An offline cementing device and offline cementing method

Abstract

The application provides an offline cementing device and an offline cementing method, and relates to the technical field of oil and gas development.The offline cementing device comprises an offline cementing device assembly, a conversion short circuit, a cementing head, a casing hanger, a sealing device and a downhole isolation valve.The casing hanger is used for suspending a casing in a well.The cementing head, the conversion short circuit, the offline cementing device assembly and the casing hanger are sequentially and fixedly connected from top to bottom.The sealing device is used for sealing an annular space close to a wellhead.The cementing head is used for connecting a cementing cement pipeline.The scheme provided by the application can fully utilize resources and improve drilling efficiency.

Description

Technical Field

[0001] This invention relates to the field of oil and gas development technology, and in particular to an offline cementing device and offline cementing method. Background Technology

[0002] Cementing mainly involves injecting cement into the casing annulus to seal the annular space between the casing and the wellbore, as well as between casings, thus isolating oil, gas, and water layers and making the casing a channel for oil and gas to enter the well.

[0003] The conventional cementing method involves running a casing layer for cementing. At this time, the wellhead equipment is connected to the blowout preventer and the drilling rig. We usually call this cementing method online cementing.

[0004] In traditional oilfield development, the drilling rig remains stationary on a single well from the moment the first section of the wellbore is drilled until the wellhead production tree is installed. This method results in the loss of valuable drilling time because the rig idles during online cementing and cannot be moved to maintain the well control barrier, leading to a waste of resources. Therefore, a new solution is urgently needed to address these issues. Summary of the Invention

[0005] The purpose of this invention is to provide an offline cementing device and an offline cementing method to solve the problems existing in the prior art, make full use of resources, and improve drilling efficiency.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides an offline cementing device, including an offline cementing device assembly, a conversion connector, a cementing head, a casing hanger, a sealing device, and a downhole isolation valve. The casing hanger is used to suspend the casing inside the well. The cementing head, the conversion connector, the offline cementing device assembly, and the casing hanger are fixedly connected in sequence from top to bottom. The sealing device is used to seal the annular space near the wellhead. The cementing head is used to connect the cementing pipeline.

[0008] Preferably, the offline cementing device assembly includes a connecting sleeve and an outer sleeve. The bottom of the connecting sleeve is threadedly connected to the casing hanger. The outer sleeve is sleeved outside the connecting sleeve. When the bottom structure of the outer sleeve moves downward, it can press down on the setting ring of the sealing device. When the setting ring moves downward, it expands outward to open the locking ring so as to achieve the effect of the locking ring entering the groove on the inner wall of the outer sleeve.

[0009] Preferably, a sealing ring is provided between the connecting sleeve and the sleeve hanger for sealing.

[0010] Preferably, the conversion short connector is threaded to the top of the connecting sleeve, and the outer side of the conversion short connector is provided with multiple circumferentially arranged lifting lugs. The conversion short connector is threaded to the top of the connecting sleeve by rotating the lifting lugs.

[0011] Preferably, the lower part of the cementing head and the upper part of the conversion short connector are connected by a union.

[0012] The present invention also provides an offline cementing method, comprising:

[0013] After the casing is installed, the drilling rig and blowout preventer are removed.

[0014] The offline cementing device described above is installed at the wellhead to form a new well control barrier.

[0015] The present invention achieves the following technical effects compared to the prior art:

[0016] The solution provided by this invention enables offline cementing, reducing drilling rig leveling time and increasing drilling time. While cementing operations are being performed on the previous well, the drilling rig can slide into the next well for drilling, while the previous well maintains the necessary well control barriers, thus improving drilling efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a conventional online cementing connection.

[0019] Figure 2 This is a schematic diagram of the offline cementing device provided in Example 1.

[0020] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0021] Figure 4 This is a schematic diagram of the offline cementing assembly.

[0022] Figure 5 This is a schematic diagram of the conversion short circuit structure.

[0023] Among them, 101-Wellhead section; 102-Riser pipe; 103-Blowout preventer assembly; 104-Drilling rig section; 201-Casing hanger; 202-Sealing device; 2021-Locking ring; 203-Offline cementing assembly; 2022-Setting ring; 204-Converter short connector; 205-Cementing head; 301-Connecting sleeve; 302-Outer sleeve; 303-Sealing ring; 401-Converter short connector body; 402-Lifting lug; 403-Union head. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The purpose of this invention is to provide an offline cementing device and an offline cementing method to solve the problems existing in the prior art, make full use of resources, and improve drilling efficiency.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 This is a schematic diagram of a conventional online cementing connection.

[0028] A typical online cementing setup includes the wellhead section 101, riser 102, blowout preventer assembly 103, and drilling rig section 104. This conventional cementing method involves cementing each casing layer as it is laid. Therefore, throughout the entire drilling and cementing process, the riser 102, blowout preventer assembly 103, and drilling rig section 104 remain stationary until all drilling and cementing work is completed. During this process, especially during cementing, the entire drilling operation is in a waiting state.

[0029] Example 1

[0030] This embodiment provides an offline cementing device, such as... Figures 2-5As shown, the assembly includes an offline cementing device assembly 203, a conversion jumper 204, a cementing head 205, a casing hanger 201, a sealing device 202, and a downhole isolation valve. The downhole isolation valve is installed downhole along with the casing and can isolate the pressure inside the wellbore and the annular pressure. The casing hanger 201 is used to suspend the casing inside the well. The cementing head 205, the conversion jumper 204, the offline cementing device assembly 203, and the casing hanger 201 are fixedly connected from top to bottom. The sealing device 202 is used to seal the annular space near the wellhead. The wellhead 205 is used to connect the cementing pipeline. Specifically, the offline cementing device assembly 203 includes a connecting sleeve 301 and an outer sleeve 302. The bottom of the connecting sleeve 301 is threadedly connected to the casing hanger 201. The outer sleeve 302 is sleeved outside the connecting sleeve 301. When the bottom structure of the outer sleeve 302 moves downward, it can squeeze the setting ring 2022 of the sealing device 202 downward. When the setting ring 2022 moves downward, it pushes the locking ring 2021 outward to achieve the effect of the locking ring 2021 entering the groove on the inner wall of the outer sleeve.

[0031] The solution provided in this embodiment enables offline cementing, reducing the drilling rig's leveling time and increasing drilling time. While cementing operations are being performed on the previous well, the downhole isolation valve can maintain the required well control barrier, allowing the drilling rig to slide into the next well for drilling. At the same time, the previous well maintains the required well control barrier, thus improving drilling efficiency.

[0032] In some embodiments, in order to improve the sealing effect, a sealing ring 303 is provided between the connecting sleeve 301 and the sleeve hanger 201. Preferably, two sealing rings 303 are provided, and a sealing ring 303 mounting groove is provided on the side wall of the connecting sleeve 301, and the sealing ring 303 is installed in the sealing ring 303 mounting groove.

[0033] In some embodiments, the conversion shorting body 401 of the conversion shorting 204 is threadedly connected to the top of the connecting sleeve 301. The outer side of the conversion shorting body 401 of the conversion shorting 204 is provided with a plurality of circumferentially arranged lifting lugs 402. The conversion shorting 204 is threadedly connected to the top of the connecting sleeve 301 by rotating the lifting lugs 402.

[0034] In some embodiments, the lower part of the cementing head 205 is connected to the upper part of the conversion short connector 204 by a female connector 403, and the upper part of the cementing head 205 is provided with a multi-layer injection head for injecting cement.

[0035] The drilling rig can move back and forth between multiple wellheads. Specifically, when the well site is large enough, the usual method is to use multiple traction devices to drag the main body of the drilling rig to the new well location. When the well site is small, a hydraulic cylinder stepping translation device is also used to translate the main body of the drilling rig.

[0036] Example 2

[0037] This embodiment provides an offline cementing method, including:

[0038] After the casing is installed, the drilling rig and blowout preventer are removed.

[0039] The offline cementing device described in Example 1 is installed at the wellhead to form a new well control barrier, and the drilling rig and blowout preventer are moved to the next well to work.

[0040] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An offline cementing device, characterized in that: The system includes an offline cementing assembly, a conversion connector, a cementing head, a casing hanger, a sealing device, and a downhole isolation valve. The casing hanger is used to suspend the casing inside the well. The downhole isolation valve is installed downhole along with the casing. The cementing head, the conversion connector, the offline cementing assembly, and the casing hanger are sequentially and fixedly connected from top to bottom. The sealing device is used to seal the annular space near the wellhead. The cementing head is used to connect the cementing line. The offline cementing assembly includes a connecting sleeve and an outer sleeve. The bottom of the connecting sleeve is connected to the casing. The hanger is threadedly connected, and the outer sleeve is fitted outside the connecting sleeve. When the bottom structure of the outer sleeve moves downward, it can press down on the setting ring of the sealing device. When the setting ring moves downward, it expands the locking ring outward to achieve the effect of the locking ring entering the groove on the inner wall of the outer sleeve. The conversion short connector body is threadedly connected to the top of the connecting sleeve. The conversion short connector body has multiple circumferentially arranged lifting lugs on its outer side. By rotating the lifting lugs, the conversion short connector is threadedly connected to the top of the connecting sleeve. The lower part of the cementing head and the upper part of the conversion short connector are connected by a female head.

2. The offline cementing device according to claim 1, characterized in that: A sealing ring is provided between the connecting sleeve and the sleeve hanger for sealing.

3. An offline cementing method, characterized in that: include: After the casing is installed, the drilling rig and blowout preventer are removed. The offline cementing device according to any one of claims 1 to 2 is installed at the wellhead to form a new well control barrier.

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