Follow-drilling plugging agent and its preparation method and use

A technology of plugging and drilling while drilling, applied in the directions of reagents, earth-moving drilling and production, products, etc., can solve the problems of increasing downhole accidents and mud costs, affecting the rheology of drilling fluid, reducing drilling speed, etc., achieving good compatibility, blocking Significant leakage effect and stable borehole wall effect

Active Publication Date: 2005-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lost circulation agent provided by this patent also has the following problems: it is very easy to generate foam when used in drilling fluid; it affects the rheology of drilling fluid; only specific drilling fluid systems can be used; the formed plugging layer is relatively loose; Need to stop drilling
There are problems such as short and thin fibers, light density, h

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Mixed liquid of well fluid and plugging agent while drilling, wherein the weight ratio of plugging agent while drilling to the volume of well mud is 3×10 -2 tons / cubic meter.

[0047] Preparation method of plugging agent while drilling: take rice straw (select non-rotten dry straw, commercially available), soak it in 95°C, concentration of 15%wt alkali solution, soak time is 2 hours, after alkali treatment The stalks are washed until the pH value is 7, dried, and crushed to a particle size of 50-40 mesh. Limestone powder (produced by Henan Gongyi Fengye Petroleum Auxiliary Factory, industrial product, calcium carbonate content accounts for 92%wt of the total amount of limestone) is pulverized through a 200-mesh sieve, and the sieve balance accounts for 3%wt of the total amount of limestone; the oil-soluble resin is light-colored Coumarone resin (industrial product, commercially available) has an oil-soluble rate of 98%wt in anhydrous kerosene, and a softening point of ...

Embodiment 2

[0050] In the mixed fluid of removing the well fluid and the lost circulation agent while drilling, the ratio of the weight of the lost circulation agent while drilling to the volume of the well mud is 4×10 -2 All the other conditions are the same as in Example 1 except tons / cubic meter.

Embodiment 3

[0052] In the mixed fluid of removing the well fluid and the plugging agent while drilling, the ratio of the weight of the plugging agent while drilling to the volume of the well mud is 1×10 -2 All the other conditions are the same as in Example 1 except tons / cubic meter.

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Abstract

The invention provides a leak preventer along with drilling and the method for its preparation, relating to the field of additive of boring fluid. Such leak preventer along with drilling contains: a) plant fiber without colloid or lignin, 100 weight shares; b) lime carbonate with calcium carbonate for at least 90 weight percent, 10-60 weight shares; c) oil-soluble resin of oil-soluble ratio no less than 95 weight percent and softening point 50-250 Deg. C, 3-30 weight shares. The leak preventer along with drilling is prepared by equably mixing the disintegrated ingredients which contains there substances above. It has a remarkable effect of leak prevention, which can be mixed with boring fluid to prevent leak while drilling, needing not stop drilling or stop laboratory sifter, improving the drilling speed and saving the drilling cost. And it also can release stoppage in acid solvent, oil solvent and negative pressure, and protect the reservoir. The leak preventer along with drilling is easy to spread, extensive sources of the material, low cost, and convenient technique.

Description

technical field [0001] The invention relates to a drilling fluid treatment agent used in petroleum drilling engineering, and furthermore, relates to a plugging agent while drilling, its preparation method and its application in drilling fluid. Background technique [0002] At present, the technology adopted for the treatment of lost circulation at home and abroad is generally "equal emphasis on prevention and blockage". "Prevention" refers to preventive measures, mainly including predicting formation pressure gradient, balancing pressure drilling, using high-quality mud (well mud), aerated drilling fluid, etc. "Blocking" refers to plugging. In terms of plugging, there are no less than 40 kinds of plugging technologies at home and abroad, especially there are many plugging slurry formulas, and there are more than 500 kinds in the United States. Comparing the general technologies for the treatment of lost circulation in the United States, Romania, the Soviet Union and my coun...

Claims

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Application Information

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CPCY02P20/141
Inventor 李家芬李贵恩苏长明刘修善于培志
Owner CHINA PETROLEUM & CHEM CORP
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