Unconventional/complex reservoirs

Digital Solution Reduces Liquid Loading in a China Unconventional Gas Development

This paper describes a new intelligent dosing technology to reduce liquid loading in an unconventional tight gas reservoir.

Reservoir layering scheme.
Fig. 1—Reservoir layering scheme.

Gas field C is an unconventional tight gas reservoir in central China. Horizontal-well multistage hydraulic fracturing has proved effective in this field. However, with continuous production over time, reservoir pressure declines, which results in a decrease in gas production rate below the critical gas velocity, leading to accumulation of liquid in the wellbore (liquid loading), which in turn results in backpressure and formation damage. To mitigate these challenges, a versatile intelligent dosing technology has been piloted to reduce liquid loading.

Field Issues

The field produces from four main reservoirs: Benxi, S2, S1, and H8, as shown from bottom to top in Fig.

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