Borehole trajectory uncertainty and its characterization

LIU Xiushan

Table 2 The evaluation results of error ellipsoid and error ellipsoid cylinder of borehole trajectory.

Measured depth/m	Error ellipsoid						Error ellipsoid cylinder
Measured depth/m	R₁/m	R₂/m	R₃/m	α_W/(°)	?_W/(°)	θ_W/(°)	R₁/m	R₂/m	θ/(°)
0	0	0	0	0	0	0	0	0	0
900.00	3.17	3.17	1.29	0	0	0	3.17	3.17	0
1 800.00	6.40	6.40	2.68	0	0	0	6.40	6.40	0
2 700.00	9.62	9.62	4.79	0	0	0	9.62	9.62	0
3 600.00	12.85	12.85	7.66	0	0	0	12.85	12.85	0
4 500.00	16.08	16.08	11.33	0	0	0	16.08	16.08	0
5 400.00	19.30	19.30	15.80	0	0	0	19.30	19.30	0
6 300.00	22.53	22.53	21.07	0	0	0	22.53	22.53	0
7 200.00	25.76	25.76	27.15	0	0	0	25.76	25.76	0
7 660.00	27.41	27.41	30.57	0	0	0	27.41	27.41	0
7 831.77	27.90	27.97	31.72	2.41	38.37	8.40	16.13	27.98	-0.55
8 028.73	28.24	28.71	32.71	6.36	44.26	3.48	16.54	28.85	-4.01
8 161.32	28.32	29.35	33.10	9.10	47.70	2.13	32.25	28.17	34.85
8 400.00	28.20	31.00	33.43	13.97	51.33	1.10	27.38	33.37	-35.10
8 700.00	28.03	34.29	34.06	18.53	53.02	1.44	26.69	36.17	-21.83
9 000.00	27.86	38.62	34.87	21.55	55.25	0.76	26.70	40.23	-15.36
9 300.00	27.74	43.69	35.82	23.44	56.65	0.68	27.13	44.87	-10.80
9 600.00	27.68	49.29	36.89	24.55	57.90	0.64	27.85	49.91	-7.46
9 900.00	27.70	55.26	38.07	25.13	59.07	0.61	28.80	55.17	-4.85
10 161.32	27.78	60.68	39.16	25.33	60.05	0.60	29.78	59.81	-2.95