CN204326997U - Low frictional resistance fracturing string rigid centralizer - Google Patents
Low frictional resistance fracturing string rigid centralizer Download PDFInfo
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- CN204326997U CN204326997U CN201420707672.1U CN201420707672U CN204326997U CN 204326997 U CN204326997 U CN 204326997U CN 201420707672 U CN201420707672 U CN 201420707672U CN 204326997 U CN204326997 U CN 204326997U
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- roller
- righting strip
- centralizer
- roller bearing
- frictional resistance
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Abstract
The utility model relates to a kind of low frictional resistance and splits tubing string rigid centralizer.Mainly comprise: righting strip, roller bearing, roller, liquid flow path, centralizer body.Each righting strip all has one, along the groove of axial distribution, righting strip lays roller bearing, roller bearing is fixed by welding on righting strip, in the groove of righting strip, lay roller, and roller housing is contained on roller bearing, is liquid flow path between righting strip.Centralizer structure of the present utility model is relatively simple, is easy to operation, contributes to pressing crack construction and carry out smoothly, thus reduces down-hole accident, cost-saving, has broad application prospects.
Description
Technical field
The utility model relates to fracturing string erection device in a kind of pressing crack construction process in downhole tool field, particularly one low frictional resistance fracturing string centralizer.
Technical background
In marine oil and gas and unconventionaloil pool development process, horizontal well, extended reach well or multilateral well are widely used.Staged fracturing of horizontal well technology has played important effect in raising oil-gas mining efficiency, and it can increase oil-gas reservoir contact area greatly, is current more efficient fracturing process.
In prior art, what in pressing crack construction, fracturing string erection device mainly adopted is rigid helical centralizer.But in actual applications, rigid helical centralizer mainly also exists following not enough: 1. rigid helical centralizer trips out or the lower fashionable effect due to frictional force at tubing string, turning moment can be produced to tubing string, easily cause the connecting thread between tubing string to loosen, and cause pipe column falling well accident; 2., when liquid is by rigid helical centralizer, liquid not only also in the angle that rotates in a circumferential direction, will must add the resistance to liquid flow in axial flow; 3. rigid helical centralizer can produce the component of circumference thus can produce break-out torque.
Chuan Qing drilling project Co., Ltd discloses a kind of rigid centralizer for oil tube in China Patent No. " 201120125174.2 ".The linearly type distribution of its righting strip, solves rotation torque problem, but righting strip is still sliding friction with sleeve pipe or the bore hole borehole wall, does not greatly reduce string friction.
Utility model content
In view of above reason, the utility model proposes a kind of low frictional resistance fracturing string rigid centralizer, it not only can avoid the generation of rotation torque, the frictional resistance of fracturing string in work progress also can be made greatly to reduce, be more conducive to pressing crack construction and carry out smoothly.
The technical solution of the utility model is:
Low frictional resistance fracturing string rigid centralizer, comprise righting strip and centralizer body, roller bearing and roller, roller housing is contained on roller bearing, each righting strip all has a groove along axial distribution, in the groove of righting strip, lay roller bearing and roller, be liquid flow path between righting strip.
Such scheme comprises further:
Described righting strip linearly type, the external surface at groove place is in the arc-shaped, forms a concentric circles with centralizer body.
The righting strip at described two ends is divided into two-layer up and down, and every layer of circumference is evenly arranged four, and 90 degree, interval is evenly arranged in circumference; Lower floor and upper strata are that 45 degree of intervals are arranged.
Described roller and roller bearing are divided into upper and lower two groups to be arranged on side by side in the groove of righting strip, and roller adopts spindle, and the outside diameter that spindle is formed is roughly the same with casing inner diameter or bore hole hole diameter.
Roller bearing is fixed in the groove of righting strip by welding or briquetting lock mode.
Centralizer site operation flow process of the present utility model is as follows:
Centralizer is arranged on fracturing string surface, and along with fracturing string enters well, its roller bearing becomes rolling friction with roller, roller with internal surface of sleeve pipe or the bore hole borehole wall.
Fracturing fluid flows into from the fluid passage formed between adjacent two righting strips of one end, after the righting strip shunting of the other end relative with passage, flows out from the passage of these righting strip both sides.
Advantage of the present utility model:
1. this Novel centralizer righting strip is in line type, can not produce circumferential component, thus can not produce break-out torque, and the structure of itself is less in pressing crack construction process, and frictional resistance is less at liquid-circulating and when playing lower tubular column.
2. on the centralizer body that this Novel centralizer one end righting strip is relative between adjacent two righting strips of the other end, the component of circumference can not be produced, thus shackle moment can not be produced, and less to the circulation resistance of liquid in annular space, for the righting of non-rotary pipe string.
3. the spacing between adjacent two straight righting strips in the every one end of this Novel centralizer is identical, and the righting strip at two ends is four, becomes cross-distribution, thus ensure that 360 ° of rightings of fracturing string.
4. this centralizer roller and roller bearing, roller and internal surface of sleeve pipe or the bore hole borehole wall are rolling friction, enter under can greatly reducing fracturing string or on carry frictional resistance.
5. roller adopts spindle, and the outside diameter that spindle is formed is roughly the same with casing inner diameter or bore hole hole diameter, roller is contacted better with internal surface of sleeve pipe or the bore hole borehole wall, avoids stress concentration phenomenon.
6. roller spindle radius of curvature can change, and it makes corresponding adjustment according to casing inner diameter or bore hole hole diameter difference, applied widely.
7. the outline external diameter that formed of the roller of centralizer arbitrary section slightly larger than centralizer righting strip form the external diameter of outline, roller can be made so better to contact with internal surface of sleeve pipe or the bore hole borehole wall, make resistance reducing effect better.
8. the roller bearing on this centralizer righting strip and roller size can be tried one's best increasing in limited space, ensure the intensity of pressure break operating mode.
9. this Novel centralizer structure is simple, is easy to operation, contributes to pressing crack construction and carry out smoothly, thus reduces down-hole accident, cost-saving, has broad application prospects.
The beneficial effect of utility model:
Design of the present utility model is the generation in order to avoid rotation torque, enters the frictional resistance in process, pressing crack construction is carried out smoothly under reducing fracturing string.
Accompanying drawing explanation
Fig. 1 is centralizer elevation of the present utility model.
Fig. 2 is centralizer A-A sectional view of the present utility model.
In figure: 1, righting strip; 2, roller bearing; 3, roller; 4, fracturing fluid passage; 5, centralizer body.
Detailed description of the invention
X-Y scheme of the present utility model is shown in Figure of description 1, accompanying drawing 2.
1, as shown in Figure 1, the utility model is made up of righting strip 1, roller bearing 2, roller 3, liquid flow path 4, centralizer body 5.
2, the righting strip 1 at two ends is four, and becomes 45 degree of crossed-symmetrical distributions.
3, roller 3 is designed to spindle, and spindle longitudinal middle section external arc diameter is roughly the same with casing inner diameter or bore hole hole diameter.
4, centralizer is arranged on fracturing string surface, and along with fracturing string enters well, its roller bearing 2 becomes rolling friction with roller 3, roller 3 with internal surface of sleeve pipe or the bore hole borehole wall.
5, fracturing fluid flows into from the fluid passage 4 formed between adjacent two righting strips of one end, after the righting strip 1 of the other end relative with passage is shunted, flows out from the passage of these righting strip 1 both sides.
This centralizer structure feature is as follows:
Low frictional resistance fracturing string rigid centralizer, comprise righting strip, centralizer body, roller bearing and roller, roller housing is contained on roller bearing, each righting strip all has a groove along axial distribution, in the groove of righting strip, lay roller bearing and roller, be liquid flow path between righting strip.Righting strip is type linearly, and the external surface at groove place is in the arc-shaped, forms a concentric circles with centralizer body.Righting strip is four, and 90 degree, interval is evenly arranged in circumference.The righting strip at two ends is divided into two-layer up and down, and every layer of circumference is evenly arranged four; Lower floor and upper strata are that 45 degree of intervals are arranged.Roller and roller bearing are divided into two-layer being up and down arranged on side by side in the groove of righting strip.Roller bearing is fixed by welding in the groove of righting strip.
Spacing between adjacent two righting strips of every one deck is identical, and bilevel righting strip is four, is symmetrically distributed.Roller and roller bearing are matched in clearance, and the fluid passage formed between adjacent two righting strips provides fracturing fluid flow channel.
Claims (5)
1. low frictional resistance fracturing string rigid centralizer, comprise righting strip (1) and centralizer body (5), it is characterized in that: also comprise roller bearing (2) and roller (3), roller (3) is sleeved on roller bearing (2), each righting strip (1) all has a groove along axial distribution, in the groove of righting strip (1), lay roller bearing (2) and roller (3), be liquid flow path (4) between righting strip.
2. low frictional resistance fracturing string rigid centralizer according to claim 1, it is characterized in that: described righting strip (1) linearly type, the external surface at groove place is in the arc-shaped, forms a concentric circles with centralizer body (5).
3. low frictional resistance fracturing string rigid centralizer according to claim 1 and 2, is characterized in that: the righting strip (1) at described two ends is divided into two-layer up and down, and every layer of circumference is evenly arranged four, and 90 degree, interval is evenly arranged in circumference; Lower floor and upper strata are that 45 degree of intervals are arranged.
4. low frictional resistance fracturing string rigid centralizer according to claim 3, it is characterized in that: described roller (3) and roller bearing (2) are divided into upper and lower two groups to be arranged in the groove of righting strip (1) side by side, roller adopts spindle, and the outside diameter that spindle is formed is roughly the same with casing inner diameter or bore hole hole diameter.
5. low frictional resistance fracturing string rigid centralizer according to claim 4, is characterized in that: roller bearing is fixed in the groove of righting strip (1) by welding or briquetting lock mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420707672.1U CN204326997U (en) | 2014-11-21 | 2014-11-21 | Low frictional resistance fracturing string rigid centralizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420707672.1U CN204326997U (en) | 2014-11-21 | 2014-11-21 | Low frictional resistance fracturing string rigid centralizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204326997U true CN204326997U (en) | 2015-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420707672.1U Expired - Fee Related CN204326997U (en) | 2014-11-21 | 2014-11-21 | Low frictional resistance fracturing string rigid centralizer |
Country Status (1)
| Country | Link |
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| CN (1) | CN204326997U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041234A (en) * | 2015-06-29 | 2015-11-11 | 中国石油集团渤海钻探工程有限公司 | Spiral semi-rigid centralizer |
-
2014
- 2014-11-21 CN CN201420707672.1U patent/CN204326997U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041234A (en) * | 2015-06-29 | 2015-11-11 | 中国石油集团渤海钻探工程有限公司 | Spiral semi-rigid centralizer |
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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: 20150513 Termination date: 20201121 |