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Technical Paper: Tractor-Conveyed Sensors and Chemical Packer are Utilized to Remediate an Extended-Reach Horizontal Uncemented Slotted Liner Completion in a Siliceous Shale Reservoir, Kern County, California, USA.

Society: SPE
Paper Number: 86938
Presentation Date: 2004
 Download: Tractor-Conveyed Sensors and Chemical Packer are Utilized to Remediate an Extended-Reach Horizontal Uncemented Slotted Liner Completion in a Siliceous Shale Reservoir, Kern County, California, USA. (1.43 MB PDF) Login | Register

 

Abstract

The siliceous shale reservoirs of the Monterey formation of Kern County, California, USA, are different from conventional sandstone and carbonate reservoirs. Production is primarily from thinly laminated porcelanite, and a fundamental problem that hinders exploitation of shale reservoirs is accurate identification of hydrocarbon and water resources.

In this study a downhole well tractor system was used to convey production logging sensors into a horizontal uncemented slotted liner to determine the production profile. Later, coiled tubing was used to place an annular chemical packer in an effort to shut off water production.

Production was achieved through extremely small pores and enhanced through small- to large-scale natural fractures. Drilling and completion techniques include extended-reach horizontal uncemented liner configurations. Several wells experienced large water cut increases shortly after completion.

Slotted uncemented slotted liners precluded the use of isolated interval testing. Concentric power-fluids attempts lacked the accuracy and resolution required for proper reservoir management. So the decision to run a comprehensive integrated production logging tool capable of quantifying flow profile in uncemented slotted liners was chosen.

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