초록 ▼

An apparatus and method for perforating and fracturing subterranean formations to enhance fluid production. At least one unlined punch charge is loaded into at least one punch charge carrier, and the void spaces in the punch charge carrier are filled with sand. The punch charge carrier is assembled

An apparatus and method for perforating and fracturing subterranean formations to enhance fluid production. At least one unlined punch charge is loaded into at least one punch charge carrier, and the void spaces in the punch charge carrier are filled with sand. The punch charge carrier is assembled with at least one perforating charge carrier, loaded with at least one perforating charge, and a means for detonation. The assembly is positioned in a well containing a pressurized fluid adjacent the interval to be perforated and/or fractured, and the charges are detonated. The one or more punch charges create one or more apertures in the punch charge carrier, allowing sand to enter the well and be carried by the fluid in the well into the perforations and/or fractures created by the perforating charges and the pressurized fluid. The sand scours and/or props the perforations and/or fractures.

대표청구항 ▼

A punch charge mounted in a charge carrier for use in a well penetrating a subterranean formation and having a casing, the charge comprising: a case containing an unlined shaped explosive, the explosive capable upon detonation of creating an aperture in a wall of the charge carrier while leaving the

A punch charge mounted in a charge carrier for use in a well penetrating a subterranean formation and having a casing, the charge comprising: a case containing an unlined shaped explosive, the explosive capable upon detonation of creating an aperture in a wall of the charge carrier while leaving the well casing intact. A method for creating fractures in an interval of a subterranean formation penetrated by a cased well, the method comprising: (a) assembling a rigid string comprising: a tubing string; at least one punch charge mounted in an punch charge carrier, the carrier having void spaces filed with sand; at least one perforating charge carrier having a wall and ends enclosing void spaces; means for detonating the at least one punch charge and the at least one perforating charge; (b) utilizing the tubing string to position the assembly in the well so that the at least one perforating charge carrier is adjacent the interval; (c) supplying a liquid under pressure to at least a portion of the well, at least part of the portion adjacent the interval in the formation; (d) utilizing the detonating means to detonate the at least one punch charge and the at least one perforating charge, thereby releasing sand from the at least one punch charge carrier into the pressurized liquid and creating a pathway for the pressurized liquid to enter and fracture the interval of the formation.