CN114455895A - Three-body cement slurry for repairing operation heavy oil well tail pipe - Google Patents
Three-body cement slurry for repairing operation heavy oil well tail pipe Download PDFInfo
- Publication number
- CN114455895A CN114455895A CN202210180500.2A CN202210180500A CN114455895A CN 114455895 A CN114455895 A CN 114455895A CN 202210180500 A CN202210180500 A CN 202210180500A CN 114455895 A CN114455895 A CN 114455895A
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- China
- Prior art keywords
- cement slurry
- plugging
- density
- cement
- layer
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
Abstract
The invention relates to the technical field of oil field well repair, in particular to a three-body cement slurry for repairing a tail pipe of a heavy oil well in well operation. The three-body cement slurry comprises plugging cement slurry, thixotropic cement slurry and high-density cement slurry, wherein the plugging cement slurry is used for plugging a leaking layer, the plugging cement slurry contains 10% by mass of plant expansion fibers, the diameters of the plant expansion fibers are 3-6mm, the water loss of the plugging cement slurry is 500-700mL/30min, the consistency is 35-40BC, and the density is 1.75-1.80g/cm3. The invention realizes the plugging of the leakage layer, prevents cement paste from returning during well cementation, stabilizes the quicksand layer to prevent quicksand from gathering, balances the pressure of the high-pressure water layer and prevents formation water from entering a shaft.
Description
The technical field is as follows:
the invention relates to the technical field of oil field well repair, in particular to a three-body cement slurry for repairing a tail pipe of a heavy oil well in well operation.
Background art:
at present, the existing heavy oil thermal recovery well has the characteristics that:
1. the permeability of the mining layer is high, the stratum framework is cemented and loosened, and more sand is produced, so that a cavity is formed underground.
2. And (5) loss due to the lack of the oil production layer.
3. Shallow oil reservoir burial, low stratum fracture pressure and easy channeling between two wells.
4. There is a high pressure water layer channeling.
5. And (4) sand production, aggregation and precipitation of the quicksand layer.
At present, the prior solid tail pipe has the following problems:
1. loss of oil due to oil reservoir depletion.
2. The water layer is high pressure water channeling.
3. The oil reservoir is buried shallowly, the pressure coefficient of a shaft is large, and the cement slurry pressure is difficult to balance the stratum during well cementation.
The invention content is as follows:
the invention aims to solve the technical problem of providing the three-body cement slurry for the tail pipe fixing of the heavy oil well in the well repairing operation, wherein the three-body cement slurry realizes the plugging of a leakage layer, prevents the cement slurry from returning in the well cementation process, stabilizes a flowing sand layer to prevent the flowing sand from gathering, balances the pressure of a high-pressure water layer and prevents formation water from entering a shaft. The problems that leakage is not returned when a high-permeability leakage layer in an open hole section is used for cementing, sand is produced from a sand flowing layer and accumulated to be blocked when a pump is stopped and the pump is stopped intermittently, the stratum is blocked, water flows are discharged from a high-pressure water injection water channeling layer, and cement slurry is dispersed and diluted in the conventional thickened oil side drilling and tail pipe fixing process are solved.
The technical scheme adopted by the invention is as follows: the three-body cement slurry for repairing the tail pipe of the heavy oil well comprises plugging cement slurry, thixotropic cement slurry and high-density cement slurry, wherein the plugging cement slurry is used for plugging a leaking layer, the plugging cement slurry contains 10% by mass of plant expansion fibers, the diameters of the plant expansion fibers are 3-6mm, the water loss of the plugging cement slurry is 500-700mL/30min, the consistency is 35-40BC, and the density is 1.75-1.80g/cm3；
The thixotropic cement paste is used for stabilizing a fluid sand layer, the thixotropic cement paste has a touch value of 3-6Pa and a density of 1.85-1.90g/cm3；
The high-density cement slurry is used for balancing the pressure of the high-pressure water layer, and the density range of the high-density cement slurry is 1.70-2.60g/cm3。
Furthermore, the leaking stoppage cement slurry enters the leaking stoppage layer, then the leaking stoppage cement slurry meets the requirement of shaft pressure balance during well cementation, and if the leaking stoppage cement slurry is a mining layer, the leaking stoppage cement slurry also meets the mining requirement, namely the leaking stoppage cement slurry has permeability after being solidified.
Further, the thixotropic cement slurry meets the requirements of a shaft pressure system.
The invention has the beneficial effects that: the invention realizes the plugging of the leakage layer, prevents cement paste from returning during well cementation, stabilizes the quicksand layer to prevent quicksand from gathering, balances the pressure of the high-pressure water layer and prevents formation water from entering a shaft.
The specific implementation mode is as follows:
is used forThe three-body cement slurry for the tail pipe fixing of the heavy oil well in the well repairing operation comprises plugging cement slurry, thixotropic cement slurry and high-density cement slurry, wherein the plugging cement slurry is used for plugging a leakage layer and preventing cement slurry from returning during well cementation, the plugging cement slurry contains 10% by mass of plant expansion fibers, the diameters of the plant expansion fibers are 3-6mm, the water loss of the plugging cement slurry is 700mL/30min, the consistency is 35-40BC, and the density is 1.75-1.80g/cm3(ii) a The leaking stoppage cement slurry enters the leaking stoppage layer, and then the leaking stoppage cement slurry meets the requirement of shaft pressure balance during well cementation, and if the leaking stoppage cement slurry is a mining layer, the leaking stoppage cement slurry also meets the mining requirement, namely the leaking stoppage cement slurry has permeability after being solidified.
The thixotropic cement paste is used for stabilizing a quicksand layer and preventing quicksand from gathering, the thixotropic cement paste has a thixotropic value of 3-6Pa and a density of 1.85-1.90g/cm3(ii) a The thixotropic cement paste meets the requirements of a shaft pressure system besides preventing quicksand from gathering during well cementation.
The high-density cement slurry is used for balancing the pressure of a high-pressure water layer and preventing formation water from entering a shaft, and the density range of the high-density cement slurry is 1.70-2.60g/cm3。
Example 1
No. 14 No. 1 month in 2022, Du 84-42-117 wells adopt the three-body cement slurry cementing tail pipe of the invention, and the success is fully achieved. The detection shows that the qualified rate of the well cementation quality is one hundred percent, and the full-quality rate is ninety-three percent.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (3)
1. A three-body cement slurry for repairing the well and fixing the tail pipe of a heavy oil well is characterized in that: the three-body cement paste comprises leaking stoppage cement paste, thixotropic cement paste and high-density cement paste, wherein the leaking stoppage cement paste is used for plugging a leaking layerThe plugging cement slurry contains 10 mass percent of plant expansion fibers, the diameter of the plant expansion fiber particles is 3-6mm, the water loss of the plugging cement slurry is 500-700mL/30min, the consistency is 35-40BC, and the density is 1.75-1.80g/cm3；
The thixotropic cement paste is used for stabilizing a fluid sand layer, the thixotropic cement paste has a thixotropic value of 3-6Pa and a density of 1.85-1.90g/cm3；
The high-density cement slurry is used for balancing the pressure of the high-pressure water layer, and the density range of the high-density cement slurry is 1.70-2.60g/cm3。
2. The three-body cement slurry for cementing a liner for a heavy oil well for workover operations according to claim 1, wherein: the leaking stoppage cement slurry enters the leaking stoppage layer, and then the leaking stoppage cement slurry meets the requirement of shaft pressure balance during well cementation, and if the leaking stoppage cement slurry is a mining layer, the leaking stoppage cement slurry also meets the mining requirement, namely the leaking stoppage cement slurry has permeability after being solidified.
3. The three-body cement slurry for cementing tail pipes of heavy oil wells for workover operations according to claim 1, wherein: the thixotropic cement paste meets the requirements of a shaft pressure system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210180500.2A CN114455895A (en) | 2022-02-25 | 2022-02-25 | Three-body cement slurry for repairing operation heavy oil well tail pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210180500.2A CN114455895A (en) | 2022-02-25 | 2022-02-25 | Three-body cement slurry for repairing operation heavy oil well tail pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114455895A true CN114455895A (en) | 2022-05-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210180500.2A Pending CN114455895A (en) | 2022-02-25 | 2022-02-25 | Three-body cement slurry for repairing operation heavy oil well tail pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114455895A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1865185A (en) * | 2005-05-21 | 2006-11-22 | 新疆石油管理局钻井工艺研究院 | High density concrete slurry |
| CN101857800A (en) * | 2010-06-28 | 2010-10-13 | 西南石油大学 | Leaking stoppage cement slurry for well cementation and preparation method thereof |
| CN103045214A (en) * | 2013-01-16 | 2013-04-17 | 西南石油大学 | Plugging thixotropic cement paste for oil-gas well and preparation method for same |
| CN107200520A (en) * | 2017-06-28 | 2017-09-26 | 四川宏升石油技术开发有限责任公司 | Deep well cementing weighted cement slurry system |
| CN109868125A (en) * | 2017-12-04 | 2019-06-11 | 中国石油化工股份有限公司 | A kind of deep drilling well high bearing strength sealing agent and preparation method thereof |
| CN111825355A (en) * | 2019-09-12 | 2020-10-27 | 尧柏特种水泥技术研发有限公司 | Low-thixotropy oil well cement |
-
2022
- 2022-02-25 CN CN202210180500.2A patent/CN114455895A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1865185A (en) * | 2005-05-21 | 2006-11-22 | 新疆石油管理局钻井工艺研究院 | High density concrete slurry |
| CN101857800A (en) * | 2010-06-28 | 2010-10-13 | 西南石油大学 | Leaking stoppage cement slurry for well cementation and preparation method thereof |
| CN103045214A (en) * | 2013-01-16 | 2013-04-17 | 西南石油大学 | Plugging thixotropic cement paste for oil-gas well and preparation method for same |
| CN107200520A (en) * | 2017-06-28 | 2017-09-26 | 四川宏升石油技术开发有限责任公司 | Deep well cementing weighted cement slurry system |
| CN109868125A (en) * | 2017-12-04 | 2019-06-11 | 中国石油化工股份有限公司 | A kind of deep drilling well high bearing strength sealing agent and preparation method thereof |
| CN111825355A (en) * | 2019-09-12 | 2020-10-27 | 尧柏特种水泥技术研发有限公司 | Low-thixotropy oil well cement |
Non-Patent Citations (1)
| Title |
|---|
| 郑雄周等: "《实用毛织物手册》", 30 April 1987 * |
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Application publication date: 20220510 |
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