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A kind of low molecular weight polymer shale inhibitor and preparation method thereof

A shale inhibitor, low molecular weight technology, applied in drilling compositions, chemical instruments and methods, earthwork drilling, etc. Easy-to-control effects

Active Publication Date: 2021-02-09
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-molecular-weight polymers can be coated on the clay surface to inhibit shale hydration and dispersion, but too high a molecular weight will affect the rheology of the drilling fluid system and should not be used in high-temperature and high-density conditions

Method used

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  • A kind of low molecular weight polymer shale inhibitor and preparation method thereof
  • A kind of low molecular weight polymer shale inhibitor and preparation method thereof
  • A kind of low molecular weight polymer shale inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Accurately control the total monomer concentration of 30wt%, weigh 0.4g sodium allyl sulfonate (AS) dissolved in deionized water and place it in a three-necked flask, pass nitrogen and oxygen for 10min; add 0.4g trihydroxyethylene Propyl ammonium bromide (THAAB), dropwise add 0.2g methyl methacrylate (MMA) and 0.05g chain transfer agent and seal immediately; quickly sprinkle 0.01g of K 2 S 2 o 8 and NaHSO 3 and sealed. After the mixed solution was polymerized at 40° C. for 4 hours, a viscous product was obtained. The product was fully washed with absolute ethanol, poured, filtered or evaporated to remove the ethanol and placed in a vacuum oven for a certain period of time to obtain 0.94 g of low molecular weight polymer shale inhibitor AS / THAAB / MMA. The number average molecular weight Mn was 18932, and the weight average molecular weight Mw was 21369.

Embodiment 2

[0025] Accurately control the total monomer concentration of 40wt%, weigh 0.30g sodium allyl sulfonate (AS) dissolved in deionized water and place it in a three-necked flask, pass nitrogen and oxygen for 10min; add 0.45g trihydroxyethylene Propyl ammonium bromide (THAAB), dropwise add 0.25g methyl methacrylate (MMA) and 0.05g chain transfer agent and seal immediately; quickly sprinkle 0.01g of K 2 S 2 o 8 and NaHSO 3 and sealed. After the mixed solution was polymerized at 50° C. for 5 hours, a viscous product was obtained. The product was fully washed with absolute ethanol, poured, filtered or evaporated to remove the ethanol and placed in a vacuum oven for a certain period of time to obtain 0.91 g of low molecular weight polymer shale inhibitor AS / THAAB / MMA. The number average molecular weight Mn was 18736, and the weight average molecular weight Mw was 21126.

Embodiment 3

[0027] Accurately control the total monomer concentration of 50wt%, weigh 0.20g sodium allyl sulfonate (AS) dissolved in deionized water and place it in a three-necked flask, pass nitrogen and oxygen for 10min; add 0.50g trihydroxyethylene Propyl ammonium bromide (THAAB), dropwise add 0.30g methyl methacrylate (MMA) and 0.04g chain transfer agent and seal immediately; quickly sprinkle 0.01g of K 2 S 2 o 8 and NaHSO 3 and sealed. After the mixed solution was polymerized at 70° C. for 5 hours, a viscous product was obtained. The product was fully washed with absolute ethanol, poured, filtered or evaporated to remove the ethanol and placed in a vacuum oven for a certain period of time to obtain 0.89 g of low molecular weight polymer shale inhibitor AS / THAAB / MMA. The number average molecular weight Mn was 19561, and the weight average molecular weight Mw was 12963.

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Abstract

The invention relates to a low molecular weight polymer shale inhibitor and a preparation method thereof. The method comprises: accurately controlling the total monomer concentration, weighing a certain amount of sodium allyl sulfonate dissolved in deionized water, adding trihydroxyethyl allyl ammonium bromide, dropping methyl methacrylate and Chain transfer agent; quickly sprinkle in equal mass of K 2 S 2 o 8 and NaHSO 3 And sealed, the mixed solution undergoes polymerization reaction, washed, sheared, granulated and dried to obtain the product. The product has strong thermal stability, has little influence on the rheology of the drilling fluid system, and has cheap and easy-to-obtain raw materials for preparation, and can be directly used in industrial production and on-site drilling applications.

Description

technical field [0001] The invention relates to a low-molecular-weight polymer shale inhibitor AS / THAAB / MMA and a preparation method thereof, in particular to a low-molecular-weight polymer shale inhibitor AS / THAAB for high-temperature, high-pressure, high-density water-based drilling fluid / MMA and its preparation method. Background technique [0002] During oil and gas drilling, when drilling into shale formations, the hydration expansion and dispersion of shale will lead to a series of problems such as wellbore instability, bit balling and borehole purification difficulties. Wellbore stability is a very complex worldwide problem often encountered in oil and gas drilling engineering. According to the statistics. The world oil industry spends as much as US$700 million on handling wellbore stability accidents every year. In order to solve these problems, oilfield researchers have developed oil-based and water-based drilling fluid systems in recent years, but oil-based dri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F226/02C08F220/14C08F228/02E21B21/00
Inventor 都伟超陈刚张洁
Owner XI'AN PETROLEUM UNIVERSITY