Primeline leaves one East China Sea well, carries on with another

  • Exploration & Production

Primeline Energy Holdings Inc., an oil and gas exploration and production company, has plugged and abandoned one of its East China Sea wells as the well is not a commercial discovery. 

The LS23-1-1 well was the first of two exploration wells in Primeline’s current campaign in the East China Sea. The company said it would now continue with the exploration drilling programme for  its second well, the LS30-3-1.

The LS23-1-1 well was spudded on September 23 and reached total depth (TD) of 2,666m on October 21, 2015 and wireline logging data was subsequently acquired. According to Primeline, the well encountered sandstone units of Paleocene and early Cretaceous age, drilling through the geological sequence as anticipated and finished in basement rock.

It discovered several zones of gas bearing sandstone and evaluation of logging data indicated total cumulative net pay thickness of 14 metres, the company said. Primeline explained that the LS23-1 prospect was a technical discovery of hydrocarbon but not likely to be a commercial discovery. Therefore, Primeline has plugged and abandoned the well and will proceed with the drilling of the LS30-3-1 well on the basis of the agreed two well work programme.

LS30-3-1 is located in Block 33/07 in the East China Sea, approximately 20km north of the LS36-1 gasfield platform, and is targeting a large channel sand prospect. The prospect was originally mapped in 2009/2010 and refined during the 2014/2015 evaluation. The planned TD of the well is 1,800m, targeting the same reservoir as that of the LS36-1 gasfield.

The drilling rig HYSY941 is currently conducting the final operations for the LS23-1-1 well. Primeline says that, once completed, its contractor China Oilfield Service Ltd plans to mobilise the rig to the LS30-3-1 location subject to weather and sea conditions, allowance for necessary equipment maintenance and preparation and approval of the operation licence.

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