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Preparation method of sialite binding material for well-cementing in oil-gas field

A cementing material and oil and gas field technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor cementation quality of the two interfaces, filter cake loss of water shrinkage, performance degradation, etc., to reduce CO2 and other pollution The emission of pollutants is beneficial to the effect of environmental protection and ecological balance

Inactive Publication Date: 2009-06-03
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since all research and improvements are based on the high calcium system of traditional cement, the improvements made have not escaped the shackles of the theory of hydration and hardening of the high calcium system of traditional oil well cement, resulting in a new type of cement slurry system or because of the high cost. But it is difficult to popularize, or the improvement of some performances leads to the deterioration of other performances
In particular, the problems of filter cake dehydration shrinkage and poor cementation quality of the two interfaces due to incomplete filter cake replacement, high-temperature underground fluid erosion, and anti-penetration problems have not been well resolved.
Although many cementing workers have made many improvements on the basis of ordinary cementing cement according to the actual situation of the formation and the actual cementing, all the improvements are based on the high calcium system of cement, so the above cementing project The existing problems have always plagued my country's oil industry

Method used

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  • Preparation method of sialite binding material for well-cementing in oil-gas field
  • Preparation method of sialite binding material for well-cementing in oil-gas field
  • Preparation method of sialite binding material for well-cementing in oil-gas field

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Embodiment 1

[0023] In the present embodiment, the preparation method of gelatin cementitious material for well cementing consists of the following steps:

[0024] (1) Prepare the mixed material, mix 30% of cement clinker, 68% of steel slag and 2% of fly ash according to the weight percentage, and use a Φ500*500mm ball mill to grind it until the specific surface area is 400m 2 / Kg.

[0025] (2) the specific surface area gained in step (1) is 400m 2 The mixture of 35% / Kg, 55% fly ash and 10% diagenetic agent is mixed with a Φ500*500mm ball mill until the specific surface area is 1500m 2 / Kg.

[0026] (3) Grinding 15% expanded vermiculite flakes to a specific surface area of ​​1500m 2 / Kg, then mixed with the mixed material 85% obtained in the above-mentioned step (2) by weight percentage, after the various powders obtained were homogenized and checked, the gelatin cementitious material for well cementing was obtained. The properties of the cementing fluid and its hardened body prepared ...

Embodiment 2

[0030]In the present embodiment, the preparation method of gelatin cementitious material for well cementing consists of the following steps:

[0031] (1) Prepare the mixed material, mix 35% of cement clinker, 60% of granulated blast furnace slag, and 5% of fly ash according to the weight percentage, and use a Φ500*500mm ball mill to mix and grind until the specific surface area is 560m 2 / Kg.

[0032] (2) 35% of the above-mentioned ground mixed material, 57% of coal-fired slag, and 8% of diagenetic agent are mixed according to weight percentage, and then mixed with Φ500 * 500mm ball mill mixed grinding until the specific surface area is 950m 2 / Kg.

[0033] (3) Grind 10% expanded vermiculite flakes to a specific surface area of ​​950m 2 / Kg, and then mixed with 90% of the mixed material obtained in the above-mentioned step (2) by weight percentage, after homogenization and inspection of various powders obtained, the gelatin cementitious material for well cementing is obtain...

Embodiment 3

[0037] In the present embodiment, the preparation method of gelatin cementitious material for well cementing consists of the following steps:

[0038] (1) Prepare the mixed material, mix 44% of cement clinker, 55% of granulated blast furnace slag, and 1% of fly ash according to the weight percentage, and mix and grind it with a ball mill until the specific surface area is 460m 2 / Kg.

[0039] (2) 55% of the above-mentioned finely ground mixed material, 42% of burnt clay, and 3% of diagenetic agent are mixed according to weight percentage, and mixed with a ball mill until the specific surface area is 1050m 2 / Kg.

[0040] (3) Grinding 5% expanded vermiculite flakes to a specific surface area of ​​1050m 2 / Kg, then mix with the mixed material 95% of the above-mentioned step (2) gained by weight percentage, after the various powders of gained are homogenized and checked, just obtain the gelatin cementitious material for well cementing. The properties of the cementing fluid and...

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Abstract

The invention discloses a preparation method of a sialite binding material for well-cementing in an oil-gas field, which belongs to the field of oil and gas development. The preparation method comprises the steps of mixing (by weight percentage) cement clinker 0-45%, granular blast-furnace cinder 55-95% and pulverized fuel ash 0-5%, and grinding together; mixing (by weight percentage) the ground mixed material 30-59.5%, pulverized fuel ash, coal-fired furnace cinder burnt clay or red mud 40-60% and a diagenetic agent, and grinding together; and mixing (by weight percentage) the ground mixed material 80-95% and ground expanded vermiculite 5-15% to obtain the sialite binding material for well-cementing. The preparation method is not only in favor of solving various problems in well-cementing in the oil-gas field, but also remarkably reduces emission of CO2 and other pollutants compared with that in the conventional oil-well cement production.

Description

technical field [0001] The invention relates to a method for preparing gelatin cementitious material for well cementing in oil and gas fields, belonging to the field of petroleum and natural gas development. technical background [0002] The cementitious material currently used for cementing in the process of oil and gas development at home and abroad is mainly oil well cement. [0003] The high calcium system and inherent hydration characteristics (C-S-H gel) of traditional oil well cement, the use environment (high temperature, high pressure) and construction technology (high water-cement ratio, high fluidity) determine some of its fatal flaws. When cementing with traditional oil well cement, in order to control fluidity and thickening time, the water-cement ratio must be controlled at a relatively high level. The C-S-H gel formed during solidification not only contains a large amount of crystal water and quasi-crystal water, but also Also contains a lot of free water whi...

Claims

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Application Information

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IPC IPC(8): C09K8/46
Inventor 孙恒虎倪文魏秀泉郑永超徐维瑞李宇
Owner TSINGHUA UNIV