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Modified enteromorpha prolifera-based composite filtrate reducer for drilling fluid and preparation method thereof

A fluid loss control agent and drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, reagents, etc., can solve the problems of environmental protection hazards, resistance to high temperature filtration loss and difficult biodegradation, etc., to achieve increased filtration Loss and plugging effect, improve the effect of temperature resistance and fluid loss reduction

Active Publication Date: 2021-01-19
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the commonly used anti-high temperature fluid loss reducer in the current drilling fluid is difficult to biodegrade and has a relatively large environmental protection hazard, and proposes a composite fluid loss reducer for drilling fluid based on modified enteromorpha and its preparation method

Method used

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  • Modified enteromorpha prolifera-based composite filtrate reducer for drilling fluid and preparation method thereof
  • Modified enteromorpha prolifera-based composite filtrate reducer for drilling fluid and preparation method thereof

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preparation example Construction

[0034] The specific preparation method of the present invention comprises the following steps:

[0035] 1. Pretreatment of Enteromorpha

[0036] (1) Use deionized water to clean Enteromorpha, remove impurities such as sand, mud and shells, and wash for 5 to 10 times until there are no impurities, no color in drained water, and the concentration of drained salt is lower than 10ppm;

[0037] (2) Vacuum dry at 60°C for 20 hours. After drying, use a pulverizer to pulverize, test with a standard inspection sieve, pulverize to 800-1000 mesh, and set aside.

[0038] Among them, the Enteromorpha used is a plant of the Ulvaceae family of Chlorophyceae. The algal body is bright green, composed of a single layer of cells, with an adhesive ribbon structure, rich in carbohydrates, proteins, crude fibers, amino acids, fatty acids, vitamins and various minerals. Substances are widely distributed in the Yellow Sea, Bohai Sea and East China Sea in my country.

[0039] 2. Preparation of modifi...

Embodiment 1

[0049] (1) Add 300g NaHSO to a 2000mL three-neck round bottom flask 3 , add 500mL of deionized water, stir at 300rpm until completely dissolved; raise the temperature to 80°C, slowly add 265g of 1,2-propylene oxide dropwise, and finish the drop within 3h. After the dropwise addition, continue the reaction for 2h. After the reaction is completed, cool to room temperature, recrystallize the solid after suction filtration with deionized water, repeat 3 times to obtain a white solid crystalline sulfonation modifier, use a pulverizer to pulverize, and use a standard inspection sieve to pulverize to 800 mesh~ 1000 mesh, stand-by; add 200g of pretreated Enteromorpha into a 2000mL three-neck flat-bottomed flask, slowly add 50g of the sulfonated modifier prepared earlier, stir at a low speed of 100rpm for 30min, after the addition, the temperature rises to 40°C, increase the stirring speed to 2000rpm, and stir for 1h. During the reaction, strictly control the pH of the system to be bet...

Embodiment 2

[0052] (1) Add 400g NaHSO to a 2000mL three-neck round bottom flask 3 , add 500mL of deionized water, stir at 300rpm until completely dissolved; raise the temperature to 80°C, slowly add 366g of epichlorohydrin dropwise, and finish dropping within 3h. After the dropwise addition, continue to react for 2h. , cooled to room temperature, the solid after suction filtration was recrystallized with deionized water, and repeated 3 times to obtain a white solid crystalline sulfonated modifier, which was pulverized with a pulverizer, tested with a standard inspection sieve, pulverized to 800-1000 mesh, and waited for Use: Add 300g of pretreated Enteromorpha into a 2000mL three-necked flat-bottomed flask, slowly add 70g of the sulfonated modifier prepared earlier, stir at a low speed of 100rpm for 40min, after the addition, the temperature rises to 45°C, and the Increase the stirring speed to 2000rpm and stir for 2 hours. During the reaction, strictly control the pH of the system to be ...

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Abstract

The invention discloses a modified enteromorpha prolifera-based composite filtrate reducer for drilling fluid. The composite filtrate reducer comprises modified enteromorpha prolifera, a temperature stabilizer, micron calcium carbonate, nano silicon dioxide and a dispersing agent. The preparation method comprises the steps: adding deionized water and the modified enteromorpha prolifera into a high-pressure homogenizer, homogenizing, adding the temperature stabilizer, and homogenizing; adjusting the pH value of the system, adding micron calcium carbonate, and continuing homogenizing; adding nano silicon dioxide, homogenizing, then adding the dispersing agent, and continuing homogenizing; and drying and crushing the product to obtain the modified enteromorpha prolifera-based composite filtrate reducer for the drilling fluid. After 2.0 wt% of the modified enteromorpha prolifera composite filtrate reducer prepared by the method is added into base slurry at normal temperature, the high-temperature and high-pressure (180 DEG C / 3.5 MPa) filtrate loss of the base slurry is reduced from 55 mL to 12 mL, the plugging rate of a 500 mD rock core is increased from 35% to 92%, and the treating agent is non-toxic, has no adverse effect on the environment and has acute toxicity EC50 greater than 30000.

Description

technical field [0001] The invention relates to a fluid loss reducer for drilling fluid and a preparation method thereof. Specifically, during the drilling process, the drilling fluid needs to have a certain function of the fluid loss reducer, so as to reduce the penetration of the drilling fluid filtrate into the formation and avoid causing corresponding well wall instability. , reservoir damage and other issues. Background technique [0002] The formations encountered during the drilling process are diverse, ranging from mudstone, shale, sandstone, limestone, carbonate rock and their composite rocks, with different porosity and permeability, and there may be fractures or In karst-cavity formations, at this time, the drilling fluid filtrate may enter the formation to a large extent. When the formation fluid and borehole wall rocks come into contact with the drilling fluid, it may cause wellbore instability, and in severe cases, may cause wellbore collapse. Therefore, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/42
CPCC09K8/03C09K8/426C09K2208/12Y02P20/141
Inventor 蓝强张妍徐运波郑成胜刘振东于雷吴雄军陈健张虹
Owner 中石化石油工程技术服务有限公司
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