摘要
Abstract
The process of separate-layer fracturing & commingled production is often used in tight sandstone gas wells for commercial production.The averaged single-layer well test interpretation model is adopted for conventional well test interpretation,so the interpretation results cannot reflect the true information of each pay zone accurately.In this paper,after the separate-layer fracturing & commingled production,drawdown test (268 hrs.),build-up test (468 hrs.),and production logging were conducted in 4 pay zones of a certain well,all the data of which were interpreted by using the single-layer and multi-layer well test interpretation models,respectively.It is shown that in 3 types of single-layer well test interpretation models,the parameters of 4 pay zones in this well are averaged and all indexes are well fitted,indicating this model's ambiguity.Besides,in the multi-layer well test interpretation model,the separate-layer production rate was introduced into the production logging interpretation results as an additional constraint to carry out fine well test interpretation on multi-layer commingled gas producing wells.And the log-log curves and log curves of pressure and pressure coefficients,the pressure history and the separate-layer production rates are well fitted,and the parameter values of each layer are obtained,such as skin factor,half fracture length,permeability and boundary.It is concluded that by virtue of multi-layer well test interpretation,the ambiguity of well test interpretation results of commingled gas producing wells is reduced and the parameters of each reservoir are evaluated quantitatively.This research result provides guidance for the production proration of gas wells.关键词
致密砂岩气井/分压合采/生产测井/分层产量/精细解释/试井/储层信息/动态描述/鄂尔多斯盆地Key words
Tight sandstone gas well/Separate-layer fracturing and commingled production/Production logging/separated-layer production rate/Fine interpretation/Well test/Reservoir information/Dynamic description/Ordos Basin
