A Malaysian offshore well was worked over in February 2002 and recompleted. The well was experiencing unwanted water production from a lower producing zone which is at a depth where the deviation is nearly horizontal (83⁰ from vertical).
BiSN was identified as a potential solution due to the high deviation of the well and high expansion of the Wel-lok™ WSO (Water Shut Off) plug which could be set on wireline.
The expansion requirement is not possible with a traditional mechanical plug and isolating the lower zone with cement presented two complications; lack of quality of a cement plug at such a high deviation and the cost to spot the cement plug with a coil tubing unit.
The customer, a super major in Malaysia requested a plug that can be run through the 3-½” tubing and set above the water producing zone inside the 4-½” liner to reduce or shut off the unwanted water production.
BiSN’s Wel-lok™ WSO technology was chosen for its ability to pass through a small restriction and set in a larger diameter, whilst also giving good sealing (or flow restriction) capability.
We isolated the water-producing interval in a near-horizontal well, increased production and the operating life of the well.