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
5 Cites 10 Cited by

AI-Extracted 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...
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Method used

Early strength agent of the present invention is compounded by inorganic salt sodium thiosulfate, basic aluminum chloride, sodium nitrate, micro silicon, calcium sulfate. Sodium thiosulfate is cheap, which can reduce production costs; basic aluminum chloride solves the problem of increasing dynamic shear force, plastic vis...
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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.

Application Domain

Technology Topic

AluminiumAluminate +10

Image

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

Examples

  • Experimental program(8)

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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PUM

PropertyMeasurementUnit
Compressive strength16.78mPa
Compressive strength13.792mPa
Compressive strength2.4mPa
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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