COMPOSITIONS AND METHODS FOR INHIBITING LOST CIRCULATION DURING WELL OPERATIONS
First Claim
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1. A drilling fluid additive for reducing circulation loss during drilling operations comprising ground pumice, barium or dolomite having an average particle size between 180 and 4000 microns.
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Abstract
Drilling fluid additive compositions are provided for use with synthetic, oil based, or water based drilling fluids. The combined additive and drilling fluid are effective for reducing lost circulation, seepage loss as well as wellbore strengthening and/or wellbore lining. The method includes injecting the drilling fluid and 0.01 or more pounds per barrel of a loss control additive including ground and sized pumice, barite or dolomite.
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Citations
28 Claims
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1. A drilling fluid additive for reducing circulation loss during drilling operations comprising ground pumice, barium or dolomite having an average particle size between 180 and 4000 microns.
- 2. A drilling fluid composition comprising a liquid carrier and a drilling fluid additive including any one of or a combination of ground pumice, barium or dolomite having an average particle size between 180 and 4000 microns.
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17. A method for ameliorating seepage loss while drilling a subterranean well comprising the steps of:
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c. monitoring seepage loss while drilling; d. circulating a synthetic oil, oil, or water based drilling mud into the drill string wherein the drilling fluid comprises a liquid carrier and an additive of ground pumice, barite or dolomite or a combination thereof and wherein the liquid carrier is a synthetic, oil, or water based drilling mud and the additive is added to the liquid carrier at a concentration of greater then 0.01 pounds per barrel of liquid carrier. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of recognizing and controlling an underground blowout in a subterranean formation comprising the steps of:
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e. monitoring surface pressure within a well to detect a pressure increase indicating fluid influx into the well; f. closing in the well in response to the pressure increase; g. monitoring surface pressure and detecting an underground blowout if well pressure drops and fluid loss increases above threshold values; h. circulating a drilling fluid composition comprising a liquid carrier and a drilling fluid additive including any one of or a combination of ground pumice, barium or dolomite having an average particle size between 180 and 4000 microns; and
,i. monitoring the fluid loss and adjusting the size and/or concentration of drilling fluid additive in response to changes or lack of changes in the fluid loss.
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Specification