Hybrid Microseismic and Microdeformation Monitoring of a Coal-Seam-Gas Well

Fig. 1—Monitoring depths relative to stage perforations. TVD=true vertical depth.

Providing confidence that hydraulic-fracture geometries are relatively confined to target coal seams and do not grow upward into beneficial groundwater aquifers is a primary concern. A hybrid downhole microseismic and microdeformation array was deployed to monitor fracture stimulation of a vertical coal-seam-gas (CSG) exploration well in the Gloucester Basin in New South Wales, Australia, to provide more-accurate insight into overall fracture height. These technologies complement each other by providing unique, far-field determinations of hydraulic-fracture geometry.

Introduction

Increasing community and regulatory concern regarding exploration and production of CSG and fracture stimulation has placed extreme constraints on titleholders in New South Wales, to the point of the government rescinding some exploration permits and titleholders nearing a halt to further exploration. 

The operator is determined to provide evidence that CSG pilot exploration wells and, in particular, fracture stimulation are not affecting beneficial aquifers or interacting with faults. It is important that the operator be able to provide scientific explanations that are understandable and accessible to the community and assist in regulatory approval processes for the industry. 

This article, written by Special Publications Editor Adam Wilson, contains highlights of paper SPE 182300, “Hybrid Downhole Microseismic and Microdeformation Monitoring of a Vertical Coal-Seam-Gas Well,” by R. Durant and T. Francis, SPE, Halliburton, and R.L. Braikenridge, SPE, and M. Roy, SPE, AGL Energy, prepared for the 2016 SPE Asia Pacific Oil and Gas Conference and Exhibition, Perth, Australia, 25–27 October. The paper has not been peer reviewed.
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Hybrid Microseismic and Microdeformation Monitoring of a Coal-Seam-Gas Well

01 November 2017

Volume: 69 | Issue: 11

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