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Title: Overbalance perforating and stimulation method for wells

Abstract

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.

Inventors:
; ;
Publication Date:
OSTI Identifier:
7106618
Patent Number(s):
US 5131472; A
Application Number:
PPN: US 7-699987
Assignee:
Oryx Energy Co., Dallas, TX (United States) NOV; NOV-92-045097; EDB-92-169727
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

Citation Formats

Dees, J.M., Handren, P.J., and Jupp, T.B. Overbalance perforating and stimulation method for wells. United States: N. p., 1992. Web.
Dees, J.M., Handren, P.J., & Jupp, T.B. Overbalance perforating and stimulation method for wells. United States.
Dees, J.M., Handren, P.J., and Jupp, T.B. 1992. "Overbalance perforating and stimulation method for wells". United States. doi:.
@article{osti_7106618,
title = {Overbalance perforating and stimulation method for wells},
author = {Dees, J.M. and Handren, P.J. and Jupp, T.B.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1992,
month = 7
}
  • A wireline operated well perforating apparatus is described adapted to be positioned below a packer mounted in a wellbore comprising: (a) a running tool adapted to be supported on a wireline; (b) a pressurized surge tank operably connected to the running tool; (c) means for supporting a perforating gun on the surge tank and means for selectively opening communication between the surge tank and the wellbore to reduce pressure in the wellbore adjacent the surge tank; and (d) frangible valve means in the upper end of the surge tank to close communication between pressure from well fluid above the surgemore » tank and pressure in the wellbore below the surge tank. The method of completing a well comprising: setting a packer in the well bore at a desired distance above the zone to be perforated, running a retrievable running tool having a pressurized surge tank and a perforating gun connected thereto and adapted to extend below the packer until the running tool reaches the packer and the perforating gun is below the packer, actuating the perforating gun to perforate the well bore below the packer, disconnecting the running tool from the surge tank and perforating gun, retrieving the retrievable running tool, running a string of tubing and landing the lower end of same in the upper end of the surge tank and rupturing a frangible disk in the upper end of the surge tank to open communication therethrough to receive fluid from below the packer.« less
  • A method of perforating the sub-surface formation located in the area of an oil or gas well bore hole comprising directing a high powered coherent light beam axially along the bore hole to a predetermined depth therein from a surface location, deflecting the beam at said depth along a deflected beam axis, and successively focusing the beam at said depth to concentrate the beam at each of a plurality of spaced focal points along the deflected beam axis. The method (1) provides a significant increase in the distance (length) to which the calculated oil or gas bearing formations can bemore » perforated (from a present nominal 18 inches to 200 feet or more), thus providing the opportunity for increased yield; and (2) provides an accurate determination of the exact near horizontal plane orientation of such perforations so that each can be aimed in the direction of the most promising formation pay zone.« less
  • A method of fracturing a subterranean formation with a stabilized foamed fracturing fluid comprising from about 30 percent to in excess of about 95 percent by volume of carbon dioxide with the remainder comprising a substantially anhydrous liquid and a selected surfactant. The foam is formed in situ by injection of a stabilized liquid-liquid emulsion containing liquid carbon dioxide into a well bore penetrating the formation. The temperature and pressure of the emulsion is controlled to maintain the carbon dioxide in the liquid phase during injection into the well bore. Thereafter, the carbon dioxide is heated by the subterranean formationmore » to a temperature above about 88/sup 0/ F. at which time the stabilized emulsion spontaneously forms a high quality stabilized foam.« less
  • Crude oil and gas production wells, which no longer produce oil or gas utilizing conventional primary and secondary means of recovery, can be returned to production by treatment comprising addition of a non-aqueous solution of certain phosphate ester surfactants followed by successive treatment with water or a hydrocarbon. Increased production also can be obtained in low-producing oil and gas wells by similar treatment with certain phosphate ester surfactants. Subsequent to treatment of a producer well, the phosphate ester surfactant is forced into the formation utilizing water or a hydrocarbon and said surfactant is allowed to remain in the producing wellmore » for an effective period of at least 12 hours. Thereafter, pumping and/or conventional fluid drive means are then utilized to recover oil or gas from the subterranean oil or gas formation. The amount of non-aqueous surfactant solution utilized is sufficient to permeate the oil or gas subterranean formation in the area immediately adjacent to the producing well bore and up to a radius therefrom of about 20 feet.« less
  • A method of fracturing a subterranean formation with a stabilized foamed fracturing fluid comprising from about 50 percent to in excess of about 96 percent by volume of carbon dioxide with the remainder comprising an aqueous liquid and a selected surfactant. The foam is formed in situ by injection of a stabilized liquid-liquid emulsion containing liquid carbon dioxide into a well bore penetrating the formation. The temperature and pressure of the emulsion is controlled to maintain the carbon dioxide in the liquid phase during injection into the well bore. Thereafter, the carbon dioxide is heated by the subterranean formation tomore » a temperature above about 88/sup 0/ F. at which time the stabilized emulsion spontaneously forms a high quality stabilized foam.« less