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Low-density high-strength leak-resistant slurry method for sealing leakage producing formation

A leak-proof, high-strength technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of large reduction in compressive strength of cement stone, limited application range, difficult performance adjustment, etc., to improve mechanical properties, Large social benefits, the effect of reducing corrosion

Active Publication Date: 2010-10-27
CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG
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Problems solved by technology

At present, some properties of the system are difficult to adjust due to the influence of the by-products of the reaction of the chemical blowing agent on other admixtures
When mixed with water loss reducing agent, the compressive strength of cement stone will be greatly reduced, so the scope of application is limited

Method used

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  • Low-density high-strength leak-resistant slurry method for sealing leakage producing formation
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  • Low-density high-strength leak-resistant slurry method for sealing leakage producing formation

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with embodiment:

[0029] The low-density, high-strength anti-leakage cement slurry method used to seal the lost production layer, according to the principle of particle gradation, mixes cement, micro-silicon, floating beads, fluid loss reducer, expansion agent, drag reducer and water in a certain proportion.

[0030] Table 1 shows the thickening time performance data table of low-density high-strength anti-leakage cement. From the data of the following examples, it can be seen that the determined cement slurry formula has good compatibility with changes in the cement production area and the amount of lightening agent. The thickening time of the cement slurry is more than 110 minutes, which can meet the requirements of the performance parameters of the cementing site construction.

[0031] Table 1

[0032]

Grout

formula

water solid ratio

temperature ...

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Abstract

The invention belongs to the technical field of oilfield cementing, in particular to a low-density high-strength leak-resistant slurry method for sealing leakage producing formation in a well drilling area. The method is characterized in that: cement, micro silicon, hollow micro spheres, a fluid loss agent, an expanding agent, and water are mixed in a certain ratio according to the grain composition principle, and the mixture is mixed with the water in a certain ratio, wherein the ratio of water to solid is 0.67 to 0.46, the cement slurry density is between 1.25 and 1.45g / cm<3>, and the cement slurry thickening time is between 110 and 240 minutes. The invention provides a low-density high-strength leak-resistant slurry method for sealing the leakage producing formation, which realizes balanced pressure well cementation and solves the problems of serious leaker cementing quality and cement top in a bed of interest.

Description

technical field [0001] The invention belongs to the technical field of oil field cementing, in particular to a low-density, high-strength anti-leakage cement slurry method for sealing lost production layers in a drilling area. Background technique [0002] The oilfield drilling area is characterized by low pressure, low permeability, low pressure and high permeability, fracture development, and complex pressure system, and its development is becoming more and more difficult. At the same time, a pressure deficit is formed due to unbalanced production and injection or energy loss driven by formation pressure, forming a low pressure Easy to leak oil layer. In order to meet the cementing requirements, it is key to choose a reasonable cementing pressure difference, a suitable cementing slurry density and a reasonable construction process. The cement slurry with conventional density is used to seal the oil and gas layers. The pressure of the cement slurry column is high, and the ...

Claims

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Application Information

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IPC IPC(8): C09K8/467C09K8/487C09K8/473
Inventor 常占宪贾芝王大权李宏峰邢鹏举王瑞玲
Owner CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG
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