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Quick-hardening earyly-strenthening cement for oil well

An oil well cement and mineral technology, applied in the field of cement, can solve the problems of difficult to guarantee the cementing quality, large on-site construction workload, easy interference with cement slurry cementation, etc., and achieve the effect of shortening the cementing period, high early strength and high strength

Inactive Publication Date: 2007-02-07
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, A-grade oil well cement is commonly used in oilfield surface cementing and shallow well cementing. In order to meet the cementing requirements of oil wells, the method of adding various admixtures to oil well cement is often used, and this method makes the on-site construction workload heavy. , The process is complex and complicated, the cementing period is long, and the cementing cost is greatly increased (the value of the admixture used in the general oilfield cementing is almost equal to the value of the cement used in the cementing). Under special geological conditions, the existing oil well cement and Well cementing method, its cementing quality is difficult to guarantee
For example, the Cementing Engineering Department of Zhongyuan Petroleum Exploration Bureau provided the situation of using the existing G-grade and A-grade oil well cement and well cementing methods in the Songyuan area of ​​Jilin Province, my country. Because there are many water injection wells around the Songyuan area, although before the cementing Closed, but not depressurized, in a static state, high pressure water can easily interfere with the cementation of the cement slurry, resulting in poor cementing quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mineral composition: tricalcium silicate (C 3 S) 50.44%, tricalcium aluminate (C 3 A) 7.67%, sulfur trioxide (SO 3 ) 1.94%, dicalcium silicate (C 2 S) 26.03%, tetracalcium aluminoferrite (C 4 AF) 10.18%, and the rest are trace elements such as magnesium oxide, titanium oxide, and alkali content.

[0018] The rapid-hardening early-strength oil well cement produced according to this component, under the conditions of 0.44 water-cement ratio, 40°C, 20MPa, and 20 minutes of heating, the initial consistency is 20.0BC in 15 to 30 minutes, and the thickening time is 129 minutes; Under the conditions of water-cement ratio and normal pressure, the compressive strength of 38°C and 8 hours is 7.5MPa, and the compressive strength of 24 hours is 18.5MPa; under the conditions of water-cement ratio of 0.44, normal temperature and normal pressure, the free liquid of cement slurry is 0.2ml.

[0019] Add 1.5% early strength agent (choose CaCl 2 ):

[0020] Under the conditions of ...

Embodiment 2

[0022] Mineral composition: tricalcium silicate (C 3 S) 53.54%, tricalcium aluminate (C 3 A) 7.49%, sulfur trioxide (SO 3 ) 2.21%, dicalcium silicate (C 2 S) 21.59%, tetracalcium aluminoferrite (C 4 A F) 10.12%, the rest are trace elements such as magnesium oxide, titanium oxide, alkali content, and 1.0% limestone.

[0023] The rapid-hardening early-strength oil well cement produced according to this component, under the conditions of 0.44 water-cement ratio, 40°C, 20MPa, and 20 minutes of heating, the initial consistency is 15.0BC in 15 to 30 minutes, and the thickening time is 121 minutes; at 0.44 Under the conditions of water-cement ratio and normal pressure, the compressive strength of 38 ℃ and 8 hours is 8.0MPa, and the compressive strength of 24 hours is 20.5MPa; under the conditions of water-cement ratio of 0.44, normal temperature and normal pressure, the free liquid of cement slurry is 0.6ml.

[0024] Add 2.0% early strength agent (choose CaCl 2 ):

[0025] Und...

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Abstract

The present invention is characterized by that it is formed from mineral components of tricalcium silicate, tricalcium aluminate, sulful trioxide, dicalcium silicate and tetracalcium iron columinate, when the cement is used, the early-strength agent can be added, and when the clinker prepared and roasted according to the requirements for cement composition is used for grinding to prepare cement, the additive can be added. As compared with existent other oil well cemkent said oil well cement has the excellent performances of high early strength, low water loss, slight expansion and short setting time, etc.

Description

technical field [0001] The invention relates to cement, in particular to a rapid-hardening early-strength oil well cement which can be used for oil field surface layer and shallow layer cementing. Background technique [0002] At present, A-grade oil well cement is commonly used in oilfield surface cementing and shallow well cementing. In order to meet the cementing requirements of oil wells, the method of adding various admixtures to oil well cement is often used, and this method makes the on-site construction workload heavy. , The process is complex and complicated, the cementing period is long, and the cementing cost is greatly increased (the value of the admixture used in the general oilfield cementing is almost equal to the value of the cement used in the cementing). Under special geological conditions, the existing oil well cement and Well cementing method, its cementing quality is difficult to guarantee. For example, the Cementing Engineering Department of Zhongyuan ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/02C04B22/08C04B24/12
Inventor 王玉强阳运霞韩建国周军
Owner JIAHUA SPECIAL CEMENT
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