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Cement paste as well as application, foamed cement system and preparation thereof

A foamed cement and cement slurry technology, applied in the field of foamed cement, can solve the problems of reducing the density of cement slurry, long thickening time, less gas generation, etc., and achieve good compression resistance and compressibility, good foaming performance and stability. Sex, the effect of maintaining integrity

Inactive Publication Date: 2019-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical gas generation method is easy to construct, but the amount of gas generation is small, especially in wells where the liquid column pressure exceeds 10.0MPa, it is difficult for this foamed cement slurry to greatly reduce the density of the cement slurry in the well
At present, various oilfields in China are mainly focusing on the chemical gas generation foam cement slurry cementing technology, but the chemical gas generation method has a small amount of gas, and the adjustable density range of the formed foam cement slurry is small (>1.45g / cm 3 ), gas-generating substances will affect the solidification time of foam cement slurry, and the cementing quality cannot be guaranteed
Due to the complex equipment and high performance requirements of cement slurry, mechanical aerated foam cement slurry cementing technology has not been studied in other oilfields except Xinjiang Huoshaoshan oilfield in China, and a complete set of mechanical equipment has not yet been formed. Inflatable foam cement well cementing technology and construction supporting technology
For aerated foam cement, the thickening time of the aerated foam cement system reported in the literature is longer, and the strength of the foam cement stone is lower; at the same time, the stability of the foam cement slurry cannot be fully guaranteed

Method used

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  • Cement paste as well as application, foamed cement system and preparation thereof
  • Cement paste as well as application, foamed cement system and preparation thereof
  • Cement paste as well as application, foamed cement system and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Weigh 100 parts of oil well G-grade Jiahua cement, 44 parts of water, 3 parts of DZJ-Y fluid loss reducer, 0.5 part of dispersant DZS, 0.1 part of xanthan gum foam stabilizer, and 1 part of calcium chloride enhancer, according to GB19139 "Oil Well Cement Test Method" formulated to a density of 1.88g / cm 3 The cement-based slurry was mixed evenly with 2.5 parts of HTW-1 protein composite foaming agent (produced by Henan Huatai New Materials Technology Co., Ltd.) to obtain cement slurry.

[0058] Pour 1.1L of cement slurry into the figure 1 In the I-shaped piston cylinder of the nitrogen injection preparation foam cement equipment shown, the stirring speed is 1000r / min. Turn on the air source, push the I-shaped piston cylinder to reciprocate, and the slurry circulates in the pipeline. At the same time, turn on the nitrogen source, adjust the nitrogen injection pressure to 2MPa, and circulate for 2-3 minutes. After the foaming is over, open the sampling barrel to take a s...

Embodiment 2

[0060] The experimental operation of Example 1 was repeated, but the difference was that the nitrogen injection pressure was adjusted to 3 MPa. The density of foam cement slurry and the test results of mechanical properties of cement stone are shown in Table 1.

Embodiment 3

[0062] The experimental operation of Example 1 was repeated, but the difference was that the nitrogen injection pressure was adjusted to 4MPa. The density of foam cement slurry and the test results of mechanical properties of cement stone are shown in Table 1.

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Abstract

The invention provides a cement paste which comprises cement, a fluid loss agent, a dispersant, a foaming agent, a foam stabilizer, an early strength agent and water, wherein the foaming agent comprises a protein type foaming agent. The invention further provides a foamed cement system based on the cement paste, and application of the cement paste. On the basis of the cement paste, filling foams which are good in stability are introduced, and foamed cement stone formed after the cement paste is cured is high in strength and good in elastoplasticity.

Description

technical field [0001] The invention relates to the technical field of foam cement, in particular to a cement slurry suitable for oil field cementing, a foam cement system based on the cement slurry, a preparation method and application thereof, and a foam cement product prepared from the cement slurry system. Background technique [0002] Foamed cement slurry has good leak-proof and anti-channeling capabilities, and strong compressibility, which is conducive to maintaining the integrity of the foamed cement sheath. Foamed cement slurry uses gas (such as air or nitrogen, etc.) as a lightening agent. By introducing gas into the cement slurry, under the action of foaming agent or foam stabilizer, foamed cement slurry is formed. According to the different ways of gas generation, the foaming of cement slurry can be divided into chemical foaming and aerated foaming. Inflatable foaming, also known as mechanical aeration method, refers to filling the ordinary cement slurry with an...

Claims

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Application Information

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IPC IPC(8): C04B38/10C09K8/467C04B28/00C04B24/14
CPCC04B24/14C04B28/00C04B38/10C04B38/103C04B2201/50C09K8/467C04B22/002C04B2103/0068C04B2103/408C04B24/38C04B22/124C04B38/0067
Inventor 曾义金肖京男周仕明丁士东桑来玉刘建
Owner CHINA PETROLEUM & CHEM CORP
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