Eastern Gas Shales Project: offset well testing program, interference testing of Columbia Gas Transmission Corp. , Wells 10056A and 10056B, Meigs County, Ohio. Final report

The objective of this study is to quantitatively determine variations in reservoir pressure performance between a control well and two offset wells prior to and after microstimulation of the borehole. The acquisition of substantiated data to ascertain reservoir interconnectedness in an area of established gas production is fundamental to the development of a strategy involving spacing and stimulation to influence future gas drilling activity. In order for such an evaluation to even begin, certain information is required. Such tasks are: (1) conduct short-term well tests in both offset wells to check for pressure communication at offset well test site, as per procedure developed by DOE support contractor and directed by DOE TPO. Integrate data from core, log, and pressure tests for evaluation; (2) if required by Section 1 or later field results, conduct microstimulation(s) as prepared by DOE engineering support contractor and directed by DOE TPO; (3) perform long-term (45 days) interference test as prepared by DOE engineering support contractor and directed by DOE TPO. Support collection of pressure data from control and offset wells in conjunction with DOE engineering support contractor. Field operations generally proceeded smoothly despite relatively complicated downhole equipment in the offset wells in which bottomhole pressuresmore » were monitored from three separate zones in the shales separated by three Lynes inflatable packers. This was the first time that this type of temporary completion was attempted in the eastern United States. Two failures of the electrical cable that transmitted pressure signals in well A and three packer failures in well A were the only mechanical problems encountered. These failures were quickly remedied and the tests were successfully concluded.« less