Patent ID: 9657214
Date: 2017-05-23
CPC Classifications: C09K,E21B

Claim:
1. A method of drilling a well present in a hydrocarbon producing formation, comprising: drilling a hydrocarbon producing carbonate rock formation with a drilling fluid system to form the well in the hydrocarbon producing carbonate rock formation, wherein the drilling forms carbonate rock cuttings which are suspended in the drilling fluid system, contacting a face of the well with the drilling fluid system comprising the carbonate rock cuttings, wherein the drilling fluid system further comprises: wherein during the drilling the emulsion breaks when contacted with the hydrocarbon producing formation to initiate interaction of the aqueous acidic solution and the silicate to form a gel and thereby form an impermeable filter cake layer on the face of the well in the hydrocarbon producing formation, wherein, during the drilling, the concentration of the silicate in the drilling fluid system is effective to form an impermeable filter cake layer on the face of the well and has a silicate concentration of: 5 weight % when the hydrocarbon producing carbonate rock formation has a permeability of between 1 to 100 md, 10 weight % when the hydrocarbon producing carbonate rock formation has a permeability of between 100 to 300 md, or 15 weight % when the hydrocarbon producing carbonate rock formation has a permeability of between 300 to 500 md, wherein the filter cake layer formed on the face of the well in the hydrocarbon producing formation comprises the carbonate rock cuttings, and wherein the filter cake layer is formed only on the face of the well, has a thickness of about 1 mm, and has zero infiltration volume.