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Title: Overbalance perforating and stimulation method for wells

This patent describes a method for decreasing the resistance to fluid flow in a subterranean formation around a well having unpreforated casing fixed therein, the casing extending at least partially through the formation. It comprises providing a liquid in the casing opposite the formation to be treated; placing perforating means in the casing at a depth opposite the formation to be treated; injecting gas into the well until the pressure in the liquid opposite the formation to be treated will be at least as large as the fracturing pressure of the formation when the liquid pressure is applied to the formation; activating the perforating means; and at a time before pressure in the well at the depth of the formation to be treated has substantially decreased, injecting fluid at an effective rate to fracture the formation.
Authors:
; ;
Publication Date:
OSTI Identifier:
7106618
Report Number(s):
US 5131472; A
PPN: US 7-699987
Resource Type:
Patent
Resource Relation:
Patent File Date: 13 May 1991
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; OIL WELLS; GAS INJECTION; WELL STIMULATION; WELL DRILLING; FLUID INJECTION PROCESSES; FLUID FLOW; PERFORATION; TECHNOLOGY ASSESSMENT; WELL CASINGS; DRILLING; FLUID INJECTION; STIMULATION; WELLS 020300* -- Petroleum-- Drilling & Production