High temperature resistant declining admixture for oil well cement and preparation method thereof

A technology for oil well cement and high temperature resistance, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as strength recession, and achieve the effects of reducing recession, reducing compressive strength and wide application range

Active Publication Date: 2018-04-13
成都博世威科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in the prior art, even if silica fume with a cement ratio of 35% or more is added under the high temperature condition of 150°C or above, there will be a relatively large strength decline. The purpose is to provide an oil well Cement anti-high temperature decay external admixture, through the optimization of the formula, can effectively ensure the compressive strength above 200 ℃, and achieve the effect of reducing the decline of compressive strength

Method used

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  • High temperature resistant declining admixture for oil well cement and preparation method thereof
  • High temperature resistant declining admixture for oil well cement and preparation method thereof
  • High temperature resistant declining admixture for oil well cement and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] An oil well cement anti-high temperature decay external admixture, including photovoltaic silicon, fumed silica, dead-burned magnesia and mineral fiber.

[0025] The BHS-70S of the present invention is used as a part of dry ash to prepare a geothermal well cementing slurry system, and the performance of the geothermal well cementing slurry system is tested. The specific composition of the geothermal well cementing slurry system is set as follows:

[0026] The geothermal well cementing cement slurry system includes dry ash, fluid loss reducer BFL-12L, drag reducer BFR-31L and high temperature retarder BRT-22L; among them, BHS-70S of the present invention, micro silicon, high temperature stabilizer BCS -400S and G grade oil well cement together constitute dry ash.

[0027] The high temperature retarder BRT-22L includes AMPS (2-acrylamido-2-methylpropanesulfonic acid), acrylamide, itaconic acid, maleic anhydride, acryloylmorpholine and water.

[0028] High temperature sta...

Embodiment 2

[0038] The difference between this embodiment and Embodiment 1 is that the ratio of each material of an oil well cement anti-high temperature recession external admixture in this embodiment is different, and the specific ratio in this embodiment is as follows:

[0039] An oil well cement anti-high temperature decay external admixture is composed of 57% photovoltaic silicon, 15% fumed silicon dioxide, 27% dead-burned magnesia, and 1% mineral fiber.

Embodiment 3

[0041] The difference between this embodiment and Embodiment 1 is that the ratio of each material of an oil well cement anti-high temperature recession external admixture in this embodiment is different, and the specific ratio in this embodiment is as follows:

[0042] An oil well cement anti-high temperature decay external admixture is composed of 57% of photovoltaic silicon, 27% of fumed silicon dioxide, 15% of dead-burned magnesia, and 1% of mineral fiber.

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Abstract

The invention discloses a high temperature resistant declining admixture for oil well cement and a preparation method thereof, and solves the problem that a cement paste system is not suitable for well cementation of geothermal wells with superhigh temperature and superhigh temperature difference in the prior art. The high temperature resistant declining admixture comprises 40% to 60% of photovoltaic silicon, 15% to 30% of fumed silica, 15% to 30% of dead burned magnesia and 1% to 2% of mineral fiber. According to the high temperature resistant declining admixture, the compressive strength of200 DEG C or more can be effectively guaranteed, and the effect of reducing the declining of the compressive strength is reached.

Description

technical field [0001] The invention relates to the field of cement external admixtures, in particular to an oil well cement anti-high temperature recession external admixture and a preparation method thereof. Background technique [0002] my country is relatively rich in geothermal resources. The total amount of geothermal resources accounts for about 7.9% of the world's total, and the recoverable reserves are equivalent to 462.65 billion tons of standard coal. steam), geothermal resources can not only provide clean energy, but also a hot brine resource and natural fertilizer water resource for extracting industrial raw materials such as bromine, iodine, borax, potassium salt, and ammonium salt. In today's environment with huge environmental pressure and the promotion of new energy development, geothermal resources will be fully utilized. [0003] The cementing of geothermal wells is similar to the cementing of ultra-high temperature oil and gas wells. During the injection ...

Claims

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Application Information

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IPC IPC(8): C04B14/38C09K8/467
CPCC04B40/0039C09K8/467C04B14/04C04B14/064C04B14/304C04B14/38
Inventor 罗杨李仕勇
Owner 成都博世威科技有限公司
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