A kind of cement slurry for hydrate cementing and its preparation method

A kind of cement slurry and hydrate technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of long thickening time and inability to guarantee, and achieve the effect of reducing waiting time and fast strength.

Active Publication Date: 2022-03-29
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above cement slurries have good strength development at low temperature, but they cannot guarantee a longer thickening time at a higher temperature of 30°C

Method used

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  • A kind of cement slurry for hydrate cementing and its preparation method
  • A kind of cement slurry for hydrate cementing and its preparation method
  • A kind of cement slurry for hydrate cementing and its preparation method

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preparation example Construction

[0041] In the second aspect, the embodiment of the present invention also provides a method for preparing cement slurry for hydrate cementing related to the first aspect, the preparation method comprising the following steps:

[0042] Step a, mixing the oil well cement, lightening reinforcement material, drag reducer, and expansion agent evenly to form a dry mixture,

[0043] Step b, mixing the enhancer and water to form a mixed liquid;

[0044] Step c. Uniformly mixing the dry mixture and the mixing solution to form cement slurry.

[0045]The cement slurry prepared by the method provided in the embodiment of the present invention can be used for the cementing of hydrates in sea areas with a temperature of 4-30°C through the synergistic compounding of the above-mentioned components. The thickening time of the cement slurry is It can meet the safety construction requirements at 30°C, and the strength develops faster at a low temperature of 4°C, reducing the waiting time for se...

Embodiment 1

[0048] This example provides a cement slurry for hydrate cementing, which is prepared by the following components in weight ratio: 100 parts of oil well cement, 0.5 part of drag reducer, 0.5 part of expansion agent, 3 parts of reinforcing agent and 43 parts of water. The density of the cement slurry prepared by this formula is 1.90g / cm 3 .

Embodiment 2

[0050] This example provides a cement slurry for hydrate cementing, which is prepared by the following components in weight ratio: 100 parts of oil well cement, 10 parts of lightening and reinforcing materials, 0.3 parts of drag reducer, 1.5 parts of expansion agent, 2 parts enhancer and 45 parts water. The density of the cement slurry prepared by this formula is 1.80g / cm 3 .

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Abstract

The invention discloses a cement slurry used for hydrate well cementing and a preparation method thereof, belonging to the field of well cementing operations. The cement slurry is prepared by the following components in weight ratio: 100 parts of oil well cement, 0-60 parts of lightening and reinforcing materials, 0.1-1.0 parts of drag reducer, 0.5-1.5 parts of expansion agent, 2-7 parts of reinforcing agent and 43- 80 parts of water; wherein, the lightening and reinforcing material is prepared by the following components by weight ratio: 50 parts of hollow microspheres, 35 parts of ultrafine cement, 5 parts of nano calcium carbonate, and 10 parts of ultrafine metakaolin. Through the synergistic compounding of the above-mentioned components in the embodiment of the present invention, the prepared cement slurry can be used for cementing wells in the exploitation of hydrates in sea areas with a temperature of 4-30°C, and the thickening time of the cement slurry can meet the safety requirements at 30°C. Construction requirements, the strength develops faster at a low temperature of 4°C, reducing the waiting time for setting; and after the cement slurry solidifies, it can meet the requirements for supporting wellhead devices and annular space sealing.

Description

technical field [0001] The invention relates to the field of well cementing operations, in particular to a cement slurry for hydrate well cementing and a preparation method thereof. Background technique [0002] The cementing operation during hydrate exploitation is the prerequisite and important guarantee for the effective exploration and development of hydrate resources. The annulus of hydrate cementing is large, and plug flow or near plug flow is generally used to replace it. The construction time is long, and the cement slurry needs to have enough pumping time to meet the safe construction, which requires the cement slurry to be operated at a higher temperature (such as 30°C). It has a longer thickening time and develops strength quickly at low temperature (eg 4°C). [0003] Currently, there are many cement slurries that can be used for hydrate cementing. For example, the patent application number 201710010738.X discloses a low-density cement slurry system for deep-wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C09K8/467
CPCC04B28/026C09K8/467C04B2111/00008C04B2201/20C04B2111/00724C04B2201/50C04B20/002C04B7/00C04B14/28C04B14/106C04B24/30C04B22/148C04B22/06C04B24/121C04B22/124C04B22/085
Inventor 席方柱孙富全杨昆鹏刘爱萍王友华宋本岭黄志刚熊钰丹李鹏晓石凌龙
Owner BC P INC CHINA NAT PETROLEUM CORP
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