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:
Nov. 03, 2020
Filed:
Jun. 16, 2017
Welltec A/s, Allerød, DK;
Christian Krüger, Allerød, DK;
Welltec A/S, Allerød, DK;
Abstract
The present invention relates to a fracturing method for providing fractures in a formation downhole for optimising hydro-carbon production, such as gas or shale gas production, in a well having a well tubular metal structure comprising several self-closing flow assemblies, each self-closing flow assembly comprising a sleeve which is movable along a longitudinal axis of the well tubular metal structure for opening or closing a port in the well tubular metal structure. The method comprises providing fracturing fluid derived from in situ hydro-carbons; submerging an activation device into the well tubular metal structure; pressurising the well tubular metal structure by means of the fracturing fluid derived from in situ hydro-carbons for moving the activation device towards a first self-closing flow assembly; engaging the sleeve of the first self-closing flow assembly by means of the activation device; further pressurising the well tubular metal structure by means of the fracturing fluid derived from in situ hydro-carbons for moving the sleeve of the first self-closing flow assembly and thereby opening the port; injecting the fracturing fluid derived from in situ hydr-carbons through the port of the first self-closing flow assembly for providing fractures in the formation; decreasing a pressure of the fracturing fluid by 0.5-20% for releasing the activation device from the first self-closing flow assembly, thereby closing the port; and moving the activation device by means of pressurised fracturing fluid for engaging a second self-closing flow assembly.