Coiled tubing overbalance stimulation system
a stimulation system and overbalance technology, applied in the direction of fluid removal, earth-moving drilling, borehole/well accessories, etc., can solve the problems of inability to multi-formation wells, high cost and often uneconomical, and significant restriction of well productivity
Inactive Publication Date: 2006-12-21
SCHLUMBERGER TECH CORP
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Benefits of technology
[0009] In another embodiment, the extreme overbalance stimulation method includes positioning an assembly connected to coiled tubing adjacent a target formation zone, wherein the assembly includes a perforating gun. A desired pressure is accumulated in the coiled tubing with a treatment fluid. The desired pressure is at least equal to the fracture pressure of the target formation zone. Upon detonating the perforating gun the accumulated pressure is substantially instantaneously released through the assembly at the target formation zone. Creating a temporary path of least resistance, ensuring preferential flow toward the targeted zone in open hole and slotted liner completions.
Problems solved by technology
The region of the formation proximate the wellbore is very often the most significant restriction to the well's productivity.
This region is frequently damaged during the drilling of the wellbore creating resistance to fluid flow through the region.
Prior art methods have been utilized, however, these methods are expensive and often uneconomical and thus not feasible for multi-formation wells.
The prior art systems fail to provide a mechanism for selectively treating formation zones in uncompleted, open hole, wellbores or slotted liner completions.
Method used
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[0019] Refer now to the drawings wherein depicted elements are not necessarily shown to scale and wherein like or similar elements are designated by the same reference numeral through the several views.
[0020] As used herein, the terms “up” and “down”; “upper” and “lower”; and other like terms indicating relative positions to a given point or element are utilized to more clearly describe some elements of the embodiments of the invention. Commonly, these terms relate to a reference point as the surface from which drilling operations are initiated as being the top point and the total depth of the well being the lowest point.
[0021]FIG. 1 is an illustration of an embodiment of an overbalance stimulation procedure and system using coiled tubing, generally denoted by the numeral 10. Overbalance stimulation system 10 includes a coiled tubing unit 14 having coiled tubing 16 for spooling into and out of a wellbore 18 via an injector head 20 (or other coiled tubing deployment apparatus) thro...
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Formation zones of interest may be isolated and stimulated by substantially instantaneously providing a pressure equal to or greater than the fracture pressure of the targeted zone. A treatment fluid is accumulated in coiled tubing until the pressure is equal to or greater than the fracture pressure of the targeted zone. The accumulated pressurized treatment fluid is released substantially instantaneously at the targeted formation zone. The accumulated pressurized treatment fluid may be substantially simultaneously released with the detonation of a perforation gun.
Description
FIELD OF THE INVENTION [0001] The present invention relates in general to stimulating a well to increase the rate of flow into or out of the surrounding formation and more particularly to a method and apparatus for extreme overbalance stimulation of the formation surrounding a well utilizing coiled tubing. BACKGROUND [0002] Well stimulation refers to techniques used for increasing the productivity of the formations surrounding the well. For production wells, it is important to increase the rate at which fluid flows from the formation into the wellbore. For injection wells, it is often important to increase the rate of injection of fluid into the surrounding formation. [0003] The region of the formation proximate the wellbore is very often the most significant restriction to the well's productivity. This region is frequently damaged during the drilling of the wellbore creating resistance to fluid flow through the region. The resistance to fluid flow near the wellbore is defined by “s...
Claims
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Login to View More IPC IPC(8): E21B43/26E21B43/116
CPCE21B43/26E21B43/14
Inventor MAHDI, ABBASLEMP, STEPHEN P.KOVACS, JOHN
Owner SCHLUMBERGER TECH CORP