The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 08, 1991
Filed:
Jul. 13, 1990
Applicant:
Inventor:
C Mark Pearson, Anchorage, AK (US);
Assignee:
Atlantic Richfield Company, Los Angeles, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166280 ; 166308 ;
Abstract
Hydraulic fracturing of earth formations from wells for producing gas or hydrocarbon liquids is carried out by extending the fracture to a predetermined length with clean or low proppant concentration fluids, then decreasing the rate of injection with low proppant concentration fluids to equal the fluid leakoff rate until the fracture tip is blocked or screened out. Alternatively, the proppant concentration could be progressively increased until tip screenout occurs. Injection rates are then increased, particularly in high permeability formations, to increase the fracture width.