Pulse test analysis of vertically fractured wells. Final report, February 1, 1976--June 30, 1977
Technical Report
·
OSTI ID:5457232
The orientation of vertical fractures has become a point of serious concern principally due to the implementation of newer and costlier chemical methods of fluid injection to enhance oil recovery. Several methods have been proposed in the literature to determine fracture orientation. These include the use of inflatable impression packers and television cameras, core analysis, geophysical techniques, and pressure transient analysis. The first three methods sample only a small volume of the reservoir and thus do not necessarily reflect conditions at some distance from the wellbore. Pressure transient tests may be used to sample a larger portion of the reservoir volume. Generalized correlations are presented whereby an engineer may easily analyze and/or design pulse tests in fractured wells from pulse tests. The results of the study can be used to obtain the compass orientation of a vertical fracture as well as the degree of reservoir anisotropy by pulse tests provided the formation permeability and fracture half-length are known. These two parameters may be easily obtained from a pressure test at the fractured well by type curve matching. This pressure test may be conducted subsequent to the pulse test or during the pulse test. If the formation permeability is known, then the results may be used to determine fracture half-length and compass orientation. Procedures to obtain the desired results are discussed in an example. The results can also be used to design pulse tests. Conditions necessary to insure that the response obtained is maximum are described. Thus, appropriate instruments, pulse periods, shut-in periods, etc. can be chosen to insure that the test is a success.
- Research Organization:
- Tulsa Univ., Okla. (USA)
- DOE Contract Number:
- EY-76-S-21-8036
- OSTI ID:
- 5457232
- Report Number(s):
- ORO-8036-5
- Country of Publication:
- United States
- Language:
- English
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