Oil well cement resistant to strength retrogression at high temperature and production method thereof

A technology of oil well cement and strength, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of strength reduction, cement stone strength attenuation, and cement stone strength destruction, so as to achieve non-fading strength and high embankment compactness , the effect of delaying the time of hydration reaction

Pending Publication Date: 2018-11-06
葛洲坝石门特种水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] High content of C in the prior art 3 S, low C 2 S grade G oil well cement has a short thickening time and reduced strength under high temperature and high pressure conditions. When the temperature exceeds 110°C, the strength of cement stones will attenuate. The higher the temperature, the greater the attenuation, and even destroy the strength of cement stones.
The thickening time of cement slurry is shortened, which will cause clogging, which is difficult to meet the cementing requirements, and even cause large economic losses to the oil field

Method used

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  • Oil well cement resistant to strength retrogression at high temperature and production method thereof
  • Oil well cement resistant to strength retrogression at high temperature and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Prepare oil well cement clinker according to conventional methods, and control the mineral composition of cement clinker to be C 3 S at 10~25%, C 2 S at 50~65%, C 3 A at 0~3%, C 4 AF at 12~15%;

[0024] (2) The oil well cement clinker, gypsum and retarder are put into the grinding together according to the ratio. The ratio is that the oil well cement clinker accounts for 95% of the mass, the gypsum accounts for 4% of the mass, and the retarder is 1%. The specific area of ​​grinding is 150-220cm² / kg, 0.080mm sieve, 13-20%, SO 3 Clinker powder with a content of 1.5~3.0%;

[0025] (3) Separately grind the silica sand into two kinds of powders with different fineness, that is, silica sand powder 1 with a 0.045mm sieve residue of 4-6% and 0.045mm sieve residue with a 15-25% silica sand powder 2, and then step (2) The prepared clinker powder, silica sand powder 1, and silica sand powder 2 are mixed according to the mass percentage of cement clinker powder 70%, silica...

Embodiment 2

[0028] (1) Prepare oil well cement clinker according to conventional methods, and control the mineral composition of cement clinker to be C 3 S at 10~25%, C 2 S at 50~65%, C 3 A at 0~3%, C 4 AF at 12~15%;

[0029] (2) The oil well cement clinker, gypsum and retarder are put into the grinding together according to the proportion, the proportion is 95% of oil well cement clinker, 4% of gypsum and 1 / % of retarder, and the specific area of ​​grinding is 150-220cm² / kg, 0.080mm sieve, 13-20%, SO 3 Clinker powder with a content of 1.5~3.0%;

[0030] (3) Separately grind the silica sand into two kinds of powders with different fineness, that is, silica sand powder 1 with a 0.045mm sieve residue of 4-6% and 0.045mm sieve residue with a 15-25% silica sand powder 2, and then step (2) The prepared clinker powder, silica sand powder 1, and silica sand powder 2 are mixed according to the mass percentage of cement clinker powder 65%, silica sand powder 1 17.5%, and silica sand powder 2 ...

Embodiment 3

[0033] (1) Prepare oil well cement clinker according to conventional methods, and control the mineral composition of cement clinker to be C 3 S at 10~25%, C 2 S at 50~65%, C 3 A at 0~3%, C 4 AF at 12~15%;

[0034] (2) The oil well cement clinker, gypsum and retarder are put into the grinding together according to the proportion, the proportion is 95% of oil well cement clinker, 4% of gypsum and 1 / % of retarder, and the specific area of ​​grinding is 150-220cm² / kg, 0.080mm sieve, 13-20%, SO 3 Clinker powder with a content of 1.5~3.0%;

[0035] (3) Separately grind the silica sand into two kinds of powders with different fineness, that is, silica sand powder 1 with a 0.045mm sieve residue of 4-6% and 0.045mm sieve residue with a 15-25% silica sand powder 2, and then step (2) The prepared clinker powder, silica sand powder 1, and silica sand powder 2 are mixed according to the mass percentage of 50% of cement clinker powder, silica sand powder 1 25%, and silica sand powder 2...

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Abstract

The invention discloses oil well cement resistant to strength retrogression at high temperature and a production method thereof. The oil well cement is prepared from, by mass, 35%-70% of cement clinker powder and 30%-65% of silica sand, wherein the cement clinker powder is prepared from, by mass, 90%-95% of oil well cement clinker, 2%-4% of gypsum and 1%-3% of retarder. The oil well cement does not produce strength retrogression under the conditions of high temperature and high pressure, but the strength is improved certainly, and the cement has good durability and is conductive to improvementof well cementation quality of an oilfield extra-deep well.

Description

technical field [0001] The invention relates to an oil well cement capable of resisting strength attenuation under high temperature and a production method thereof, belonging to the technical field of special cement production. Background technique [0002] Oil well cement is widely used in the exploration and production of oil and natural gas. During the construction process, oil well cement is mainly used as an annular seal between the inner wall of the borehole and the steel casing to separate the area with high pressure from the area with low pressure. Drilling success plays an important role. With the improvement of drilling technology and the increasing difficulty of oilfield production, drilling has developed into deep wells, ultra-deep wells, and complex wells. The temperature and pressure at the bottom of the well have increased significantly. [0003] High content of C in the prior art 3 S, low C 2 S grade G oil well cement has a short thickening time and reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C09K8/467C04B111/20
CPCC04B28/14C04B2111/20C04B2201/50C09K8/467C04B2103/22C04B14/06
Inventor 覃爱平
Owner 葛洲坝石门特种水泥有限公司
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