EQT Sets US Onshore Lateral Record at 29,070 Feet With Longwell 9H in West Virginia Marcellus

EQT Corporation has drilled the longest horizontal well ever completed on land in the continental United States. The Longwell 9H reached a lateral length of 29,070 feet in the Marcellus Shale of Wetzel County, West Virginia. The well's total measured depth of 37,610 feet also sets a record for the deepest onshore shale well in the Lower 48.

Record Dimensions in Plain Numbers

At 29,070 feet, the Longwell 9H lateral stretches 5.51 miles through the Marcellus formation. The total measured depth of 37,610 feet equals 7.12 miles. EQT described that distance as the equivalent of nearly 26 Empire State Buildings stacked end to end. The company reported zero hazard points and 100 percent of the lateral section drilled within target.

Previous Record and the Expand Energy Connection

The prior US onshore lateral record belonged to Expand Energy, the operator formerly known as Chesapeake Energy. Chesapeake emerged from Chapter 11 bankruptcy in February 2021 and rebranded as Expand Energy in 2024 following an all-stock merger with Southwestern Energy valued at approximately $7.4 billion. Expand Energy's BW Edge MSH 210H well in Marshall County, West Virginia, reached 27,657 feet in 2025, equal to 5.24 miles. EQT's Longwell 9H surpasses that mark by 1,413 feet, a 5.1 percent extension, within the same Appalachian corridor.

How the Rice Energy Acquisition Made This Possible

EQT's Wetzel County acreage position traces to its 2017 acquisition of Rice Energy for approximately $6.7 billion. The Rice brothers had assembled a contiguous Marcellus block straddling the West Virginia and Pennsylvania border, combining stacked-pay access in the Marcellus and Upper Devonian formations across Wetzel, Tyler, and Greene counties. That lease block provides the contiguous geometry required to drill a horizontal wellbore exceeding five miles. Without the Rice Energy consolidation, a 29,070-foot lateral in Wetzel County would not have been geometrically feasible.

Scale and the Efficiency Calculation

EQT's net Appalachian production runs at approximately 6.8 billion cubic feet equivalent per day, ranking it as the largest single-basin natural gas producer in the Lower 48 by throughput. Super-laterals reduce the number of surface pads required to drain a given lease block, cutting total footprint, permitting timelines, and water-handling infrastructure per unit of production. EQT's 2017 record lateral of 17,400 feet in Washington County, Pennsylvania, projected reserves of 42 billion cubic feet equivalent and development costs of $0.36 per thousand cubic feet equivalent. A lateral 67 percent longer accesses proportionally more reservoir contact area, which, all else equal, scales toward approximately 70 billion cubic feet equivalent per well under similar geology and completions design. That is an illustrative comparison, not a formal reserve estimate, and actual outcomes depend on local pressure support and fracture geometry.

Natural Gas Demand and the Marcellus Expansion Rationale

EQT has targeted AI data center electricity demand in southwestern Pennsylvania as a commercial catalyst for Appalachian gas volumes. High-throughput data center clusters near Pittsburgh require firm power capacity, which Marcellus gas can deliver at low cost via existing gathering and transmission infrastructure. Longer laterals reduce per-unit drilling and completion costs, improving the netback competitiveness of Appalachian production against Permian associated gas competing for Atlantic Coast export capacity. Super-laterals exceeding five miles have accelerated across the Marcellus and Utica plays since 2024, driven by lease-block consolidation and improved rotary steerable drilling technology.