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Thermal insulation cement slurry for well cementation of low-temperature sections of deep geothermal wells and preparation method thereof

A geothermal well and low-temperature section technology, applied in the field of oil well cement, can solve problems such as poor thermal insulation performance, and achieve the effects of outstanding thermal insulation capacity, low water loss, and shortened cementing operation time

Inactive Publication Date: 2017-09-29
西安浩沃市政工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problem of poor thermal insulation performance of the existing oil well cement, the present invention provides a cementing thermal insulation cement slurry in the low temperature section of a deep geothermal well and a preparation method thereof. The thermal insulation cement slurry in the low temperature section of a deep geothermal well has good thermal insulation performance capacity, and has the advantages of low density, early strength, low water loss, easy pumping, etc.

Method used

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  • Thermal insulation cement slurry for well cementation of low-temperature sections of deep geothermal wells and preparation method thereof
  • Thermal insulation cement slurry for well cementation of low-temperature sections of deep geothermal wells and preparation method thereof
  • Thermal insulation cement slurry for well cementation of low-temperature sections of deep geothermal wells and preparation method thereof

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Effect test

Embodiment 1

[0025] The deep geothermal well low temperature section cementing insulation cement slurry of this embodiment is prepared from the following raw materials in weight percentage: oil well cement 20.7%, oil well ultrafine cement 20.3%, tungsten diselenide 5%, nano silicon dioxide 3.1% , hollow glass microspheres 6.7%, early strength agent 1.4%, fluid loss reducer 1.2%, dispersant 0.3%, glass wool fiber 1.5%, active calcium silicate 4.3%, sodium silicate 3%, water 32.5%.

[0026] The preparation method of the cementing and thermal insulation cement slurry in the low-temperature section of the deep geothermal well comprises the following steps:

[0027] Step 1: Add 20.7% oil well cement, 20.3% oil well superfine cement, 5% tungsten diselenide, 3.1% nano silicon dioxide, 6.7% hollow glass microspheres, 1.4% early strength agent, 1.2% fluid loss reducer, 0.3% dispersant and 32.5% water, stirred until uniformly mixed to obtain a mixture;

[0028] Step 2: Add 1.5% glass wool fiber, 4....

Embodiment 2

[0030] The deep geothermal well low temperature section cementing insulation cement slurry of this embodiment is prepared from the following raw materials in weight percentage: oil well cement 18%, oil well ultrafine cement 23%, tungsten diselenide 5%, nano silicon dioxide 3% , hollow glass microspheres 5%, early strength agent 3%, fluid loss reducer 1.6%, dispersant 0.5%, glass wool fiber 1.5%, active calcium silicate 5%, sodium silicate 2%, water 32.4%.

[0031] The preparation method of the cementing and thermal insulation cement slurry in the low-temperature section of the deep geothermal well comprises the following steps:

[0032] Step 1: Add 18% oil well cement, 23% oil well superfine cement, 5% tungsten diselenide, 3% nano silicon dioxide, 5% hollow glass microspheres, 3% early strength agent, 1.6% fluid loss reducer, 0.5% dispersant and 32.4% water, stirred until uniformly mixed to obtain a mixture;

[0033] Step 2: Add 1.5% glass wool fiber, 5% active calcium silica...

Embodiment 3

[0035] The deep geothermal well low temperature section cementing insulation cement slurry of this embodiment is prepared from the following raw materials in weight percentage: oil well cement 15%, oil well ultrafine cement 25%, tungsten diselenide 4%, nano silicon dioxide 5% , hollow glass microspheres 4%, early strength agent 4%, fluid loss reducer 1%, dispersant 0.6%, glass wool fiber 1%, active calcium silicate 6%, sodium silicate 4%, water 30.4%.

[0036] The preparation method of the cementing and thermal insulation cement slurry in the low-temperature section of the deep geothermal well comprises the following steps:

[0037] Step 1: Add 15% oil well cement, 25% oil well superfine cement, 4% tungsten diselenide, 5% nano silicon dioxide, 4% hollow glass microspheres, 4% early strength Agent, 1% fluid loss reducer, 0.6% dispersant and 30.4% water, stirred until uniformly mixed to obtain a mixture;

[0038] Step 2: Add 1% glass wool fiber, 6% active calcium silicate and 4...

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Abstract

The invention specifically relates to a thermal insulation cement slurry for the well cementation of low-temperature sections of deep geothermal wells and a preparation method thereof. The thermal insulation cement slurry for the well cementation of low-temperature sections of deep geothermal wells is prepared from the following materials in percentage by weight: 15 to 25 percent of oil well cement, 15 to 25 percent of ultrafine oil well cement, 4 to 7 percent of tungsten diselenide, 2 to 5 percent of nano-silica, 4 to 7 percent of hollow glass microspheres, 1 to 4 percent of early strength agent, 1 to 2 percent of fluid loss reducer, 0.2 to 0.6 percent of dispersant, 1 to 3 percent of glass wool fibers, 5 to 10 percent of silicate and the balance of water. The preparation method includes the following steps: the oil well cement, the ultrafine oil well cement, the tungsten diselenide, the nano-silica, the hollow glass microspheres, the early strength agent, the fluid loss reducer, the dispersant and the water are stirred to be uniformly mixed, the glass wool fibers and the silicate are then sequentially added, and stirring is carried out for uniform mixing. The thermal insulation cement slurry for the well cementation of low-temperature sections of deep geothermal wells disclosed by the invention has good thermal insulation capability and the advantages of low density, early strength, low moisture loss, easiness in pumping and the like, and the various property indexes can fully meet the requirement of on-site well cementation.

Description

technical field [0001] The invention belongs to the technical field of oil well cement, and in particular relates to a cement slurry for cementing and heat preservation in the low-temperature section of a deep geothermal well and a preparation method thereof. Background technique [0002] Cementing is the process of injecting cement slurry into the annular space between the well wall and the casing. Its purpose is to isolate layers and support and protect the casing. The quality of cementing is directly related to the life and resources of oil and gas wells. protection of. Therefore, all aspects of cementing operations must be fully considered, such as: wellbore preparation, cementing materials, cementing tools and accessories, cementing technology, cementing equipment and cementing construction. As the main carrier for interlayer isolation and casing protection, cementing material has always been the most important part of cementing design and the main aspect of cementing ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C09K8/467
CPCC04B28/00C04B2201/32C04B2201/50C09K8/467C04B14/36C04B14/062C04B14/24C04B2103/12C04B2103/0068C04B2103/408C04B14/42C04B14/043C04B12/04C04B22/002
Inventor 徐冰钦罗智星
Owner 西安浩沃市政工程有限公司
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