1、Calculations in Chapter 2-Definition of Intermittent Gas-LiftFieldWellInputSI UnitsEqn.2.2.1-Volume of gas per cycleAtarea of the tubing150.00cm2Lvpoint of injection depth457.20mPtaverage tubing pressure when the slug reaches the surface8273.71KPabase pressure in filed units101.35KPaVgs=559.85ft3Eqn
2、.2.2.2-Liquid produced per cycleLsluginitial slug length30.48mFBFfall back factor 0.60fractionAtarea of the tubing150.00cm2Lvpoint of injection depth457.20mQL=0.05m3Eqn.2.2.3-Injection Gas Liquid RatioLvpoint of injection depth457.20mLsluginitial slug length30.48mPtaverage tubing pressure when the s
3、lug reaches the surface8273.71KPaRGL=1338.74cu m/cu mEqn.2.2.4-High pressure storage volumeNmaximum number of wells injecting gas simultaneously2.00Qgiaaverage per-well injection rate0.71cu m/minQgicmaximum compressor output0.85cu m/minbase pressure in filed units101.35KPaTaverage injection time100.
4、00min/cyclePddischarge pressure861.84KPaPcmaximum required well surface injection pressure600.00KPaVh=22.06m3Eqn.2.2.5-Low pressure storage volumeNmaximum number of wells injecting gas simultaneously2.00Qgiaaverage per-well injection rate0.71cu m/minQgicmaximum compressor output0.85cu m/minbase pres
5、sure in filed units101.35KPaTaverage injection time100.00min/cyclettime takes for the gas to pass the separator5.00minutesPIlow-pressure or suction storage pressure172.37KPaPcicompressor intake pressure68.95KPaVL=134.99m3Calculations in Chapter 3-Types of InstallationsFieldWellInputSI UnitsEqn.3.5.1
6、-Fallback rateVplplunger velocity3.00m/secs1Vpl-axis intercept for a particular plunger type1.00m/secs2slope1.00(cu m/sec)/(m/sec)FB=2.00cu m/secEqn.3.5.2-Fallback lossFBfallback rate1.00cu m/secttime increament10.00secD DFB=10.00cu mEqn.3.5.3-Updated slug lengthLtlength of the slug100.00mFBfallback
7、 loss1.00cu mBtVolumetric capacity of the tubing1.00cu m/mLt+D Dt=99.00mCalculations in Chapter 5-Design of Intermittent LiftFieldWellInputSI UnitsEqn.5.2.1-Volume of gas per cyclePpdtubing pressure at valve depth when valve opens6894.76KPaDvdepth of the valve457.20mBtvolumetric capacity of the tubi
8、ng0.09cu m/mQ=2889.47cu mEqn.5.4.1-Valve area ratioPiodthe injection opening pressure at valve depth12500.00KPaPvcdvalve closing pressure at depth6800.00KPaPpodproduction pressure in the tubing when the valve opens4500.00KPaR=0.71fractionEqn.5.4.2-Tubing opening pressurefggas pressure correction fac
9、tor 0.90Pwhwellhead pressure 12500.00KPaPfliquid gradient450.00KPa/mQliquid column length100.00mPpod=56250.00KPaCalculations in Chapter 6-Troubleshooting Intermittent LiftFieldWellInputSI UnitsEqn.6.3.2.1-Static liquid levelDptdepth of the top of the perforations1000.00mPsbhbottom hole pressure500.0
10、0KPaPwhwellhead pressure800.00KParfliquid gradient68.00KPa/mDsl=1004.41mEqn.6.3.2.2-Liquid gradientwwater cut of the produced liquid0.50fractionAPIdegree of API25.00APIr rf=9.33KPa/mEqn.6.3.2.3-Initial liquid column lengthTcycle time in minutes25.00minqfproduction125.00cu m/DayDttubing inside diamet
11、er5.00cmFFliquid fallback factor0.05fractionDovvalve depth3850.00mQ=2999.49mEqn.6.3.2.4-Volume of Gas Injected Per CycleQgidaily gas flow rate1.00M cu m/DayTcycle time in minutes25.00minVg=17.36cu m/cycleEqn.6.3.2.5-Tubing opening pressure at valve depthfgwellhead pressure correction factor1.00fract
12、ionPwhwellhead pressure800.00KParfliquid gradient68.00KPa/mQinitial column lenght286.00mPpod=20248.00KPaEqn.6.3.2.6-Wellhead pressure correction factor due to the gas column above the liquidDovvalve depth3850.00mQinitial column length286.00mfg=1.35fractionEqn.6.3.2.7-Surface opening injection pressu
13、rePtrctest rack closing pressure1000.00KPaPpodtubing opening pressure at valve depth500.00KPaRarea ratio0.50fractionFGLgas factor0.30fractionPio=5000.00KPaEqn.6.3.2.8-Surface opening injection pressurePtrotest rack opening pressure1000.00KPaPpodtubing opening pressure at valve depth500.00KPaRarea ra
14、tio0.50fractionFGLgas factor0.30fractionPio=1666.67KPaEqn.6.3.2.9-Surface opening injection pressurePbtbellows pressure at operating condition1000.00KPaStspring equivalane pressure cause by spring tension100.00KPaPpodtubing opening pressure at valve depth500.00KPaRarea ratio0.50fractionFGLgas factor
15、0.30fractionPio=5333.33KPaEqn.6.3.2.10-Test rack bellows pressurePtrotest rack opening pressure1000.00KPaStspring equivalane pressure cause by spring tension100.00KPaRarea ratio0.50fractionPb=450.00KPaEqn.6.3.2.11-Average productivity indextliquid accumulation time10.00minrfliquid gradient68.00KPa/m
16、Dttubing inside diameter5.00cmAlff-200.00PI=0.08cu m/Day*KPaEqn.6.3.2.12-AlffAs-1000.00KPaFFfall back factor0.05fractionDovdepth of operating valve3850.00mQinitial column length286.00mrfliquid gradient68.00KPa/mAlff=-0.49fractionEqn.6.3.2.13-AsPsbhstatic reservoir pressure500.00KPaDovdepth of operating valve3850.00mDptdepth of the top of the perforations1000.00mrTtrue liquid gradient5.00KPa/mPwhwellhead pressure800.00KPafgwellhead pressure correction factor1.00fractionAs=13950.00KPaEqn.6.3.3.1-I
