Productivity evaluation of open-hole perforation completion based on finite element numerical simulation

With the continuous advancement of oil and gas exploration and development, unconventional oil and gas resources have been paid more and more attention. The production improvement is a key part of the well-test and development process, but conventional completion forms can no longer meet the oilfield’s production requirements. Therefore, in order to improve the well test productivity of tight glutenite reservoirs in Bohai Oilfield, based on the principles of reducing formation pollution and increasing the exposure area of the wellbore, a new completion form was proposed, namely open-hole perforation. Using the finite element theory, a three-dimensional model of productivity evaluation was established, and the production of different completion forms, such as open-hole perforation, open-hole and casing perforation, under specific working conditions were classified and evaluated. Afterwards, the sensitivity analysis of the parameters affecting the productivity of open-hole perforation completion was carried out. Finally, a two-dimensional planar model for perforated well was used to reveal the production improvement mechanism, and the indoor experimental results for productivity evaluation verified the laws obtained by numerical simulation. Studies have shown that the open-hole perforation completion can effectively increase the well test productivity, and the productivity improvement effect depends on the formation conditions and perforating parameter combination. Compared with the openhole completion, the rate of productivity improvement is about 40%~80%. Compared with the casing perforation completion, the rate of productivity improvement is about 10%~130%. This study provides a new idea for the selection of unconventional oil and gas well completion forms, which can provide basis and reference for the formulation of on-site production improvement plans.