EXPRESSION OF INTEREST - GZ Borehole - eDCRO - eDCRO

EOI/RFI No. PP-002

Rev. No. 0

EXPRESSION OF INTEREST (EOI) / REQUEST FOR INFORMATION (RFI)

24” OD Drilling to 6,500’ TVD (RV/DC)

1.

INTRODUCTION AND OBJECTIVE

The Nevada National Security Site (NNSS) is a U.S. Department of Energy, National Nuclear Security Administration (NNSA) installation, operated by Mission Support and Test Services, LLC (MSTS), comprising approximately 3,561 square kilometers (1,375 square miles) of federally owned land located in southeastern Nye County, Nevada. Located approximately 105 kilometers (65 miles) northwest of Las Vegas, Nevada, the NNSS is accessed from U.S. Highway 95, which roughly forms the southern boundary of the site.
MSTS is issuing this Request for Information (RFI) and Expression of Interest (EOI) to conduct market research and determine which companies would be interested in participating in a solicitation for the delivery of a wellbore, including management of all necessary subcontractors, to be drilled at the NNSS. To understand prospective Offeror’s experience and expertise, MSTS requires that Offerors provide a proposed technical approach to deliver a 24” diameter hole at a depth of 6500’ with the bottom 1400’ free of casing. The location of the drilling is the Rock Valley Direct Comparison (RV/DC) site at the Nevada National Security Site, NV. Generic wellbore requirements with further detail are in subsequent sections. Borehole minimum drift diameter
Open hole depth
Dogleg severity (DLS)
Localized DLS
Centerline deviation (drift)
2.

24”
5,100’ – 6,500’ TVD
< 3° drift/100 ft
<1.5° drift/10 ft
<200’ in any direction

BACKGROUND INFORMATION

In 2025 MSTS contracted coring and geophysical logging operations at the RV/DC site continuously from surface to a depth of 6,857’. The coring operations were drilled with a Boart Longyear LF-350 rig. The well that was drilled in this operation was called UE-27a and is approximately 300 feet from the proposed RV/DC Ground Zero (GZ) Borehole location. An End of Well Report from this operation can be found in Attachment A. In addition to the geological data, Ultrasonic compressive velocity logs can be found in Attachment B and the daily water usage from those operations can be found in Attachment C. From this information, MSTS developed a conceptual well-bore design and several planning assumptions. Subsequent sections of this RFI show the results of that effort. As part of the exercise, it was determined that several design elements would need to be addressed via modification of existing equipment or first