Spud: Definition, Drilling Process, and Regulatory Reporting

What Is a Spud?

A spud marks the moment drilling begins on a new well, the first rotation of the drill bit breaking ground at the surface or seafloor. Operators report the spud date to regulators including the AER in Alberta, the NDIC in North Dakota, Sodir in Norway, and NOPSEMA in Australia, and the spud date initiates the statutory clock for many lease and licence obligations across international petroleum jurisdictions.

Key Takeaways

Spud is the industry term for the start of drilling, triggered when the bit begins rotating below surface or seafloor, and is tracked by every major oil and gas regulator as an official well-lifecycle milestone.
Spud dates tie into lease obligations such as commitment wells, drill-or-drop provisions, and continuous drilling requirements under the terms of a CAPL 91 freehold lease, a BLM federal lease, or a state Crown lease.
Operators, service companies, regulators, and investors all track spud activity because the aggregate weekly spud count is the primary leading indicator of future oil and gas supply.
Regulatory reporting of spud dates follows AER daily spud reports in Alberta, the NDIC daily activity report in North Dakota, NOPSEMA well-activity notifications in Australian Commonwealth waters, and Sodir drilling permit records on the Norwegian Continental Shelf.
Global spud activity in 2026 runs at approximately 550 active rigs in the United States and Canada combined, 180 rigs across the Middle East, 40 rigs on the Norwegian Continental Shelf, and 15 rigs offshore Australia.

How a Spud Works

A well is spudded after the surface location is constructed, the drilling rig is rigged up, and the conductor or surface hole is drilled or driven. On a typical North American land rig, the spud begins when the rotary table or top drive engages the kelly or drive shaft and the bit first contacts and begins breaking through the surface soil or caprock. The driller records the spud time to the nearest minute in the tour sheet, and the well-site supervisor reports the spud to the operator's drilling office, which in turn notifies the applicable regulator.

Offshore, the spud moment is cleaner: the subsea BOP is landed on the temporary guidebase, the drill bit is lowered through the BOP and the conductor, and rotation begins below the seafloor. On a jackup rig in shallow water, the cantilever is extended over the wellhead location and the rig floor equipment engages the bit, mirroring the onshore process with an offshore platform.

After the spud, the drilling program proceeds through discrete hole sections. The first section is typically 20-inch or 26-inch diameter for onshore wells, advancing to roughly 50 m (164 ft) or as deep as 800 m (2,625 ft) depending on jurisdiction and surface geology. Surface casing is then run and cemented, after which the BOP is installed and the well is ready for the deeper sections. The spud date commonly refers to the spud of the top hole, though some operators track a separate rig-release or reached-TD date as the end of the drilling phase.

Spud Reporting Across International Jurisdictions

Every major producing country captures spud data as part of statutory well reporting, and regulator feeds from these filings power the commercial intelligence used by Baker Hughes, Enverus, Rystad Energy, Wood Mackenzie, and the International Energy Agency. In Canada, the AER publishes daily spud reports for Alberta wells via the Production Audit and Reporting System, and the BCER and Saskatchewan's Ministry of Energy and Resources publish equivalent data for their jurisdictions. Spud dates reconcile against well-licence commitments, including continuous drilling provisions on Crown leases and drill-or-drop obligations under private freehold leases using the CAPL 91 standard form.

In the United States, the NDIC Oil and Gas Division publishes a daily drilling rig list for North Dakota Bakken activity, showing each rig's spud date, operator, lease, and county. The Texas Railroad Commission's W-1 drilling permit system captures spud dates for Permian, Eagle Ford, and East Texas activity. Colorado, New Mexico, Oklahoma, Pennsylvania, and West Virginia maintain parallel reporting. Offshore, BSEE publishes monthly activity reports for the Gulf of Mexico and Pacific OCS, and the Bureau of Ocean Energy Management tracks lease commitments that depend on spud dates.

Norway's Sodir publishes drilling permits and well-activity logs through its FactPages portal, with each well given a unique NPD identifier at the permit stage. Sodir data covers every operator on the Norwegian Continental Shelf, including Equinor, Aker BP, Var Energi, and TotalEnergies. Australia's NOPSEMA receives well-operation management plans and spud-activity notifications for Commonwealth offshore wells in the Carnarvon, Browse, and Bass Strait basins, while state regulators in Queensland, South Australia, and the Northern Territory cover the Cooper Basin, Beetaloo, and other onshore activity. The Middle East NOCs (ADNOC, Saudi Aramco, Kuwait Oil Company, Qatar Energy) maintain internal spud registers and report aggregate activity through national oil company disclosures and OPEC Monthly Oil Market Reports.

Fast Facts

North Dakota's Williston Basin sustained a weekly spud count of 25 to 35 new wells through most of 2025, with the NDIC's March 2026 rig list showing 34 active drilling rigs and a monthly spud rate near 110 wells. The Permian Basin in West Texas and southeast New Mexico accounts for roughly 241 of the 525 total active US rigs in 2026, making it the densest drilling activity anywhere on earth measured by rigs per square kilometer.

Spud Dates, Lease Obligations, and Commercial Signals

The spud date is more than a technical milestone. It triggers obligations and payments across multiple stakeholder groups. For the mineral owner, the spud date typically converts the lease from a primary-term paid-up or delay-rental structure to a secondary-term held-by-production structure, provided the well eventually produces in paying quantities. Under the CAPL 91 freehold lease form that dominates Western Canadian mineral negotiations, spud within the primary term preserves the lease through the continuous drilling provision.

For the operator, the spud date starts AFE (Authorization for Expenditure) tracking against the approved drilling budget. Drilling cost overruns are measured against the days-from-spud curve, and service contractors invoice spread rates (day rates for the rig, mud engineer, directional drilling contractor, etc.) from the spud moment. Regulatory filings tied to spud include federal and state permit validity, BSEE Form BSEE-0123 for offshore wells, and AER Directive 056 applications that must be current on the spud date.

For investors and market analysts, aggregate weekly spud counts published by Baker Hughes (the weekly North American Rig Count) and Rystad Energy provide a six-to-twelve-month leading indicator of future production. A week-over-week rig count decline in the Permian in early 2026, for example, telegraphs slower production growth in late 2026 and 2027, which in turn affects commodity price forecasts at Goldman Sachs, Morgan Stanley, and RBC Capital Markets. OPEC+ production policy decisions reference US spud activity as a counterweight to managed Middle East output cuts.

Tip: Field crews sometimes distinguish between "spud with surface rig" and "spud with main rig" on wells where a top-hole rig drills the first 500 m (1,640 ft) and then a larger drilling rig moves on for the deeper sections. In AER Directive 036 and NDIC reporting, only the spud with the main drilling rig typically counts as the official spud date. Mineral-rights negotiators should confirm which event satisfies the drilling commitment under the relevant lease before assuming a lease is preserved.

Spud date: the calendar date on which drilling began, reported to regulators and lease stakeholders.
Spud in: verbal form used in daily operations: "we spudded in at 05:30 this morning."
Spud mud: the low-cost fresh-water bentonite mud used for the surface hole.
Initial spud: the start of the very first hole section; used when a well is spudded with a top-hole rig and later deepened by a main rig.
Kickoff: distinct from spud; refers to the depth at which a directional well begins to build angle from vertical.
Rig release: the opposite milestone; the moment the drilling rig is released from the well after reaching total depth.

Frequently Asked Questions

What does it mean to spud a well?

To spud a well means to begin drilling. The spud moment is the first rotation of the drill bit breaking ground at the surface or seafloor, and it is the official start of a well's active drilling phase. Regulators, mineral owners, and operators all track the spud date as the trigger point for lease obligations, permit timelines, and commercial commitments.

Where does the term spud come from?

The term originated from old shallow-drilling practices where a wooden or metal spud (a tool resembling a chisel or spade) was used to break ground before setting the first casing. The term carried forward into modern rotary drilling despite the tool itself no longer being used.

How is the spud date reported?

Spud dates are reported to the relevant regulator within 24 to 48 hours of drilling commencement. In Alberta, the AER receives spud notifications via the PAR system. In North Dakota, the NDIC receives spud reports through the daily rig list. Norway's Sodir captures spud data via FactPages, and NOPSEMA receives Australian offshore spud notifications under the Offshore Petroleum and Greenhouse Gas Storage Act 2006.

Why is the spud date important to landowners?

The spud date often determines whether a lease is preserved beyond its primary term. Under the CAPL 91 freehold lease standard common in Alberta and Saskatchewan, spudding a well during the primary term can preserve the entire lease under the continuous drilling clause, provided the operator follows through to completion and production. Missing the spud deadline can result in lease expiry and loss of access to the minerals.

How many wells are spudded globally each year?

Global well spuds in 2026 run approximately 60,000 to 70,000 per year, with the majority concentrated in the United States (roughly 11,000 to 14,000 onshore spuds per year), the Middle East (roughly 6,000 to 8,000), China (roughly 15,000 to 20,000 including CBM and tight gas), and Canada (roughly 4,500 to 6,000). Offshore spuds worldwide total approximately 1,200 to 1,500 per year, concentrated in the Gulf of Mexico, the North Sea, the Norwegian Continental Shelf, Brazil's pre-salt, West Africa, and the Persian Gulf.

Why Spud Dates Matter in Oil and Gas

The spud date is the industry's universal start-of-work signal, the moment when an operator's investment decision converts into dirt and steel on a rig pad. Every lease payment schedule, every AFE cash-out, every regulator's compliance clock, and every analyst's supply forecast traces back to the spud. For the rig crew turning to the right on a frozen Alberta pad, the landman protecting a lease's continuous drilling obligation, the NDIC geologist compiling the daily rig list, and the commodity trader reading the weekly Baker Hughes rig count, the spud moment is where paper becomes production.