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The Conversion of Non-Dispersed Polymers into Low-Potassium Anti-Collapse Drilling Fluids

Fluid Dynamics & Materials Processing 2024年第2期20卷 325-335页

作者： Hao Hu Jian Guan Shanfa Tang Jialuo Rong Yuanpeng Cheng School of Petroleum Engineering Yangzte UniversityWuhan430100China Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering Yangtze UniversityWuhan430100China School of Petroleum Engineering Yangtze UniversityNational Engineering Research Center for Oil&Gas Drilling and Completion TechnologyWuhan430100China Engineering Technology Research Institute of PetroChina Great Wall Drilling Engineering Co. Ltd.Panjin124000China

Different drillingﬂuid systems are designed according to mineral composition,lithology and wellbore stability of different *** the present study,the conversion of a non-dispersed polymer drillingﬂuid into a low potas-sium anti-collapsing drillingﬂuid is *** the two drillingﬂuids belong to completely different types,the key to this conversion is represented by new inhibitors,dispersants and water-loss agents by which a non-dispersed drillingﬂuid can be turned into a dispersed drillingﬂuid while ensuring wellbore stability and reason-able rheology(carrying sand—inhibiting cuttings dispersion).In particular,the(QYZ-1)inhibitors and(FSJSS-2)dispersants are *** former can inhibit the hydration expansion capacity of clay,reduce the dynamic shear force and weaken the viscosity;the latter can improve the sealing effect and reduce theﬁltrate *** results have shown that after adding a reasonable proportion of these substances(QYZ-1:FSJSS-2)to the non-dispersed polymer drillingﬂuid,while the apparent viscosity,plastic viscosity,structural viscosity andﬂuidity index under-went almost negligible changes,the dynamic plastic ratio increased,and theﬁltration loss decreased signiﬁcantly,thereby indicating good *** to the tests(conducted in the Leijia area),the density was 1.293 g/cm3,and after standing for 24 h,the SF(static settlement factor)was ***,theﬁltration loss was reduced to 4.0 mL,the rolling recovery rate reached 96.92%,with excellent plugging and anti-collapse performances.

关键词： Non-dispersed polymer drilling fluid low potassium anti-collapsing drilling fluid drilling fluid conversion drilling fluid reuse filter vector

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