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Emulsion microsphere blocking agent for drilling fluid and preparation method of emulsion microsphere blocking agent

A technology of plugging agent and drilling fluid, which is applied in the field of emulsion microsphere plugging agent for drilling fluid and its preparation, and can solve problems such as difficult to achieve fluid loss reduction, well wall instability, and failure to be well resolved , to achieve good plugging and filtration loss reduction effect and good compatibility

Active Publication Date: 2017-05-10
TIANJIN TIANCHENG TUOYUAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Wellbore instability has always been a major problem in the field of oil drilling, which has always existed and has not been well resolved
However, the existing plugging agents are mainly used in soil slurry to have a better fluid loss reduction effect; for solid-free drilling fluids, common plugging agents (such as: starch, cellulose, resin, etc.) etc.) It is difficult to achieve the effect of filtration loss reduction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] Further, the present invention also provides a preparation method of the above-mentioned emulsion microsphere plugging agent for drilling fluid, the method comprising the following steps:

[0021] (1) Oil phase preparation: under normal temperature conditions, add 70-90 parts of white oil into the reaction kettle, slowly add emulsifier polyglycerol monostearate 5-10 parts under stirring condition of 60-70r / min, 0.5 to 2 parts of polyoxyethylene sorbitan monooleate, stirred for 30 to 60 minutes to obtain an oil phase, and set aside;

[0022] (2) Water phase preparation:

[0023] Add 100-130 parts of distilled water into another reaction kettle, start stirring at a speed of 60-70r / min, slowly add 10-15 parts of soda ash, stir for 20-40 minutes, then slowly add 15-25 parts of acrylic acid, N, N - 50-70 parts of dimethylacrylamide, 2-7 parts of vinyltrimethoxysilane, stirred for 50 minutes to obtain the water phase, and set aside;

[0024] (3) Aggregation:

[0025] Slowl...

Embodiment 1

[0031] The emulsion microsphere plugging agent for drilling fluid is prepared according to the following method:

[0032] (1) Oil phase preparation:

[0033] Under the condition of normal temperature, start the stirring, the rotating speed is 65r / min, add 80 parts of white oil into the reaction kettle, slowly add emulsifier polyglycerol stearate 7 parts, polyoxyethylene sorbitan monooleic acid 1 part of ester, stirred for 45min to obtain the oil phase, set aside;

[0034] (2) Water phase preparation:

[0035] Add 120 parts of distilled water into another reaction kettle, start stirring at 65r / min, slowly add 12 parts of soda ash, stir for 30 minutes, then slowly add 20 parts of acrylic acid, 60 parts of N,N-dimethylacrylamide, ethylene 5 parts of trimethoxysilane, stirred for 50min to obtain the water phase, set aside;

[0036] (3) Aggregation:

[0037] Slowly add the water phase obtained in step (2) into the oil phase obtained in step (1), turn on the cooling water and ad...

Embodiment 2

[0042]In order to investigate the fluid loss reduction effect of the product of Example 1 in the solid-free drilling fluid, the following 6 groups of parallel experiments were done, simulating the solid-free drilling fluid with clear water, adding 2wt% carboxymethylcellulose sodium salt (CMC ), modified starch, sodium polyanion cellulose, lignite resin, embodiment 1 product, investigate wherein pressure filtration loss. The test results are shown in Table 2. It can be seen from Table 2 that the fluid loss control effect of this patented product in solid-free drilling fluid is unparalleled by conventional plugging fluid loss control agents.

[0043] Table 2.

[0044] serial number project Medium pressure fluid loss 1 clear water lost all 2 Clear water+2wt%CMC lost all 3 Clear water+2wt% modified starch lost all 4 Clear water+2wt% sodium polyanion cellulose lost all 5 Clear water+2wt% lignite resin lost all 6 Clear water...

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Abstract

The invention belongs to the field of drilling fluid additives, and particularly relates to an emulsion microsphere blocking agent for drilling fluid and a preparation method of the emulsion microsphere blocking agent. The emulsion microsphere blocking agent comprises the following components in parts by weight in a manner of inverse emulsion polymerization: 70-90 parts of white oil, 5-10 parts of polyglycerol monostearate, 0.5-2 parts of polyoxyethylene dehydrated sorbitol polyoxyethylene sorbitan monooleate, 50-70 parts of N,N-dimethyl acrylamide, 100-130 parts of distilled water, 10-15 parts of sodium carbonate, 15-25 parts of crylic acid, 2-7 parts of vinyl trimethoxyl silane, 0.2-0.5 part of a complexing agent, 0.5-1.5 parts of an initiator and 0.02-0.05 part of a chain terminating agent. A prepared product is of a micro nano core-shell structure, is capable of effectively blocking micro cracks of different grades, is good in blocking de-filtration effect and has a lubrication effect which can be compared with that of a lubricant.

Description

technical field [0001] The invention belongs to the field of additives for drilling fluids, in particular to an emulsion microsphere plugging agent for drilling fluids and a preparation method thereof. Background technique [0002] Wellbore instability has always been a major problem in the field of oil drilling, which has always existed and has not been well resolved. More than 90% of wellbore instability occurs in shale formations. Wellbore instability not only affects drilling speed, logging and cementing quality, but also makes it impossible to drill to the target layer in some areas, affecting the realization of exploration goals. [0003] For mud shale formations with well-developed bedding and fractures, in order to prevent wellbore instability, the drilling fluid is required to have strong sealing properties, which can effectively seal formation bedding and fractures, prevent drilling fluid and its filtrate from entering the formation, and improve formation performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44C09K8/035C08F222/38C08F220/06C08F230/08
CPCC09K8/035C09K8/426C09K8/44C09K2208/34C08F220/54C08F2/32C08F220/06C08F230/08
Inventor 杨静冯海平刘学明王义虎全晓虎冯奇刘传海李昂
Owner TIANJIN TIANCHENG TUOYUAN TECH DEV
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