1876.] 



355 



[Lesley. 



Best part of oil sand from 492 feet to 504 feet. Oil came in while run- 

 ning tlie second "bit" after the 3d sand was struck.* 



Natural production 80 barrels per day, when first struck, declining slowly 

 to 7 barrels by the 20th of August, 1872, when a 3 pint torpedo was put in 

 10 feet below the top of 3d sand. The result was an increase to 60 barrels 

 the first 24 hours and a rapid decline to 10 baiTels in 30 days. For two or 

 three months after this it pumped steadily 10 barrels per day, and then 

 began to decline. On May 24th, 1873, it was yielding only 3 barrels 

 per day. Another torpedo was now exploded at a point 14|^ feet below the 

 top of the 3d S. S., bringing the production up to 30 barrels per day for 

 two days, followed by a gradual decline to 10 barrels at the end of 30 days. 



Colorado Well, No. 13. 

 July 20th, 1872. 



Level of well mouth above ocean 



Wooden conductor to I'ock 



? 



IstS. S 



? 



2dS. S 



? 



3dS. S 



Sand and slate alternating 



Slate. 



While drilling in 



Drilled dry. Cased at 205 feet. 



Best sand from 3 to 8 feet below the top of 3d S. S 

 this the well filled up rapidly. 



Natural production 3 barrels per day. July 26th, exploded a 3 pint tor- 

 pedo 5 feet below top of 3d S. S., causing but little improvement in pro- 

 duction. 



Aug. 2d, 1872, exploded another 3 pint torpedo one foot higher in the 

 sand. Increase slight. Five days after torpedoing the well was producing 

 5 barrels. 



Colorado Well, No. 14. 

 August 1st, 1872. 



Level of well mouth above ocean 



Wooden conductor to rock 



? 



IstS.S 



? 



15 feet. 15 = 



372 to 387 = 



23 " 410 = 



106 " 516 = 



* A "bit" Is the technical term applied to the chisel-shape tool used in drill- 

 ing before the "reamer" or finishing tool is introduced. It is seldom "run " 

 more than three feet without being withdrawn for sharpening. Oil struck 

 "while running the second bit" means, therefore, that it was from three to five 

 feet below the top of the sand rock. 



