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Filtrate reducer and preparation method thereof, and water-based drilling fluid and application thereof

A technology for water-based drilling fluid and fluid loss control agent, which is applied in earth-moving drilling, chemical instruments and methods, and wellbore flushing, etc., can solve the problem that the temperature and salt resistance of fluid loss control agent cannot be balanced with environmental friendliness, etc. To achieve the effect of good filtration performance, high synthesis efficiency and good compatibility

Active Publication Date: 2020-06-09
CHINA PETROCHEMICAL CORP +3
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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 fluid loss control agent and its preparation method and water-based drilling fluid and Its application, the fluid loss reducer not only has the performance of salt resistance and high temperature resistance, but also meets the environmental protection performance requirements of "non-toxic and easy to degrade". In addition, it also has the performance of viscosity increasing and cutting

Method used

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  • Filtrate reducer and preparation method thereof, and water-based drilling fluid and application thereof
  • Filtrate reducer and preparation method thereof, and water-based drilling fluid and application thereof
  • Filtrate reducer and preparation method thereof, and water-based drilling fluid and application thereof

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preparation example Construction

[0032] The second aspect of the present invention provides a method for preparing a fluid loss control agent, wherein the method includes:

[0033] (1) Carry out first contact with emulsifier and water, make the first mixed solution;

[0034] (2) In the presence of an initiator, the first mixed solution and the monomer are polymerized to obtain an emulsion solution; and the emulsion solution is purified and extracted, and the obtained extract is subjected to shear granulation and drying dried and comminuted to produce a second polymer;

[0035] (3) performing a second contact with the first polymer, water and the second polymer to obtain a second mixed solution;

[0036] (4) Centrifuging, washing, drying and grinding the second mixed solution to obtain the fluid loss control agent;

[0037]Wherein, the first polymer is a natural polymer;

[0038] Wherein, the monomer is selected from methyl-4-vinylbenzoate, dimethoxymethylvinylsilane, 1,3-divinyltetramethyldisiloxane, (2-br...

Embodiment 1

[0080] This example is to illustrate the fluid loss control agent prepared by the method of the present invention.

[0081] (1) Synthesis of the second polymer A

[0082] Add 80mL of deionized water and 1.2g of emulsifier Tween80 into a 250mL three-necked flask equipped with a reflux device, control the stirring speed at 1000r / min, stir for 30min to mix evenly, during which the temperature is controlled at 60°C, and 10% sodium hydroxide solution is used to Adjust the pH value to 6, then dissolve 0.5g of ammonium persulfate in 20g of 1,3-divinyltetramethyldisiloxane monomer and add it dropwise to the aqueous solution through a constant pressure funnel, and the stirring speed is 2000r / min, The dropping time of 1,3-divinyltetramethyldisiloxane monomer is controlled at 30min (with the dropping rate of 20g / 30min), and the monomer is added and then stirred for 30min, and high-purity nitrogen is introduced Oxygen is driven away, the temperature is gradually raised to the reaction te...

Embodiment 2

[0087] This example is to illustrate the fluid loss control agent prepared by the method of the present invention.

[0088] (1) Synthesis of the second polymer B

[0089] Add 100mL of deionized water and 1.2g of emulsifier OP-10 into a 250mL three-necked flask equipped with a reflux device, control the stirring speed at 950r / min, stir for 35min to mix evenly, during which the temperature is controlled at 50°C, and oxidized with 10% hydrogen The sodium solution adjusts the pH value to be 6.5, and then the methyl-4-vinyl benzoate monomer dissolved in 24g of 0.5g potassium persulfate is added dropwise in the aqueous solution through a constant pressure funnel, and the stirring speed is 2000r / min. Base-4-vinyl benzoate monomer was added dropwise at a rate of 0.5g / min. After the monomer was added dropwise, continue stirring for 30 minutes, and high-purity nitrogen was introduced to drive oxygen, and the temperature was gradually raised to the reaction temperature. 78°C, polymerize...

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Abstract

The invention relates to the technical field of oil exploitation, and discloses a filtrate reducer and a preparation method thereof, and a water-based drilling fluid and application thereof. The filtrate reducer comprises a first polymer and a second polymer, wherein the first polymer is a natural high-molecular polymer; the second polymer is prepared by carrying out a polymerization reaction on an emulsifier and a monomer in the presence of an initiator; and the monomer is one or more selected from a group consisting of methyl-4-vinylbenzoate, dimethoxymethylvinylsilane, 1,3-divinyltetramethyldisiloxane, (2-bromovinyl)trimethylsilane, 4-vinyl-1-cyclohexene and acetic acid-1-cyano-2-propenyl ester. The water-based drilling fluid containing the filtrate reducer has salt resistance and high-temperature resistance, meets the requirement for the environmental protection properties of no toxicity and easy degradation, and also has tackifying and shear strength improving properties.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a fluid loss reducer, a preparation method thereof, a water-based drilling fluid and an application thereof. Background technique [0002] With the sharp increase in energy demand from all walks of life in the world and the continuous development of drilling technology, it is inevitable to exploit oil and gas in deep formations. [0003] However, as the drilling depth continues to increase, the temperature at the bottom of the well is too high, and the drilling encounters salt-gypsum formations, etc., which will have a great impact on the performance of the drilling fluid. This requires that the drilling fluid can still maintain good performance in the downhole environment of high temperature and high salinity. [0004] In addition, with the development of drilling technology and the diversification of formations encountered, more and more drilling fluid problems ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24E21B21/00
CPCC09K8/035C09K8/24E21B21/003
Inventor 刘均一郭保雨李公让李炳太王旭东赵红香李秀灵
Owner CHINA PETROCHEMICAL CORP
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