The stimulation of offshore tight sandstone gas reservoirs is influenced by several factors. In order to promote the efficient development of offshore tight sandstone gas reservoirs

volumetric acid fracturing technology of offshore tight sandstone gas reservoirs is studied. And then

considering 3 problems of acid fracturing in sandstone reservoirs

6 requirements for geology and engineering are put forward. Based on the analysis of reservoir lithological characteristics

brittleness index

stress characteristics and natural fracture development of the offshore gas field

the geological and engineering conditions of sandstone reservoir volume acid pressure are summarized. Aiming at the problems of abnormal high temperature

high breakdown pressure

water lock damage and serious water sensitivity damage

an acid liquid system is developed. The formula was 8 %HCl+5 %SA702+60 %NaBr+1 %WD-12+5 %SA601+1.5 %HJF+10 %ethanol+1 %SA1-1+1 %WD-5B+1.5 %SA1-7. Acid pretreatment can effectively reduce reservoir fracture pressure

and 9.5 MPa is reduced when applied. Volume acid fracturing is reformed by the interlayer temporary plugging steering technology using 1.5 % fibre with the length of 6 mm+0.8 % small particle+1.2 % large particle. The single well increased production ratio was 7.1

and the yield increasing effect was remarkable. This technology can provide theoretical basis and technical support for the development of tight sandstone gas reservoirs.