![]() Lea Jr, Lynn Rowlan, in Gas Well Deliquification (Third Edition), 2019 Design ![]() The calibration of the valves is done in such a way that each unloading valve sequentially closes, and remains closed, as the unloading process continues down the well until the operating valve is reached and all the gas is injected through this valve, at which time all unloading valves should be closed. ■ĭetermining the opening and closing pressures of the unloading and operating valves from these pressures, the test-rack calibration pressures can be calculated. On the other hand, if the seat diameter is too small, the required injection pressure needed to pass the calculated gas flow rate could be too high and an upper valve might open. If the seat is too large, the gas flow rate through the valve will also be large and, in consequence, the injection pressure drops and it might not be possible to uncover the next valve below unless the surface gas flow rate is increased above its design value for that particular unloading valve. If the correct injection gas flow rate and valve’s seat diameter are determined, the operating pressure of a given unloading valve (which is the pressure needed to uncover the next valve below it) should be maintained at its design value while unloading through that particular unloading valve. ■įinding the seat diameters of the unloading and operating valves so that the right gas flow rate passes through each valve during the unloading process and during the normal operation of the well (after it has been unloaded). ■Ĭalculating the unloading liquid production and the required injection gas flow rate for each of the unloading valves. ![]() The depth of the operating point of injection, the final injection gas flow rate, and the liquid production of the well should be known prior to performing mandrel spacing calculations and their determination is the initial part of the design process, which is covered in chapter: Total System Analysis Applied to Gas Lift Design. The operating valve is the one through which gas is injected during the normal operation of the well. They must be closed once the unloading of the well is completed (the unloading process is described further in this introduction). Continuous gas lift design consists in carrying out the following calculations: ■įinding the depths of the unloading valves and the operating point of injection by means of a calculation procedure known as “mandrel spacing.” Unloading valves are valves located above the operating valve and their function is limited to injecting gas during the unloading process only. ![]()
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