CN203008808U - Casing centralizer with variable diameter and rotational flow function - Google Patents
Casing centralizer with variable diameter and rotational flow function Download PDFInfo
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- CN203008808U CN203008808U CN 201320021932 CN201320021932U CN203008808U CN 203008808 U CN203008808 U CN 203008808U CN 201320021932 CN201320021932 CN 201320021932 CN 201320021932 U CN201320021932 U CN 201320021932U CN 203008808 U CN203008808 U CN 203008808U
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Abstract
The utility model relates to a casing centralizer with a variable diameter and a rotational flow function. The technical scheme provided by the utility model is that the casing centralizer comprises a coupling, an inner seal ring, an outer seal ring, a piston, a spring, a retaining pin, a hydraulic cavity, a centralizing spring piece and a main body. The casing centralizer has the designed significances that the structure is simple, and the centralizing spring piece is wrapped in the hydraulic cavity before tripping in, and is in a pre-bending state; the outer diameter of the casing centralizer can be extremely smaller than that of a conventional rigid centralizer during a tripping in process, so that the casing tripping in friction can be reduced effectively, the tripping in safety is increased, and particularly the centralizer has the remarkable advantages in slim holes; when tripping in the designed well depth, the casing is centralized by pressing, and the centralizing degree can reach 100%; and a spiral groove is formed in the outside, the rotational flow can be produced during well cementation, then the displacement efficiency of cement paste is improved, and finally the well cementation quality of an oil and gas well is improved remarkably.
Description
Technical field
The present invention relates to a kind of radial variable casing tube centralizer with the eddy flow function in oil gas well cementing operation, completion technique field.
Background technology
At present, because horizontal well can be linked up more reservoir or crack, can greatly increase the earial drainage area of oil gas, so horizontal well is the first-selection of exploitation.Horizontal well casing pipe well cementation completion not only can effectively reduce due to shaft bottom complex situations such as hole-size elongation, hole collapse, Container Rock Sandings; Can also provide better segmented seal performance for staged fracturing; play a part very positive to improving fracturing effect; using especially extensively in the exploitation of unconventional petroleum resources, is all for example the horizontal well casing pipe well cementation completion that adopts more than 80% in global shale gas exploitation.Yet, the quality of horizontal well casing pipe well cementation completion is all the time all very inferior, and qualification rate is all very low, thereby damages oil extraction pipeline because the factors such as strata pressure cause sleeve pipe generation gross distortion, and restricted the application of the well stimulations such as refracturing, made oil and gas production have a greatly reduced quality.Due to the restriction of conventional centralizer external diameter, make conventional centralizer limited to raising placed in the middle, especially in the slim-holes such as 6inch, for guaranteeing being lowered to smoothly of sleeve pipe, the external diameter of centralizer designs very littlely, and the centralizer of casing stabbing board is usually lower than 70%.And due to the vibrations of drill bit and the erosion of drilling fluid, usually greater than the size of drill bit, therefore conventional casing stabbing board does not reach the requirement of the centralizer that improves cementing quality to well to well in the process of creeping into usually.In a word, it is not high that existing present horizontal well casing pipe well cementation completion exists drilling fluid, and cementing quality is inferior; The centralizer external diameter is larger, is having a strong impact on the safety that is lowered to of sleeve pipe.It is particularly outstanding that this kind situation shows in The Small Well.
By above-mentioned analysis as can be known, existing present centralizer is seriously restricting the safety that is lowered to of the cementing quality of horizontal well casing pipe well cementation and sleeve pipe, and especially head it off exists necessity and urgency in slim-hole.The present invention is simple in structure, being lowered to front righting spring leaf is wrapped in inside hydraulic cavities, and be in the pre-bending state, can easier the righting spring leaf be overhanged, hydraulic variable diameter spring sleeve pipe of the present invention holds up device to compare its external diameter with conventional centralizer can reduce 20%, and its centralizer can reach 100%, and it can also provide eddy flow, to increase the displacement efficiency of cement paste, the cementing quality of the well of finally improving the standard.
The utility model content
The present invention is simple in structure, is lowered to front righting spring leaf and is wrapped in inside hydraulic cavities, and be in the pre-bending state, can easier the righting spring leaf be overhanged; Fully keep away the general shortcoming except existing casing stabbing board, adopt the principle of hydraulic-driven Spring deformation, make centralizer can reach 100%, external diameter reduces 20%; Improve centralizer, increase sleeve pipe be lowered to safety in, can also allow cementing slurry produce eddy flow to improve the displacement efficiency of cement paste, really the quality of horizontal well casing pipe well cementation is brought up to a new stage.
the utility model is achieved in that in main body (11) upper by box cupling (1), inner seal ring (3), exterior seal ring (4), piston (5), spring (6), retaining pin (7), hydraulic cavities (8), righting spring leaf (10) is assembled, it is characterized in that: inner seal ring (3), exterior seal ring (4), piston (5), spring (6), retaining pin (7), righting spring leaf (10) is assemblied in inside hydraulic cavities (8), box cupling (1) is threaded connection hydraulic cavities (8) spacing with main body (11), spring (6), retaining pin (7) is assemblied in the aperture of the upper axial symmetry distribution of piston (5), the upper axial symmetry of main body (11) has 4 hydraulic pressure holes (2) and retaining hole (9).
Described: hydraulic cavities (8) outside has 3 to 6 and becomes 30 ° of helicla flutes to 60 ° of angles (12) with axis.
Described: the support chip that has 3 to 8 Homogeneous Axisymmetricals to distribute on righting spring leaf (10) is wrapped in when support chip does not strut inside hydraulic cavities (8), and is in radially pre-bending state.
operating principle: be lowered to front assembling centralizer, make righting spring leaf (10) be in radially pre-bending state, so that its hydraulic pressure required during to casing centering is less, easier righting, sleeve pipe is lowered in process, righting spring leaf (7) is contracted in inside hydraulic cavities (2), can guarantee not only to be lowered to that in process, righting spring leaf (10) can not overhang, can also make the external diameter with the radial variable casing tube centralizer of eddy flow function become very little, the sleeve pipe frictional resistance can be greatly reduced during setting of casing, cased safety can be significantly increased, when the well cementing pipe string is lowered into assigned address, to suppressing with the radial variable casing tube centralizer of eddy flow function, this moment, hydraulic pressure was delivered on piston (5) from the hydraulic pressure hole (2) on main body (11), piston (5) moves right, thereby axial compression righting spring leaf (10), be in the support chip radial deformation displacement of radially pre-bending on righting spring leaf (10), spring (6) moves right with retaining pin (7) simultaneously, retaining pin (7) coordinates with retaining hole (9) under the elastic force of spring (6) when moving to design attitude, thereby stop spring leaf to be moved to the left, this moment, spring leaf can not radial contraction, casing centering is complete, during to the well cementing well, cement paste is at the upper eddy flow that produces of helicla flute (12), thereby the displacement efficiency of raising cement paste finally reaches the purpose that improves cementing quality.
Advantage of the present invention and beneficial effect are: simple in structure, and be lowered to front righting spring leaf and be wrapped in inside hydraulic cavities, and be in the pre-bending state, the righting spring leaf is more easily overhanged; Its external diameter can little 20% left and right than conventional centralizer external diameter in being lowered to process, can effectively reduce sleeve pipe and be lowered to frictional resistance, increases to be lowered to safety, and especially this centralizer has advantage significantly in slim-hole; Suppress during down to the design well depth sleeve pipe is carried out righting, its centralizer can reach 100%, can produce eddy flow, improve the displacement efficiency of cement paste, can effectively satisfy the requirement that improves cementing quality, increase the stability of well, improve oil and gas production, this casing stabbing board can effectively be applied to various well types.
Description of drawings
Fig. 1 is the radial variable casing tube centralizer half sectional view of liquid band eddy flow function;
Fig. 2 is the view profile of Fig. 1.
The specific embodiment
as Fig. 1, Fig. 2, shown in Figure 3: be lowered to front assembling centralizer, make righting spring leaf (10) be in radially pre-bending state, so that its hydraulic pressure required during to casing centering is less, easier righting, sleeve pipe is lowered in process, righting spring leaf (7) is contracted in inside hydraulic cavities (2), can guarantee that not only the process that the is lowered to reed of being hit by a bullet can not overhang, can also make the external diameter with the radial variable casing tube centralizer of eddy flow function become very little, can greatly reduce the sleeve pipe frictional resistance during setting of casing, significantly increase cased safety, when the well cementing pipe string is lowered into assigned address to suppressing with the radial variable casing tube centralizer of eddy flow function, this moment, hydraulic pressure was delivered on piston (5) from the hydraulic pressure hole (2) on main body (11), piston (5) moves right, thereby axial compression righting spring leaf (10), be in the support chip radial deformation displacement of radially pre-bending on righting spring leaf (10), spring (6) moves right with retaining pin (7) simultaneously, retaining pin (7) coordinates with retaining hole (9) under the elastic force of spring (6) when moving to design attitude, thereby stop spring leaf to be moved to the left, this moment, spring leaf can not radial contraction, casing centering is complete, during to the well cementing well, cement paste is at the upper eddy flow that produces of helicla flute (12), thereby the displacement efficiency of raising cement paste finally reaches the purpose that improves cementing quality.
Claims (3)
1. radial variable casing tube centralizer with the eddy flow function, upper by box cupling (1) in main body (11), inner seal ring (3), exterior seal ring (4), piston (5), spring (6), retaining pin (7), hydraulic cavities (8), righting spring leaf (10) is assembled, it is characterized in that: inner seal ring (3), exterior seal ring (4), piston (5), spring (6), retaining pin (7), righting spring leaf (10) is assemblied in inside hydraulic cavities (8), box cupling (1) is threaded connection hydraulic cavities (8) spacing with main body (11), spring (6), retaining pin (7) is assemblied in the aperture of the upper axial symmetry distribution of piston (5), the upper axial symmetry of main body (11) has 4 hydraulic pressure holes (2) and retaining hole (9).
2. the radial variable casing tube centralizer with the eddy flow function according to claim 1 is characterized in that: hydraulic cavities (8) outside has 3 to 6 and becomes 30 ° of helicla flutes to 60 ° of angles (12) with axis.
3. the radial variable casing tube centralizer with the eddy flow function according to claim 1, it is characterized in that: the support chip that has 3 to 8 Homogeneous Axisymmetricals to distribute on righting spring leaf (10), be wrapped in when support chip does not strut inside hydraulic cavities (8), and be in radially pre-bending state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320021932 CN203008808U (en) | 2013-01-16 | 2013-01-16 | Casing centralizer with variable diameter and rotational flow function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320021932 CN203008808U (en) | 2013-01-16 | 2013-01-16 | Casing centralizer with variable diameter and rotational flow function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203008808U true CN203008808U (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320021932 Expired - Fee Related CN203008808U (en) | 2013-01-16 | 2013-01-16 | Casing centralizer with variable diameter and rotational flow function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115708A (en) * | 2015-07-27 | 2015-12-02 | 中国石油天然气股份有限公司 | Performance parameter testing system and method for hydraulic variable diameter centralizer |
| CN106014304A (en) * | 2016-06-30 | 2016-10-12 | 中国石油集团西部钻探工程有限公司 | Swirling flow device for well cementation |
| CN108843274A (en) * | 2018-06-28 | 2018-11-20 | 东北石油大学 | Water-jet spinning drag bit and carbon dioxide injection well de-plugging process |
-
2013
- 2013-01-16 CN CN 201320021932 patent/CN203008808U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115708A (en) * | 2015-07-27 | 2015-12-02 | 中国石油天然气股份有限公司 | Performance parameter testing system and method for hydraulic variable diameter centralizer |
| CN106014304A (en) * | 2016-06-30 | 2016-10-12 | 中国石油集团西部钻探工程有限公司 | Swirling flow device for well cementation |
| CN108843274A (en) * | 2018-06-28 | 2018-11-20 | 东北石油大学 | Water-jet spinning drag bit and carbon dioxide injection well de-plugging process |
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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: 20130619 Termination date: 20140116 |