发明名称 Method for measuring rock wettability
摘要 Abstract A method of assessing a change in the wettability of a porous and permeable hydrocarbon bearing formation in the region surrounding a new wellbore penetrating a hydrocarbon 5 bearing formation, the change being due, at least in part, to ingress of drilling mud into the formation, the method comprising: (i) locating a pre-existing wellbore penetrating the hydrocarbon-bearing formation or a similar formation; (ii) locating an NMR well logging tool within the pre-existing wellbore at a depth 10 corresponding with a portion of the hydrocarbon-bearing formation; (iii) measuring a relaxation time for the fluid located within the near wellbore region surrounding the pre-existing wellbore; (iv) drilling a new wellbore at a new location removed from the pre-existing wellbore, whereby the new wellbore intersects the hydrocarbon-bearing formation; 15 (v) locating an NMR well logging tool within the new wellbore at a depth corresponding with a portion of the hydrocarbon-bearing formation; (vi) measuring a relaxation time for the fluid located within the near wellbore region surrounding the new wellbore; and comparing the relaxation time measurements from steps (iii) and (vi) to assess the change 20 in the wettability of the fluid in the near wellbore region surrounding the new wellbore, the change being due, at least in part, to the ingress of drilling mud into the formation during drilling of the new wellbore. #156 1800 _ Imbibition 1600 -- SwI -a--Aged@Swi --- Bulk crude 1000 -~-0Sol 10 100 1000 10000 100000 1000000 T2 (us) FIG. 1-9 #157 1400 -- Swi -a--Aged 1200'~-- Bulk crude 0-800 10 100 1000 10000 100000 1000000 T2 (us) FIG. 1-10
申请公布号 AU2014208196(A1) 申请公布日期 2014.08.21
申请号 AU20140208196 申请日期 2014.07.29
申请人 BP EXPLORATION OPERATING COMPANY LIMITED 发明人 CHEN, QUAN;COLLINS, IAN RALPH
分类号 G01V3/32 主分类号 G01V3/32
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