Tower 12 Of The Silurian Sandstone Acidizing Technology Research

Sandstone reservoir is distributed widely in our country. For being extremely complicated and easily damaged, sandstone reservoirs are often treated with acidzing. Acidizing treatments in TaZhong(TZ)12 Silurian sandstone formation had achieved little effect and should be improved for inadequate understanding on the damage and inappropriate acid system.Based on that, aiming at reservoir acidizing stimulation, this paper present a deep research on the geology characters of the TZ12 Silurian sandstone formation and analyze the damage situation combined with the production practice and test. The objectivity of existing different kinds of potential factors was proven. According to the characters of the TZ12 Silurian formation, a great lot of laboratory test was complemented through multiplicate traditional test technologies as well as new apparatus, which include corrosion test, acid additives selection and evaluation test, acid formulation effect evaluation test and core flow test. Finally the acid fluid system had been selected, which adapted to the TZ12 Silurian sandstone reservoirs. In consideration of temperature in well bore and formation, multicomponent mineral and formation damage, simultaneously, a new mathematical model and a numerical model of sandstone acidizing are developed in this paper to improve matrix acidizing design level, which reflected reaction mechanism more exactly in high temperature sandstone by considering the influence of the secondary reactions. On the base of that, a new numerical prediction model of production following sandstone acidizing is present and it consummate sandstone acidizing model system. The result of many calculations showed this program was reliable and thee result was reasonable.?According to some successful oilfield trying with acid fracturing in sandstone reservoir, the paper make a research on the acid fracturing technology in sandstone. Theory analyse are present about the influence factors on acid etching fracture conductivity after acidizing treatment. Mensurating the fracture conductivity and its influence factor in laboratory is the primary researching means. Acid fracturing in the TZ12 Silurian sandstone formation is investigated and validated by fracture conductivity test and the paper not only spread out acidizing stimulation technologies but also supervise the oilfield practice by acid fracturing.Based on the research in this paper, a suit of sandstone acidizing technology and techniques is presented for the TZ12 Silurian formation based on the understanding about formation geology and the damage factors. The research accomplishments of...