This paper describes the evolution from small treatments pumped with 20/40 sand to a variety of treatment sizes with larger CarboLite proppant. These design changes were shown to more than double the post-frac productivity of the wells. The authors state: “The permeability of the proppant pack is one of the most important factors governing the final conductivity of the fracture...evaluation of a proppant needs to be made in terms of cost per millidarcy, not cost per pound.”
Sixty-five percent of the reserves of the Kuparuk River field, the second-largest producing oil field in the U.S., is contained in a 20- to 80-md-permeability sandstone. This paper provides details of stimulation design advances made over the past provides details of stimulation design advances made over the past 3 years in this formation. The design steps for optimizing fracture treatments in a moderate-permeability formation require primary emphasis on fracture conductivity rather than on treatment primary emphasis on fracture conductivity rather than on treatment size or fracture length. This philosophy was used for the 140 new wells documented in this paper. Treatment size was gradually increased once a commensurate increase in fracture conductivity was obtained. Applying the new design to the refracturing of 88 producing wells in the field resulted in an incremental 40,000 producing wells in the field resulted in an incremental 40,000 BOPD, a significant portion of the field's 300,000 BOPD.
Author(s): Inc., C.M. Pearson, A.J. Bond, M.E. Eck, K.W. Lynch, Arco Alaska
Paper Number: SPE 20707