An oil or gas well is completed by cementing a casing string in a well having a special joint providing incipient perforations therein. The incipient perforations are closed during the cementing of the casing string in the well bore and are opened after the cement sets up. Preferably, the incipient perforations are opened concurrently with the fracturing of the cement sheath and the formation from which production is desired. The perforations of this invention are quite large and bear a ratio with the quantity of propellant in which there is at least 14 square inches of casing openings per cubic foot of propellant.
A projectile having a length to diameter ratio greater than 6 to 1 is propelled from a launcher by a propellant charge toward a rock target at velocities of 500 ft. /sec. and higher to more efficiently penetrate the rock for excavation purposes.
A method of treating a hydrocarbon producing well involves injecting into the well a combustible mixture including a gaseous phase material. The combustible mixture is ignited to produce a quantity of hot combustion products which flow into a hydrocarbon bearing formation. Because of the relatively rapid travel of these combustion products, some fracturing of the formation occurs adjacent the well bore which increases permeability of the formation. When the formation contains low gravity, high viscosity oil, the hot combustion products also heat the oil thereby lowering its viscosity and also provides some gas which may become intermingled or dissolved in the oil to provide a drive mechanism for moving the oil into the well bore where it can be recovered by conventional pumping devices.
A method of stimulation oil well production uses a gas generating chemical charge that is placed in the oil well bore at a depth of known oil productivity where it is ignited to generate a gas pressure-volume pulse of known pressure-time characteristics and time duration, the pressure time characteristics includes a pulsating pressure for greater penetration effect.
Formation Stimulating Tool With Anti-Acceleration Provisions
A device for fracturing a subterranean formation includes a propellant charge which generates, during combustion, a large quantity of high pressure combustion products. A drogue is provided on the device to prevent or minimize rapid upward movement of the device during combustion. This obviates "bird nesting" of the wire line, wire line damage and the like.
A gas generating type tool includes a propellant charge having an axially extending passage receiving therein an ignition tube containing a quantity of easily ignited, fast burning powder. The propellant and ignition tube are separately handled and/or transported until ready to run into the well. The tube slides easily into the propellant passage. The propellant passage is at least about 12% larger in cross-section than the ignition tube and not more than about 55% larger in cross-section. In circular cross-sections, the propellant passage is at least about 6% greater in diameter and not more than about 25% greater in diameter.
Stimulating Subterranean Formations In The Open Hole
A subterranean formation is fractured by burning a quantity of fuel in an uncased bore hole to generate a large quantity of high pressure combustion products. These gases rapidly flow into the formation creating the fractures. The device is assembled in the well by placing a thermal ignitor in the well and delivering a quantity of fuel and oxidizer around the ignitor. The fuel and oxidizer comprise a flowable material and are either pumped or poured into the well.
Technique And Apparatus For Stimulating Long Intervals
A gas generating type fracturing tool is designed to work on long productive intervals and includes a series of separate propellant charges, an igniter for initiating combustion of one of the charges and means for transferring combustion from one charge to the next. In one embodiment, combustion of the charges occurs one after another with little or no delay between successive charges. In other embodiments, a delay is incorporated in the combustion train between successive charges. Some embodiments are specifically designed to unplug uncemented slotted liners and have very small gas generation capability.
Name / Title
Company / Classification
Phones & Addresses
Henry Mohaupt Principal
Servo-Dynamics Inc Administrative Office
5736 Thornwood Dr, Santa Barbara, CA 93117 PO Box 6679, Santa Barbara, CA 93160 28231 Ave Crocker, Santa Clarita, CA 91355 8059673578
Henry Mohaupt President
SERVO-DYNAMICS, INC
Ct Corporation System, Charleston, WV 25313 1151 Estrella Dr, Santa Barbara, CA 93110