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Shale plugging inhibitor for shale gas horizontal well drilling and preparation method thereof

A technology for horizontal wells and inhibitors, which is applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc. It can solve the problem that the rheological properties of high molecular weight polymers are greatly affected, and the temperature resistance of treatment agents needs to be improved. The problems such as the inability of the agent to be effectively blocked, etc., to achieve the effects of easy control, mild reaction conditions, and good thermal stability

Active Publication Date: 2021-01-19
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

[0004] The purpose of the present invention is to overcome the poor performance of the existing plugging inhibitors, the temperature resistance of the treatment agent needs to be improved, the high molecular weight polymer has a great influence on the rheological properties of the drilling fluid system, and the treatment agent cannot effectively seal the micro-nano micro-fractures of the formation, etc. Disadvantages, providing a shale plugging inhibitor for shale gas horizontal well drilling and its preparation method

Method used

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  • Shale plugging inhibitor for shale gas horizontal well drilling and preparation method thereof
  • Shale plugging inhibitor for shale gas horizontal well drilling and preparation method thereof
  • Shale plugging inhibitor for shale gas horizontal well drilling and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] S1. Synthesis of new low molecular weight polymer AMPS / THAAB / MMA: Accurately control the total monomer concentration of 45wt%, weigh 0.1g of AMPS dissolved in deionized water and place it in a three-necked flask, pass nitrogen and oxygen for 10 minutes; add in sequence 0.2g THAAB, drop 0.7g MMA and 0.015g chain transfer agent and seal immediately; quickly sprinkle 0.025g of K 2 S 2 o 8 and NaHSO 3 and sealed. After the mixed solution was polymerized at 70° C. for 1 hour, a viscous product was obtained. After the product was fully washed with absolute ethanol and sheared and granulated, it was placed in a vacuum oven for a certain period of time to obtain 0.94 g of new low molecular weight AMPS / THAAB / MMA, with a number average molecular weight Mn of 34152 and a weight average molecular weight Mw of 42153.

[0031] S2. A preparation of shale plugging inhibitor for shale gas horizontal well drilling: the shale inhibitor is composed of novel low molecular weight AMPS / TH...

Embodiment 2

[0033] S1. Synthesis of new low-molecular-weight polymer AMPS / THAAB / MMA: Accurately control the total monomer concentration of 45wt%, weigh 0.2g of AMPS dissolved in deionized water and place it in a three-necked flask, pass nitrogen and oxygen for 10 minutes; add in sequence 0.3g THAAB, drop 0.5g MMA and 0.025g chain transfer agent and seal immediately; quickly sprinkle 0.030g of K 2S 2 o 8 and NaHSO 3 and sealed. After the mixed solution was polymerized at 80° C. for 1.5 hours, a viscous product was obtained. After the product was fully washed with absolute ethanol and sheared and granulated, it was placed in a vacuum oven for a certain period of time to obtain 0.96 g of new low molecular weight AMPS / THAAB / MMA, with a number average molecular weight Mn of 34695 and a weight average molecular weight Mw of 41668.

[0034] S2. A preparation of shale plugging inhibitor for shale gas horizontal well drilling: the shale inhibitor is composed of novel low molecular weight AMPS / ...

Embodiment 3

[0036] S1. Synthesis of new low-molecular-weight polymer AMPS / THAAB / MMA: Accurately control the total monomer concentration of 45wt%, weigh 0.25g of AMPS dissolved in deionized water and place it in a three-necked flask, pass nitrogen and oxygen for 10min; 0.35g THAAB, drop 0.4g MMA and 0.030g chain transfer agent and seal immediately; quickly sprinkle 0.035g K 2 S 2 o 8 and NaHSO 3 and sealed. After the mixed solution was polymerized at 90° C. for 1.5 hours, a viscous product was obtained. After the product was fully washed with absolute ethanol and sheared and granulated, it was placed in a vacuum oven for a certain period of time to obtain 0.93 g of new low molecular weight AMPS / THAAB / MMA, with a number average molecular weight Mn of 35698 and a weight average molecular weight Mw of 41726.

[0037] S2. A preparation of shale plugging inhibitor for shale gas horizontal well drilling: the shale inhibitor is composed of novel low molecular weight AMPS / THAAB / MMA, oil phase ...

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Abstract

The invention relates to a shale plugging inhibitor for drilling of a shale gas horizontal well and a preparation method thereof. The inhibitor is a mixture obtained by mixing novel low-molecular-weight polymer AMPS / THAAB / MMA, oil and water according to a certain ratio. The preparation method of the low-molecular-weight polymer AMPS / THAAB / MMA comprises the following steps: adding trihydroxyethyl allyl ammonium bromide, methyl methacrylate and chain transfer agent isopropyl alcohol into 2-acrylamide-2-methylpropanesulfonic acid, and adding K2S2O8 and NaHSO3 to carry out polymerization reactionto obtain a product. The inhibitor can achieve the aims of simultaneously inhibiting hydration expansion and dispersion of shale, has a good shale blocking inhibition effect and can be directly applied to shale gas development drilling.

Description

technical field [0001] The invention relates to a shale plugging inhibitor for shale gas horizontal well drilling and a preparation method thereof. In particular, it is a shale plugging inhibitor for water-based drilling fluid used in problem formations such as wellbore instability and collapse caused by shale hydration expansion during the drilling of shale gas horizontal wells. Background technique [0002] With the advent of the shale gas revolution, the development of shale gas has attracted more and more attention from the petroleum industry. In the process of shale gas drilling, the hydration expansion and dispersion of shale will lead to a series of problems such as wellbore instability, bit bagging and wellbore purification difficulties. Wellbore stability is a very complicated 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/508C09K8/88E21B33/13
Inventor 都伟超陈刚张洁
Owner 滨州市立德石油科技有限公司
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