Wellbore Stability Evaluation for Horizontal Hole Completion - A Case Study

T. Finkbeiner, D. Moos, W. DeRose, D. Shiflett

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Scopus citations

Abstract

Understanding borehole stability has become increasingly important in recent years to facilitate design of costly horizontal wells. This paper presents a case study, in which we evaluated the stability of a horizontal well in a major California oil field by first determining rock strength and tectonic stress and then drilling the well to verify the results of the predictions. Given the opportunity to drill numerous horizontal and possibly multilateral wells, it was important to fully evaluate the possibility of a successful open hole completion. An 800-foot horizontal well was planned to be drilled within a poorly consolidated and highly porous Pliocene reservoir that is slightly over pressured. The analysis revealed that one horizontal principal stress is greater and one is lower than the overburden. Maximum horizontal compression is oriented N60°E. Borehole stability of the horizontal well is predominantly controlled by the extremely weak reservoir rock (uniaxial compressive strength is only 1, 175 psi). An open hole completion was predicted to collapse without supporting slotted liner or casing. Even for a cased well, perforations placed at their most stable orientation were predicted to produce considerable amounts of sand. Only 200 feet of open horizontal hole was tested to validate the prediction. The open hole produced briefly and then collapsed. The horizontal well was subsequently completed in 800 feet of interval using a 60 mesh slotted liner and has produced 15, 657 bbls of oil, 291 bbls of water, and 41, 181 Mcf of gas through 12/31/99 with no sand problems.

Original languageEnglish (US)
Title of host publicationProceedings - SPE Asia Pacific Oil and Gas Conference and Exhibition, Winning Technology and Teamwork, APOGCE 2000
Pages503-514
Number of pages12
StatePublished - 2000
Externally publishedYes
EventProceedings - SPE Asia Pacific Oil and Gas Conference and Exhibition, Winning Technology and Teamwork, APOGCE 2000 - Brisbane, QLD, Australia
Duration: Oct 16 2000Oct 18 2000

Other

OtherProceedings - SPE Asia Pacific Oil and Gas Conference and Exhibition, Winning Technology and Teamwork, APOGCE 2000
CountryAustralia
CityBrisbane, QLD
Period10/16/0010/18/00

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

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