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Biological ash low-density cement paste and preparation method thereof

A biological ash and low-density technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of reduced uniformity of cement slurry, difficulty in sealing formations, and reduced strength of cement stones, etc., achieving fast, Effect of shortening cementing waiting time and improving early strength

Active Publication Date: 2019-06-28
JINGZHOU JIAHUA TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are certain defects in low-density cement. With the addition of a large amount of lightening materials, the uniformity of cement slurry is reduced; the process of hydration reaction is affected, resulting in poor performance of the slurry, especially the sharp decrease in the strength of cement stone, which is sometimes difficult to meet The requirement for sealing the formation, and the lower the density of the cement slurry, the more prominent the contradiction

Method used

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  • Biological ash low-density cement paste and preparation method thereof
  • Biological ash low-density cement paste and preparation method thereof
  • Biological ash low-density cement paste and preparation method thereof

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preparation example Construction

[0035] The present invention also provides a method for preparing bioash low-density cement slurry described in the above technical solution, comprising the following steps:

[0036] Mix the cement, ultra-fine mineral powder, floating beads, floating beads, microsilica fume, biological ash, reinforcing agent, water, fluid loss reducing agent, dispersant, retarder and defoamer in said parts by mass to obtain Bioash low density grout.

[0037] In the present invention, the method of mixing is preferably mixing solid component cement, ultrafine mineral powder, floating beads, microsilica fume, biological ash, reinforcing agent, fluid loss reducing agent and dispersant to obtain a solid mixture, The liquid component water, retarder and defoamer are mixed to obtain a liquid mixture; the solid mixture and the liquid mixture are stirred and mixed to obtain bioash low-density cement slurry. The present invention has no special limitation on the stirring method and rate of stirring an...

Embodiment 1

[0040] Weigh each component according to the following ratio:

[0041]

[0042] Mix the solid component JHG cement, ultrafine mineral powder, floating beads, glass microspheres, microsilica fume, biological ash, and reinforcing agent to obtain a solid mixture, and mix the liquid components of water, fluid loss reducer, dispersant, retarder Mix the coagulant and defoamer to obtain a liquid mixture, mix the solid mixture and the liquid mixture and stir evenly to obtain 1.5g / cm 3 Bioash low density grout.

[0043] The basic properties of the bioash low-density cement slurry obtained in the embodiment 1 of table 1

[0044]

[0045] Wherein, the two values ​​of compressive strength in Table 1 are measured values ​​for two cement stones formed under the same formula.

[0046] As can be seen from Table 1, the low-density cement slurry density that embodiment 1 obtains is 1.5g / cm 3 , the compressive strength has a certain compressive strength within 1 day, reaching about 3MPa...

Embodiment 2

[0048] The quality of biological ash and superfine mineral powder is respectively 58g and 90g, and other is identical with embodiment 1, and the obtained 1.5g / cm 3 The properties of bioash low-density cement slurry are shown in Table 2.

[0049] The basic properties of the bioash low-density cement slurry obtained in the embodiment 2 of table 2

[0050]

[0051] It can be seen from Table 2 that the increase of bioash has little effect on the rheological data, thickening time and strength of cement slurry, and basically has no effect on the conversion time.

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Abstract

The invention provides a biological ash low-density cement paste and a preparation method thereof, and belongs to the technical field of well cementation. The biological ash low-density cement paste comprises, by mass, 250-600 parts of cement, 25-100 parts of ultrafine mineral powder, 3-20 parts of floating beads, 5-12 parts of micro silicon powder, 20-100 parts of biological ash, 10-80 parts of areinforcing agent, 250-800 parts of water, 3-60 parts of a fluid loss additive, 0-5 parts of a dispersing agent, 1-8 parts of a retarder and 0.5-8 parts of a defoaming agent. According to the preparation method, the biological ash is added into a cement paste system, the floating beads serve as a main lightening agent with the density of 0.5 g / cm<3> to reduce the density of the cement slurry, themicro-silicon powder serves as a stabilizer, and the compatibility of the biological ash and the cement is enhanced after the micro-silicon powder is mixed with the biological ash; due to the addition of the ultrafine mineral powder, the hydration capability is high, the speed is high, the hardening and condensation of the low-density cement paste can be accelerated, time for waiting on well cementation is shortened, and the early strength of the low-density set cement is effectively improved.

Description

technical field [0001] The invention relates to the technical field of well cementing, in particular to bioash low-density cement slurry and a preparation method thereof. Background technique [0002] Deepwater cementing is the prerequisite and important guarantee for the effective exploration and development of deepwater oil and gas resources. Among them, deepwater surface cementing is the initial cementing operation of deepwater oil and gas well cementing procedures. Narrow, the bottom layer is easy to leak, so low-density cement slurry is usually used (usually density range: 1.30~1.60 / cm 3 ) for deepwater surface cementing operations. [0003] At present, there are certain defects in low-density cement. With the addition of a large amount of lightening materials, the uniformity of cement slurry is reduced; the process of hydration reaction is affected, resulting in poor performance of the slurry, especially the sharp decrease in the strength of cement stone, which is som...

Claims

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Application Information

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IPC IPC(8): C09K8/473
Inventor 许明标王晓亮袁青松胡顺
Owner JINGZHOU JIAHUA TECH
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