## Optimization of gas-lifted oil wells

Follow link: **Optimization of gas-lifted oil wells **(opens in a new page)

## Decline Curve Analysis software to forecast oil and gas wells

** DynamicForecaster** has integrated Decline Curve Analysis software to forecast oil and gas wells.

Historical *diagnostic* analysis is performed by automated curve-fitting, then the relevant parameters are used for forecasting.

Comparison of DCA methods:

- Exponential decline,
- Hyperbolic decline,
- Power Law Exponential decline,
- Transient Hyperbolic decline.

### References:

**References for Decline Curve Analysis **(opens in a new page)

## Production Analysis

Further charts show flow-rates ‘normalized’ by the approximate pressure drop within the reservoir and plotted against log(mass balance time) or the square root of time.

## Coal Seam Gas (CSG) Wells – calculate FBHP

Very few Coal Seam Gas Wells have permanent downhole pressure gauges, but well productivity depends crucially on the downhole pressure. To assess and predict field-level performance, it is essential to estimate the downhole pressure at least daily for all wells.

* DynamicForecaster* rapidly calculates the well performance from surface measurements:

- Flowing Bottom Hole Pressure (FBHP), allowing for bubbly water in the annulus
- Progressing Cavity Pump (PCP) performance, to monitor the actual performance versus expectations
- Turner critical gas velocity, for lifting water up the annulus.

### High calculation speed

The typical calculation speed exceeds 500/second for the round trip (retrieve data, calculate, store results). This enables fast review of historical well performance. For example, 3 years of daily calculations for 10 wells takes just 15 seconds.

## Shale Gas Wells – calculate FBHP

Calculations from surface measurements include: Turner critical gas velocity for lifting water and Flowing Bottom Hole Pressure (FBHP).

## Fluid flow (pressure loss) calculations

In * DynamicForecaster, *pressure loss calculations for fluid flow in wells and pipelines have many selectable options:

- gas or liquid
- friction factor method
- real gas compressibility (Z-factor) method
- gas viscosity method
- calculation direction (upstream or downstream)

Dimensions of well tubulars and pipelines are retrieved from the relevant database.