Sizing Proposals forTA-8(FSD): A.BASIC DATA:tubing OD3 1/2" casing OD7" top of perforation2200 pump setting depth2000m Static BH temp.221OF surface WH temp.60 Primary Power Voltage33 Primary Power Frequency50 Oil gravity30OAPI Gas Specific GravityNA Water cut (%water)10 Bubble Point Pressure 300Gas Oil Ratio tstm CO 2 0 H 2S0 N 2 0 Desired Tubing Pressure: 300 Desired Flow Rate1500Reservoir Pressure2980 PI4(PI) Reference depth, m: 2280 Viscosity cp @ temp& press: 1) Point 1, temp 85 , press: 2 2) Point 2, temp 60 , press:14 3) Point 3, temp 30, press:3531

B. Viscosity Calculation As is known from the well data provided, the viscosity is 14CP at 60, it has little effect on ESP. SO, it can be ignored.C. Forecast of production capacity (predicting well production rate) As is desired by the well data sheet, the pump setting depth: Hp=2000m, Desired Tubing Pressure: Po =300psi, Design flow rate (q) is 1500bpd. The PI curve can be drawn and described according to above information and calculated as following:2

Pwf and Flow Rate Diagram WELL NO TA-8 ITEM Pwf (psi) 2980 2605 2230 1480 300 Flow Rate (bpd) 0 1500 3000 6000 10720

1 2 3 4 5

As shown above, PI curve is given base on well information, Max Productivity of well : qb=PI (PR-Pb) =4(2980-300)=10720bpd where Reservoir Pressure PR=2980 psi, PI=4bpd/psi;Pb=300 psi And calculation for the flow pressure under design flow rate as in below: pwf = PR-q/PI = 2980-1500/4=2605 psi And the calculation of Fluid Over Pump (HC )under design flow rate as below: Because flow pressure is much more than Bubble Point Pressure, there is no free gas in the fluid the effect of gas can be ignored. 3 HC =Pwf 0.7-(H-HP) = HC = 2605* 0.7-(2280-2000) =1544m

D. TOTAL DYNAMIC HEAD The next step is to determine the total dynamic head required to pump the desired capacity. The total pump head refers to feet (meters) of liquid being pumped and is calculated to be the sum of: Pump setting depth; Well tubing friction loss; Wellhead tubing pressure Fluid level over pump. The simplified equation is as follows: TDH = HP +Ft +Po - Hc =2000+30+3000.7-1544 =696m4

Where: TDH = total dynamic head in feet (meters) delivered by the pump when pumping the desired volume. Hp = pump setting depth:2000 meters. Ft =the head required to overcome friction loss in tubing measured in feet (meters). Refer to Pressure Loss Chart attached and tubing size to determine the friction loss. Ft =pump setting depth times the friction loss factor divided by 1000. By referring the Chart, the 3-1/2 tubing friction factor is 15 meters per 1000 meters at a flow rate of 1500bpd. Ft =2000 * 15/1000 = 30 meters Po= tubing pressure=300psi0.7m= 210m Hc =Fluid level over pump = 1544m5

To ensure the continuous pumping operation in the future for reservoir pressure and fluid level decline, depletion of 10% is considered for the current reservoir pressure and fluid level. Thus the PI curve can be re-drawn as below: PI curve is given base on well information where Reservoir Pressure PR=2980 psi, PR1 =0.9 PR, PI=4 bpd/psi, PI1 =0.9 PI Bubble Point Pressure Pb=300 psi, Max Productivity of well : qb= The PI curve can be described according to above information and calculation as following:6

Pwf and Flow Rate Diagram Well No.TA-8 Ite m Pwf (psi) 2682 2265 1849 1015 300 Flow Rate (bpd) 0 1500 3000 6000 8575

12 3 4 5

And, calculation the flow pressure under design flow rate is as below:7

TDH should be recalculated as below: TDH = HP +Ft +Po - Hc =2000+30+(300psi0.7m)-1306= 934m TDH = total dynamic head in meters delivered by the pump when pumping the desired volume. Hp = pump setting depth: 2000 meters. Ft =the head required to overcome friction loss in tubing measured in feet (meters). Refer to Pressure Loss Chart attached and tubing size to determine the friction loss. Ft =pump setting depth times the friction loss factor divided by 1000. By referring the Chart, the 3-1/2 tubing friction factor is 15 meters per 1000 meters at a flow rate of 1500bpd. Ft =2000 * 15/1000 =30 meters Po= tubing pressure=300psi0.7m= 210m 8 Hc =Fluid level over pump = 1306m

E. Pump Type Selection:Refer to the pump selection data table and Pump performance curves (50 Hz), for pump types and ranges. Based on expected fluid production rate and casing size, select the pump type which will, at the expected producing rate, be operating within the pump's operating range and nearest to the pump's peak efficiency. Now select pump for 1500 bpd to fit in 7 casing: A review of the performance ( head-capacity) curve based on flowrate of 1500bpd results in a choice of QN20 pump. The lifting head per stage of QN20 pump of 130 series is 9.6m at a flowrate of 1500bpd. To lift the fluid to surface to a head of 934 meters,the pump stages required is calculated as below. Number of stages=THD/head per stage =934 / 9.6= 97.3stages. Selected pump housing #6 with 97 stages .9

F. Motor Selection:To select the proper motor size for a predetermined pump size, you must first determine the brake horsepower required by the pump. The horsepower per stage is obtained by again referring to the performance curve for the selected pump and reading the value of the right scale. The brake horsepower required to drive a given pump is easily calculated by the following formula: BHP = Total Stages x BHP (per stage) x Sp Gravity =97* 0.45 * 0.89= 38.8 kW. Where: Sp Gravity of Fluid r(f ) = 141.5/(131.5+api )x (1- Watercut) +w x Watercut = 141.5/(131.5+30) x (1 -10%) + 1 x 10% =0.88 x 0.9 + 0.1=0.89 10

Pmotor= BHP + Pprotector + Pintake =38.8+4+1 =43.8 KW As the tender documents required, the Motor design Capacity should equal to or more than 120% of the motor working capacity in the normal operation condition. So the min. motor power capacity is 43.8kW * 1.2=52.56kW Referring the Motor Rating Specifications, the suitable motor size is 60kW. Its Rated current is 41A, Rated voltage: 1140V, model is YQY143-60D.11

G. Power cable selection:The proper cable size is dependent on combined factors of voltage drop, amperage and available space between tubing collars and casing. Under most condition, select 1# cable for the operating current over 110AMP; select 2# cable for the operating current between 110 and 83AMP; select 3# cable for the operating current between 83 and 58AMP; select 4# cable for the operating current under 58AMP. The selected Motor current is 41A, referring to the current and performance parameters, AWG 4# cable (Round) with 5KV rating is selected; the length is 2000m + 60m of which is used to connect the well head to the junction box and from junction box to the control panel). Total length is 2060 meters. #4 Cable current rating is 60A. 12

H. Transformer: The type of transformer selected depends on the size of the primary power system and the required secondary voltage. On existing systems, some of DQESP units will operate without the use of an additional transformer. In choosing the size of three single-phase transformers the following equation is used to calculate total KVA required:

= (1140+169.6) x 41 x 1.73 /1000 = 93 KVA13

Where: KVA = Kilo-Volt-Amp or 1,000 Volt-Amp Vs= Surface Voltage=motor name plate voltage + cable voltage drop (Cable voltage drop ( U)=cable length x factor. See Chart of Cable Voltage Drop per 1000 ft. Voltage Drop factor =( Voltage Drop per 1000ft at 20) / 305 * (correction factor @120) * setting depth =18.5 / 305 * 1.398 * 2000m =169.6V A m= Motor nameplate current in amps=4114

As required in ITB, the KVA rating of transformer shall be selected based on 110% loading of calculated rating of transformer and 50KVA auxiliary load, the required KVA of transformer is as below: Total KVA = 93KVA x 1.1 + 50KVA = 152.3KVA According to transformers operating experience in Sudan 1/2/4 bloc and in considered that enhance the transformer interchange, the appropriate transformer parameters: Capacity: 250 KVA, Primary Volts: 33KV, Secondary Volts: 1100~3300V, Auxiliary: 415V, 50KVA.15

I.Control Panel:

The motor controller is a state-of-the-art digital control. This unit performs all the shutdown and restart operations. It provides all the basic functions, such as underload, overload, phase imbalance, sing-phase protection, magnetic-type overcurrent relay, underrcurrent shutdown relay, hand-off-automatic selector switch, recording ammeter, downhole pressure and temperature readout etc. Selection should be primarily based on these three factors: 1) voltage rating; 2) current rating; and 3) horsepower rating.16

According to transformer power supply voltage (1100-3300V) and motor current (41A) , and also referring to tender documents requirements, it is commented to employ Reda 3.6kV/150A with Vortex Motor Controller as control panel.

J. Protector: Type: QYH-130J, Single Protector17