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- W1983766207 abstract "Abstract Water-based fluids have been used to drill various wells in Saudi Aramco fields. A typical water-based mud consists of xanthan, starch or cellulose polymers, plus bridging agents like sized calcium carbonate or salt particles. The polymers in the drill-in fluids are needed to build the required viscosity to transport cuttings and form a filter cake around the wellbore to reduce the fluid loss. Some of these polymers invade the critical near wellbore area and may cause formation damage. One of the treated wells was the first multi-lateral ever drilled in a deep sandstone gas reservoir in Saudi Arabia. The dual-lateral well was completed with a pre-drilled liner completion. Mineral and organic acids can be used to remove the filer cake, but they cannot be applied in horizontal and multilateral wells without using an effective diversion technique. In addition, the sandstone formation in this case is acid-sensitive. As a result, a filter cake cleanup process was performed separately in each lateral, using a completion brine wash followed by a specific enzyme treatment. Several lab studies were conducted using field mud samples to determine the cleaning efficiency of enzymes used to remove damage which occurred while drilling the target zone. For the first time, an enzyme solution was spotted in one lateral and left in the hole for more than four months, until the second lateral was drilled and the well was ready for testing. Various tests were conducted on well flowback samples after the enzyme treatments. These tests included: chemical analysis of the aqueous phase and full analysis of the produced solids using acid solubility, sieve analysis, XRD, XRF, and SEM. In addition, the carbohydrates content in the aqueous phase was measured using the anthrone method. A significant improvement in gas production from this well has been realized through the application of the enzyme treatment for the removal of starch and XC polymers used in drilling operations. This paper will discuss in detail laboratory work that was conducted to assess this field treatment." @default.
- W1983766207 created "2016-06-24" @default.
- W1983766207 creator A5079853703 @default.
- W1983766207 date "2005-06-13" @default.
- W1983766207 modified "2023-10-18" @default.
- W1983766207 title "Chemical Treatments for Removal of Drill-in-Fluid Damage in Horizontal-Multilateral Gas Wells: Lab Studies and Case Histories" @default.
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- W1983766207 doi "https://doi.org/10.2118/94043-ms" @default.
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