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A cementing slurry leakage prevention and lightening material and preparation method thereof

A cementing cement slurry and leakage prevention technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high cement density, fracturing and leakage leakage, etc., achieve low cost, reduce prevention and control Leakage, the effect of simple equipment conditions

Active Publication Date: 2016-06-29
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the phenomenon of excessive cement density in the formation cementing construction in the prior art, which leads to a large amount of fracturing and seepage loss in the lower part; to provide a method that can reduce the density of cement slurry, and can be used in low-pressure and easy-to-leakage formations. Cementing cement slurry lightening anti-leakage material capable of reducing liquid column pressure and blocking leakage channels during cementing construction and preparation method thereof

Method used

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  • A cementing slurry leakage prevention and lightening material and preparation method thereof
  • A cementing slurry leakage prevention and lightening material and preparation method thereof
  • A cementing slurry leakage prevention and lightening material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 is described in conjunction with actual experimental data.

[0019] A cementing slurry leak-proof mitigation material selected, the main components are closed expanded perlite 35%-40%, micro-silica fume 20%-25%, fly ash 30%-35%, sodium sulfate 5%-10% %, the above percentages are by weight.

[0020] The particle size of the closed expanded perlite ranges from 180 μm to 830 μm.

[0021] The closed expanded perlite has a particle size of 350 μm.

[0022] The closed expanded perlite is a closed expanded perlite with an expansion factor of 7-10 times.

[0023] The particle size range of the particulate silicon powder is 0.1-120 μm.

[0024] The particle diameter of the particulate silicon powder is 12 μm.

[0025] Combined with relevant experimental data feedback and experimental data tables 1-3 below, further describe the excellent technical effects of the above materials in actual construction, including but not limited to the appearance and physical prope...

Embodiment 2

[0039] Embodiment 2: on the basis of the scheme of embodiment 1, preferably by the raw material composition of following percentage by weight: closed expanded perlite 38%, microsilica fume 22%, fly ash 32%, sodium sulfate 8%. Use this percentage to save material and get the best dilution and saturation ratios.

[0040] This test measures the density of the specific lightening material in this embodiment, and the density of the cement slurry formed by adding different proportions to cement; after standing for 2 hours, test the free water of the slurry and observe the stability of the lightening material in Example 2.

[0041] Test (1): Physical properties of lightening material samples of Example 1

[0042] At room temperature of 25°C, observe the appearance of the production samples and measure their physical properties. The results are shown in Table 4.

[0043] Table 4 Lightening material appearance and physical properties

[0044]

[0045] Referring to Table 1, it can ...

Embodiment 3

[0056] On the basis of embodiment 1 or 3 material selection, make anti-leakage lightening material according to the following method steps:

[0057] (1) Add the closed-end expanded perlite with the formula amount in the particle size range of 180μm-830μm into the closed mixing tank;

[0058] (2) While stirring, add the formula amount of particle size range of 0.1-120μm micro-silica powder, stir well and then add the formula amount of fly ash and sodium sulfate in sequence;

[0059] (3) Stir for 10-15 minutes after all the addition is completed, so that it is fully mixed and evenly mixed to prepare the cementing slurry leakage prevention and lightening material.

[0060] As mentioned above, the use of 180μm-350μm closed-end expanded perlite can control the volume change of the formed cement slurry during the expansion and compression process <6%, which will not affect the normal cementing.

[0061] The following combines the relevant experimental data feedback and experimental d...

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Abstract

The invention relates to a well cementation slurry leakproof light-weight material and a preparation method thereof. The well cementation slurry leakproof light-weight material mainly comprises the following components in percentage by weight: 35-40% of closed expanded perlite, 20-25% of particle silicon powder, 30-35% of coal ash and 5-10% of sodium sulfate. The preparation method comprises the following steps: (1) adding the closed expanded perlite into a closed mixing tank, and continuously stirring; (2) adding the particle silicon powder while stirring, and sequentially adding the coal ash and sodium sulfate; and (3) uniformly stirring after the components are totally added, and preparing the leakproof light-weight material. After the materials in a specific ratio and the material obtained by the preparation method are mixed with cement through a dry method, the formed cement slurry is high in stability, the density of the cement slurry can be reduced to 1.20g / cm<3> to the greatest degree, the adopted raw materials are low in cost, the preparation method and the needed equipment conditions are simple and easy to implement, the requirement of a low-pressure leakage well on the well cementation slurry is met, the cost is greatly reduced, and the well cementation slurry leakproof light-weight material and the preparation method thereof can be widely applied to cementing operations of exploratory wells and deep wells in the oil and gas field.

Description

technical field [0001] The invention relates to a cementing slurry material and a preparation method thereof, in particular to a cementing slurry leakage prevention and mitigation material and a preparation method thereof. Background technique [0002] Although a lot of research has been done on cementing lightening materials at home and abroad, various solid, liquid, and gas lightening agents have been developed, and a lot of application results have been achieved in cementing operations in different oil and gas fields. However, each lightening material has certain limitations. The currently used low-density cement slurry system can be divided into three categories according to the lightening principle of the lightening material: Such ultra-fine powder is the lightening material. This kind of lightening material is generally water-absorbing or thickening material. The reduction of the density of the cement slurry mainly depends on the large water-cement ratio. The use densi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/473
CPCC04B22/14C04B28/00C09K8/473C04B18/08C04B14/185C04B14/06
Inventor 陈兴中周兵李海龙刘志雄刘小坤曹彦琴姜向祖朱哲万向臣
Owner BC P INC CHINA NAT PETROLEUM CORP