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Temperature-resistant and salt-tolerant polymeric filtrate loss reducer for water-based drilling fluid and method for preparing temperature-resistant and salt-tolerant polymeric filtrate loss reducer

A quaternary copolymer and initiator technology, which is applied in the field of zwitterionic polymer fluid loss reducer and its preparation, can solve the problems of aggravated molecular thermal motion, aggravated failure of fluid loss reducer, high viscosity of drilling fluid, etc.

Inactive Publication Date: 2016-10-26
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the drilling fluid is in a high-temperature environment for a long time, the molecular structure of the fluid loss control agent is prone to thermal degradation and loses the properties of a polymer, and its molecular thermal movement is intensified due to heating, and the probability of desorption increases, resulting in the failure of the fluid loss control agent , and the intrusion of salt and calcium will further aggravate the failure of fluid loss control agent
[0004] Most of the polymer fluid loss control agents currently used in the field in our country increase the dosage and compound with other treatment agents to meet the technical requirements of the system for temperature resistance and salt resistance, which leads to high costs and excessive viscosity of drilling fluid. and other defects

Method used

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  • Temperature-resistant and salt-tolerant polymeric filtrate loss reducer for water-based drilling fluid and method for preparing temperature-resistant and salt-tolerant polymeric filtrate loss reducer
  • Temperature-resistant and salt-tolerant polymeric filtrate loss reducer for water-based drilling fluid and method for preparing temperature-resistant and salt-tolerant polymeric filtrate loss reducer
  • Temperature-resistant and salt-tolerant polymeric filtrate loss reducer for water-based drilling fluid and method for preparing temperature-resistant and salt-tolerant polymeric filtrate loss reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Preparation of fluid loss reducer PTS-1

[0034] Dissolve 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in deionized water, neutralize the solution to pH=7~8 with NaOH, and N,N-dimethylacrylamide (DMAA), Trihydroxyethylallyl ammonium chloride (TAAC) and N-vinylpyrrolidone (NVP) are mixed with the neutralized solution, and then added to a three-necked flask with a thermometer and a reflux device, stirred, nitrogen and oxygen exhausted. Gradually raise the temperature to 50°C, add 0.3% initiator ammonium persulfate-sodium bisulfite after passing nitrogen for 30 minutes, and the total monomer concentration is 20%, after reacting for 7 hours, wash the white gel-like product with absolute ethanol Fully wash, separate the precipitate, dry and pulverize at high temperature to obtain the fluid loss reducer PTS-1, and obtain the target product with a yield of 90.8%. The reaction formula is as follows:

[0035]

[0036] Structural characterization of fluid lo...

Embodiment 2

[0040] Embodiment 2: Preparation of fluid loss reducer PTS-2

[0041] Dissolve 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in deionized water, neutralize the solution to pH=7~8 with NaOH, and N,N-dimethylacrylamide (DMAA), Methyldihydroxyethylallyl ammonium chloride (TMAC) and N-vinylpyrrolidone (NVP) are mixed with the neutralized solution, and then added to a three-necked flask with a thermometer and a reflux device, stirred, nitrogen and oxygen exhausted . Gradually raise the temperature to 50°C, add 0.3% initiator ammonium persulfate-sodium bisulfite after passing nitrogen for 30 minutes, and the total monomer concentration is 20%, after reacting for 7 hours, wash the white gel-like product with absolute ethanol Fully wash, separate the precipitate, dry and pulverize at high temperature to obtain the fluid loss reducer PTS-2, and obtain the target product with a yield of 91.4%. The reaction formula is as follows:

[0042]

Embodiment 3

[0043] Embodiment 3: Preparation of fluid loss reducer PTS-3

[0044]Dissolve 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in deionized water, neutralize the solution to pH=7~8 with NaOH, and N,N-dimethylacrylamide (DMAA), Ethyl dihydroxyethyl allyl ammonium chloride (TEAC) and N-vinylpyrrolidone (NVP) are mixed with the neutralized solution, and then added to a three-necked flask with a thermometer and reflux device, stirred, nitrogen and oxygen exhausted . Gradually raise the temperature to 50°C, add 0.3% initiator ammonium persulfate-sodium bisulfite after passing nitrogen for 30 minutes, and the total monomer concentration is 20%, after reacting for 7 hours, wash the white gel-like product with absolute ethanol Fully wash, separate the precipitate, dry and pulverize at high temperature to obtain the fluid loss reducer PTS-3, and obtain the target product with a yield of 91.2%. The reaction formula is as follows:

[0045]

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Abstract

The invention relates to a temperature-resistant and salt-tolerant polymeric filtrate loss reducer for water-based drilling fluid and a method for preparing the temperature-resistant and salt-tolerant polymeric filtrate loss reducer. The method includes copolymerizing monomers of alkenyl amide, alkenyl propanesulfonic acid, alkenyl ammonium chloride and vinyl pyrrolidone by the aid of free radical solution polymerization processes according to certain proportions to obtain the temperature-resistant and salt-tolerant polymeric filtrate loss reducer. The relative molecular mass of copolymers is 100-300 thousands. The temperature-resistant and salt-tolerant polymeric filtrate loss reducer and the method have the advantages that the temperature-resistant and salt-tolerant polymeric filtrate loss reducer is high in temperature resistance (the temperature-resistant and salt-tolerant polymeric filtrate loss reducer can resist temperatures of 220 DEG C) and is still excellent in filtrate loss reducing performance in high-salinity environments, and basic mud systems are good in rheological property after the temperature-resistant and salt-tolerant polymeric filtrate loss reducer is added into the basic mud systems; high-temperature thickening can be prevented, accordingly, requirements of current deep drilling operation can be met, the method is simple and is high in yield, and conditions are mild.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant fluid loss reducer for water-based drilling fluids suitable for deep formations during petroleum drilling and a preparation method thereof, in particular to a zwitterionic polymer fluid loss reducer and a preparation method thereof. Background technique [0002] With the strengthening of the exploration and development of oil and gas resources in deep formations, the drilling depth continues to increase, the bottom hole temperature continues to rise, and the probability of drilling high salt and calcium formations is also increasing, as a key treatment agent for water-based drilling fluid systems High-quality fluid loss control agents are often faced with the severe test of high temperature and salt calcium intrusion at the same time, and the development of fluid loss control agents with both temperature and salt resistance has become an urgent task in the field of oilfield chemistry re...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F220/54C08F226/02C08F226/10C08F220/56C09K8/035
CPCC08F220/58C08F220/585C09K8/035C08F220/54C08F226/02C08F226/10C08F220/56
Inventor 罗霄都伟超蒲晓林王贵
Owner SOUTHWEST PETROLEUM UNIV
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