A high-temperature cementing cement system for hot dry rock water injection wells

A technology for cementing cement and water injection wells, which is applied in the field of cement slurry system, can solve the problems such as failure to achieve high temperature strength stability, high toughness and high thermal conductivity, achieve high compressive strength stability, improve recession, and improve high temperature The effect of strength stability

Active Publication Date: 2022-05-13
JIAHUA SPECIAL CEMENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a high-temperature cementing cement system for hot dry rock water injection wells, which has the characteristics of high-temperature strength stability, high toughness and high thermal conductivity, and solves the problem that the cementing cement in the prior art cannot achieve high-temperature strength Criteria for stability, high toughness and high thermal conductivity, making it unsuitable for hot dry rock construction requirements

Method used

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  • A high-temperature cementing cement system for hot dry rock water injection wells
  • A high-temperature cementing cement system for hot dry rock water injection wells
  • A high-temperature cementing cement system for hot dry rock water injection wells

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Embodiment 1

[0036] A high-temperature cementing cement system for hot dry rock water injection wells, belonging to the technical field of cement slurry systems, adopts 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 tin content is 73.4%; the carbon fiber diameter is 6µm, and the tensile strength is 3000MPa; the tin content in metal tin powder is 99.95%, and the fineness is 325 mesh.

[0037] The specific composition is as follows:

[0038]

[0039] 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. Samples were taken and cured at 240°C. The results are shown in Figure 1.

Embodiment 2

[0041] Select the materials in Example 1, add materials according to the ratio in the table below, and ensure the water-cement ratio is 0.45 to obtain well cementing cement slurry.

[0042]

Embodiment 3

[0044] In this embodiment, low hydration heat cement is adopted as base cement, C 2 The S content is 44.5%, and the specific surface area is 325m 2 / Kg, 7d hydration heat ≤ 216kJ / kg, water-cement ratio 0.45, the specific composition is as follows:

[0045]

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Abstract

The invention discloses a high-temperature cementing cement system for hot dry rock water injection wells, which belongs to the technical field of cement slurry systems, and includes: cement with low heat of hydration or cement with low calcium-silicon ratio: 75-88%; high-temperature strength enhancer: 11-88% 24%; high-temperature toughening agent: 0.1-0.5%; thermally conductive admixture: 0.5-2%. In the present invention, by utilizing low-heat-of-hydration cement and low-calcium-silicon-ratio cement, after adding high-temperature external admixture and high thermally conductive material, effective The high-temperature strength stability, toughness and thermal conductivity of the cement are improved, and at the same time, it has good working performance and can meet the performance requirements of the cementing engineering of the hot dry rock water injection well.

Description

technical field [0001] The invention relates to the technical field of cement slurry systems, in particular to a high-temperature cementing cement system for hot dry rock water injection wells. 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. Geothermal resources, as a clean, environmentally friendly and huge reserves of natural resources, are considered by human beings as an important exploitable resource. Hot dry rock is one of the geothermal resources. It is a hot rock mass without water or steam. It is buried at a depth of 2-6km from the surface and has a temperature of about 150-650°C. At present, hot dry rock is mainly used for power generation. Water is injected into the underground hot dry rock formation through deep wells to penetrate into the cracks in the rock formation and absorb g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/16C04B14/38C04B14/34
CPCC04B28/00C04B18/16C04B14/386C04B14/34C04B2111/00724C04B2201/50C04B2201/32Y02W30/91
Inventor 古安林曾雪玲张洋勇赵峰刘欢张凌志
Owner JIAHUA SPECIAL CEMENT
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