WO2015048910A1 - Methods, strings and tools to enhance wellbore fracturing - Google Patents
Methods, strings and tools to enhance wellbore fracturing Download PDFInfo
- Publication number
- WO2015048910A1 WO2015048910A1 PCT/CA2014/050965 CA2014050965W WO2015048910A1 WO 2015048910 A1 WO2015048910 A1 WO 2015048910A1 CA 2014050965 W CA2014050965 W CA 2014050965W WO 2015048910 A1 WO2015048910 A1 WO 2015048910A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cement
- port
- tubular
- external structure
- diffuser
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 31
- 239000012530 fluid Substances 0.000 claims abstract description 60
- 230000037361 pathway Effects 0.000 claims abstract description 50
- 230000004323 axial length Effects 0.000 claims abstract description 24
- 239000004568 cement Substances 0.000 claims description 195
- 239000000835 fiber Substances 0.000 claims description 46
- 206010017076 Fracture Diseases 0.000 claims description 35
- 238000009434 installation Methods 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 13
- 239000000945 filler Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 239000011435 rock Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 230000015556 catabolic process Effects 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 230000008595 infiltration Effects 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000006731 degradation reaction Methods 0.000 claims 2
- 239000011800 void material Substances 0.000 claims 2
- 238000011282 treatment Methods 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229920006328 Styrofoam Polymers 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/063—Valve or closure with destructible element, e.g. frangible disc
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices, or the like for cementing casings into boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
Definitions
- the present invention relates to methods, strings and tools for fracturing a wellbore. Background
- fracturing can be difficult.
- the cement blocks the annulus and, when ported tubulars are employed, the cement inhibits the fracture fluid from passing from the port of the ported tubular forming the well liner to the wellbore wall. As such, the fracture is often difficult to achieve.
- fracturing In fracturing, it has been found that fracturing can be enhanced by having fracture complexity and fracturing into natural weaknesses. Complexity is where plural fractures, including for example, both primary and secondary fractures, are generated along a single fracture site in a wellbore. Natural fractures are where a fracture opens via a natural weakness in the wellbore wall. Fracture complexity and natural fracturing has been difficult to achieve in cemented wells, even where a cement diffuser, as described in the above-noted US Patents, is employed.
- a tubular installation in place in a borehole, the tubular installation creating an annular space between the tubular installation and a wall of the borehole, the tubular installation comprising: a tubular including a wall having an inner surface and an outer surface; a port extending through the wall, the port including an upper end wall and a lower end wall the distance between the upper end wall and the lower end wall defining the open axial length of the port; and an external structure carried on the outer surface, the external structure overlying at least a portion of the axial length and extending axially from the port beyond at least one of the upper end wall and the lower end wall and remaining in place overlying at least a portion of the axial length when the port is opened.
- a wellbore tubular comprising: a wall having a first end, an opposite end, an inner surface and an outer surface; a port extending through the wall, the port including an upper end wall and a lower end wall, the distance between the upper end wall and the lower end wall defining the open axial length of the port; and an external structure carried on the outer surface, the external structure overlying at least a portion of the axial length and extending axially from the port beyond at least one of the upper end wall and the lower end wall, the external structure operable to create a pathway through hardened cement for passage of fracturing fluid from the port axially along the outer surface away from the port and toward the first end.
- a method for fracturing a wellbore comprising: injecting fluid through a tubing string and out through a port into a cemented annulus between the tubing string and a wellbore wall, the fluid following a pathway through the cemented annulus, the pathway extending longitudinally away from the port and into contact with the wellbore wall.
- Figure 1 A is a schematic sectional view along a portion of a well bore with a ported tubular therein.
- Figure B is a sectional view along line l-l of Figure 1 A.
- Figure 2 is a plan view of a cement diffuser plate useful in the present invention.
- Figure 3 is a perspective view of a cement diffuser installed on a wellbore tubular.
- Figure 4 is a sectional view of a cement diffuser installed on a tubular. Reference may be made to line ll-ll of Figure 3 for orientation of the section through the cement diffuser and tubular wall.
- Figure 5A is a schematic sectional view along a portion of another wellbore with a ported tubular therein.
- Figure 5B and 5C are perspective views of further wellbore tubulars including cement diffusers.
- Figure 6 is a schematic sectional view of a string installed in a well. Description of Various Embodiments
- a ported tubular 12 that facilitates wellbore fracturing in a cemented wellbore.
- tubular 12 facilitates fracturing by promoting complex fracturing and/or by facilitating access of fracturing fluid to natural weaknesses in a cemented installation.
- the ported tubular 12 can be cemented in place in a wellbore, as defined by wellbore wall 14, wherein cement C resides and is allowed to set in an annular area 18 between the outer surface 12a of the tubular and wellbore wall 14.
- the ported tubular 12 includes an external structure that is a cement diffuser 10.
- the cement diffuser is carried on outer surface 12a of the ported tubular, When in place in a cemented well, cement diffuser 10 creates a pathway P through the cement annulus both radially adjacent and extending axially of the port 16 of the tubular.
- the pathway P is formed within the cement diffuser.
- the external structure can create an area of the annulus generally free of set cement by blocking infiltration of the cement, by deforming or degrading to leave a space in the set cement and/or by preventing proper setting of the cement. The pathway follows the position of the cement diffuser.
- the cement diffuser is positioned both radially outwardly of the port and axially away from at least one of the upper and lower limits of the port and, as such, the pathway through the cement extends both radially outwardly and axially beyond the port towards one or both ends of the ported tubular.
- Various external structures can form the cement diffuser.
- materials that prevent infiltration of cement into their inner portions such as a hollow tubular structure, a collection of fibers (a brush, wool, twisted, woven, knit or compressed arrangements, etc.), foam such as sponge or closed cell foam such a styrofoam, degradable or deformable materials, straps, etc. are all useful to form a cement diffuser.
- cement diffuser 10 includes a collection of fibers secured over the port 16 at the outer surface and extending along at least an expanse of the outer surface of tubular 12 axially (aka longitudinally) adjacent port 16.
- the fibers can be metal, synthetic such as of polymers or natural organic materials such as of cellulose, hemp, wood, cotton, etc.
- the collection of fibers is carried along with tubular 12 while running the tubular into a borehole.
- a cementing operation includes pumping liquid cement, arrows C, into the annular area between a tubular installation and a borehole wall. This is generally done by pumping cement from surface down through the inner diameter of the tubular installation and out into the annulus, either by pumping the cement out the bottom of the tubular installation or out through a port in the tubular wall.
- the fibers of the cement diffuser are positioned to create pathway P through the cement, when it sets.
- the pathway is a cement-free space or weakened area of cement, through which fluids can flow more readily than through set cement.
- the fibers may substantially block clear access of the cement into the cement diffuser, as the cement moves through the annulus, thus the cement may tend not to infiltrate, or infiltrate only partially into, the spaces between the fibers of the collection of fibers due to fluid dynamics: leaving an open space within the cement diffuser which is free of cement.
- the cement may tend not to infiltrate the fibers of the collection of fibers due to a chemical applied to block access into any voids between the fibers.
- the cement may pass between the fibers of the cement diffuser, but the cement when set may be so thin, porous or unstable that the cement in that area is relatively weak.
- the cement may pass between the fibers of the cement diffuser, but the fibers may degrade or be deformable (i.e. are able to be pushed aside), such that a space is formed in the set cement.
- a pathway is created by the cement diffuser through the set cement.
- the radially extended length of the collection of fibers is selected to span the annulus such that the collection of fibers at their outboard ends are at least closely adjacent or possibly touching the borehole wall 14.
- the entire annular radial length outwardly of the port and the outer surface on which the cement diffuser is installed is either devoid of cement or includes only relatively weak deposits of cement.
- the outward extended length of fibers from the outer surface of the tubular may be selected at surface with consideration as to the expected annulus radial spacing between the tubular and the borehole wall, which will be known based on the drilling information and the tubular's known outer diameter.
- the cement diffuser may not extend fully about the circumference of the tubular.
- one or more open areas 19 are formed about the circumference of the tubular.
- the two cement diffusers may be spaced apart about the circumference of the tubular leaving open areas 19 therebetween through which the cement may flow through the annulus past the cement diffusers, when the tubular is positioned in a borehole.
- the cement diffuser is installed with a port-located portion thereof overlying at least a portion, for example herein illustrated as fully, over the open axial length L of its port 16 and an end portion of the cement diffuser is installed on the outer surface of the tubular positioned axially beyond the port.
- the cement diffuser is continuous with the port- located portion and the end portion directly adjacent each other. Together the port- located portion and the end portion ensure the pathway through the cement extends axially along the tubular body beyond the open axial length L of its port and
- the cement diffuser end portions are installed on the outer surface axially below and/or above the opening of the port.
- the port-located portion which is the portion overlying the port open axial length L
- fluid from within the tubular can pass up through the port and through that portion of the cement diffuser. Additionally, the fluid can continue into and pass through the extending ends of the cement diffuser. While the fluid is supplied through the port, it travels along the tubular outer surface through the diffuser axially away from the port. In this way, the fluid can move through the pathway created by the cement diffuser to access a length of the wellbore, as determined by the length of the end portions.
- the position of the end portion of the cement diffuser as axially beyond the port means that the end portion extends longitudinally, along the long axis x, and generally toward the ends of the tubular. While, for example, cement diffuser 10 is shown in Figures 1 A and 1 B as parallel with the long axis x of the tool, this need not be the orientation.
- the cement diffuser can be straight or curved. For example, in one
- the cement diffuser is curved: installed in a spiral fashion along the outer surface of the tubular (see for example Figure 5B, where cement diffuser 210' is mounted on a tubular overlying a port 216' through the tubular's wall and cement diffuser 210' spirals about the surface of the tubular as it extends axially away from the port 216').
- the cement diffuser can have a portion extending circumferentially beyond the side edges of the port.
- Fillers such as chemicals, other fibers, hollow, degradable or frangible components, etc. can be positioned in the voids formed between the fibers of the collections, such fillers being selected to prevent the solidification of cement in the voids.
- the cement diffuser either directly provides a path for the injected fluids to pass therethrough, or the cement diffuser can be pushed aside, expelled or broken down immediately or over time to create the pathway or cement that infiltrates the cement diffuser, if any, is unstable, thin or weakly set to readily create a pathway when injected fluids enter the pathway.
- Injected fluids can be passed through the tubular and out through the port over which a cement diffuser has been installed. The injected fluids pass outwardly though the port and into the pathway.
- the injected fluids pass through the pathway, including that extending away from the port to access a length of the wellbore greater than the axial open length of the port to facilitate fracturing of the wellbore by creating complex fractures and/or forming fractures at naturally weak rock.
- the cement diffuser can be secured on the exterior of the tubular in various ways.
- the cement diffuser includes a plate 120 with a plurality of holes 122a, 122b therethrough that can be secured on the outside of a tubular 1 12 over a port 1 16 and along the outer surface of the tubular.
- the holes serve various purposes and may have various sizes and shapes, as desired.
- larger holes 122a in this illustrated case formed as slots, are included on the plate, where the plate may be installed over a port 1 16 and greater volume flows may be passed through the slots.
- Smaller holes 122b are formed over another area of the plate.
- the plate may take various forms.
- This plate shown fits over port 1 16 and has end portions 120a for mounting over a portion of the tubular outer surface axially beyond the axial length L, between upper end wall 1 16a and lower end wall 1 16b, of its port.
- the plate may be further elongated or more than one such plate may be installed to form a longer length cement diffuser extending axially away from the axial length L of the port 1 16.
- Fibers 124 may be threaded through the holes 122a, 122b.
- the holes may be stuffed with fibers and the fibers may extend outwardly therefrom.
- the fibers may be linearly twisted in bundles, as shown. Alternately, the fibers may be individually extending or in the form of bunches, interengaged bundles, plugs, randomly arranged, linearly arranged, parallel, etc.
- the fibers together form a collection that extends out from the plate into the annulus about the tubular. In the illustrated embodiment, for example, fibers extend out substantially radially from the ports, relative to the circular dimension of the tubular.
- Fibers 124 may be selected to be long enough to touch the borehole wall of a borehole in which they are to be used.
- the fibers in this embodiment form a brush like structure that can engage and ride along the borehole wall, but are threaded through the holes of the plate 120 such that they are substantially not dislodged by such engagement.
- Fibers 124 may be secured to the plate such that they are forced out of the way by fluid flows through the port.
- the fibers over the ports may be forced out of holes 122a, 122b of the plate when fluid injection occurs through the port 1 16 and plate 120.
- the fibers may be installed or formed such that there remain fluid flow passages between the fibers, when they remain in the holes.
- fibers 124 may be formed of erodible or degradable materials/construction such that they break down at some point after cementing, for example, by the erosive power of the injected fluids.
- Fillers here shown as further fibers 126 of similar or, as shown, different
- construction/materials may be engaged between fibers 124 in the holes.
- more delicate polymeric batting is placed between the tufts formed by the bundles of fibers extending from the holes 122a, 122b of plate 120.
- fillers can be positioned in the voids formed between the fibers of the collection of fibers, such fillers being selected to prevent the entry or solidification of cement in the voids between fibers.
- Other fillers include for example, one or more of hollow balls, sponge, sytrofoam, or chemicals such as, for example, one or more of grease, sugar, salt, cement retarder, etc.
- Plate 120 can be secured over the port and along the surface in various ways, such as by fasteners 130 in apertures 132, welding, plastic deformation, etc.
- a recess 134 may be provided on the outer surface of the tubular such that the plate can be positioned below the tubular's outer surface contour.
- Fillers can also be positioned inwardly of plate 120 to act against passage of or setting of cement in port 1 16 and in the inner diameter of the tubular.
- cement C surrounds the cement diffuser but cannot readily infiltrate the fibers 124 and filler 126 of the cement diffuser. Any cement that does infiltrate the cement diffuser is weak. As such, a pathway is formed through cement diffuser 1 10 that is open to port 1 16.
- Cement diffuser 1 10 remains in place over port 1 16 when the port is opened for fluid injection therethrough.
- port 1 16 may have a closure (not shown)
- cement diffuser 1 10 does not in the illustrated embodiment act as a closure for the port.
- even after cementing fluid can exit port 1 16 while cement diffuser is in place or cement diffuser, or portions thereof, are pushed out of the way or degrade after use to create the pathway.
- fluid When fluid is injected to fracture the well, that fluid, arrows F, may pass from the inner diameter ID of the tubular 1 12 through the port 1 16. Fluid, arrows F, may then pass along the pathway in the cement created by fibers 124 and filler 126. Because the cement diffuser extends axially beyond the axial length of the port, the weakened pathway does so as well. Thus, the fluid may contact the wellbore wall 1 14 and create a complex fracture or locate an area of weakness in the rock, which may be both radially out from port 1 16 and/or axially spaced from the upper and lower limits 1 16a, 1 16b of port 16 and enhance the fracture results by reducing break down pressure and creating more than one fissure into the formation.
- FIG. 5A Another embodiment of a cement diffuser is shown in Figure 5A.
- That external structure includes a rope type structure 224, wherein the rope fibers are twisted and extend axially along the length of the rope.
- two structures 224 are shown secured to the external surface 1 12a of the tubular 1 12, Each structure 224 extends over a plurality of ports 216 in the wall of the tubular and axially beyond the axial lengths L of the ports.
- the external structure can take other forms.
- the external structure may include anything that can be positioned on the external surface of a wellbore tubular, holds to withstand the rigors of being run into a well, past which cement can flow and which creates a immediate or formable pathway in the cement, when the cement sets.
- Some structures of interest are centralizers (like a bow spring centralizer or an open vane centralizer), hollow tubes (like hollow tubes with frangible burst members installed in ports thereof), axially extending deformable structures (like rubber vanes that can deform to let a pressurized fluid pass), etc. These structures are mounted adjacent a port and positioned to receive a fluid supply from a port and to create a weakened pathway in the cement from the port, axially along the tubular away from the axial length of the port and in the annular area.
- Figure 5B includes a spirally oriented cement diffuser 210'.
- This is formed of a foam that can be installed on the tubular's outer surface but eventually breaks down after cementing. Since the cement diffuser 210' remains in place during cementing, the helical wraps of cement diffuser 210' are installed to leave open flow areas 219' therebetween through which cement, arrows C, can pass. After installation, the fracture fluid can move through ports 216' and along the spiral pathway to contact an axial length of the wellbore well beyond the axial open lengths of the ports.
- FIG. 5C shows another cement diffuser 210" mounted on a tubular 212" overlying a plurality of ports 216" opened through the tubular's wall.
- This cement diffuser 210" is formed as a sleeve-type structure on the outer surface.
- the cement diffuser extends axially beyond the upper and lower limits of ports 216". In fact, the cement diffuser extends substantially the full length of the tubular leaving only the end connections exposed. Additionally, cement diffuser 210" extends circumferentially about the tubular beyond the side edges that limit the circumferential open width of ports 216".
- cement diffuser 210 is formed of a resilient material such as sponge that is durable to withstand the rigors of being run into a wellbore and is strong enough to hold its shape during cementing. Since the cement diffuser 210" resists deformation by cement passing thereby, an open flow area 219" is provided through an axial length of the cement diffuser.
- the sponge forming cement diffuser 210" can, however, be pushed aside (i.e. cut into and/or compressed) when fluid at fracturing pressures is pumped through ports 216".
- fracture fluid can pass through cement diffuser 210" and contact the wellbore along a length much greater than the axial open length and open width of the individual ports and about a substantial portion of the circumference of the tubular.
- Fracturing fluid is much more likely to find an area of weakness and/or to form complex fractures along the substantial portions, both axially and circumferentially, about the ports.
- almost the full length and circumference of the wellbore that relates to the length and circumference of the cement diffuser is free of set cement and can be accessed by fracture fluid, except that area of flow channel 219" which contains set cement.
- a string 312 of ported tubulars with external cement diffusing structures 324a, 324b may be installed in a wellbore 314.
- the external structures 324a are in the form of bow spring centralizers and external structures 324b are in the form of spirally extending cement diffuser formed of a collection of fibers.
- the ported tubulars may be connected into a string with an inner diameter ID through which fluids may be conveyed to treat the well and from production of the well.
- the external structures are in place on the external surface 312a of the ported tubulars 312 as the string is installed in the well and when the string is in place in the well, the external structures are already positioned or can be activated and are adjacent a port 316.
- the external structures are also positioned to receive a fluid supply from a port 316 into a pathway formed as a result of the external structure though annular cement.
- cement C surrounds the external cement diffuser structures, but the structure of the external structures, wherein they include hollow sections, sections filled with fillers, etc., each create a pathway in the set cement.
- pathways extend from the port at which they are positioned, axially in the annular area along the tubular outer surface longitudinally away from the open area of the port.
- the external structures extend from the port open area and have a radial thickness such that they come close to touching or touch the wellbore wall.
- the pathways likewise extend from the port open area towards the wellbore wall, while extending axially away from the port.
- the pathway may be open to the wellbore wall or only a thin sheathe of cement may be present between the pathway and the wellbore wall.
- the fluid When fluid is injected to treat the wellbore, the fluid may pass through the inner diameter ID of the wellbore string, out through the ports 316 and along the paths to create complexity in the wellbore fracture and/or to create fractures in weak rock.
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- Environmental & Geological Engineering (AREA)
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- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2926236A CA2926236A1 (en) | 2013-10-04 | 2014-10-06 | Methods, strings and tools to enhance wellbore fracturing |
US15/027,192 US20160245062A1 (en) | 2013-10-04 | 2014-10-06 | Methods, strings and tools to enhance wellbore fracturing |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US201361886784P | 2013-10-04 | 2013-10-04 | |
US61/886,784 | 2013-10-04 |
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WO2015048910A1 true WO2015048910A1 (en) | 2015-04-09 |
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PCT/CA2014/050965 WO2015048910A1 (en) | 2013-10-04 | 2014-10-06 | Methods, strings and tools to enhance wellbore fracturing |
Country Status (3)
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US (1) | US20160245062A1 (en) |
CA (1) | CA2926236A1 (en) |
WO (1) | WO2015048910A1 (en) |
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US9994746B2 (en) | 2016-05-06 | 2018-06-12 | Rl Hudson & Company | Swellable packer seal composition |
US20170356269A1 (en) * | 2016-06-10 | 2017-12-14 | Rl Hudson & Company | Composite swellable packer material |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6401813B1 (en) * | 1999-09-15 | 2002-06-11 | Sps-Afos Group Limited | Wellhead cleanup tool |
US20070017675A1 (en) * | 2005-07-19 | 2007-01-25 | Schlumberger Technology Corporation | Methods and Apparatus for Completing a Well |
US7798226B2 (en) * | 2008-03-18 | 2010-09-21 | Packers Plus Energy Services Inc. | Cement diffuser for annulus cementing |
-
2014
- 2014-10-06 CA CA2926236A patent/CA2926236A1/en not_active Abandoned
- 2014-10-06 WO PCT/CA2014/050965 patent/WO2015048910A1/en active Application Filing
- 2014-10-06 US US15/027,192 patent/US20160245062A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6401813B1 (en) * | 1999-09-15 | 2002-06-11 | Sps-Afos Group Limited | Wellhead cleanup tool |
US20070017675A1 (en) * | 2005-07-19 | 2007-01-25 | Schlumberger Technology Corporation | Methods and Apparatus for Completing a Well |
US7798226B2 (en) * | 2008-03-18 | 2010-09-21 | Packers Plus Energy Services Inc. | Cement diffuser for annulus cementing |
Also Published As
Publication number | Publication date |
---|---|
CA2926236A1 (en) | 2015-04-09 |
US20160245062A1 (en) | 2016-08-25 |
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