Article

Petroleum Science

, Volume 8, Issue 1, pp 87-92

First online:

An experimental study of fracture initiation mechanisms during hydraulic fracturing

  • Tie YanAffiliated withKey Laboratory of Enhanced Oil & Gas Recovery, Ministry of Education, Northeast Petroleum University Email author 
  • , Wei LiAffiliated withKey Laboratory of Enhanced Oil & Gas Recovery, Ministry of Education, Northeast Petroleum University
  • , Xueliang BiAffiliated withKey Laboratory of Enhanced Oil & Gas Recovery, Ministry of Education, Northeast Petroleum University

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

The mechanism of fracture initiation is the basic issue for hydraulic fracture technology. Because of the huge differences in fracture initiation mechanisms for different reservoirs, some successful fracturing techniques applied to porosity reservoirs are ineffectual for fractured reservoirs. Laboratory tests using a process simulation device were performed to confirm the characteristics of fracture initiation and propagation in different reservoirs. The influences of crustal stress field, confining pressure, and natural fractures on the fracture initiation and propagation are discussed. Experimental results demonstrate that stress concentration around the hole would significantly increase the fracture pressure of the rock. At the same time, natural fractures in the borehole wall would eliminate the stress concentration, which leads to a decrease in the fracture initiation pressure.

Key words

Hydraulic fracturing porosity reservoir fractured reservoir fracture initiation fracture propagation simulation experiment