1), spigot (2) intermediate filtered body composition, it is characterized in that: the intermediate filtered body is composed of a fixed connection by lacing wire (4) and socket (1), spigot (2) by a plurality of annulus pieces (3) and pad (5), annulus piece (3) the peripheral intervals 3-6 that distributing passes through the circular hole of lacing wire (4), is the circular hole that is communicated with interior socket in the middle of the annulus piece (3), pad (5) is installed in the lacing wire (4) between the annulus piece (3).

2. the double-deck double trapezoid space of oil well according to claim 1 screen casing is characterized in that: runner (A) is distributing between the circular hole of annulus piece (3) periphery.

3. the double-deck double trapezoid space of oil well according to claim 2 screen casing is characterized in that: on the interior outer edge of annulus piece (3) runner (A), it is trapezoidal to be processed with inner bevel.