为降低降滤失剂对钻井液黏度的影响,采用丙烯酰胺、N-乙烯基吡咯烷酮、2-丙烯酰胺基-2-甲基丙磺酸、烯丙基聚乙二醇为主要单体,合成了聚合物降滤失剂GZ-1,用红外光谱对GZ-1的结构进行了表征,研究了GZ-1对钻井液流变性能和滤失性能的影响...为降低降滤失剂对钻井液黏度的影响,采用丙烯酰胺、N-乙烯基吡咯烷酮、2-丙烯酰胺基-2-甲基丙磺酸、烯丙基聚乙二醇为主要单体,合成了聚合物降滤失剂GZ-1,用红外光谱对GZ-1的结构进行了表征,研究了GZ-1对钻井液流变性能和滤失性能的影响,通过环境扫描电镜分析了GZ-1对钻井液滤饼微观形貌的影响。结果表明,合成的GZ-1含有设计的官能团,黏均分子量适中(22.9万),1.6%GZ-1水溶液的黏度仅为7 m Pa·s;随着GZ-1浓度增加,聚合物钻井液的滤失量逐渐降低,钻井液的表观黏度(AV)和塑性黏度(PV)小幅增加,基浆在加入1.6%GZ-1后的AV和PV增幅分别为1.7和1.5倍,180℃老化16 h后的增幅分别为1.1和2.7倍;加入重晶石提高聚合物钻井液密度时未出现黏度激增现象;GZ-1可使钻井液滤饼更为致密,有效抑制黏土颗粒的聚结作用。GZ-1可抗180℃高温,增黏作用小于常用降滤失剂JT888和SY-3,对钻井液黏度的影响较小。展开更多
Drill cuttings are broken bits of solid material removed from a borehole drilled by rotary,percussion,or auger methods and brought to the surface in the drilling mud.When these cuttings enter the annulus,they have an ...Drill cuttings are broken bits of solid material removed from a borehole drilled by rotary,percussion,or auger methods and brought to the surface in the drilling mud.When these cuttings enter the annulus,they have an effect on the drillingfluid rheology and density,which is,in general,quite difficult to evaluate.By introducing an empirical correlation for the rheological properties of cuttings-laden drillingfluids,this study proposes a pres-sure-loss prediction method for an extended-reach well(ERW).After verifying the accuracy of this method,a case study is considered and a sensitivity analysis is conducted assuming a yield-power lawfluid.The results show that an increased concentration of cuttings in the annulus contributes to an increased annular pressure loss.Com-pared to their effect on the drillingfluid density,cuttings have a greater impact on the drillingfluid rheology.A larger rate of penetration contributes to an increased annular pressure loss.For higher drillingfluidflow rates,the annular pressure lossfirst decreases and then it increases.In addition,the annular pressure loss becomes high-er as the cuttings’particle size decreases and the cuttings’concentration grows.展开更多
文摘为降低降滤失剂对钻井液黏度的影响,采用丙烯酰胺、N-乙烯基吡咯烷酮、2-丙烯酰胺基-2-甲基丙磺酸、烯丙基聚乙二醇为主要单体,合成了聚合物降滤失剂GZ-1,用红外光谱对GZ-1的结构进行了表征,研究了GZ-1对钻井液流变性能和滤失性能的影响,通过环境扫描电镜分析了GZ-1对钻井液滤饼微观形貌的影响。结果表明,合成的GZ-1含有设计的官能团,黏均分子量适中(22.9万),1.6%GZ-1水溶液的黏度仅为7 m Pa·s;随着GZ-1浓度增加,聚合物钻井液的滤失量逐渐降低,钻井液的表观黏度(AV)和塑性黏度(PV)小幅增加,基浆在加入1.6%GZ-1后的AV和PV增幅分别为1.7和1.5倍,180℃老化16 h后的增幅分别为1.1和2.7倍;加入重晶石提高聚合物钻井液密度时未出现黏度激增现象;GZ-1可使钻井液滤饼更为致密,有效抑制黏土颗粒的聚结作用。GZ-1可抗180℃高温,增黏作用小于常用降滤失剂JT888和SY-3,对钻井液黏度的影响较小。
基金supported by the Sinopec Scientific Research Project“Demonstration of Engineering Technology for Ultra-Deep Drilling and Completion in Tarim Basin”(No.P21081-6)the National Natural Science Foundation of China Project“Mesoscopic Simulation of Dynamic Behavior of Bridging Particles Forfractured Thief Zone”(No.51604237).
文摘Drill cuttings are broken bits of solid material removed from a borehole drilled by rotary,percussion,or auger methods and brought to the surface in the drilling mud.When these cuttings enter the annulus,they have an effect on the drillingfluid rheology and density,which is,in general,quite difficult to evaluate.By introducing an empirical correlation for the rheological properties of cuttings-laden drillingfluids,this study proposes a pres-sure-loss prediction method for an extended-reach well(ERW).After verifying the accuracy of this method,a case study is considered and a sensitivity analysis is conducted assuming a yield-power lawfluid.The results show that an increased concentration of cuttings in the annulus contributes to an increased annular pressure loss.Com-pared to their effect on the drillingfluid density,cuttings have a greater impact on the drillingfluid rheology.A larger rate of penetration contributes to an increased annular pressure loss.For higher drillingfluidflow rates,the annular pressure lossfirst decreases and then it increases.In addition,the annular pressure loss becomes high-er as the cuttings’particle size decreases and the cuttings’concentration grows.
