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.
