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Desk Focus 07 · Unit & Allocation Well Math

Pooled Unit & Allocation Well Decimal Mentorship.

Horizontal laterals routinely cross multiple tracts, older vertical units, and unpooled leases. Work one-on-one with a mentor on how to calculate tract participation factors, allocation well lateral-foot ratios, and retained-acreage severances without losing eighth-decimal precision.

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Sample unit worksheet · 640-ac unit + 2-unit allocation lateral. Generic tracts, not a real well.

White chalk: the worksheet as built. Yellow chalk: a mentor's notes.

No. Instr. Grantor Grantee Dated / Filed Bk/Pg Land and remarks Mentor's notes
1 DPU Tract 1 (NW/4) Unit A (640 ac) Dated 01/15/2020Filed 01/22/2020 Bk/Pg 410/8 160.00 gross ac; Owner holds 1/4 MI (40 NMA) under 1/5 royalty lease.

Tract 1 unit factor = 160 / 640 = 0.25000000. Owner unit NRI = (40 / 160) x 0.20 x 0.25000000 = 0.01250000.
2 PSA Well #1H Lateral Units A & B Dated 08/10/2023Filed 09/02/2023 Bk/Pg 512/4 9,600 ft productive lateral: 6,000 ft in Unit A, 3,600 ft in Unit B.

Unit A allocation factor = 6,000 / 9,600 = 0.62500000. Owner wellbore NRI = 0.01250000 x 0.62500000 = 0.00781250.
3 OGL Tract 2 Lease Outside Acreage Dated 05/01/2018Filed 05/09/2018 Bk/Pg 390/12 Vertical & horizontal Pugh clause after primary term: 100 ft below deepest perf.

Verify completion report TVD and proration plat; log severed outside acreage and deeper benches on a separate open-acreage line.

What we work through on unit and allocation well schedules

  1. Pooled unit tract factors vs. non-pooled NPRI tracts.

    How a pooling designation blends leased mineral interests by surface-acre ratio while unratified non-participating royalty interests (NPRIs) and non-consenting cotenants must be tracked on a drillsite-tract or lateral-penetration basis.

  2. Allocation wells vs. Production Sharing Agreements (PSAs).

    Comparing productive lateral length between first and last take points (FTP/LTP) against PSA allocation formulas and checking which leases require a signed PSA or pooling amendment.

  3. Horizontal and vertical Pugh clause triggers.

    Reading exact retained-acreage wording ("producing interval," "stratigraphic equivalent," "100 feet below deepest perforation," or "governmental proration unit") and matching it to completion reports.

  4. Balancing the unit deck to 1.00000000.

    Checking that working-interest, lessor-royalty, NPRI, and overriding-royalty columns sum cleanly across every tract before handing the schedule to counsel or division orders.

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