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Filtrate reducer for water-based drilling fluid and preparation method of filtrate reducer

A technology of water-based drilling fluid and fluid loss control agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low anti-pollution performance, poor temperature resistance performance, poor performance, etc., and achieve good economic benefits and society, good temperature resistance, and simple equipment conditions

Active Publication Date: 2013-11-20
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluid loss control agents for drilling fluids in the prior art generally have the following shortcomings: 1. The anti-pollution performance is low, the temperature resistance performance is poor under high-density conditions, and it is easy to thicken.
2. There are many kinds of fluid loss control agents currently in use, which are expensive and have poor performance in resisting high temperature and calcium and magnesium ion pollution
3. At present, sulfonated drilling fluid fluid loss additives are mostly used in high-temperature and high-pressure wells. The temperature resistance of sulfonated materials is relatively weak. At the same time, the weak temperature resistance of sulfonated materials will also result in insufficient temperature resistance of the drilling fluid system, resulting in a large amount of high-temperature and high-pressure filtration, causing wellbore instability and downhole accidents
The use of existing fluid loss reducers for drilling fluids cannot meet the above complex geological conditions

Method used

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  • Filtrate reducer for water-based drilling fluid and preparation method of filtrate reducer
  • Filtrate reducer for water-based drilling fluid and preparation method of filtrate reducer
  • Filtrate reducer for water-based drilling fluid and preparation method of filtrate reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Acrylamide: 35%, 2-acrylamido-2-methylpropanesulfonic acid: 20%, maleic anhydride: 25%, sodium allylsulfonate: 20%, initiator: 0.1%~0.2%, the rest is water (both in mass ratio). Add appropriate amount of water and acrylamide: 35%, 2-acrylamido-2-methylpropanesulfonic acid: 20% in the closed reaction kettle according to the order of addition, start stirring, and use potassium hydroxide solution to adjust the pH value to 4 ~5. Stir fully to dissolve the raw materials into the water, heat the reaction kettle to 60℃~70℃, maintain a constant temperature, and add maleic anhydride and sodium allyl sulfonate. After feeding nitrogen for 30 minutes, the amount of feeding nitrogen is twice the volume of the reactor, stirring and slowly and uniformly adding 0.1% initiator, stirring for 1 hour, and stopping to maintain a constant temperature. Allow it to cool naturally to room temperature, then dry it at 100°C to 110°C until the moisture content is lower than 8%, and then crush it ...

Embodiment 2

[0047] The present invention includes acrylamide: 30%, 2-acrylamido-2-methylpropanesulfonic acid: 20%, maleic anhydride: 20%, sodium allyl sulfonate 30%, initiator: 0.2%, and the rest is water (both in mass ratio). Add an appropriate amount of water and acrylamide: 25%, 2-acrylamido-2-methylpropanesulfonic acid: 20% in the closed reaction kettle according to the order of addition, start stirring, and use sodium hydroxide solution to adjust the pH value to 4 ~5. Stir fully to dissolve the raw materials into water. When the temperature of the reactor reaches 60°C, add 25% maleic anhydride and 30% sodium allyl sulfonate. After feeding nitrogen for 30 minutes, the amount of nitrogen feeding is twice the volume of the reactor, stirring and slowly and uniformly adding 0.2% initiator, stirring and reacting for 1 hour, and stopping heating. After cooling, dry at 100°C and crush to 350 mesh. That is, the high-temperature fluid loss reducer for water-based drilling fluid of the presen...

Embodiment 3

[0049] The present invention includes acrylamide: 40%, 2-acrylamido-2-methylpropanesulfonic acid: 20%, maleic anhydride: 20%, sodium allyl sulfonate 20%, initiator: 0.1%, and the rest is water (both in mass ratio). Add appropriate amount of water and acrylamide: 40%, 2-acrylamido-2-methylpropanesulfonic acid: 20% in the closed reaction kettle according to the order of addition, start stirring, and use potassium hydroxide solution to adjust the pH value to 4 ~5. Stir fully to dissolve the raw materials into the water. When the temperature of the reactor reaches 80°C, add maleic anhydride and sodium allyl sulfonate. After feeding nitrogen for 35 min, the amount of nitrogen feeding was 3 times the volume of the reactor, stirred and slowly and uniformly added 0.1% initiator, stirred for 1 h, and stopped heating. After cooling, dry at 110°C and crush to 200 mesh. That is, the high-temperature fluid loss reducer for water-based drilling fluid of the present invention is obtained. ...

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Abstract

The invention discloses a filtrate reducer for a water-based drilling fluid and a preparation method of the filtrate reducer. The filtrate reducer for the water-based drilling fluid comprises the following components in percentage by mass: 30-40 percent of acrylamide, 10-20 percent of 2-acryloylmino-2-methylpropyl sulfonate, 20-30 percent of maleic anhydride, 20-40 percent of sodium allylsulfonate, 0.1-0.2 percent of initiator and the balance of water. The filtrate reducer disclosed by the invention has the advantages of low biotoxicity, strong resistance to pollution of calcium ions and magnesium ions and good temperature resistance; and the requirements of the drilling of a gypsum-salt layer on a drilling fluid treating agent can be satisfied, and meanwhile, the filtrate reduction effect is still good in the high-density condition.

Description

technical field [0001] The invention relates to a fluid loss reducer and a preparation method thereof, in particular to a fluid loss reducer for water-based drilling fluid and a preparation method thereof. Background technique [0002] Although a lot of research has been done on fluid loss control agents for drilling fluids at home and abroad, a variety of fluid loss control agents such as modified cellulose, starch, humic acid, lignin, tannins, and polymers have been developed. And a lot of application results have been obtained in the drilling of different oil and gas fields. For example, Chinese Patent No. "201010172409.3" discloses a method for preparing a high-temperature and salt-resistant fluid loss reducer for drilling fluids. The mass ratio of methylpropanesulfonic acid, acrylamide, lignite, water, initiator and auxiliary materials is 2-3: 5-7: 7-10: 15-20: 0.1-0.2: 0.1-0.2: 25-30; Preparation of mother liquor: Add 2-acrylamide-2-methylpropanesulfonic acid and acr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F220/56C08F228/02C08F222/06C08F220/58
Inventor 王京光杨斌张小平黎金明董宏伟李慧升李华伟吴满祥王勇强刘伟林海赵向阳郑玉辉崔贵涛李博
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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