Solving water-cut issues for a supermajor operator in Brunei.
A supermajor operator in Brunei had a well producing 75-90% water-cut, reducing the gas production rate of the well. The operator wanted to run a tool through 4.5″ tubing to isolate inside a 7″ production liner.
The customer desired a solution that could pass through a 3.9″ restriction and seal inside a 7″ perforated liner to shut off water. This required a tool that was 3.5″ diameter, which meant that high expansion was necessary to create an effective isolating barrier.
A BiSN Wel-lok™ WSO tool was deployed in the well to the isolation zone inside the 7″ production liner. The thermite heater was activated, melting the bismuth alloy. The low viscosity, liquid bismuth alloy flows like water, and was able to flow out to seal the 7″ liner and the perforations. The bismuth alloy then solidified, creating a barrier to shut off water.
BiSN provided the customer with a highly effective, high expansion Water Shut Off solution. This significantly reduced water-cut, allowing the operator to produce more gas and requiring less disposal of waste-water. BiSN was able to help the operator reduce HSE risks, operation time, and cost.
The Wel-lok™ WSO (Water Shut Off) has been specifically developed to reduce unwanted water production from wells with sand screen and open hole gravel pack completions (OHGP). Unlike any other solution on the market, the Wel-lok™ WSO tool seals the annulus and the wellbore in one operation without the need to perforate the sandscreen or squeeze the alloy into the open hole annulus. The melted alloy fills inside the completion and in the annulus to form a metal to metal sealing solution that is seamless, significantly reducing unwanted water production.
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