Wellbore Gas Lift Valves

for gas lift wells, valve information is important to accurately compute gas lift performance, optimization, and bottomhole pressure in the absence of gas lift valve data, injection will be assumed at the lowest point in the well with adequate delta pressure from injection to production to support gas passage in the presence of gas lift valve data, the preferred method is to calculate downhole opening and closing pressures based off of the r ratio and test rack opening pressure if those values are missing, the designed surface opening and closing pressures are used to determine which valves are open, which is less accurate different valve types have different data requirements and assumptions in the schema to prevent the need for valve types from being required in the input schema pressure operated valves the most thorough calculation is performed with test rack opening pressure and r are provided alongside a positive port size nominal valve size will increase accuracy, but 1 5" is assumed when the provided value is null when test rack opening pressure and r are not provided, simplified calculations are performed based on input surface closing and opening pressures, which have an inherent assumption about surface pressures under designed conditions dummy valves the system will infer a dummy valve when port size, surface opening, and surface closing pressures are all 0 orifice valves the system will infer orifice valves with port size is > 0 and surface opening and closing pressures are 0 variable data type unit of measure is nullable? default value description sourceid string no sourceid of the gas lift valve from wellview table wvtubcompmandrelinsert use idrec column sourcewellboreid string no sourcewellboreid in which the valve is installed sourcewellid string no sourcewellid in which the valve is installed from wellview table use wvtubcompmandrelinsert use idwell column sourcetubingid string no sourcetubingid in which the valve is installed from wellview table wvtubcomp use idrecparent column rundate datetime offset no run date of the valve from wellview wvtubcompmandrelinsert use column dttmrun pulldate datetime offset yes pull date of the valve from wellview wvtubcompmandrelinsert use column dttmpull glvstation integer yes station number of the valve typically orifice valves are station 1 from wellview wvtubcompmandrel use stationno installmd double ft no install depth of the valve from wellview wvtubcomp use column depthtopcalc testrackopenpressure double psig yes test rack opening pressure (ptro) of the valve from wellview wvtubcompmandrelinsert use trorun surfaceopenpressure double psig no designed surface opening pressure of the valve from wellview from wvtubcompmandrelinsert use pressurfgaugeopen surfaceclosepressure double psig no designed surface closing pressure of the valve from wellview from wvtubcompmandrelinsert use pressurfgaugeclose portsize double /64 inch no port size of the valve from wellview from wvtubcompmandrelinsert use column szport r double yes r ratio area of the valve port divided by the effective bellows area nominalvalvesize double in yes nominal valve size, ex 1", 1 5", 1 75" when null, 1 5" is assumed