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Humic acid modified filtrate reducer for water-based drilling fluid and preparation method and drilling fluid

A technology of water-based drilling fluid and fluid loss reducer, applied in the field of water-based drilling fluid, can solve problems such as poor salt resistance and poor temperature resistance, reduce fluid loss, meet environmental protection requirements, and improve filter cake quality Effect

Inactive Publication Date: 2019-12-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a kind of humic acid modified water-based drilling fluid fluid loss control agent and preparation method and water-based drilling fluid, to solve the fluid loss control agent in the prior art, mostly poor temperature resistance, Technical problem with poor resistance to salt

Method used

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  • Humic acid modified filtrate reducer for water-based drilling fluid and preparation method and drilling fluid
  • Humic acid modified filtrate reducer for water-based drilling fluid and preparation method and drilling fluid
  • Humic acid modified filtrate reducer for water-based drilling fluid and preparation method and drilling fluid

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Experimental program
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Effect test

Embodiment 1

[0069] Preparation of humic acid modified water-based drilling fluid fluid loss control agent:

[0070] (1) Reagent preparation:

[0071] The initiator adopts ammonium persulfate-sodium bisulfite;

[0072] Weigh 10g of modified silica TSP-L12 and dissolve it in 10ml of ethanol, then add 30ml of water to make a solution;

[0073] (2) Weigh 20g of acrylamide, 50g of 2-acrylamido-2-methylpropanesulfonic acid, 30g of sodium humate and 400ml of water into the reaction vessel;

[0074] (3) The solution configured in step (1) is added to the reaction vessel, and stirred and dissolved at a stirring rate of 200 rad / min;

[0075] (4) Use the NaOH solution with a mass fraction concentration of 20% to adjust the pH value of the reaction solution in the reaction vessel to 8; then heat until the temperature of the reaction solution in the reaction vessel is 70° C., then feed nitrogen for 30 minutes, and the feed of nitrogen The rate is 0.2L / min;

[0076] (5) Add 2 g of ammonium persulfa...

Embodiment 2

[0079] Preparation of humic acid modified water-based drilling fluid fluid loss control agent:

[0080] (1) Reagent preparation:

[0081] The initiator adopts ammonium persulfate-sodium bisulfite;

[0082] Weigh 5g of modified silica TSP-L12 and dissolve it in 5ml of ethanol, then add 3ml of water to make a solution;

[0083] (2) Weigh 25g of acrylamide, 50g of 2-acrylamido-2-methylpropanesulfonic acid, 25g of sodium humate and 300ml of water into the reaction vessel;

[0084] (3) The solution configured in step (1) is added to the reaction vessel, and stirred and dissolved at a stirring rate of 300 rad / min;

[0085] (4) Use the NaOH solution with a mass fraction concentration of 20% to adjust the pH value of the reaction solution in the reaction vessel to 7; then heat until the temperature of the reaction solution in the reaction vessel is 60°C-80°C, then feed nitrogen into the nitrogen for 25min The feeding rate is 0.3L / min;

[0086] (5) Add 3 g of ammonium persulfate-so...

Embodiment 3

[0089] Preparation of humic acid modified water-based drilling fluid fluid loss control agent:

[0090] (1) Reagent preparation:

[0091] The initiator adopts potassium persulfate;

[0092] Weigh 10g of modified silica TSP-L12 and dissolve it in 10ml of ethanol, then add 30ml to make a solution;

[0093] (2) Weigh 40g of acrylamide, 30g of 2-acrylamido-2-methylpropanesulfonic acid, 30g of sodium humate and 400ml of water into the reaction vessel;

[0094] (3) The solution configured in step (1) is added to the reaction vessel, and stirred and dissolved at a stirring rate of 100 rad / min;

[0095] (4) Use the NaOH solution with a mass fraction concentration of 20% to adjust the pH value of the reaction solution in the reaction vessel to 9; then heat until the temperature of the reaction solution in the reaction vessel is 80° C., then feed nitrogen into the nitrogen for 35min. 0.3L / min;

[0096] (5) Add 2 g of potassium persulfate into the reaction vessel under a nitrogen atm...

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Abstract

The invention provides a humic acid modified filtrate reducer for a water-based drilling fluid and a preparation method and the water-based drilling fluid and aims to solve the technical problems thatin the prior art, a filtrate reducer is generally poor in both temperature resistance and salt resistance. The filtrate reducer is prepared from sodium humate as a raw material through grafting modification on the sodium humate with 2-acrylamide group-2-methallyl sulfonate, acrylamide and silicon dioxide through a copolymerization reaction. The temperature resistance of the filtrate reducer provided by the invention can be improved to 230 DEG C, the salt resistance can be up to 5% or greater, in addition, the quality of filter cakes can be effectively improved in application, and the filter loss can be reduced; and in addition, the filtrate reducer is nontoxic and degradable, environment protection requirements can be met, environment pollution can be avoided, and stratums and oil productquality are not damaged.

Description

technical field [0001] The invention relates to a fluid loss reducer, in particular to a humic acid-modified fluid loss reducer for water-based drilling fluid, a preparation method and a water-based drilling fluid. Background technique [0002] During the drilling process, due to the pressure difference, the water in the drilling fluid will inevitably leak into the formation through the wellbore wall, causing the drilling fluid to lose water. As the water enters the formation, the clay particles in the drilling fluid adhere to the well wall to form a "filter cake", forming a filter cake well wall. Since the well wall of the filter cake is much denser than the original well wall, on the one hand, it prevents the drilling fluid from further dehydration, and on the other hand, it plays a role in protecting the well wall. However, during the formation of the filter cake wall, too much water is lost by filtration, the filter cake is too thick, and fine clay particles enter the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/56C08F220/58C08F230/08C09K8/035
CPCC08F289/00C09K8/035C08F220/56
Inventor 蒲晓林冷文龙任妍君李方王贵
Owner SOUTHWEST PETROLEUM UNIV
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