Alternate stages of pad fluid and acid provide improved leakoff control for fracture acidizing
Improvements in leakoff control in deep penetrating fractures have been accomplished by the use of viscous, nonreactive fluids and viscous, non-reactive fluids containing fine sand when used in alternate stages with acid. Macro examination of hairline fracture vugs and large pores and examination under the scanning electron microscope coupled with laboratory fluid loss data explain how the pad fluid and pad fluid containing fine sand can control fluid leakoff. Another facet of this investigation has been a study and analysis of pressure variations during fracture treatments. This contributes further evidence of the influence of a leakoff control mechanism. These data, although possibly subject to different interpretation, can be shown to confirm the premise of leakoff control by inert pads sandwiched between stages of acid while acid fracturing.
- OSTI ID:
- 7309567
- Report Number(s):
- CONF-761008-79
- Country of Publication:
- United States
- Language:
- English
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