CN108019158A - Fluid pressure type back-off sub - Google Patents
Fluid pressure type back-off sub Download PDFInfo
- Publication number
- CN108019158A CN108019158A CN201610972088.2A CN201610972088A CN108019158A CN 108019158 A CN108019158 A CN 108019158A CN 201610972088 A CN201610972088 A CN 201610972088A CN 108019158 A CN108019158 A CN 108019158A
- Authority
- CN
- China
- Prior art keywords
- inner cylinder
- anchor tip
- closing piece
- outer barrel
- plunger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/021—Devices for subsurface connecting or disconnecting by rotation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
Abstract
The present invention relates to oilfield drilling and production technology field, more particularly to a kind of fluid pressure type back-off sub, including top connection, anchor tip, plunger, outer barrel, closing piece, position-limited claw, inner cylinder, shear pin, lower contact；The top connection is threadedly coupled with the anchor tip, the plunger is arranged on the inside of the anchor tip and is slidably matched with it, the outer sleeve is in the outside of the anchor tip, the closing piece is respectively equipped with the ratchet of mutual cooperation with the anchor tip relevant position, the top of the position-limited claw is placed between the closing piece and the outer barrel, the lower part of the position-limited claw is connected with the lower thread of the inner cylinder, the top of the inner cylinder and the lower part of the plunger coordinate, the lower part of the inner cylinder is connected by the shear pin with the lower contact, the lower contact is connected with the lower thread of the outer barrel.It is simple in present apparatus structure, the destabilizing factor for avoiding labyrinth from bringing, while assemble simply, safe and convenient is cost-effective.
Description
Technical field
The present invention relates to oilfield drilling and production technology field, more particularly to a kind of fluid pressure type back-off sub.
Background technology
In order to improve oil, gas recovery ratio, domestic and international oil field more and more uses the drilling mode of horizontal well, and in level
In the completion mode of well, many wells select horizontal well in segments acid fracturing barefoot completion mode again, are implementing acid fracturing volume increase
In work progress, fluid pressure type back-off sub assume responsibility for by staged fracturing tool pipe string be sent into well and instrument complete it is setting after give up
Task.Therefore whether the performance direct relation acid fracturing volume increase construction of fluid pressure type back-off sub can smoothly complete.By
It was verified that fluid pressure type back-off sub is extremely important instrument in staged fracturing tool, and one of highest instrument of risk,
These risks be mainly derived from operation principle, structure design and the scene of instrument in itself give up operation etc..
At present, the mode of giving up for the fluid pressure type back-off sub that in the market uses mainly has hydraulic releasing, reversion give up, rotate forward
Give up.These fluid pressure type back-off subs are complicated, and assembling difficulty is big, execute-in-place difficulty is big, follow-up tieback, pressure break risk
Greatly, it is necessary to which the unreliable factors such as the instrument for having special anti-upper top coordinates are many, larger risk is brought to construction.Hydraulic fluid
Pressure type back-off sub is complicated, of high cost, assembling difficulty is big, and pressure, the control of lower tool velocity are required in the construction process
Height, may cause to give up in advance, and risk is high.
The content of the invention
It is an object of the invention to overcome the shortcomings of above-mentioned technology, and a kind of fluid pressure type back-off sub is provided, it is simple in structure,
Securely and reliably.
The present invention to achieve the above object, using following technical scheme：A kind of fluid pressure type back-off sub, it is characterised in that：
Including top connection, anchor tip, plunger, outer barrel, closing piece, position-limited claw, inner cylinder, shear pin, lower contact；The top connection with it is described solid
Determine joint screw thread connection, the plunger is arranged on the inside of the anchor tip and is slidably matched with it, and the outer sleeve is in institute
The outside of anchor tip is stated, the closing piece is respectively equipped with the ratchet of mutual cooperation, the limit with the anchor tip relevant position
The top of position pawl is placed between the closing piece and the outer barrel, the top of position-limited claw and the top of closing piece respectively with the outer barrel
The limiting stand of inner side coordinates, and the lower part of the position-limited claw is connected with the lower thread of the inner cylinder, the top of the inner cylinder and institute
The lower part for stating plunger coordinates, and the lower part of the inner cylinder is connected by the shear pin with the lower contact, the lower contact with it is described
The lower thread connection of outer barrel.
Preferably, the thickness of the closing piece is identical with the thickness of the limiting stand on the inside of the outer barrel.
The beneficial effects of the invention are as follows:It is simple in present apparatus structure relative to the prior art, avoid what labyrinth was brought
Destabilizing factor, while assemble simply, safe and convenient is cost-effective；Fluid pressure type, which is given up, can transmit large torque, simple in structure, easily
In maintenance, position-limited claw design, reduces unexpected give up.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is the separate state diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and the preferred embodiment embodiment that the present invention will be described in detail.As depicted in figs. 1 and 2,
A kind of fluid pressure type back-off sub, including top connection 1, anchor tip 2, plunger 3, outer barrel 4, closing piece 5, position-limited claw 6, inner cylinder 7, shear pin
8th, lower contact 9；The top connection is threadedly coupled with the anchor tip, and the plunger is arranged on the inside of the anchor tip simultaneously
It is slidably matched with it, the outer sleeve is in the outside of the anchor tip, the closing piece and the anchor tip relevant position point
The ratchet that She You do not cooperate, the top of the position-limited claw are placed between the closing piece and the outer barrel, the top of position-limited claw
And the top of closing piece coordinates with the limiting stand on the inside of the outer barrel respectively, the lower part of the position-limited claw and the lower part of the inner cylinder
Be threadedly coupled, the lower part of the top of the inner cylinder and the plunger coordinates, the lower part of the inner cylinder by the shear pin with it is described
Lower contact connects, and the lower contact is connected with the lower thread of the outer barrel.On the inside of the thickness of the closing piece and the outer barrel
The thickness of limiting stand is identical.When gear needs separation, steel ball is put into, sphere is moved down with the sealing of plunger 3, and plunger 3 is promoted under inner cylinder 7
Move, cut pin 8, inner cylinder 7 drives position-limited claw 6 to move down, and closing piece 5 is outer after the limitation of position-limited claw is lost to be moved, and is not connect with fixation
It is ratcheting.Connector 1 is put on in this way, so that upper lower contact separation, realizes hydraulic releasing.
It is simple in present apparatus structure, the destabilizing factor for avoiding labyrinth from bringing, while simple, safe and convenient is assembled,
It is cost-effective；Fluid pressure type, which is given up, can transmit large torque, simple in structure, be easy to maintain, and position-limited claw design, reduces unexpected give up.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
- A kind of 1. fluid pressure type back-off sub, it is characterised in that：Including top connection, anchor tip, plunger, outer barrel, closing piece, spacing Pawl, inner cylinder, shear pin, lower contact；The top connection is threadedly coupled with the anchor tip, and the plunger is arranged on the fixation and connects The inside of head is simultaneously slidably matched with it, and the outer sleeve is in the outside of the anchor tip, the closing piece and the anchor tip Relevant position is respectively equipped with the ratchet of mutual cooperation, and the top of the position-limited claw is placed between the closing piece and the outer barrel, limit Position pawl top and closing piece top respectively with the inside of the outer barrel limiting stand coordinate, the lower part of the position-limited claw with it is described The lower thread connection of inner cylinder, the lower part of the top of the inner cylinder and the plunger coordinate, and the lower part of the inner cylinder passes through described Shear pin is connected with the lower contact, and the lower contact is connected with the lower thread of the outer barrel.
- 2. fluid pressure type back-off sub according to claim 1, it is characterised in that：In the thickness of the closing piece and the outer barrel The thickness of the limiting stand of side is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610972088.2A CN108019158A (en) | 2016-11-04 | 2016-11-04 | Fluid pressure type back-off sub |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610972088.2A CN108019158A (en) | 2016-11-04 | 2016-11-04 | Fluid pressure type back-off sub |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108019158A true CN108019158A (en) | 2018-05-11 |
Family
ID=62084706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610972088.2A Pending CN108019158A (en) | 2016-11-04 | 2016-11-04 | Fluid pressure type back-off sub |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108019158A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111119771A (en) * | 2018-11-01 | 2020-05-08 | 中国石油化工股份有限公司 | Releasing device and drilling string comprising same |
| CN111894478A (en) * | 2020-07-09 | 2020-11-06 | 宝鸡畅油石油设备有限公司 | RD type safety joint |
-
2016
- 2016-11-04 CN CN201610972088.2A patent/CN108019158A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111119771A (en) * | 2018-11-01 | 2020-05-08 | 中国石油化工股份有限公司 | Releasing device and drilling string comprising same |
| CN111119771B (en) * | 2018-11-01 | 2022-03-04 | 中国石油化工股份有限公司 | Releasing device and drilling string comprising same |
| CN111894478A (en) * | 2020-07-09 | 2020-11-06 | 宝鸡畅油石油设备有限公司 | RD type safety joint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180511 |
|
| WD01 | Invention patent application deemed withdrawn after publication |