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Composite lightening material for well cementation, preparation method of composite lightening material, deep well composite cement paste and application of composite cement paste

A cement slurry, deep well technology, applied in wellbore/well components, chemical instruments and methods, earth-moving drilling, etc., can solve the problem of not giving the specific components of the reducing agent, the method of making the reducing agent, unsuitable for oil and gas wells, poor stability, etc. problem, to achieve the effect of simple and feasible production process, strong on-site operability and excellent performance

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But conventional fly ash can only reduce the density of cement slurry to 1.60g / cm 3 around, and poor stability
[0004] 200710120029.3 "Low Temperature and Low Density Cement Slurry" introduces the formula of a low density cement slurry, but does not give the specific composition of the lightening agent and the production method of the lightening agent
However, its modification is air separation and classification of fly ash and chemical modification of surface spraying, which is mainly used as filling material for rubber products and is not suitable for use in oil and gas wells.

Method used

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  • Composite lightening material for well cementation, preparation method of composite lightening material, deep well composite cement paste and application of composite cement paste
  • Composite lightening material for well cementation, preparation method of composite lightening material, deep well composite cement paste and application of composite cement paste
  • Composite lightening material for well cementation, preparation method of composite lightening material, deep well composite cement paste and application of composite cement paste

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Effect test

preparation example Construction

[0056] Preparation of modified fly ash:

[0057] Conventional fly ash was ball-milled in a suspension roller mill for 30 minutes, and then classified three times in a jet centrifugal superfine classifier according to the classification process to obtain different samples and test their performance, see Table 1.

[0058] Table 1 Fly ash samples and their properties

[0059]

Embodiment 1

[0061] The composite lightening material includes: 100 parts by weight of modified fly ash (sample number D4), 10 parts by weight of vermiculite (Sinopec Petroleum Engineering Technology Research Institute Oilfield Additive R&D Center) and 5 parts by weight of asbestos (Sinopec Petroleum Engineering Technology Research Institute Oilfield Additives R&D Center).

[0062] Deep well composite cement slurry: 100 parts by weight of Aksu G grade oil well cement, 1.5 parts by weight of stabilizer, 20 parts by weight of fluid loss reducer DZJ-Y, 2.0 parts by weight of early strength agent H, and 1.5 parts by weight of retarder DZH-2, adding 100 parts by weight of the composite lightening material of this embodiment, the liquid-solid weight ratio is 0.78.

[0063] Prepare cement slurry according to GB / T19139 standard (density 1.60g / cm 3 ), and carried out the settlement stability performance, thickening and compressive strength tests, the test results are shown in Table 2.

Embodiment 2

[0065] Composite lightening material: 100 parts by weight of modified fly ash (sample number D4), 12 parts by weight of vermiculite, and 6 parts by weight of asbestos.

[0066] Deep well composite cement slurry: 100 parts by weight of Aksu G grade oil well cement, 2.5 parts by weight of high temperature stabilizer, 20 parts by weight of anti-high temperature fluid loss reducing agent DZJ-Y, 2.0 parts by weight of early strength agent H, 1.5 parts by weight of Retarder DZH-2, add 120 parts by weight of the composite lightening material of this embodiment, and the liquid-solid ratio is 0.96.

[0067] Prepare cement slurry according to GB / T19139 standard (density 1.50g / cm 3 ), and carried out the settlement stability performance, thickening and compressive strength tests, the test results are shown in Table 2.

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Abstract

The invention discloses a composite lightening material which comprises the following components in parts by weight: 100 parts of coal ash, 10-15 parts of expanding materials and 5-10 parts of toughening materials, wherein the particle size range of the coal ash is 5-10 microns. The invention also relates to a preparation method of the composite lightening material, and the preparation method comprises the following steps: i) carrying out smashing and ball milling on the coal ash through an overhang roll mill, classifying the smashed and ball-milled coal ash through a classifier, and collecting the coal ash with the particle size range of 5-10 microns after the classification to obtain modified coal ash; and ii) mixing the modified coal ash obtained in the step i) with the expanding materials and the toughening materials according to the proportion so as to obtain the composite lightening material. Meanwhile, the invention also discloses deep well composite cement paste and an application of the composite cement paste in well cementing of oil / gas wells.

Description

technical field [0001] The present invention relates to the field of petroleum exploration and development, in particular to a composite lightening material for well cementing and its preparation method, deep well composite cement slurry and its application. Lighten the material. Background technique [0002] At present, during the increase and development of oilfields, due to the deep burial of some oilfield reservoirs, most of the well depths are above 6500m, the geological conditions are complex and changeable, and there are generally low-pressure and easy-to-leakage layers, which bring great difficulties and challenges to cementing operations. . The biggest difficulty in the cementing process is that leakage occurs during cementing, which leads to the return of cement slurry that does not meet the design requirements, so that the cementing quality is difficult to guarantee. Therefore, it is necessary to use a low-density cement slurry system during cementing to reduce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/473C09C1/00C09C1/40C09C1/28C09C3/04E21B33/13
CPCC04B28/02C09K8/473C04B18/08C04B14/185C04B14/40C04B2103/22C04B20/0048
Inventor 杨广国丁士东周仕明桑来玉高元常连玉汪晓静穆海朋
Owner CHINA PETROLEUM & CHEM CORP
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