EXPRESSION OF INTEREST - GZ Borehole - eDCRO_111853 - eDCRO_111862.pdf

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 24” Open hole depth 5,100’ – 6,500’ TVD Dogleg severity (DLS) < 3° drift/100 ft Localized DLS <1.5° drift/10 ft Centerline deviation (drift) <200’ in any direction

2. 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 principal design. Those elements are provided as well.

As this design is conceptual, alternative approaches or tools will be considered if the Offeror can show they are technically equivalent and meet the minimum designs.

2.1 Conceptual wellbore diagram (WBD)

2.2 Conceptual Design element assumptions and approach

Design Element Conceptual assumption/approach

Circulation Method Dual-String Reverse Circulation for all hole sections

Hole Construction 12.25” OD Pilot and ream open for all hole sections

Logging Requirements Open hole logging in Pilot hole in all sections. And Casing & Cement integrity logs for Intermediate hole section.

See section 2.4 for specific logging requirements

Liner Hanger 28” x 42” liner hanger for 28” casing string will be required. The liner hanger does not need to hold pressure. Liner hanger is required to hold casing weight and allow for cementing operations and re-entry to intermediate liner.

See section 2.3 for proposed casing details.

Casing Running Method 42” casing will exceed 1MM lbs, Crane or other alternatives will need to be evaluated.

See section 2.3 for proposed casing details.

BOP/ Well control Given nearby offset drilling and geologic data, no well control was assumed in the pre-conceptual design. The requirement for well control needs to be vetted and possibly removed from operation. See Attachment A for additional geologic information.

2.3 Conceptual Casing Design and Considerations

General notes on casing operations:

• We are not anticipating any corrosive agents or fluids in the hole once drilling operations have ended.

• Float equipment was assumed to be composite for ease of drill out.

• The liner hanger does not need to hold pressure. Liner hanger is required to hold casing weight and allow for cementing operations and allow for re-entry to intermediate liner.

• Given the weight of the Surface (42”) and Intermediate (28”) sections, casing running approach must be outlined in the RFI response.

Hole section Hole section details Notes

Hole size (in) 56 Set depth (TVD -ft) 125 Annulus space (in) 6 Casing OD (in) 50 Casing wall thickness (in) 1 Casing weight (lb/ft) 523.3 Casing drift ID (in) 48

Conductor

Casing string weight (lbs) *65,415

This size pipe might require custom manufacturing.

*Casing string weights assume no buoyancy support.

Hole size (in) 48 Set depth (TVD -ft) 3000 Annulus space (in) 6 Casing OD (in) 42 Casing wall thickness (in) 1 Casing weight (lb/ft) 445.0 Casing drift ID (in) 39.2

Surface Casing

Casing string weight (lbs) *1,335,000

Surface casing string weight might drive need for crane or other support equipment during casing running.

*Casing string weights assume no buoyancy support.

Hole size (in) 36 Set depth (TVD -ft) 5100 Top of liner (TVD -ft) 2800 Liner length (ft) 2300 Annulus space (in) 8 Casing OD (in) 28 Casing wall thickness (in) 1 Casing weight (lb/ft) 292.0 Casing drift ID (in) 25.48

Intermediate Liner

Casing string weight (lbs) *811,600

String weight drives the need for a liner approach over long string.

String weight assumes 50 lb/ft drill pipe to run to TD.

*Casing string weights assume no buoyancy support.

Hole size (in) 24Production hole Total depth (TVD -ft ) 6500

Uncased

2.4 Logging Requirements

Mudlogging will be conducted throughout the drilling process.

Measurement While Drilling (MWD) including at a minimum GR, Resistivity, and Deviation will be required in all 12.25” pilot hole sections.

The logs below are required in all 12.25” pilot hole sections:

• Density

• Neutron Porosity

• Resistivity

• Temperature

• Acoustic Televiewer (ATV)

• Spectral (U, K, Th, Total) Gamma Ray

• Ultrasonic compressive velocity logs (DTC & DTS)

• Induction Resistivity/Conductivity

• Spontaneous Potential (SP)

• Gyro / deviation survey

The RFI response should include the maximum hole size for the logging tools listed above.

*The logs below will be required inside the 28” casing

• Multi-Arm (4+ Arm) Oriented Caliper

• Sonic cement bond log (CBL)

• Acoustic Televiewer (ATV)

• Gyro

* Technically equivalent alternatives to confirm casing and cement integrity will be reviewed and considered.

The logs below will be required inside the 24” open hole section

• Multi-Arm (4+ Arm) Oriented Caliper

• Acoustic Televiewer (ATV)

• Gyro

2.5 Drill string and Circulation methods.

Given the large OD, desire for maximal cuttings returned, and the need for good hole cleaning, our conceptual design assumed a dual-string reverse circulation approach for drilling all hole sections larger than 24”.

The RFI response should include your recommended dual-string reverse circulation sizes and design along with associated drilling parameters by hole section.

The RFI response should include a conceptual Bottom Hole Assembly (BHA) design for all hole sections.

The RFI response should also include if a dual-string or conventional drill string is recommended for the 24” hole section.

2.6 Drilling Fluids and Water Volumes

Water will be provided at the NNSS site, it will be trucked from a filling location that is 17 miles from the pad location.

In the offset coring well (UE-27a), losses were experienced at 120’ MD and continued throughout drilling.

The losses averaged ~ 12,000 gals/day (285 bbls) with a maximum of 20,000 gals/day (475 bbls), see Attachment A and Attachment C for details. Given the larger hole sizes for this well design vs the offset well, untreated losses can be expected to be noticeably higher.

The RFI response should include a recommended Loss Circulation Material (LCM) program and recommended water/ mud storage volumes given the hole sizes and anticipated losses.

2.7 Cementing Operations

We are not anticipating any corrosive agents or fluids in the hole or annuli once drilling operations have ended.

Minimum cement specifications are:

• Conductor - Cement to surface, no API class specified, minimum 1500 psi @ 24 hrs

• Surface - 500’ fill or better, no API class specified, minimum 1000 psi @ 24 hr

• Intermediate - 500’ fill or better, no API class specified, minimum 1000 psi @ 24 hr

The RFI response should include conceptual pump schedule for each hole section.

2.8 Site requirements and provisions

• All employees working at the NNSS must be United States citizens.

• MSTS will provide the geologists to perform the mudlogging.

• The drilling location and support areas will be prepared for heavy equipment and support vehicles by MSTS, LLC. Preparations will include clearing all vegetation and preparing the travel surfaces with a gravel road base.

• MSTS will manage all permitting required for operations at the site.

• Offeror to provide fuel for their own operations/equipment

• Offeror will provide water storage tanks and is responsible for ensuring storage volume is sufficient.

o Water will be provided by the site and trucked to the location.

o Assume Water Transportation from 5B fill station; 17 miles from site.

• Housing accommodations and cafeteria service, with limited hours of operation, will be available for a rental charge from MSTS. Use of these facilities is optional. The location of the housing and cafeteria on the NNSS is within 15 miles of the RV/DC project location, otherwise hotels are available in Pahrump or Las Vegas.

• Area lighting will be provided near the drilling location. You may choose to augment the area lighting with your own source.

• Sanitary facilities will be provided by MSTS, LLC. Sanitary facilities will be placed within 100 feet of the drilling location.

• Field offices will not be provided.

• No utility power exists on site. Power for all operations must be provided by generators that the offeror furnishes and maintains.

3. PROPOSED CONTRACTING STRATEGY

Anticipated Proposed Structure: Time and Materials structured contract

• Master Agreement with separate options:

o Base Scope - Design and Engineering Services o Option 1 - Long Lead Items (LLIs), Rig Modifications and Procurement o Option 2 - Construction and Drilling Operations

4. REQUESTED INDUSTRY FEEDBACK

To assist us in refining this strategy, in addition to the drilling approach and tools, please provide written responses to the following questions:

• Section A: Company Profile & Expression of Interest o General Info: Provide your company name, address, website, point of contact, and active SAM.gov Unique Entity ID (UEI) (if applicable).

• Socio-Economic Status: Identify your business size and socio-economic category (e.g., Large Business, Small Business, HubZone, 8(a), Service-Disabled Veteran-Owned Small Business, Woman-Owned Small Business).

o Contemplated NAICS Code: The North American Industry Classification System (NAICS) Code contemplated for this effort is 238910 Core drilling and test boring for construction - Size Standard of $19,000,000.00.

• Capability & Interest: Please provide your company capability and interest in the contemplated scope, to include the following:

o List and details of similar drilling operations your firm has managed in the last 5 years.

• For up to three comparable projects please include the following details:

o Well depth and diameter o Geologic summary o Drilling/ mining method o Wellbore diagram o Drilling schedule/ timeline o If your firm has experience with DOE or other government agency projects in the last 5 years, please list those operations.

o Assuming an award in October of 2027, what is your estimated timeline to start of drilling operations which needs to include long lead items, engineering, procurement and mobilization?

• Design and engineering scope and approximate timeline

• Long lead item list and approximate timeline

• Rig modifications and approximate timeline

• Technical Summary & Key Items: Please provide a summary of your recommended technical approach with the following key items address:

o Summary of the conceptual casing running approach capable of running the surface casing and intermediate liner.

o Conceptual dual-string reverse circulation drill string design.

o Recommended drill string approach for 24” hole section.

o Conceptual BHA designs for all hole sections.

o Conceptual LCM program and recommended water/ mud storage volumes o Conceptual cementing pump schedule for each hole section.

o Ability to achieve desired logging scope and maximum hole size for listed logging tools.

o What are the primary technical risks your team has identified.

o Any alternative approaches you recommend to reduce cost, schedule, or risk?

o Any key requirements you have identified that we are missing in our conceptual design, and if so what and why?

• Section B (Optional):

o Estimated Costs: Provide a Rough Order of Magnitude (ROM) cost estimate broken down by:

• Design & Engineering

• Long lead items & Rig modifications

• Time and Materials during operations

• Rental items

• Personnel cost

• Consumables

• Standby daily rate for X, Y, Z (e.g. delays, supporting geophysical logging)

• What additional information would you need from us to respond with a proposal/approach/cost estimate?

• Would a different than proposed contract structure improve interest and/or completion success, if so please describe the alternative structure.

5. SUBMISSION INSTRUCTIONS

Interested firms are invited to submit their Expression of Interest and Feedback package in accordance with the following guidelines:

Format: Submissions should be in PDF format.

Language: All responses must be in English.

Submission Channel: Submit via email to Shawna Ham at HAMSL@nv.doe.gov with the subject line:

"Response to EOI/RFI: GZ Borehole - [Your Company Name]".

Deadline: No later than 4:00 P.M. PST on XXX, 2026.

Questions regarding this RFI/EOI must be submitted in writing to the Point of Contact listed above no later than 1:00 P.M. PST on XXX, 2026.

Disclaimer: Please do not submit proprietary, confidential, or classified information in your response. Any information provided may be used by the organization to develop its final procurement strategy and solicitation documents.

6. ATTACHMENTS

Attachment A – RVDC-1.01-026RPT UE-27a Borehole End of Well Report.pdf Attachment B

– UE-27a Geophysical Logs LAS file.zip - Available upon request via email.

Attachment C – water usage table.xlsx

7. ACRONYM LIST

API – American Petroleum Institute

ATV – Acoustic Televiewer

BHA – Bottom Hole Assembly

CBL – Cement bond log

DOE – Department of Energy

DTC – Delta-T Compressional log

DTS – Delta-T Shear log

EOI – Expression of Interest

GZ – Ground Zero

ID – Inner Diameter

LCM – Loss Circulation Material

LLI – long lead items

MD – Measured depth

MSTS - Mission Support and Test Services, LLC

MWD – Measurement While Drilling

NAICS – North American Industry Classification System

NNSS – The Nevada National Security Site

NNSA – National Nuclear Security Administration

OD – Outer Diameter

PST – Pacific standard time

RFI – Request for Information

RV/DC - Rock Valley Direct Comparison

TVD – Total Vertical Depth

WBD – Wellbore Diagram