A tool for installing a conductor line without a riser and a method of using the same

Abstract

The application discloses a tool for hanging a riser installation sleeve and a use method thereof. The tool comprises a hydraulic connector, a lifting pipe arranged above the hydraulic connector and detachably connected with the hydraulic connector, a pressure testing hole radially arranged on the sidewall of the upper part of the lifting pipe, a hydraulic joint arranged in the pressure testing hole, a liquid discharge pipe radially arranged on the sidewall of the lower part of the lifting pipe, a hydraulic valve arranged on the liquid discharge pipe, a top sealing cover arranged above the lifting pipe and detachably connected with the lifting pipe, a through hole arranged in the center of the top sealing cover, a sealing rod arranged in the center of the hydraulic connector, the lifting pipe and the top sealing cover, the upper end of the sealing rod extending out of the top sealing cover through the through hole, and a hydraulic control panel. The tool has the beneficial effect that a temporary sealing area is formed between the hydraulic connector, the lifting pipe, the top sealing cover, the sealing rod and a high-pressure well mouth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas drilling equipment, and particularly relates to a tool for installing a casing hanger without a riser and a use method thereof. BACKGROUND

[0002] A subsea wellhead is a key piece of equipment for deepwater oil and gas exploration and development, and is generally composed of low-pressure wellheads, high-pressure wellheads and other components. The subsea wellhead is usually lowered from a floating drilling rig and seated on the mud line, and supports a casing string and seals the annular space between them.

[0003] A subsea blowout preventer and a riser are key equipment for a floating drilling rig to perform offshore oil drilling operations, and are locked and sealed with a high-pressure wellhead to provide a drilling fluid circulation channel for controlling wellhead pressure and preventing blowouts. Due to the water depth, it usually takes 2 to 7 days to install and recover the subsea blowout preventer and the riser. For a monitoring well without well control requirements, a development well drilled to a production layer after installation of a subsea Christmas tree, and a specific well section during drilling, a blowout preventer is not needed, but a sealing assembly is installed in the wellhead, and the sealing assembly still needs to be tested by using the blowout preventer. However, the installation and recovery of the blowout preventer not only takes a long time, but also has high requirements for the workboat, and affects the construction period. A tool for installing a casing hanger without a riser can replace the blowout preventer to form a temporary sealing area between the hydraulic connector, the riser, the inside of the top sealing cover, and the sealing rod and the high-pressure wellhead. The tool can be quickly installed and recovered, has low requirements for the workboat, and becomes the key to solving the problem. SUMMARY

[0004] The present application aims to provide a tool for installing a casing hanger without a riser, which can replace a blowout preventer to form a temporary sealing area between a hydraulic connector, a riser, the inside of a top sealing cover, and a sealing rod and a high-pressure wellhead, can be adapted to wellheads and service tools of different manufacturers, and can send a casing hanger and a sealing assembly into a tool without changing the structure of the existing wellhead and service tool, install the casing hanger and the sealing assembly and pressure test, and establish a stable and reliable closed environment.

[0005] The present application aims to provide a use method of a tool for installing a casing hanger without a riser, which can form a temporary sealing area between a hydraulic connector, a riser, the inside of a top sealing cover, and a sealing rod and a high-pressure wellhead, send a casing hanger and a sealing assembly into a tool, install the casing hanger and the sealing assembly and pressure test, and establish a stable and reliable closed environment.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions, comprising:

[0007] a hydraulic connector for sealing connection with a high-pressure wellhead;

[0008] a riser pipe arranged above the hydraulic connector and detachably connected with the hydraulic connector;

[0009] a pressure testing hole radially arranged on the sidewall of the upper part of the riser pipe, and a hydraulic connector arranged in the pressure testing hole;

[0010] a drain pipe radially arranged on the sidewall of the lower part of the riser pipe;

[0011] a hydraulic valve arranged on the drain pipe;

[0012] a top sealing cover arranged above the riser pipe and detachably connected with the riser pipe, a through hole arranged in the center of the top sealing cover, and a sealing ring arranged in the through hole;

[0013] a sealing rod arranged in the center of the hydraulic connector, the riser pipe and the top sealing cover, the upper end of the sealing rod extending out of the top sealing cover through the through hole, a sealing surface corresponding to the sealing ring arranged on the sealing rod, the upper end of the sealing rod connected with a drill pipe, and the lower end of the sealing rod connected with a casing hanger and a sealing assembly running tool, a sealing assembly, a casing hanger, a lock ring and a casing in sequence from top to bottom, the sealing rod used for running the casing hanger and the sealing assembly running tool, the sealing assembly, the casing hanger, the lock ring and the casing into a high-pressure wellhead;

[0014] a hydraulic control panel arranged above the top sealing cover, the hydraulic control panel connected with the hydraulic connector and the hydraulic connector through a plurality of hydraulic pipelines;

[0015] wherein a temporary sealing area is formed between the hydraulic connector, the riser pipe, the top sealing cover, the sealing rod and the high-pressure wellhead, and a stable and reliable closed environment is established for the casing hanger and the sealing assembly running tool, the installation of the casing hanger and the sealing assembly and the pressure testing.

[0016] Preferably, the hydraulic connector further comprises:

[0017] a bearing guide slope arranged in the inner wall of the top sealing cover below the through hole;

[0018] an expansion part arranged in the middle part of the sealing rod;

[0019] a bearing slope arranged on the upper part of the expansion part and matched with the bearing guide slope.

[0020] Preferably, the hydraulic connector comprises:

[0021] a plurality of hydraulic cylinder bodies arranged in the lower part of the hydraulic connector in a circumferential direction, a piston and a piston rod arranged in each of the hydraulic cylinder bodies, and the upper end of the piston rod extending above the hydraulic cylinder body.

[0022] An annular cavity is disposed above the hydraulic cylinder body;

[0023] A connecting ring, which is concentrically arranged in the annular cavity and connected to the piston rod, is used to move up and down along the annular cavity under the drive of the piston rod;

[0024] An annular locking block is disposed within an annular cavity and located inside the connecting ring; the inner wall of the annular locking block is provided with a tooth groove that meshes with the outer periphery of the high-pressure wellhead.

[0025] The inner wall of the connecting ring and the outer wall of the annular locking block are both conical surfaces; during the downward movement of the connecting ring, the annular locking block undergoes radial contraction, thereby achieving a sealed connection between the hydraulic connector and the high-pressure wellhead.

[0026] Preferably, a guide flare is provided at the lower end of the hydraulic connector.

[0027] Preferably, it also includes:

[0028] A sealing steel ring is disposed on the inner circumference of the middle part of the hydraulic connector; an annular groove is provided on the outer circumference of the middle part of the sealing steel ring;

[0029] Multiple sealing steel ring suspension pins are radially arranged in the middle of the hydraulic connector. The front end of each sealing steel ring suspension pin mates with the annular groove to suspend the sealing steel ring.

[0030] The lower outer circumference of the sealing steel ring is adapted to the inner circumference of the upper end of the high-pressure wellhead to improve the sealing performance between the hydraulic connector and the high-pressure wellhead.

[0031] Preferably, it also includes:

[0032] A steel ring, which is disposed between the contact surfaces of the hydraulic connector and the riser pipe, is used to improve the sealing performance of the hydraulic connector and the riser pipe.

[0033] A method for using a tool for installing a drainless pipe sleeve, employing any of the above-described tools, includes the following steps:

[0034] S1. Connect the riser pipe and the hydraulic connector, pressurize the hydraulic line, and open the hydraulic valve on the drain pipe; connect the casing hanger and sealing assembly feed tool, sealing assembly, casing hanger, locking ring and casing sequentially from top to bottom at the lower end of the sealing rod; then connect the upper end of the sealing rod to the drill pipe; lower the sealing rod into the center of the riser pipe, install the top sealing cap on the top of the sealing rod, and connect and seal the top sealing cap to the riser pipe;

[0035] S2, the tool of the riserless installation casing hanger is lowered to the high pressure wellhead by the drill pipe, and circulation flushing and cement slurry injection are carried out through the drill pipe;

[0036] S3, before the cement solidifies, the tool of the riserless installation casing hanger is lowered, the hydraulic connector is seated on the high pressure wellhead, liquid injection is carried out through the underwater robot control hydraulic control panel, the hydraulic connector is connected with the high pressure wellhead and sealed;

[0037] S4, the drill pipe is rotated and pressed down to complete the installation of the sealing assembly and the casing hanger;

[0038] S5, liquid injection is carried out through the underwater robot control hydraulic control panel, the liquid valve of the liquid discharge pipe is closed, liquid injection is carried out through the underwater robot control hydraulic control panel, the sealing assembly is pressure tested through the pressure testing hole, and the hydraulic connector is unlocked from the high pressure wellhead through the underwater robot control hydraulic control panel;

[0039] S6, the casing hanger and the sealing assembly delivery tool are recovered.

[0040] The beneficial effects of the present application are that a temporary sealing area is formed between the hydraulic connector, the elevated pipe, the inside of the top sealing cover, and the sealing rod and the high pressure wellhead, the casing hanger and the sealing assembly delivery tool are installed, the casing hanger and the sealing assembly are pressure tested, and a stable and reliable closed environment is established. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a sectional view of the tool of the present application.

[0042] In the figure, the hydraulic control panel 1, the top sealing cover 2, the sealing ring 201, the bearing and guiding inclined surface 202, the elevated pipe 3, the pressure testing hole 301, the hydraulic connector 302, the liquid discharge pipe 303, the hydraulic valve 304, the sealing rod 4, the sealing surface 401, the bearing inclined surface 402, the hydraulic connector 5, the hydraulic pipe line 501, the sealing steel ring suspension pin 502, the connecting ring 503, the annular lock block 504, the hydraulic cylinder body 505, the guiding horn mouth 506, the piston 507, the piston rod 508, the annular cavity 509, the casing hanger and sealing assembly delivery tool E1, the high pressure wellhead E2, the sealing assembly E4, the casing hanger E5, the lock ring E6, the casing E7, the sealing steel ring E8. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement the present application according to the description.

[0044] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or other elements or combinations thereof.

[0045] As Figure 1 shown, a tool for installing a conductor hanger without a riser of the present application comprises:

[0046] a hydraulic connector 5 for sealingly connecting with a high-pressure wellhead E2;

[0047] an elevated pipe 3 arranged above and detachably connected with the hydraulic connector 5.

[0048] a pressure testing hole 301 radially arranged on the sidewall of the upper part of the elevated pipe 3, and a hydraulic connector 302 arranged in the pressure testing hole 301.

[0049] a drain pipe 303 radially arranged on the sidewall of the lower part of the elevated pipe 3.

[0050] a hydraulic valve 304 arranged on the drain pipe 303.

[0051] a top sealing cover 2 arranged above and detachably connected with the elevated pipe 3; a through hole is arranged in the center of the top sealing cover 2, and a sealing ring 201 is arranged in the through hole.

[0052] a sealing rod 4 arranged in the center of the hydraulic connector 5, the elevated pipe 3 and the top sealing cover 2, the upper end of the sealing rod 4 extends out of the top sealing cover 2 through the through hole; a sealing surface 401 adapted to the sealing ring 201 is arranged on the sealing rod 4 at a position corresponding to the sealing ring 201; the upper end of the sealing rod 4 is connected with a drill pipe; the lower end of the sealing rod 4 is connected with, from top to bottom, a conductor hanger and sealing assembly running-in tool E1, a sealing assembly E4, a conductor hanger E5, a locking ring E6 and a casing E7; the sealing rod 4 is used for running in the conductor hanger and sealing assembly running-in tool E1, the sealing assembly E4, the conductor hanger E5, the locking ring E6 and the casing E7 into the high-pressure wellhead E2.

[0053] a hydraulic control panel 1 arranged above the top sealing cover 2, the hydraulic control panel 1 is connected with the hydraulic connector 5 and the hydraulic connector 302 through a plurality of hydraulic pipelines 501 respectively.

[0054] Among them, a temporary sealing area is formed between the inside of the hydraulic connector 5, the elevated pipe 3, the top sealing cover 2, and the sealing rod 4 and the high-pressure wellhead E2, to establish a stable and reliable closed environment for the conductor hanger and sealing assembly running-in tool E1, the installation of the conductor hanger E5 and the sealing assembly E4 and pressure testing.

[0055] In another embodiment, further comprising: a bearing guide slope 202 arranged in the inner periphery of the top sealing cover 2 below the through hole; an expansion part arranged in the middle of the sealing rod 4; a bearing slope 402 arranged on the upper part of the expansion part and matched with the bearing guide slope 202.

[0056] In another embodiment, the hydraulic connector 5 comprises: a plurality of hydraulic cylinder bodies 505 arranged in the lower part of the hydraulic connector 5 in a circumferential direction; a piston 507 and a piston rod 508 arranged in each of the hydraulic cylinder bodies 505; the upper end of the piston rod 508 extending out of the hydraulic cylinder body 505; an annular cavity 509 arranged above the hydraulic cylinder body 505; a connecting ring 503 arranged concentrically in the annular cavity 509 and connected with the piston rod 508, for moving up and down along the annular cavity 509 under the driving of the piston rod 508; an annular lock block 504 arranged in the annular cavity 509 and located on the inner side of the connecting ring 503; a tooth groove arranged on the inner side wall of the annular lock block 504 and matched with the outer periphery of the high-pressure wellhead E2; wherein the inner side wall of the connecting ring 503 and the outer side wall of the annular lock block 504 are conical surfaces; the connecting ring 503 makes the annular lock block 504 contract radially in the process of moving down, so as to realize the sealing connection between the hydraulic connector 5 and the high-pressure wellhead E2.

[0057] In another embodiment, a guide horn 506 is arranged at the lower end of the hydraulic connector 5.

[0058] In another embodiment, further comprising: a sealing steel ring E8 arranged in the inner periphery of the middle part of the hydraulic connector 5; an annular groove arranged on the outer periphery of the middle part of the sealing steel ring E8; a plurality of sealing steel ring suspension pins 502 arranged in the middle part of the hydraulic connector 5 in a radial direction, the front end of the sealing steel ring suspension pin 502 matched with the annular groove for suspending the sealing steel ring E8; wherein the outer periphery of the lower part of the sealing steel ring E8 matched with the inner periphery of the upper end of the high-pressure wellhead E2, so as to improve the sealing performance of the hydraulic connector 5 and the high-pressure wellhead E2.

[0059] In another embodiment, further comprising: a steel ring arranged between the abutting surface of the hydraulic connector 5 and the riser 3, so as to improve the sealing performance of the hydraulic connector 5 and the riser 3.

[0060] A method for using a tool for installing a riserless installation riser hanger, the tool being any of the tools described above, the method comprising the following steps:

[0061] S1. Connect the riser pipe 3 and the hydraulic connector 5, pressurize through the hydraulic line 501, and open the hydraulic valve 304 on the drain pipe 303; connect the casing hanger and sealing assembly feeding tool E1, sealing assembly E4, casing hanger E5, locking ring E6 and casing E7 sequentially from top to bottom at the lower end of the sealing rod 4; then connect the upper end of the sealing rod 4 to the drill pipe; lower the sealing rod 4 into the center of the riser pipe 3, and install the top sealing cap 2 on the top of the sealing rod 4, connecting and sealing the top sealing cap 2 to the riser pipe 3;

[0062] S2. Using the drill pipe, the tool for installing the casing without a riser is lowered to above the high-pressure wellhead E2. The drill pipe is then used for circulating flushing and injecting cement slurry.

[0063] S3. Before the cement solidifies, lower the tool for installing the casing without a riser, place the hydraulic connector 5 on the high-pressure wellhead E2, and inject fluid through the hydraulic control panel 1 controlled by the underwater robot to connect and seal the hydraulic connector 5 with the high-pressure wellhead E2.

[0064] S4. Rotate and press down the drill pipe to complete the installation of the sealing assembly E4 and the casing hanger E5;

[0065] S5. Inject fluid through the hydraulic control panel 1 controlled by the underwater robot and close the hydraulic valve 304 of the drain pipe 303; Inject fluid through the hydraulic control panel 1 controlled by the underwater robot and test the sealing assembly E4 through the test pressure hole 301; Inject fluid again through the hydraulic control panel 1 controlled by the underwater robot to unlock the hydraulic connector 5 from the high-pressure wellhead E2.

[0066] S6, Tool E1 for feeding in the recovery sleeve hanger and sealing assembly.

[0067] In summary, the present invention provides a tool and method for installing a casing hanger without a riser. A temporary sealing area is formed inside the hydraulic connector 5, the riser pipe 3, the top sealing cap 2, and between the sealing rod 4 and the high-pressure wellhead E2. This allows the tool to be inserted into the casing hanger and sealing assembly, and the casing hanger and sealing assembly to be installed and pressure tested, thus establishing a stable and reliable closed environment.

[0068] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A tool for installing a sleeve without a riprap, characterized in that, include: Hydraulic connectors, used for sealing connections to high-pressure wellheads; A riser pipe is disposed above the hydraulic connector and is detachably connected to the hydraulic connector. A test pressure hole is radially disposed on the side wall of the upper part of the riser pipe, and a hydraulic connector is provided in the test pressure hole; A drain pipe is radially disposed on the side wall of the lower part of the riser pipe; A hydraulic valve is installed on the drain pipe; A top sealing cap is disposed above the riser tube and is detachably connected to the riser tube; a through hole is provided in the center of the top sealing cap, and a sealing ring is provided in the through hole; A sealing rod is positioned at the center of the hydraulic connector, riser pipe, and top sealing cap. The upper end of the sealing rod extends out of the top sealing cap through the through hole. A sealing surface, adapted to the sealing ring, is provided on the sealing rod at a position corresponding to the sealing ring. The upper end of the sealing rod is connected to the drill pipe. The lower end of the sealing rod is sequentially connected from top to bottom to the casing hanger and sealing assembly feed tool, the sealing assembly, the casing hanger, the locking ring, and the casing. The sealing rod is used to lower the casing hanger and sealing assembly feed tool, the sealing assembly, the casing hanger, the locking ring, and the casing into the high-pressure wellhead. A hydraulic control panel is located above the top sealing cover, and the hydraulic control panel is connected to a hydraulic connector and a hydraulic joint via multiple hydraulic lines; A temporary sealing area is formed inside the hydraulic connector, riser pipe, top sealing cap, and between the sealing rod and the high-pressure wellhead. This area serves as a tool for inserting the casing hanger and sealing assembly, installing the casing hanger and sealing assembly, and conducting pressure testing, thus establishing a stable and reliable closed environment.

2. The tool for installing a pipe sleeve without a riprap as described in claim 1, characterized in that, Also includes: A bearing guide ramp is provided on the inner circumference of the top sealing cover, located below the through hole; An enlarged portion is disposed in the middle of the sealing rod; A bearing ramp is provided on the upper part of the enlarged portion and is adapted to the bearing guide ramp.

3. The tool for installing a pipe sleeve without a riprap as described in claim 1, characterized in that, The hydraulic connector includes: Multiple hydraulic cylinders are evenly distributed around the lower part of the hydraulic connector; each hydraulic cylinder is equipped with a piston and a piston rod; the upper end of the piston rod extends above the hydraulic cylinder. An annular cavity is disposed above the hydraulic cylinder body; A connecting ring, which is concentrically arranged in the annular cavity and connected to the piston rod, is used to move up and down along the annular cavity under the drive of the piston rod; An annular locking block is disposed within an annular cavity and located inside the connecting ring; the inner wall of the annular locking block is provided with a tooth groove that meshes with the outer periphery of the high-pressure wellhead. The inner wall of the connecting ring and the outer wall of the annular locking block are both conical surfaces; during the downward movement of the connecting ring, the annular locking block undergoes radial contraction, thereby achieving a sealed connection between the hydraulic connector and the high-pressure wellhead.

4. The tool for installing a non-waterproof pipe sleeve according to claim 3, characterized in that: A guide bell mouth is provided at the lower end of the hydraulic connector.

5. The tool for installing a pipe sleeve without a riprap according to claim 3, characterized in that, Also includes: A sealing steel ring is disposed on the inner circumference of the middle part of the hydraulic connector; an annular groove is provided on the outer circumference of the middle part of the sealing steel ring; Multiple sealing steel ring suspension pins are radially arranged in the middle of the hydraulic connector. The front end of each sealing steel ring suspension pin mates with the annular groove to suspend the sealing steel ring. The lower outer circumference of the sealing steel ring is adapted to the inner circumference of the upper end of the high-pressure wellhead to improve the sealing performance between the hydraulic connector and the high-pressure wellhead.

6. The tool for installing a pipe sleeve without a riprap according to claim 1, characterized in that, Also includes: A steel ring, which is disposed between the contact surfaces of the hydraulic connector and the riser pipe, is used to improve the sealing performance of the hydraulic connector and the riser pipe.

7. A method of using a tool for installing a pipe without a riser, comprising the tool for installing a pipe without a riser as described in any one of claims 1-6, characterized in that... Includes the following steps: S1. Connect the riser pipe and the hydraulic connector, pressurize the hydraulic line, and open the hydraulic valve on the drain pipe; connect the casing hanger and sealing assembly feed tool, sealing assembly, casing hanger, locking ring and casing sequentially from top to bottom at the lower end of the sealing rod; then connect the upper end of the sealing rod to the drill pipe; lower the sealing rod into the center of the riser pipe, install the top sealing cap on the top of the sealing rod, and connect and seal the top sealing cap to the riser pipe; S2. Use the drill pipe to lower the tool for installing the casing without a riser to the top of the high-pressure wellhead, and use the drill pipe to perform circulating flushing and cement slurry injection. S3. Before the cement solidifies, lower the tool for installing the casing without a riser, place the hydraulic connector on the high-pressure wellhead, and inject fluid through the hydraulic control panel controlled by the underwater robot to connect and seal the hydraulic connector to the high-pressure wellhead. S4. Rotate and press down the drill pipe to complete the installation of the sealing assembly and casing hanger; S5. Inject fluid using the hydraulic control panel controlled by the underwater robot and close the hydraulic valve of the drain pipe; Inject fluid using the hydraulic control panel controlled by the underwater robot and test the sealing assembly through the test pressure hole; Inject fluid again using the hydraulic control panel controlled by the underwater robot to unlock the hydraulic connector from the high-pressure wellhead; S6, Tool for feeding in the recovery sleeve hanger and sealing assembly.

Images