EA029721B1 - System and method for hydraulic fracturing of oil and gas reservoirs - Google Patents

Abstract

The invention discloses a system and a method for hydraulic reservoir fracturing. The system may comprise a base pipe comprising a first hydraulic fracturing port, a port for insertion and accommodation of a stop ball, said stop ball being located partially in the cavity of said base pipe; a sliding device comprising a first sleeve disposed around said base pipe and having a second hydraulic fracturing port, said first sleeve having a pocket on its inner surface. Said first sleeve is movable to a first position where said pocket is located above the surface of said base pipe that does not include the port for the stop ball insertion and accommodation, which prevents said stop ball from leaving said base pipe cavity, and to a second position where said pocket is located above said stop ball insertion and accommodation port, which provides the possibility of the stop ball leaving said base pipe cavity and entering said pocket.

Description

DESCRIPTION OF THE INVENTION TO THE EURASIAN PATENT

(45) Date of publication and issuance of the patent 2018.05.31

(21) Application Number 201590099

(22) The application date is 2013.09.20

(51) Ιπί. C1. Е21В 34/14 (2006.01) Е21В 43/26 (2006.01)

(54) SYSTEM AND METHOD OF OIL AND GAS PLASTICS

(43) 2015.09.30

(86) PCT / EP2013 / 069578

(δϊ) \\ '() 2015/039698 2015.03.26

(71) (73) Applicant and patent holder:

FLOUPRO VEL TECHNOLOGY AS (ΝΟ)

(72) Inventor:

Brekke Christian (ΝΟ)

(74) Representative:

Nosyreva E.L. (Κϋ)

(56) υδ-Ά1-201230526565 υδ-Ά1-2004163820 υδ-Ά1-2004216927 υδ-Ά1-20112780101

029721 Β1

(57) The system and method of hydraulic fracturing are described. The system may contain a main pipe containing a first slot for fracturing, a slot for inserting and placing a stopper ball therein, wherein said stopper ball is partially in the cavity of said main tube; a sliding device representing a first sleeve arranged around said main pipe with a second slit for fracturing, wherein said first sleeve contains a pocket on the inner surface. Said first coupling is adapted to move to the first position, in which said pocket is located above the surface of said main pipe, which does not contain said slot for insertion and placement of a stopper ball in it, which prevents the said stopper ball from escaping from the cavity of said main pipe and into the second the position in which the specified pocket is located above the specified slot for inserting and placing in it the stopper ball, while allowing the stopper ball to exit the cavity indicated th main pipe to get into the specified pocket.

029721 Β1

029721

This description applies to the fracturing system and method of oil and gas production.

Over the years, the demand for natural gas and oil has increased significantly, making low-yield oil and gas fields economically viable, with hydraulic fracturing playing an important role in such energy production around the world. For several decades, various technologies have been used to improve the methods of extracting resources from oil and gas reservoirs. Long horizontal boreholes with multiple fractures are one of the widely used methods to increase oil and gas production from formations. This method begins after drilling a formation and installing an equipped well in the well bore. Multi-stage fracturing is a method that involves injecting a large amount of pressurized fluid or gel, proppant and / or other chemicals into the wellbore to create separate multiple fractures in the field along the wellbore.

One of the technologically advanced methods currently used is simultaneous hydraulic fracturing with the use of propping agents up to thirty fractures in a single injection operation. This method involves the use of a proppant to prevent gaps from closing. However, this technique can often cause an uneven distribution of the proppant between the gaps, which reduces the effectiveness of the fracturing system. As a result, this technique can also cause the spread of gaps in areas that are outside the target field. Thus, this method may be inefficient and unsafe.

In addition, fracturing with the use of propping agents usually involves several steps and requires several types of equipment for successful implementation. Such a technique, which ensures a uniform distribution of the proppant between the gaps, largely depends on the location of the plugs between the fracturing steps or the use of larger fracture balls. In these methods, either plugs are positioned after each drilling and injection of the fracture, or the fracture balls are dropped from the surface to successfully open the fracture valves located along the well. At each stage, balls of different diameters are dropped into the well corresponding to a specific valve seat for fracturing. The ball does not go beyond a certain point in the well due to a decrease in the diameter of the well. As soon as the ball is in a given place, fracturing may occur. After fracturing, the plug must be drilled and the balls must be removed. At each stage of hydraulic fracturing during the installation of the plugs, a lot of time and energy is expended when lifting the drill string from the well between the stages and drilling out the plugs. In addition, surface rigs are usually rented by the day, and thus delays can be extremely costly. In addition, only about 12 different fracturing steps can be carried out using the ball method before reducing the inflow zone due to the small ball diameter, which makes it difficult to fracture due to large pressure losses.

Therefore, it would be advisable to have an improved system and method of hydraulic fracturing of oil and gas reservoirs.

A brief description of the invention

This description relates to an improved system and method of fracturing. In one embodiment, the system may comprise a main pipe comprising a first fracture slot, a slot for inserting and placing a stopper ball therein, wherein said stopper ball is partially in the cavity of said main pipe; a sliding device representing a first sleeve arranged around said main pipe with a second slit for fracturing, wherein said first sleeve contains a pocket on the inner surface. Said first coupling is adapted to move to the first position, in which said pocket is located above the surface of said main pipe, which does not contain said slot for insertion and placement of a stopper ball in it, which prevents the said stopper ball from escaping from the cavity of said main pipe and into the second the position in which the specified pocket is located above the specified slot for inserting and placing in it the stopper ball, while allowing the stopper ball to exit the cavity indicated th main pipe to get into the specified pocket.

In another embodiment, the method may include connecting the main pipe to the column pipe. The main pipe may contain a slot for insertion and placement of a stopper ball in it, while the stopper ball is partially located in the cavity of the main pipe. The method may also include the step of bringing the sliding device from the first position to the second position. The sliding device may be a first clutch containing a pocket on the inner surface. In the first position, the pocket may be located on the surface of said main pipe, which does not contain slots for insertion, which prevents the said retaining ball from exiting the cavity of said main pipe. In the second position, the pocket can be located above the slot for insertion. Such an arrangement may allow the locking ball to exit the cavity of said main pipe for entry into said pocket.

- 1 029721

Brief description of graphic materials

FIG. 1A shows a side view of the main pipe.

FIG. 1B shows the main pipe view.

FIG. 1C is a sectional view of the main pipe.

FIG. 2A shows a sliding sleeve.

FIG. 2B is a view of the sliding sleeve.

FIG. 2C shows a sectional view of the sliding sleeve.

FIG. 2Ό shows a sectional view of the sliding sleeve.

FIG. ZA shows a perspective view of the outer ring.

FIG. ZV shows the outer ring.

FIG. 4A shows the valve body.

FIG. 4B in the valve body is shown a slot for fracturing.

FIG. 4C a process slot is shown in the valve body.

FIG. 5 shows a fracturing valve in a fracturing mode.

FIG. 6 shows a containment device in a fracture slot.

FIG. 7 shows an operating fracture valve.

Detailed Description of the Invention

This document describes an improved fracturing system and method of oil and gas production. The following description is provided to enable any person skilled in the art to perform and apply the invention as set forth in the claims, and is provided in the context of the specific examples described above, changes to which are obvious to those skilled in the art. For the purpose of simplification, not all features of the present invention are given in this detailed description. It should be noted that when designing any such implementation of the present invention (as in any development project), design decisions must be made to achieve specific design goals (for example, consistency with the limitations associated with the system and commercial activities), and that these goals differ in different implementations of the invention. It should also be noted that such a task for development may be difficult and time consuming, but, nevertheless, is a standard operation carried out by experts in the relevant field of technology, familiar with the advantages of this description of the invention. Accordingly, the claims attached to this document should be understood not as limited to the described embodiments, but as corresponding to their widest scope in accordance with the features and distinctive features described in this document.

FIG. 1A, a side view of the main pipe 100 is shown. The main pipe 100 may be attached as part of a pipe string. In one embodiment, the main tube 100 may be a cylindrical article, which may include various openings and / or slots in the wall. The holes in the wall of the main pipe 100 can be made in the form of a slot 101 for insertion, a slot 102 for fracturing and / or a technological slot 103. The slot 101 for insertion can be made of one or more small holes in the main pipe 100. The slot 102 for fracturing also can be made in the form of one or more holes. In addition, the technological slot 10Z can be a few holes in the main pipe 100.

FIG. 1B is a front view of the main pipe 100. The main pipe 100 may further comprise a cavity 104. The cavity 104 may be a cylindrical orifice created within the main pipe 100. Thus, the cavity 104 may be an opening that can allow material, such as fracturing fluid or hydrocarbons, to pass through it. FIG. 1C is a sectional view of the main pipe 100. Each hole described in the wall above may be located in a circle around the main pipe 100.

FIG. 2A, a sliding sleeve 200 is shown. In one embodiment, the sliding sleeve 200 may be a cylindrical tube that may include a fracture slot 102. Thus, the fracture slot 102 may have a first part inside the main pipe 101 and a second part inside the sliding sleeve 200. In FIG. 2B is a front view of the sliding sleeve 200. The sliding sleeve 200 may further comprise an external cavity 201. In one embodiment, the external cavity 201 may be a hole larger than the cavity 104. Thus, the external cavity 201 may be large enough to accommodate the main pipe 100.

FIG. 2C shows a sectional view of the sliding sleeve 200. The slip sleeve 200 may comprise a first sleeve 202 and a second sleeve 203. The first sleeve 202 and the second sleeve 203 may be attached with one or more curved plates 204, with the distance between each of the curved plate 204 forming part of the slit 102 for fracturing. The inner surface of the first clutch 202 may have a pocket with a narrowing or any other pocket in the inner surface. The pocket can extend radially around the entire inner diameter of the main pipe 101, partially around the inner diameter, or locally. When placed completely around the inside diameter, the edges of the inside surface may have a smaller diameter than the pocket.

- 2 029721

FIG. 2Ό shows a sectional view of the sliding sleeve 200. The slip clutch 200 may further comprise a fixed clutch 205 and an actuating device 206. In one embodiment, the actuating device 206 may be a device for displacement. In such an embodiment, the biasing device may be a spring. In another embodiment, the actuating device may be reversible and / or motorized. In one embodiment, the second clutch 203 of the slider 200 may be attached to the stationary clutch 205 using actuator 206. In one embodiment, the slip clutch 200 may be pulled in the direction of the stationary clutch 205, thus compressing or otherwise holding the actuator 206 under voltage, informing him of potential energy. Then, the actuating device 206 may be released or otherwise actuated by pushing the slide sleeve 200 out of the fixed sleeve 205.

FIG. 3A shows a perspective view of the outer ring 207. In one embodiment, the outer ring 207 may be a solid cylindrical tube forming an annular cavity 301, as can be seen from FIG. 3B. In one embodiment, the outer ring 207 may be a closed cylindrical shape of solid material. The annular cavity 301 may be a space formed inside the outer ring 207. In addition, the annular cavity 301 may be large enough to slide along the main pipe 100.

FIG. 4A illustrates a valve body 400. In one embodiment, the valve body 400 may be a cylindrical article, which may include a fracture slot 102 and a process slot 103. FIG. 4B shows a slot 102 for fracturing the valve body 400. In one embodiment, the fracture slot 102 may be a plurality of holes arranged in a circle around the valve body 400, as can be seen from FIG. 4B. FIG. 4C shows a process slot 103 of the valve body 400. In addition, the process slot 103 may be one or more openings located around the valve body 400, as can be seen from FIG. 4C.

FIG. 5 shows a valve 500 for fracturing in a fracturing mode. In one embodiment, the fracture valve 500 may comprise a main pipe 100, a sliding sleeve 200, an outer ring 207, and / or a valve body 400. In this embodiment, the main pipe 100 may be closest to the center of the valve cover 500 for fracturing. The middle shell around the main pipe 100 may be an outer ring 207 fixed to the main pipe 100 and the sliding sleeve 200, where the fixed sleeve 205 is fixed to the main pipe 100. The valve 500 for fracturing may include a valve body 400 as the outer shell. In one embodiment, the valve body 400 may be connected to the outer ring 207 and the fixed coupling 205. In the position for fracturing, the fracture slot 102 can be aligned and opened due to the relative position of the main pipe 100 and the sliding sleeve 200.

The fracture valve 500 may further comprise a fracture ball 501 and one or more locking balls 502. In one embodiment, the locking ball 502 may be located in the recess 101 for insertion. In the fracturing position, the actuator 206 may be in the closed position, pushing the stopper ball 502 partially into the cavity 104. In this position, the fracture ball 501 may be detached from the surface and may descend into the well. When the fracturing valve 500 is in the fracturing mode, the fracturing ball 501 may stop at the slit 101 to insert by any movement of the locking balls 502 forward. Thus, the protruding portion of the stopper ball 502 can stop the fracture ball 501. In this position, the fracture slot 102 will be open, allowing the proppant stream to flow from the cavity 104 through the fracture slot 102 into the formation, which will enable the fracture to occur.

FIG. 6, a fracture device is shown in the fracture slot. In an embodiment in which the actuating device 206 is a displacing device, such as a spring, the restraining device can counteract the actuating device 206. In one embodiment, the collapsing fixture in the form of a cable 601 can be a restraining device. Cable 601 can couple sliding sleeve 200 to main pipe 100. Intact, cable 601 can prevent release of actuator 206. If cable 601 is broken, actuator 206 can push slip sleeve 200. One way to destroy cable 601 may involve the introduction of a corrosive substance entering in reaction with the cable, through the slit for fracturing, since the corrosive agent can destroy the cable 601 until the executive device 206 can overcome it vivification.

FIG. 7, a fracture valve 500 is shown in operation. When the sliding sleeve 200 is pushed towards the outer ring 207 by means of the actuating device 206, the fracture slot 102 can be closed and the process slot 103 can be opened. At the same time, the fracture ball 501 can push the locking balls 502 back into the inner 3 029721

Rennie edge of the first coupling 202, which can additionally ensure the sliding of the ball 501 for fracturing through the main pipe 101 to another valve 500 for fracturing. Oil and gas production can begin when the process slot 103 is open. In one embodiment, the process slots 103 may include a check valve to allow the fracture to continue downstream without displacing the fracture fluid through the process slot 103.

In the details of the illustrated practical method, various changes are possible without deviating from the scope of the following claims. Some embodiments may combine the actions described in this document as separate steps. Similarly, one or more of the steps described may be omitted, depending on the specific operating conditions in which the method is carried out. It should be understood that the above description is intended for illustrative purposes and not for purposes of limitation. For example, the above embodiments may be used in combination with each other. When viewing the above description, many other embodiments of the invention will become apparent to those skilled in the art. Thus, the scope of the invention should be limited by the attached claims, along with the full scope of equivalents to which such

Claims (20)

Claim. In the appended claims, the terms "including" and "in which" are used as equivalents in modern English with the corresponding terms "comprising" and "where". CLAIM 1. System for hydraulic fracturing containing the main pipe containing the first slot for fracturing, the slot for inserting and placing in it a stopper ball, wherein said stopper ball is partially in the cavity of said main tube; a sliding device representing a first sleeve arranged around said main pipe with a second slit for fracturing, wherein said first sleeve contains a pocket on the inner surface, wherein said first sleeve is movable in the first position, in which said pocket is located above the surface of said main pipe, which does not contain said slot for inserting and placing a locking ball therein, which prevents the said locking ball from escaping from the cavity of said main pipe; and in the second position, in which the specified pocket is located above the specified slot for inserting and placing in it a stopper ball, while allowing the stopper ball to exit from the cavity of the said main pipe to get into said pocket. 2. The system for hydraulic fracturing according to claim 1, characterized in that it further comprises a stationary coupling fixed around said main pipe near the first side of said sliding device; and an actuating device connecting said stationary coupling with said sliding device, wherein said actuating device is configured to move the sliding device from said first position to said second position. 3. The system for hydraulic fracturing according to claim 1, characterized in that it further comprises a second clutch and one or more curved plates connecting said first coupling to said second coupling, wherein the distance between one or more of said curved plates forms said second fracturing slot. 4. The system for hydraulic fracturing according to claim 3, characterized in that said main pipe further comprises a process slot. 5. The system for hydraulic fracturing according to claim 3, characterized in that when the specified sliding device in the specified first position, the specified first slot for fracturing aligned with the specified second slot for fracturing, and when it is in the specified second position, then said first fracture cutout is not aligned with said second fracture cutout. 6. The system for hydraulic fracturing according to claim 1, characterized in that also when the specified sliding device in the specified first position, the specified second clutch blocks the specified technological slot, and when it is in the specified second position, the specified second coupling does not block the specified technological slot. 7. The system for hydraulic fracturing according to claim 4, characterized in that when the specified sliding device in the specified first position, the specified second clutch blocks the specified technological slot, and when it is in the specified second position, the specified second coupling does not block the specified technical nologichesky cut. 8. The system for hydraulic fracturing according to claim 1, characterized in that said slot for inserting and placing a retaining ball therein already near the cavity of said main pipe to prevent said retention ball from entering the said cavity completely. 9. The system for hydraulic fracturing according to claim 1, characterized in that said main pipe contains a second slot for insertion and placement of a stopper ball therein. 10. The system for hydraulic fracturing according to claim 9, characterized in that said pocket passes radially around the inside diameter of said main pipe, so that when the displacement device is in the specified first position, then the said pocket is located above the surface of the said main pipe, which does not contain the specified second slot for inserting and placing the stopper ball in it, and when it is in the second position, the said pocket is located above the said second slit for insertion and placement of a stopper ball therein. 11. The system for hydraulic fracturing according to claim 9, characterized in that said main pipe contains a second pocket located above the inner surface of said main pipe, so that when the bias device is in the specified first position, then the second pocket is located above the surface of the said main pipe, which does not contain the said second slot for inserting and placing the stopper ball therein, and when it is in the second position, said second pocket is located above said second slit for insertion and placement of a stopper ball therein. 12. The system for hydraulic fracturing according to claim 2, characterized in that the specified actuating device is a spring. 13. The system for hydraulic fracturing according to claim 2, characterized in that it further comprises a restraining device opposing the movement of the displacing device from the first position to the second position. 14. The system for hydraulic fracturing according to claim 13, characterized in that said restraining device is a cable, wherein the first end of said cable is connected to said main pipe, and the second end of said cable is connected with said sliding device, wherein said cable is located in specified first slot for fracturing and the second slot for fracturing. 15. The system for hydraulic fracturing according to claim 2, characterized in that it further comprises an outer ring fixed around said main pipe near the first side of said sliding device. 16. The system for hydraulic fracturing according to claim 1, characterized in that it further comprises a check valve in the process slot to prevent the fracturing fluid from escaping from said main pipe through said process slot. 17. Method of hydraulic fracturing using the system for hydraulic fracturing according to any one of paragraphs.1-16, including the connection of the main pipe with the column pipe, while the specified main pipe contains the first slot for hydraulic fracturing, a slot for inserting and placing in it a stopper ball, with the specified stopper ball partially in the cavity of the said main pipe; bringing the sliding device from the first position to the second position, wherein said sliding device is a first sleeve arranged around said main pipe with a second slot for fracturing, with said first coupling having a pocket on the inner surface, said first coupling being adapted to in the specified first position in which the specified pocket is located above the surface of the specified main pipe, not containing the specified slot for inserting and placing in it the stopper ball, which prevents the outflow of the specified stopper ball from the cavity of the said main pipe; and in the specified second position, in which the specified pocket is located above the specified slot for inserting and placing in it the stopper ball, while allowing the stopper ball to exit from the cavity of the said main pipe to get into the said pocket. 18. The method according to p. 17, characterized in that it includes a preliminary stage of hydraulic fracturing. 19. The method according to p. 18, characterized in that it includes a preliminary step of pushing the ball for fracturing along the specified string of pipes to the specified stop balls. 20. The method according to claim 19, further comprising the step of pushing said fracturing ball along said main pipe to a second or several locking balls in the second main pipe. - 5 029721