CN109138936B

CN109138936B - Perforation operation auxiliary device

Info

Publication number: CN109138936B
Application number: CN201710453066.XA
Authority: CN
Inventors: 郭秀庭; 强华; 宁坤; 任世举; 翁博; 卜文杰
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2017-06-15
Filing date: 2017-06-15
Publication date: 2021-01-01
Anticipated expiration: 2037-06-15
Also published as: CN109138936A

Abstract

The invention discloses an auxiliary device for perforating operation. The perforation operation auxiliary device comprises: the device comprises a circular tube-shaped device body (1) with an inner cavity (Y) and a cone-shaped sliding block (2) capable of sliding along the inner cavity (Y), wherein a plurality of downward inclined flow guide holes (101) are formed in the circumference of the device body (1), an inner step (102) is arranged on the inner wall of the device body (1), the lowest point (10111) of an upper port (1011) of each flow guide hole (101) is located on the upper surface (1021) of the inner step (102), and the lower surface (201) of the sliding block (2) can abut against the upper surface (1021) of the inner step (102). The perforating operation auxiliary device greatly increases the probability of the perforating rod for igniting the ignition head, and greatly reduces impurities such as gravel and stones at the position of the casing near the perforating string, thereby greatly improving the success probability of perforating operation.

Description

Perforation operation auxiliary device

Technical Field

The invention relates to a perforation operation auxiliary device.

Background

In oil field production, there are increasing number of wells with casing, which require perforating operations on the casing to allow the crude oil in the formation to flow through the casing into the wellbore.

In general, in a perforating operation, a perforating string and an oil pipe are put into a casing from a wellhead, a perforating gun is arranged in the perforating string, a plurality of perforating bullets with ignition heads are loaded in the perforating gun, a perforating rod is put into the oil pipe from the wellhead, the perforating rod strikes the ignition heads, the ignition heads are ignited, the perforating gun ejects the perforating bullets from the perforating string, the ignition heads ignite the perforating bullets, and the exploding perforating bullets eject a plurality of eyelets from the casing.

In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:

when the casing is being run, a slurry circulation is established, and the slurry contains many impurities such as gravel and stones. When the well is drilled, the well control fluid is pumped from the oil pipe, and the well control fluid also contains impurities such as gravel, stones and the like. Make impurity deposits such as gravel and stone in the first top of the ignition and the cover of the perforation tubular column that oil pipe transferred like this, cause the perforation stick of putting in from oil pipe and impurity production friction such as a large amount of gravel and stone, lead to the striking dynamics of the first insufficient of ignition, the failure of igniting, thereby perforation operation failure, even if the ignition is successful, the first detonation perforating bullet of ignition, the perforating bullet of explosion receives the resistance of impurity such as a large amount of gravel and stone, also can cause not reach the requirement to the sleeve pipe perforation, perforation operation effect is poor promptly.

Disclosure of Invention

In order to solve the technical problem, the invention provides an auxiliary device for perforation operation. The technical scheme is as follows:

a perforating operation assistance device comprising:

a device body in the shape of a circular tube having an inner cavity, and

a conical slide block capable of sliding along the inner cavity,

wherein, a plurality of oblique downward flow guide holes are arranged along the circumference of the device body, an inner step is arranged on the inner wall of the device body, the lowest point of the upper port of the flow guide hole is positioned on the upper surface of the inner step,

the lower surface of the slider can abut against the upper surface of the inner step.

Preferably, the slider is made of ceramic or glass.

Specifically, the diameter of the lower surface of the slider is smaller than the inner diameter of the device body above the inner step.

Preferably, the inner step is an annular inner step.

Preferably, the plurality of flow guide holes are uniformly distributed along the circumference of the device body.

Specifically, the number of the flow guide holes is 4-8.

Specifically, the upper end of the device body has an internal thread, and the lower end of the device body has an external thread.

Preferably, the device body includes: the upper joint, the middle pipe body and the lower joint are sequentially connected from top to bottom.

More preferably, the upper joint, the intermediate pipe body and the lower joint are connected by screw threads.

The technical scheme provided by the embodiment of the invention has the beneficial effects that: the oil pipe, the perforating operation auxiliary device and the perforating string are connected in sequence, wherein a slide block is not arranged in the perforating operation auxiliary device, the connected oil pipe, the perforating operation auxiliary device and the perforating string are put into the casing from a well mouth, the oil pipe and the casing are filled with fluid containing impurities such as gravel, stones and the like, a cone-shaped slide block is put into the oil pipe from the well mouth, the slide block falls into an inner cavity of a device body of the perforating operation auxiliary device, the lower surface of the slide block is abutted against the upper surface of an inner step of the device body, a perforating rod is immediately put into the oil pipe, the perforating rod moves downwards to generate huge downward impact force, the fluid containing the impurities such as the gravel, the stones and the like in the oil pipe flows downwards, the lower surface of the slide block is abutted against the upper surface of the inner step of the device body, and the lowest point of an upper port of the flow guide hole is positioned on the, the conical lateral wall of slider is located the top of the minimum of the last port of water conservancy diversion hole, therefore, the fluid that contains impurity such as gravel and stone of downstream discharges into the cover from slant decurrent water conservancy diversion hole in, make impurity such as gravel and stone in the fluid in the cover move down, impurity such as gravel and stone near the sleeve pipe department of perforation tubular column reduces, the perforation stick breaks the slider, broken slider is spout from slant decurrent water conservancy diversion hole and perforation tubular column, strike impurity such as gravel and stone in perforation tubular column and the sleeve pipe and move down, make impurity such as gravel and stone near the sleeve pipe department of perforation tubular column reduce greatly like this, the perforation stick strikes the ignition head and with it, the perforating gun jets out the perforating bullet from the perforation tubular column, ignition head ignition bullet, the perforating bullet of explosion jets out a lot of eyelets with the sleeve pipe. Therefore, the perforating operation auxiliary device greatly increases the probability of the perforating rod to ignite the ignition head, and greatly reduces impurities such as gravel, stones and the like at the position of the casing near the perforating pipe column, thereby greatly improving the success probability of perforating operation.

Drawings

FIG. 1 is a schematic diagram of a perforation aid according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another embodiment of the perforating operation assist device of the present invention;

3-7 are diagrams illustrating the use of a perforation aid according to embodiments of the present invention;

the reference numerals in the drawings denote:

1. a device body; 101. a flow guide hole; 1011. the upper port of the diversion hole; 10111. the lowest point of the upper port of the flow guide hole; 102. an inner step; 1021. an upper surface of the inner step; 103. an upper joint; 104. a middle tube body; 105. a lower joint;

2. a slider; 201. a lower surface of the slider;

y, an inner cavity;

10. a perforation operation assisting device;

20. an oil pipe;

30. perforating the tubular column;

40. a sleeve;

50. a perforating rod.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a perforation operation assisting device according to an embodiment of the present invention. Referring to FIG. 1, the perforating operation assistance device 10 includes:

a device body 1 in the form of a circular tube having an inner cavity Y, and

a cone-shaped slide block 2 which can slide along the inner cavity Y,

wherein, a plurality of downward inclined diversion holes 101 are arranged along the circumference of the device body 1, an inner step 102 is arranged on the inner wall of the device body 1, the lowest point 10111 of the upper port 1011 of the diversion hole is positioned on the upper surface 1021 of the inner step 102,

the lower surface 201 of the slider may abut against the upper surface 1021 of the inner step.

In the embodiment of the present invention, as shown in fig. 1, the apparatus body 1 may be an integrally formed structure, or as shown in fig. 2, the apparatus body 1 includes: an upper joint 103, a middle pipe body 104 and a lower joint 105 which are connected in sequence from top to bottom. The upper end of the upper joint 103 is provided with internal threads which are in threaded connection with the oil pipe 20, the lower end of the lower joint 105 is provided with external threads which are in threaded connection with the perforating string 30, the lower end of the upper joint 103 and the upper end of the middle pipe body 104 can be in threaded connection, and the lower end of the middle pipe body 104 and the upper end of the lower joint 105 can also be in threaded connection.

The operation of the perforation operation assisting device provided by the embodiment of the present invention will be explained with the structure of the perforation operation assisting device shown in fig. 2. The principle is as follows:

as shown in fig. 3, the oil pipe 20, the perforating operation assisting apparatus 10 and the perforating string 30 are connected in sequence, wherein the perforating operation assisting apparatus 10 is not provided with a conical shaped slider 2, the perforating string 30 is provided with a perforating gun loaded with a plurality of perforating charges having firing heads, the connected oil pipe 20, perforating operation assisting apparatus 10 and perforating string 30 are lowered into the casing 40 from the wellhead, the oil pipe 20 and the casing 40 are filled with fluid containing impurities such as gravel and stone, the conical shaped slider 2 is dropped into the oil pipe 20 from the wellhead, as shown in fig. 4, the slider 2 falls into the cavity Y of the apparatus body 1 of the perforating operation assisting apparatus 10, and the lower surface 201 of the slider 2 abuts on the upper surface 1021 of the inner step 102 of the apparatus body 1, and then the perforating rod 50 is dropped into the oil pipe 20, as shown in fig. 5, the perforating rod 50 moves downward to generate a large downward impact force, the fluid containing impurities such as gravel and stone in the oil pipe 20 flows downwards, because the lower surface 201 of the sliding block 2 is abutted against the upper surface 1021 of the inner step 102 of the device body 1, the lowest point 10111 of the upper port 1011 of the flow guiding hole is positioned on the upper surface 1021 of the inner step 102, and the conical side wall of the sliding block 2 is positioned above the lowest point 10111 of the upper port 1011 of the flow guiding hole, therefore, the fluid containing impurities such as gravel and stone which moves downwards is discharged into the casing 40 from the flow guiding hole 101 which is inclined downwards, the impurities such as gravel and stone in the fluid in the impact casing 40 move downwards, the impurities such as gravel and stone in the casing 40 near the perforating string 30 are reduced, then as shown in figure 6, the perforating rod 50 breaks the sliding block 2, the broken sliding block is ejected from the flow guiding hole 101 which is inclined downwards and the perforating string 30, and the impurities such as gravel and stone in the perforating string 30 and the casing 40 move downwards, this results in a substantial reduction of debris, such as gravel and rocks, at the casing 40 near the perforating string 30, as shown in figure 7, the perforating rod 50 strikes the firing head and fires it, the perforating gun ejects the charges from the perforating string 30, the firing head detonates the charges, and the exploding charges eject a plurality of perforations from the casing 40. Therefore, the perforating operation auxiliary device greatly increases the probability of the perforating rod 50 igniting the ignition head, and greatly reduces impurities such as gravel, stones and the like at the position of the casing 40 near the perforating string 30, thereby greatly improving the success probability of perforating operation.

In practical applications, the impurities in the fluid containing impurities such as gravel and stone also include rust generated by oil pipes and the like, and the rust is mainly present in the fluid in the form of scales and rust blocks.

In practical use, the length of the perforating rod 50 is usually about 1.8m, and the ratio of the perforating rod 50 to the perforating operation assisting device of the present invention is reduced in order to highlight the structure of the perforating operation assisting device of the present invention.

In order to make the slide block 2 be broken into small pieces and smoothly ejected from the flow guide hole 101 after the perforating rod 50 impacts the slide block 2, the slide block 2 is made of ceramic or glass with high brittleness.

Since the slider 2 is cone-shaped, the largest diameter of the slider 2 is the lower surface 201 thereof. In practical application, the diameter of the lower surface 201 of the slider 2 is smaller than the inner diameter of the device body 1 above the inner step 102, so that the slider 2 can be smoothly lowered into the perforating auxiliary device.

In a preferred embodiment of the present invention, the inner step 102 is an annular inner step. Because the slider 2 is cone-shaped, the lower surface 201 of the slider 2 is circular, when abutting against the upper surface 1021 of the inner step, the lower surface 201 of the slider 2 can seal the annular inner step 102, and because the upper port 1011 of the flow guide hole 101 is positioned on the upper surface 1021 of the inner step 102, the conical side wall of the slider 2 is positioned above the lowest point 10111, so that impurities such as falling gravel, stones and the like can only flow out of the flow guide hole 101, but cannot flow out of the lower end of the perforating operation auxiliary device.

In the embodiment of the present invention, the plurality of flow guiding holes 101 are uniformly distributed along the circumference of the device body 1, and the number of the flow guiding holes 101 may be 4 to 8, and is preferably 6 to 8. The angle of the flow guide holes 101 with the horizontal plane may be 45 to 80 degrees, preferably 60 to 75 degrees, so that impurities such as gravel and stones in the oil pipe 20 can more easily flow out of the flow guide holes 101.

In practical use, as shown in fig. 3, the upper end of the apparatus body 1 has an internal thread, and the lower end of the apparatus body 1 has an external thread. The perforating operation assisting device 10 is screwed with the oil pipe 20 through the internal thread of the upper end of the device body 1, and is screwed with the perforating string 30 through the external thread of the lower end of the device body 1.

The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A perforating operation assistance device comprising:

a device body (1) in the form of a circular tube having an inner cavity (Y), and

the conical sliding block (2) can slide along the inner cavity (Y), and when the sliding block (2) slides, fluid in the device body (1) can be driven to flow;

the device comprises a device body (1), wherein a plurality of obliquely downward flow guide holes (101) are formed in the circumference of the device body (1), an inner step (102) is formed in the inner wall of the device body (1), and the lowest point (10111) of an upper port (1011) of each flow guide hole (101) is located on the upper surface (1021) of the inner step (102);

the lower surface (201) of the slide block (2) can abut against the upper surface (1021) of the inner step (102).

2. Device according to claim 1, characterized in that the slide (2) is made of ceramic or glass.

3. Device according to claim 1, characterized in that the diameter of the lower surface (201) of the slider (2) is smaller than the inner diameter of the device body (1) above the inner step (102).

4. The device of claim 1, wherein the inner step (102) is an annular inner step.

5. The device according to claim 1, characterized in that a plurality of said deflector holes (101) are evenly distributed along the circumference of said device body (1).

6. The device according to claim 1, characterized in that the number of flow-guiding holes (101) is 4-8.

7. The device according to claim 1, characterized in that the upper end of the device body (1) has an internal thread and the lower end of the device body (1) has an external thread.

8. The device according to claim 1, characterized in that the device body (1) comprises: an upper joint (103), a middle pipe body (104) and a lower joint (105) which are connected in sequence from top to bottom.

9. The device according to claim 8, characterized in that said upper connector (103), said intermediate tubular body (104) and said lower connector (105) are connected by means of threads.