Wellsite compression in Pakistan
The Bhit Compression Project is a robust response to the natural depletion of the Bhit gas reservoir north of Karachi in Pakistan, designed to maximise productivity as the gas pressure reduces.
Flexibility of operation
A concept study was carried out to consider the possible options to provide a solution. The selection was made based on the following criteria:
- Favourable economics, due to increased total gas recovery.
- Significant safety advantage, identified by HAZID review (comparing diverse operations to the common facilities proposed in other options).
- The possibility of phased, time managed installation according to individual wellhead requirements.
- High reliability, demonstrated to have minimal impact on the overall reliability of the facilities.
- Maximum flexibility of wellhead operations.
- The option to decommission individual compressors as wells become redundant.
- Increased potential for re-use of the compressors at new well sites.
The design choice selected involved wellhead compression. Following the concept phase detailed design, procurement and construction were carried out to install 4 x 3.3MW and 6 x 1.9MW Ariel Reciprocating Compressors plus Caterpillar Gas Engines.