CN201598987U - Positive constant-pressure blocking casing guide shoe - Google Patents
Positive constant-pressure blocking casing guide shoe Download PDFInfo
- Publication number
- CN201598987U CN201598987U CN2010201135145U CN201020113514U CN201598987U CN 201598987 U CN201598987 U CN 201598987U CN 2010201135145 U CN2010201135145 U CN 2010201135145U CN 201020113514 U CN201020113514 U CN 201020113514U CN 201598987 U CN201598987 U CN 201598987U
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- China
- Prior art keywords
- guide shoe
- shoe body
- guide
- stopped
- casing
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Abstract
A positive constant-pressure blocking casing guide shoe comprises a guide shoe body with a cavity inside, and is characterized in that the upper end of the guide shoe body is connected with an upper joint, a press cap is inserted into a lower port of the upper joint and fixed through a set screw disposed on the upper joint, and guide holes are respectively arranged on the wall of the guide shoe body corresponding to a position below the press cap and the lower end of the guide shoe body. The positive constant-pressure blocking casing guide shoe mounted at the bottommost end of a casing string has effects of a valve and a guiding function when downwards lowered into casings, effectively prevents down-hole fluid spraying out from the casing string, reduces well control risks of lowering the casings down into an under-balance completed well, realizes safely lowering the casings on snubbing conditions, is simple in operation, convenient in use and strong in operability, can increase underbalance drilling and completing effectiveness, and is low in construction cost and well control risk and high in safety.
Description
Technical field
The utility model relates to and adopts not kill-job to remove the special tool that pipe string technical security is lowered to sleeve pipe in a kind of insufficient balance well completion operation process, and particularly a kind of forward level pressure is stopped up casing guide.
Background technology
Be lowered in the sleeve pipe operation process at insufficient balance well completion, because bottom pressure is less than strata pressure, formation fluid can constantly flow to pit shaft.If strata pressure is bigger, will be by the well head of gushing out in the bunch tube, the lighter can make the well head operation very inconvenient, and the increase sleeve pipe is lowered to the well control risk in the process; Weight person can cause well control out of control, causes serious consequence.If be lowered to sleeve pipe again after adopting the heavy sizing kill-job, the under balance pressure drilling in early stage has just lost meaning so.
The tradition insufficient balance well completion is lowered to the sleeve pipe operation, depends on casing valve packing pit shaft, perhaps adopts insulating liquid packing oil-gas Layer and top well killing fluid to realize, causes the insufficient balance well completion cost to occupy Gao Buxiao, and the large tracts of land that has seriously restricted under-balanced drilling technology is promoted.
The utility model content
The technical problems to be solved in the utility model provides a kind of insufficient balance well completion of can finishing and is lowered to the sleeve pipe operation, and the forward level pressure workable, that construction cost is low, the well control risk is little is stopped up casing guide.
Technical solution of the present utility model is: the guide shoe body of establishing cavity in it comprises, its special character is: be connected with top connection in guide shoe body upper end, lower port in top connection is fitted with pressure cap, pressure cap is fixed by the holding screw that is located in the top connection, is respectively equipped with the pod apertures that communicates with its inner chamber with guide shoe body lower end below corresponding pressure cap on the guide shoe body wall.
Above-mentioned forward level pressure is stopped up casing guide, and corresponding holding screw place is provided with the shearing blind hole on the pressure cap outer wall, and described holding screw bottom is inserted into shears in the blind hole.
Above-mentioned forward level pressure is stopped up casing guide, be provided with in the pressure cap lower end annular snap along and by annular snap along the lower surface that pressure cap is stuck in top connection, to improve the bearing capacity of pressure cap.
Above-mentioned forward level pressure is stopped up casing guide, is provided with sealing ring between pressure cap and top connection, to strengthen the sealing effectiveness of pressure cap and top connection.
Above-mentioned forward level pressure is stopped up casing guide, and the lower end of described guide shoe body is round end and is evenly equipped with guide vane at the round end external surface, to improve guide effect, makes sleeve pipe precalculated position in the well smoothly.
Above-mentioned forward level pressure is stopped up casing guide, the pod apertures that is located at guide shoe body lower end be a plurality of and lay respectively at center, guide shoe body lower end and the round end wall on, to reduce to be lowered to the fluid resistance in the sleeve pipe process.
This forward level pressure is stopped up casing guide and is installed on bunch tube bottom, in being lowered to the sleeve pipe process, can play the effect of the effect and the guiding of valve, prevent that effectively downhole fluid from spraying in bunch tube, the reduction insufficient balance well completion is lowered to the well control risk in the sleeve pipe operation process, is implemented in and is lowered to sleeve pipe under the not kill-job condition safely; And simple to operate, easy to use, workable, can improve underbalance and bore the completion timeliness, construction cost is low, the well control risk is little, security performance is high.
Description of drawings
Fig. 1 is the structural representation of the utility model master piece;
Fig. 2 is the right view of Fig. 1.
Among the figure: guide shoe body 1, top connection 2, sealing ring 3, pressure cap 4, holding screw 5 is sheared blind hole 6, and annular snap is along 7, pod apertures 8, pod apertures 9, pod apertures 10, guide vane 11.
The specific embodiment
As shown in the figure, this forward level pressure is stopped up casing guide the guide shoe body 1 of establishing cavity in one, guide shoe body 1 upper port is by the tubulose top connection 2 that has been threaded, in the upper port of top connection 2, be processed with internal thread, in the lower port of top connection 2, be fitted with pressure cap 4, be provided with shearing blind hole 6 at pressure cap 4 outer walls, pressure cap 4 is by being located in the top connection 2 and inserting the holding screw 5 of shearing blind hole 6 and fix.Be provided with annular snap along 7 in pressure cap 4 lower ends, along 7 pressure cap 4 be stuck in the lower surface of top connection 2, to improve the bearing capacity of pressure cap 4 by annular snap.Between pressure cap 4 tops and top connection 2, be arranged with sealing ring 3, to strengthen the sealing effectiveness of pressure cap 4 and top connection 2.Below corresponding pressure cap 4 on guide shoe body 1 wall, be provided with a plurality of pod apertures 8, be provided with pod apertures 9 at center, guide shoe body 1 lower end, the lower end of described guide shoe body 1 is round end and is evenly equipped with guide vane 11 at the round end external surface, on the round end wall of guide shoe body 1 lower end, be evenly equipped with pod apertures 10, described pod apertures 8,9,10 all communicates with guide shoe body 1 inner chamber, to reduce to be lowered to the fluid resistance in the bunch tube process.
During use, this forward level pressure is stopped up casing guide be installed in bunch tube bottom by screw thread, before going into well, at first to carry out pressure testing and Leakage Test, guaranteeing to go into well after qualified, after bunch tube is lowered to the precalculated position, suppress in sleeve pipe from bunch tube is suitable for reading, make pressure cap 4 cut off holding screw 5 by building the pressure, holding screw 5 is cut off rear pressing cap 4, just can realize being communicated with of bunch tube and annular space reservoir by pod apertures 8,9,10.
Claims (6)
1. a forward level pressure is stopped up casing guide, establish the guide shoe body of cavity in comprising, it is characterized in that: be connected with top connection in guide shoe body upper end, lower port in top connection is fitted with pressure cap, pressure cap is fixed by the holding screw that is located in the top connection, is respectively equipped with the pod apertures that communicates with its inner chamber with guide shoe body lower end below corresponding pressure cap on the guide shoe body wall.
2. forward level pressure according to claim 1 is stopped up casing guide, and it is characterized in that: corresponding holding screw place is provided with the shearing blind hole on the pressure cap outer wall, and described holding screw bottom is inserted into shears in the blind hole.
3. forward level pressure according to claim 1 is stopped up casing guide, it is characterized in that: be provided with in the pressure cap lower end annular snap along and by annular snap along the lower surface that pressure cap is stuck in top connection.
4. forward level pressure according to claim 1 is stopped up casing guide, it is characterized in that: be provided with sealing ring between pressure cap and top connection.
5. forward level pressure according to claim 1 is stopped up casing guide, it is characterized in that: the lower end of described guide shoe body is round end and is evenly equipped with guide vane at the round end external surface.
6. forward level pressure according to claim 5 is stopped up casing guide, it is characterized in that: the pod apertures that is located at guide shoe body lower end be a plurality of and lay respectively at center, guide shoe body lower end and the round end wall on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201135145U CN201598987U (en) | 2010-02-12 | 2010-02-12 | Positive constant-pressure blocking casing guide shoe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201135145U CN201598987U (en) | 2010-02-12 | 2010-02-12 | Positive constant-pressure blocking casing guide shoe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201598987U true CN201598987U (en) | 2010-10-06 |
Family
ID=42810041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201135145U Expired - Fee Related CN201598987U (en) | 2010-02-12 | 2010-02-12 | Positive constant-pressure blocking casing guide shoe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201598987U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278080A (en) * | 2011-08-17 | 2011-12-14 | 四川蓉瑞华宝科技有限公司 | Hydraulically-operated rotary casing guide shoe |
| CN102392610A (en) * | 2011-12-01 | 2012-03-28 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Design method of sleeve eccentric guide shoe |
| CN104373059A (en) * | 2014-11-10 | 2015-02-25 | 中国石油天然气集团公司 | Floating guide shoe |
-
2010
- 2010-02-12 CN CN2010201135145U patent/CN201598987U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278080A (en) * | 2011-08-17 | 2011-12-14 | 四川蓉瑞华宝科技有限公司 | Hydraulically-operated rotary casing guide shoe |
| CN102278080B (en) * | 2011-08-17 | 2013-05-22 | 四川蓉瑞华宝科技有限公司 | Hydraulically-operated rotary casing guide shoe |
| CN102392610A (en) * | 2011-12-01 | 2012-03-28 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Design method of sleeve eccentric guide shoe |
| CN104373059A (en) * | 2014-11-10 | 2015-02-25 | 中国石油天然气集团公司 | Floating guide shoe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101006 Termination date: 20110212 |