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- W2378074355 abstract "The types of formation damages in Daqingzijing area are described, i. e. , solids blocking damage because of the invasion of drill-in fluid solids into micro fractures or lost circulation; water blocking, water sensitivity and alkali sensitivity damages because of the invasion of drill-in fluid filtrate into formation; velocity damage because of the excessive water injection speed; inorganic scale damage of the invasion of high valency cationic drill-in fluid filtrate into formation. By evaluating the causes of formation damage, a set of drill-in fluid technologies is presented, consisting of the following aspects: 1. strengthening the inhibition of drill-in fluid filtrate and reducing its surface tension; 2. reducing the filtration of drilling fluid and completion fluid; 3. when batching the completion fluid, attention should be paid on its ions content and salinity, and the ions composition and salinity should be similar with that of the formation fluid; 4. adding solid fines of suitable granularity into the drill-in fluid, so as to form tense filtrate cake and reduce the filtration of the system, meanwhile plug the micro fractures in the low permeability formation; 5. controlling the pH value of the drill-in fluid at about 10, to minimize the degree of alkali sensitivity damage. This set of drilling fluid technologies has been field tested with good results obtained." @default.
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- W2378074355 date "2002-01-01" @default.
- W2378074355 modified "2023-09-26" @default.
- W2378074355 title "Formation damage mechanisms and protection technologies in Daqingzijing area" @default.
- W2378074355 hasPublicationYear "2002" @default.
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