CN111594063A - Variable-diameter centralizer activated by chemical signal and using method thereof - Google Patents
Variable-diameter centralizer activated by chemical signal and using method thereof Download PDFInfo
- Publication number
- CN111594063A CN111594063A CN202010440311.5A CN202010440311A CN111594063A CN 111594063 A CN111594063 A CN 111594063A CN 202010440311 A CN202010440311 A CN 202010440311A CN 111594063 A CN111594063 A CN 111594063A
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- China
- Prior art keywords
- centralizer
- variable
- diameter
- steel belt
- chemical signal
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- 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
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1014—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
- E21B17/1021—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well with articulated arms or arcuate springs
- E21B17/1028—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well with articulated arms or arcuate springs with arcuate springs only, e.g. baskets with outwardly bowed strips for cementing operations
Abstract
The invention discloses a variable-diameter centralizer activated by chemical signals and a using method thereof, belonging to the field of oil and gas well engineering. The steel belt buckle of the variable-diameter centralizer is fixed at the middle position of the centralizing strip of the single-arch elastic centralizer in a welding manner, and the steel belt is positioned at the middle position of the steel belt buckle; the chemical signal activation lock is fixed on the head of the steel strip through a screw; the structure of the chemical signal activation lock comprises a cylinder body, a cylinder body cover, a rotating plate, a pull rod, a pull block, a spring, a baffle, an anti-friction ring, filter paper, a screw, a rotating shaft and a gasket; when the variable-diameter centralizer descends to a designated position, the PH of the drilling fluid is changed by adding sodium hydroxide into the drilling fluid, a chemical signal activates aluminum hydroxide solids in the lock to be dissolved, two compressed springs are released, the baffle plate ascends, the rotating plate rotates, the pull rod pulls out the pull block, the steel belt is released, and the centralizing strip is in a springing-open state; thereby ensuring the centering of the cannula; the time for lowering the casing into the well is shortened; finally, the well cementation quality is improved, and the service life of the oil-gas well is prolonged.
Description
Technical Field
The invention belongs to the field of oil and gas well engineering, and particularly relates to a chemical signal activated variable-diameter centralizer and a use method thereof.
Background
The centering of the sleeve is an important premise for ensuring the well cementation quality, and the poor centering degree of the sleeve easily causes the problems of cement eccentric flow, drilling fluid retention, displacement channeling, local loss of a solidified cement sheath and the like in an annular space, so that the interlayer can not be sealed; meanwhile, the poor casing centering degree can make the well cementation process and the technical efficiency of materials difficult to fully exert, and the well cementation quality cannot be ensured. Experimental data and field practice show that when the casing centering degree is larger than 67%, the cement slurry replacement efficiency can be ensured by adjusting rheological properties of drilling fluid and cement slurry, increasing density difference and other measures. The most effective method for improving the centering degree is to use the centralizer, the existing centralizer is mostly a rigid centralizer and an elastic centralizer, but the rigid centralizer has a small outer diameter and cannot play a role in righting irregular well sections, big-belly well sections and sugarcoated haw well sections, and a righting strip with large deformation in the elastic centralizer easily causes the increase of the frictional resistance of the casing when the casing goes into the well. Therefore, the diameter-variable centralizer is urgently needed, and the centralizing strips are bound before entering the well, so that the problem of high frictional resistance when the casing is put into the well is solved. After the well is drilled, the centralizing strips are bounced, the well drilling time of the casing is shortened, and the centering degree of the casing is ensured.
Disclosure of Invention
The invention aims to provide a chemical signal activated variable-diameter centralizer and a using method thereof.A steel belt buckle is fixed at the middle position of a centralizing strip of a single-arch elastic centralizer by welding, and the steel belt is positioned at the middle position of the steel belt buckle;
the chemical signal activation lock structurally comprises a cylinder body, a cylinder body cover, a rotating plate, a pull rod, a pull block, a spring, a baffle, an anti-friction ring, filter paper, a screw, a rotating shaft and a gasket; the lower end of the lower spring is fixed on the cylinder body through screws, the upper end of the upper spring is fixed on the baffle through screws, the antifriction rings are tightly adhered on the baffle, a plurality of small holes are formed in the baffle, the baffle and the antifriction rings are positioned on the upper portion of the inner cavity of the cylinder body, the rotating plate is connected with the cylinder body through a rotating shaft, the pull rod is connected with the rotating plate through the rotating shaft, the pull block is connected with the pull rod through the rotating shaft, the pull block fixes the steel belt in the activation lock through the small holes in the rigid belt, the filter paper and the front and rear bottom plates are fixed together with the cylinder body through screws, the filter paper only allows water molecules and.
The antifriction ring is a rubber ring coated with an antifriction coating.
The variable diameter centralizer uses sodium hydroxide and aluminum hydroxide as activating substances.
The maximum outer diameter of the variable-diameter centralizer after being bound is 175mm-190mm, the maximum outer diameter of the centralizer after being activated is 225mm-245mm, and the length of the centralizer is 530mm-550 mm.
The maximum outer diameter of the variable-diameter centralizer after being bound is 180mm, the maximum outer diameter of the centralizer after being activated is 235mm, and the length of the centralizer is 540 mm.
A method for using a chemical signal activated variable-diameter centralizer is characterized in that a steel belt buckle, a steel belt and an activation lock assembly are installed in the middle of a single-bow elastic centralizer, after the variable-diameter centralizer descends to a specified position, the PH value of drilling fluid is changed by adding sodium hydroxide into the drilling fluid, the PH value of the drilling fluid reaches more than 12, aluminum hydroxide solids in a chemical signal activated lock are dissolved, two compressed springs are released, a baffle plate ascends, a rotating plate rotates, a pull rod is drawn out of a pull block, the steel belt is released, and a centralizer strip is in a springing-open state; thereby ensuring the centering of the sleeve.
The variable-diameter centralizer has the beneficial effects that aluminum hydroxide solids in the lock are activated to be dissolved through chemical signals, the two compressed springs are released, the steel strip is released, and the centralizing strip is in a springing state, so that the centering degree of the casing is ensured; the invention has simple and reasonable structural design, lower processing cost and convenient assembly; the time for lowering the casing into the well is shortened; the quality of the oil and gas well is improved, and the economic benefit is increased.
Drawings
FIG. 1 is a schematic structural view of a variable diameter centralizer.
Reference numbers in the figures: 1-single bow elastic centralizer, 2-steel belt buckle, 3-steel belt, 4-activation lock.
FIG. 2 is a schematic diagram of a chemical signal activated lock; wherein a is a schematic diagram of an activation lock structure; b is a half-section schematic diagram of the cylinder body.
Reference numbers in the figures: 401-I # filter paper, 402-rear bottom plate, 403-I # rotating shaft, 404-II # rotating shaft, 405-rotating plate, 406-pull rod, 407-III # rotating shaft, 408-pull block, 409-gasket, 410-II # filter paper II, 411-front bottom plate, 412-aluminum hydroxide solid, 413-baffle plate, 414-antifriction ring, 415-upper spring, 416-lower spring, 417-cylinder body and 418-screw.
Detailed Description
The invention provides a chemical signal activated variable diameter centralizer and a use method thereof, and the invention is further described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the variable diameter centralizer. Wherein, the steel band buckle 2 of the single bow-shaped elastic centralizer 1 is fixed at the middle position of the centralizing strip of the single bow-shaped elastic centralizer 1 by welding, the steel band 3 is positioned at the middle position of the steel band buckle 2, and the chemical signal activation lock 4 is fixed at the head of the steel band 3 by a screw.
The chemical signal activated lock structurally comprises a cylinder body, a cylinder body cover, a rotating plate, a pull rod, a pull block, a spring, a baffle, an anti-friction ring, filter paper, a screw, a rotating shaft and a gasket; wherein, the I # filter paper 401 is clamped between the rear bottom plate 402 and the cylinder 417, and the II # filter paper 410 is clamped between the front bottom plate 411 and the cylinder 417; the filter paper only allows water molecules and ions to pass through but cannot allow solid particles to pass through; the rear bottom plate 402, the front bottom plate 411 and the cylinder body 417 are fixed through screws 418, the rotating plate 405 and the cylinder body 417 are connected through an I # rotating shaft 403, the pull rod 406 and the rotating plate 405 are connected through an II # rotating shaft 404, the pull block 408 and the pull rod 406 are connected through an III # rotating shaft 407, the pull block 408 and the cylinder body 417 are in clearance fit, the baffle 413 and the anti-friction ring 414 are bonded together, the anti-friction ring 414 and the cylinder body 417 are in clearance fit, and the anti-friction ring is a rubber ring coated with an anti-friction coating. An upper spring 415 and a lower spring 416 are placed in a cavity of a cylinder 417, the lower end of the lower spring 416 is fixed on the cylinder 417 through a screw, the upper end of the upper spring 415 is fixed on a baffle 413 through a screw, and a pull block 408 fixes the steel belt 3 in the activation lock 4 through a small hole on the steel belt 3; the variable diameter centralizer uses sodium hydroxide and aluminum hydroxide as activating substances.
The use process of the best embodiment of the invention is as follows: the middle part of a single-bow elastic centralizer 1 is provided with a steel belt buckle 2, a steel belt 3 and a chemical signal activation lock 4, a centralizing strip of the variable-diameter centralizer 1 is bound by the steel belt 3 before going down a well, after a casing pipe goes down to a specified position, sodium hydroxide is added into drilling fluid to enable the pH value of the drilling fluid to rise to be above 12, aluminum hydroxide 412 is dissolved in solid, a baffle 413 and an anti-friction ring 414 move upwards, a compressed upper spring 415 and a compressed lower spring 416 are released, a rotating plate 405 rotates to drive a pull rod 406 to move, a pull block 408 is drawn out, the steel belt 3 is released, and the centralizing strip is in an elastic state; the centering degree of the casing is ensured, and the time for running the casing into the well is shortened.
The maximum outer diameter of the variable-diameter centralizer after being bound is 180mm, the maximum outer diameter of the centralizer after being activated is 235mm, and the length of the centralizer is 540 mm.
Claims (6)
1. A variable-diameter centralizer activated by chemical signals is characterized in that a steel belt buckle of the variable-diameter centralizer is fixed at the middle position of a centralizing strip of a single-arch elastic centralizer in a welding mode, and the steel belt is located at the middle position of the steel belt buckle; the chemical signal activation lock is fixed on the head of the steel strip through a screw; the structure of the chemical signal activation lock comprises a cylinder body, a cylinder body cover, a rotating plate, a pull rod, a pull block, a spring, a baffle, an anti-friction ring, filter paper, a screw, a rotating shaft and a gasket; the lower end of the lower spring is fixed on the cylinder body through screws, the upper end of the upper spring is fixed on the baffle through screws, the antifriction rings are tightly adhered on the baffle, a plurality of small holes are formed in the baffle, the baffle and the antifriction rings are located on the upper portion of the spring in the cylinder body, the rotating plate is connected with the cylinder body through rotating shafts, the pull rod is connected with the rotating plate through the rotating shafts, the pull block is connected with the pull rod through the rotating shafts, the pull block fixes the steel belt in the activation lock through the small holes in the rigid belt, the filter paper and the front and rear bottom plates are fixed together with the cylinder body through screws, the filter paper only allows water molecules and.
2. The chemically signal activated variable diameter centralizer of claim 1 wherein the friction reducing ring is a rubber ring coated with a friction reducing coating.
3. The chemical signal activated variable diameter centralizer of claim 1, wherein the variable diameter centralizer uses sodium hydroxide and aluminum hydroxide as activating substances.
4. The chemical signal activated variable diameter centralizer of claim 1, wherein the maximum outside diameter of the variable diameter centralizer bound is 175mm to 190mm, the maximum outside diameter of the centralizer after activation is 225mm to 245mm, and the length of the centralizer is 530mm to 550 mm.
5. The chemical signal activated variable diameter centralizer of claim 1, wherein the maximum external diameter of the variable diameter centralizer bound is 180mm, the maximum external diameter of the centralizer after activation is 235mm, and the centralizer is 540mm in length.
6. The use method of the variable-diameter centralizer activated by the chemical signal is characterized in that a steel belt buckle, a steel belt and an activation lock assembly are arranged in the middle of the single-bow elastic centralizer, after the variable-diameter centralizer descends to a specified position, sodium hydroxide is added into drilling fluid to change the pH value of the drilling fluid to be more than 12, aluminum hydroxide solids in the chemical signal activation lock are dissolved, two compressed springs are released, a baffle plate ascends, a rotating plate rotates, a pull rod is drawn out of a pull block, the steel belt is released, and the centralizer is in a springing-open state; thereby ensuring the centering of the cannula; the time for lowering the casing into the well is shortened; the quality of the oil and gas well is improved, and the economic benefit is increased.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010440311.5A CN111594063B (en) | 2020-05-22 | 2020-05-22 | Variable-diameter centralizer activated by chemical signal and using method thereof |
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| CN202010440311.5A CN111594063B (en) | 2020-05-22 | 2020-05-22 | Variable-diameter centralizer activated by chemical signal and using method thereof |
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| CN111594063A true CN111594063A (en) | 2020-08-28 |
| CN111594063B CN111594063B (en) | 2021-10-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113123733A (en) * | 2021-05-18 | 2021-07-16 | 中国农业大学 | Variable-diameter centralizer based on control of self-expanding material meeting oil when meeting water and mechanical performance testing device thereof |
| CN114876383A (en) * | 2022-05-11 | 2022-08-09 | 中国农业大学 | Variable-diameter centralizer activated by wood's alloy and performance testing device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016003290A1 (en) * | 2014-07-02 | 2016-01-07 | Moonshine Solutions As | Centralizer device and method for deployment of a bore hole component in a borehole |
| CN107882515A (en) * | 2016-09-29 | 2018-04-06 | 陈晓新 | A kind of sleeve pipe suspending apparatus |
| CN110043200A (en) * | 2019-04-22 | 2019-07-23 | 中国农业大学 | A kind of reducing centralizer of magnetic signal activation |
-
2020
- 2020-05-22 CN CN202010440311.5A patent/CN111594063B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016003290A1 (en) * | 2014-07-02 | 2016-01-07 | Moonshine Solutions As | Centralizer device and method for deployment of a bore hole component in a borehole |
| CN107882515A (en) * | 2016-09-29 | 2018-04-06 | 陈晓新 | A kind of sleeve pipe suspending apparatus |
| CN110043200A (en) * | 2019-04-22 | 2019-07-23 | 中国农业大学 | A kind of reducing centralizer of magnetic signal activation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113123733A (en) * | 2021-05-18 | 2021-07-16 | 中国农业大学 | Variable-diameter centralizer based on control of self-expanding material meeting oil when meeting water and mechanical performance testing device thereof |
| CN114876383A (en) * | 2022-05-11 | 2022-08-09 | 中国农业大学 | Variable-diameter centralizer activated by wood's alloy and performance testing device |
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| Publication number | Publication date |
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| CN111594063B (en) | 2021-10-01 |
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