CN201439709U

CN201439709U - Dynamic negative pressure gun perforator

Info

Publication number: CN201439709U
Application number: CN2009201004964U
Authority: CN
Inventors: 郑长建; 刘桥; 丁开勋; 蔡山; 王军
Original assignee: Daqing Oilfield Co Ltd
Current assignee: Daqing Oilfield Co Ltd
Priority date: 2009-07-29
Filing date: 2009-07-29
Publication date: 2010-04-21
Anticipated expiration: 2019-07-29

Abstract

The utility model provides a dynamic negative pressure gun perforator, which comprises a gun body (10), bullet holder disks (20, 21), a bullet holder (30), punching bullets (40, 41, 42, 43), perforating bullets (50, 51), blasting fuse (60) and fixing bolts (70, 80), wherein the length of the gun body is bigger than that of the existing gun body; the perforating bullets are installed at the corresponding positions of the bullet holder according to the distribution of the oil layers as before; and the number of the round holes on the bullet holder is more than that of the perforating bullets, so the punching bullets can be installed in the rest empty round holes. The punching bullets are special bullets for perforating the gun body only, without causing damages to the sleeve and the cement ring, so after the gun perforator is detonated, the holes perforated on the gun body are more than the holes perforated by the original gun perforator and the pressure relief room is enlarged, thereby the pressure in the shaft can be released instantly and dynamic negative pressure can be realized.

Description

The dynamic negative-pressure perforator

Technical field:

The utility model relates to the perforator that uses in a kind of oil field perforation technical field, is used to carry out the perforating system of perforating oil gas well completion.

Background technology:

The perforator that generally use in present oil field as shown in Figure 1, form by rifle body 1, firing mount dish 2, firing mount 3, perforating bullet 4, detonating fuse 5, after its weak point was that detonating fuse 5 is ignited perforating bullet 4 emissions, zone, duct, close-range shot hole formed compacting zone in the stratum, makes this regional permeability decrease.

The utility model content:

Technical problem to be solved in the utility model provides a kind of dynamic negative-pressure perforating system.

For solving technical problem of the prior art, technical solution of the present utility model is an oil gas well dynamic negative-pressure perforator, comprises rifle body, firing mount, firing mount dish, perforating bullet, punching bullet, set bolt, detonating fuse; Wherein the rifle body is a hollow cylinder, and cavity is successively vertically that three rank are cylindric, and the diameter on two rank is identical up and down, all greater than the diameter on second rank, middle part; The firing mount dish is fixed by bolts to second rank of rifle body, up and down each one; Firing mount is a hollow cylinder, and barrel upper edge axial screw shape is evenly distributed with circular hole, and firing mount is bolted to connection on the firing mount dish; Perforating bullet distributes by oil reservoir and is installed in relevant position on the firing mount, and the punching bullet is evenly installed in the vacant circular hole of firing mount, and perforation, punching bullet directly are placed in the circular hole of firing mount; A detonating fuse wherein end passes successively from perforation, punching bullet portion, twines along the firing mount spiral, with perforation, the compressing tablet bending of punching bullet portion, detonating fuse and body is compressed then, and the other end is installed on the priming device.

The utility model perforator can realize that the principle of dynamic negative-pressure is: the rifle body of this perforator is compared with original perforator, rifle body lengthening, after perforating bullet still is installed on the relevant position of firing mount by the oil reservoir distribution situation, remain circular hole on the firing mount in addition, in the vacant circular hole of firing mount the punching bullet can be installed like this, the punching bullet be a kind of to the perforate of rifle body, do not injure sleeve pipe, the special bullet of cement sheath, also can claim " perforate bullet ", so after perforator detonated, it was many to be penetrated the more former perforator of wearing of eyelet quantity on the rifle body, has enlarged the pressure release space, thereby but abrupt release pit shaft internal pressure realizes dynamic negative-pressure.

Technique effect of the present utility model is: by adding the spear body length, enlarge the pressure release space, perforating bullet and punching bullet are installed on firing mount simultaneously, increase the eyelet gross area on the rifle body, can be behind perforation moment reduce pressure differential in stratum and the pit shaft, thereby realize the transient behavior negative pressure, effectively remove perforation and pollute, and improve zone, duct, close-range shot hole permeability.

Description of drawings:

Fig. 1 is the structural representation of perforator in the background technology;

Fig. 2 is the structural representation of firing mount dish;

Fig. 3 is a structural representation of the present utility model;

Among the figure: 10 rifle bodies, 20,21 firing mount dishes, 30 firing mounts, 40,41,42,43 punching bullets, 50,51 perforating bullets, 60 detonating fuses, 70,80 set bolts.

The specific embodiment:

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 3 is a structural representation of the present utility model, and as shown in the figure, this dynamic negative-pressure perforator comprises rifle body 10, firing mount dish 20,21, firing mount 30, punching bullet 40,41,42,43, perforating bullet 50,51, detonating fuse 60, set bolt 70,80;

Wherein rifle body 10 is hollow cylinders, and cavity is successively vertically that three rank are cylindric, and the diameter on two rank is identical up and down, all greater than the diameter on second rank, middle part, in rifle body 10 tops, bottom internal thread is arranged, and is connected with external screw thread beyond the rifle body respectively;

Fig. 2 is the structural representation of firing mount dish 20,21, and in conjunction with shown in Figure 3, firing mount dish 20,21 is fixed in second rank of rifle body 10 with bolt 70 respectively, up and down each one;

Firing mount 30 is a hollow cylinder, and its upper edge axial screw shape is furnished with circular hole, and firing mount 30 is fixedly connected on the firing mount dish 20,21 by bolt 80;

Perforating bullet 50,51 distributes by oil reservoir and is installed in relevant position on the firing mount 30, and punching bullet 40,41,42,43 is evenly installed in firing mount 30 vacant circular holes, and perforation, punching bullet directly are placed in the circular hole of firing mount 30;

Detonating fuse 60 passes successively from perforation, punching bullet portion, twines along firing mount 30 spirals, perforation, the compressing tablet bending of punching bullet portion is compressed detonating fuse 60 and body to be installed on priming device and perforating bullet 50,51, the punching bullet 40,41,42,43 then.

In the down-hole, priming device detonates behind the detonating fuse 60, and perforating bullet 50,51,40,41,42,43 emissions of punching bullet form eyelet on rifle body 10.When the pressure in the pit shaft during greater than rifle body internal pressure, pit shaft liquid enters rifle body inside by the eyelet on the rifle body, makes the instantaneous reduction of pit shaft internal pressure, realizes the dynamic negative-pressure effect, improves zone, duct, close-range shot hole permeability.

Claims

1. a dynamic negative-pressure perforator comprises rifle body (10), firing mount dish (20,21), firing mount (30), punching bullet (40,41,42,43), perforating bullet (50,51), detonating fuse (60), set bolt (70,80); Wherein rifle body (10) is a hollow cylindrical, and cavity is successively from the top down that three rank are cylindric, and the diameter on two rank is identical up and down, greater than the diameter on second rank, middle part; Firing mount dish (20,21) is fixed on bolt (70) in second rank of rifle body (10), up and down each one; Firing mount (30) is a hollow cylinder, and barrel upper edge axial screw shape is evenly distributed with circular hole, and firing mount (30) is fixedly connected on the firing mount dish (20,21) by bolt (80), and perforation, punching bullet are placed in the circular hole of firing mount (30); Detonating fuse (60) one ends pass successively and compress with body from perforation, punching bullet portion, the other end is installed on the priming device, it is characterized in that: perforating bullet (50,51) distributes by oil reservoir and is installed in upward relevant position of firing mount (30), and punching bullet (40,41,42,43) is evenly installed in the vacant circular hole of firing mount (30).