Medium high temperature early strength agent for oil well cement

An oil well cement, medium and high temperature technology, applied in the field of oil well cement early strength agent, can solve the problems of obvious thickening time, low applicable temperature, long production time, etc., to reduce API water loss, improve early strength, and high production efficiency Effect

Active Publication Date: 2012-07-04
成都欧美克石油科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. Various raw materials, long production time and low efficiency;
[0008] 2. The applicable temperature is low, mainly

Method used

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  • Medium high temperature early strength agent for oil well cement
  • Medium high temperature early strength agent for oil well cement

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1:

[0027] A high temperature early strength agent for oil well cement, which contains the following components, and the weight ratio of each component is:

[0028] Sodium thiosulfate 2.8,

[0029] Basic aluminum chloride 0.2,

[0030] Sodium nitrate 0.4,

[0031] Micro silicon 0.4,

[0032] Calcium aluminate 0.2.

[0033] The high-temperature early-strength agent in the oil well cement prepared according to the above formula and the cement were sampled at a weight ratio of 4:100 to prepare samples. The compressive strength of the sample under the conditions of a curing temperature of 61°C and a curing time of 8 hours is 16.78MPa; this embodiment is the best embodiment of the present invention.

Example Embodiment

[0034] Example 2:

[0035] A high temperature early strength agent for oil well cement, which contains the following components, and the weight ratio of each component is:

[0036] Sodium thiosulfate 1.2,

[0037] Basic aluminum chloride 1.2,

[0038] Sodium nitrate 0.6,

[0039] Micro silicon 1.

[0040] The high-temperature early-strength agent in the oil well cement prepared according to the above formula and the cement were sampled at a weight ratio of 4:100 to prepare samples. The compressive strength of the sample under the conditions of a curing temperature of 61°C and a curing time of 8 hours is 13.792MPa.

Example Embodiment

[0041] Example 3:

[0042] A high temperature early strength agent for oil well cement, which contains the following components, and the weight ratio of each component is:

[0043] Sodium thiosulfate 1.2,

[0044] Basic aluminum chloride 2,

[0045] Sodium nitrate 0.4,

[0046] Micro silicon 0.2,

[0047] Calcium aluminate 0.2.

[0048] The high-temperature early-strength agent in the oil well cement prepared according to the above formula and the cement were sampled at a weight ratio of 4:100 to prepare samples. The compressive strength of the sample under the conditions of a curing temperature of 61°C and a curing time of 8 hours is 2.4MPa.

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Abstract

The invention discloses a medium high temperature early strength agent for oil well cement. The medium high temperature early strength agent for the oil well cement comprises the following components in part by weight: 1.2 to 2.8 parts of sodium thiosulfate, 0.2 to 2 parts of basic aluminum chloride, 0.2 to 0.6 part of sodium nitrate, 0.2 to 1 part of microsilicon and 0 to 0.2 part of calcium aluminate. The medium high temperature early strength agent for the oil well cement has the beneficial effects that: the early strength of cement stone can be improved obviously at high temperature on the premise of not influencing the thickening time; the problem that the early strength of the cement stone is developed slowly at medium high temperature is solved; the medium high temperature early strength agent has high compatibility with other additives; and at medium temperature, water loss of cement paste can be controlled, the adding amount of a fluid loss agent is reduced, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of early-strength agents for oil well cement, in particular to a medium-temperature early-strength agent for oil well cement. Background technique [0002] With the deepening of oil and gas exploration and development, there are more and more wells with long sealing and large temperature difference. Most of these wells use one-time cementing, and the construction time is long, which requires the cement slurry to have long thickening time and high top strength. . The thickening time of cement slurry determines the amount of retarder added, and the addition of most retarders will naturally affect the development of top strength. [0003] Commonly used early strength agents include inorganic salts and organic compounds. Among inorganic salts, chloride is the most commonly used early strength agent for oil well cement. Others such as carbonates, silicates, aluminates, thiosulfates and sodium The hydroxides of ...

Claims

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Application Information

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IPC IPC(8): C09K8/467
Inventor 李勇卢成辉祝成史芳芳
Owner 成都欧美克石油科技股份有限公司
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