CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Application No. 13/949961, filed on July 24, 2013, which is incorporated herein by reference in its entirety.

BACKGROUND

[0002] Opening perforations through walls of a tubular to allow fluid flow

therethrough after deployment of the tubular within a structure is not uncommon. One method of opening such perforations is through ignition of ballistic devices, referred to as guns. Due to the explosive nature of the guns shipment of them through some jurisdictions is not permitted. The art is, therefore, always receptive to alternate methods of opening perforations in tubulars that do not require guns.

BRIEF DESCRIPTION

[0003] Disclosed herein is a non-ballistic tubular perforating system. The system includes a tubular having a wall with perforations therethrough and at least one radially extendable member positioned radially of the perforations configured to displace cement radially of the tubular and configured to radially extend prior to pumping of the cement.

[0004] Further disclosed herein is a method of opening perforations in a tubular system. The method includes radially increasing a radially increasable member positioned radially outwardly of perforations in a tubular positioned within a borehole in an earth formation, cementing an annular space between the tubular and the borehole, displacing cement with the radial increasing of the radially increasable member, pumping fluid through the tubular and breaching the radially increasable member and establishing fluidic communication between an inside of the tubular and the earth formation.

[0005] Further disclosed herein is a non-ballistic tubular perforating system. The system includes a tubular having a wall with perforations therethrough, at least one radially extendable member oriented radially of the tubular proximate the perforations configured to prevent cement from being positioned radially of the perforations when in a radially extended condition and at least one occluding member configured to initially prevent fluid inside the tubular from reaching the radially extendable member.

[0006] Further disclosed herein is a non-ballistic tubular perforating system. The system includes a tubular having a wall with perforations therethrough and at least one radially extendable member positioned radially of the perforations configured to displace cement radially of the tubular.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The following descriptions should not be considered limiting in any way. With reference to the accompanying drawings, like elements are numbered alike:

[0008] FIG. 1 depicts a partial quarter cross sectional view of an alternate

embodiment of a non-ballistic tubular perforating system disclosed herein with a radially extendable member in an non-extended condition;

[0009] FIG. 2 depicts a partial quarter cross sectional view of the non-ballistic tubular perforating system of FIG. 1 with the radially extendable member swollen and cement pumped therearound;

[0010] FIG. 3 depicts a partial quarter cross sectional view of the non-ballistic tubular perforating system of FIG. 1 with the radially extendable member swollen and valves isolating a fracing zone;

[0011] FIG. 4 depicts a partial quarter cross sectional view of the non-ballistic tubular perforating system of FIG. 1 with the radially extendable member swollen and a ball sealed on a seat;

[0012] FIG. 5 depicts a partial quarter cross sectional view of an alternate

embodiment of a non-ballistic tubular perforating system disclosed herein with a radially extendable member in an non-extended condition; and

[0013] FIG. 6 depicts a partial quarter cross sectional view of the non-ballistic tubular perforating system of FIG. 5 in a radially extended condition.

DETAILED DESCRIPTION

[0014] A detailed description of one or more embodiments of the disclosed apparatus and method are presented herein by way of exemplification and not limitation with reference to the Figures.

[0015] Referring to Figures 1 through 4, an embodiment of a non-ballistic tubular perforating system disclosed herein is illustrated at 10. The system 10 includes, a tubular 14 having a wall 18 with perforations 22 therethrough. Optional plugs 26 are positioned within the perforations 22 thereby preventing fluid from flowing therethrough. The plugs 26 are made of a material that is dissolvable in a selected environment as will be elaborated on below. Cement 30 (shown in Figures 2-4 only) is positionable radially of the tubular 14 in an annular space 16 defined between embodiment, in an earth formation 38. At least one radially extendable member 12 is positioned radially outwardly of the tubular 14 in locations covering the perforations 22 with a single continuous one of the radially extendable member 12 being illustrate in this embodiment that is wrapped helically around the tubular 14.

[0016] The radially extendable member 12 can be a swellable material, an inflatable member, a shape memory material or other device that can increase radially while surrounding the tubular 14. In embodiments wherein the radially extendable member 12 is swellable, an additional volume of the cement 30 displaced is substantially equal to the change in volume of the swellable material 12. In an embodiment wherein the radially extendable member 12 is a shape memory material such as a shape memory polymer, for example, the volume of the cement 30 displaced needs not change as the shape memory material 12 changes shape since the radial increase of the shape memory material 12 can be offset by a reduction in the longitudinal dimension of the shape memory material 12 thereby leaving the volume of the shape memory material 12 substantially constant.

[0017] Since, in some embodiments, the radially extendable member 12 can increase dimensionally in both radial and longitudinal directions simultaneously, its volume can change. The radially extendable member 12 can be configured to swell at selected rates and in response to exposure to selected environments including fluids and temperatures that are anticipated to be present in the downhole environment, or fluids that can be pumped into contact with the radially extendable members 12. For example, in one embodiment the radially extendable member 12 can be configured to swell after the cement 30 has been pumped into the annular space 16 but before the cement 30 has hardened or cured. Such a configuration allows the cement 30 to flow through the annular space 16 and between the walls 20 and the radially extendable member 12 prior to it swelling. The swelling of the swellable material 12 can then displace more of the uncured cement 30 and create contact with the walls 20 directly. This configuration allows fluid under pressure within the tubular 14 to flow through the perforations 22 (after dissolution of the plugs 26, if so equipped) to the radially extendable member 12. The radially extendable member 12 can be selected to be more easily breached by pressurized fluid acting thereagainst than is the cement 30.

Consequently, pressuring up within the tubular 14 can cause fluid to flow through the perforations 22 and breach (or rupture) the radially extendable member 12 thereby establishing fluidic communication between an inside of the tubular 14 and the earth formation 38. This fluid communication allows treating of the formation 38. Such treatments include fracturing, pumping proppant and acid treating, for example. Additionally, the system 10 would allow for production of fluids, such as hydrocarbons, for example, from the formation 38.

[0018] The plugs 26 can prevent fluid inside the tubular 14 from reaching the radially extendable member 12 until the plugs 26 have degraded. This allows control over when fluidic pressure from inside the tubular 14 has access to the radially extendable member 12, as well as when fluid that causes the radially extendable member 12 to swell can have access to the radially extendable member 12.

[0019] In another embodiment the radially extendable member 12 can be configured to extend prior to cementing. In this embodiment the cement 30 can be pumped in a helical fashion through the annular space 16 defined between longitudinally adjacent portions of the radially extendable member 12 that may create a seal against the walls 20 due to being extended into contact with the walls 20. Regardless of whether the radially extendable member 12 extends before or after the cement 30 is pumped, the radially extendable member 12 establishes essentially a cement free pathway from the inside of the tubular 14 through the perforations 22 and through the radially extendable member 12 to the earth formation 38.

[0020] The perforations 22 can be divided up into one or more zones 23, with just a single one of the zones 23 being illustrated herein. Methods can be employed, to prevent simultaneous pressuring up of all zones 23 located along the system 10. For example, valves 24 can be employed, as illustrated in Figure 3, to isolate and frac (or treat in other ways) only the zone 23 located between the two valves 24. Alternately, a ball 28 can be sealed against a seat 32, as illustrated in Figure 4, to pressure up against the radially extendable member 12 in the zones 23 positioned upstream of the seat 28 while leaving the radially extendable member 12 in zones downstream of the seat 32 intact and in sealing contact with the tubular 14.

Leaving radially extendable member 12 intact in one or more of the zones 23 can prevent fluid from flowing through the perforations 22 in those zones 23 until a later time when the radially extendable member 12 covering the perforations 22 in those zones 23 has been breached.

[0021] Referring to Figures 5 and 6, an alternate embodiment of a non-ballistic tubular perforating system is illustrated at 310. The system 310 employs radially extendable member 312 at discrete positions along the system 310, such as at radially extendable packers 315, for example. As with the system 10, in the system 310 the radially extendable member 312 can be configured to radially extend after the cement 30 is pumped but before the cement 30 is hardened, or prior to pumping the cement 30. Radially extending the radially extendable member 312 after the cement 30 is pumped allows it to be pumped through the annular clearance between the walls 20 of the wellbore 38 and the radially extendable member 312. After-which radially extending of the radially extendable member 312 displaces some more of the cement 30 as the radially extendable member 312 radially extends into contact with the walls 20. Pumping the cement 30 after the radially extendable member 312 is in sealing contact with the walls 20 may require running an inner string within the tubular 14 to pump the cement 30 into the isolated annular spaces 316 between the adjacent portions of the radially extendable member 312.

[0022] The perforations 22 in the tubular 14 of system 310 are in the shape of elongated slots. In this embodiment a sleeve 319 with ports 323 therethrough is positioned relative to each of the packers 315 such that the ports 323 are initially longitudinally misaligned with the perforations 22. Seals 327 between the sleeves 319 and the tubular 14 occlude fluid communication between the ports 323 and the perforations 22 until the sleeves 319 have moved to longitudinally align the ports 323 with the perforations 22. This blockage of fluid or other environmental conditions can prevent pressure from rupturing the radially extendable member 312 until desired, and can prevent fluid or other environmental conditions that causes the radially extendable member 312 to radially extend from reaching the radially extendable member 312 until desired. This blockage can also isolate the plugs 26 from exposure to fluid that can cause the plugs 26 to dissolve until desired.

[0023] In the illustrated embodiment the sleeves 319 include a seat 331 that is receptive to a runnable plug 335, such as the ball shown. Seating the ball 335 allows pressure built against the plug 335 to move the sleeve 319 to thereby align the ports 323 with the perforations 22 to establish fluidic communication therethrough. Other embodiments are contemplated that employ other means, such as a shifting tool, for example, to move the sleeves 319. Once fluidic communication is established through the ports 323 and the perforations 22 pressurized fluid can flow therethrough and breach the radially extendable member 312 in a fashion similar to that of the system 10.

[0024] The plugs 26 can be made of a degradable material such as a high strength controlled electrolytic metallic material that is degradable in brine, acid, or an aqueous fluid. For example, a variety of suitable materials and their methods of manufacture are described in United States Patent Application Publication No. 2011/0135953 (Xu et al), the Patent Application Publication of which is hereby incorporated by reference in its entirety. The invention is not limited to this material, however, and the plugs 26 can be made of other degradable or dissolvable materials such as, Polyglycolic Acid or calcium carbonate, for example. When the plugs 26 are made of calcium carbonate or a material containing sufficient amounts of calcium carbonate, the plugs 26 can dissolve when exposed to a solution that causes calcium carbonate to dissolve.

[0025] While the invention has been described with reference to an exemplary embodiment or embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the claims. Also, in the drawings and the description, there have been disclosed exemplary embodiments of the invention and, although specific terms may have been employed, they are unless otherwise stated used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention therefore not being so limited. Moreover, the use of the terms first, second, etc. do not denote any order or importance, but rather the terms first, second, etc. are used to distinguish one element from another. Furthermore, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.