High strength and low density oil well cement

A technology of oil well cement and low density, applied in the field of oil well cement, can solve problems such as low strength, poor rheological properties, and difficult control of thickening time, and achieve good performance, overcome poor uniformity, and controllable thickening time

Active Publication Date: 2006-01-18
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of low strength, poor rheological properties, and difficult control of thickening time in the existing technology when the density of cement slurry is reduced, thereby improving the quality of oilfield cementing and reducing the risk of oilfield cementing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, the composition of high-strength and low-density oil well cement is: oil well cement 62.5%, lightening material (15% fly ash+10% floating beads) 24%, cement slurry stabilizer 9.8%, externally mixed strengthening agent 2.9% (using In the case of SK-2 early strength agent produced by Sikai Fine Chemical Factory in Mianyang High-tech Zone, Sichuan), 0.8% of dispersant (the SPF dispersant produced by West China Sichuan Pengshan Concrete Admixture Co., Ltd.), the high strength and low density of this composition The physical performance of the oil well cement is tested, the strength (under the condition of 45°C×21MPa×24h) is 28Mpa, the fluidity is 25cm, the thickening time (45°C×30Mpa×20mim temperature rise) is 110min, the rheological properties n=0.7, p= 0.52.

Embodiment 2

[0018] Embodiment 2 is composed of: oil well cement 38.8%, lightening material (fly ash) 43.7%, cement slurry stabilizer 14.5%, externally mixing reinforcing agent 2.5% (SK-2 early strength agent), dispersant 0.5% (SPF In the case of dispersant), the water-cement ratio is controlled to be 0.60. According to the physical performance test, the strength (under the condition of 45℃×21MPa×24h) is 23Mpa, the fluidity is 26cm, and the thickening time (45℃×30Mpa×20mim temperature rise) is 135min, rheological properties n=0.7, p=0.52.

Embodiment 3

[0019] Embodiment 3 is composed of: oil well cement 52.7%, lightening material (23.7% fly ash+10% floating beads) 33.7%, cement slurry stabilizer 9.6%, externally mixed reinforcing agent (SK-2 early strength agent) 3.5% 1. When the dispersant (SPF dispersant) is 0.5, the water-cement ratio is controlled to 0.50. According to the physical performance test, the strength (under the condition of 45℃×21MPa×24h) is 31Mpa, the fluidity is 26cm, and the thickening time (45℃×24h) is 31Mpa. 30Mpa×20mim heating) is 152min, rheological properties n=0.8, p=0.26.

[0020] The indicators of the above examples all exceed the standard requirements, the service performance is good, and the cementing quality is excellent.

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Abstract

The high strength and low density oil well reinforcing cement has cement mortar density of 1.60 g/cu cm, and consists of oil well cement, weight reducing material, cement mortar stabilizer and admixture. It has optimized material composition, high early stage strength, improved rheologic performance and controllable thickening time, and meets the requirement for reinforcing low stratum pressure oil well.

Description

technical field [0001] The invention relates to oil well cement, in particular to a cement slurry with a density of 1.60±0.02g / cm 3 , High-strength and low-density oil well cement for oilfield cementing. Background technique [0002] At present, many formations in the oilfield have low pressure and active gas formations, and there are technical problems of cementing loss and annular air channeling in the oilfield cementing operation. Conventional cementing methods will not only easily cause well leakage, seriously affect the cementing quality, but also damage the formation, Contaminate oil reservoirs and reduce oil production. [0003] There are two main methods to solve oilfield cementing leakage, one is to use two-stage or multi-stage cementing; the other is to use lightening agent materials to reduce the density of cement slurry. The former is not only more complicated in construction, but also takes a long time to drill. Although the latter is the direction of current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/00C04B18/08
CPCY02W30/91
Inventor 阳运霞陈绍华韩建国钟文周军
Owner JIAHUA SPECIAL CEMENT
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