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Preparation method of efficient temperature-resisting and salinity-resisting filtrate reducer for drilling fluid

A fluid loss control agent and drilling fluid technology, which is applied in the preparation of fluid loss control agent for drilling fluid and the field of drilling fluid fluid loss control agent, can solve the problem of poor high temperature resistance, high hydrolysis temperature and high cost of fluid loss control agent. It can achieve the effect of realizing waste recycling, simple processing technology and improving temperature resistance effect.

Active Publication Date: 2016-01-20
滨州市立德石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the fluid loss control agent has high hydrolysis temperature and high energy consumption, and the use of refined cotton and acrylic fibers as raw materials has high cost; moreover, the obtained fluid loss control agent has poor high temperature resistance

Method used

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  • Preparation method of efficient temperature-resisting and salinity-resisting filtrate reducer for drilling fluid
  • Preparation method of efficient temperature-resisting and salinity-resisting filtrate reducer for drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 80g waste acrylic fiber is washed, after drying, join in 3 liters of reaction flasks. Then add 80g of sodium thiocyanate and 100g of water into the reaction bottle, heat up to 70°C under stirring, until the waste acrylic fiber is completely dissolved, pour the dissolved acrylic fiber material into the water tank, solidify into sheet polyacrylonitrile, and bake at 90°C Let dry for 8 hours. The obtained polyacrylonitrile is pulverized in a pulverizer and screened through a 200-mesh screen to obtain a raw material with a particle size of polyacrylonitrile finer than 200 mesh. Take 40g of this raw material and add it to 50g of 20wt% NaOH aqueous solution under strong stirring, raise the temperature to 80°C, and react for 10 minutes to partially hydrolyze polyacrylonitrile to a degree of hydrolysis of 40%, and send it to a small spray drying tower for drying to obtain product A.

Embodiment 2

[0035] 80g waste acrylic fiber is washed, after drying, join in 3 liters of reaction flasks. Then add 80g of sodium thiocyanate and 100g of water into the reaction bottle, heat up to 70°C under stirring, until the waste acrylic fiber is completely dissolved, then pour the dissolved acrylic fiber material into the water tank, and solidify into sheet polyacrylonitrile, at 90°C Let dry for 8 hours. The obtained polyacrylonitrile is pulverized in a pulverizer and screened through a 100-mesh screen to obtain a raw material with a particle size of polyacrylonitrile finer than 100 mesh. Take 40g of this raw material and add it to 50g of 20wt% NaOH aqueous solution under strong stirring, raise the temperature to 80°C, and react for 15 minutes to partially hydrolyze polyacrylonitrile, the degree of hydrolysis is 42%, and send it to a small spray drying tower for drying to obtain product B.

Embodiment 3

[0037] 80g waste acrylic fiber is washed, after drying, join in 3 liters of reaction flasks. Then add 80g of sodium thiocyanate and 100g of water into the reaction bottle, heat up to 70°C under stirring, until the waste acrylic fiber is completely dissolved, then pour the dissolved acrylic fiber material into the water tank, and solidify into sheet polyacrylonitrile, at 90°C Let dry for 8 hours. The obtained polyacrylonitrile is pulverized in a pulverizer and screened through a 100-150 mesh screen to obtain a raw material with a polyacrylonitrile particle size of 100-150 mesh. Take 40g of this raw material and add it to 50g of 20wt% NaOH aqueous solution under strong stirring, raise the temperature to 80°C, and react for 20 minutes to partially hydrolyze polyacrylonitrile to a degree of hydrolysis of 45%, and send it to a small spray drying tower for drying to obtain product C.

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Abstract

The invention relates to a preparation method of an efficient temperature-resisting and salinity-resisting filtrate reducer for drilling fluid. The preparation method comprises the steps that (1) waste acrylic fibers are washed, air-dried and dissolved in sodium thiocyanate aqueous solution; (2) the waste acrylic fibers which are completely dissolved are poured into water for solid-liquid separation, and solids are dried and crushed to obtain polyacrylonitrile powder; (3) under the condition of stirring, the polyacrylonitrile powder is added into sodium hydroxide solution for partial hydrolysis of polyacrylonitrile; (4) spray drying is conducted to obtain the filtrate reducer. The filtrate reducer prepared through the method overcomes the defect that products obtained through a traditional production process is poor in high temperature resistance; by changing the structural form of the product and the degree of hydrolysis, the high temperature resistance effect is achieved; meanwhile, the product can also cooperate with other filtrate reducer products such as lignite and starch for compounding use, so the temperature resistance effect of the product is improved.

Description

technical field [0001] The invention relates to a preparation method of a fluid loss control agent for drilling fluid, in particular to a fluid loss control agent for drilling fluid with high temperature stability and high-efficiency fluid loss control effect. The fluid loss control agent is prepared from partially hydrolyzed polypropylene particles It belongs to the field of petroleum engineering technology. Background technique [0002] Fluid loss reducer is the most commonly used additive in petroleum drilling fluids. It can reduce the penetration of water in the drilling fluid into the formation, thereby stabilizing the well wall and protecting the formation. There are many kinds of fluid loss control agents, mainly including carboxymethyl cellulose, modified starch, phenolic resin, lignite, hydrolyzed polyacrylonitrile and chemically synthesized multi-component copolymerization products. Among them, hydrolyzed polyacrylonitrile can be processed from waste acrylic fiber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24
CPCC09K8/035C09K8/24C09K8/5083C09K2208/12
Inventor 张文郁李明春
Owner 滨州市立德石油科技有限公司