Attachment 4- 2001 Report of Wireline Logging Operations 0001

REPORT OF OPERATIONS

UNITED STATES DEPARTMENT OF THE INTERIOR

BUREAU OF RECLAMATION

Montrose County, Colorado

Subsurface Project No. 60D5207

August 2001

Prepared By:
SUBSURFACE TECHNOLOGY, INC.
Houston, Texas

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bor/6005207/Rcpon ofOperarions

1.0 INTRODUCTION

The United States Department of the Interior, Bureau of Reclamation (USBR) operates an Underground Injection Control (UIC) Class V brine injection well in Montrose County, Colorado. The well disposes of naturally occurring sodium chloride brine water that is recovered from the Paradox Valley along the Dolores River. The well operates under UIC Permit No. C051 08-00647, issued by the United States Environmental Protection Agency (USEPA), Region 7. The USEPA requested certain testing be conducted on the well following a Magnitude 4.3 seismic event that occurred on May 27, 2000. A meeting was held in Denver, Colorado on October 24, 2000, to define the testing that would be carried out on the well during the next available shutdown period. It was agreed that the USBR would attempt to run a mechanical casing caliper survey and two differential temperature surveys to determine the condition of the bottom of the well, the depth to the top of the fill in the well, and the fluid distribution into the injection interval. Subsurface Technology, Inc. (Subsurface) was contracted to provide engineering and project coordination for the performance of the tests. Subsurface created a work plan and prepared a Scope of Work and Potential Vendors List for the USBR to solicit services of a wire line logging company to run the test. Due to the necessity of logging the well under high-pressure wellbore conditions, it was agreed to conduct the test during a planned June 2001 shutdown period when ambient temperatures were well above freezing.
The USBR contracted Wood Group Logging Services (WGLS) of Houston, Texas, to provide the logging services and the testing was performed during the week of June 18, 2001. Injection of Paradox Valley Brine (PVB) into the well was discontinued on June 1, 2001, and the injection tubing was flushed with fresh water. By June 18, 2001 , the shutin surface pressure had declined to 1908 pounds per square inch gauge (psig). The bottom-hole pressure at the top of the perforations (14,068 feet below kelly bushing or 14,036 feet below ground level) was calculated to be 7985 psig based on a freshwater gradient of 0.433 pounds per square inch (psi) per foot of depth below ground level.

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