| Autor: |
Jerry R. Trythall, Michael A. Martin, John W. Ely, Jose J. Duenas |
| Rok vydání: |
2003 |
| Předmět: |
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| Zdroj: |
All Days. |
| DOI: |
10.2118/80913-ms |
| Popis: |
The Hugoton /Brown Dolomite fields have been on production for well over 50 years and are presently producing at very low bottom hole pressures. Early in 2001 a fairly comprehensive study was made evaluating completion procedures with a large emphasis on ways to minimize cost and maximize production. In the study it was determined that virtually every fracturing fluid in the known world had been used in the formation. Additionally there appeared to be little difference in results based upon type of fluid, volume of fluid and proppant and or size of proppant. Based upon the premise that the majority of the production was coming from natural fractures and that there was little chance of achieving high relative conductivities between these natural fractures and created fractures, a step change was introduced by using smaller proppant. This smaller proppant used in conjunction with fresh water only, would enter and hold natural fractures open. The technique is based upon success in other naturally fractured reservoirs using the "Waterfrac technique". The technique is extremely simplistic using water with 40/70 sand only in the shallower Texas Panhandle wells with 5.5" casing and water with friction reducer and 40/70 proppant in the slightly deeper Hugoton Kansas wells with 4.5" casing. Early concerns related to watering out or drowning the very low-pressure zones but capillary imbibition allows all of the water to be absorbed by the formation and little or no frac fluid is produced. There are differences in completion techniques between Kansas Hugoton and Texas Panhandle Brown Dolomite relating to open hole versus cased wells and formation water production and these will be discussed separately in the paper. A large part of the paper will be spent comparing production of these wells with more conventionally completed wells, using large proppant and crosslinked foam fluids. Additionally a review of the success achieved utilizing under balanced horizontal wells is compared to the waterfrac vertical completions. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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