In 2013, Shunnan 4 and Shunnan 5 wells, which were deployed in Shunnan area, Tazhong North Slope, Tarim Basin, made a major breakthrough, so new requirements were put forward for the gas reservoir development level of Northwest Oilfield Branch Company. Based on the Yakera gas field, the previous research on gas test technology has focused on the productivity calculation of clastic reservoir and the understanding of reservoir zonation caused by reverse condensate phenomenon, In this project, the gas test design of carbonate gas reservoir is deeply studied, and a set of gas test design methods for fracture-hole type are formed, including the production prediction method of fracture-hole dry gas reservoir, the optimization design of gas test production system and the optimization design of surface process.
Study on production prediction method of fracture-hole dry gas reservoir: research on wellhead pressure conversion method. Production estimation when there is no measurement in a well. Estimation of absolute open flow capacity. Calculation of production pressure difference.
Study on optimal design of gas test production system: minimum critical liquid carrying output prediction. Calculation of maximum erosion yield. Work system (nozzle) design.
Ground process optimization design: research on temperature calculation method after throttling. Hydrate prediction method. Research on back pressure control technology to prevent hydrate formation.
Application of gas test design technology in carbonate reservoir.
At present, there is no in-depth study on the gas test design method of carbonate gas reservoir domestic and abroad. The research results and technical policies of the project are suitable for the whole carbonate fracture-hole reservoir. According to the geological characteristics and reservoir characteristics of carbonate gas reservoir, the factors restricting gas well production are found out, the gas recovery technology mode and recovery factor are optimized, and the matching drilling, well completion, production increase method, working system and gas production scheme are of great guiding significance for gas well productivity prediction and production guarantee. The product realizes the one-key operation of gas well working system design, provides the basis for gas test design, forms the leading technology to improve oil recovery, and realizes the efficient development of reservoir, which has high popularization value.