Temporary plugging type high-water-permeability porous cement-based material suitable for medium-low temperature geothermal wells and preparation method thereof

A technology of cement-based materials and geothermal wells, applied in chemical instruments and methods, applications, household appliances, etc., can solve problems such as easy deposition of cement blocks near the drill bit, damage to reservoir permeability, and high cement density, so as to reduce the density , Optimize rheology, reduce density

Active Publication Date: 2021-02-26
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] (2) In-depth research has not been carried out on the crushing of degraded cement in the existing technology, and the broken and powdery cement is likely to enter the reservoir and cause blockage, causing irreversible damage to the permeability of the reservoir;
[0007] (3) After the cement is completely broken and degraded, it is easy to cause secondary hydration to affect the elimination process, and the density of the cement is relatively high, and the cement blocks are easy to deposit near the drill bit, causing drill sticking accidents

Method used

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  • Temporary plugging type high-water-permeability porous cement-based material suitable for medium-low temperature geothermal wells and preparation method thereof
  • Temporary plugging type high-water-permeability porous cement-based material suitable for medium-low temperature geothermal wells and preparation method thereof
  • Temporary plugging type high-water-permeability porous cement-based material suitable for medium-low temperature geothermal wells and preparation method thereof

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preparation example Construction

[0038] The preparation method of the above-mentioned temporary plugging type highly permeable porous cement-based material suitable for medium and low temperature geothermal wells includes the following steps:

[0039] Step 1: Use a cement slurry mixer to dry and mix the raw materials at a low speed, wherein the raw materials include oil well cement, floating beads, and PVA fibers;

[0040] Step 2: Continue to open the cement paste mixer equipped with uniformly mixed raw materials, add tap water to it, and add according to the water-cement ratio W / C of 0.5. After adding, continue to keep the mixer at low speed, and turn on the stopwatch to start timing;

[0041] Step 3: After the raw materials and water are mixed at low speed, stop, and high speed by the cement slurry mixer, the slurry material of the temporary plugging type highly permeable porous cement-based material is prepared;

[0042] Step 4: After the slurry is prepared, inject the slurry into the cube triple test mol...

Embodiment 1

[0045]Temporary plugging type highly permeable porous cement-based material suitable for medium and low temperature geothermal wells, including the following raw material formula in mass percentage: oil well cement 70%, fly ash floating beads 20%, PVA fiber / particle 10%, water-cement ratio W / C is 0.5.

[0046] Based on the above-mentioned temporary plugging type highly permeable porous cement-based material, a preparation method of a temporary plugging type highly permeable porous cement-based material suitable for medium and low temperature geothermal wells is proposed, including the following steps:

[0047] Step 1: Use a cement paste mixer to dry and mix all raw materials at a low speed. The raw materials include oil well cement, floating beads, and PVA fibers. The mixing time is not less than 3 minutes to ensure that all raw materials are mixed evenly under dry conditions;

[0048] Step 2: Continue to open the cement paste mixer equipped with uniformly mixed raw materials...

Embodiment 2

[0053] Temporary plugging type highly permeable porous cement-based material suitable for medium and low temperature geothermal wells, including the following raw material formula in mass percentage: oil well cement 80%, fly ash floating beads 0-20%, PVA fiber / particle 0-10%, water The gray ratio W / C is 0.5.

[0054] The preparation method of the temporary plugging type porous cement suitable for medium and low temperature geothermal wells comprises the following steps:

[0055] Step 1: Use a cement paste mixer to dry and mix all raw materials at a low speed. The raw materials include oil well cement, floating beads, and PVA fibers. The mixing time is not less than 3 minutes to ensure that all raw materials are mixed evenly under dry conditions;

[0056] Step 2: Continue to open the cement paste mixer equipped with uniformly mixed raw materials, add ordinary tap water to it, and add according to the water-cement ratio W / C of 0.5, continue to keep the mixer at low speed, and tu...

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Abstract

The invention provides a temporary plugging type high-permeability porous cement-based material suitable for a medium-low temperature geothermal well and a preparation method thereof. The preparationmethod comprises the following steps: 1, drying and stirring raw materials at a low speed by utilizing a cement paste stirrer; 2, continuously starting the cement paste stirrer filled with the uniformly mixed raw materials, and adding tap water into the cement paste stirrer; 3, stirring the raw materials and water at a low speed, a stop speed and a high speed through a cement paste stirrer; 4, injecting the prepared slurry into a cubic triple test mold for maintenance; and 5, soaking the porous cement-based material in hot water to form the high-water-permeability porous cement-based material.The invention aims at vast medium and low temperature geothermal resources in China, wherein based on the temperature change rule in the development process, a porous material is formed after well drilling is finished while effective leaking stoppage is achieved and hole wall stability is guaranteed, the time cost of acidifying blockage removal measures or the risk of accidents caused by the factthat broken cement blocks deposit at the bottom of a well is reduced, and economic benefits are improved. Therefore, the development of geothermal energy in China is facilitated to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of temporary plugging porous cement materials suitable for medium and low temperature geothermal wells (temperature is 90-150°C), and in particular relates to a temperature-sensitive polymer-based self-degradable porous cement base suitable for medium and low temperature geothermal wells Materials and their preparation methods. Background technique [0002] Geothermal resources are divided according to temperature: high-temperature geothermal with a temperature higher than 150°C, medium-temperature geothermal with a temperature between 90 and 150°C, and low-temperature geothermal with a temperature between 25 and 90°C. my country is a large country with geothermal resources mainly at medium and low temperatures, and the national geothermal resource potential is close to 8% of the world's. The World Energy Agency's assessment report data show that, worldwide, compared with solar energy, the development of ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B38/00C09K8/508C09K8/88
CPCC04B28/00C04B2111/00284C04B2201/20C04B2201/50C09K8/5083C09K8/882C09K2208/08C04B18/082C04B16/0641C04B16/04C04B38/00C04B38/0067
Inventor 谭慧静朱海燕申岚邱德龙樊力升左悦张耿朝刘旭谢兰兰
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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