Case Study 1 - Solutions

# Case Study 1 - Solutions - CASE 1 In this case study a well...

This preview shows pages 1–4. Sign up to view the full content.

1 CASE 1 In this case study a well is producing at a constant rate of 1500 stb/d for a period of 100 hrs. This represents a drawdown well test, with the following general data provided: The pressure recordings are shown in the table below: A plot of flowing well pressure versus time is shown below (lin-lin). Note the first point is omitted for the purpose of clarity. A second plot of flowing pressure versus log of time is shown below(log-lin):

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 From adding a line to the straight line region in the semi log plot we can see the pressure starts to veer from linear behavior (on a log scale) at time equal to 4.25 hrs. Therefore from the data we can say that the infinitely acting stage occurs from 1 hr (our first known point) to 4.25 hours, since infinitely acting behavior will appear as a straight line on a semi-log plot. From adding a line to the straight line region in the normal Cartesian plot we can see the pressure starts to veer from linear behavior at time equal to 30 hrs. Therefore from the data we can say that semi-steady state flow occurs from 30 hrs to 100 hours (our last data point), since semi-steady state behavior will act linearly on a lin-lin plot. 2300 2400 2500 2600 2700 2800 2900 3000 1 10 100 Pressure (psia) Log time Case Study 1
3 Note that in between 4.25 hrs and 30 hours we have a transition from infinitely acting flow to semi-steady state flow. The slope in the transient region of the semi-log plot can be used to determine the reservoir permeability, as follows:

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern