Oil well cement low-temperature composite early-strong coagulation accelerator

A technology of oil well cement and coagulation accelerator, which is applied in the field of cement low-temperature coagulation accelerator, can solve the problems of poor effect and failure to achieve cementing operations, etc., and achieve the effect of improving early strength, coagulation acceleration and high compressive strength

Inactive Publication Date: 2015-07-15
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using these inorganic or organic early-strength coagulants alone

Method used

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  • Oil well cement low-temperature composite early-strong coagulation accelerator
  • Oil well cement low-temperature composite early-strong coagulation accelerator
  • Oil well cement low-temperature composite early-strong coagulation accelerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The low-temperature composite early-strength coagulant for oil well cement is prepared by uniformly mixing 0.5 parts by weight of calcium sulfate, 0.25 parts by weight of sodium silicate, 1 part by weight of calcium formate, 0.06 parts by weight of triethanolamine and 0.3 parts by weight of oxalic acid.

Embodiment 2

[0027] 0.5 parts by weight of calcium sulfate, 0.3 parts by weight of sodium silicate, 0.6 parts by weight of ferric lactate, 0.06 parts by weight of diethanolamine and 0.3 parts by weight of formic acid are evenly mixed to prepare the low-temperature composite early-strength coagulant for oil well cement.

Embodiment 3

[0029] 0.5 parts by weight of calcium sulfate, 0.5 parts by weight of sodium silicate, 1.5 parts by weight of calcium formate, 0.06 parts by weight of triethanolamine and 0.3 parts by weight of oxalic acid are uniformly mixed to prepare the low-temperature composite early-strength coagulant for oil well cement.

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Abstract

The invention discloses an oil well cement low-temperature composite early-strong coagulation accelerator. The coagulation accelerator is prepared by mixing the following inorganic/organic components in parts by weight: 0.5 to 1 part of inorganic salt, 0.5 to 2 parts of organic salt, 0.04 to 0.1 part of organic amine, and 0.1 to 0.5 part of organic acid; wherein the inorganic salt is a mixture of calcium sulfate and sodium silicate; the organic salt is one or two of calcium formate, calcium oxalate, sodium acetate, and iron lactate; the organic amine can be diethanolamine, triethanolamine, or methanamide; and the organic acid is formic acid or oxalic acid. The provided coagulation accelerator has the advantages of low production cost and good early-strong effect, and also has a certain coagulation accelerating effect. The coagulation accelerator is suitable for international A-grade/G-grade oil well cement, and can be co-used with weighting materials (iron ore powder, barite powder, etc.) or lightening materials (fly ash, floating beads, etc.) to prepare cement mortar with different densities according to the needs.

Description

technical field [0001] The invention belongs to the technical field of low-temperature coagulation accelerators for cement, in particular to a low-temperature composite early-strength coagulation accelerator for oil well cement. Background technique [0002] In the exploration and development of many oil areas and the cementing operations of the surface layer of oil wells and technical casings in the past, it is found that medium and low temperature cementing is more and more common. Under low temperature conditions, the hydration rate of cement slurry is slow, and the curing time is long. During the curing process, oil, gas and water channeling are prone to occur, and the early strength of cement stone is low. The currently used water-soluble low-temperature early-strength coagulant is mainly CaCl 2 , but when the amount exceeds 4%, it will cause flash coagulation of the cement slurry, increase the initial consistency of the cement slurry, reduce the later strength of the ...

Claims

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Application Information

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IPC IPC(8): C09K8/467
CPCC09K8/467C04B40/0039
Inventor 齐奔付家文孙勤亮任秋军林志辉
Owner CNPC BOHAI DRILLING ENG
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