Table T1. Chart used to calculate (1) travel time for PFT to drill bit based on mud pumping rate and length of drill string, and (2) HPLC pumping rate to maintain an ~1 mg/L PFT solution in the drill string.

Strokes* (min-1)	Liter (min-1)	HPLC Pump (mL min-1)	Time of PFT to drill bit with pipe length (m)
			5900 (min)	6000 (min)	6100 (min)	6200 (min)	6300 (min)
5	98	0.05	602	612	622	633	643
10	196	0.11	301	306	311	316	321
15	294	0.16	201	204	207	211	214
20	392	0.22	151	153	156	158	161
25	490	0.27	120	122	124	127	129
30	588	0.33	100	102	104	105	107
35	686	0.38	86	87	89	90	92
40	784	0.44	75	77	78	79	80
45	882	0.49	67	68	69	70	71
50	980	0.54	60	61	62	63	64
55	1078	0.60	55	56	57	58	58
60	1176	0.65	50	51	52	53	54
65	1274	0.71	46	47	48	49	49
70	1372	0.76	43	44	44	45	46
75	1470	0.82	40	41	41	42	43
80	1568	0.87	38	38	39	40	40
85	1666	0.93	35	36	37	37	38
90	1764	0.98	33	34	35	35	36
95	1862	1.03	32	32	33	33	34
100	1960	1.09	30	31	31	32	32

Notes: PFT = perfluorocarbon tracer; HPLC = high pressure liquid chromatography; ppm = parts per million. * = mud pump strokes were recorded on the rig floor. 1 stroke = 19.6 L.