In complex strata, oil-based drilling fluid is the preferred drilling fluid system, but its preparation cost is high, and there are hidden safety risks. Therefore, the new progress of high-performance anti-collapse wa...In complex strata, oil-based drilling fluid is the preferred drilling fluid system, but its preparation cost is high, and there are hidden safety risks. Therefore, the new progress of high-performance anti-collapse water-based drilling fluid at home and abroad is analyzed. It is difficult to prevent and control the well collapse. Once the well wall instability problem occurs, it will often bring huge economic losses to the enterprises, and the underground safety accidents will occur. In order to ensure the stability of the well wall and improve the downhole safety, the key treatment agent of water-based collapse drilling fluid is selected, the anti-collapse drilling fluid system is formulated, the evaluation method of drilling fluid prevention performance is established, and a set of water-based drilling fluid system suitable for easy to collapse strata in China is selected to ensure the downhole safety. The development trend of high performance anti-collapse water-based drilling fluid is expected to provide a reference for the research of high performance anti-collapse water-based drilling fluid system and key treatment agent.展开更多
Seeking effective solutions to control and mitigate the interaction between drilling fluids and clay formations has been a challenge for many years, and various shale inhibitors have shown excellent results in problem...Seeking effective solutions to control and mitigate the interaction between drilling fluids and clay formations has been a challenge for many years, and various shale inhibitors have shown excellent results in problematic shale formations around the world. Herein, the hyperbranched polyamine (HBPA) inhibitor with a higher ratio of amine groups and obvious tendentiousness in protonation was successfully synthesized from ethylenediamine, acryloyl chloride and aziridine by five steps, in which the metal-organic framework (MOF) was employed as a catalyst for ring-open polycondensation (ROP). The structure and purity were confirmed by nuclear magnetic resonance hydrogen spectroscopy and high-performance liquid chromatography (HPLC) respectively. The HBPA displays more excellent performance than EDA and KCl widely applied in the oil field. After aging at 80°C and 180°C, the YP of a slurry system containing 25 wt.% bentonite and 2 wt.% HBPA are just 8.5 Pa and 5.5 Pa (wt.%: percentage of mass), respectively. The swelling lengths of 2 wt.% HBPA are estimated to be 1.78 mm, which falls by 70% compared with that of freshwater. Under a hot rolling aging temperature of 180°C, the HBPA system demonstrates a significant inhibition with more than 85% shale cuttings recovery rate and is superior to conventional EDA and KCl. Mechanism analysis further validates that the HBPA can help to increase the zeta potential.展开更多
近年来,随着石油勘探向大位移井、深井、超深水井等方向发展,高温储层段对钻井液处理剂的要求也越来越高。增黏剂作为控制无土相水基钻井液黏度和提高钻井液携岩能力的关键材料,其抗温能力也面临着更高的挑战。以2-丙烯酰胺-2-甲基丙磺...近年来,随着石油勘探向大位移井、深井、超深水井等方向发展,高温储层段对钻井液处理剂的要求也越来越高。增黏剂作为控制无土相水基钻井液黏度和提高钻井液携岩能力的关键材料,其抗温能力也面临着更高的挑战。以2-丙烯酰胺-2-甲基丙磺酸AMPS、烯基己内酰胺NVCL、N-乙烯基吡咯烷酮NVP、二乙烯苯DVB这4种合成单体为原料,以油溶性偶氮类为引发剂,通过胶束聚合反应,研制了一种水基抗温增黏剂,并评价了其各项性能,结果表明:该抗温增黏剂于160℃老化后,0.9%样品溶液的表观黏度为34 m Pa·s,动塑比达0.55,具有良好的增黏提切效果。该剂抗温达180℃,在高温下的增黏效果优于常规增黏剂,抗盐达饱和,抗钙达1.5%,很好地满足了钻井过程中对高温高盐地层钻井液增黏提切的要求。展开更多
文摘In complex strata, oil-based drilling fluid is the preferred drilling fluid system, but its preparation cost is high, and there are hidden safety risks. Therefore, the new progress of high-performance anti-collapse water-based drilling fluid at home and abroad is analyzed. It is difficult to prevent and control the well collapse. Once the well wall instability problem occurs, it will often bring huge economic losses to the enterprises, and the underground safety accidents will occur. In order to ensure the stability of the well wall and improve the downhole safety, the key treatment agent of water-based collapse drilling fluid is selected, the anti-collapse drilling fluid system is formulated, the evaluation method of drilling fluid prevention performance is established, and a set of water-based drilling fluid system suitable for easy to collapse strata in China is selected to ensure the downhole safety. The development trend of high performance anti-collapse water-based drilling fluid is expected to provide a reference for the research of high performance anti-collapse water-based drilling fluid system and key treatment agent.
文摘Seeking effective solutions to control and mitigate the interaction between drilling fluids and clay formations has been a challenge for many years, and various shale inhibitors have shown excellent results in problematic shale formations around the world. Herein, the hyperbranched polyamine (HBPA) inhibitor with a higher ratio of amine groups and obvious tendentiousness in protonation was successfully synthesized from ethylenediamine, acryloyl chloride and aziridine by five steps, in which the metal-organic framework (MOF) was employed as a catalyst for ring-open polycondensation (ROP). The structure and purity were confirmed by nuclear magnetic resonance hydrogen spectroscopy and high-performance liquid chromatography (HPLC) respectively. The HBPA displays more excellent performance than EDA and KCl widely applied in the oil field. After aging at 80°C and 180°C, the YP of a slurry system containing 25 wt.% bentonite and 2 wt.% HBPA are just 8.5 Pa and 5.5 Pa (wt.%: percentage of mass), respectively. The swelling lengths of 2 wt.% HBPA are estimated to be 1.78 mm, which falls by 70% compared with that of freshwater. Under a hot rolling aging temperature of 180°C, the HBPA system demonstrates a significant inhibition with more than 85% shale cuttings recovery rate and is superior to conventional EDA and KCl. Mechanism analysis further validates that the HBPA can help to increase the zeta potential.
文摘近年来,随着石油勘探向大位移井、深井、超深水井等方向发展,高温储层段对钻井液处理剂的要求也越来越高。增黏剂作为控制无土相水基钻井液黏度和提高钻井液携岩能力的关键材料,其抗温能力也面临着更高的挑战。以2-丙烯酰胺-2-甲基丙磺酸AMPS、烯基己内酰胺NVCL、N-乙烯基吡咯烷酮NVP、二乙烯苯DVB这4种合成单体为原料,以油溶性偶氮类为引发剂,通过胶束聚合反应,研制了一种水基抗温增黏剂,并评价了其各项性能,结果表明:该抗温增黏剂于160℃老化后,0.9%样品溶液的表观黏度为34 m Pa·s,动塑比达0.55,具有良好的增黏提切效果。该剂抗温达180℃,在高温下的增黏效果优于常规增黏剂,抗盐达饱和,抗钙达1.5%,很好地满足了钻井过程中对高温高盐地层钻井液增黏提切的要求。
