Novel CO2-EGS mode high-temperature corrosion-resistant well cementation cement system for hot dry rock

A CO2-EGS and cementing technology, applied in the field of oil and gas well cementing, can solve the problems of high temperature strength stability, low thermal conductivity, and inability to effectively meet the performance requirements of dry hot rock high temperature cementing cement, and achieve good compressive strength Stability and admixture adaptability, good high temperature admixture adaptability, effect of improving high temperature strength stability

Active Publication Date: 2021-03-09
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the new CO 2 -Hot dry rock production wells in EGS mode require the cement sheath to have high temperature strength stability and CO2 resistance 2 Corrosivity and low thermal c

Method used

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  • Novel CO2-EGS mode high-temperature corrosion-resistant well cementation cement system for hot dry rock
  • Novel CO2-EGS mode high-temperature corrosion-resistant well cementation cement system for hot dry rock
  • Novel CO2-EGS mode high-temperature corrosion-resistant well cementation cement system for hot dry rock

Examples

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Effect test

Embodiment 1

[0031] A new type of CO 2 -The EGS model high-temperature anti-corrosion cementing cement system for dry hot rocks, involving the field of oil and gas well cementing technology, using low-calcium-silicon-ratio cement as the base cement, C 2 The S content is 50.2%, and the specific surface area is 283m 2 / Kg, 7d heat of hydration ≤ 182kJ / kg; the waste concrete is crushed and ground, and the fineness of the powder is controlled to 300 mesh, and the SiO in the powder 2 The content is 73.4%; anti-CO2 The corrosion material is mica powder, the specific composition is as follows:

[0032]

[0033] Take raw materials according to the specific composition ratio in the above table, mix them, and prepare cement slurry according to GB / T 19139, with a water-cement ratio of 0.45, to obtain a well cementing cement system.

Embodiment 2

[0035] The present embodiment adopts low-calcium-silicon ratio cement as base cement, and the specific composition is as follows:

[0036]

[0037] Take raw materials according to the specific composition ratio in the above table, mix them, and prepare cement slurry according to GB / T 19139, with a water-cement ratio of 0.45, to obtain well cementing cement slurry.

Embodiment 3

[0039] In this embodiment, cement with low heat of hydration is used as the base cement, and cement with low heat of hydration is used as the base cement. C 2 The S content is 44.5%, and the specific surface area is 325m 2 / Kg, 7d hydration heat ≤ 216kJ / kg, the specific composition is as follows:

[0040]

[0041] Take raw materials according to the specific composition ratio in the above table, mix them, and prepare cement slurry according to GB / T 19139, with a water-cement ratio of 0.45, to obtain well cementing cement slurry.

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Abstract

The invention discloses a novel CO2EGS mode high-temperature corrosion-resistant well cementation cement system for hot dry rock, which belongs to the technical field of oil and gas well cementation and is composed of the following raw materials in percentage by weight: 75-88% of cement with low hydration heat or cement with low calcium-silicon ratio, 11-20% of a high temperature strength enhancer, and 1-5% of an anti-CO2 corroding material. The high-temperature corrosion-resistant well cementation cement system for the hot dry rock has the advantages that the high-temperature corrosion-resistant well cementation cement system for the hot dry rock has corrosion resistance, high-temperature resistance and heat preservation performance at the same time, the requirements of long-term sealingand energy consumption reduction of a hot dry rock production well in a novel CO2-EGS mode can be met, and guarantee is provided for exploration and development, efficient production and environmentalprotection.

Description

technical field [0001] The invention relates to the technical field of oil and gas well cementing, in particular to a new type of CO 2 -High-temperature anti-corrosion cementing cement system for hot dry rock in EGS mode. Background technique [0002] With the rapid development of my country's economy, the problems of energy shortage and environmental pollution have become increasingly prominent, and the demand for clean energy has increased sharply. Hot dry rock is a form of geothermal energy, which refers to a dense high-temperature rock mass with no fluid or only a small amount of fluid buried deep inside. Hot dry rock contains huge heat energy, and is recognized by the international community as an efficient and clean energy source. It is extremely competitive because of its advantages such as large reserves, clean and low-carbon, safety and reliability. Rational development and utilization of geothermal energy can effectively alleviate the current over-reliance on fos...

Claims

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Application Information

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IPC IPC(8): C04B28/00C09K8/467C04B111/26
CPCC04B28/00C09K8/467C04B2111/26C04B2111/00724C04B2201/50C04B18/16C04B14/20C04B24/32
Inventor 赵峰曾雪玲种娜古安林张洋勇龙丹
Owner JIAHUA SPECIAL CEMENT
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