Preparation method of cationic plugging agent for drilling fluid

A cationic, plugging agent technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as formation clay mineral expansion, damage to formation cementation stability, and borehole wall tensile fracture, etc., to achieve sealing Blocking, strong blocking, easy to obtain effect

Active Publication Date: 2017-12-22
XUZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the geological situation, it is found that after the water-based drilling fluid filtrate enters the formation fractures and pores, it will cause the formation clay minerals to expand, resulting in local tensile fracture of the borehole wall, and at the same time, the drilling fluid filtrate will also damage the cementation stability of the formation.

Method used

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  • Preparation method of cationic plugging agent for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Dissolve 30 parts of butyl acrylate in a small amount of deionized water, mix with 45 parts of styrene and 30 parts of dimethyl diallyl ammonium chloride, add 52 parts of deionized water to prepare the water phase, add 0.32 parts by weight of emulsifier SDS , OP-10, stir in a shear emulsification mixer at a shear speed of 500r / min for 1h to emulsify and disperse to form an emulsion. Transfer the emulsion into the reaction kettle, add 0.42 parts by weight of regulator while stirring, and raise the temperature. Weigh 0.21 parts by weight of the initiator to prepare an aqueous solution. When the temperature in the reactor reaches 65-80°C, add 0.21 parts by weight of the initiator to the system twice, adjust the stirring speed to 300-400r / min, and keep warm for 6 After ~7h, the material is discharged and cooled to obtain a cationic plugging agent.

[0011] Above-mentioned regulator preparation method is as follows:

[0012] Add 2 parts by weight of phenol, 5 parts by weig...

Embodiment 2

[0014] Exactly the same as Example 1, the difference is: 30 parts of styrene added, 15 parts of butyl acrylate, 15 parts of dimethyl diallyl ammonium chloride, 30 parts of deionized water, 0.18 parts of emulsifier, 0.24 parts of regulator Parts, 0.12 parts of initiator.

Embodiment 3

[0016] Exactly the same as Example 1, the difference is: 45 parts of styrene added, 30 parts of butyl acrylate, 15 parts of dimethyl diallyl ammonium chloride, 45 parts of deionized water, 0.27 parts of emulsifier, and 0.36 parts of regulator Parts, 0.18 parts of initiator.

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Abstract

The invention discloses a preparation method of a cationic plugging agent for a drilling fluid. The cationic plugging agent is prepared by emulsion polymerization from raw materials in parts by weight as follows: 30-90 parts of styrene, 5-75 parts of butyl acrylate and 15-75 parts of dimethyl diallyl ammonium chloride. Monomers are initiated by an initiator to be subjected to a polymerization reaction, and the cationic plugging agent with the macromolecular chain is obtained; with addition of a small quantity of the product to the drilling fluid, the filtration loss of the drilling fluid and the invasion depth in the sand bed can be effectively reduced, plugging of underground pore cracks is realized, and drilling safety is guaranteed.

Description

technical field [0001] The invention relates to the field of preparation of a plugging agent for drilling fluid, and relates to a preparation method of a ternary polymer. Background technique [0002] In recent years, due to the increasing demand for oil and gas around the world, while people are striving to improve drilling technology and expand oil and gas production, oil exploration technology is also gradually developing towards more complex formations. Ultra-deep wells, high-pressure wells and complex wells are becoming more and more The more the formations are drilled, the more complex the formations will be. Especially in the drilling process of extended-reach horizontal wells in shale oil and gas, the formations are prone to serious problems such as leakage, collapse, diameter shrinkage and slurry production. In addition, tight oil and gas storage space and clay Due to the complexity of minerals, my country has not yet fully mastered the key technologies in the develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/18C08F226/02C08F2/30C08F2/26C08F2/38C09K8/035
CPCC08F212/08C09K8/035C08F220/1804C08F226/02
Inventor 邵亚
Owner XUZHOU NORMAL UNIVERSITY
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