The Vogel Correlation to Construct an IPR Curve - Engineering Assignment Help

Assignment Task

Q1 A vertical well has been drilled to 5000ft and encountered a 40API oil at a reservoir pressure of 2500psia. A drill stem test (DST) flowed 2000 STB/D with a FBHP of 1500psia. The FTHP during this DST was maintained at 250psia. At the surface, a gas liberation analysis indicated that the bubble point pressure of the oil was at 2500psia, the same as the reservoir pressure. The well did not produce any water, and the GOR was measured to be 600 cuft/bbl.

a.  With this information, use the Vogel correlation to construct an IPR curve

b.  The well was then completed with 2.875” tubing, and an isochronal test was performed with the data shown below. Using this data, construct a better approximation of the IPR curve and plot the result in the same graph section as Q1a

Q2 The outflow from the operating point conditions in Q1 (you may assume ???????? = 1100 ????????????????????????/????????) are conveniently (and crudely) separated into oil and gas pipelines in a separator located at the well head. From here, horizontal pipelines flowing liquid oil and gas span 5km equivalent in terms of frictional losses over smooth pipes measuring 12” in diameter. a. (8 marks) Assuming the wellhead pressure is 750psia what is the pressure of the liquid pipeline at the entrance to the separation facility? The oil viscosity is 4cp. Comment on the magnitude of this pressure loss. b. (9 marks) Later in the development of this field, an additional pipeline from another well is linked to this initial pipeline. The second wellhead is situated at a 100m lower elevation, and the FTHP of this second well is lower, at 250psia. The pipe used is also 12” and you may assume zero frictional losses, and the oil produced is the same. In order to mix the 2 pipelines together with a Y-junction, a pump must be installed to raise and pressurise the second pipeline to at least 750psia. If the flowrate from the second well is 2000STB/D, how much power does this pump require if it has a 70% efficiency?

c.  A few major simplifications were made in this question to allow it to be solved reasonably on paper.

a. What is one such simplification?

b. What makes the physical reality more challenging to solve?

c. What are some ways of solving the real case?

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