The crosslinked high strength hydrochloric acid system1 has led to significant production increases in Rocky Mountain wells. A total of sixty five wells have been stimulated with this system utilizing a total of over 470,000 gallons of crosslinked hydrochloric acid in concentrations ranging from 3% to 28%. Old producers as well as the newly drilled wells completed in the various formations such as, Dakota, Mission Canyon, Phosphoria, Minnelusa, Green River, Uintah, Nesson Midale, Red River etc. were treated. The bottom hole temperatures of these wells ranged between 110°F and 260°F (43°C to 126.7°C). The cumulative oil production from the sixty five wells prior to the crosslinked acid jobs has totaled to over 2,300 BOPD. After the crosslinked acid jobs the cumulative oil production has increased to over 8,400 BOPD, which is more than three fold increase in oil production. In a few individual wells oil production has increased by as low as 1–5 BOPD, whereas in some individual wells the production has increased by as high as 1,300 BOPD. One of the old oil producers in the Green River Formation, Utah, was producing 40 BOPD but after a treatment, the production increased to 200 BOPD and a sustained oil production after 90 days was 150 BOPD. Similarly, Production has increased from 16 BOPD to 216 BOPD in one of the new completions in the Dakota Formation in Wyoming.

The treatments have been successful in old and new oil wells as well as in a water injection well. Wells have been successfully treated using sand as proppant, and carbon dioxide or nitrogen in the system. The crosslinked acid system has shown success in wells where conventional acid treatments have provided marginal success or failed. Several case histories of the crosslinked acid system have been presented in recent presentations.2 

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