PRE-FRACTURE INJECTION SURVEYS - A NECESSITY FOR SUCCESSFUL FRACTURE TREATMENTS

Successful fracture treatments over large intervals are often difficult to obtain. In the Laredo Lobo gas field in Webb and Zapata Counties, TX, successful fracture treatments over large intervals are critical for economic success of the field. Conoco Inc. uses a prefracture injectivity test along with temperature and gamma ray logs to ensure that the entire completed interval will be treated during the fracture job. If the entire completed interval is not being treated, the logs act as a road map to determine where additional perforations are required.