发明名称 ESTIMATING MEASURES OF FORMATION FLOW CAPACITY AND PHASE MOBILITY FROM PRESSURE TRANSIENT DATA UNDER SEGREGATED OIL AND WATER FLOW CONDITIONS
摘要 A segregated flow mechanism of oil and water usually takes place in the presence of strong gravity forces in subsurface environments, having specific geometrical and petrophysical properties undergoing simultaneous flow of multiphase fluids. The segregated flow of oil and water is modeled as a two-layer reservoir system, based on the observed data. Accurate estimates or measures of the values of phase mobility of oil and water, in addition to the actual flow capacity of the formation are provided. Reliable reservoir characterizations and reserve estimations are provided based on the in-situ conditions of oil and water in the reservoir.
申请公布号 US2016222765(A1) 申请公布日期 2016.08.04
申请号 US201514613780 申请日期 2015.02.04
申请人 Saudi Arabian Oil Company 发明人 Nooruddin Hasan A.;Rahman Noor M. Anisur
分类号 E21B41/00;G06F17/50;G01V99/00;G06F17/10 主分类号 E21B41/00
代理机构 代理人
主权项 1. A computer implemented method of determining a measure of oil phase flow capacity from an oil production zone and water phase flow capacity from a water production zone as segregated flow in a layer of a subsurface reservoir based on a pressure transient test of the tested reservoir layer, the computer implemented method comprising the steps of: obtaining formation flow parameters for the oil production zone and the water production zone; obtaining a test measure of well pressure during the pressure transient test of the layer; calculating a test measure of well pressure change during the pressure transient test of the layer; calculating a test pressure derivative of well pressure at sampled instants of measurement during the pressure transient test of the layer; determining an estimated value of oil phase flow capacity of the oil production zone; determining an estimated value of water phase flow capacity of the water production zone; determining a model wellbore flowing pressure of the layer based on the test measure of well pressure of the layer; determining a model oil production rate for the layer based on the model wellbore flowing pressure and the formation flow parameters; determining a model water production rate for the layer based on the model wellbore flowing pressure and the formation flow parameters; comparing the model wellbore flowing pressure with the test measure of well pressure; comparing the model measure of well pressure change with the test measure of well pressure change; comparing the model pressure derivative with the test pressure derivative; and if the model measures of pressure and test measures of pressure match within an acceptable tolerance, storing the formation flow parameters of the tested reservoir layer and the determined model oil production rate and the determined model water production rate for the layer; and, if not, adjusting the formation flow parameters of the layer, and repeating the steps of determining a model wellbore flow pressure, determining a model pressure derivative, determining a model oil production rate, determining a model water production rate and comparing based on the adjusted formation flow parameters of the layer.
地址 Dhahran SA