CN110118077B

CN110118077B - Perforating device for well completion operation

Info

Publication number: CN110118077B
Application number: CN201810114743.XA
Authority: CN
Inventors: 戴文潮; 赵晨熙; 程光明; 邹传元; 朱和明
Original assignee: China Petroleum and Chemical Corp; Sinopec Research Institute of Petroleum Engineering
Current assignee: China Petroleum and Chemical Corp; Sinopec Research Institute of Petroleum Engineering
Priority date: 2018-02-06
Filing date: 2018-02-06
Publication date: 2021-06-04
Anticipated expiration: 2038-02-06
Also published as: CN110118077A

Abstract

The invention provides a perforating device for well completion operation, which comprises a shell and a nozzle assembly, wherein one end of the nozzle assembly is arranged in the shell, the other end of the nozzle assembly extends out of the shell, the nozzle assembly comprises a plurality of jetting hoses which are sequentially sleeved, and a combined nozzle arranged at the jetting end of the jetting hose, the combined nozzle comprises a plurality of split blocks which are correspondingly connected with the jetting hoses one by one, and the adjacent jetting hoses are limited by shear pins arranged between the split blocks; and a limiting component which is in limiting fit with the outer side pipe when the inner side pipe extends out of the tail end of the outer side pipe is arranged between the adjacent jetting hoses. The invention has the advantages of increased oil drainage area of the reservoir, simple structure, convenient operation and the like.

Description

Perforating device for well completion operation

Technical Field

The invention relates to the field of downhole completion tools, in particular to a perforating device for completion operation.

Background

In oil extraction, it is an important process to open oil flow channels. The existing mode of opening an oil flow channel is to adopt shaped charge perforation, the pollution of a compacted zone generated by a reservoir by adopting the perforation mode cannot be overcome, the effective permeability of the reservoir is greatly reduced, and the method is extremely unfavorable for crude oil production. In order to solve the technical problems, the existing mode is a high-pressure water jet perforation mode which can generate a duct with a certain length. But the communication range of the pore passage is still far from enough, and the jetting rock breaking effect is limited.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the perforating device for well completion operation, which increases the oil drainage area of a reservoir, has a simple structure and is convenient to operate.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a perforating device for well completion operation comprises a shell and a nozzle assembly, wherein one end of the nozzle assembly is arranged in the shell, the other end of the nozzle assembly extends out of the shell, the nozzle assembly comprises a plurality of jetting hoses which are sequentially sleeved, and a combined nozzle which is arranged at the jetting end of the jetting hoses, the combined nozzle comprises a plurality of split blocks which are correspondingly connected with the jetting hoses one by one, and the adjacent jetting hoses are limited by shear pins arranged between the split blocks; and a limiting component which is in limiting fit with the outer side pipe when the inner side pipe extends out of the tail end of the outer side pipe is arranged between the adjacent jetting hoses.

As a further improvement of the above technical solution:

the intensity of the shear pin of the limiting outer side jet hose is smaller than that of the shear pin of the limiting inner side jet hose.

The shear pins for limiting the same injection hose are at least two, and the shear pins are uniformly arranged along the circumferential direction of the injection hose.

The limiting assembly comprises a limiting ring arranged on the outer side of the front end of the injection hose and a matching ring arranged on the inner side of the tail end of the injection hose, and when the inner side pipe extends out of the tail end of the outer side pipe, the limiting ring is in limiting matching with the matching ring.

The combined nozzle is provided with a main jet flow channel and a sub jet flow channel which are communicated with the inner cavity of the injection hose; each injection hose positioned in the outermost injection hose is provided with an overflowing through hole, and the inner cavity of each injection hose is communicated with the sub-jet flow channel through the overflowing through hole.

The total flow area of the flow through holes is larger than the total flow area of the main jet flow channel and the branch jet flow channels.

The main jet flow channel is provided with a plurality of branch jet flow channels, the central lines of the branch jet flow channels are intersected, and the central line of the main jet flow channel is intersected with the intersection point of the branch jet flow channels.

The spraying hose is characterized in that a through hole for the spraying hose to penetrate through is formed in the shell, a sealing seat used for guaranteeing the sealing of an inner cavity of the shell is arranged between the through hole and the spraying hose, and a limiting portion in limiting fit with the sealing seat is arranged at one end of the spraying hose on the outermost side.

A first sealing ring, a sealing ring and a pressing ring are arranged between the sealing seat and the injection hose, the first sealing ring and the sealing ring are sleeved on the injection hose on the outermost side, and the sealing position is adjusted by the pressing ring screwed on the sealing seat; and a second sealing ring is arranged between the sealing seat and the through hole.

The casing includes top connection, lower clutch and connects the shell, connect the both ends of shell respectively with top connection and lower clutch threaded connection, it is equipped with the third sealing washer to connect between shell and top connection and the lower clutch.

Compared with the prior art, the invention has the advantages that:

the nozzle assembly comprises a plurality of injection hoses which are sleeved in sequence, the injection hoses extend out of the reservoir layer step by step under the action of hydraulic traction to drill into the reservoir layer to carry out pore forming, and the pore forming depth is greatly increased, so that the range of the reservoir layer is greatly extended, and the aims of increasing the oil drainage area of the reservoir layer and increasing the yield are fulfilled. The combined nozzle at the injection end of the injection hose comprises a plurality of split blocks, the split blocks are connected with the injection hoses in a one-to-one correspondence manner, adjacent injection hoses are limited through shear pins arranged between the split blocks, and the shear pins are cut off when the two corresponding injection hoses move relatively, so that the injection hoses can extend out step by step. Simultaneously, be equipped with spacing subassembly between the adjacent injection hose, it makes the inboard pipe stretch out to outside pipe when terminal can with the spacing cooperation of outside pipe, has guaranteed the injection hose reliably to stretch out step by step.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

fig. 1 is a schematic structural view of the present invention.

Fig. 2 is an enlarged schematic view of a portion a of fig. 1.

Fig. 3 is an enlarged schematic view of a portion B of fig. 1.

Fig. 4 is a front view of the spray head of the present invention.

Fig. 5 is a front sectional view of the head of the present invention.

Fig. 6 is a top view of the spray head of the present invention.

Fig. 7 is a cross-sectional view of the primary shear pin location of the present invention.

Fig. 8 is a cross-sectional view of a secondary shear pin location of the present invention.

FIG. 9 is a schematic view of the configuration of the present invention with the outer tube fully extended.

Fig. 10 is a schematic view of the structure of the present invention with the intermediate pipe fully extended.

Fig. 11 is a schematic view of the inner tube of the present invention when fully extended.

The reference numerals in the figures denote:

1. a housing; 11. a through hole is penetrated; 12. an upper joint; 13. a lower joint; 14. connecting the shell; 15. a third seal ring; 2. a nozzle assembly; 21. a spray hose; 211. an overcurrent through hole; 212. a limiting part; 22. a combined nozzle; 221. splitting the blocks; 222. a primary fluidic channel; 223. a sub-jet channel; 3. shearing the nails; 31. primary shear pins; 32. secondary shear pins; 33. trimming a nail hole; 4. a limiting component; 41. a limiting ring; 42. matching rings; 5. a sealing seat; 6. a first seal ring; 7. a seal ring; 8. a compression ring; 9. and a second seal ring.

Detailed Description

The invention will be described in further detail with reference to the drawings and specific examples of the description, which should not be construed as limiting the scope of the invention.

In the embodiment of the perforating device for well completion operation shown in fig. 1 to 8, the perforating device for well completion operation is mainly used in the field of well completion stimulation of petroleum carbonate reservoirs. The perforating device for well completion operation comprises a shell 1 and a nozzle assembly 2, wherein one end of the nozzle assembly 2 is arranged in the shell 1; the other end of the nozzle assembly 2 extends out of the housing 1 to jet-port the rock.

In this embodiment, the nozzle assembly 2 includes a spray hose 21 and a combined spray head 22. The plurality of jetting hoses 21 are sequentially sleeved, the jetting hoses 21 extend out of the reservoir layer step by step under the action of hydraulic traction to drill in the reservoir layer to implement pore forming, the pore forming depth is greatly increased, the communication reservoir layer range is greatly extended, and the purposes of increasing the oil drainage area of the reservoir layer and increasing the yield are achieved. The combined spray head 22 is arranged at the spraying end of the spraying hose 21, the combined spray head 22 comprises a plurality of split blocks 221, the split blocks 221 are correspondingly connected with the spraying hoses 21 one by one, the adjacent spraying hoses 21 are limited by shear pins 3 arranged between the split blocks 221, and the shear pins 3 are sheared when the two corresponding spraying hoses 21 move relatively, so that the spraying hoses 21 can extend out step by step, the operation is convenient, the perforating efficiency is high, and the combined form of the split blocks 221 and the shear pins 3 is simple and compact in structure and small in occupied space. Meanwhile, a limiting component 4 is arranged between the adjacent jetting hoses 21, so that the jetting hose 21 positioned on the inner side can be in limiting fit with the jetting hose 21 positioned on the outer side when extending out to the tail end of the jetting hose 21 positioned on the outer side, and the jetting hose 21 is ensured to extend out reliably step by step.

In this embodiment, the strength of the shear pins 3 of the outer side limiting jetting hose 21 is smaller than the strength of the shear pins 3 of the inner side limiting jetting hose 21. The jet hose 21 positioned at the outer side is firstly sheared to generate relative movement during perforation, and the progressive extension of the jet hose 21 is ensured.

As shown in fig. 1 to 3, the number of the injection hoses 21 of the present embodiment is three, and the three injection hoses 21 are respectively an inner layer pipe, a middle layer pipe and an outer layer pipe which are sequentially sleeved; the split blocks 221 are provided in three, and the three split blocks 221 are respectively screwed with the corresponding jetting hoses 21. In other embodiments, two, four, etc. may be provided depending on the injection stroke requirements, with the split blocks 221 being correspondingly provided in two, four, etc. As shown in fig. 6 to 8, the inner and middle tubes of this embodiment are retained by primary shear pins 31 between split blocks 221, and the middle and outer tubes are retained by secondary shear pins 32 between split blocks 221. The strength of the primary shear pin 31 is less than that of the secondary shear pin 32, so that the middle-layer pipe and the inner-layer pipe extend out step by step after the outer-layer pipe extends out in place.

Further, the number of the shear pins 3 for limiting the same injection hose 21 is two, and the two shear pins 3 are symmetrically arranged on two sides of the injection hose 21. In other embodiments, the number of the shear pins 3 is only required to ensure the connection strength and the shearing strength of the injection hose 21, and the shear pins 3 may also be three, four, or the like, and the plurality of shear pins 3 are uniformly arranged along the circumferential direction of the injection hose 21.

As shown in fig. 2 and 3, the stop assembly 4 includes a stop ring 41 and a mating ring 42. The limiting ring 41 is arranged on the outer side of the front end of the jetting hose 21, the matching ring 42 is arranged on the inner side of the tail end of the jetting hose 21, and when the jetting hose 21 on the inner side extends out of the tail end of the jetting hose 21 on the outer side, the limiting ring 41 is in limiting matching with the matching ring 42. The structure is simple and the operation is convenient.

As shown in fig. 5, the combined nozzle 22 of the present embodiment is provided with a main jet passage 222 and a sub-jet passage 223. The main jet flow path 222 and the sub jet flow path 223 communicate with the inner cavity of the injection hose 21. Each jetting hose 21 located in the outermost jetting hose 21 is provided with an overflowing through hole 211, and the inner cavity of the jetting hose 21 is communicated with the sub-jetting channels 223 through the overflowing through hole 211. In this embodiment, the total flow area of the flow through holes 211 is larger than the total flow area of the main jet flow channel 222 and the sub jet flow channels 223, so that a throttling pressure difference is formed at the combined nozzle 22 to pull the injection hose 21 to extend.

Further, the minute fluidic channels 223 are provided in four. The four sub-jet flow passages 223 are uniformly arranged along the circumferential direction of the injection hose 21, and the center lines of the sub-jet flow passages 223 intersect, and the center line of the main jet flow passage 222 intersects the intersection point of the sub-jet flow passages 223. In other embodiments, the number of sub-jet channels 223 can be adjusted according to the perforation flow requirement, such as three or five.

In this embodiment, the combined nozzle 22 is provided with a shear pin hole 33 for the shear pin 3 to pass through. The shear pin openings 33 are arranged offset from the partial jet channels 223 in the circumferential direction of the spray hose 21. In this embodiment, the combination nozzle 22 is a spherical combination nozzle, and in other embodiments, the combination nozzle can be square, cylindrical, etc.

As shown in fig. 2, the housing 1 is provided with a through hole 11 through which the spray hose 21 passes. Be equipped with seal receptacle 5 between through-hole 11 and the injection hose 21, seal receptacle 5 spiro union has guaranteed the effective seal of casing 1 inner chamber in through-hole 11. One end of the outermost jetting hose 21 is provided with a limiting part 212, so that the outermost jetting hose 21 is in limiting fit with the sealing seat 5 when moving to the limiting position. In this embodiment, the through hole 11 is an inclined hole, and the inclined hole is arranged toward the perforation direction.

Further, a first seal ring 6, a seal ring 7 and a clamp ring 8 are arranged between the seal holder 5 and the injection hose 21. The first sealing ring 6 and the sealing ring 7 are sleeved on the spraying hose 21 on the outermost side, so that double sealing between the sealing seat 5 and the spraying hose 21 can be realized; 8 spiro union of clamp ring is in seal receptacle 5, and first sealing washer 6 and sealing ring 7 compress tightly sealedly through clamp ring 8, and simultaneously, the adjustable first sealing washer 6 of the spiro union degree of depth of regulation clamp ring 8 and the sealing position of sealing ring 7, the setting of clamp ring 8 has further improved sealed effect. A second sealing ring 9 is arranged between the sealing seat 5 and the through hole 11 to ensure effective sealing between the sealing seat 5 and the through hole 11.

Further, the housing 1 includes an upper joint 12, a lower joint 13, and a connection housing 14. Wherein, top connection 12 and lower clutch 13 are connected with the well completion tubular column respectively, and casing 1 can be along with the well completion tubular column is gone into to predetermined reservoir, and simultaneously, the through-hole 11 that runs through on the casing 1 is prefabricated hole for can carry out the perforation operation after casing 1 goes into, avoided need from the well head go into injection tool, need punch the complex operation's problem in addition on casing 1, its easy operation, efficient, and the suitability is strong. Both ends of the connection housing 14 are screwed with the upper joint 12 and the lower joint 13, respectively. And a third sealing ring 15 is connected between the outer shell 14 and the upper joint 12 and the lower joint 13 so as to ensure effective sealing isolation of the inner cavity of the shell body 1.

As shown in fig. 9 to 11, in the present embodiment, taking three groups of injection hoses 21 as an example, the process of the perforating device for completion operation is as follows: (1) the perforating device is put into a well along with the well completion pipe column, in the well completion operation, a ball is thrown in the well completion pipe column to plug the inner cavity of the well completion pipe column, acid liquid is continuously pumped in the pipe, the pressure in the pipe is increased, under the action of hydraulic pressure difference, the acid liquid is sprayed out through the combined spray head 22 at the spraying end of the spraying hose 21, and rock pore-forming is realized under the combined action of acid liquid corrosion and hydraulic spraying. Meanwhile, the flow area of the combined nozzle 22 is reduced to form a throttling pressure difference, the jetting hose 21 extends out of the shell 1 under the action of hydraulic traction until the front end of the outermost jetting hose 21 reaches the sealing seat 5 for limiting, and the complete release of the first-stage jetting hose 21 is completed. (2) Pumping is continued after a certain displacement is increased in the pipe, the primary shear pin 31 is sheared after the throttling pressure reaches a certain value, the inner layer pipe and the middle layer pipe of the injection hose 21 continue to extend outwards, and when the limiting ring 41 at the front end of the middle layer pipe and the matching ring 42 at the tail end of the outer layer pipe are limited, the second-stage injection hose 21 is completely released. (3) The displacement is continuously increased in the pipe, when the throttling pressure is continuously increased to a certain pressure, the secondary shear pin 32 is sheared off, the inner pipe is continuously extended outwards, and when the limiting ring 41 at the front end of the inner pipe is limited by the matching ring 42 at the tail end of the middle pipe, the third-stage jet hose 21 is completely released.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A perforating device for well completion operation comprises a shell and a nozzle assembly, wherein one end of the nozzle assembly is arranged in the shell, and the other end of the nozzle assembly extends out of the shell; and a limiting component which is in limiting fit with the outer side pipe when the inner side pipe extends out of the tail end of the outer side pipe is arranged between the adjacent jetting hoses.

2. The perforating device as recited in claim 1 wherein the shear pins of the lateral confining injection hoses have a strength less than the shear pins of the medial confining injection hoses.

3. The perforating device for well completion operation as claimed in claim 2, wherein there are at least two shear pins for limiting the same jetting hose, and a plurality of shear pins are uniformly arranged along the circumference of the jetting hose.

4. A perforating device as claimed in any of the claims 1-3, characterized in that the limiting assembly comprises a limiting ring arranged outside the front end of the jetting hose and a mating ring arranged inside the end of the jetting hose, the limiting ring and the mating ring being in limiting engagement when the inner pipe extends to the end of the outer pipe.

5. The perforating device for the well completion operation as claimed in any one of claims 1 to 3, wherein the combined nozzle is provided with a main jet flow channel and a sub jet flow channel which are communicated with the inner cavity of the injection hose; each injection hose positioned in the outermost injection hose is provided with an overflowing through hole, and the inner cavity of each injection hose is communicated with the sub-jet flow channel through the overflowing through hole.

6. Perforating device for a completion operation according to claim 5, characterized in that the total flow area of the through-flow openings is larger than the total flow area of the main and sub-jet channels.

7. The perforating device for well completion operation as claimed in claim 5, wherein said branch jet flow channel is plural, a center line of each of said branch jet flow channels intersects, and a center line of said main jet flow channel intersects with an intersection point of said branch jet flow channels.

8. The perforating device for the well completion operation as claimed in any one of claims 1 to 3, wherein a through hole for the injection hose to pass through is provided on the housing, a sealing seat for ensuring the sealing of the inner cavity of the housing is provided between the through hole and the injection hose, and a limiting part which is in limiting fit with the sealing seat is provided at one end of the injection hose on the outermost side.

9. The perforating device for the well completion operation as claimed in claim 8, wherein a first sealing ring, a sealing ring and a pressing ring are arranged between the sealing seat and the injection hose, the first sealing ring and the sealing ring are sleeved on the outermost injection hose, and the sealing position is adjusted by the pressing ring screwed on the sealing seat; and a second sealing ring is arranged between the sealing seat and the through hole.

10. The perforating device for the well completion operation as claimed in any one of claims 1 to 3, wherein the housing comprises an upper joint, a lower joint and a connecting shell, both ends of the connecting shell are respectively in threaded connection with the upper joint and the lower joint, and a third sealing ring is arranged between the connecting shell and the upper joint and the lower joint.