Ultra-short radius sidetrack horizontal well tail pipe suspension well cementation process

Abstract

The invention discloses an ultra-short radius sidetrack horizontal well tail pipe hanging well cementation technology which comprises the steps that a casing pipe is put into a horizontal section of a sidetrack horizontal well, and the casing pipe is fixed through a packing type tail pipe hanger; a perforation tool and a bridge plug corresponding to the inner diameter of the casing pipe are obtained; performing staged fracturing on the horizontal section of the sidetrack horizontal well by using a bridge plug perforation continuous cropping technology; well cementation and well completion are completed through the packer type drilling liner hanger; the problems that when screen pipe completion is adopted for an ultra-short radius sidetrack horizontal well, the staged fracturing precise transformation condition is not met, only general fracturing transformation can be carried out, and due to the fact that spiral hole distribution is adopted, cement cannot fill an annular space, and well cementation cannot be achieved are solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of drilling engineering, specifically to the completion technology of ultra-short radius sidetracking horizontal wells. Background Art

[0002] The statements in this section only provide background information related to the present disclosure and do not constitute prior art.

[0003] As Figure 1 and Figure 2 shown, for sidetracking horizontal wells, window cutting and sidetracking are carried out on production wells. Since casing has been run and cemented during the drilling of production wells, compared with conventional horizontal wells, there are characteristics such as discontinuous casing and difficult cementing. Currently, the completion technology of ultra-short radius sidetracking horizontal wells at home and abroad is mainly screen pipe completion. Specifically, for sidetracking horizontal wells, generally φ73mm slotted screen pipes or perforated screen pipes are used for completion. By running a blank pipe in the build-up section and a large-hole screen pipe or slotted screen pipe in the horizontal section for completion, the completion string is fixed in the sidetracked wellbore through hydraulic release and water-swellable packers. Currently, there are mainly the following two problems with this technology: First, the inner diameter of the screen pipe is small, and the staged fracturing tool cannot be run in. The outer diameter of the pipe string is φ73mm and the inner diameter is φ62mm. Due to the small inner diameter, conventional perforating tools and bridge plugs cannot pass through the screen pipe and thus cannot be run into the wellbore. Therefore, it does not have the conditions for precise staged fracturing transformation and can only carry out general fracturing transformation, resulting in uncontrollable fracture opening positions and easy occurrence of fracturing cross-layer.

[0004] Second, there is an annulus connection between the screen pipe and the sidetracked wellbore, and cementing cannot be achieved. The screen pipe completion uses spiral hole layout, and the screen pipe is not sealed with the wellbore. Cement for cementing enters the wellbore from the annulus along the holes, and the cement cannot fill the annular space, so cementing cannot be realized.

[0005] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute prior art. Summary of the Invention

[0006] In view of this, the present disclosure provides a liner hanger cementing technology for ultra-short radius sidetracking horizontal wells to solve the problems that the screen pipe completion for ultra-short radius sidetracking horizontal wells does not have the conditions for precise staged fracturing transformation and can only carry out general fracturing transformation, and the spiral hole layout causes the cement to be unable to fill the annular space and cementing cannot be realized.

[0007] To achieve the above invention purpose, the liner hanger cementing technology for ultra-short radius sidetracking horizontal wells includes: Running a casing in the horizontal section of the sidetracking horizontal well, and fixing the casing with a packer-type liner hanger; Obtaining a perforating tool and a bridge plug corresponding to the inner diameter of the casing; The horizontal section of the sidetracked horizontal well is subjected to staged fracturing by using the bridge plug perforation continuous operation technology; The cementing and completion are completed by using the packer type liner hanger.

[0008] In the present disclosure and possible embodiments, the outer diameter of the casing is φ88.9 mm and the internal diameter is φ76 mm.

[0009] In the present disclosure and possible embodiments, the perforating tool and the bridge plug are conveyed by using a φ55 mm tubing or cable.

[0010] In the present disclosure and possible embodiments, the bridge plug is a soluble bridge plug.

[0011] In the present disclosure and possible embodiments, the diameter of the soluble bridge plug is φ62 mm, and its material is soluble magnesium alloy metal; A 3% potassium chloride solution is injected into the wellbore, and the soluble bridge plug is dissolved completely in 5 days.

[0012] In the present disclosure and possible embodiments, the perforating tool includes a φ51 mm perforating gun and φ26 mm penetration perforating charges.

[0013] In the present disclosure and possible embodiments, the packer type liner hanger has slips and a rubber sleeve; Before injecting cement slurry, the slips are opened by means of water pressure to set the liner hanger; After injecting the cement slurry, the rubber sleeve is expanded by pressurization to seal the annulus between the casing and the wellbore.

[0014] In the present disclosure and possible embodiments, the packer type liner hanger and the casing are lowered into the sidetracked wellbore by using a drill pipe.

[0015] The liner hanging cementing process for the ultra-short radius sidetracked horizontal well of the present disclosure draws on the mature cementing experience of horizontal wells, adopts liner hanging cementing and completion, lowers a 3 1 / 2" casing into the sidetracked wellbore, and cooperates with a packer type liner hanger and a small hole staged perforating tool of corresponding specifications, etc., to realize the lowering of a small-diameter perforating tool and a soluble bridge plug into the 3 1 / 2" casing, achieve the purpose of staged multi-cluster fracturing, provide effective technical support for the perforation, staged fracturing and later treatment of the ultra-short radius sidetracked horizontal well, realize the cementing of the ultra-short radius sidetracked wellbore and the selective stimulation transformation in the horizontal section of the sidetracked well, and thus effectively improve the measure effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Through the description of the embodiments of the present disclosure with reference to the following drawings, the above and other objects, features and advantages of the present disclosure are clearer. In the drawings: Figure 1It is a schematic diagram of cementing and completion of a conventional horizontal well described in the background art of the present disclosure; Figure 2 It is a schematic diagram of cementing and completion of a sidetrack horizontal well described in the background art of the present disclosure; Figure 3 It is a structural diagram of a tie-back plug in an embodiment of the present disclosure; Figure 4 It is a schematic diagram of cementing of the Ma 55-74 liner hanger in an embodiment of the present disclosure. Embodiment

[0017] The following describes the present disclosure based on embodiments. However, it is worth noting that the present disclosure is not limited to these embodiments. In the following detailed description of the present disclosure, some specific details are described in detail. However, for the parts not described in detail, those skilled in the art can also fully understand the present disclosure.

[0018] In addition, those of ordinary skill in the art should understand that the provided drawings are only for illustrating the purpose, features and advantages of the present disclosure, and the drawings are not actually drawn to scale. The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the terms "connection" and "coupling" used in this application. Unless otherwise specified, both include direct and indirect connection (coupling). In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to this application.

[0019] At the same time, unless the context clearly requires, the words such as "including" and "comprising" in the whole specification and claims should be interpreted as the meaning of inclusion rather than exclusive or exhaustive meaning; that is, the meaning of "including but not limited to". Embodiment

[0020] The ultra-short radius sidetrack horizontal well liner hanger cementing process described in the embodiment of the present disclosure includes: lowering a casing into the horizontal section of the sidetrack horizontal well, fixing the casing with a packer liner hanger, obtaining a perforating tool and a bridge plug corresponding to the inner diameter of the casing, and using the bridge plug perforation and continuous operation technology to perform staged fracturing on the horizontal section of the sidetrack horizontal well, and performing cementing and completion through the packer liner hanger.

[0021] Existing sidetracking horizontal wells generally use φ73mm slotted screen pipes or perforated screen pipes for completion. Since the inner diameter of the screen pipe is small and the staged fracturing tools cannot be lowered, in this embodiment, φ88.9mm casing is used to replace the φ73mm screen pipe. The φ88.9mm casing corresponds to 3 1 / 2" casing, and the inner diameter can be increased from φ62mm to φ76mm, thus facilitating the lowering of small-diameter perforating tools.

[0022] The outer diameter of the conventional YD-89 type perforating gun is 89mm and it cannot be lowered into the 3-1 / 2" casing. Therefore, in this embodiment, according to the characteristics of the conventional perforating gun, the conventional YD-89 type perforating gun is scaled down proportionally to a small-diameter perforating gun with a diameter of φ51mm, and is equipped with multi-stage sealing rings and initiators. Compared with the conventional perforating gun equipped with detonators, it is more reliable and safe, and can realize tubing pressure pumping or cable ignition perforation.

[0023] In this embodiment, aiming at the problem that the conventional φ39mm equal-aperture perforating charges have a large aperture and cannot be assembled on a small-diameter perforating gun, and the perforating thickness can only reach 0.5 - 1m, it is improved to a φ26mm penetration perforating charge, so that it can be matched with a small-diameter perforating gun. The deflagration of its explosive column can make the perforating thickness reach 2m, ensuring sufficient perforation of the target oil layer.

[0024] Furthermore, in this embodiment, the original ordinary φ114mm insoluble bridge plug used in the process is improved to a φ62mm soluble bridge plug, that is, the bridge plug material is changed from steel metal to soluble magnesium alloy metal, and 3% potassium chloride solution can be injected into the wellbore and dissolved completely in 5 days, which is convenient for setting between different reformed intervals in the horizontal section.

[0025] In this embodiment, φ55mm tubing or cable is used to connect and transport perforating tools and bridge plugs and other staged fracturing tools to realize operations such as staged perforation and fracturing in small-diameter wells.

[0026] Even after improving the Φ73mm screen pipe to φ88.9mm casing, cementing still cannot be carried out. In the existing screen pipe completion process, the screen pipes used mainly adopt water-swelling packers for fixation. The reason is that the water-swelling packers do not meet the cement slurry sealing conditions during cementing. If the packer does not release and set, the φ88.9mm casing cannot be suspended on the inner wall of the original well casing, and the cement slurry for cementing is likely to return to the wellbore from the packer position; if the packer releases and sets, the excess cement slurry cannot return from the packer position, and it is easy to build up pressure in the casing during cement slurry injection and the injection cannot be carried out, so cementing cannot be completed.

[0027] In this embodiment, instead of using a water-swellable packer, a packer-type liner hanger is used to fix the casing. This packer-type liner hanger adopts conventional techniques in the art and is provided with a slip and rubber sleeve structure, thus having two functions: slip setting and rubber sleeve sealing. Before injecting cement slurry, the slips are opened by applying pressure with clear water to achieve the purpose of initial setting. After the cement slurry is injected, the rubber sleeve is expanded by applying pressure to achieve setting and seal the annulus between the φ88.9mm casing and the wellbore. Before sealing, it can ensure that the excess cement slurry returns to the upper end of the hanger to prevent the cement slurry from being blocked during injection. After the original well casing is sealed, the expansion of the rubber sleeve can prevent the cement slurry from falling back, completing the cementing operation.

[0028] Specifically, the packer-type liner hanger in this embodiment can use a conventional 5-1 / 2*3-1 / 2 packer-type liner hanger in the art, such as the XG 140×89-F type packer liner hanger. This XG 140×89-F type packer liner hanger uses hydraulic suspension. After the cementing operation is completed, the hanger is set and sealed by lifting and pressing the sealing ring of the hanger to complete the cementing and completion of the well with the completion casing suspended.

[0029] However, the outer diameter of the 3-1 / 2 fracturing string (casing) in this embodiment is 88.9mm, which cannot be connected to the inside of a conventional 5-1 / 2*3-1 / 2 packer-type liner hanger. Therefore, according to the conventional design in the art, a backpressure plug with a conversion connection function as shown in Figure 3 with an inner diameter of Φ76mm is set between them, and the conventional 5-1 / 2*3-1 / 2 packer-type liner hanger is improved to have a backpressure barrel structure. Then, the backpressure plug is used to be hydraulically set in the backpressure barrel, and the hydraulic anchor is connected to the fracturing string (casing) by releasing the connection by back-off. Among them, the full length of the backpressure plug in this embodiment is 600 mm, the insertion length is 430 mm, the outer diameter is 117mm, and the inner diameter is 76 mm.

[0030] During assembly, the backpressure plug is set in the backpressure barrel, and the 3-1 / 2 fracturing string can be connected by back-off. Because the inner diameter of the backpressure plug is Φ76mm, a small-diameter perforating tool with an outer diameter of Φ62mm can be lowered for staged fracturing; during operation, before injecting cement slurry, the slips are hydraulically pushed up to the cone position and anchored in the original well casing to achieve the purpose of suspending the Φ88.9mm casing string; after the cement slurry is injected, the rubber sleeve is set by lifting and applying pressure. After the hanger is set, it seals the original well casing, preventing the cement from falling back into the wellbore from the hanger position; during operation, the backpressure and setting and sealing conditions of the liner hanger are provided by the hydraulic cylinder; the casing is guided into the well smoothly through the float collar and float shoe, achieving the sealing of the annulus between the casing and the wellbore, and preventing the annular cement slurry from flowing back into the casing.

[0031] The following combines Figure 4 to elaborate in detail on the application of the ultra-short radius sidetracking horizontal well liner hanging cementing process in this embodiment in Well Mao 55-74, as follows: Use the drill pipe to lower the 5-1 / 2 * 3-1 / 2 packer tailpipe hanger and 3-1 / 2" casing into the sidetrack wellbore, and install a cement head at the wellhead; circulate at a low displacement until normal, then drop a ball, and pump water to pressure until the copper ball enters the ball seat; apply pressure to 8 MPa to shear the external pin of the hanger and push the slips up to set the packer; continue to apply pressure to 18 MPa to shear the shear pin and choke the ball seat, then lower to the float collar to establish a wellbore circulation channel; apply a downward pressure of 5-10 tons on the drill string, rotate it clockwise 25 turns to reverse the thread, circulate and inject the cement slurry into the drill pipe and return it to the hanger position, drop a small rubber plug at the wellhead, inject clean water to displace the small rubber plug and push the cement slurry in the drill pipe downward, and achieve a bump pressure at the float collar position; observe the return water condition, remove the cement head and connect the drill pipe, lift the running tool and the sealing core 1.5 - 2 m, apply a downward pressure of 8-10 tons, after setting the packer, slowly lift out the central pipe from the hanger, and the pump truck follows the displacement to circulate and wash out the excess cement slurry until clear water is seen, then pull out the drill string to complete the well and wait for cement setting.

[0032] The window opening depth of this well is 1507.3 m, the distance in front of the target is 51.45 m, and the maximum wellbore curvature during actual drilling is: 59.86° / 30 m, the average curvature is 33.44° / 30 m, the average curvature radius is 51.4 m, the horizontal section length is 107 m, and the total depth of the completed well is 1696 m. The depth of the 3 1 / 2" casing is 1501 - 1694 m, and the cement return height is 1501 m. Cooperating with a small-diameter perforating gun and a soluble bridge plug, multi-cluster perforation and staged fracturing construction within the horizontal section are successfully achieved.

[0033] The ultra-short radius sidetrack horizontal well tailpipe hanging and cementing technology of the present invention has undergone two years of on-site tests and promotional applications. From 2021 to 2022, a total of 10 sidetrack horizontal well tailpipe hanging and cementing operations have been completed, and the construction success rate is 100%. By lowering the small-diameter perforating tool, soluble bridge plug and packer tailpipe hanger of this embodiment into the 3-1 / 2" casing in the present invention, multi-cluster staged fracturing is realized, providing effective technical support for perforation, staged fracturing and subsequent treatment of sidetrack wells.

[0034] The above embodiments are only for expressing the implementation modes of the present disclosure, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several deformations, equivalent replacements, improvements, etc. can be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure should be subject to the appended claims.

Claims

1. A cementing technology for liner hanger in ultra-short radius sidetrack horizontal well, characterized in that: Including: Run a casing string into the horizontal section of the sidetracked horizontal well, and fix the casing string with a packer-type liner hanger; Obtain a perforating tool and a bridge plug corresponding to the inner diameter of the casing string; Use the bridge plug perforation continuous operation technology to perform staged fracturing on the horizontal section of the sidetracked horizontal well; Complete cementing and well completion by using the packer-type liner hanger.

2. The cementing technology for liner hanger in ultra-short radius sidetrack horizontal well according to claim 1, characterized in that: The outer diameter of the casing string is φ88.9mm, and the internal diameter is φ76mm.

3. The cementing technology for liner hanger in ultra-short radius sidetrack horizontal well according to claim 2, characterized in that: Use a φ55mm tubing or cable to convey the perforating tool and the bridge plug.

4. The cementing technology for liner hanger in ultra-short radius sidetrack horizontal well according to claim 3, characterized in that: The bridge plug is a soluble bridge plug.

5. The cementing technology for liner hanger in ultra-short radius sidetrack horizontal well according to claim 4, characterized in that: The diameter of the soluble bridge plug is φ62mm, and its material is soluble magnesium alloy metal; Inject a 3% potassium chloride solution into the wellbore, and the soluble bridge plug is dissolved completely in 5 days.

6. The cementing technology for liner hanger in ultra-short radius sidetrack horizontal well according to claim 5, characterized in that: The perforating tool includes a φ51mm perforating gun and φ26mm penetration perforating charges.

7. The cementing technology for liner hanger in ultra-short radius sidetrack horizontal well according to any one of claims 1-6, characterized in that: The packer-type liner hanger has slips and a rubber sleeve; Before injecting cement slurry, keep the slips in an open state by applying pressure with clear water to set the liner hanger; After injecting the cement slurry, expand the rubber sleeve by applying pressure to seal the annulus between the casing string and the wellbore.

8. The cementing technology for liner hanger in ultra-short radius sidetrack horizontal well according to claim 7, characterized in that: Run the packer-type liner hanger and the casing string into the sidetrack wellbore by using a drill pipe.

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