CN105507867B - A kind of device and method for generating wellbore crack - Google Patents
A kind of device and method for generating wellbore crack Download PDFInfo
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- CN105507867B CN105507867B CN201410495449.XA CN201410495449A CN105507867B CN 105507867 B CN105507867 B CN 105507867B CN 201410495449 A CN201410495449 A CN 201410495449A CN 105507867 B CN105507867 B CN 105507867B
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Abstract
The present invention relates to a kind of device and method for generating wellbore crack.The device include main pipe, sub- pipe and be arranged sub- pipe the other end for cutting the drilling assembly of ground, mounting hole is set on the side wall of main pipe, the area of passage of sub- pipe is less than the area of passage of main pipe, in the initial state, one end of sub- pipe is arranged in the inner cavity of main pipe, the other end of sub- pipe is inserted into mounting hole, and in pumping liquid process into main pipe, sub- pipe is entered by mounting hole in storage stratum.And liquid is sprayed by the first flowing hole on drilling assembly outward to be shot through rock stratum, while drilling assembly rotation is to cut rock stratum.During petroleum oil well completion, device can select hydraulic parameters to be oriented perforation in different oil reservoirs, crack location and developing direction can be efficiently controlled, to improve oil and gas production.Using this method production wellbores crack, construction cost is low, short construction period.
Description
Technical field
The invention belongs to oil-gas field development technical fields, and in particular to for a kind of device and side for generating wellbore crack
Method.
Background technology
In oil exploitation, it is an important process to generate wellbore crack.But in the prior art, in order to generate wellbore
Crack, frequently with hydraulic jet perforation technology.
In actual application, first with hydraulic perforation, hole is formed in storing stratum.In order to increase storage
Draining, discouraged area, perforation carry out pressure break effect after the completion in stratum.If wider, longer split need to be formed in storing stratum
Seam just needs more extensive fracturing work.But massive hydraulic fracture effect will expend more water resources, time-consuming for constructing operation,
Construction cost is high.Simultaneously because the inhomogeneities of storage reservoir stress, crack generation position may not also be in perforating site.And
As long as storing stratum crack initiation, crack quantity is difficult to increase, even if increasing pump notes scale, liquid is still past along the crack being originally defined
Extend depths.Therefore, crack location and developing direction cannot be guaranteed by hydraulic jet perforation technology, to storing the transformation on stratum
It may cannot get desired effect.
Thus, it is desirable to provide a kind of device and method in generation wellbore crack, the position in wellbore crack can be efficiently controlled
And developing direction, ensure to achieve the desired results to the transformation for storing stratum.
Invention content
For above-mentioned problem, the present invention proposes a kind of device and method for generating wellbore crack.The present invention's
Device can select hydraulic parameters to be oriented perforation in different oil reservoirs, can efficiently control the position in the wellbore crack on storage stratum
It sets and developing direction, the transformation to storing stratum is made to achieve the desired results.And utilize the method in the device production wellbores crack
It is easy to operate so that construction cost is low, short construction period.
According to an aspect of the invention, it is proposed that a kind of device for generating wellbore crack, which is characterized in that including：
Main pipe, the mounting hole being provided through on the side wall of main pipe,
Son pipe, area of passage are less than the area of passage of main pipe, and in the initial state, one end of sub- pipe is arranged in main pipe
In inner cavity, the other end of sub- pipe is inserted into mounting hole, into main pipe pump liquid during, sub- pipe by mounting hole into
Enter to store in stratum,
Drilling assembly in the ground for cutting storage stratum of the other end of sub- pipe is set.
During petroleum oil well completion, this device is mounted on tubing string, then by lower section to after making a reservation for storage stratum, from ground
Towards liquid is pumped in main pipe, since one end of sub- pipe is in the inner cavity of main pipe, then liquid by sub- pipe one end enter and by
The other end of sub- pipe sprays fractured rock, to form hole.Simultaneously as the area of passage of sub- pipe is less than the flow-passing surface of main pipe
Product forms chock pressure difference, to which choke pressure promotor site pipe is extended through the mounting hole of main pipe in hole.Also, due to
The other end of sub- pipe is provided with drilling assembly, and during main pipe stretches into storage stratum, drilling assembly machinable ground helps
Yu Ziguan more smoothly, is more efficiently inserted into storing stratum.Finally, in sub- pipe drilling storage rock stratum, and in storing rock stratum
Form wellbore crack.When this device being used to generate the wellbore crack for storing exploitation runner as a result, pass through the position of mounting hole
It sets, length of sub- pipe etc. just can efficiently control position and the developing direction in wellbore crack, reach the expection of storage stratum transformation
Effect.In operation, consuming liquid is few, and operating cost is low, high to the transformation controllability for storing stratum.
In one embodiment, drilling assembly includes that the core that can be rotated by liquid driven in the inner cavity of sub- pipe is arranged
Axis, and the drill bit of the other end of sub- pipe is fixedly connected with and extended with mandrel, the interior of sub- pipe can be connected to by being provided on drill bit
First flowing hole of chamber.By this set, during sub- pipe stretches into storage stratum, drill bit rotates under mandrel drive, uses
To cut ground.Meanwhile liquid is sprayed by the first flowing hole and is crushed ground, and hole is formed in storing stratum, is used for sub- Guan Shun
It is inserted into rock stratum sharply.And this is simple in structure, is easy to implement.
In one embodiment, mandrel includes the screw rod for having helical form floor, is arranged in the outer end of screw rod for pacifying
The mounting portion of drill bit is filled, and the interconnecting piece being arranged between mounting portion and screw rod.Enable screw rod in liquid by this set
The lower rotation of stream effect, and mounting portion is driven to rotate, to drive drill bit.And this is simple in structure, easy for installation.
In one embodiment, the second flowing hole being connected to the first flowing hole is provided on mounting portion, in interconnecting piece
On be provided with the flow-conveying groove of inner cavity for being connected to the second flowing hole and sub- pipe.By above-mentioned setting, it is connected to the first flowing hole
With the inner cavity of sub- pipe, the liquid from sub- pipe is enable to be sprayed from the first flowing hole to be shot through ground.
In one embodiment, drill bit includes the cone for being configured to its diameter and being gradually reduced by the outside extreme direction in inner end,
The outlet of the outer end of first flowing hole is arranged on the side wall of cone.By this set, cone is being stored with sub- pipe
It is more effectively crept into stratum, meanwhile, spray liquid from the first flowing hole to storage stratum.This is simple and reasonable.
In one embodiment, it is arranged in the outer circumferential of cone and is prolonged to outer extreme direction along inner end by the bottom surface of cone
The brill tooth stretched bores tooth position in the upstream of outlet.By this set, for cone in drilling process, brill tooth spiral is rotatable to cut it
Periphery rock stratum expands hole formation diameter, is conducive to sub- pipe and is more smoothly inserted into storage stratum.The setting of tooth not shadow is bored simultaneously
Liquid is rung to be sprayed from the first flowing hole to storage stratum.
In one embodiment, multiple first flowing holes are set on drill bit, and the outlet of multiple first flowing holes is in taper
It is uniformly distributed on the side wall of body, total area of passage of the outlet of multiple first flowing holes is less than the area of passage of the second flowing hole.
By this set, dispersible formula sprays rock stratum, increases the hole area to be formed.Meanwhile it improving through the first flowing hole
Outlet flow rate of liquid, help faster preferably to form hole.
In one embodiment, mounting hole tilts down in main pipe, and the axis of mounting hole and the axis of main pipe institute
The acute angle of formation is 20~70 °.Preferably, acute angle is 45 °.By this set, sub- pipe is made more easily to be installed in main pipe,
And under choke pressure effect, sub- pipe is easier to extend in storage stratum from mounting hole.
In one embodiment, device further includes the sealing group being arranged between the inner wall and the outer wall of sub- pipe of mounting hole
Part, seal assembly includes the support ring for the outer end for being fixed at mounting hole, be fixed at mounting hole inner end spacing ring,
And the movable elastic sealing element being arranged between spacing ring and support ring, wherein it is provided with pressure transmission hole on spacing ring, so that
Elastic sealing element can be acted on by pressure transmission hole by obtaining liquid.By above-mentioned setting, when logical with a fixed displacement in the inner cavity of main pipe
When crossing liquid, liquid is acted on by pressure transmission hole on elastic sealing element, makes its being radially expanded along mounting hole, to realize sub- pipe
Sealing between mounting hole.Fluid pressure is bigger in main pipe, elastic sealing element be squeezed it is more severe, between sub- pipe and mounting hole
Sealing performance it is higher.And this is simple in structure, is easy to implement.
In one embodiment, multiple mounting holes are being set up the week of main pipe, each mounting hole is both provided with corresponding
Son pipe, drilling assembly and seal assembly.By such setting, multiple wellbore cracks can be formed on a completion tubular column, from
And increase the exploitation effect of storage.Production efficiency is improved simultaneously, has saved production cost.
According to another aspect of the present invention, a kind of method for generating wellbore crack is provided, which is characterized in that including with
Lower step：
Step 1：It will be put into storage stratum precalculated position according to above-mentioned device；
Step 2：Liquid is pumped into main pipe, when the liquid in main pipe is flowed with the first fixed displacement, liquid is by sub- pipe
The other end spray to be shot through rock stratum, and under choke pressure effect, sub- pipe is stretched into storage stratum, meanwhile, drilling group
The ground on part cutting storage stratum；
Step 3：After forming wellbore crack during sub- pipe goes out to be inserted into completely storage stratum, ground termination of pumping；
The method is used to form wellbore crack as a result, it is easy to operate, it is easy for construction.And the well formed using the method
The position of palpebral fissure seam and length are controllable.
In the application, term " inner end " refers to one end close to the inner cavity of main pipe, and term " outer end " refers to the inner cavity far from main pipe
One end.Term "upper" "lower" is using the real work direction of device as reference.
Compared with prior art, the present invention includes following advantages.When generating wellbore crack by this device, can effectively it control
Crack location processed and developing direction enhance the controllability of fracture.The eyelet flaw area and length generated in storing stratum
Degree is big, so as to be effectively increased its area of draining and production capacity.Sub- pipe can be fully inserted into storage stratum, and can be more than that drilling well is polluted
Band avoids wellbore contaminants.The wellbore that generates is with strong points in storage stratum, and casing strength is damaged small, is influenced very on casing strength
It is small, to extend the oil well service life.In addition, the apparatus according to the invention is simple and reasonable, have very high safety and
Reliability.When forming wellbore crack by the method so that it is easy to operate, improve production efficiency.
Description of the drawings
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein：
Fig. 1 shows the device according to the present invention for generating wellbore crack；
Fig. 2 shows the enlarged drawing at the A from Fig. 1；
Fig. 3 shows the stereogram of mandrel.
Attached drawing is not drawn according to actual ratio.
Specific implementation mode
Below in conjunction with attached drawing, the present invention will be further described.
Fig. 1 shows the device 100 according to the present invention for generating wellbore crack.As shown in Figure 1, device 100 includes
Main pipe 1, sub- pipe 2 and the drilling assembly 9 in the outer end of sub- pipe 2 is set.Perforative mounting hole 11 is set on the side wall of main pipe 1.
In the initial state, one end of sub- pipe 2 is arranged in the inner cavity of main pipe 1, and the other end of sub- pipe 2 is inserted into mounting hole 11.And
The drilling assembly 9 in the other end of sub- pipe 2, which is arranged, cannot surmount the peripheral surface of side wall of main pipe 1.It, will during petroleum oil well completion
This device 100 is mounted on tubing string, and then by behind lower section to predetermined storage stratum, liquid is pumped into main pipe 1 from ground.Liquid
Entered by one end of sub- pipe 2 and sprayed by the other end of sub- pipe 2, wellbore is formed to pierce through rock.The area of passage of sub- pipe 2 is less than
The area of passage of main pipe 1 when then main pipe 1 is with a constant flow pump liquor charging body, forms chock pressure difference, under choke pressure promotion, son
Pipe 2 is extended to by main pipe 1 in storage stratum along mounting hole 11.Meanwhile drilling assembly 9 stretches into the mistake on storage stratum in main pipe 1
Cheng Zhong, machinable ground make sub- pipe 2 be inserted into storage stratum and are easier.Finally, sub- pipe 2 stretches into storage rock stratum, and in storage rock
Wellbore crack is formed in layer.
When generating wellbore crack using this device 100, the position and development side of the eyelet on storage stratum can be efficiently controlled
To helping to improve fuel-displaced, gas output.During forming wellbore crack, it is only necessary to which sub- pipe 2 is simultaneously inserted into storage by broken ground
In stratum, without pressure break, more liquid is expended so as to avoid massive hydraulic fracture operation, reduce production cost.Also
Have, it is simple to operate, it is high to the transformation controllability of storage.
As shown in Fig. 2, drilling assembly 9 includes mandrel 91 and the drill bit 92 being fixedly connected with mandrel 91.The setting of mandrel 91 exists
In the inner cavity of sub- pipe 2.And drill bit 92 extends the other end of sub- pipe 2.
As shown in figure 3, mandrel 91 includes the screw rod 912 for having helical form floor 911, it is arranged in the outer end of screw rod 912
Interconnecting piece 914 is fixedly installed in mounting portion 913 for installing drill bit 92 between mounting portion 913 and screw rod 912.In sub- pipe 2
When having liquid flowing, liquid driven floor 911 drives screw rod 912 to rotate, screw rod 912 drive connection portion 914 and mounting portion successively
913 rotations, to drive drill bit 92 to rotate.As a result, in sub- pipe 2 during being inserted into storage stratum, drill bit 92 is in 91 band of mandrel
Dynamic lower rotation, for cutting the ground on storage stratum.
As shown in Fig. 2, mounting cylinder 922 is arranged close to one end of mandrel 91 on drill bit 92.Mounting cylinder 922 is inserted into sub- pipe
In 2, and it is socketed on the outer wall of mounting portion 913.For example, mounting cylinder 922 can be threadedly secured on mounting portion 913.But
It should be noted that the tightening direction of screw thread should be consistent with 91 direction of rotation of the mandrel, to prevent mandrel 91 in rotary course,
Threaded connection at mounting cylinder 922 and mounting portion 913 loosens.Ring type seal 918 is set between mounting cylinder 922 and sub- pipe 2,
For realizing the sealing between mounting cylinder 922 and sub- pipe 2.
As shown in Fig. 2, the first flowing hole 921 of the inner cavity for being connected to sub- pipe 2 is arranged on drill bit 92.It is used to spray outward
Liquid is penetrated, rock stratum is shot through and forms hole.Flow-conveying groove 915 is set on interconnecting piece 914.Setting and flow-conveying groove on mounting portion 913
Second flowing hole 916 of 915 connections.In drill bit 92 close to one end of mounting portion 913 setting flaring 917.Flaring 917 is for repeatedly
Logical second flowing hole 916 and the first flowing hole 921.Liquid in the inner cavity of sub- pipe 2 as a result, can enter the by flow-conveying groove 915
It is spouting by the first flowing hole 921 after flaring 917 in two flowing holes 916.
Drill bit 92 includes cone 923 and the brill tooth 924 in the outer circumferential of cone 923 is arranged.Cone 923 constructs
It is gradually reduced by the outside extreme direction in inner end for its diameter, is used for band mover pipe 2 and pierces in storage stratum.And bore the setting of tooth 924
To be extended to outer extreme direction along inner end by the bottom surface of cone 923.During cone 923 creeps into storage stratum, tooth is bored
924, for rotatably cutting its periphery rock stratum, expand hole formation diameter, are conducive to sub- pipe 2 and are more smoothly inserted into storage stratum
In.Wherein, the first flowing hole 921 is arranged on cone 923, and the outlet of the first flowing hole 921 is arranged in cone 923
Side wall on.The upstream that tooth 924 is located at the outlet of the first flowing hole 921 is bored, for avoiding boring the influence liquid of tooth 924 by the first mistake
Discharge orifice 921 is sprayed to storage stratum.
Preferably, multiple first flowing holes 921 can be set on drill bit 92.It is boring the outlet of multiple first flowing holes 921
It is uniformly distributed on the side wall of shape body 923.921 dispersible formula of multiple first flowing holes sprays rock stratum, increases to the coverage of rock stratum
Greatly, to increase the hole area to be formed.And total area of passage of the outlet of multiple first flowing holes 921 is less than the second mistake
The area of passage of discharge orifice 916.To, improve the flow rate of liquid of the outlet by the first flowing hole 921, contribute to it is faster more
Wellbore crack is formed in storing stratum well.
As shown in Figure 1, mounting hole 11 tilts down in main pipe 1, and the axis institute of the axis of mounting hole 11 and main pipe 1
The acute angle of formation is 20~70 °.Preferably, acute angle is 45 °.To which sub- pipe 2 can be more easily installed in main pipe 1, and
Under choke pressure effect, sub- pipe 2 is easier to extend in storage stratum from mounting hole 11.
As shown in Figure 1, device 100 further includes the seal assembly 3 being arranged between mounting hole 11 and sub- pipe 2.Such as Fig. 2 institutes
Show, seal assembly 3 includes the support ring 7 for the outer end for being fixed at mounting hole 11, is fixed at the inner end of mounting hole 11
Spacing ring 4 and the movable elastic sealing element 6 being arranged between spacing ring 4 and support ring 7.Wherein, it is arranged on spacing ring 4
There is pressure transmission hole 41, so that the liquid in the inner cavity of main pipe 1 can act on elastic sealing element 6 by pressure transmission hole 41.To make
Elastic sealing element 6 is radially expanded along mounting hole 11, realizes the sealing between sub- pipe 2 and mounting hole 11.When liquid pressure in main pipe 1
When power is bigger, elastic sealing element 6 is squeezed more severe, and the sealing performance between sub- pipe 2 and mounting hole 11 is higher.
Preferably, mounting hole 11 can be configured to threaded hole.Correspondingly, support ring 7 has cricoid first part 71 and ring
The outer diameter of the second part 72 of shape, second part 72 is smaller than the outer diameter of first part 71, and is set on the outer wall of second part 72
It is equipped with and the matched screw thread of the screw thread of mounting hole 11.Spacing ring 4 is configured to cylindrical body, and construction and installation on its external wall simultaneously
The matched screw thread of screw thread in hole 11.Mounting groove 12 can be set on the outer wall of main pipe 1 at mounting hole 11.The bottom surface of mounting groove 12
It can be perpendicular to the axis direction of mounting hole 11.As a result, during the installation process, the second part 72 of support ring 7 is screwed in mounting hole
On 11 inner wall, and the inner face of first part 71 is contacted with the bottom surface of mounting groove 12, for being positioned for support ring 7.In addition,
Spacing ring 4 can be also conveniently mounted on the inner wall of mounting hole 11.And this is simple in structure, is easy to implement.
In one embodiment, pressure ring 5 is fixedly installed in the inner face of elastic sealing element 6, pressure ring 5 is outer with spacing ring 4
End face is closed on.For example, elastic sealing element 6 is rubber ring, and it is integrated with pressure ring 5.Pressure ring 5 receives from pressure transmission hole 41
The thrust of liquid avoids highly pressurised liquid from acting directly on the inner face of elastic sealing element 6, to protect elastic sealing element 6.
And this is simple in structure, and manufacture is facilitated to produce.
Multiple pressure transmission holes 41 can set up the week of spacing ring 4, and pressure transmission hole 41 is uniform in the circumferential direction of spacing ring 4
Distribution.So that the power acted on elastic sealing element 6 is uniform, sealing effect is helped to improve.For example, in the circumferential direction of spacing ring 4
6 pressure transmission holes 41 of upper setting.And for convenience of fabricating, pressure transmission hole 41 can be the circular hole on the wall of spacing ring 4.
The outer wall of elastic sealing element 6 is set as having at least one cambered surface 61 projected radially outwardly along mounting hole 11.
For example, the outer wall of elastic sealing element 6 is set as tool, there are four cambered surfaces 61.Thus when 6 stress deformation of elastic sealing element expands, bullet
Property sealing element 6 be easier deform, in the top end of cambered surface 61 to realize the more favorable sealing between sub- pipe 2 and mounting hole 11.
Simultaneously because the outer wall of elastic sealing element 6 is provided with multiple cambered surfaces 61, such as four, to can reach multi-sealed effect.
For the sealing for realizing between mounting hole 11 and support ring 7, in the outer wall and mounting hole of the second part 72 of support ring 7
Sealing ring 8 is set between 11 inner wall.For example, sealing ring 8 can be O-shaped silica gel sealing ring.
Preferably, sub- pipe 2 can be flexible steel pipe material, be contained in the inner cavity of main pipe 1 with enabling 2 bending of sub- pipe, from
And ensure that sufficiently long sub- pipe 2 can be accommodated in the inner cavity of main pipe 1, to ensure the length of the hole of the formation of sub- pipe 2.For example, can incite somebody to action
The sub- pipe 2 of 9m is placed in the inner cavity of main pipe 1.Meanwhile flexible steel pipe material can make sub- pipe 2 more easily pass the rock for storing stratum
Soil layer.
As shown in Figure 1, multiple mounting holes 11 can be arranged in the circumferential direction of main pipe 1.And each mounting hole 11 be both provided with
Its corresponding sub- pipe 2, drilling assembly 9 and seal assembly 3.And the inner cavity of main pipe 1 may be configured as that multiple sub- pipes 2 can be accommodated, and just
In installing sub- pipe 2, for example, reaming 13 can be arranged in the inner cavity of main pipe 1 at the position for accommodating sub- pipe 2, to increase the inner cavity of main pipe 1
Capacity.Multiple storage exploitation runners can be formed on a completion tubular column as a result, to increase the exploitation effect of storage.
Production efficiency is improved simultaneously, has saved production cost.Such as can 4 installations be set in the main pipe 1 according to Practical Project
Hole 11.
It can be threaded structure at the both ends of device 100, in Completion Operations, easily connecting with completion tubular column
It connects.
The method that 100 production wellbores crack of use device is described in detail below according to Fig. 1 to 3：
First, device 100 is connect with completion tubular column, and is put into storage stratum precalculated position.Then, ground to
Liquid is pumped in main pipe 1.When liquid in main pipe 1 is flowed with the first fixed displacement, the liquid in sub- pipe 2 passes sequentially through flow-conveying groove
915, it after the second flowing hole 916, flaring 917, is ejected by the first flowing hole 921, hole is formed to be shot through rock stratum.Exist simultaneously
Under choke pressure effect, sub- pipe 2 is stretched by mounting hole 11 into rock stratum.Also, the liquid-driving mandrel 91 flowed in sub- pipe 2
It rotates and drill bit 92 is driven to rotate, to cut ground near hole, to form the hole of bigger area of section.Finally, group
Pipe 2 is completely inserted into storage rock stratum, when forming wellbore crack, ground termination of pumping.Main pipe 1 can also propose ground, in case using again.
At application this device 100 generation wellbore crack, wellbore crack can be efficiently controlled by the position of mounting hole 11
Position, the developing direction of hole can be effectively controlled by the length of 11 inclined direction of mounting hole and sub- pipe 2, is enhanced as a result,
To the controllability in wellbore crack.Since sub- pipe 2 creeps into extension while in storing stratum in perforation, uses this device 100 as a result,
The hole area and length generated in storing rock stratum is big, so as to be effectively increased draining gas area and production capacity.Sub- pipe 2 can be completely
It is inserted into storage stratum, and can be more than drilling damage zone, avoids wellbore contaminants.The hole generated in storage stratum is with strong points,
Casing strength be damaged it is small, on casing strength influence very little, to extend the oil well service life.And in operation, expend liquid
Body is few, and operating cost is low.In addition, the apparatus according to the invention 100 is simple and reasonable, with very high safety and reliably
Property.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, various improvement can be carried out to it and can replace component therein with equivalent.The invention is not limited in Wen Zhonggong
The specific embodiment opened, but include all technical solutions fallen within the scope of the appended claims.
Claims (8)
1. a kind of device for generating wellbore crack, which is characterized in that including：
Main pipe, the mounting hole being provided through on the side wall of the main pipe,
Son pipe, area of passage are less than the area of passage of the main pipe, and in the initial state, one end of the sub- pipe is arranged in institute
In the inner cavity for stating main pipe, the other end of the sub- pipe is inserted into the mounting hole, in the mistake for pumping liquid into the main pipe
Cheng Zhong, the sub- pipe are entered by the mounting hole in storage stratum,
Drilling assembly in the ground for cutting storage stratum of the other end of the sub- pipe is set；
The drilling assembly include the mandrel that can be rotated by liquid driven in the inner cavity of sub- pipe is set, and with the mandrel
It is fixedly connected with and is extended the drill bit of the other end of the sub- pipe, the inner cavity that can be connected to the sub- pipe is provided on the drill bit
The first flowing hole；
The mandrel includes the screw rod with helical form floor, is arranged in the outer end of the screw rod for installing the drill bit
Mounting portion, and the interconnecting piece that is arranged between the mounting portion and the screw rod；Be provided on the mounting portion with it is described
Second flowing hole of the first flowing hole connection, is provided on the interconnecting piece for being connected to second flowing hole and the son
The flow-conveying groove of the inner cavity of pipe；The flow-conveying groove is axially extending along the interconnecting piece；
Flaring is set close to one end of mounting portion in drill bit；Flaring is for being connected to the second flowing hole and the first flowing hole；Sub- pipe
Liquid in inner cavity is entered by flow-conveying groove in the second flowing hole, spouting by the first flowing hole after flaring.
2. the apparatus according to claim 1, which is characterized in that the drill bit includes being configured to its diameter by inner end outward
The outlet of the cone that direction is gradually reduced, the outer end of first flowing hole is arranged on the side wall of the cone.
3. the apparatus of claim 2, which is characterized in that be arranged by the taper in the outer circumferential of the cone
The brill tooth that the bottom surface of body extends along inner end to outer extreme direction, the brill tooth position is in the upstream of the outlet.
4. the apparatus of claim 2, which is characterized in that multiple first flowing holes are set on the drill bit,
The outlet of multiple first flowing holes is uniformly distributed on the side wall of the cone, the outlet of multiple first flowing holes
Total area of passage be less than second flowing hole area of passage.
5. the apparatus according to claim 1, which is characterized in that the mounting hole tilts down in the main pipe, and
It is 20~70 ° that the axis of the mounting hole and the axis of the main pipe, which are formed by acute angle,.
6. the apparatus according to claim 1, which is characterized in that further include inner wall and the son being arranged in the mounting hole
Seal assembly between the outer wall of pipe, the seal assembly include the support ring for the outer end for being fixed at the mounting hole, consolidate
It is fixed be arranged the inner end of the mounting hole spacing ring and movable be arranged between the spacing ring and the support ring
Elastic sealing element, wherein pressure transmission hole is provided on the spacing ring, so that liquid can act on institute by the pressure transmission hole
State elastic sealing element.
7. device according to claim 6, which is characterized in that setting up multiple installations the week of the main pipe
Hole, each mounting hole are both provided with the corresponding sub- pipe, the drilling assembly and the seal assembly.
8. a kind of method for generating wellbore crack, which is characterized in that include the following steps：
Step 1：Device according to any one of claim 1 to 7 is put into storage stratum precalculated position；
Step 2：Liquid is pumped into the main pipe, when the liquid in the main pipe is flowed with the first fixed displacement, liquid is by institute
The other end for stating sub- pipe is sprayed to be shot through rock stratum, and under choke pressure effect, and sub- pipe is stretched into storage stratum, meanwhile,
The ground on the drilling assembly cutting storage stratum；
Step 3：After forming wellbore crack during the sub- pipe goes out to be inserted into completely storage stratum, ground termination of pumping.
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| CN201410495449.XA CN105507867B (en) | 2014-09-24 | 2014-09-24 | A kind of device and method for generating wellbore crack |
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| CN201410495449.XA CN105507867B (en) | 2014-09-24 | 2014-09-24 | A kind of device and method for generating wellbore crack |
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| CN105507867B true CN105507867B (en) | 2018-07-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108049857A (en) * | 2017-11-22 | 2018-05-18 | 中国石油集团长城钻探工程有限公司 | A kind of completion volume increase tubing string and its application method |
| CN110878686A (en) * | 2018-09-06 | 2020-03-13 | 中国石油化工股份有限公司 | Fracturing method for oil and gas well |
| CN110878683B (en) * | 2018-09-06 | 2022-07-22 | 中国石油化工股份有限公司 | Device and method for removing near-well pollution of oil and gas well |
| CN110805401A (en) * | 2019-10-29 | 2020-02-18 | 中国石油化工股份有限公司 | High-pressure jet flow sleeve milling pipe bundle for underground operation |
| CN113445977B (en) * | 2020-03-27 | 2023-03-21 | 中国石油化工股份有限公司 | Production increasing pup joint, pipe string and well completion method |
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| CN101960086A (en) * | 2008-03-06 | 2011-01-26 | R·弗里耶 | A method and device for making lateral openings out of a wellbore |
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| CN203188963U (en) * | 2013-04-01 | 2013-09-11 | 中国海洋石油总公司 | In-pipe packer for oil drivepipe leakproofness detection |
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| US8640781B2 (en) * | 2011-02-03 | 2014-02-04 | Fishbones AS | Method and device for deploying a cable and an apparatus in the ground |
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| CN101529848A (en) * | 2006-06-16 | 2009-09-09 | 液滴技术有限公司 | System, method and apparatus of video processing and applications |
| CN101960086A (en) * | 2008-03-06 | 2011-01-26 | R·弗里耶 | A method and device for making lateral openings out of a wellbore |
| CN102031931A (en) * | 2010-11-23 | 2011-04-27 | 中矿瑞杰(北京)科技有限公司 | Self-rotating jet drilling device |
| CN202690004U (en) * | 2012-07-20 | 2013-01-23 | 中国石油化工股份有限公司 | Sealing device for forming sand blasting holes of horizontal well by using continuous oil pipe |
| CN203188963U (en) * | 2013-04-01 | 2013-09-11 | 中国海洋石油总公司 | In-pipe packer for oil drivepipe leakproofness detection |
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