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A kind of preparation method of pressure-bearing plugging agent for drilling fluid

A plugging agent and drilling fluid technology, which is applied in the field of oil drilling, can solve the problems of not being able to achieve stable well walls and high costs, and achieve remarkable plugging effects, strong high-pressure capabilities, and good plugging effects

Active Publication Date: 2018-09-25
SICHUAN ZHENGRONG IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the problem that the lost circulation agent treatment agent in the prior art can not achieve good stability of the well wall, prevent leakage, improve the effect of the pressure bearing capacity of the well wall and the high cost, and proposes a new plugging agent for drilling fluid. The preparation method of leakage agent, the mixed use of walnut shell powder, rice straw pyrolysis fiber, modified asphalt and various additives in a specific proportion can effectively fill micro-cracks under pressure, prevent leakage and collapse, and improve the pressure bearing of well wall Capacity and Stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of a pressure-bearing plugging agent for drilling fluid comprises the following steps:

[0020] (1) First extract the cracked fiber of rice straw: separate the leaves, stems and ears of the rice straw raw material, discard the leaves and ears, cut the stem into 3-5cm, soak in 5% sodium bicarbonate solution for 24 hours, take out , keep the moisture content 10-15%, and then expand the rod through the expansion equipment to obtain the straw cracked fiber in the form of cotton ball;

[0021] (2) Preparation of modified asphalt:

[0022] First mix 360kg of water with 22kg of dodecyl dimethyl benzyl ammonium chloride, then thoroughly mix them through an emulsifier to form a soap solution and heat it to 65°C; then grind and mix the soap solution with 580kg of 90# asphalt through a colloid mill To obtain emulsified asphalt, then quickly mix the emulsified asphalt with 38kg of liquid fluorosilicone rubber heated to 40°C in a mixer, and stir thoroughly to o...

Embodiment 2

[0026] The preparation of rice straw pyrolysis fiber and modified asphalt is as in Example 1.

[0027] Preparation of pressure-bearing plugging agent for drilling fluid

[0028] According to the proportion by weight, take 40 parts of walnut shell powder, 30 parts of rice straw cracked fiber, 4 parts of calcium carbonate powder, 1 part of hydrolyzed polyacrylonitrile ammonium salt, 4 parts of instant sodium silicate, 6 parts of aluminum stearate, carboxylate 5 parts of methyl cellulose, 5 parts of redispersible latex powder, 10 parts of modified asphalt, mixed in a mixing device for 1 hour, dried at a constant temperature of 60°C, and granulated. The average particle size is 20-300 mesh. The pressure-bearing plugging agent for drilling fluid is obtained.

[0029] Example 2

[0030] The preparation of rice straw pyrolysis fiber and modified asphalt is as in Example 1.

[0031] Preparation of pressure-bearing plugging agent for drilling fluid

[0032] According to the ratio b...

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PUM

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Abstract

The invention discloses a method for preparing a pressure-bearing blocking agent for drilling fluid. The pressure-bearing blocking agent is prepared from the following components in parts by weight: 40-50 parts of walnut shell powder, 30-40 parts of straw cracking fiber, 4-8 parts of calcium carbonate powder, 1-3 parts of ammonium salt of partially hydrolyzed polyacrylonitrile, 10-20 parts of a penetration-resistant agent, 5-10 parts of carboxymethyl cellulose, 5-10 parts of redispersible latex powder and 10-20 parts of modified asphalt. The method comprises the following steps: putting the components into stirring equipment, mixing for 1-2 hours, and drying and pelleting at constant temperature of 60 DEG C till the average particle size is 20-300 meshes, so as to obtain the pressure-bearing blocking agent for the drilling fluid. The pressure-bearing blocking agent prepared by using the method has the advantages of being good in blocking effect and high in pressure bearing strength, and materials are cheap and easy to obtain.

Description

technical field [0001] The invention relates to an auxiliary agent for petroleum drilling, in particular to a preparation method of a pressure-bearing plugging agent for drilling fluid, and belongs to the technical field of petroleum drilling. Background technique [0002] In the process of petroleum exploration and development, lost circulation is the most common complex phenomenon, especially in micro-fractured formations, permeable formations, shale formations, coal seams, fractured zone formations and reservoirs, where wellbore instability and lost circulation risks are high. increase; wellbore instability usually causes the wellbore to collapse, causing the risk of drill sticking and burial of drilling tools, and the occurrence of lost circulation greatly increases reservoir damage, drilling fluid allocation costs, prolongs the drilling cycle, and even brings Well control risks, resulting in great economic losses. At present, there is no anti-leakage product in the ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42C09K8/03C09K8/035
CPCC09K8/03C09K8/035C09K8/426C09K2208/08C09K2208/12
Inventor 王刚毅王昕立
Owner SICHUAN ZHENGRONG IND