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- W2386173198 abstract "Circulation losses often occur in drilling in deficient, low pressure pay layers of early exploited reservoirs in Liaohe oil fields. A foaming agent, sodium dodecyl benzene sulfonate, is chosen with dosage being of 0.4～1.0% and 4 polymers are arranged according to their foam stabilizing power in order XCPACHV-CMC80A51 with dosage being of 0.1—0.3%. Five foamed water base drilling fluids (FWBDFs) are formulated and prepared with the foaming agent and the foam stabilizer chosen and three of these have satisfactory rheologic and filtration behavior, density ranged 0.73—0.79 g/cm~3 and foam stabilization time 40 hrs; good properties and foaming power are maintained after rolling at 120℃ in 16 hrs; introducing 5% NaCl or 10% crude oil does not affect the viscosity/yield behavior of one of these FWBDFs significantly and foam stabilization time is 30 hrs; in screening/temporarily plugging/inverse flooding experiments with the FWBDFs the recovery of core permeability is as high as 90.8—95.2%; the density of the FWBDFs can be adjusted with the help of a defoamer, GY-100 or GM801, and, in extreme cases, an FWBDF can be converted to a water base low solid phase drilling fluid. In an adjustment well in reservoir Lengdong-99, Liaohe, where a loss of circulation occurred in pay layers while drilling performed with a water base fluid of low density 1.44 g/cm~3, and in a directional well in reservoir Jing-99, Liaohe, applying FWBDFs of density 0.65—0.85 g/cm~3 leads to successful completion of the drilling jobs without any circulation loss and with the oil/gas show detected in time; the productivity and the production rate of the two wells are higher than that of the neighbor wells." @default.
- W2386173198 created "2016-06-24" @default.
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- W2386173198 date "2004-01-01" @default.
- W2386173198 modified "2023-09-24" @default.
- W2386173198 title "Circulative Foamed Water Base Drilling Fluids and Their Uses for Controlling and Preventing Circulation Losses in Low Pressure Pay Layers" @default.
- W2386173198 hasPublicationYear "2004" @default.
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