Example 8.2 Constant Pressure Operation

Let us rework Example 8.1 assuming the same pipe sizes, etc., and a depth of 6000 ft. This time we will let Apt = 2000 psig and q vary, according to our recent discussion. Immediately we see that Apx = 700, and Apb = 1300 psig.


To determine K i we must consider both the drill pipe and drill collar section.

It can be shown (see Problem 6b) that

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