ABSTRACT
The evaluation of tight gas production capacity is very important for the gas well later production. The one-point method empirical formula for calculating the flow without resistance is widely used as a simple method for calculating the flow without resistance. The three types of production capacity well testing at present include back pressure well testing, isochronous well testing, and modified isochronous well testing, among which modified isochronous well testing is more suitable for tight sandstone gas reservoirs. In order to carry out the unobstructed flow of gas well in tight sandstone gas reservoir of Shenfu Block in Ordos Basin, two well correction isochronous tests were carried out. Based on the theoretical study, field test, and system analysis, the well test and interpretation method adapted to Shenfu Block was analyzed. The study shows that the additional pressure recovery test after the conventional modified equal-time well test can more accurately evaluate gas well capacity, and provide a reliable dynamic basis for gas field exploration and development.
