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Cement reinforcing agent suitable for deepwater low-temperature environment, preparation method thereof and cement paste system

A cement enhancer, low-temperature environment technology, applied in chemical instruments and methods, drilling compositions, silicates, etc., can solve problems such as insufficiently meeting the needs of deep water cementing, and achieve improved operation efficiency and safety. Good fluidity and the effect of reducing waiting time

Inactive Publication Date: 2021-07-30
ZHANJIANG BRANCH OF CHINA NATIONAL OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previous studies have shown that due to the crystal nucleus effect, the addition of C-S-H seeds can improve the mechanical properties of cement-based materials. However, the enhanced performance of C-S-H seeds at low temperature is not enough to meet the needs of deep water cementing.

Method used

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  • Cement reinforcing agent suitable for deepwater low-temperature environment, preparation method thereof and cement paste system
  • Cement reinforcing agent suitable for deepwater low-temperature environment, preparation method thereof and cement paste system
  • Cement reinforcing agent suitable for deepwater low-temperature environment, preparation method thereof and cement paste system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A cement reinforcing agent suitable for deep water and low temperature environment, prepared by the following preparation method:

[0047] S1: Na 2 SiO 3 9H 2 O dissolved in deionized water to make 1.0mol / L Na 2 SiO 3 solution; the Ca(NO 3 ) 2 4H 2 O dissolved in deionized water to make 1.0mol / L Ca(NO 3 ) 2 solution; KAl(SO 4 ) 2 12H 2 O was dissolved in deionized water to make 0.5mol / L KAl(SO 4 ) 2 solution;

[0048] S2: The prepared Ca(NO 3 ) 2 Add the solution into a three-necked flask, put the three-necked flask into a water bath at 60°C, insert a stirring rod and set the speed at 500r / min, and adjust the pH value of the solution to 11-13;

[0049] S3: Na 2 SiO 3 solution with KAl(SO 4 ) 2 The solution was added dropwise into a three-necked flask respectively, and the rate of addition was controlled at 2 drops / s. After 7 days of reaction, the pH of the mixed solution was regularly adjusted to be 13; the Na 2 SiO 3 solution, Ca(NO 3 ) 2 soluti...

Embodiment 2

[0052] A cement slurry system, comprising the following components in parts by mass: 400 parts of G grade oil well cement, 12 parts of cement reinforcing agent in Example 1, 12 parts of fluid loss reducer, 4.8 parts of dispersant, defoamer 2 parts, 180 parts of mixing water.

[0053] The cement slurry system is prepared by the following preparation method: dry-mix the G-grade oil well cement and the cement reinforcing agent uniformly, and uniformly mix the liquid admixture (water loss reducer, dispersant, defoamer) with the slurry preparation water, Then prepare cement slurry with the obtained aqueous solution and dry-mixed powder according to GB / T 19139 "Test Methods for Oil Well Cement".

Embodiment 3

[0055] A cement slurry system, including the following components in parts by mass: 400 parts of G-grade oil well cement, 20 parts of cement reinforcing agent in Example 1, 12 parts of fluid loss reducer, 4.8 parts of dispersant, defoamer 2 parts, 182 parts of pulping water.

[0056] The cement slurry system is prepared by the following preparation method: dry-mix the G-grade oil well cement and the cement reinforcing agent uniformly, and uniformly mix the liquid admixture (water loss reducer, dispersant, defoamer) with the slurry preparation water, Then prepare cement slurry with the obtained aqueous solution and dry-mixed powder according to GB / T 19139 "Test Methods for Oil Well Cement".

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Abstract

The invention discloses a cement reinforcing agent suitable for a deepwater low-temperature environment, a preparation method of the cement reinforcing agent and a cement paste system, the cement reinforcing agent is aluminum-doped hydrated calcium silicate, and the molar ratio of aluminum to silicon to calcium in the aluminum-doped hydrated calcium silicate is as follows: the molar ratio of Ca to Si is 1.5-2.0, and the molar ratio of Al to Si is 0.08-0.15. The early strength of the set cement under the deepwater low-temperature condition can be improved, and the problems that the strength development of the set cement in the low-temperature environment is slow, and construction safety is affected are solved. By adding Al ions for improving the structure of the C-S-H seed crystal, the early strength performance of the C-S-H seed crystal is greatly improved. The cement reinforcing agent has a good effect of improving the low-temperature mechanical compressive strength of the oil well cement stone, is suitable for a deepwater low-temperature environment, can effectively improve the early compressive strength of oil well cement, and guarantees the safety of operation construction.

Description

technical field [0001] The invention relates to the technical field of cement admixtures, in particular to a cement reinforcing agent suitable for deep-water low-temperature environments, a preparation method thereof, and a cement slurry system. Background technique [0002] With the increasing dependence and demand of human society on energy, oil and gas exploration and development have gradually tended to deep water and ultra-deep water areas, and related research has become the focus of people's attention. During the exploration and development of deepwater and ultra-deepwater oil and gas resources, the marine environment has the characteristics of low temperature, shallow flow and low formation fracture pressure. The early strength of cement stone is low, and the cement stone in the annular space cannot achieve sufficient shear stress to support the weight of the casing in a short period of time, resulting in prolonged waiting time for cementing construction, which canno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08C01B33/26C04B28/00C09K8/46C09K8/467C04B111/74
CPCC04B22/00C01B33/26C04B28/00C09K8/46C09K8/467C04B2111/00724C04B2111/74
Inventor 刘书杰黄熠刘和兴王成龙彭志刚郑勇毛宇航
Owner ZHANJIANG BRANCH OF CHINA NATIONAL OFFSHORE OIL CORP
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