The Rheology and Performance of Geothermal Spring Water-Based Drilling Fluids

Table 2

Rheological properties of drilling mud samples.

Samples	S1	S2	S3	S4	D1
Apparent viscosity (AV) mPas at 150 psi
Amb. con	17.305	11.180	19.700	18.900	22.895
77°F	19.265	11.095	20.535	19.747	23.535
122°F	16.154	8.315	17.298	16.209	21.910
167°F	14.422	6.604	15.948	14.874	20.675
212°F	13.153	5.490	15.506	14.267	20.008
257°F	9.881	3.648	12.465	11.748	16.354
302°F	6.735	1.867	8.551	8.260	12.526
Plastic viscosity (PV) mPas at 150 psi
Amb. con.	9.590	6.920	10.650	10.650	10.650
77°F	13.404	7.887	14.097	13.748	14.602
122°F	10.602	4.489	11.609	11.073	13.004
167°F	8.847	4.838	9.763	9.312	11.411
212°F	8.870	4.253	11.401	10.588	12.625
257°F	8.129	3.690	10.068	9.640	11.060
302°F	4.877	2.282	6.707	6.464	8.079
Yield point (YP) Pa at 150 psi
Amb. con.	7.884	4.353	9.249	8.431	12.514
77°F	5.985	3.279	6.578	6.130	9.129
122°F	5.673	4.248	5.813	5.247	9.100
167°F	5.697	1.804	6.320	5.683	9.467
212°F	4.376	1.264	4.194	3.758	7.543
257°F	1.789	-0.04	2.449	2.153	5.410
302°F	1.897	-0.41	1.884	1.835	4.543
YP/PV Pa/mPas at 150 psi
Amb. con.	0.822	0.629	0.868	0.791	1.175
77°F	0.446	0.415	0.466	0.445	0.625
122°F	0.535	0.946	0.500	0.473	0.699
167°F	0.643	0.372	0.647	0.610	0.829
212°F	0.493	0.297	0.367	0.354	0.597
257°F	0.220	−0.01	0.243	0.223	0.489
302°F	0.388	−0.41	0.280	0.283	0.562