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A fluid loss reducer for water-based drilling fluid based on modified psyllium seed husk and its preparation method

A technology of water-based drilling fluid and psyllium seed husks, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as environmental impact, increase temperature resistance, be easy to popularize, and increase filtration loss. Effect

Active Publication Date: 2021-02-02
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 in the current low (no) solid phase drilling fluid, the fluid loss control agent for drilling fluid often uses synthetic polymers, which has a great impact on the environment, and proposes a modified plantain seed based Fluid loss reducer for shell water-based drilling fluid and preparation method

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0024] The specific preparation method of the present invention comprises the following steps:

[0025] 1. Pretreatment of psyllium seed husk

[0026] (1) Freshly clean the psyllium seed husk with water, put it in an oven, and dry it at 100°C±5°C for 5 hours;

[0027] (2) Pulverize the dried psyllium seed husk with a pulverizer, test with a standard inspection sieve, pulverize to 800 mesh to 1000 mesh, and set aside.

[0028] 2. Preparation of fluid loss control agent for water-based drilling fluid based on modified psyllium seed husk

[0029] (1) Add 60~80g of pretreated psyllium seed husks into a 500mL three-necked flat-bottomed flask, add 6~10g of NaOH, then slowly add 300g of distilled water, stir at a low speed, and heat to 60~80 after the NaOH is completely dissolved. ℃, continue to stir and react for 40~60min;

[0030] (2) Slowly add 20~30g NaOH to the above reactor, stir slowly until it is completely dissolved, then slowly add 50~80g water, keep the temperature at 3...

Embodiment 1

[0038] Add 60g of pretreated psyllium seed husks into a 500mL three-necked flat-bottomed flask, add 6g of NaOH, then slowly add 300g of distilled water, stir at a low speed, after the NaOH is completely dissolved, heat to 60°C, and continue to stir for 40min; Add 20g of NaOH, stir slowly until it is completely dissolved, then slowly add 50g of water, keep the temperature at 30°C, and continue to stir for 15min; add 20g of 95% ethanol dropwise, after the addition is complete, keep the temperature at 40°C, and stir at a low speed for 30min; weigh Dissolve 10 g of chloroacetic acid in 20 g of 95% ethanol, stir to dissolve it; weigh 6 g of NaOH and dissolve it in 20 g of water, stir to dissolve it, and mix and react to generate sodium chloroacetate; add the sodium chloroacetate solution prepared in the previous step, Keep the temperature at 40°C, and etherify for 100 minutes; add 10 g of hydrophobic nano-calcium carbonate 601#, and continue to stir for 30 minutes; remove the liquid...

Embodiment 2

[0040]Add 70g of pretreated psyllium seed husks into a 500mL three-neck flat-bottomed flask, add 8g of NaOH, then slowly add 300g of distilled water, stir at a low speed, after the NaOH is completely dissolved, heat to 70°C, and continue to stir for 50min; Add 25g of NaOH, stir slowly until it is completely dissolved, then slowly add 70g of water, keep the temperature at 35°C, and continue stirring for 18min; add 30g of 95% ethanol dropwise, after the addition is complete, keep the temperature at 45°C, and stir at a low speed for 40min; weigh Dissolve 15 g of chloroacetic acid in 20 g of 95% ethanol, stir to dissolve it; weigh 8 g of NaOH and dissolve it in 20 g of water, stir to dissolve it, and mix and react to generate sodium chloroacetate; add the sodium chloroacetate solution prepared in the previous step, Keep the temperature at 45°C, and etherify for 100 minutes; add 15g of hydrophobic nano-calcium carbonate 602#, and continue to stir for 30 minutes; remove the liquid ph...

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Abstract

The present invention provides a water-based drilling fluid filtrate loss reducer based on modified plantain seed husks and a preparation method thereof. The water-based drilling fluid filtrate loss reducer based on the modified plantain seed husks includes plantain seed husk powder, NaOH, 95% ethanol, chloroacetic acid, hydrophobic nano-calcium carbonate and water. The water-based drilling fluid filtrate loss reducer is prepared by crushing, purification, alkalization and carboxymethylation of the plantain seed husks with high filtrate loss reducing effect and plugging performance, and combination with the hydrophobic nano-calcium carbonate, and the water-based drilling fluid filtrate loss reducer based on the modified plantain seed husks is finally formed by hydrophobic interaction to improve system anti-temperature ability and filtrate loss reducing effect. The water-based drilling fluid filtrate loss reducer has obvious effects. After the water-based drilling fluid filtrate loss reducer is aged at 150 DEG C for 24 hours, the filter loss is remained at a relatively low level (4.3 mL). At the same time, the water-based drilling fluid filtrate loss reducer is non-toxic and has no adverse effect on the environment. The acute toxicity EC50 is greater than 50,000, and the water-based drilling fluid filtrate loss reducer can be completely degraded. The water-based drilling fluid filtrate loss reducer is an efficient drilling fluid filtrate loss reducer. The method has the advantages of being simple, easy in operation and easy in popularization.

Description

technical field [0001] The invention relates to a fluid loss reducer for drilling fluid. Specifically, during the drilling process, the drilling fluid needs to have a good fluid loss control effect, which prevents excessive drilling fluid filtrate from entering the formation, and is beneficial to reducing well wall instability and oil and gas layers. Injury and other engineering problems. Background technique [0002] In the oil and gas industry, drilling operations are required to connect the strata to be developed with the surface for subsequent oil recovery operations. During the drilling process, drilling fluid circulation is required, one of which is to minimize the fluid loss of the drilling fluid in the formation, and the fluid loss performance is the basic performance during the drilling process. The fluid loss characteristics of the drilling fluid in the formation are generally measured by API filter devices (static fluid loss), and the obtained pressure filtration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/04C09K2208/10
Inventor 蓝强张妍徐运波郑成胜张鹏刘振东吴雄军陈健于雷
Owner 中石化石油工程技术服务有限公司
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