Abstract: A method includes: capturing an imaging well log according to a research depth; processing imaging well log to acquire an area percentage of total content of gravel components; selecting a rock core sample, and obtaining area content percentages of various kinds of gravel-grade rock debris in a rock core section sample; obtaining final percentage content of each kind of gravel-grade rock debris according to area content percentages of various kinds of gravel-grade rock debris and the area percentage of the total content of the gravel components; acquiring content of various kinds of sand-grade rock debris in the rock core sample corresponding to research depth; and adding final percentage content of the various kinds of gravel-grade rock debris and the content of the same kinds of sand-grade rock debris so as to obtain actual content percentages of various kinds of rock debris at the research depth.

Abstract: The invention provides an acidizing solution for dissolution of a clay mineral and a preparation method thereof. The acidizing solution comprises hydrochloric acid, fluoboric acid, acetic acid, trifluoroacetic acid, hydrogen peroxide, ammonium chloride, dimethylamino-methylbenzotriazole, alkyl ammonium chloride, and polymethylacrylic acid. The acidizing solution provided by the invention can effectively dissolve organic matter, such as clay minerals and cements, in a high-temperature oil-gas reservoir over 160° C., inhibit swelling and migration of clay particles in the presence of water in the acidizing process, avoid secondary deposition of the reservoir, and improve the permeability of the reservoir. The acidizing solution can be prepared and used on the field conveniently and is safe and reliable.

Abstract: The invention provides an acidizing solution for dissolution of a clay mineral and a preparation method thereof. The acidizing solution comprises hydrochloric acid, fluoboric acid, acetic acid, trifluoroacetic acid, hydrogen peroxide, ammonium chloride, dimethylamino-methylbenzotriazole, alkyl ammonium chloride, and polymethylacrylic acid. The acidizing solution provided by the invention can effectively dissolve organic matter, such as clay minerals and cements, in a high-temperature oil-gas reservoir over 160° C., inhibit swelling and migration of clay particles in the presence of water in the acidizing process, avoid secondary deposition of the reservoir, and improve the permeability of the reservoir. The acidizing solution can be prepared and used on the field conveniently and is safe and reliable.