Determining Triaxial Stress Sensitivity of Oil Reservoir Rocks without Fluid Flooding

Table 3

Data of porosity and permeability damage rate under different confining stress.

Confining stress (MPa)	Axial stress (MPa)	Dimensionless porosity	Dimensionless permeability	Absolute value of permeability reduction (mD)	Absolute value porosity reduction	Porosity damage rate	Permeability damage rate
2	2	0.9811	0.9627	8.59-04	8.02-04	1.89%	3.73%
4	4	0.9705	0.9421	1.33-03	1.25-03	2.95%	5.79%
6	6	0.9623	0.9261	1.70-03	1.60-03	3.77%	7.39%
8	8	0.9550	0.9121	2.02-03	1.91-03	4.50%	8.79%
10	10	0.9482	0.8991	2.32-03	2.20-03	5.18%	10.09%
13	13	0.9387	0.8812	2.74-03	2.61-03	6.13%	11.88%
16	16	0.9296	0.8642	3.13-03	2.99-03	7.04%	13.58%
19	19	0.9203	0.8471	3.52-03	3.39-03	7.97%	15.29%
22	22	0.9120	0.8318	3.87-03	3.74-03	8.80%	16.82%
25	25	0.9137	0.8349	3.80-03	3.67-03	8.63%	16.51%
30	30	0.8847	0.7828	5.00-03	4.90-03	11.53%	21.72%
35	35	0.8732	0.7626	5.47-03	5.39-03	12.68%	23.74%
40	40	0.8623	0.7436	5.91-03	5.85-03	13.77%	25.64%
45	45	0.8511	0.7245	6.35-03	6.33-03	14.89%	27.55%
50	50	0.8408	0.7071	6.75E-03	6.76-03	15.92%	29.29%
55	55	0.8335	0.6949	7.03-03	7.07-03	16.65%	30.51%
60	60	0.8221	0.6759	7.47-03	7.56-03	17.79%	32.41%
65	65	0.8124	0.6601	7.83-03	7.97-03	18.76%	33.99%