Lesley.] 



354 



[Dec. 15, 



Colorado Well, No. 11. 



Janu;iry2(Jth, 1S72. 



Level of well mouth above ocean*. 

 Wooden conductor to rock 



IstS.S 



? 



2dS. S 



? 



3dS. S 



? pocket. 



Drilled dry. Cased at 392^ feet. 



3d sand good in every part, particularly so between 662 feet and 670 feet. 



Natural production 190 barrels daily for five days. Decreased rapidly to 

 130 barrels, and then more gradually until Sept. 11th, 1872, when it was 

 pumping only 8 barrels. At this time a 3 pint torpedo was put in. 18 feet 

 below the top of the 3d S. S., resulting in a daily production of 150 barrels 

 for three days. It declined rapidly. On Sept. 21st, it had fallen to 24 bar- 

 rels per day, and on Jan. 1st, 1873, to 4 barrels per day. A 3 pint torpedo 

 was then used 12 feet in the sand, and the yield was thus brought up to 

 15 barrels per day for a short time. 



Then commenced another rapid decline carrying the production down to 

 3 barrels per day by the 6th of May following, when another torpedo was 

 inserted, resulting in a slight increase of oil. 



On June 24th, 1873, while pumping 4 barrels per day, an attempt was 

 made to fill up the well by putting oil and water in at the top. After 275 

 pails full had been poured in, it was ascertained that it had only filled up 

 the bottom of the 5J^ inch well hole 25 feet. 



Colorado Well, No. 12. 

 March, 1872. 



Level of well mouth above ocean* 1325 



Drive pipe to rock 57 feet. 57 — 1268 



? 198 to 255 = 1070 



IstS.S 40 •' 295 == 1030 



9 90 " 385 = 940 



2dS. S 12 " 397 = 928 



• ? 87 " 484 = 841 



3dS. S 48 " 532 = 793 



9 pocket. 13 " 545 =^ 780 



Drilled dry. Cased at 220 feet. 

 * oil city Depot provisionally 995' + V. H. 11. datum. 



