Weak coagulation type early strength agent for oil well cement

A technology of oil well cement and early-strength agent, which is applied in the field of weak coagulation-accelerating early-strength agent for oil well cement. It can solve the problems of shortening the thickening time and the early strengthening effect of cement stone is not obvious, so as to speed up the development of early strength and promote early strength. Hydration, early strength improvement effect

Active Publication Date: 2019-06-14
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims to provide a weak coagulation-accelerating early strength agent for oil well cement, which is used to solve the technical problems that conventional coagulation accelerators have no obvious early strengthening effect on cement stones and can also significantly shorten the thickening time.

Method used

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  • Weak coagulation type early strength agent for oil well cement
  • Weak coagulation type early strength agent for oil well cement
  • Weak coagulation type early strength agent for oil well cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First weigh 70 parts of nanomaterials, wherein the mixing mass ratio of nano silicon carbide and nano magnesium hydroxide is 1:1; a total of 5 parts of the mixture of naphthalene sulfonate formaldehyde condensate and lignin sulfonate, of which naphthalene sulfonate The mass ratio of formaldehyde condensate to lignosulfonate is 2:1, and the above-mentioned nanomaterials and drag reducer are mixed evenly. Then add a total of 20 parts of a mixture of potassium sulfate and sodium nitrate, and 5 parts of sodium acetate, and mix evenly to obtain a powdery weak coagulation accelerator for oil well cement, marked as 1# sample.

Embodiment 2

[0030] First take by weighing 50 parts of nanomaterials, wherein the mixing mass ratio of nanometer silicon carbide, nanometer aluminum hydroxide and nanometer magnesium hydroxide is 1:0.3:0.7; Parts, wherein the mass ratio of naphthalenesulfonate formaldehyde condensate to lignosulfonate is 2:1, and the above-mentioned nanomaterials and drag reducer are mixed evenly. Then add a total of 25 parts of a mixture of potassium sulfate and calcium sulfate, a total of 15 parts of a mixture of sodium acetate and calcium formate, and mix well to obtain a powdered oil well cement with a weak coagulation accelerator, marked as 2# sample.

Embodiment 3

[0032] First take 30 parts of nanomaterials, wherein the mixing mass ratio of nano-silicon carbide and nano-aluminum hydroxide is 1:1; a total of 15 parts of the mixture of naphthalenesulfonate formaldehyde condensate and lignosulfonate, of which naphthalenesulfonate The mass ratio of formaldehyde condensate to lignosulfonate is 2:1, and the above-mentioned nanomaterials and drag reducer are mixed evenly. Then add a total of 35 parts of a mixture of sodium nitrate and calcium sulfate, a total of 20 parts of a mixture of sodium acetate and calcium formate, and mix well to obtain a powdery weak coagulation accelerator for oil well cement, marked as 3# sample.

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Abstract

The invention discloses a weak coagulation type early strength agent for oil well cement. The early strength agent comprises the following components in parts by weight: 30-70 parts of a nano material, 20-50 parts of an inorganic salt, 5-20 parts of an organic salt and 5-30 parts of a drag reducer, wherein the nano material is selected from a mixture of a fibrous structure nano material and a flaky structure nano material. The weak coagulation type early strength agent for the oil well cement disclosed by the invention has slight influence on the thickening time of cement paste, but can obviously increase the early strength of cement stone, shows weak coagulation high early strength properties, can improve the stability of the cement paste, has no adverse effects on other performances of the cement paste, and has good comprehensive performance.

Description

technical field [0001] The invention relates to a weak coagulation-accelerating early-strength agent for oil well cement, which belongs to the field of well completion technology cementing in oil fields. Background technique [0002] With the process of petroleum exploration and development, more and more complex formations are encountered, coupled with the improvement of people's requirements for cementing quality and the reduction of operating costs, it brings severe challenges to cementing technology. The compressive strength of cement stone is an important index affecting the quality of cementing and subsequent drilling and mining. Only when the compressive strength of cement stone reaches 3.5MPa can it support the axial load formed by the casing and meet the requirements for continuous drilling; only when the strength of cement stone reaches more than 7MPa can the cement sheath have better cementation and sealing performance. If the strength of the cement is lower than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
Inventor 卢海川高继超李洋李建华刘勇霍明江宋伟宾李宗要
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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