Vertical vs. Horizontal Drilling: Which Makes Sense for Your Investment?

How Each Works

A vertical well drills straight down to the target formation. It's the simplest, cheapest approach and has been used since the beginning of the oil industry. You drill through layers of rock until you hit the pay zone, set casing, perforate, and produce.

A horizontal well drills vertically to the target depth, then turns 90 degrees and extends laterally through the formation for 5,000-10,000 feet. This exposes far more reservoir rock to the wellbore, which is why horizontal wells typically produce more oil — but at a much higher cost.

Cost Differences

Vertical wells in the Mid-Continent cost $300,000-$800,000. Horizontal wells run $3-8 million. The cost difference comes from the lateral section, multi-stage fracturing, more casing, and longer drilling time. For an investor with $200,000 to deploy, you could take a working interest in one or two vertical wells, or a smaller interest in one horizontal well.

Production Comparison

Horizontal wells produce more oil in absolute terms. A Woodford Shale horizontal might produce 300-800 barrels per day initially, compared to 20-80 barrels per day from a vertical Mississippian well. But per-dollar-invested, the picture is more nuanced. Vertical wells in proven formations often deliver competitive returns because the entry cost is 5-10× lower.

Decline Rate Differences

Horizontal shale wells decline steeply — 60-75% in the first year is common. Vertical conventional wells decline more gradually — 30-50% in the first year, then settling into single-digit annual decline. Over a 20-year period, the vertical well's cumulative production can be surprisingly competitive with the horizontal well's output per dollar invested.

Risk Profiles

Vertical wells in proven formations carry lower geological risk. You know the formation produces because offset wells have been doing it for decades. Horizontal wells in emerging plays carry more uncertainty — the lateral might encounter unexpected geology, completion design might not optimize production, and the cost of failure is much higher.

When Each Makes Sense

Vertical drilling makes sense in proven conventional formations, where offset well data is abundant, costs are low, and the investor wants diversification across multiple wells. Horizontal drilling makes sense in tight formations (shale, tight sandstone) where you need to contact more rock to achieve economic flow rates.

BassEXP drills both, depending on the geology. We don't force-fit a drilling method — we let the formation dictate the approach.