US20120181031A1 - Stimulating and surging an earth formation - Google Patents
Stimulating and surging an earth formation Download PDFInfo
- Publication number
- US20120181031A1 US20120181031A1 US13/007,815 US201113007815A US2012181031A1 US 20120181031 A1 US20120181031 A1 US 20120181031A1 US 201113007815 A US201113007815 A US 201113007815A US 2012181031 A1 US2012181031 A1 US 2012181031A1
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- Prior art keywords
- wellbore
- pressure
- formation
- fracture
- decreasing
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 122
- 230000004936 stimulating effect Effects 0.000 title description 5
- 238000000034 method Methods 0.000 claims abstract description 64
- 230000003247 decreasing effect Effects 0.000 claims abstract description 46
- 238000004891 communication Methods 0.000 claims abstract description 44
- 230000004044 response Effects 0.000 claims abstract description 21
- 230000002708 enhancing effect Effects 0.000 claims abstract description 15
- 239000003380 propellant Substances 0.000 claims description 31
- 230000001965 increasing effect Effects 0.000 claims description 28
- 238000010304 firing Methods 0.000 claims description 18
- 230000000977 initiatory effect Effects 0.000 claims description 4
- 238000005755 formation reaction Methods 0.000 description 98
- 208000010392 Bone Fractures Diseases 0.000 description 33
- 239000012530 fluid Substances 0.000 description 14
- 230000007423 decrease Effects 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 230000000638 stimulation Effects 0.000 description 4
- 238000009991 scouring Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/10—Well swabs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Definitions
- This disclosure relates generally to equipment utilized and operations performed in conjunction with a subterranean well and, in an example described below, more particularly provides for stimulating and surging an earth formation.
- One way of achieving this goal is to provide for enhanced fluid communication between wellbores and formations penetrated by those wellbores.
- systems and methods are provided which bring improvements to the art of improving fluid communication between a formation and a wellbore.
- One example is described below in which only a single trip of a perforating string into a wellbore can accomplish perforating, stimulating and surging of a formation.
- Another example is described below in which surging of the formation occurs while increased pressure is applied to the formation.
- this disclosure provides to the art a method of enhancing communication between a wellbore and an earth formation intersected by the wellbore.
- the method can be performed by fracturing the formation in response to firing a perforator in the wellbore, and then, a predetermined delay period after firing the perforator, decreasing pressure in the wellbore.
- pressure in the wellbore may be decreased to less than formation pressure.
- this disclosure describes an example of a method of enhancing communication between a wellbore and an earth formation, with the method including assembling a perforating string and, in a single trip of the perforating string into the wellbore: a) perforating the wellbore, b) fracturing the formation by increasing pressure in the wellbore, and c) decreasing pressure in the wellbore by exposing the wellbore to a low pressure volume.
- a method can include igniting a propellant in a wellbore, thereby increasing pressure in the wellbore and fracturing the formation, and then decreasing pressure in the wellbore by exposing the wellbore to a low pressure volume.
- the wellbore is not necessarily perforated in this method.
- a still further aspect involves a method of enhancing communication between a wellbore and an earth formation having an initial formation pressure, with the method including increasing pressure in the wellbore and thereby fracturing the formation, and then, while the wellbore pressure is greater than the formation pressure, decreasing pressure in the wellbore by exposing the wellbore to a low pressure volume.
- a method of enhancing communication between a wellbore and an earth formation intersected by the wellbore can include forming a fracture in the formation, and permitting communication between the wellbore and a low pressure volume in response to a desired characteristic of the fracture being maximized.
- Another method of enhancing communication between a wellbore and an earth formation can include forming a fracture in the formation; and then, while pressure in the formation proximate the wellbore is at least about a closure pressure of the fracture, decreasing pressure in the wellbore by exposing the wellbore to a low pressure volume.
- FIG. 1 is a schematic partially cross-sectional view of a well system and associated method which can embody principles of the present disclosure.
- FIG. 2 is an enlarged scale schematic cross-sectional view of perforations extending into an earth formation in the system and method of FIG. 1 .
- FIG. 3 is a schematic partially cross-sectional view of a delay device which may be used in the system and method of FIG. 1 .
- FIG. 4 is a schematic partially cross-sectional view of a valve which may be used in the system and method of FIG. 1 .
- FIG. 5 is a schematic flow chart for the method.
- FIG. 1 Representatively illustrated in FIG. 1 is a well system 10 and associated method which can embody principles of this disclosure.
- the scope of this disclosure is not limited only to the specific examples of the well system 10 and method described herein, since other well systems and methods can be used, if desired.
- a perforating string 12 is positioned in a section of a wellbore 14 which intersects an earth formation 16 .
- the perforating string 12 includes a perforator 18 , a delay device 20 and a valve 22 .
- the perforator 18 is illustrated in FIG. 1 as a tubing conveyed perforating gun (e.g., having perforating charges contained within a tubular gun housing, etc.).
- a tubing conveyed perforating gun e.g., having perforating charges contained within a tubular gun housing, etc.
- other types of perforators such as, wireline-conveyed perforators, etc. may be used instead.
- a firing head 24 may be used to control firing of the perforator 18 . Any type of firing head (mechanical, electrical, telemetry controlled, etc.) which is compatible with the perforator 18 can be used.
- a propellant 26 is associated with the perforator 18 , so that the propellant is ignited in response to the perforator being fired.
- One suitable propellant sleeve is included with a perforating gun and marketed as the STIMGUNTM by Halliburton Energy Services, Inc. of Houston, Tex. USA.
- the STIMGUNTM could be used for the perforator 18 and propellant 26 in the perforating string 12 .
- propellants and perforators can be used instead, in keeping with the scope of this disclosure (for example, the propellant could be disposed inside the perforator, otherwise shaped or configured, etc.).
- the delay device 20 provides a predetermined delay period between the perforator 18 firing and the valve 22 actuating.
- the delay device 20 comprises a pyrotechnic fuse which is ignited when the perforator 18 is fired.
- the valve 22 controls fluid communication between the wellbore 14 and a low pressure volume 28 .
- the valve 22 When the valve 22 is actuated, it exposes the wellbore 14 to the low pressure volume 28 , thereby decreasing pressure in the wellbore.
- the volume 28 is “low pressure” in that it is preferably substantially less than formation pressure in the formation 16 near the wellbore 14 .
- the pressure in the volume 28 may be less than, greater than, or equal to, pressure in the wellbore 14 at the time the perforating string 12 is installed.
- the volume 28 comprises an empty, sealed tubular housing having about atmospheric pressure therein.
- other types of low pressure volumes may be used instead, in keeping with the scope of this disclosure.
- a suitable valve for use in the perforating string 12 is the SURGEPROTM marketed by Halliburton Energy Services, Inc., although other valves may be used and still remain within the scope of this disclosure.
- SURGEPROTM is also the name of a software package which can be used to determine a number of valves 22 , and a number and size of the volume 28 to achieve a desired pressure decrease in the wellbore 14 , and a corresponding pressure differential from the formation 16 to the wellbore.
- Another software package (PULSFRACTM, marketed by Halliburton Energy Services, Inc.) can be used to determine the amount of propellant 26 and the timing of the delay before the valve 22 is opened, to achieve the desired pressure differential from the formation 16 to the wellbore 14 .
- perforations 30 are formed extending outward from the wellbore 14 , as schematically depicted in FIG. 2 .
- pressure is increased in the wellbore 14 , which causes fluid flow (indicated by arrows 32 in FIG. 2 ) outward into the formation 16 .
- one or more fractures 34 may be formed in the formation 16 , thereby providing for increased surface area exposure of the formation to the perforations 30 .
- the pressure in the wellbore 14 will maximize, and will no longer be great enough to cause fracturing of the formation 16 .
- the system 10 can be used to provide sufficient differential pressure to accomplish the surging, cleaning, etc. discussed above.
- the valve 22 is opened when the pressure in the wellbore 14 has been increased to greater than the initial formation pressure near the wellbore. In this manner, when pressure is decreased in the wellbore 14 (by exposing the wellbore to the low pressure volume 28 ), a relatively large pressure differential will be created to cause substantial fluid flow 36 from the formation 16 into the wellbore.
- the valve 22 is opened just after the fracture 34 has ceased growing (thereby obtaining a maximum extent of the fracture into the formation 16 ), but other timings may be used within the scope of this disclosure.
- the delay device 20 provides the predetermined delay period between firing the perforator 18 and opening the valve 22 . It is contemplated that a delay period of a few hundred milliseconds would be appropriate, but other delay periods can be used, if desired.
- Modeling software such as the SURGEPROTM system marketed by Halliburton Energy Services, Inc., may be used to determine optimum characteristics for the perforator 18 , propellant 26 , delay 20 and low pressure volume 28 to achieve desired perforation, stimulation and surging results.
- SURGEPROTM system marketed by Halliburton Energy Services, Inc.
- the SURGEPROTM software is used in conjunction with another system marketed by Halliburton Energy Services, Inc. as the PULSFRACTM system.
- the PULSFRACTM software predicts near wellbore stimulation resulting from propellant ignition in a wellbore
- the SURGEPROTM software predicts dynamic surges with modeling of perforating string volumes, surge valves, surge chambers, etc.
- the PULSFRACTM and SURGEPROTM software both incorporate models of the perforating string, wellbore geometry and formation characteristics.
- the PULSFRACTM software can be used to determine the amount of propellant needed to produce maximum fracturing without damage to downhole equipment.
- the PULSFRACTM software can also plot fracture length, width, conductivity and skin, versus time.
- the PULSFRACTM software can indicate the amount of time from igniting the propellant 26 to the fracture 34 achieving a greatest characteristic (e.g., length, width, conductivity, minimized skin, etc.).
- the SURGEPROTM software can then be used to determine the optimum size of the low pressure volume 28 to achieve a desired pressure reduction in the wellbore 14 (e.g., for optimized surging of the formation 16 and cleaning of the perforations 30 , etc.), with a delay between the perforator 18 being fired and the valve 22 being opened. This delay corresponds to the amount of time determined by the PULSFRACTM software for the desired characteristic of the fracture 34 (e.g., length, width, conductivity, minimized skin, etc.) to reach its maximum level.
- a desired pressure reduction in the wellbore 14 e.g., for optimized surging of the formation 16 and cleaning of the perforations 30 , etc.
- This delay corresponds to the amount of time determined by the PULSFRACTM software for the desired characteristic of the fracture 34 (e.g., length, width, conductivity, minimized skin, etc.) to reach its maximum level.
- both stimulation and surging can be optimized, with the valve 22 being opened as the desired characteristic of the fracture 34 reaches its maximum level.
- the valve 22 can be opened when pressure in the formation 16 near the wellbore 14 is at or above a closure pressure of the fracture 34 (i.e., a pressure at which the fracture begins to close), and at or below a fracture pressure of the formation (i.e., a pressure at which fracturing begins in the formation).
- This method can increase the pressure differential from the formation 16 to the wellbore 14 when the valve 22 is opened, as compared to conventional methods.
- the delay device 20 includes a pyrotechnic fuse 38 and a booster charge 40 in an outer tubular housing 42 .
- the delay device 20 At its upper end (as viewed in FIG. 3 ), the delay device 20 includes a connector 44 for sealingly connecting the delay device to the perforator 18 . At its lower end, the delay device 20 includes another connector 46 for sealingly connecting the delay device to the valve 22 .
- the fuse 38 When the perforator 18 is fired, the fuse 38 is ignited, and burns for a predetermined time. When the fuse 38 has burned to its lower end, the booster charge 40 is ignited, thereby actuating the valve 22 .
- a length of the fuse 38 , a material of the fuse, etc., may be adjusted as needed to provide a desired delay period.
- other types of delay devices may be used within the scope of this disclosure.
- valve 22 is representatively illustrated apart from the remainder of the perforating string 12 .
- the valve 22 depicted in FIG. 4 is similar to the SURGEPROTM valve marketed by Halliburton Energy Services, Inc.
- the valve 22 At its upper end (as viewed in FIG. 4 ), the valve 22 is provided with a connector 48 which connects the valve to the delay device 20 . At its lower end (as viewed in FIG. 4 ), the valve 22 is provided with another connector 50 which connects the valve to the low pressure volume 28 .
- a slidable sleeve 52 is reciprocably disposed in a tubular housing 54 connected between the connectors 48 , 50 . Initially, the sleeve 52 blocks flow through the ports 56 , thereby preventing fluid communication between the wellbore 14 and the low pressure volume 28 .
- a method 70 which can embody principles of this disclosure is representatively illustrated.
- the formation 16 is perforated (step 72 ), fractured or otherwise stimulated (step 74 ), and surged (step 76 ).
- steps 72 - 76 are performed in only a single trip of the perforating string 12 into the wellbore 14 .
- step 72 the perforator 18 is fired, thereby perforating the wellbore 14 and forming the perforations 30 extending outward into the formation 16 . This achieves a level of fluid communication between the wellbore 14 and the formation 16 .
- step 72 may not include perforating the wellbore 14 . Instead, the propellant 26 could be ignited without firing the perforator 18 .
- step 74 fluid 32 flows into the formation 16 from the wellbore 14 due to increased pressure in the wellbore.
- This increased pressure may be due to igniting of the propellant 26 in response to firing the perforator 18 (or igniting the propellant without firing the perforator).
- the increased pressure in the wellbore 14 is preferably greater than a fracture pressure of the formation 16 , so that one or more fractures 34 are formed in the formation.
- step 76 pressure in the wellbore 14 is substantially decreased, for example, by opening the valve 22 to expose the wellbore to the low pressure volume 28 . Pressure may be decreased in the wellbore 14 just after (or as) the fracture(s) 34 have reached their maximum extent in the formation 16 .
- the decreased pressure in the wellbore 14 causes fluid flow 36 back into the wellbore, thereby cleaning, scouring, etc., the fracture(s) 34 and perforations 30 .
- the decreased pressure in the wellbore 14 can be less than the initial formation pressure in the formation 16 near the wellbore.
- stimulating and surging can be performed with a single trip into a wellbore.
- the wellbore can also be perforated in the single trip into the wellbore.
- low pressure formations can be adequately surged after fracturing.
- the above disclosure provides to the art a method 70 of enhancing communication between a wellbore 14 and an earth formation 16 intersected by the wellbore 14 , the formation 16 having a formation pressure.
- the method 70 comprises: fracturing the formation 16 in response to firing a perforator 18 in the wellbore 14 ; and then, a predetermined delay period after firing the perforator 18 , decreasing pressure in the wellbore 14 .
- the pressure in the wellbore 14 may be decreased to less than the formation pressure.
- Decreasing pressure can be initiated while the pressure in the wellbore 14 is greater than the formation pressure.
- a delay device 20 preferably causes the predetermined delay period after firing the perforator 18 .
- the delay device 20 may include an ignitable fuse 38 .
- Decreasing pressure in the wellbore 14 can include opening a valve 22 . Opening the valve 22 can include permitting fluid communication between the wellbore 14 and a low pressure volume 28 .
- the method 70 can include increasing pressure in the wellbore 14 prior to decreasing pressure in the wellbore 14 .
- Increasing pressure in the wellbore 14 can include igniting a propellant 26 in response to firing the perforator 18 .
- Increasing pressure in the wellbore 14 can include fracturing the formation 16 . Decreasing pressure in the wellbore 14 may be performed after fracturing the formation 16 .
- a well system 10 provided by the above disclosure can comprise a perforating string 12 positioned in a wellbore 14 , the perforating string 12 including a perforator 18 , a delay device 20 and a valve 22 .
- the valve 22 actuates and thereby decreases pressure in the wellbore 14 a predetermined delay period after the perforator 18 is fired.
- a propellant 26 may be ignited, which increases pressure in the wellbore 14 .
- the valve 22 may actuate after the increased wellbore pressure fractures a formation 16 .
- the valve 22 may actuate while the increased wellbore pressure is greater than formation pressure.
- the delay device 20 can delay actuation of the valve 22 after the perforator 18 is fired.
- a method 70 of enhancing communication between a wellbore 14 and an earth formation 16 comprising: assembling a perforating string 12 ; and in a single trip of the perforating string into the wellbore 14 : a) perforating the wellbore 14 , b) fracturing the formation 16 by increasing pressure in the wellbore 14 , and c) decreasing pressure in the wellbore 14 by exposing the wellbore to a low pressure volume 28 .
- Increasing pressure in the wellbore 14 can include igniting a propellant 26 in response to perforating the wellbore 14 .
- Increasing pressure in the wellbore 14 may include increasing the wellbore pressure to greater than the formation pressure.
- Decreasing pressure in the wellbore 14 may be initiated while the wellbore pressure is greater than the formation pressure. Decreasing pressure in the wellbore 14 can include opening a valve 22 a predetermined delay period after perforating the wellbore 14 .
- the above disclosure also describes a method 70 of enhancing communication between a wellbore 14 and an earth formation 16 having an initial formation pressure, in which the method 70 includes igniting a propellant 26 in the wellbore 14 , thereby increasing pressure in the wellbore 14 and fracturing the formation 16 , and then decreasing pressure in the wellbore 14 by exposing the wellbore 14 to a low pressure volume 28 .
- the method 70 may include assembling a perforating string 12 , and performing the propellant 26 igniting and pressure decreasing steps in a single trip of the perforating string 12 into the wellbore 14 .
- Increasing pressure in the wellbore 14 can include igniting the propellant 26 in response to perforating the wellbore 14 .
- Increasing pressure in the wellbore 14 may include increasing the wellbore 14 pressure to greater than the formation 16 pressure. Decreasing pressure in the wellbore 14 may be initiated while the wellbore 14 pressure is greater than the formation 16 pressure.
- Decreasing pressure in the wellbore 14 may include opening a valve 22 a predetermined delay period after increasing pressure in the wellbore 14 .
- a method 70 of enhancing communication between a wellbore 14 and an earth formation 16 intersected by the wellbore 14 can include forming a fracture 34 in the formation 16 ; and permitting communication between the wellbore 14 and a low pressure volume 28 in response to a desired characteristic of the fracture 34 being maximized.
- the desired characteristic may be chosen from a group comprising length, width, conductivity, and reduced skin.
- Permitting communication can be performed while pressure in the formation 16 proximate the wellbore 14 is at least about a closure pressure of the fracture.
- Permitting communication can further be performed while the pressure in the formation 16 proximate the wellbore 14 is no more than about a fracture pressure of the formation 16 .
- Permitting communication can include further comprises decreasing pressure in the wellbore 14 to less than a formation pressure of the formation 16 .
- Permitting communication may be initiated while pressure in the wellbore 14 is greater than a formation pressure of the formation 16 .
- a delay device 20 may produce a predetermined delay period between initiating the fracture 34 and permitting communication between the wellbore 14 and the low pressure volume 28 .
- the delay device 20 may comprise an ignitable fuse 38 .
- Permitting communication can comprise opening a valve 22 .
- Forming the fracture 34 can include increasing pressure in the wellbore 14 prior to permitting communication between the wellbore 14 and the low pressure volume 28 .
- Forming the fracture 34 can be performed in response to igniting a propellant 26 in the wellbore 14 . Igniting the propellant 26 may be performed in response to firing a perforator 18 .
- the method can also include assembling a perforating string 12 ; and perforating the wellbore 14 , and performing the fracture 34 forming and communication permitting steps, in a single trip of the perforating string 12 into the wellbore 14 .
- a method 70 of enhancing communication between a wellbore 14 and an earth formation 16 can include forming a fracture 34 in the formation 16 ; and then, while pressure in the formation 16 proximate the wellbore 14 is at least about a closure pressure of the fracture 34 , decreasing pressure in the wellbore 14 by exposing the wellbore 14 to a low pressure volume 28 .
- Decreasing pressure in the wellbore 14 can be performed while the pressure in the formation 16 proximate the wellbore 14 is no greater than a fracture pressure of the formation 16 .
- Decreasing pressure in the wellbore 14 may be performed in response to a desired characteristic of the fracture 34 being maximized.
- the desired characteristic may be chosen from a group comprising length, width, conductivity, and reduced skin.
- Decreasing pressure can include decreasing pressure in the wellbore 14 to less than a formation pressure of the formation 16 .
- Decreasing pressure in the wellbore 14 may be initiated while the pressure in the wellbore 14 is greater than a formation pressure of the formation 16 .
- a delay device 20 may produce a predetermined delay period between initiating the fracture 34 and decreasing pressure in the wellbore 16 .
- the delay device 20 may comprise an ignitable fuse 38 .
- Decreasing pressure in the wellbore 14 may comprise opening a valve 22 .
- the method 70 may also include: assembling a perforating string 12 ; and perforating the wellbore 14 , and performing the fracture 34 forming and pressure decreasing steps, in a single trip of the perforating string 12 into the wellbore 14 .
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Abstract
A method of enhancing communication between a wellbore and an earth formation intersected by the wellbore can include forming a fracture in the formation, and permitting communication between the wellbore and a low pressure volume in response to a desired characteristic of the fracture being maximized. Another method of enhancing communication between a wellbore and an earth formation can include forming a fracture in the formation, and then, while pressure in the formation proximate the wellbore is at least about a closure pressure of the fracture, decreasing pressure in the wellbore by exposing the wellbore to a low pressure volume.
Description
- This disclosure relates generally to equipment utilized and operations performed in conjunction with a subterranean well and, in an example described below, more particularly provides for stimulating and surging an earth formation.
- It is increasingly important to provide economical and efficient ways to exploit resources, so that the resources are not wasted. One way of achieving this goal is to provide for enhanced fluid communication between wellbores and formations penetrated by those wellbores.
- Stimulating formations and reducing restrictions to flow between wellbores and formations can promote such enhanced fluid communication. Therefore, it will be appreciated that improvements are needed in this art.
- In the disclosure below, systems and methods are provided which bring improvements to the art of improving fluid communication between a formation and a wellbore. One example is described below in which only a single trip of a perforating string into a wellbore can accomplish perforating, stimulating and surging of a formation. Another example is described below in which surging of the formation occurs while increased pressure is applied to the formation.
- In one aspect, this disclosure provides to the art a method of enhancing communication between a wellbore and an earth formation intersected by the wellbore. The method can be performed by fracturing the formation in response to firing a perforator in the wellbore, and then, a predetermined delay period after firing the perforator, decreasing pressure in the wellbore. In some examples, pressure in the wellbore may be decreased to less than formation pressure.
- In another aspect, this disclosure describes an example of a method of enhancing communication between a wellbore and an earth formation, with the method including assembling a perforating string and, in a single trip of the perforating string into the wellbore: a) perforating the wellbore, b) fracturing the formation by increasing pressure in the wellbore, and c) decreasing pressure in the wellbore by exposing the wellbore to a low pressure volume.
- In a further aspect, a method can include igniting a propellant in a wellbore, thereby increasing pressure in the wellbore and fracturing the formation, and then decreasing pressure in the wellbore by exposing the wellbore to a low pressure volume. The wellbore is not necessarily perforated in this method.
- A still further aspect involves a method of enhancing communication between a wellbore and an earth formation having an initial formation pressure, with the method including increasing pressure in the wellbore and thereby fracturing the formation, and then, while the wellbore pressure is greater than the formation pressure, decreasing pressure in the wellbore by exposing the wellbore to a low pressure volume.
- A method of enhancing communication between a wellbore and an earth formation intersected by the wellbore can include forming a fracture in the formation, and permitting communication between the wellbore and a low pressure volume in response to a desired characteristic of the fracture being maximized.
- Another method of enhancing communication between a wellbore and an earth formation can include forming a fracture in the formation; and then, while pressure in the formation proximate the wellbore is at least about a closure pressure of the fracture, decreasing pressure in the wellbore by exposing the wellbore to a low pressure volume.
- These and other features, advantages and benefits will become apparent to one of ordinary skill in the art upon careful consideration of the detailed description of representative examples below and the accompanying drawings, in which similar elements are indicated in the various figures using the same reference numbers.
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FIG. 1 is a schematic partially cross-sectional view of a well system and associated method which can embody principles of the present disclosure. -
FIG. 2 is an enlarged scale schematic cross-sectional view of perforations extending into an earth formation in the system and method ofFIG. 1 . -
FIG. 3 is a schematic partially cross-sectional view of a delay device which may be used in the system and method ofFIG. 1 . -
FIG. 4 is a schematic partially cross-sectional view of a valve which may be used in the system and method ofFIG. 1 . -
FIG. 5 is a schematic flow chart for the method. - Representatively illustrated in
FIG. 1 is awell system 10 and associated method which can embody principles of this disclosure. Of course, the scope of this disclosure is not limited only to the specific examples of thewell system 10 and method described herein, since other well systems and methods can be used, if desired. - In the example depicted in
FIG. 1 , a perforatingstring 12 is positioned in a section of awellbore 14 which intersects anearth formation 16. The perforatingstring 12 includes aperforator 18, adelay device 20 and avalve 22. - The
perforator 18 is illustrated inFIG. 1 as a tubing conveyed perforating gun (e.g., having perforating charges contained within a tubular gun housing, etc.). However, other types of perforators (such as, wireline-conveyed perforators, etc.) may be used instead. - A
firing head 24 may be used to control firing of theperforator 18. Any type of firing head (mechanical, electrical, telemetry controlled, etc.) which is compatible with theperforator 18 can be used. - A
propellant 26 is associated with theperforator 18, so that the propellant is ignited in response to the perforator being fired. One suitable propellant sleeve is included with a perforating gun and marketed as the STIMGUN™ by Halliburton Energy Services, Inc. of Houston, Tex. USA. - The STIMGUN™ could be used for the
perforator 18 andpropellant 26 in the perforatingstring 12. However, other types of propellants and perforators can be used instead, in keeping with the scope of this disclosure (for example, the propellant could be disposed inside the perforator, otherwise shaped or configured, etc.). - The
delay device 20 provides a predetermined delay period between theperforator 18 firing and thevalve 22 actuating. In an example described more fully below, thedelay device 20 comprises a pyrotechnic fuse which is ignited when theperforator 18 is fired. - When the fuse is burned to its end, another propellant is ignited to cause the
valve 22 to open. However, other types ofdelay devices 20, and other methods of actuating the valve 22 a predetermined delay period after firing theperforator 18, may be used in keeping with the scope of this disclosure. - The
valve 22 controls fluid communication between thewellbore 14 and alow pressure volume 28. When thevalve 22 is actuated, it exposes thewellbore 14 to thelow pressure volume 28, thereby decreasing pressure in the wellbore. - The
volume 28 is “low pressure” in that it is preferably substantially less than formation pressure in theformation 16 near thewellbore 14. The pressure in thevolume 28 may be less than, greater than, or equal to, pressure in thewellbore 14 at the time the perforatingstring 12 is installed. - As depicted in
FIG. 1 , thevolume 28 comprises an empty, sealed tubular housing having about atmospheric pressure therein. However, other types of low pressure volumes may be used instead, in keeping with the scope of this disclosure. - By appropriately sizing the
volume 28 and adjusting the pressure therein, a desired pressure decrease in thewellbore 14 can be obtained in response to actuating thevalve 22. A suitable valve for use in the perforatingstring 12 is the SURGEPRO™ marketed by Halliburton Energy Services, Inc., although other valves may be used and still remain within the scope of this disclosure. - SURGEPRO™ is also the name of a software package which can be used to determine a number of
valves 22, and a number and size of thevolume 28 to achieve a desired pressure decrease in thewellbore 14, and a corresponding pressure differential from theformation 16 to the wellbore. Another software package (PULSFRAC™, marketed by Halliburton Energy Services, Inc.) can be used to determine the amount ofpropellant 26 and the timing of the delay before thevalve 22 is opened, to achieve the desired pressure differential from theformation 16 to thewellbore 14. - When the
perforator 18 is fired,perforations 30 are formed extending outward from thewellbore 14, as schematically depicted inFIG. 2 . As thepropellant 26 burns, pressure is increased in thewellbore 14, which causes fluid flow (indicated byarrows 32 inFIG. 2 ) outward into theformation 16. - If the increased pressure in the
wellbore 14 is sufficiently great, one ormore fractures 34 may be formed in theformation 16, thereby providing for increased surface area exposure of the formation to theperforations 30. Eventually, the pressure in thewellbore 14 will maximize, and will no longer be great enough to cause fracturing of theformation 16. - At that point, it will be beneficial to substantially decrease pressure in the
wellbore 14, so that fluid will flow back into the wellbore from the formation 16 (indicated byarrows 36 inFIG. 2 ), thereby backwashing, cleaning, scouring, and/or surging, etc., thefracture 34 andperforations 30. This will provide for enhanced fluid communication between theformation 16 and thewellbore 14 by removing perforating debris, scouring any compacted areas around theperforations 30, preparing theformation 16 for subsequent stimulation or conformance treatments, etc. - If the
formation 16 is under-pressurized, low pressure, significantly depleted, etc., thesystem 10 can be used to provide sufficient differential pressure to accomplish the surging, cleaning, etc. discussed above. In the past, it was difficult with low pressure formations to achieve a sufficiently underbalanced condition in a wellbore to provide a large pressure differential to cause substantial inward flow from the formation to the wellbore. - However, in the
system 10, thevalve 22 is opened when the pressure in thewellbore 14 has been increased to greater than the initial formation pressure near the wellbore. In this manner, when pressure is decreased in the wellbore 14 (by exposing the wellbore to the low pressure volume 28), a relatively large pressure differential will be created to causesubstantial fluid flow 36 from theformation 16 into the wellbore. Preferably, thevalve 22 is opened just after thefracture 34 has ceased growing (thereby obtaining a maximum extent of the fracture into the formation 16), but other timings may be used within the scope of this disclosure. - The
delay device 20 provides the predetermined delay period between firing theperforator 18 and opening thevalve 22. It is contemplated that a delay period of a few hundred milliseconds would be appropriate, but other delay periods can be used, if desired. - Modeling software, such as the SURGEPRO™ system marketed by Halliburton Energy Services, Inc., may be used to determine optimum characteristics for the
perforator 18,propellant 26,delay 20 andlow pressure volume 28 to achieve desired perforation, stimulation and surging results. Of course, other means of designing the sizes, number, materials, etc., of the various components of the perforatingstring 12 may be used within the scope of this disclosure, and each operation would preferably be independently configured to achieve optimum results. - In one example, the SURGEPRO™ software is used in conjunction with another system marketed by Halliburton Energy Services, Inc. as the PULSFRAC™ system. In this example, the PULSFRAC™ software predicts near wellbore stimulation resulting from propellant ignition in a wellbore, and the SURGEPRO™ software predicts dynamic surges with modeling of perforating string volumes, surge valves, surge chambers, etc. The PULSFRAC™ and SURGEPRO™ software both incorporate models of the perforating string, wellbore geometry and formation characteristics.
- The PULSFRAC™ software can be used to determine the amount of propellant needed to produce maximum fracturing without damage to downhole equipment. The PULSFRAC™ software can also plot fracture length, width, conductivity and skin, versus time.
- For a given situation (e.g., a particular perforating
string 12, wellbore 14,formation 16, etc.), the PULSFRAC™ software can indicate the amount of time from igniting thepropellant 26 to thefracture 34 achieving a greatest characteristic (e.g., length, width, conductivity, minimized skin, etc.). - The SURGEPRO™ software can then be used to determine the optimum size of the
low pressure volume 28 to achieve a desired pressure reduction in the wellbore 14 (e.g., for optimized surging of theformation 16 and cleaning of theperforations 30, etc.), with a delay between the perforator 18 being fired and thevalve 22 being opened. This delay corresponds to the amount of time determined by the PULSFRAC™ software for the desired characteristic of the fracture 34 (e.g., length, width, conductivity, minimized skin, etc.) to reach its maximum level. - Thus, both stimulation and surging can be optimized, with the
valve 22 being opened as the desired characteristic of thefracture 34 reaches its maximum level. In one example, thevalve 22 can be opened when pressure in theformation 16 near thewellbore 14 is at or above a closure pressure of the fracture 34 (i.e., a pressure at which the fracture begins to close), and at or below a fracture pressure of the formation (i.e., a pressure at which fracturing begins in the formation). - This method can increase the pressure differential from the
formation 16 to thewellbore 14 when thevalve 22 is opened, as compared to conventional methods. - Referring additionally now to
FIG. 3 , an example of thedelay device 20 is representatively illustrated, apart from the remainder of the perforatingstring 12. In this example, thedelay device 20 includes a pyrotechnic fuse 38 and a booster charge 40 in an outer tubular housing 42. - At its upper end (as viewed in
FIG. 3 ), thedelay device 20 includes a connector 44 for sealingly connecting the delay device to theperforator 18. At its lower end, thedelay device 20 includes another connector 46 for sealingly connecting the delay device to thevalve 22. - When the
perforator 18 is fired, the fuse 38 is ignited, and burns for a predetermined time. When the fuse 38 has burned to its lower end, the booster charge 40 is ignited, thereby actuating thevalve 22. - A length of the fuse 38, a material of the fuse, etc., may be adjusted as needed to provide a desired delay period. Furthermore, other types of delay devices may be used within the scope of this disclosure.
- Referring additionally now to
FIG. 4 , an example of thevalve 22 is representatively illustrated apart from the remainder of the perforatingstring 12. Thevalve 22 depicted inFIG. 4 is similar to the SURGEPRO™ valve marketed by Halliburton Energy Services, Inc. - At its upper end (as viewed in
FIG. 4 ), thevalve 22 is provided with aconnector 48 which connects the valve to thedelay device 20. At its lower end (as viewed inFIG. 4 ), thevalve 22 is provided with anotherconnector 50 which connects the valve to thelow pressure volume 28. - A
slidable sleeve 52 is reciprocably disposed in atubular housing 54 connected between theconnectors sleeve 52 blocks flow through theports 56, thereby preventing fluid communication between the wellbore 14 and thelow pressure volume 28. - However, when the booster charge 40 of the
delay device 20 is ignited, a detonatingcord 58 and propellant 60 in thevalve 22 are ignited, thereby increasing pressure above thesleeve 52, forcing the sleeve to displace downward and open theports 56. The resulting fluid communication between the wellbore 14 and thelow pressure volume 28 decreases the pressure in the wellbore, as discussed above. - Referring additionally now to
FIG. 5 , a method 70 which can embody principles of this disclosure is representatively illustrated. In the method 70, theformation 16 is perforated (step 72), fractured or otherwise stimulated (step 74), and surged (step 76). Preferably, these steps 72-76 are performed in only a single trip of the perforatingstring 12 into thewellbore 14. - In step 72, the
perforator 18 is fired, thereby perforating thewellbore 14 and forming theperforations 30 extending outward into theformation 16. This achieves a level of fluid communication between the wellbore 14 and theformation 16. - If the
perforations 30 already exist, then step 72 may not include perforating thewellbore 14. Instead, thepropellant 26 could be ignited without firing theperforator 18. - In step 74,
fluid 32 flows into theformation 16 from thewellbore 14 due to increased pressure in the wellbore. This increased pressure may be due to igniting of thepropellant 26 in response to firing the perforator 18 (or igniting the propellant without firing the perforator). The increased pressure in thewellbore 14 is preferably greater than a fracture pressure of theformation 16, so that one ormore fractures 34 are formed in the formation. - In step 76, pressure in the
wellbore 14 is substantially decreased, for example, by opening thevalve 22 to expose the wellbore to thelow pressure volume 28. Pressure may be decreased in thewellbore 14 just after (or as) the fracture(s) 34 have reached their maximum extent in theformation 16. - The decreased pressure in the
wellbore 14 causesfluid flow 36 back into the wellbore, thereby cleaning, scouring, etc., the fracture(s) 34 andperforations 30. Preferably, but not necessarily, the decreased pressure in thewellbore 14 can be less than the initial formation pressure in theformation 16 near the wellbore. - Although the SURGEPRO™ and PULSFRAC™ software packages are mentioned above as being used to configure the components of the perforating string 12 (e.g., the number of
valves 22 andlow pressure volumes 28, the size of the low pressure volume, the delay betweenpropellant 26 igniting and valve opening, etc.), it should be clearly understood that other software packages, and other means of determining the various characteristics of the perforating string, may be used in keeping with the scope of this disclosure. - Although certain examples described above use the
delay device 20 in order to open thevalve 22 as thefracture 34 characteristic is maximized, in other examples it may be desired to use other timings. For example, it could be advantageous to reduce the delay, in order to increase the pressure differential from theformation 16 to thewellbore 14 and thereby optimize surging, at the expense of a less than optimum fracture characteristic. - It may now be fully appreciated that this disclosure provides several advancements to the art of enhancing communication between a wellbore and a formation intersected by the wellbore. In the examples described above, stimulating and surging can be performed with a single trip into a wellbore. The wellbore can also be perforated in the single trip into the wellbore. Furthermore, low pressure formations can be adequately surged after fracturing.
- The above disclosure provides to the art a method 70 of enhancing communication between a wellbore 14 and an
earth formation 16 intersected by thewellbore 14, theformation 16 having a formation pressure. The method 70 comprises: fracturing theformation 16 in response to firing aperforator 18 in thewellbore 14; and then, a predetermined delay period after firing theperforator 18, decreasing pressure in thewellbore 14. The pressure in thewellbore 14 may be decreased to less than the formation pressure. - Decreasing pressure can be initiated while the pressure in the
wellbore 14 is greater than the formation pressure. - A
delay device 20 preferably causes the predetermined delay period after firing theperforator 18. Thedelay device 20 may include an ignitable fuse 38. - Decreasing pressure in the
wellbore 14 can include opening avalve 22. Opening thevalve 22 can include permitting fluid communication between the wellbore 14 and alow pressure volume 28. - The method 70 can include increasing pressure in the
wellbore 14 prior to decreasing pressure in thewellbore 14. Increasing pressure in thewellbore 14 can include igniting apropellant 26 in response to firing theperforator 18. - Increasing pressure in the
wellbore 14 can include fracturing theformation 16. Decreasing pressure in thewellbore 14 may be performed after fracturing theformation 16. - A
well system 10 provided by the above disclosure can comprise a perforatingstring 12 positioned in awellbore 14, the perforatingstring 12 including aperforator 18, adelay device 20 and avalve 22. Thevalve 22 actuates and thereby decreases pressure in the wellbore 14 a predetermined delay period after theperforator 18 is fired. - In response to the
perforator 18 being fired, apropellant 26 may be ignited, which increases pressure in thewellbore 14. Thevalve 22 may actuate after the increased wellbore pressure fractures aformation 16. Thevalve 22 may actuate while the increased wellbore pressure is greater than formation pressure. - The
delay device 20 can delay actuation of thevalve 22 after theperforator 18 is fired. - Also described above is a method 70 of enhancing communication between a wellbore 14 and an
earth formation 16, with the method 70 comprising: assembling a perforatingstring 12; and in a single trip of the perforating string into the wellbore 14: a) perforating thewellbore 14, b) fracturing theformation 16 by increasing pressure in thewellbore 14, and c) decreasing pressure in thewellbore 14 by exposing the wellbore to alow pressure volume 28. - Increasing pressure in the
wellbore 14 can include igniting apropellant 26 in response to perforating thewellbore 14. Increasing pressure in thewellbore 14 may include increasing the wellbore pressure to greater than the formation pressure. - Decreasing pressure in the
wellbore 14 may be initiated while the wellbore pressure is greater than the formation pressure. Decreasing pressure in thewellbore 14 can include opening a valve 22 a predetermined delay period after perforating thewellbore 14. - The above disclosure also describes a method 70 of enhancing communication between a wellbore 14 and an
earth formation 16 having an initial formation pressure, in which the method 70 includes igniting apropellant 26 in thewellbore 14, thereby increasing pressure in thewellbore 14 and fracturing theformation 16, and then decreasing pressure in thewellbore 14 by exposing thewellbore 14 to alow pressure volume 28. - The method 70 may include assembling a perforating
string 12, and performing thepropellant 26 igniting and pressure decreasing steps in a single trip of the perforatingstring 12 into thewellbore 14. Increasing pressure in thewellbore 14 can include igniting thepropellant 26 in response to perforating thewellbore 14. - Increasing pressure in the
wellbore 14 may include increasing thewellbore 14 pressure to greater than theformation 16 pressure. Decreasing pressure in thewellbore 14 may be initiated while thewellbore 14 pressure is greater than theformation 16 pressure. - Decreasing pressure in the
wellbore 14 may include opening a valve 22 a predetermined delay period after increasing pressure in thewellbore 14. - A method 70 of enhancing communication between a wellbore 14 and an
earth formation 16 intersected by thewellbore 14 can include forming afracture 34 in theformation 16; and permitting communication between the wellbore 14 and alow pressure volume 28 in response to a desired characteristic of thefracture 34 being maximized. - The desired characteristic may be chosen from a group comprising length, width, conductivity, and reduced skin.
- Permitting communication can be performed while pressure in the
formation 16 proximate thewellbore 14 is at least about a closure pressure of the fracture. - Permitting communication can further be performed while the pressure in the
formation 16 proximate thewellbore 14 is no more than about a fracture pressure of theformation 16. - Permitting communication can include further comprises decreasing pressure in the
wellbore 14 to less than a formation pressure of theformation 16. - Permitting communication may be initiated while pressure in the
wellbore 14 is greater than a formation pressure of theformation 16. - A
delay device 20 may produce a predetermined delay period between initiating thefracture 34 and permitting communication between the wellbore 14 and thelow pressure volume 28. Thedelay device 20 may comprise an ignitable fuse 38. - Permitting communication can comprise opening a
valve 22. - Forming the
fracture 34 can include increasing pressure in thewellbore 14 prior to permitting communication between the wellbore 14 and thelow pressure volume 28. - Forming the
fracture 34 can be performed in response to igniting apropellant 26 in thewellbore 14. Igniting thepropellant 26 may be performed in response to firing aperforator 18. - The method can also include assembling a perforating
string 12; and perforating thewellbore 14, and performing thefracture 34 forming and communication permitting steps, in a single trip of the perforatingstring 12 into thewellbore 14. - A method 70 of enhancing communication between a wellbore 14 and an
earth formation 16 can include forming afracture 34 in theformation 16; and then, while pressure in theformation 16 proximate thewellbore 14 is at least about a closure pressure of thefracture 34, decreasing pressure in thewellbore 14 by exposing thewellbore 14 to alow pressure volume 28. - Decreasing pressure in the
wellbore 14 can be performed while the pressure in theformation 16 proximate thewellbore 14 is no greater than a fracture pressure of theformation 16. - Decreasing pressure in the
wellbore 14 may be performed in response to a desired characteristic of thefracture 34 being maximized. The desired characteristic may be chosen from a group comprising length, width, conductivity, and reduced skin. - Decreasing pressure can include decreasing pressure in the
wellbore 14 to less than a formation pressure of theformation 16. - Decreasing pressure in the
wellbore 14 may be initiated while the pressure in thewellbore 14 is greater than a formation pressure of theformation 16. - A
delay device 20 may produce a predetermined delay period between initiating thefracture 34 and decreasing pressure in thewellbore 16. Thedelay device 20 may comprise an ignitable fuse 38. - Decreasing pressure in the
wellbore 14 may comprise opening avalve 22. - The method 70 may also include: assembling a perforating
string 12; and perforating thewellbore 14, and performing thefracture 34 forming and pressure decreasing steps, in a single trip of the perforatingstring 12 into thewellbore 14. - It is to be understood that the various examples described above may be utilized in various orientations, such as inclined, inverted, horizontal, vertical, etc., and in various configurations, without departing from the principles of the present disclosure. The embodiments illustrated in the drawings are depicted and described merely as examples of useful applications of the principles of the disclosure, which are not limited to any specific details of these embodiments.
- In the above description of the representative examples of the disclosure, directional terms, such as “above,” “below,” “upper,” “lower,” etc., are used for convenience in referring to the accompanying drawings.
- Of course, a person skilled in the art would, upon a careful consideration of the above description of representative embodiments, readily appreciate that many modifications, additions, substitutions, deletions, and other changes may be made to these specific embodiments, and such changes are within the scope of the principles of the present disclosure. Accordingly, the foregoing detailed description is to be clearly understood as being given by way of illustration and example only, the spirit and scope of the present invention being limited solely by the appended claims and their equivalents.
Claims (25)
1. A method of enhancing communication between a wellbore and an earth formation intersected by the wellbore, the method comprising:
forming a fracture in the formation; and
permitting communication between the wellbore and a low pressure volume in response to a desired characteristic of the fracture being maximized.
2. The method of claim 1 , wherein the desired characteristic is chosen from a group comprising length, width, conductivity, and reduced skin.
3. The method of claim 1 , wherein permitting communication is performed while pressure in the formation proximate the wellbore is at least about a closure pressure of the fracture.
4. The method of claim 3 , wherein permitting communication is further performed while the pressure in the formation proximate the wellbore is no more than about a fracture pressure of the formation.
5. The method of claim 1 , wherein permitting communication further comprises decreasing pressure in the wellbore to less than a formation pressure of the formation.
6. The method of claim 1 , wherein permitting communication is initiated while pressure in the wellbore is greater than a formation pressure of the formation.
7. The method of claim 1 , wherein a delay device produces a predetermined delay period between initiating the fracture and permitting communication.
8. The method of claim 7 , wherein the delay device comprises an ignitable fuse.
9. The method of claim 1 , wherein permitting communication further comprises opening a valve.
10. The method of claim 1 , wherein forming the fracture further comprises increasing pressure in the wellbore prior to permitting communication.
11. The method of claim 1 , wherein forming the fracture is performed in response to igniting a propellant in the wellbore.
12. The method of claim 11 , wherein igniting the propellant is performed in response to firing a perforator.
13. The method of claim 1 , further comprising:
assembling a perforating string; and
perforating the wellbore, and performing the fracture forming and communication permitting steps in a single trip of the perforating string into the wellbore.
14. A method of enhancing communication between a wellbore and an earth formation, the method comprising:
forming a fracture in the formation; and
then, while pressure in the formation proximate the wellbore is at least about a closure pressure of the fracture, decreasing pressure in the wellbore by exposing the wellbore to a low pressure volume.
15. The method of claim 14 , wherein decreasing pressure in the wellbore is performed while the pressure in the formation proximate the wellbore is no greater than a fracture pressure of the formation.
16. The method of claim 14 , wherein decreasing pressure in the wellbore is performed in response to a desired characteristic of the fracture being maximized.
17. The method of claim 16 , wherein the desired characteristic is chosen from a group comprising length, width, conductivity, and reduced skin.
18. The method of claim 14 , wherein decreasing pressure further comprises decreasing pressure in the wellbore to less than a formation pressure of the formation.
19. The method of claim 14 , wherein decreasing pressure in the wellbore is initiated while the pressure in the wellbore is greater than a formation pressure of the formation.
20. The method of claim 14 , wherein a delay device produces a predetermined delay period between initiating the fracture and decreasing pressure in the wellbore.
21. The method of claim 20 , wherein the delay device comprises an ignitable fuse.
22. The method of claim 14 , wherein decreasing pressure in the wellbore further comprises opening a valve.
23. The method of claim 14 , wherein forming the fracture is performed in response to igniting a propellant in the wellbore.
24. The method of claim 23 , wherein igniting the propellant is performed in response to firing a perforator.
25. The method of claim 14 , further comprising:
assembling a perforating string; and
perforating the wellbore, and performing the fracture forming and pressure decreasing steps, in a single trip of the perforating string into the wellbore.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/007,815 US20120181031A1 (en) | 2011-01-17 | 2011-01-17 | Stimulating and surging an earth formation |
AU2012200070A AU2012200070B2 (en) | 2011-01-17 | 2012-01-05 | Stimulating and surging an earth formation |
ECSP12011592 ECSP12011592A (en) | 2011-01-17 | 2012-01-11 | STIMULATION AND PISTONE OF A GROUND FORMATION |
ARP120100105A AR084837A1 (en) | 2011-01-17 | 2012-01-12 | STIMULATION AND PISTONE OF A TERREA TRAINING |
BR102012001012-7A BR102012001012A2 (en) | 2011-01-17 | 2012-01-16 | METHOD FOR INCREASING COMMUNICATION BETWEEN A WELL HOLE AND EARTH FORMATION |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/007,815 US20120181031A1 (en) | 2011-01-17 | 2011-01-17 | Stimulating and surging an earth formation |
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US20120181031A1 true US20120181031A1 (en) | 2012-07-19 |
Family
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Family Applications (1)
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US13/007,815 Abandoned US20120181031A1 (en) | 2011-01-17 | 2011-01-17 | Stimulating and surging an earth formation |
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US (1) | US20120181031A1 (en) |
AR (1) | AR084837A1 (en) |
AU (1) | AU2012200070B2 (en) |
BR (1) | BR102012001012A2 (en) |
EC (1) | ECSP12011592A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10655442B2 (en) * | 2012-12-28 | 2020-05-19 | Schlumberger Technology Corporation | Method for wellbore stimulation optimization |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040231840A1 (en) * | 2000-03-02 | 2004-11-25 | Schlumberger Technology Corporation | Controlling Transient Pressure Conditions In A Wellbore |
US20090272527A1 (en) * | 2006-04-25 | 2009-11-05 | Cuthill David A | Method and Apparatus for Perforating a Casing and Producing Hydrocarbons |
US20100133005A1 (en) * | 2008-12-01 | 2010-06-03 | Matthew Robert George Bell | Method for the Enhancement of Dynamic Underbalanced Systems and Optimization of Gun Weight |
-
2011
- 2011-01-17 US US13/007,815 patent/US20120181031A1/en not_active Abandoned
-
2012
- 2012-01-05 AU AU2012200070A patent/AU2012200070B2/en not_active Ceased
- 2012-01-11 EC ECSP12011592 patent/ECSP12011592A/en unknown
- 2012-01-12 AR ARP120100105A patent/AR084837A1/en active IP Right Grant
- 2012-01-16 BR BR102012001012-7A patent/BR102012001012A2/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040231840A1 (en) * | 2000-03-02 | 2004-11-25 | Schlumberger Technology Corporation | Controlling Transient Pressure Conditions In A Wellbore |
US20090272527A1 (en) * | 2006-04-25 | 2009-11-05 | Cuthill David A | Method and Apparatus for Perforating a Casing and Producing Hydrocarbons |
US20100133005A1 (en) * | 2008-12-01 | 2010-06-03 | Matthew Robert George Bell | Method for the Enhancement of Dynamic Underbalanced Systems and Optimization of Gun Weight |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10655442B2 (en) * | 2012-12-28 | 2020-05-19 | Schlumberger Technology Corporation | Method for wellbore stimulation optimization |
Also Published As
Publication number | Publication date |
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AU2012200070B2 (en) | 2015-01-29 |
ECSP12011592A (en) | 2012-07-31 |
AU2012200070A1 (en) | 2012-08-02 |
BR102012001012A2 (en) | 2014-02-04 |
AR084837A1 (en) | 2013-06-26 |
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Owner name: HALLIBURTON ENERGY SERVICES, INC., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LE, CAM;MARTINEZ, ANGEL S.;SIGNING DATES FROM 20110308 TO 20110311;REEL/FRAME:026005/0186 |
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