Gas-liquid converting stable borehole liquid for well drilling as well as preparation method thereof

[0045] A gas-liquid conversion well wall stabilizing fluid for oil industry drilling, consisting of the following components by weight percentage:

[0046] 1.0 # Diesel 30%;

[0047] 2. Polydimethylsiloxane (number average molecular weight is 1000) 10%;

[0048] 3. Didodecyldimethylammonium chloride 10%;

[0049] 4. Sorbitan monoanhydride stearate 5%;

[0050] 5. Rosin modified phenolic resin 15%;

[0051] 6. Petroleum asphalt 5%;

[0052] 7. Polyethylene glycol (number average molecular weight is 5000) 5%;

[0053] 8. Deionized water 20%.

[0054] Technical indicators:

[0055] Apparent viscosity, mPa·s 14.0mPa·s;

[0056] Core linear expansion reduction rate% 95.4%;

[0057] Shale roll recovery % 99.7%.

[0058] The above experiments show that the preflush has good rheological properties and inhibition properties.

[0060] A gas-liquid conversion well wall stabilizing fluid for oil industry drilling, consisting of the following components by weight percentage:

[0061] 1.5 # White oil 45%;

[0062] 2. Polydimethylsiloxane (number average molecular weight 5000) 8%;

[0063] 3. Didodecyldimethylammonium chloride 7%;

[0064] 4. Sorbitan monoanhydride oleate 2%;

[0065] 5. Rosin modified phenolic resin 13%;

[0066] 6. Petroleum asphalt 10%;

[0067] 7. Polyethylene glycol (number average molecular weight 20000) 5%;

[0068] 8. Deionized water 10%.

[0069] Technical indicators:

[0070] Apparent viscosity, mPa·s 12.0mPa·s;

[0071] Core linear expansion reduction rate% 94.8%;

[0072] Shale roll recovery % 99.2%.

[0073] The above experiments show that the preflush has good rheological properties and inhibition properties.

[0075] A gas-liquid conversion well wall protection agent for oil industry drilling, consisting of the following components by weight percentage:

[0076] 1.5 # White oil 60%;

[0077] 2. Polydimethylsiloxane (number average molecular weight 3000) 3%;

[0078] 3. Dihexadecyldimethyl ammonium chloride 5%;

[0079] 4. Sorbitan monoanhydride oleate 2%;

[0080] 5. Rosin modified phenolic resin 10%;

[0081] 6. Petroleum asphalt 5%;

[0082] 7. Polyethylene glycol (number average molecular weight 10000) 10%;

[0083] 8. Deionized water 5%.

[0084] Technical indicators:

[0085] Apparent viscosity, mPa·s 10.0mPa·s;

[0086] Core linear expansion reduction rate% 94.2%;

[0087] Shale Roll Recovery % 98.9%.

[0088] The above experiments show that the preflush has good rheological properties and inhibition properties.