Interview Questions152

    The OFS Business Model: How Service Companies Make Money

    How oilfield services companies generate revenue through drilling, completion, and production services tied to upstream activity levels.

    |
    15 min read
    |
    2 interview questions
    |

    Introduction

    Oilfield services (OFS) is the sub-sector that makes upstream production possible. E&P companies own the reserves and the rights to produce them, but they rely on OFS companies for virtually every aspect of the physical work: drilling the wellbore, completing and stimulating the well through hydraulic fracturing, installing artificial lift equipment, providing production chemicals, and maintaining the well over its productive life. The OFS business model is fundamentally activity-driven: revenue scales with upstream drilling and completion activity, which in turn is driven by commodity prices and E&P capital spending decisions. This activity linkage makes OFS the most cyclical sub-sector in energy and creates distinct analytical challenges for energy bankers.

    The global oilfield services market was valued at approximately $146 billion in 2024, with the North American market accounting for roughly 35-40% of total activity. Understanding the OFS business model, its key players, service segments, and cyclical dynamics is essential for energy bankers who cover OFS companies, evaluate OFS acquisitions, or assess the cost side of E&P financial models.

    The Major Service Segments

    OFS companies provide services across the full lifecycle of an oil and gas well, from initial drilling through production optimization and eventual abandonment. The industry is organized into several major service segments.

    Drilling Services

    Drilling services encompass all activities related to creating the wellbore: rig operations, directional drilling (steering the wellbore horizontally through the target formation), drilling fluids (muds that cool the drill bit, stabilize the wellbore, and carry rock cuttings to the surface), measurement-while-drilling (MWD) and logging-while-drilling (LWD) tools (which provide real-time data about the formation being drilled), and cementing (sealing the casing to the wellbore to ensure well integrity).

    Drilling revenue is driven by the rig count (the number of active drilling rigs, published weekly by Baker Hughes) and dayrates (the daily rate charged by drilling contractors for the use of their rigs and crews). Higher rig counts and higher dayrates translate directly to higher drilling services revenue. The US rig count averaged approximately 580 rigs in 2025, down from the 2023 peak of approximately 750, reflecting the maturation of the upstream capital discipline cycle.

    Dayrate

    The daily fee charged by a drilling contractor for the use of its drilling rig and associated crew. Dayrates are the primary pricing mechanism in the drilling services segment and vary based on rig type (land vs. offshore, conventional vs. horizontal-capable), rig specification (depth rating, horsepower, automation level), geographic market (Permian Basin vs. international), and supply-demand dynamics (when rigs are scarce, dayrates rise; when excess capacity exists, dayrates fall). Onshore US horizontal drilling rigs typically command dayrates of $25,000-35,000 per day, while deepwater offshore rigs can command $300,000-500,000+ per day.

    Completion and Stimulation Services

    Completion services include all activities that prepare a drilled well for production: perforating the casing (creating holes that connect the wellbore to the reservoir), hydraulic fracturing (pumping water, sand, and chemicals at high pressure to create fractures in the rock), and installing production equipment (tubing, packers, artificial lift). Completion services, particularly pressure pumping (the hydraulic fracturing process), represent the largest cost component of a horizontal shale well, typically accounting for 50-65% of the total well cost.

    Pressure pumping (also called "frac" or stimulation) is the most revenue-significant OFS sub-segment in North America. A frac fleet (the combination of pump trucks, blenders, sand equipment, and control units deployed to a well site) costs $30-50 million to assemble and requires 30-50 crew members to operate. Frac fleet demand is driven by the number of wells being completed each month (the completion cadence), which in turn depends on E&P drilling activity and the DUC (drilled but uncompleted) well inventory. When E&P companies accelerate completions, frac fleet utilization increases and pricing power improves. When completions slow, excess frac fleet capacity emerges and pricing softens.

    The pressure pumping industry has undergone significant technological change in recent years. "E-frac" (electric-powered hydraulic fracturing) and "dual-fuel" (natural gas substituted for diesel as the pump fuel) technologies have reduced operating costs, lowered emissions, and created capital equipment replacement cycles that drive OFS capital spending. Companies like Liberty Energy and ProPetro have invested heavily in next-generation electric frac fleets, which command premium pricing from E&P clients due to their lower total cost of ownership and reduced environmental footprint. Simul-frac (simultaneously fracturing two wells from a single frac spread) has also gained adoption, increasing the number of stages completed per day per fleet and improving capital efficiency for both the OFS company and its E&P client.

    These technological advances affect energy banking in two ways: they change the competitive landscape (companies with newer equipment fleets gain market share from those with older diesel-powered fleets) and they create capital expenditure requirements that influence OFS company valuations and free cash flow generation.

    Production Services

    Production services include artificial lift (equipment that helps extract fluids from the wellbore when natural reservoir pressure is insufficient, such as rod pumps, electric submersible pumps, and gas lift systems), production chemicals (corrosion inhibitors, scale inhibitors, demulsifiers, paraffin control), well intervention and workover services (repairing or re-stimulating existing wells to restore or improve production), and water management (handling produced water from oil and gas operations).

    Production services revenue is less cyclical than drilling and completion services because it is tied to the existing producing well base rather than new drilling activity. Even when E&P companies cut drilling budgets, existing wells still require artificial lift, chemicals, and maintenance. This "production maintenance" component provides a more stable revenue base for OFS companies with significant production services exposure. ChampionX (a leading production chemicals and artificial lift company) and Apergy (now part of ChampionX) exemplify this model: their revenue held up better than drilling-focused peers during the 2020 downturn because the producing well base continued to require their products and services regardless of new drilling activity.

    The production services segment also benefits from a secular growth trend: as US shale basins mature and the average well age increases, the need for production optimization, artificial lift, and well intervention grows even if the pace of new drilling slows. This "base maintenance" dynamic creates a long-term tailwind for production-focused OFS companies that is independent of the commodity price cycle.

    Subsea and Offshore Equipment

    For offshore operations, OFS companies provide subsea equipment (wellheads, Christmas trees, manifolds, umbilicals, risers, and flowlines that connect subsea wells to surface production facilities), offshore drilling rigs (jackups for shallow water, semisubmersibles and drillships for deepwater), and related engineering services. Subsea equipment is provided by companies like TechnipFMC, Aker Solutions, and Baker Hughes (through its subsea production systems division). Offshore drilling is conducted by contractors like Transocean, Valaris, Noble Corporation, and Diamond Offshore.

    The offshore OFS market operates on longer cycles than the onshore market: offshore projects take 3-7 years from discovery to first production, and equipment orders are placed years in advance. This longer cycle creates more backlog visibility (and less short-term volatility) but also means that offshore OFS companies face extended downturn periods when new project sanctioning slows.

    The subsea equipment market is particularly important for energy banking because of its high barriers to entry (only a handful of companies globally can manufacture deepwater subsea production systems), long lead times (subsea tree delivery can take 18-24 months from order), and the concentration of investment in a few major deepwater provinces (Guyana, Brazil pre-salt, Gulf of Mexico, West Africa, Norway). The subsea order backlog, tracked by TechnipFMC and Aker Solutions, is a leading indicator of future offshore activity and revenue.

    Digital and Technology Services

    An increasingly important OFS revenue category is digital and technology services: software platforms for reservoir modeling, drilling optimization, production surveillance, and data analytics. SLB's Digital division has crossed $1 billion in annual recurring revenue, and the company's Data Center Solutions business (leveraging oilfield thermal management and power expertise for hyperscaler data center clients) grew 121% year-over-year in 2025. Baker Hughes' Industrial and Energy Technology (IET) segment generates approximately $12 billion in annual revenue from LNG equipment, power generation technology, and industrial services that extend well beyond traditional oilfield applications.

    This technology diversification is strategically significant for energy bankers because it changes the valuation framework: a pure-play OFS company warrants a cyclical multiple (4-7x EBITDA), but the technology and recurring revenue components may warrant higher multiples (8-12x), creating a sum-of-the-parts valuation question similar to the integrated oil company analysis that separates upstream and downstream segments.

    Revenue Model: Activity-Driven with Pricing Leverage

    The OFS revenue model is straightforward: Revenue = Activity Level x Price per Service Unit. Both components are variable:

    Activity level (number of rigs, wells drilled, wells completed, production wells serviced) is determined by E&P capital spending decisions, which are in turn driven by commodity prices. The rig count (for drilling services) and the completion count (for pressure pumping) are the primary activity metrics. When E&P companies increase drilling budgets, they contract additional rigs and frac fleets, increasing OFS demand. When budgets are cut, rigs are released and frac fleets are stacked (idled), reducing demand.

    Price per service unit (dayrates for rigs, price per frac stage, price per day of wireline services) is determined by the supply-demand balance for OFS equipment and crews. When demand is high and equipment is scarce, OFS companies have pricing power and can increase rates. When demand is low and excess capacity exists, prices fall. The pricing cycle lags the activity cycle by several months because OFS companies initially absorb demand changes through utilization (running more or fewer hours per day) before adjusting quoted prices.

    The international OFS market operates somewhat differently from North America. International service contracts tend to be longer-term (2-5 year integrated service agreements rather than short-term well-by-well pricing), providing more revenue visibility. International pricing is generally higher than North American pricing for equivalent services, reflecting the longer mobilization times, higher logistics costs, and regulatory complexity of operating in multiple countries. SLB's 75% international revenue mix and generally higher EBITDA margins (compared to Halliburton's more North-America-weighted mix) partly reflect this international pricing premium.

    The Key Players

    Company2025 Revenue (approx.)Primary SegmentsGeographic Mix
    SLB (Schlumberger)$33-34BDrilling, well construction, production, digital75% international, 25% North America
    Halliburton$22-23BCompletion, production, drilling55% international, 45% North America
    Baker Hughes$27-28BOFS, industrial and energy technology70% international, 30% North America
    Weatherford$5-6BDrilling, completions, productionPrimarily international
    Liberty Energy$3-4BPressure pumping (completions)95%+ North America
    Transocean$3-4BOffshore deepwater drilling100% offshore global
    TechnipFMC$8-9BSubsea equipment, engineeringPrimarily offshore global

    The "Big Three" (SLB, Halliburton, Baker Hughes) are diversified across all service segments and geographies. SLB has the most international exposure and the most diversified service portfolio. Halliburton has the strongest North American completion franchise. Baker Hughes has differentiated through its industrial and energy technology segments (LNG equipment, digital solutions, data center infrastructure), with its non-OFS revenue growing significantly as the company diversifies beyond traditional oilfield services.

    The Cyclicality Challenge

    OFS is the most cyclical energy sub-sector because it sits at the end of the upstream capital spending chain. The transmission mechanism is:

    1

    Commodity Prices Change

    Oil or gas prices rise or fall due to OPEC+ decisions, demand shifts, or geopolitical events.

    2

    E&P Companies Adjust Capital Budgets

    Higher prices lead to increased drilling budgets; lower prices lead to cuts. The adjustment typically happens at the next annual planning cycle or quarterly review (1-3 quarter lag).

    3

    Drilling Activity Changes

    The rig count increases or decreases as E&P companies add or release rigs. Completion activity adjusts similarly.

    4

    OFS Revenue Responds

    OFS companies experience the change in demand for their services, with both volume (number of jobs) and pricing (dayrates, frac fleet pricing) adjusting. The full OFS revenue impact typically lags the initial commodity price change by 2-4 quarters.

    This lagged cyclicality means that OFS companies can report strong results for several quarters after oil prices have already declined (because E&P companies complete their existing drilling programs before cutting), but they also lag the early stages of a recovery (because E&P companies are cautious about ramping activity until they are confident the price improvement is sustainable).

    How OFS Economics Affect Energy Banking

    In E&P financial models, OFS pricing directly affects the drilling and completion costs that determine well-level economics and per-unit capital expenditure. When frac fleet pricing rises by $500,000 per well, the D&C cost for every new well increases by the same amount, which reduces well-level IRRs and affects NAV model outputs. Energy bankers must monitor OFS pricing trends to accurately model E&P capital expenditure.

    In OFS M&A, transactions are driven by consolidation (combining complementary service lines or geographic footprints to achieve scale), technology acquisition (buying proprietary equipment or software), and PE-backed platform building (assembling niche service providers into diversified platforms). OFS M&A is typically priced on EV/EBITDA multiples (4-8x for most OFS segments), but the appropriate multiple depends on the cyclical position: trough EBITDA should be applied with a higher multiple, and peak EBITDA with a lower multiple, to arrive at a normalized valuation.

    In comparable company analysis, OFS companies are compared using revenue per rig, EBITDA margins, return on capital employed (ROCE), backlog (for equipment manufacturers), and free cash flow conversion. The Big Three trade at premium multiples (6-10x EV/EBITDA) reflecting their scale, geographic diversification, and technology differentiation, while smaller, regional service providers trade at discounts (3-6x). Within the Big Three, Baker Hughes' higher multiple partly reflects the market's willingness to value its industrial technology business separately from its cyclical OFS operations.

    In OFS restructuring, the combination of high operating leverage, cyclical revenue, and (in some cases) aggressive debt-funded growth has made OFS one of the most restructuring-prone energy sub-sectors. During the 2015-2016 and 2020 downturns, dozens of OFS companies filed for Chapter 11 bankruptcy, including major names like Weatherford International (pre-restructuring), C&J Energy Services, and Basic Energy Services. The restructuring of overleveraged OFS companies creates advisory mandates for energy banks with restructuring capabilities (Evercore, Lazard, Houlihan Lokey, PJT Partners).

    Interview Questions

    2
    Interview Question #1Easy

    Walk me through the oilfield services business model and explain why OFS is the most cyclical energy sub-sector.

    Oilfield services companies provide the equipment, technology, and manpower that E&P operators need to drill, complete, and produce wells. Major service categories include: drilling services (contract drilling rigs, directional drilling), completion services (hydraulic fracturing, cementing, perforating), production services (artificial lift, well intervention, workovers), and equipment manufacturing (drill bits, downhole tools, subsea systems).

    OFS is the most cyclical sub-sector because:

    1. Derived demand. OFS revenue depends entirely on E&P capital spending. When commodity prices fall, E&P companies immediately cut drilling budgets, and OFS companies lose revenue within 1-2 quarters. There is no contracted revenue floor like midstream.

    2. Operating leverage. OFS companies have high fixed costs (rig fleet maintenance, labor force, equipment depreciation) that cannot be cut as fast as revenue declines. A 30% drop in rig count can cause OFS earnings to decline 50-70%.

    3. Pricing power swings. In upcycles, tight rig and frac fleet availability gives OFS pricing power (dayrates and service pricing can increase 20-50%). In downcycles, overcapacity destroys pricing. Service companies compete aggressively on price to maintain utilization, compressing margins to breakeven or below.

    4. No commodity exposure buffer. Unlike midstream (fee-based contracts), upstream (hedge books), or downstream (spread economics), OFS has no natural hedge against declining activity levels.

    Interview Question #2Easy

    Why are OFS companies typically the first to be affected when oil prices decline?

    OFS companies sit at the end of the capital spending chain and are the first to feel cuts because:

    1. Variable cost treatment. E&P operators treat OFS spending as a variable cost that can be adjusted quickly. When oil prices fall and E&P cash flows decline, the first budget items cut are discretionary drilling and completion spending, which is OFS revenue.

    2. No contractual protection. Unlike midstream companies with take-or-pay contracts, most onshore OFS contracts are short-term or cancellable with minimal penalties. An E&P operator can release a drilling rig with 30-60 days notice.

    3. Rapid transmission mechanism. The sequence is: oil prices fall (week 1), E&P stocks decline and management reassesses budgets (weeks 2-4), capital spending guidance is cut (month 2-3), rigs are released and frac crews are dismissed (month 3-6). OFS feels the impact within one quarter.

    4. Overcapacity dynamics. OFS companies built capacity during the upcycle. When demand drops, excess capacity creates intense price competition. Service companies cut prices to maintain any utilization, further compressing margins.

    The reverse is also true: OFS companies are among the first to benefit when prices recover, as E&P operators reactivate drilling programs and tight equipment availability drives pricing power. This makes OFS the highest-beta play on commodity price direction.

    Explore More

    How to Follow Up After IB Networking Events

    Master the art of following up after investment banking networking events with proven strategies, email templates, and timing guidelines that turn brief conversations into lasting professional relationships.

    November 11, 2025

    How to Prepare for Investment Banking Superday

    Complete guide to acing your IB Superday. Learn what to expect, how to prepare for back-to-back interviews, impress senior bankers, and convert your final round into an offer.

    October 5, 2025

    Questions to Ask Interviewers in Investment Banking Interviews

    Master the questions portion of IB interviews. Learn what to ask analysts, associates, VPs, and MDs to demonstrate interest, gather intel, and stand out positively.

    October 14, 2025

    Ready to Transform Your Interview Prep?

    Join 3,000+ students preparing smarter

    Join 3,000+ students who have downloaded this resource