Water controlling and acid fracturing method suitable for carbonate reservoir

The invention provides a water controlling and acid fracturing method suitable for a carbonate reservoir. The method includes the steps that sliminess water prepad fluid is injected into stratum at the displacement of 1.0 m /min-3.0 m /min; the displacement is increased to 3.5 m /min-4.5 m /min, and...

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Main Authors WANG LEI, ZHANG YE, YANG FANGZHENG, AN NA, HU WENTING, MI QIANGBO, LI YONGSHOU, HUANG YANFEI, YANG YUQIN, SONG ZHIFENG, ZHANG XIONG, GENG YUDI, GUAN HAIJIE, LI NAN, ZHAO BING, LUO PANDENG
Format Patent
LanguageEnglish
Published 30.09.2015
Subjects
ADHESIVES
CHEMISTRY
DYES
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MINING
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
PAINTS
POLISHES
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Summary:The invention provides a water controlling and acid fracturing method suitable for a carbonate reservoir. The method includes the steps that sliminess water prepad fluid is injected into stratum at the displacement of 1.0 m /min-3.0 m /min; the displacement is increased to 3.5 m /min-4.5 m /min, and gelled fracturing fluid is injected to the stratum; the gelled sand-carrying fluid is injected into the stratum at the displacement of 3.5 m /min-4.5 m /min, and meanwhile precoated sand with the mesh being 70 to 140 is injected into the stratum according to the sand ratio of 4%-6%; the gelled fracturing fluid or the sliminess water prepad fluid is injected into the stratum at the displacement of 3.5 m /min-4.5 m /min; gelled acid is injected into the stratum at the displacement of 3.5 m /min-4.5 m /min, when the injection volume is the sum of the volume of an oil pipe and the volume of a shaft on the lower portion of the oil pipe, the displacement is increased to 5.0 m /min-6.0 m /min, and gelled acid is injected continuously; replacement liquid is injected into the stratum at the displacement of 4.0 m /min-5.0 m /min. By means of the water controlling and acid fracturing method, extension of the downward fracture is controlled effectively, the water cut rising speed is lowered, and water control and oil production enhancing of the carbonate reservoir are achieved.
Bibliography:Application Number: CN20151347269