Temperature-resistant and salt-resistant water-based drilling fluid filtrate reducer and preparation method thereof

A technology of fluid loss reducer and drilling fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost, poor temperature and salt resistance, etc., and achieve enhanced salt resistance and improved temperature resistance Ability, the effect of improving the ability of temperature resistance and salt resistance

Active Publication Date: 2021-07-23
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current high-performance fluid loss reducers Driscal-D and Dristemp used in drilling are all imported pro

Method used

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  • Temperature-resistant and salt-resistant water-based drilling fluid filtrate reducer and preparation method thereof
  • Temperature-resistant and salt-resistant water-based drilling fluid filtrate reducer and preparation method thereof
  • Temperature-resistant and salt-resistant water-based drilling fluid filtrate reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 520g of water, 60g of acrylamide, 43.6g of 2-acrylamido-2 methylpropanesulfonic acid, 11.7g of N-vinylpyrrolidone to a four-necked flask equipped with a stirrer, reflux condenser, thermometer and heating device 1. No. 15g zwitterionic monomer (1), start the stirrer until all the monomers are dissolved. Then add NaOH to adjust the pH to 6.0, then pass nitrogen to drive oxygen, and heat after passing nitrogen. When the temperature rises to 45°C, add 0.26g ammonium persulfate, add 0.095g sodium bisulfite, and continue to pass nitrogen for half an hour. Then stop feeding nitrogen.

[0032] The reaction lasted for 4 hours, and the stirring speed was fixed at 300 rpm. After 4 hours, the semi-solid polymer was poured into an ethanol solution for purification, cut into pieces and granulated, and then dried in an oven at 50°C.

Embodiment 2

[0034] In this example, to a four-necked flask equipped with a stirrer, a reflux condenser thermometer and a heating device, 489g of water, 60g of acrylamide, 58g of 2-acrylamido-2 methylpropanesulfonic acid, 15g of N-ethylene Base pyrrolidone, No. 30g zwitterionic monomer (2), start the stirrer, until all monomers are dissolved. Then add NaOH to adjust the pH to 7.0, then pass nitrogen to drive oxygen, and heat after passing nitrogen. When the temperature rises to 50°C, add 0.815g ammonium persulfate, add 0.340g sodium bisulfite, and continue to pass nitrogen for half an hour. stop after.

[0035] The reaction lasted for 8 hours, and the stirring speed was fixed at 400rpm. After 8 hours, the semi-solid polymer was poured into the ethanol solution for purification, cut into pieces and granulated, and then dried in an oven at 65°C. After drying, the white particles were obtained. Filtrate reducer.

Embodiment 3

[0037] In this example, 306g of water, 40g of acrylamide, 58.3g of 2-acrylamido-2 methylpropanesulfonic acid, 15.6g of N - Vinylpyrrolidone, No. 37.47g zwitterionic monomer (3), start the stirrer until all the monomers are dissolved. Then add NaOH to adjust the pH to 11, then pass nitrogen to drive oxygen, heat after passing nitrogen, wait for the temperature to rise to 65°C, add 1.36g ammonium persulfate, add 0.663g sodium bisulfite, continue to pass nitrogen, half an hour stop after.

[0038] The reaction lasted for 10 hours, and the stirring speed was fixed at 600rpm. After 10 hours, the semi-solid polymer was poured into the ethanol solution for purification, cut into pieces and granulated, and then dried in an oven at 80°C. After drying, the white particles were obtained. Filtrate reducer.

[0039] (2) Performance test experiment

[0040] In this example, the fluid loss control agents prepared in Examples 1-3 were used for experiments.

[0041] Configuration of fresh ...

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Abstract

The invention provides a temperature-resistant and salt-resistant water-based drilling fluid filtrate reducer and a preparation method thereof, and relates to the technical field of oilfield chemistry, the filtrate reducer is generated by copolymerization of raw materials including acrylamide, N-vinyl pyrrolidone, 2-acrylamide-dimethyl propanesulfonic acid and zwitterionic monomers under the action of an initiator, and the amphoteric ionic monomer is one or more selected from N, N-dimethyl-N-(3-sulfopropyl)-4-vinyl benzyl ammonium inner salt, N, N-diethyl-N-(3-sulfopropyl)-4-vinyl benzyl ammonium inner salt, N, N-dimethyl-N-(3-sulfobutyl)-4-vinyl benzyl ammonium inner salt, and N, N-diethyl-N-(3-sulfobutyl)-4-vinyl benzyl ammonium inner salt. The zwitterionic monomer in the fluid loss agent contains quaternary ammonium cations and sulfonic acid groups which are equal in number, and further contains rigid group benzene rings, so that the fluid loss agent is good in temperature resistance and salt resistance, the temperature resistance reaches 230 DEG C, and the salt resistance reaches 36% of saturated sodium chloride.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a fluid loss reducer for temperature-resistant and salt-water-resistant base drilling fluid and a preparation method thereof. Background technique [0002] With the lack of oil resources, the current drilling work is mainly deep well and ultra-deep well drilling. During the drilling work, we often face the harsh environment of high temperature and high salt, which seriously damages the performance of drilling fluid. High temperature and high salt lead to degradation and dehydration of the polymer treatment agent, which seriously affects the rheological properties of the drilling fluid, makes the wall-building property of the drilling fluid worse, increases the filtration loss, increases the difficulty of drilling, and increases the drilling engineering cost. Security Risk. Filtrate reducer is a treatment agent that can be applied in the oil field drilling process and ...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/035C08F220/56C08F220/58C08F226/10C08F212/14
CPCC09K8/24C09K8/035C08F220/56C08F220/585C08F226/10C08F212/30
Inventor 林凌罗云翔刘洪吉余文可李鑫古晗
Owner SOUTHWEST PETROLEUM UNIV
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