730 



Subsurface Geologic Methods 



Well F is also interesting because a large volume of a special treat- 

 ing oil had been pumped into the formation before the Hydrafrac treat- 

 ment. The well was then tested and all the treating oil recovered, but 

 there was no increase in production. The increase in production after the 

 Hydrafrac treatment resulted in bringing the production from 29 BOPD 

 upto200BOPD. 



\ 1 — 



PRESSURE CURVE 



MPtNG GEL a BREAKER FLUID 

 /IN FORMATION 

 Z TRUCKS 



HYDRAFRAC TREATMENT APPLIED MARCH 17.1949 



PRODUCTION: 



INITIAL 660 BOPO 



BEFORE 12 BOPD 



PRESENT 18 BOPO 



Figure 391. Pressure and production curves of a Hydrafrac operation in Daume 

 sand, Strawn formation, Duame field, southwest of Holliday, Texas. Shot on 

 completion with 40 quarts of nitroglycerine, 1945. 



Normally, production increases from a Hydrafrac treatment are 

 maintained for a long period of time. Figure 391 shows the pressure curve 

 recorded during the Hydrafrac job on a well in the Strawn sand located 

 southwest of Holliday, Texas, and the production for one year after 

 treatment. This well was approximately four years old and had been shot 

 on completion. At the time of treatment it was producing 12 BOPD. Im- 



