CN204782824U - Directional screw rod centralizer - Google Patents
Directional screw rod centralizer Download PDFInfo
- Publication number
- CN204782824U CN204782824U CN201520411605.XU CN201520411605U CN204782824U CN 204782824 U CN204782824 U CN 204782824U CN 201520411605 U CN201520411605 U CN 201520411605U CN 204782824 U CN204782824 U CN 204782824U
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- CN
- China
- Prior art keywords
- well
- ball
- screw rod
- wiper
- directional
- Prior art date
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- Expired - Fee Related
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Abstract
The utility model relates to a directional screw rod centralizer, including the transmission shaft, the transmission shaft is provided with the piece of rightting of its axially extended straight arris form of two edges on the outer wall that is close to the low limit of well, and two all are provided with the ball groove on rightting a surface, and the ball inslot inlays and is equipped with the ball, and two right chamber that piece and well low limit constitute says the formation guiding gutter. The utility model discloses two set upright or straight an upper portion and the high limit of well has a great annular space, two sets upright or straight chamber that piece and well low limit constitute and says and form the guiding gutter simultaneously, can in time drive the detritus, avoids near the detritus of highly deviated well eyebolt centralizer to pile up, effectively alleviates the backing pressure, improves directional deflecting effect, right the ball inslot that sets up on the surface and inlay and be equipped with the ball, can change the sliding friction between the drilling tool and the wall of a well into rolling friction at highly deviated well, horizontal well directional drilling in -process, be favorable to moment of torsion release, reduce to rub and hinder, effectively avoid the drilling tool to glue phenomenons such as card, backing pressure and take place, greatly improve directional mechanical drilling speed and directional effect.
Description
Technical field
The utility model relates to a kind of directed screw rod centralizer, is applied to petroleum drilling technology field, is applicable to the directional drilling of the unconventional horizontal well of long horizontal sections.
Background technology
Along with the growth of international energy demand, for strengthening the exploitation to all kinds of Complex Fault Block Oil Reservoir and nontraditional reservoir, improve recovery ratio, extended horizontal well technology obtains applying more and more widely, especially the unconventional horizontal well drilling technology development of long horizontal sections in recent years rapidly, region relates to Central Plains, triumph, Sichuan, the ground such as northern Shensi, the horizontal segment length's segment base of unconventional horizontal well is originally all at more than 1000m, through Strata Comparison and sieve residue log analysis, the horizontal segment of frequent needs within hole deviation 90 ° ~ 95 ° carries out directed TRAJECTORY CONTROL, guarantee that drill bit is walked to greatest extent in oil reservoir, to improve reservoir-encountered rate.The drilling well difficult point brought thus and risk are also increasing, and large hole deviation long horizontal sections uses existing centralizer for screwdrill, and can not meet the growth requirement of horizontal well drilling technology, drilling efficiency is low, frequently occurs backing pressure phenomenon, and card Frequent Accidents is glued in down-hole.
ZL200820080664.3 discloses a kind of half chip single bend PDM centralizer, this centralizer comprises three wiper blocks, one piece, base, side two pieces, and base centralizer thickness 5-20mm thicker in side, three wiper blocks are welded on bottom single bend PDM outer wall with spirality vertically.The application of this centralizer is comparatively general, apply through scene, exist with borehole wall fulcrum many, contact surface is large, the advantages such as directional orientation tool face is comparatively stable, but along with extending service time, have the following disadvantages: (1) thicker base wiper block affects the discharge of High angle well landwaste, landwaste is easily piled up near the wiper block of base, and backing pressure phenomenon can not get alleviating; (2) in directional drilling process, because spiral centering device and borehole wall contact surface are large, frictional resistance is large, and use the stable advantage in later stage directional orientation tool face to fade away, tool-face is put not in place, affects directional effect.
ZL201220637922 discloses a kind of centralizer for screwdrill structure, wiper block quantity is more than three or three, in straightedge column, be integral type structure with helicoid hydraulic motor body, through scene application, this screw rod centralizer is straightedge structure,, shaft bottom landwaste many with borehole wall fulcrum such as easily to discharge at the advantage, but also have the following disadvantages: (1) this type of centralizer structure because of centralizer quantity more and do not carry out antifriction process, frictional resistance is comparatively large, is not suitable for directional drilling; (2) abrasionproof process is not carried out on centralizer surface, and application life is limited.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of directed screw rod centralizer, its can overcome the drilling efficiency easily occurred in long horizontal sections horizontal well directional drilling process low, frequently there is backing pressure, down-hole glues the problems such as card Frequent Accidents, and do not affect the actual build angle rate of screw rod.
For achieving the above object, the technical scheme that the utility model is taked is:
A kind of directed screw rod centralizer, comprise the power transmission shaft of helicoid hydraulic motor, described power transmission shaft is provided with two wiper blocks along its axially extended straightedge shape on the outer wall near the low limit of well, the cavity that two wiper blocks and the low limit of well are formed forms guiding gutter, two wiper block external surfaces are provided with ball grooves, in ball grooves, are embedded with ball.
Described two wiper blocks are wholely set on described power transmission shaft.
Described righting block length 250-350mm, wide 80-110mm, thick 10-20mm, the angle between two wiper blocks is 80 °-100 °, and wiper block two ends are provided with chamfering inclined-plane, and the angle of chamfering inclined-plane and wiper block external surface is 10 °-30 °.
Described ball grooves is furnished with two rows along wiper block length direction on wiper block external surface, and often row has seven ball grooves.
The described width stating guiding gutter is 60-100mm.
Described ball diameter is 15-20mm.
Screw drill transmission shaft of the present utility model is provided with two wiper blocks along its axially extended straightedge shape on the outer wall near the low limit of well, two wiper block tops and well flash have larger annular space, two wiper block bottoms and the low limit of well form guiding gutter simultaneously, landwaste can be removed by guiding gutter in time, avoid talus deposit near high angle hole eyebolt centralizer, effective alleviation backing pressure, improves directional inclination effect; Two wiper blocks are all evenly equipped with ball grooves on the external surface of power transmission shaft, in ball grooves, ball is installed, can the sliding friction between drilling tool and the borehole wall be changed into rolling friction in high angle hole, horizontal well directional drilling process, be conducive to moment of torsion release, reduce frictional resistance, effectively avoid drilling tool to glue the phenomenons such as card, backing pressure to occur, greatly improve directed rate of penetration and directional effect.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the utility model embodiment.
Fig. 2 is A-A sectional view in Fig. 1.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1 and Figure 2, a kind of directed screw rod centralizer, comprise the power transmission shaft 1 of helicoid hydraulic motor, power transmission shaft 1 is provided with two wiper blocks 2 along its axially extended straightedge shape on the outer wall near the low limit of well 7, the cavity that two wiper blocks 2 and the low limit 7 of well are formed forms guiding gutter 5, two wiper block 2 tops and well flash 6 have larger annular space, the width of guiding gutter 5 is 60-100mm, landwaste can be removed by guiding gutter 5 in time, avoid talus deposit near high angle hole eyebolt centralizer, effective alleviation backing pressure, improves directional inclination effect.Two wiper block 2 external surfaces are provided with ball grooves 3, in ball grooves 3, are embedded with ball 4.Wiper block 2 has five faces, and the face of wiper block 2 left and right sides is side, and the face of rear and front end is end face, and a face away from power transmission shaft 1 is external surface.
Two wiper blocks 2 are wholely set on power transmission shaft 1, and power transmission shaft 1 carries out integrated processing with two wiper blocks 2, do not need welding, firmly overall.Righting block length 250-350mm, wide 80-110mm, thick 10-20mm, between two wiper blocks, angle is 80 °-100 °, stays the guiding gutter 5 of enough broad gaps in the middle of two wiper blocks 2, can not affect screw rod build angle rate simultaneously.Wiper block 2 two ends are provided with chamfering inclined-plane, and the angle of chamfering inclined-plane and wiper block external surface is 10 °-30 °.
Ball grooves 3 is furnished with two rows along wiper block length direction on wiper block 2 external surface, and often row has seven ball grooves 3, and ball grooves 3 is sphere hole, and its external surface aperture is little, and inner surface aperture is large, for detent ball 4, makes it to come off.Ball 4 is adopted and is made of a steel, and ball 4 surface studs with hard alloy layer, and it can prevent Fast Wearing, improves ball abrasion resistance and application life.Ball 4 diameter is 15-20mm.
Claims (6)
1. a directed screw rod centralizer, comprise the power transmission shaft of helicoid hydraulic motor, it is characterized in that: described power transmission shaft is provided with two wiper blocks along its axially extended straightedge shape on the outer wall near the low limit of well, the cavity that two wiper blocks and the low limit of well are formed forms guiding gutter, two wiper block external surfaces are provided with ball grooves, in ball grooves, are embedded with ball.
2. directed screw rod centralizer according to claim 1, is characterized in that: described two wiper blocks are wholely set on described power transmission shaft.
3. directed screw rod centralizer according to claim 1, it is characterized in that: described righting block length 250-350mm, wide 80-110mm, thick 10-20mm, two wiper block angles are 80 °-100 °, wiper block two ends are provided with chamfering inclined-plane, and the angle of chamfering inclined-plane and wiper block external surface is 10 °-30 °.
4. directed screw rod centralizer according to claim 1, is characterized in that: described ball grooves is furnished with two rows along wiper block length direction on wiper block external surface, and often row has seven ball grooves.
5. directed screw rod centralizer according to claim 1, is characterized in that: the width of described guiding gutter is 60-100mm.
6. directed screw rod centralizer according to claim 1, is characterized in that: described ball diameter is 15-20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520411605.XU CN204782824U (en) | 2015-06-15 | 2015-06-15 | Directional screw rod centralizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520411605.XU CN204782824U (en) | 2015-06-15 | 2015-06-15 | Directional screw rod centralizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204782824U true CN204782824U (en) | 2015-11-18 |
Family
ID=54522892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520411605.XU Expired - Fee Related CN204782824U (en) | 2015-06-15 | 2015-06-15 | Directional screw rod centralizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204782824U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194004A (en) * | 2016-08-30 | 2016-12-07 | 天津立林石油机械有限公司 | Nearly drill bit driving-shaft assembly |
| CN108868585A (en) * | 2018-07-30 | 2018-11-23 | 天津立林石油机械有限公司 | Gauge cutting type driving-shaft assembly |
-
2015
- 2015-06-15 CN CN201520411605.XU patent/CN204782824U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194004A (en) * | 2016-08-30 | 2016-12-07 | 天津立林石油机械有限公司 | Nearly drill bit driving-shaft assembly |
| CN108868585A (en) * | 2018-07-30 | 2018-11-23 | 天津立林石油机械有限公司 | Gauge cutting type driving-shaft assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 Termination date: 20180615 |