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Method for increasing product recovery in fractures proximate fracture treated wellbores

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20140144623 patent thumbnailZoom

Method for increasing product recovery in fractures proximate fracture treated wellbores


capturing said product from said fracture through said at least non-stimulated well, and recovering said captured product optionally at said surface. c. providing at least one non-stimulated well, proximate said first well at a second predetermined depth in said formation and contacting said at least one distal point of said at least one fracture; said at least one non-stimulated well further including at least one access point to capture product from said at least one fracture in said formation; b. stimulating said well resulting in at least one fracture in said formation; said fracture having at least one initiation point and at least one distal point; wherein said at least one initiation point is proximate said stimulated well and said at least one distal point is distant said stimulated well; a. providing a first well that may be stimulated or has been stimulated at a first predetermined depth within a formation; A method of recovering product from a fracture below a surface, said method including:
Related Terms: Fracture

Browse recent Nexen Energy Ulc patents - Calgary, CA
USPTO Applicaton #: #20140144623 - Class: 1662501 (USPTO) -
Wells > Processes >With Indicating, Testing, Measuring Or Locating >Fracturing Characteristic

Inventors: James Frederick Pyecroft, Brian Douglas Bearinger, Eric Von Lunen

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The Patent Description & Claims data below is from USPTO Patent Application 20140144623, Method for increasing product recovery in fractures proximate fracture treated wellbores.

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FIELD OF THE INVENTION

The invention relates generally to the field of horizontal hydrocarbon exploration and development wells and field development methods. In particular, the invention relates to increasing product recovery, in particular hydrocarbon recovery from fractures proximate fractured wellbores, preferably hydraulic fractured wellbores, through subsurface rock formations. More specifically, the invention relates to a non-treated, preferably non-hydraulic fractured substantially deviated wellbore, wherein said non-treated substantially deviated wellbore is non-treated during product recovery, proximate a fracture treated, preferably a hydraulic fractured treated substantially deviated wellbore to allow for recovery of product, in particular hydrocarbons from fractures in said rock formations and methods for using same.

BACKGROUND OF THE INVENTION

Commercial extraction of reservoir product, such as oil and/or gas or combinations thereof, from certain subsurface rock formations requires a wellbore extending through the formation to a reservoir. In order to increase recovery of oil and/or gas or combinations thereof from rock formations and reservoirs, wellbores are stimulated, in one instance through hydraulic fracturing resulting in a hydraulic fracture in the formation surrounding the wellbore. Typically wellbores are drilled in a pattern that benefits the most from the dominant hydraulic fracture direction. Wellbores are placed side by each, in one example, in a substantial pitchfork fashion, such that wellbores are evenly spaced at a distance or proximity that permit efficiency in drainage of hydrocarbon fluid or gas, contained in the reservoir and fracture, into said wellbore.

If wellbores are drilled too far apart, an increasingly large portion of the desired reservoir product is left behind in the reservoir, and in particular the fracture. It is well documented in the oil and gas industry that each hydraulic fracture, while intersecting reservoir rock at great distances from the wellbore; does not effectively produce oil and gas from the entire length of the fracture. It is accepted that up to 66% or more of the created fracture length will not contribute significantly to production. In other words, only 34% of the fracture may be contributing to overall hydrocarbon production.

SUMMARY

OF THE INVENTION

The following terms are used herein to better understand the present invention. Hydrocarbon fluid means gas, oil or combinations thereof that may also include other components, such as water used when fracturing a wellbore.

Induced fracture means a fracture induced by any means including stimulating a wellbore using fracture stimulating techniques, including hydraulic fracture stimulating techniques.

Non-stimulated (passive) wellbore means a wellbore that is not directly stimulated via said wellbore in order to stimulate fractures or hydrocarbon production but captures hydrocarbon fluid or product from fractures originating from a stimulated wellbore. The term non-stimulated (or passive) also means stimulated (or fractured) less than a stimulated well, preferably substantially non-stimulated (non-fractured), more preferably not stimulated (not fractured). The term also means not only less frequency of stimulation (fracturing), but also partial stimulation (fracturing) of a wellbore. The term non-stimulated also means that the well or wellbore is non-stimulated at and/or during the time of capturing product according to the process described herein.

Product means any product contained in a rock formation or subterranean formation such as hydrocarbon or the like. In other instances, solute from a salt mining operation, such as sodium chloride and/or potassium chloride or other minerals dissolved from said rock formation, including geothermal heated water or steam.

According to one aspect of the invention, there is provided a method of recovering a product, preferably hydrocarbon (gas, oil and combinations thereof) fluids from a reservoir below a surface, preferably normally not recoverable through a induced fracture proximate a stimulated substantially horizontal wellbore at a first predetermined depth in a formation, said method comprising:

providing at least one stimulated substantially horizontal wellbore at a first predetermined depth in a formation; wherein said stimulation results in at least one induced fracture, preferably more than one induced fracture, in said formation, preferably in said reservoir, proximate said at least one stimulated substantially horizontal wellbore; said at least one induced fracture having at least an initiation point proximate said at least one stimulated substantially horizontal wellbore and at least one distal point, distant said at least one stimulated substantially horizontal wellbore; providing at least one non-stimulated wellbore, preferably stimulated less than said stimulated wellbore, more preferably substantially non-stimulated, proximate said stimulated wellbore at a second predetermined depth in said formation, preferably substantially parallel to said stimulated wellbore, wherein said at least one non-stimulated wellbore further comprises at least one access point to capture product, preferably hydrocarbon from said formation, capturing said product, preferably hydrocarbon fluids from said at least one fracture, and recovery said captured product, preferably hydrocarbon fluids at said surface. In one embodiment, said first and second predetermined depths are substantially the same. In another embodiment, said first and second predetermined depths are substantially different. Preferably said at least one non-stimulated wellbore is proximate said at least one distal point of said at least one induced fracture, more preferably said at least one non-stimulated wellbore is in contact with said at least one induced fracture, preferably transverses said at least one induced fracture.

According to another aspect of the invention, there is provided a product recovery system, preferably a hydrocarbon recovery system comprising:

at least one stimulated substantially horizontal wellbore at a first predetermined depth in a formation; wherein said stimulation results in at least one fracture proximate said at least one stimulated substantially horizontal wellbore; at least one non-stimulated wellbore, preferably stimulated less than said stimulated wellbore, more preferably substantially non-stimulated, proximate said stimulated wellbore at a second predetermined depth in said formation, preferably substantially parallel to said stimulated wellbore, wherein said at least one non-stimulated wellbore further comprises at least one access point to capture product, preferably hydrocarbon from said formation of said at least one stimulated wellbore.

According to yet another aspect of the invention, there is provided a diagnostic method and system to determine the location of subsurface fractures, said diagnostic method and system comprising:

providing at least one stimulated substantially horizontal wellbore at a first predetermined depth in a formation; wherein said stimulation results in at least one fracture, preferably more than one fracture, proximate said at least one stimulated substantially horizontal wellbore; introducing at least one marker or tracer, preferably a Gama emitting tracer or the like into said at least one stimulated substantially horizontal wellbore, such that said tracer enters at least one fracture, preferably more than one fracture, proximate said stimulated wellbore; providing at least one non-stimulated wellbore, preferably stimulated less than said stimulated wellbore, more preferably substantially non-stimulated, proximate said stimulated wellbore at a second predetermined depth in said formation, preferably substantially parallel to said stimulated wellbore, wherein said at least one non-stimulated wellbore further comprises at least one access point to capture said at least one marker or tracer from said formation, capturing said at least one marker or tracer from said at least one fracture, and mapping the location and path of said marker or tracer to identify the location of said at least one fracture in said formation, resulting in information to map said at least one fracture, preferably more than one fracture, within a discrete fracture network, (DFN), mapping processes known in the industry. Said diagnostic method may reveal improvements in fracture design such that the induced fracture process in the actively stimulated wells can be achieved more efficiently while considering all resources, natural and capital (e.g., water, sand, hydrocarbon energy sources, and currency investment).

Furthermore, there is provided a method of monitoring wellbore parameters, preferably pressure in the at least one non-stimulated wellbore, preferably stimulated less than said stimulated wellbore, more preferably substantially non-stimulated, preferably before, during and after the stimulation of at least one stimulated wellbore. Preferably said monitoring indicating the interval when a fracture, produced by the stimulation of the at least one stimulated wellbore, comes in contact with, preferably intersects with, the at least one non-stimulated wellbore. Preferably said pressure is monitored with devices, preferably pressure sensors or gauges proximate said non-stimulated wellbore, preferably within said wellbore. In one embodiment, said pressure is monitored via a surface pressure gauge. This information, preferably knowledge of this interval may be used to improve fracture design processes in a manner similar to the above marker and tracer process. In addition, logging the drilled open hole with imaging logs to visualize natural fractures before the wellbores are drilled, and then after they are fracture stimulated to visualize the location the created fractures contact, preferably intersect the non-stimulated wellbore, may assist in understanding how fractures grow and propagate.

Preferably, said at least one non-stimulated wellbore further comprises a slotted liner.

Preferably said at least one non-stimulated wellbore is not cased.

In one embodiment, said at least one stimulated and said at least one non-stimulated wellbore have a common entry point from said surface.

In another embodiment, said at least one stimulated and said at least one non-stimulated wellbore each has a distinct entry point from said surface.

In one embodiment, said at least one non-stimulated wellbore is substantially beneath said at least one stimulated wellbore.

In another embodiment, said at least one non-stimulated wellbore is substantially above said at least one stimulated wellbore.

In another embodiment, said at least one non-stimulated wellbore is substantially at the same height of said at least one stimulated wellbore.

In another embodiment, at least two non-stimulated wellbores are proximate said at least one stimulated wellbore, preferably substantially above and substantially below said stimulated wellbore.

In another embodiment, said at least one non-stimulated wellbore is preferably stimulated less than said stimulated wellbore, more preferably substantially non-stimulated.

In another embodiment, there is provided a method and system of reducing costs associated with hydrocarbon fluid recovery from below the surface, said method and system comprising any of the methods and systems disclosed herein.

According to yet another embodiment, the at least one non-stimulated wellbore is an existing well previously stimulated but not directly stimulated at or during the time of the process of the present invention. In this instance, a well previously stimulated, but having been shut in or unused for a period of time, may now be the non-stimulated well recovering product proximate a stimulated well.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a depiction of a typical fractured wellbore in the field.

FIG. 2 is a depiction of a non-fractured (or non-stimulated) wellbore according to the present invention above a fractured (or stimulated) wellbore.

FIG. 3 is a depiction of a non-fractured (or non-stimulated) wellbore according to the present invention below a fractured (or stimulated) wellbore.

FIG. 4 is a depiction of two non-fractured (or non-stimulated) wellbores according to the present invention, one above and one below a fractured (or stimulated) wellbore.

FIG. 5 is a depiction of a plurality of non-fractured (or non-stimulated) wellbores according to the present invention proximate a fractured (or stimulated) wellbore and contacting a fracture resulting from the stimulation of the fractured wellbore.

FIG. 6 is a depiction of tracers identified in untraced wellbores from fractures created by stimulated wellbores proximate the untraced wellbores.

FIG. 7 is a depiction of a map view of wellbores in a formation.

DETAILED DESCRIPTION

OF THE PREFERRED EMBODIMENTS

Other aspects and advantages of the invention will be apparent from the following description and the appended claims.

Referring now to FIG. 1, there is provided a typical fractured wellbore 23 resulting in a plurality of fractures 22 in the rock formation below the ground 19. An entry point 20 to the wellbore 23 above the ground level is provided. In one example, a first substantially horizontal wellbore 23 is drilled into a formation. The wellbore is cased and prepared as known to a person of ordinary skill in the art, for hydraulic fracturing. Referring now to FIG. 2, a second wellbore 24 is drilled proximate said first wellbore 23, particularly above said fractured wellbore 23. In this instance, the second wellbore 24 is not prepared in the typical manner for hydraulic fracturing. Rather the second wellbore 24 is considered passive in nature. The passive wellbore 24 may be lined in any manner in order to prevent collapse of said wellbore, preferable with a slotted liner or the like or the wellbore may be left as an open hole. In one example, typical completions may require an intermediate casing set in the substantially horizontal wellbore and cemented to the surface. A passive or non-stimulated wellbore would then emanate from the end of said intermediate casing permitting flow of hydrocarbon from a reservoir in an underground formation to the surface via the intermediate casing, production tubing or production casing as per traditional completions methods employed in the hydrocarbon industry. In this instance, the passive or non-stimulated wellbore may be open hole or the open hole section may be supported to prevent collapse thereof, such as, but not limited to, a slotted liner or pre-perforated casing or casing that is similarly perforated as the stimulated wellbore. In a preferred embodiment, the production casing or liner residing in the horizontal portion of the passive wellbore would not be cemented in place.

When the first wellbore undergoes stimulation, in this case, hydraulic fracturing stimulation, the passive wellbore is available to capture hydrocarbons not necessarily recoverable through the stimulated wellbore (as best seen in FIGS. 2-5). The passive wellbore, through the slotted liner, or the like, captures hydrocarbon, which may consist of gas, liquid or a combination of the two and other components, such as fracturing fluid, and the captured hydrocarbon is then collected, preferably at the surface level, using conventional collection means, via completion equipment commonly employed and so designed to handle product or fluid, being any produced gas, hydrocarbon or other non-hydrocarbon containing liquid such as water consisting of fracturing fluid, formation water, salt brine or other mineral rich water, or hydrocarbon liquids such as oil, condensate or any combination of said fluids.

Referring now to FIG. 3, there is provided a stimulated or fractured wellbore 23 with a non-stimulated wellbore 25 below said fractured wellbore 23.



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stats Patent Info
Application #
US 20140144623 A1
Publish Date
05/29/2014
Document #
14092246
File Date
11/27/2013
USPTO Class
1662501
Other USPTO Classes
166271, 166 52, 166 50
International Class
21B49/08
Drawings
6


Fracture


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