| 摘要 |
THE PRESENT INVENTION RELATES TO A METHOD AND TO A FLUID FOR DRILLING OR WORKOVER IN A WELL RUNNING THROUGH A POROUS PERMEABLE FORMATION, WHEREIN A WATER-BASED WELL FLUID CIRCULATES IN SAID WELL. IN THE METHOD, AT MOST 3% BY WEIGHT OF A COMPOSITION OBTAINED FROM FAT, OR AN OIL, AND AN ALCOHOL, IS ADDED TO THE FLUID IN ADDITION TO THE CONVENTIONAL CONSTITUENTS FOR SUCH A FLUID, THE CHAIN LENGTHS OF THE ACID AND ALCOHOL PARTS BEING CHOSEN SUCH THAT THE ESTER THUS OBTAINED HAS SUFFICIENT DISPERSION IN WATER, COMPATIBILITY WITH SAID CONSTITUENTS, DOES NOT FORM AN EMULSION WITH THE RESERVOIR OIL AND ADSORBS SUFFICIENTLY ON THE POROUS FORMATION.
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