SYSTEM FOR MULTI-WELL FRAC USING MONO-BORE FLEX PIPE
A system for fracturing an underground formation includes a flexible pipe receiving a high pressure slurry from a missile outlet, the flexible pipe including one or more sections arranged in series. The system also includes a connector secured to an end of the flexible pipe, the connector adapted to fluidly couple the flexible pipe to one or more fracturing trees of a plurality of fracturing trees associated with a wellbore, wherein the flexible pipe directs the high pressure slurry into the wellbore, via the one or more fracturing trees, the flexible pipe being movable between respective fracturing tree inlets of the plurality of fracturing trees.
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This application claims priority to and the benefit of co-pending U.S. Provisional Patent Application Ser. No. 62/811,670 filed Feb. 28, 2019 titled “SYSTEM FOR MULTI-WELL FRAC USING MONO-BORE FLEX PIPE,” the full disclosure of which is hereby incorporated herein by reference in its entirety for all purposes.
BACKGROUND 1. Field of the DisclosureThis disclosure relates in general to oil and gas tools, and in particular, to systems and methods for fracturing operations at a well site, particularly zipper frac sites.
2. Description of Related ArtIn oil and gas production, various tubulars, valves, and instrumentation systems may be used to direct fluids into and out of a wellhead. For example, in hydraulic fracturing operations, frac trees may be arranged at the wellhead and include pipe spools and various valves to direct hydraulic fracturing fluid into the wellbore. If several trees are arranged proximate one another, fracturing may be done in series, with one frac tree being utilized before a second frac tree is used. The piping is typically hard piping, which may not be utilized for long periods of time while adjacent frac trees are used. Additionally, the piping may be subject to erosion and contribute to line losses due to diameter changes and bends.
SUMMARYApplicant recognized the limitations with existing systems herein and conceived and developed embodiments of systems and methods, according to the present disclosure, to improve the systems by utilizing encapsulation of various datasets into common transmission packets.
In an embodiment, a system for fracturing an underground formation includes a flexible pipe, coupled to a missile outlet of a missile receiving a high pressure slurry from a pump, the flexible pipe arranged on a spool adapted to increase or decrease a working length of flexible pipe based on rotation of the spool. The system also includes a connector secured to an end of the flexible pipe, the connector adapted to engage a fracturing tree associated with a wellbore, wherein the flexible pipe directs the high pressure slurry into the wellbore, via the fracturing tree.
In an embodiment, a system for fracturing an underground formation includes a flexible pipe receiving a high pressure slurry from a missile outlet, the flexible pipe arranged on a spool adapted to increase or decrease a working length of flexible pipe based on rotation of the spool. The system also includes a connector secured to an end of the flexible pipe, the connector adapted to fluidly couple the flexible pipe to a fracturing tree associated with a wellbore, wherein the flexible pipe directs the high pressure slurry into the wellbore, via the fracturing tree.
In an embodiment, a system for fracturing an underground formation includes a flexible pipe receiving a high pressure slurry from a missile outlet, the flexible pipe including one or more sections arranged in series. The system also includes a connector secured to an end of the flexible pipe, the connector adapted to fluidly couple the flexible pipe to one or more fracturing trees of a plurality of fracturing trees associated with a wellbore, wherein the flexible pipe directs the high pressure slurry into the wellbore, via the one or more fracturing trees, the flexible pipe being movable between respective fracturing tree inlets of the plurality of fracturing trees.
In an embodiment, a method for fracturing an underground formation includes coupling a first end of a flexible pipe to an outlet of a high pressure fluid collection system, the high pressure fluid collection system receiving the high pressure fluid from one or more pump outlets. The method also includes coupling a second end of the flexible pipe to a first inlet of a first fracturing tree. The method further includes fracturing the wellbore via the first fracturing tree. The method also includes disconnecting the second end of the flexible pipe from the first inlet of the first fracturing tree. The method further includes moving the second end of the flexible pipe to a second inlet of a second fracturing tree. The method also includes coupling the second end of the flexible pipe to the second inlet of the second fracturing tree.
In an embodiment, a method for fracturing an underground formation includes coupling a first end of a first flexible pipe segment to an outlet of a high pressure fluid collection system, the high pressure fluid collection system receiving the high pressure fluid from one or more pump outlets. The method also includes coupling a second end of a second flexible pipe segment to a first inlet of a first fracturing tree. The method also includes disconnecting the second end of the second flexible pipe segment from the first inlet of the first fracturing tree, after a fracturing operation is performed via the first fracturing tree. The method includes moving the second end of the second flexible pipe segment to a second inlet of a second fracturing tree. The method further includes coupling the second end of the second flexible pipe segment to the second inlet of the second fracturing tree.
In an embodiment, a system for hydraulic fracturing operations includes a plurality of high pressure fracturing pumps positioned at a well site, each pump of the plurality of high pressure fracturing pumps receiving a fluid from a supply source. The system also includes a missile receiving high pressure fluid from each pump of the plurality of high pressure fracturing pumps. The system further includes a plurality of fracturing trees. The system also includes a spool supporting flexible pipe, a working length of the flexible pipe being adjustable, the flexible pipe having a first end coupled to the missile and a second end configured to couple to at least one fracturing tree of the plurality of fracturing trees, wherein the second end is configurable to be moved between each fracturing tree of the plurality of fracturing trees.
In an embodiment, a system for hydraulic fracturing operations includes a plurality of high pressure fracturing pumps positioned at a well site, each pump of the plurality of high pressure fracturing pumps receiving a fluid from a supply source. The system also includes a missile receiving high pressure fluid from each pump of the plurality of high pressure fracturing pumps. The system further includes a plurality of fracturing trees. The system also includes one or more flexible pipe segments forming a flow path between the missile and at least one fracturing tree of the plurality of fracturing trees, wherein coupling end of the one or more flexible pipe segments is configurable to be moved to adjust the flow path between each fracturing tree of the plurality of fracturing trees.
The present technology will be better understood on reading the following detailed description of non-limiting embodiments thereof, and on examining the accompanying drawings, in which:
The foregoing aspects, features and advantages of the present technology will be further appreciated when considered with reference to the following description of preferred embodiments and accompanying drawings, wherein like reference numerals represent like elements. In describing the preferred embodiments of the technology illustrated in the appended drawings, specific terminology will be used for the sake of clarity. The present technology, however, is not intended to be limited to the specific terms used, and it is to be understood that each specific term includes equivalents that operate in a similar manner to accomplish a similar purpose.
When introducing elements of various embodiments of the present invention, the articles “a,” “an,” “the,” and “said” are intended to mean that there are one or more of the elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. Any examples of operating parameters and/or environmental conditions are not exclusive of other parameters/conditions of the disclosed embodiments. Additionally, it should be understood that references to “one embodiment”, “an embodiment”, “certain embodiments,” or “other embodiments” of the present invention are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Furthermore, reference to terms such as “above,” “below,” “upper”, “lower”, “side”, “front,” “back,” or other terms regarding orientation are made with reference to the illustrated embodiments and are not intended to be limiting or exclude other orientations.
In current multi well zipper frac applications, operators typically use a zipper manifold, which comprises of a set of valves that are opened and closed to selectively pump frac fluid in to the well. A manifold typically has an inlet and an outlet. Hydraulic fluid is collected from multiple pumps in to a separate collection manifold, which is hydraulically coupled to the inlet of the zipper manifold with rigid piping. The outlet of the zipper manifold is coupled to the frac stack on the well using similar rigid piping (one or more sections). In this system, piping and manifolds are typically made of a variety of steels.
Embodiments of the present disclosure will reduce or eliminate the use of a zipper manifold and associated rigid piping. For example, systems and methods of the present disclosure include a flexible pipe that has a first end connected to the outlet of a collection manifold, which combines all or substantially all high pressure pump outputs into a single stream. The flexible pipe may be referred to as a monobore flexible pipe and, in various embodiments, includes a connector at a second end, opposite the end coupled to the collection manifold, coupled to the frac stack (e.g., at a far end designed to couple to a frac stack). It should be appreciated that, in various embodiments, controls valves may also be positioned at the outlet of the collection manifold, at the outlet of the flexible pipe, or any location between. Furthermore, additional flow paths may also be arranged between the outlet of the collection manifold and the flexible pipe. However, systems and methods may not include only a single section of flexible pipe. For example, multiple segments of flexible pipe may be connected together in series. That is, an inlet of a first monobore flexible pipe may be connected to (or fluidly coupled to) the outlet of the collection manifold, and a second monobore flexible pipe may be connected to the outlet of the first monobore flexible pipe, and so on. Moreover, embodiments are presented where a first end is coupled directly to the outlet of the collection manifold and the second end is coupled directly to the frac stack.
In various embodiments, parallel control valves may enable multiple configurations including any number of flexible pipe sections. For example, a first monobore flexible pipe outlet may include a control valve that can direct flow to either a second monobore flexible pipe or a third monobore flexible pipe, which may be arranged in parallel to the second monobore flexible pipe. The flex pipe will be reel mounted, in certain embodiments, which in turn will be mounted on a trailer, truck bed, platform, skid, or the like. Once the trailer is brought to location and positioned as needed, the piping may be rolled out, for example, by using a crane (trailer mounted or standalone) to adjust a working length of the flexible pipe. It should be appreciated that all of the pipe need not be rolled out from the spool, as at least a portion of the piping may remain on the reel. Additionally, in embodiments where multiple spools are used, one or more of the spools may be completely unspooled while one or more other spools are partially unspooled or not unspooled at all. Furthermore, if flex pipe is left mounted on the reel during operations, a fluid flow connector may be coupled with one end of the flex pipe. This fluid flow connector will exit the reel in the same direction as the axis of the reel. This connector could be used as the inlet or outlet. The inlet end may be carried to the outlet of the collection manifold using a crane, or in certain embodiments other lifting devices, and the connection can be made up manually or using a remote actuated quick connect. Similarly, the outlet end will be carried by the crane to the well that is intended to the fractured and the connection will be made at the frac stack. The connector can be a flange, thread, clamp, actuated or manual. In cases where the distance from the wells and pumps is greater, multiple flex pipes can be connected in series.
After the connection is made with the well that is intended to be fractured, frac can commence. Once frac is over, and the operator wishes to move to the next well, the connection between well and flex pipe is broken (remotely or manually) and the crane will carry the flex pipe to the next well that is intended to be fractured and the connection will be made. This sequence of events can be repeated as many times as is needed until all the wells on the location are fractured as intended.
Embodiments of the present disclosure may provide various benefits over existing methods including a zipper manifold to perform fracturing operations. For example, embodiments of the present disclosure may: eliminate the use of zipper manifolds (reduced piping and valves at the site), use a flex pipe that has a polyethylene (polymer/thermoplastic) inner layer, which is more resistant to erosion, may include fewer turns and hence reduce friction losses, include a true monobore system, include fewer leak paths, provide a modular arrangement that can be utilized with various pad layouts, reduce pressure drop in the line, reduce greasing time due to the decreased number of valves, enable a mono-head inlet into the frac tree, facilitate remote operations, and utilize quick connect connections to facilitate movement between frac trees.
Embodiments of the present disclosure provide a streamlined flow system that reduces a total number of connections at the well site and also reduces a number of leak paths. Furthermore, less material is utilized at the well site because the same flex pipe may be moved from frac tree to frac tree. Additionally, as described below, in various embodiments the system may facilitate remote movement, coupling, and decoupling of the flex pipe and/or connectors, thereby reducing personnel being arranged proximate the equipment.
In various embodiments of the present disclosure, a flexible pipe segment, which may be arranged on a spool, it utilized in combination with a lifting device, such as a crane, to couple various fracturing trees at a frac site to a fluid supply (e.g., missile). Embodiments eliminate the manifold and valve arrangement of traditional fracturing sites that use a series of valves and parallel/series piping to direct fluid flow into the frac trees. In various embodiments, a single fluid conduit may be moved between different fracturing trees to facilitate fracturing operations. In operation, the flexible pipe segment may include a connector to facilitate coupling to the frac tree. The connectors may include flange ends, clamps, automated/remote connectors, and the like. The flexible pipe may couple to the frac tree in a variety of configurations, such as proximate ground level, at a top of the frac tree, at an angle relative to an axis of the frac tree, or any other reasonable position. Furthermore, various lengths of flex pipe may be coupled together, which may or may not include valves between the different lengths, to accommodate frac trees at different distances from the missile. In various embodiments, remote operations are facilitated by remote connectors (e.g., hydraulic couplings and the like) and/or remote arrangement systems such as a crane or motorized cradle, as described herein. Accordingly, a modular design is provided where a spool can arrive on site at the well site, a length (e.g., a working length) of the flex pipe can be particularly selected, and the spool may be arranged at a convenient location relative to the missile and/or the frac trees. Furthermore, the flexible pipe may be lined using a thermoplastic or elastomer to provide erosion resistance. Accordingly, embodiments described herein include a single flexible line that may be connected to and disconnected from different frac trees at a multi-well site to conduct fracturing operations. Various isolating equipment may be provided to sufficiently segregate sections of the flexible pipe to enable pressure testing or the like. The flexible line, moreover, may be arranged with various different configurations to reduce bends, thereby reducing friction and line losses.
In various embodiments, the flexible line may not be connected directly to a missile outlet, but rather, to any outlet downstream of the missile. For example, one or more instrumentation skids may be arranged between the missile outlet and the trees. Accordingly, the flexible line may be arranged upstream of the instrumentation skid (e.g., between the missile and the instrumentation skid), downstream of the instrumentation skid (e.g., between the instrumentation skid and the tree), or in both locations. For example, a first flexible line may connect the missile to the instrumentation skid and a second flexible line may connect the instrumentation skid to the tree. Furthermore, various embodiments described herein may reference a spool for the flexible line, however, this configuration is for illustrative purposes only and the flexible line may not be on a spool. Additionally, in various embodiments, the flexible line may not be coupled directly to a tree, but rather, to fluid conduits coupled to the tree, as will be illustrated below.
Embodiments of the present disclosure may enable reduced material use at the well site. For example, the same flexible line may be moved from well to well to direct fluid into the desired well, as described below. Moreover, this flexible line may be reused and transported to a different well site for further use. Additionally, piping configurations described herein are illustrative and a variety of configurations, such as parallel, series, and the like may be incorporated in a well site layout. For example, multiple flexible lines may be connected in series to achieve the configurations presented herein. However, in other embodiments, additional lines may also be arranged in parallel. Accordingly, it should be appreciated that piping configurations may be particularly selected based on operating conditions.
In various embodiments, monitoring equipment 40 can be mounted on a control vehicle 132, and connected to, e.g., the pumps 102, blender 124, the trees 106, and other downhole sensors and tools (not shown) to provide information to an operator, and to allow the operator to control different parameters of the fracturing operation.
As illustrated schematically in
The illustrated environment 200 includes trees 106A-106D. Each tree 106 is associated with a respective wellhead (not pictured) and includes a lower master valve 202A-202D, wing valves 204A-204D, swab valves 206A-206D, and other valves 208A-208D. It should be appreciated that the systems and methods described herein may be utilized with any of the valves associated with the respective trees 106. As described above, the trees 106 receive hydraulic fracturing fluid, for example from the missile 110, which is directed into the well via the trees 106. The valves associated with the trees 16 may be utilized to block or restrict flow into the well. In the illustrated embodiment, various piping segments 210 are coupled together to form a collective manifold system 212. The manifold system 212 may include one or more valves to regulate fluid flow between the trees 106. The manifold system 212 includes an inlet 214 that may receive fluid, for example, from the missile 110. In various embodiments, a number of high pressure fluid streams are collected, for example at the missile 110, and then directed to the inlet 214. Moreover, a number of missile 110 may be arranged at the well site and then flow from one or more missile 110 may be directed toward the manifold system 212.
As illustrated, the manifold system 212 includes numerous piping segments 210 that include a variety of configurations, such as straight sections, elbows, and the like. It should be appreciated that the length of these segments 210 may be directly associated with a pressure drop within the manifold system 212. Moreover, increasing the number of bends may also lead to additional pressure drop. The manifold system 212 of
A cradle 408 is shown arranged proximate the inlet 404 for supporting the flex pipe 300, as is further illustrated in
Further illustrated in
The flex pipe 300 includes the connector 412, which is illustrated as a mating stump 504 in
It should be appreciated that the connectors illustrated in
In the embodiment of
As illustrated in
The foregoing disclosure and description of the disclosed embodiments is illustrative and explanatory of various embodiments of the invention. Various changes in the details of the illustrated embodiments can be made within the scope of the appended claims without departing from the true spirit of the disclosure. The embodiments of the present disclosure should only be limited by the following claims and their legal equivalents.
Claims
1. A system for fracturing an underground formation, comprising:
- a flexible pipe receiving a high pressure slurry from a missile outlet, the flexible pipe including one or more sections arranged in series; and
- a connector secured to an end of the flexible pipe, the connector adapted to fluidly couple the flexible pipe to one or more fracturing trees of a plurality of fracturing trees associated with a wellbore, wherein the flexible pipe directs the high pressure slurry into the wellbore, via the one or more fracturing trees, the flexible pipe being movable between respective fracturing tree inlets of the plurality of fracturing trees.
2. The system of claim 1, further comprising:
- a plurality of pumps, each outlet of each pump of the plurality of pumps coupled to a missile, wherein the flexible pipe is used to direct the high pressure slurry to each fracturing tree of the plurality of fracturing trees.
3. The system of claim 1, further comprising:
- a cradle arranged proximate an inlet of the fracturing tree, the cradle receiving and supporting the flexible pipe.
4. The system of claim 3, wherein the cradle further comprises:
- an inner surface shaped to conform to an outer surface of the flexible pipe; and
- adjustable legs for changing a height of the inner surface relative to a ground plane.
5. The system of claim 1, wherein the connector is at least one of flange ends, clamps, an automated connector, a remoted connector, or a hydraulic connector.
6. The system of claim 1, further comprising:
- a lifting mechanism configured to move the flexible pipe between a first location and a second location.
7. The system of claim 1, wherein the connector is a hydraulic connector, further comprising:
- a hydraulic connection system coupled to an inlet of the frac tree, the hydraulic connection system having an opening fluidly coupled to a bore extending through the frac tree; and
- a mating stump coupled to the flexible pipe, the mating stump adapted to enter the opening.
8. The system of claim 1, wherein the flexible pipe includes a plurality of layers, the plurality of layers including at least one metallic layer and at least one thermoplastic layer.
9. A method for fracturing an underground formation, comprising:
- coupling a first end of a first flexible pipe segment to an outlet of a high pressure fluid collection system, the high pressure fluid collection system receiving the high pressure fluid from one or more pump outlets;
- coupling a second end of a second flexible pipe segment to a first inlet of a first fracturing tree;
- disconnecting the second end of the second flexible pipe segment from the first inlet of the first fracturing tree, after a fracturing operation is performed via the first fracturing tree;
- moving the second end of the second flexible pipe segment to a second inlet of a second fracturing tree; and
- coupling the second end of the second flexible pipe segment to the second inlet of the second fracturing tree.
10. The method of claim 9, further comprising:
- positioning at least a portion of the second flexible pipe segment within a cradle.
11. The method of claim 9, wherein moving the second end of the second flexible pipe segment further comprises:
- engaging at least a portion of at least one of the first or second flexible pipe segments via a lifting mechanism.
12. The method of claim 11, wherein the lifting mechanism is a crane positioned outside a pressure zone of at least one of the first fracturing tree or the second fracturing tree.
13. The method of claim 11, wherein coupling the second end of the second flexible pipe segment to the first inlet of the first fracturing tree further comprises:
- aligning a connector of the second flexible pipe segment with the first inlet; and
- securing the second flexible pipe segment to the first inlet via the connector.
14. The method of claim 11, further comprising:
- adjusting a working length of at least one of the first or second flexible pipe segments between the first fracturing tree and the second fracturing tree.
15. The method of claim 11, wherein at least one of the first fracturing tree or the second fracturing tree comprises a hydraulic connector, further comprising:
- aligning the second end of the second flexible pipe segment with an opening in the connector;
- positioning at least a portion of the second end of the second flexible pipe segment within the opening; and
- engaging one or more hydraulic features of the hydraulic connector to secure the second end of the second flexible pipe segment within the opening.
16. The method of claim 11, further comprising:
- connecting a plurality of high pressure fluid collection systems to the first end of the first flexible pipe segment.
17. A system for hydraulic fracturing operations, comprising:
- a plurality of high pressure fracturing pumps positioned at a well site, each pump of the plurality of high pressure fracturing pumps receiving a fluid from a supply source;
- a missile receiving high pressure fluid from each pump of the plurality of high pressure fracturing pumps;
- a plurality of fracturing trees; and
- one or more flexible pipe segments forming a flow path between the missile and at least one fracturing tree of the plurality of fracturing trees, wherein coupling end of the one or more flexible pipe segments is configurable to be moved to adjust the flow path between each fracturing tree of the plurality of fracturing trees.
18. The system of claim 17, further comprising:
- a cradle arranged proximate an inlet of at least one fracturing tree of the plurality of fracturing trees, the cradle receiving and supporting the flexible pipe.
19. The system of claim 17, further comprising:
- a lifting mechanism, positioned at the well site, configured to engage and move at least a portion of the flexible pipe.
20. The system of claim 17, wherein the flexible pipe is supported by a spool.
Type: Application
Filed: Feb 27, 2020
Publication Date: Sep 3, 2020
Applicant: Baker Hughes Oilfield Operations LLC (Houston, TX)
Inventor: Saurabh Kajaria (Houston, TX)
Application Number: 16/803,149