Borehole trajectory uncertainty and its characterization

LIU Xiushan

Table 3 The evaluation results of sectional error ellipse of borehole trajectory.

Measured depth/m	Error ellipse of horizontal section			Error ellipse of vertical section			Error ellipse of normal section
Measured depth/m	R₁/m	R₂/m	θ/(°)	R₁/m	R₂/m	θ/(°)	R₁/m	R₂/m	θ/(°)
0	0	0	0	0	0	0	0	0	0
900.00	3.17	3.17	0	1.29	3.17	0	3.17	3.17	0
1 800.00	6.40	6.40	0	2.68	6.40	0	6.40	6.40	0
2 700.00	9.62	9.62	0	4.79	9.62	0	9.62	9.62	0
3 600.00	12.85	12.85	0	7.66	12.85	0	12.85	12.85	0
4 500.00	16.08	16.08	0	11.33	16.08	0	16.08	16.08	0
5 400.00	19.30	19.30	0	15.80	19.30	0	19.30	19.30	0
6 300.00	22.53	22.53	0	21.07	22.53	0	22.53	22.53	0
7 200.00	25.76	25.76	0	27.15	25.76	0	25.76	25.76	0
7 660.00	27.41	27.41	0	30.57	27.41	0	27.41	27.41	0
7 831.77	27.97	27.91	-42.30	31.71	27.97	0.11	29.76	27.97	0.02
8 028.73	28.71	28.30	-41.80	32.66	28.71	0.79	30.13	28.71	2.19
8 161.32	29.35	28.45	-39.90	32.99	29.34	1.47	32.99	29.34	1.47
8 400.00	31.00	28.53	-37.46	33.15	30.98	2.77	33.15	30.98	2.77
8 700.00	34.29	28.69	-35.47	33.47	34.28	-9.32	33.47	34.28	-9.32
9 000.00	38.62	28.90	-33.98	34.00	38.56	-2.01	34.00	38.56	-2.01
9 300.00	43.69	29.17	-32.68	34.66	43.58	-1.27	34.66	43.58	-1.27
9 600.00	49.29	29.48	-31.48	35.47	49.09	-1.01	35.47	49.09	-1.01
9 900.00	55.26	29.84	-30.34	36.41	54.94	-0.88	36.41	54.94	-0.88
10 161.32	60.68	30.19	-29.38	37.33	60.22	-0.81	37.33	60.22	-0.81