Subtle Depletion

Last month we looked at:

1. How to recognize obvious depletion from DST's.

2. A case history where the operator ignored the signs of depletion on the test and completed the well with disastrous results!

This month we feature more subtle depletion with a quiz game.

Two Examples

EXAMPLE A is a gas test showing some signs of possible depletion.

You are asked to imagine this is your own well: Would you abandon it?

- or run casing?

- or retest? 

EXAMPLE B is an oil zone which has some depletion but the operator completed it anyway. You are asked to guess the results.

Most accurate answer will receive half-price admission to Hugh Reid's next DST or Hydrodynamics course or a rebate on a month of AccuMap/CHD subscription -- your choice. (Former students of Hugh's DST course who may have the solutions are kindly requested to refrain from entering.)

Next month: We feature some mechanical problems which can mimic depletion

 i.e., FALSE DEPLETION.

Meanwhile, cruise through AccuMap's DST module to practice finding other depleting charts which would indicate small reservoirs to avoid.

Example A: Gas Zone

Example A: Quiz 

Imagine this is your well.

1. Do you believe it is really depleting? (Is some of the evidence not clear cut?)

2. What would you do if you owned this well?

a. Abandon

b. Complete

c. Retest (with what differences in test procedure?)

d. Farmout

Example B: Oil Zone

DST 1 (Suspected Depletion - First Test Over Zone)

DST 2 (Retest of Same Interval as DST above)

Example B: Quiz 

1. Can you identify three (3) signs of depletion?

2. Despite the DST evidence, the operator completed, the well. Can you guess:

a. How long it lasted?

b. Cumulative oil produced?

c. Final production rate?