文档介绍：Chapter-3
Well Performance Analysis
Well performance analysis involves determination of optimum tubing size that will allow obtain maximum production from a pletion design. A typical pletion is presented in Fig. .
Fig. : Perforated pletion.
The production tubing acts as a throttle for the reservoir. As shown in Fig. , larger the opening of the valve (larger tubing diameter) greater the bottomhole. The increase or decrease in bottomhole flow has the following effects: one is the reservoir performance and the other tubing performance (flow through tubing). The effect of bottomhole flow can best be described in Fig. .
Fig. : Drawdown of a gas cap expansion drive reservoir
From the plot 1 in Fig. it can be seen that bottomhole flowing pressure (BHFP) is directly affected by production rate (flow rate, Q). For an oil well, the BHFP decreases linearly with increase in bottomhole flow until it reaches bubble point pressure (BPP). Below this pressure the relationship between BHFP and Q is non linear. One can obtain maximum openhole flow (AOF) at zero BHFP. Plot 2 of the Fig. describes tubing performance. For a given tubing diameter, BHFP (which is required to initiate tubing flow) initially decrease up to a point and then increases with increase in Q. It is also seen that for each diameter there is a maximum production that can be obtained. Largest production rate can be obtained by having largest diameter of the tubing as shown in Fig. .
Fig. : Tubing Performance Analysis
In this chapter the effect of bottomhole flow on both reservoir performance and the tubing performance will be discussed. A number of examples will be presented to provide a better understanding of well performance.
Inflow performance analysis
Several techniques have been proposed for determining the reservoir performance analysis. Most of the techniques require data produced from the flow test. The data includes the flow rates and bottomhole flowing pressure. Us