Angled perforating device for well completions
Inactive Publication Date: 2005-11-10
SPRING ROGER L +2
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Benefits of technology
[0020] The present invention utilizes existing technology of the perforating industry in a new way to address a number of reservoir conditions that can exist in a well. The present invention perforating device utilizes positioning the perforating charges at an angle from horizontal to accomplish a variety of different improvements in completion techniques depending on the specific reservoir conditions of the rock formation. Angled perforating can be utilized to intersect bedding planes for permeability streaks, to intersect rock fractures, to intersect coal cleats, to angle away from water or gas contacts, to contact more of the rock formation with less perforations for both less cost and improved performance during subsequent acid or fracturing treatments. The present invention can for nominal cost improve the performance of almost every oil or gas completion. The improvement in the angled perforation completion can also reduce over all costs by requiring less perforations and improved stimulation treatments. The present invention can provide improved completions for greater rates and recovery while also reducing completion costs.
Problems solved by technology
This is similar to the previously discussed casing gun with the addition of larger charges that will cause significant distortion to the hollow steel carrier.
The smaller diameter is not as capable of absorbing the explosive charge and the outer diameter of the hollow carrier is distorted, making this type of perforating gun expendable.
Perforating in the same general direction as the bedding plane of the rock formation has its limitations.
The limited use for angled perforating has been limited to trying to keep the perforations free from debris, for detonation from one charge to another without a prima cord, to run a strip gun through tubing at an angle for greater clearance, creating a cavity to treat for consolidation, to wash out two closely intersecting perforations and to create an elliptical perforations perpendicular to the bedding plane to reduce sand production and increase hydrocarbon production.
Method used
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[0037] In the following description, details of the present invention are given to provide an understanding of the present invention. However, those skilled in the art will know that the present invention may be practiced without these details and that numerous variations or modifications from the described embodiments are possible.
[0038] Rock formations on the surface of the earth are constantly being eroded by the elements and are redeposited by means of gravity as sediments. Sediments on the surface of the earth are generally deposited horizontally whether on land or in water. The repeated layering of these sediments creates bedding planes. These sediments are compacted and buried under newer sediments. The buried sediments eventually form various forms of geological rock formations. Some of the effects of the bedding planes are transformed into permanent features of the rock formations. During the transformation into a rock formation and afterwards, the rock formations are subj...
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The present invention is an improvement in the design of a perforating gun to perforate the casing and rock formations in oil and gas wells. Perforating guns are cylindrical vessels with explosive charges at specified intervals designed to shoot perpendicularly outwardly through the vessel, perforating the casing and into the rock formation. As most wells are generally straight and most formations are relatively flat, the perforations are horizontal in the same direction as the bedding plane of the rock formations. The present invention is to angle the explosive charges so as to cause the perforation to shoot at an angle to horizontal and across the bedding planes of the rock formations. The angled perforations can result in improved completions in stratified reservoirs and fractured reservoirs by contacting all the stratified layers for production and contacting more of the fractures for production. Similarly, the angled perforations would contact more of the cleats in coal seams for improved production of coal be methane. Numerous other examples of reservoir conditions could make the present invention advantageous in contacting more of the formation with less perforating charges while at the same time improving production rates and long term recovery of hydrocarbons.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] Not Applicable STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] Not Applicable REFERENCE TO A MICROFICHE APPENDIX [0003] Not Applicable BACKGROUND OF THE INVENTION [0004] The invention relates generally to an improvement in the design of an oil and gas well perforating device. The improvement applies to a type of perforating device that is typically lowered into the well through the casing or tubing in the well to a position where the explosive charges are detonated at the desired depth to shoot outwardly perpendicularly from the perforating device and well casing. The improvement is a method of angling the explosive charges such that when detonated the charges fire upwardly or downwardly from horizontal. While angling the explosive charges will decrease the distance away from the wellbore, there are many reservoir conditions of the rock formation that can benefit from perforating at an angle. [0005] After an oil o...
Claims
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Login to View More IPC IPC(8): E21B43/117E21B43/119E21B43/267
CPCE21B43/119E21B43/117
InventorSPRING, ROGER L.SPRING, ROBERT J.CONNER, TERRY L.
OwnerSPRING ROGER L