Case Study: CoilFLATE Packer Saves More Than USD 150,000 in Indonesian Well
Download: CoilFLATE Packer Saves More Than USD 150,000 in Indonesian Well (0.22 MB PDF)
Shutoff treatment eliminates water production and use of workover rig
Challenge: Reduce water production to improve productivity.
Solution: DGS delayed gelation system for penetrating deep into the formation to reduce permeability. CoilFLATE inflatable packer system for reliability in high-pressure, high-temperature, harsh environments.
Result: Shut off water production. Eliminated pulling the production tubing and using a workover rig, for an estimated savings of more than USD 150,000.
Improve productivity in a targeted zone
The operator of an Indonesian well planned a water shutoff treatment to reduce water production from a targeted zone and improve productivity.
For the treatment, the operator selected the DGS delayed gelation system because of its ability to penetrate deep into the formation, where it gels to drastically reduce permeability. In addition, the gel time can be adjusted from a few hours to several days over a wide temperature range. Because of its water-like viscosity, DGS fluid can be placed in a low permeability matrix into which traditional polymers will not penetrate.
The CoilFLATE inflatable packer was chosen because of its unique inflation profile (more than 3:1) and its reputation for reliability in high-pressure, high-temperature (HPHT), harsh environments.
Harsh wellbore conditions
The CoilFLATE through-tubing inflatable packer was run to the setting depth and inflated to 2,500 psi [17 MPa], indicated by a pressure drop as the universal valve opened. The CoilFLATE packers are designed for extended exposure at up to 375 degF [191 degC] in harsh wellbore conditions. For the main treatment, 129 bbl of DGS fluid was pumped at approximately 0.8 bbl/min [127 L/min] through the CT and below the CoilFLATE packer. The differential pressure from below was as high as 3,500 psi [24 MPa]. After displacement of the treatment fluid with brine, the CoilFLATE packer was deflated and retrieved from the well.
Successful implementation and cost savings
The CoilFLATE packer was set successfully the first time on depth in the 41.2-in tubing. The water control gel was pumped at the required high-differential squeeze pressure through and below the CoilFLATE packer. The water zone was completely shut off, meaning that no water from that zone was produced. The solution avoided pulling the production tubing and the use of a workover rig, with an estimated savings of more than USD 150,000.
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