Clariant Oil Services Restores Gas Well Production to 2.5 mmscfd via Batch Treatment

Benefits

• Dead well restored to production at 2.5 mmscfd
• Well produced for an incremental 17 days before adopting the routine pressure build-up cycle
• Stable process plant throughout treatment
• Simple, fast and cost-effective treatment using combined technologies 

Background

A major international oil company operates a gas / condensate field in the Southern North Sea. Well J02 is operated on a cycling regime with a bottomhole pressure of 349 psi. The well watered out and could not be restarted despite several attempts after pressure build-up periods. This field had not used chemical deliquification previously, and the well remained shut-in for a period of two months.

Clariant Oil Services Solutions and Value Delivered

Clariant Oil Services conducted extensive laboratory work to evaluate and formulate chemical foaming and de-foaming agents for this application. The combination of WellBoost 113 (foamer) with FOAMTREAT 9457 (de-foamer) delivered the best performance for this batch treatment.

In addition, both products are environmentally acceptable and are classified as Gold with no-substitution warnings. Compatibility with the field well flushing fluid SURFTREAT® 1818, also from Clariant Oil Services, was considered as well.

A successful topside squirt test was performed to evaluate adverse effects on process separation. Following this, the batch downhole treatment program was designed in close collaboration with the operator.

The well started up after treatment and delivered approximately 2.5 mmscfd of additional gas. The well continued to produce for 17 days providing an additional 40 mmscf of gas over the course of the treatment, which otherwise would not have been realized.

Due to the success of Clariant Oil Services’ treatment program – the first application of its kind in this field – the operator extended the chemical deliquification campaign to all liquid-loaded wells in the field, and intends to trial in other fields in the Southern North Sea region.

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* Previously sold as SURFTREAT® FM 9440