A shale oil horizontal well single well controlled geological reserve prediction method

Abstract

The invention discloses a shale oil horizontal well single well control geological reserve prediction method, which calculates the recovery rate of unsaturated shale oil reservoir depletion development life cycle according to the recovery calculation model of the full life cycle of shale oil depletion development , the full life cycle recovery model of shale oil depletion development is calculated as the sum of elastic flooding recovery and solution gas flooding recovery; the cumulative oil production of a single well is calculated; Calculate the controlled geological reserves of a single well based on the recovery factor of the life cycle and the cumulative oil production of a single well. Based on the principles of formation pressure change and material balance in shale oil reservoir depletion development, the present invention establishes a recovery prediction model for the full life cycle of shale oil depletion development, and at the same time predicts the cumulative production of a single well according to the production dynamics of horizontal wells in shale oil development. Oil volume, so as to realize the rapid and accurate prediction of the controlled reserves of a single well in a horizontal well.

Description

technical field [0001] The invention relates to the technical field of single well controlled reserves calculation in oil and gas field development, in particular to a method for predicting single well controlled geological reserves of shale oil horizontal wells. Background technique [0002] As an unconventional oil and gas resource, shale oil has become a major international and domestic strategic resource. Due to the low reservoir permeability, it is difficult to establish an effective displacement pressure system for water injection under the economic limit well pattern. Hirao + volume fracturing” method for quasi-natural energy development. Since the formation energy cannot be effectively replenished, the production decline in the shale oil development process is large, and the recovery rate is low. How to accurately predict the controlled geological reserves of a single well is directly related to the rationality of horizontal well development parameters (horizontal w...

AI Technical Summary

Problems solved by technology

[0003] At present, the single well controlled geological reserves prediction is mainly based on the numerical simulation method. Through single well geological modeling and numerical simulation, the single well controlled radius is calculated according to the formation pressure and then the single well controlled geological reserves are calculated. However, the numerical simulation method requires fine geological modeling. and accurate fluid, reservoir, and relative permeability curve data, especially after large-scale fracturing, it is difficult to quantitatively describe fractures by geological models, and the accuracy of numerical simulation has also been questioned

Images