CN111561299B - Liquid drainage and gas production operation system and operation method suitable for engineering ship - Google Patents
Liquid drainage and gas production operation system and operation method suitable for engineering ship Download PDFInfo
- Publication number
- CN111561299B CN111561299B CN202010453628.2A CN202010453628A CN111561299B CN 111561299 B CN111561299 B CN 111561299B CN 202010453628 A CN202010453628 A CN 202010453628A CN 111561299 B CN111561299 B CN 111561299B
- Authority
- CN
- China
- Prior art keywords
- coiled tubing
- pressure
- marine riser
- underwater
- riser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 85
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 67
- 239000012530 fluid Substances 0.000 claims description 40
- 238000012360 testing method Methods 0.000 claims description 37
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 19
- 238000005086 pumping Methods 0.000 claims description 18
- 239000013535 sea water Substances 0.000 claims description 15
- 239000003345 natural gas Substances 0.000 claims description 10
- 241000191291 Abies alba Species 0.000 claims description 7
- 239000002343 natural gas well Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 abstract description 11
- 235000004507 Abies alba Nutrition 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000007667 floating Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003305 oil spill Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/038—Connectors used on well heads, e.g. for connecting blow-out preventer and riser
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
- E21B43/0107—Connecting of flow lines to offshore structures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
- E21B43/013—Connecting a production flow line to an underwater well head
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a liquid drainage and gas production operation system and method suitable for an engineering ship. The liquid drainage and gas production operation system comprises a high-pressure marine riser and a continuous oil pipe; one end of the high-pressure marine riser is connected with an underwater wellhead, and an underwater blowout preventer is arranged at the underwater wellhead; the other end of the high-pressure marine riser extends to the engineering ship; the coiled tubing is arranged in the high-pressure riser, one end of the coiled tubing extends to the position of the shaft, and the other end of the coiled tubing extends to the outside of the high-pressure riser; an annular space formed between the high-pressure marine riser and the coiled tubing form a circulating channel for liquid drainage and gas production; the high-pressure marine riser is matched with a cross joint, the third branch of the cross joint is communicated with a return liquid recovery tank, and the fourth branch is communicated with a throttling well-killing pipeline; the free end of the continuous oil pipe is communicated with the liquid storage tank. The invention can be used for both conventional drilling operation ships and engineering ships, has strong adaptability and flexible and convenient operation, and can be widely applied to the drilling, completion and well repairing operations of deep water oil and gas fields adopting an underwater wellhead development mode.
Description
Technical Field
The invention relates to a liquid drainage gas production operation system and method suitable for an engineering ship, and belongs to the technical field of liquid drainage gas production of natural gas wells developed by underwater wellheads.
Background
The underwater well head is a common device for offshore oil and gas field development, a natural gas well developed by adopting an underwater well head mode can generate a large amount of liquid output in the production process, so that when liquid volume is accumulated to the extent that the gas well can not be carried to the well head through air flow, liquid accumulation can be caused, gas is pressed underground by the liquid, the gas can not enter a shaft to normally produce gas, the well repairing operation is needed in the time, the liquid drainage and gas production operation is adopted, the liquid accumulation in the shaft is discharged out of the shaft, and the underground natural gas is introduced into the shaft again to be produced. The conventional liquid drainage and gas production operation needs to adopt floating drilling equipment, a drilling riser is connected with an underwater wellhead, then a feeding pipe column is put into the drilling riser, a coiled tubing is put into the feeding pipe column, a circulating channel is formed in a central hole of the coiled tubing, an annulus between the coiled tubing and the feeding pipe column, and liquid drainage and gas production operation is carried out. The operation mode needs floating equipment with a riser system and a complex tension system, generally only large floating drilling equipment has operation conditions, generally, liquid drainage and gas production operation is relatively simple workover operation, and if the large floating drilling equipment is adopted, the cost of workover operation is increased inevitably, and the oilfield development benefit is influenced. But the common engineering ship can not meet the conventional liquid drainage and gas production process.
Disclosure of Invention
The invention aims to provide a liquid drainage and gas production operation system and an operation method suitable for an engineering ship.
The liquid drainage and gas production operation system utilizes a small-sized high-pressure riser (the conventional drilling riser is 21in, and the small-sized high-pressure riser can be 5-7 in) to connect an underwater wellhead with an engineering ship to form a circulating channel.
The liquid drainage and gas production operation system utilizes a lifting system of a derrick of an engineering ship to lift a high-pressure marine riser and tension the marine riser, and utilizes a compensation system of the lifting system to compensate axial load generated on the marine riser when the engineering ship moves along with wave heave. The coiled tubing penetrates through the high-pressure riser, and a liquid drainage and gas production circulation channel is formed by the coiled tubing, an annulus between the coiled tubing and the high-pressure riser, so that liquid drainage and gas production operation is implemented.
Specifically, the liquid drainage and gas production operation system provided by the invention comprises a high-pressure marine riser and a coiled tubing;
one end of the high-pressure marine riser is connected with an underwater wellhead, and an underwater blowout preventer is arranged at the underwater wellhead;
the other end of the high-pressure marine riser extends above the engineering ship;
the coiled tubing is arranged in the high-pressure marine riser, one end of the coiled tubing extends to a shaft, the other end of the coiled tubing extends to the outside of the high-pressure marine riser, and the matching part of the coiled tubing and the end part of the high-pressure marine riser is in sealing arrangement; an annular space formed between the high-pressure marine riser and the coiled tubing form a circulating channel for liquid drainage and gas production;
the high-pressure marine riser is matched with a cross joint, and the cross joint is positioned at the upper part of the engineering ship; the cross joint is mainly used for leading fluid returned from an annulus between the coiled tubing and the high-pressure riser out of a shaft and entering a production flow or a returned liquid collecting device; meanwhile, high-pressure fluid can be pumped through the four-way joint and injected into the shaft along the annular space, and well killing operation can be performed under emergency conditions;
the free end of the continuous oil pipe is communicated with the liquid storage tank, working fluid in the liquid storage tank is pumped into the shaft through an electric submersible pump or other facilities in the liquid storage tank, the third branch of the cross is communicated with the return fluid recovery tank and used for recovering the working fluid circularly returned by the shaft, the fourth branch of the cross is communicated with a throttling well killing pipeline, and high-specific gravity well killing fluid can be pumped into the shaft through the branch to kill the well if working conditions such as underground overflow occur.
In the above liquid drainage and gas production operation system, the high-pressure marine riser is used for connecting the underwater blowout preventer and extends upwards to the vicinity of the engineering ship to form a main underwater and engineering ship connecting channel;
the coiled tubing is mainly used for forming a wellbore circulation channel, circulating fluid enters from the center of the coiled tubing, flows downwards and flows out of the coiled tubing, and flows upwards into an annular space between the coiled tubing and the high-pressure marine riser to return to an engineering ship.
In the liquid drainage and gas production operation system, the upper part of the high-pressure water barrier is provided with a pressure test valve for verifying the reliability of sealing of an annulus between the coiled tubing and the high-pressure water barrier above the pressure test valve.
In the drainage gas production operation system, the end part of the high-pressure marine riser is matched with a continuous oil pipe blowout preventer, and the continuous oil pipe blowout preventer is arranged at the upper part of the cross joint;
the underwater blowout preventer and the coiled tubing blowout preventer are mainly used for closing a channel between a shaft and an engineering ship when underground overflow or other emergency situations occur, and preventing oil and gas in the shaft from gushing to the engineering ship.
In the above liquid drainage and gas production operation system, the high-pressure marine riser is lifted by the lifting frame.
In the liquid drainage gas production operation system, the rotating bearing is arranged at the matching part of the high-pressure marine riser and the lifting frame, so that the adjustment of the heading of an engineering ship can be adapted, and the torsion load on the high-pressure marine riser is avoided.
In the liquid drainage gas production operation system, the high-pressure marine riser is suspended on the engineering ship through the chuck.
In the liquid drainage and gas production operation system, the high-pressure marine riser and the continuous oil pipe are sealed through the sealing rubber sleeve.
The liquid drainage and gas production operation method of the liquid drainage and gas production operation system for the natural gas well developed at the lower wellhead comprises the following steps:
(1) connecting the high-pressure riser to an underwater wellhead in a manner of a) or b) as follows:
a) if the capacity of a crane or a hook on the engineering ship is insufficient, the underwater blowout preventer is connected to an underwater wellhead, then the crane or the hook is used for sending the high-pressure marine riser underwater, and the high-pressure marine riser is connected with the underwater blowout preventer through a connector;
b) if the crane or the hook on the engineering ship has stronger capacity, the high-pressure marine riser and the underwater blowout preventer are connected through a connector, and then the crane or the hook is used for sending the oil to the underwater wellhead to be connected;
(2) installing the cross joint on the upper part of the high-pressure marine riser, and then suspending the high-pressure marine riser on the engineering ship through a chuck, wherein the cross joint is positioned on the upper part of the engineering ship;
(3) assembling a lifting frame and a coiled tubing feeding tool on the engineering ship, lifting the lifting frame and the coiled tubing feeding tool to the upper part of the cross joint by using the crane or the big hook, and connecting the lifting frame and the cross joint;
(4) inserting the coiled tubing into the coiled tubing feeding tool, sealing the coiled tubing feeding tool and the coiled tubing, and pushing the coiled tubing to continuously penetrate through the four-way joint downwards to enter the high-pressure marine riser and to a position above the underwater blowout preventer by using the rotation of the roller;
(5) closing the underwater blowout preventer, forming a sealed space at the upper part of the underwater blowout preventer, pumping fluid into the sealed space through the coiled tubing, continuously pressurizing, opening the underwater blowout preventer after the pressure test is successful, and pushing the coiled tubing to continuously enter a shaft downwards to reach the vicinity of a gas production layer of the natural gas well by the rotation of the roller;
(6) the natural gas entering the shaft in a gas production layer can not be transferred to a well head along the shaft under the water pressure due to the fact that the shaft is filled with water due to the fact that the shaft is flooded in the current state, and the natural gas production is interrupted;
pumping the low-density fluid in the liquid storage tank into the coiled tubing, and continuously pumping the low-density fluid to a position near the tail end of the coiled tubing and a gas production layer; the low-density fluid returns from the coiled tubing to enter an annular space between the coiled tubing and a shaft, flows upwards to enter the annular space between the high-pressure marine riser and the coiled tubing, and then flows into the return liquid recovery tank through a third branch of the cross joint; continuously pumping, wherein the low-density fluid circularly discharges accumulated water filled in the shaft out of the shaft in the flowing process, and finally the shaft and the high-pressure water-resisting pipe are all low-density fluid;
(7) the roller is rotated reversely to drive the coiled tubing to move upwards, gradually leave a gas production layer, reach a position near the underwater blowout preventer, and close a switch valve of the underwater Christmas tree to enable natural gas and fluid in a shaft to be in a safe and controllable state; closing a flashboard of the underwater blowout preventer, pumping seawater through the coiled tubing, pumping the seawater to the vicinity of the underwater blowout preventer through the coiled tubing, returning the seawater upwards to enter a third branch of the cross joint along an annular space between the coiled tubing and the high-pressure riser into the returned liquid recovery tank, continuously reversing the rotary drum after the seawater is completely replaced by the low-density fluid in the high-pressure riser and the coiled tubing, withdrawing the coiled tubing, disconnecting the underwater blowout preventer from the underwater Christmas tree, and opening the flashboard of the underwater blowout preventer, so that the seawater in the high-pressure riser is discharged; and recovering the high-pressure marine riser by using the crane or the hook.
In the above operation method, because the high-pressure riser is long, the pressure testing fluid required by the pressure testing mode for closing the underwater blowout preventer is more, and once a fault occurs, the possibility of sealing failure of the underwater blowout preventer needs to be eliminated, the operation is relatively complex, and the consumed time is long, a pressure testing valve is preferably arranged on the upper part of the high-pressure riser, and the pressure testing is performed according to the following steps:
in the step (4), the coiled tubing is pushed to a position above the pressure test valve;
and (5) closing a valve of the pressure testing valve, forming a sealed space at the upper part of the valve, pumping fluid into the sealed space through the coiled tubing, and continuously pressurizing to carry out pressure testing.
In the above-mentioned operation method, the low-density fluid may be diesel oil, nitrogen foam, or other fluid.
In the above operation method, the sealing rubber sleeve in the coiled tubing running tool seals the annulus between the high-pressure riser and the coiled tubing for sealing;
when the lifting frame is lifted, the crane or the hook starts the heave compensation system, and the lifting frame bears the weight of related underwater equipment, so that when the engineering ship moves up and down along with waves, the heave compensation system performs motion compensation on the lifting frame to ensure that the lifting frame and the equipment connected under the lifting frame are in a static state and cannot generate impact load on a wellhead.
The invention has the following advantages:
1. the invention is suitable for the liquid drainage and gas production operation system of the engineering ship, establishes the communication channel between the underwater wellhead and the engineering ship by using the small-sized high-pressure marine riser, and has the advantages of simple equipment, light structure weight and convenient field operation compared with the conventional liquid drainage and gas production mode of the drilling marine riser.
2. The invention is suitable for a liquid drainage and gas production operation system of an engineering ship, the pressure testing valve is arranged on the upper part of the high-pressure marine riser, the pressure testing efficiency of the coiled tubing can be improved, and meanwhile, the pressure testing valve can be used as a second barrier for shaft safety.
3. The invention realizes the compensation of the axial motion of the high-pressure marine riser by using the heave compensation system of the derrick, does not need a complex marine riser tension device, enables the engineering ship to carry out liquid drainage and gas production operation to be possible, and reduces the requirements on the engineering ship and the liquid drainage and gas production cost.
4. The invention is suitable for the liquid drainage gas production operation system of an engineering ship, can be used for a conventional drilling operation ship and can also be used for the engineering ship, has strong adaptability and flexible and convenient operation, and can be widely applied to the drilling, completion and well repair operations of deep water oil and gas fields adopting an underwater wellhead development mode.
Drawings
Fig. 1 is a schematic structural diagram of a liquid drainage and gas production operation system suitable for an engineering ship.
The respective symbols in the figure are as follows: 1 lifting frame, 2 coiled tubing feeding tools, 3 coiled tubing blowout preventers, 4 four-way joints, 5 return liquid recovery tanks, 6 engineering ships, 7 liquid storage tanks, 8 connecting pipes, 9 rollers, 10 pressure test valves, 11 high-pressure marine risers, 12 underwater blowout preventers, 13 underwater Christmas trees, 14 well connectors, 15 well mouths, 16 sea bed surfaces, 17 gas producing layers, 18 chucks, 1001 cranes or hooks, 2001 sealing rubber cylinders, 2002 coiled tubing, 4001 return liquid channel switch valves, 4003 throttling pressure well pipeline switch valves, 4002 four-way upper switch valves and 4004 four-way lower switch valves.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
As shown in fig. 1, the liquid drainage and gas production operation system suitable for the engineering ship provided by the invention comprises a wellhead connector 14, an underwater blowout preventer 12, a high-pressure marine riser 11, a pressure test valve 10, a four-way joint 4, a lifting frame 1, a coiled tubing blowout preventer 3, a coiled tubing running tool 2, a coiled tubing roller 9, a liquid storage tank 7, a liquid storage tank 5 and the like. The concrete structure is as follows:
the high pressure riser 11 is connected at one end to a subsea blowout preventer 12 and then to a wellhead 15 via a wellhead connector 14, and at the other end extends above the vessel 6. The high-pressure marine riser 11 is hung on the engineering ship 6 through the chuck 18 and is lifted through the lifting frame 1 on the engineering ship 6, and the rotating bearing 1002 is arranged at the matching position of the high-pressure marine riser 11 and the lifting frame 1, so that the adjustment of the heading of the engineering ship can be adapted, and the torsion load on the high-pressure marine riser 11 is avoided. The coiled tubing 2002 is arranged in the high-pressure riser 11, one end of the coiled tubing 2002 extends to a shaft, the other end of the coiled tubing 2002 extends to the outside of the high-pressure riser 11, the ends of the coiled tubing 2002 and the high-pressure riser 11 are matched with the coiled tubing feeding tool 2, the coiled tubing feeding tool 2 and the coiled tubing 2002 are sealed through the sealing rubber sleeve 2001, and thus an annular space formed between the high-pressure riser 11 and the coiled tubing 2002 form a liquid drainage and gas production circulation channel. The four-way valve 4 is matched with the high-pressure marine riser 11, the four-way valve 4 is positioned at the upper part of the engineering ship 6 and is communicated with the high-pressure marine riser 11 through an upper branch and a lower branch (an upper switch valve 4002 of the four-way valve and a lower switch valve 4004 of the four-way valve are respectively arranged), the third branch of the four-way valve 4 is communicated with the returned liquid recovery tank 5, a returned liquid channel switch valve 4001 is arranged on a returned liquid channel communicated with the returned liquid channel and is used for recovering working liquid circularly returned by a shaft, the fourth branch of the four-way valve 4 is communicated with a throttling well-killing pipeline (a throttling well-killing pipeline switch valve 4003 is arranged on the throttling well-killing pipeline), and if working conditions such as underground overflow and the like occur, high-specific-gravity well-killing liquid can be pumped into the shaft through the branches to kill the shaft. The cross joint 4 is mainly used for leading fluid returning from an annulus between the coiled tubing 2002 and the high-pressure riser 11 out of a shaft and entering a production flow or a return liquid collecting device; meanwhile, fluid can be injected into the shaft through the annular space, well killing operation can be performed under emergency conditions, and the free end of the coiled tubing 2002 is wound on the roller 9 and is communicated with the liquid storage tank 7 through the connecting pipe 8. And a coiled tubing blowout preventer 3 is arranged between the cross joint 4 and the coiled tubing feeding tool 2 and is positioned in the lifting frame 1.
In addition, the upper part of the high-pressure riser 11 is provided with a pressure test valve 10, and the pressure test valve 10 is positioned below the cross joint 4 and used for verifying the reliability of sealing of an annulus between the coiled tubing 2002 and the high-pressure riser 11 above the pressure test valve 10.
In the liquid drainage and gas production operation system, a high-pressure marine riser 11 is used for connecting an underwater blowout preventer 12 and extends upwards to the vicinity of an engineering ship 6 to form a main underwater and engineering ship connecting channel; the coiled tubing 2002 is mainly used to form a channel for wellbore circulation, and circulating fluid enters from the center of the coiled tubing 2002, flows downwards out of the coiled tubing 2002, and flows upwards into an annulus between the coiled tubing 2002 and the high-pressure riser 11 to return to the engineering vessel 6.
When the liquid drainage gas production operation system is adopted to carry out liquid drainage gas production operation on a gas well developed by an underwater wellhead, the liquid drainage gas production operation is carried out according to the following steps:
the underwater blowout preventer 12 is assembled and connected on the engineering ship, and if the crane or the hook 1001 of the engineering ship is insufficient, the assembled wellhead connector 14 and the underwater blowout preventer 12 can be sent underwater by using the steel wire rope alone and installed on the wellhead 15.
The high-pressure marine riser 11 is connected to the engineering ship, the connected high-pressure marine riser 11 is sent underwater by using a crane or a hook 1001 of the engineering ship, and is connected with the underwater blowout preventer 12 through a connector (if the crane or the hook of the engineering ship has strong capacity, the wellhead connector 14, the underwater blowout preventer 12 and the high-pressure marine riser 11 can be assembled and then sent underwater together and installed on the wellhead 15).
Near the surface of the water under the water, a pressure test valve 10 is installed, and then the high-pressure marine riser 11 is continuously connected.
The four-way joint 4 is connected, and the connected four-way joint 4 and other equipment connected below the four-way joint are hung through a chuck 18.
And assembling a lifting frame 1, a coiled tubing blowout preventer 3 and a coiled tubing running tool 2 on the engineering ship. The connected lifting frame 1, the coiled tubing blowout preventer 3 and the coiled tubing running tool 2 are lifted to the upper part of the connecting cross joint 4 by a crane or a hook 1001 of the engineering ship and are connected with the connecting cross joint. The crane or hook 1001 of the engineering ship is slowly lowered, and the high-pressure marine riser 11 is connected with the cross joint 4 and the coiled tubing blowout preventer 3 to form a circulating channel between the seabed shaft and the engineering ship.
The bottom of the lifting frame 1 is provided with a rotary bearing 1002, when a crane or a hook of the engineering ship is adjusted along with the heading of the ship body, the lifting frame 1 can rotate along with the adjustment, and torsional loads can not be generated on equipment such as a marine riser and the like.
The crane or the hook of the engineering ship needs to open the heave compensation system, the lifting frame 1 bears the weight of the related underwater equipment, and when the engineering ship moves up and down along with waves, the compensation system performs motion compensation on the lifting frame 1 so as to ensure that the lifting frame 1 and the equipment connected with the lifting frame are in a static state and cannot generate impact load on a wellhead.
The coiled tubing 2002 is inserted into the coiled tubing feeding tool 2, the sealing rubber sleeve 2001 of the coiled tubing feeding tool 2 seals the coiled tubing annulus, and the roller 9 rotates to push the coiled tubing 2002 to continuously pass through the four-way joint 4 downwards to enter the high-pressure marine riser 11 at a position above the pressure test valve 10.
And closing the pressure test valve 10 to form a sealed space at the upper part of the pressure test valve, pumping fluid into the sealed space through the coiled tubing 2002, and continuously pressurizing to obtain a complete pressure test, wherein the pressure test valve 10 and the coiled tubing are sent into the sealing rubber cylinder 2001 of the tool 2 to show the high-pressure sealing reliability. After the pressure test is successful, the pressure test valve 10 is opened, the roller 9 rotates to push the coiled tubing 2002 to continue to pass through the underwater blowout preventer 12 downwards, and the coiled tubing enters the shaft to reach the position near the gas producing formation 17 of the natural gas well (if the pressure test valve is not arranged, the underwater blowout preventer 12 needs to be closed for pressure test, and because the deepwater marine riser is long, the pressure test fluid needed for pressure test is more, and once a fault occurs, the possibility of sealing failure of the underwater blowout preventer needs to be eliminated, so that the operation is relatively complex, and the consumed time is long).
In the current state of the shaft, because the shaft is flooded with water, the natural gas entering the shaft from the gas producing layer 17 cannot be transferred to the wellhead along the shaft by the water pressure, and thus the production of the natural gas is interrupted.
The liquid storage tank 7 is filled with low-density fluid (such as diesel oil, nitrogen foam and the like), the low-density fluid is pumped into the coiled tubing 2002 by the electric submersible pump and continuously pumped to the tail end of the coiled tubing 2002 and the position near the gas production layer 17, the low-density fluid returns from the coiled tubing 2002 to enter the annular space between the coiled tubing 2002 and the shaft, flows upwards to enter the annular space between the high-pressure riser 11 and the coiled tubing 2002, and enters the third branch of the four-way joint 4 (the branch is provided with a return liquid channel switch valve 4001) to enter the return liquid recovery tank 5. And (3) continuously pumping, circulating accumulated water filled in the shaft out of the shaft by the low-density fluid in the flowing process, and finally completely filling the shaft and the high-pressure marine riser 11 with the low-density fluid, wherein under the low-pressure condition, the pressure of the shaft is lower, so that the natural gas in the gas production layer 17 can smoothly enter the shaft and upwards enter a wellhead to recover normal natural gas production.
The roller 9 is rotated reversely to drive the coiled tubing 2002 to move upwards, gradually leave the gas production layer, reach a position near the underwater blowout preventer 12, close the switch valve of the underwater Christmas tree 13, and the natural gas and the fluid in the shaft are in a safe and controllable state. The method comprises the steps of closing a gate plate of an underwater blowout preventer 12, pumping seawater through a coiled tubing 2002, pumping the seawater to the position near the underwater blowout preventer 12 through the coiled tubing 2002, returning the seawater upwards to enter a return liquid recovery tank 5 along the third branch of a cross joint 4 along the annular space between the coiled tubing 2002 and a high-pressure marine riser 11, replacing the seawater with low-density fluid in the high-pressure marine riser 11 and the coiled tubing 2002, reversely rotating a roller 9, withdrawing the coiled tubing 2002, disconnecting the connection between the underwater blowout preventer 12 and an underwater Christmas tree 13, opening the gate plate of the underwater blowout preventer 12, enabling the seawater to be in the high-pressure marine riser 11 at the moment, avoiding oil spill pollution, and recovering underwater equipment such as the high-pressure marine riser by using an engineering ship crane or a hook so as to finish liquid drainage and gas production operation.
Claims (6)
1. A liquid drainage and gas production operation system suitable for an engineering ship comprises a high-pressure marine riser and a continuous oil pipe;
one end of the high-pressure marine riser is connected with an underwater wellhead, and an underwater blowout preventer is arranged at the underwater wellhead;
the other end of the high-pressure marine riser extends above the engineering ship;
the coiled tubing is arranged in the high-pressure marine riser, one end of the coiled tubing extends to a shaft, the other end of the coiled tubing extends to the outside of the high-pressure marine riser, and the matching part of the coiled tubing and the end part of the high-pressure marine riser is in sealing arrangement; an annular space formed between the high-pressure marine riser and the coiled tubing form a circulating channel for liquid drainage and gas production;
the high-pressure marine riser is matched with a cross joint, and the cross joint is positioned at the upper part of the engineering ship; the third branch of the cross is communicated with a return liquid recovery tank, and the fourth branch of the cross is communicated with a throttling well-killing pipeline;
the free end of the continuous oil pipe is communicated with the liquid storage tank;
the end part of the high-pressure marine riser is matched with a continuous oil pipe blowout preventer, and the continuous oil pipe blowout preventer is arranged at the upper part of the cross joint;
the high-pressure marine riser is lifted by a lifting frame, and a rotary bearing is arranged at the matching position of the high-pressure marine riser and the lifting frame;
compensating the axial motion of the high-pressure marine riser by using a heave compensation system of a derrick on an engineering ship;
the operation method of the liquid drainage and gas production operation system comprises the following steps:
(1) connecting the high-pressure riser to an underwater wellhead in a manner of a) or b) as follows:
a) connecting the underwater blowout preventer to an underwater wellhead, then sending the high-pressure marine riser to the underwater by using a crane or a hook on the engineering ship, and connecting the high-pressure marine riser with the underwater blowout preventer through a connector;
b) connecting the high-pressure marine riser and the underwater blowout preventer through a connector, and then sending the high-pressure marine riser and the underwater blowout preventer to an underwater wellhead by using a crane or a hook on the engineering ship;
(2) installing the cross joint on the upper part of the high-pressure riser, and then suspending the high-pressure riser on the engineering ship through a chuck, wherein the cross joint is positioned on the upper part of the engineering ship;
(3) assembling a lifting frame and a coiled tubing feeding tool on the engineering ship, lifting the lifting frame and the coiled tubing feeding tool to the upper part of the cross joint by using the crane or the big hook, and connecting the lifting frame and the cross joint;
(4) inserting the coiled tubing into the coiled tubing feeding tool, sealing the coiled tubing feeding tool and the coiled tubing, and pushing the coiled tubing to continuously penetrate through the four-way joint downwards to enter the high-pressure marine riser and to a position above the underwater blowout preventer by using the rotation of the roller;
(5) closing the underwater blowout preventer, forming a sealed space at the upper part of the underwater blowout preventer, pumping fluid into the sealed space through the coiled tubing, continuously pressurizing, opening the underwater blowout preventer after the pressure test is successful, and pushing the coiled tubing to continuously enter a shaft downwards to reach the vicinity of a gas production layer of the natural gas well by the rotation of the roller;
(6) pumping the low-density fluid in the liquid storage tank into the coiled tubing, and continuously pumping the low-density fluid to a position near the tail end of the coiled tubing and a gas production layer; the low-density fluid returns from the coiled tubing to enter an annular space between the coiled tubing and a shaft, flows upwards to enter the annular space between the high-pressure marine riser and the coiled tubing, and then flows into the return liquid recovery tank through a third branch of the cross joint; continuously pumping, wherein the low-density fluid circularly discharges accumulated water filled in the shaft out of the shaft in the flowing process, and finally the shaft and the high-pressure water-resisting pipe are all low-density fluid;
(7) the roller is rotated reversely to drive the coiled tubing to move upwards, gradually leave a gas production layer, reach a position near the underwater blowout preventer, and close a switch valve of the underwater Christmas tree to enable natural gas and fluid in a shaft to be in a safe and controllable state; closing a flashboard of the underwater blowout preventer, pumping seawater through the coiled tubing, pumping the seawater to the vicinity of the underwater blowout preventer through the coiled tubing, returning the seawater upwards to enter a third branch of the cross joint along an annular space between the coiled tubing and the high-pressure riser into the returned liquid recovery tank, continuously rotating the roller in the reverse direction after the seawater is completely replaced by the low-density fluid in the high-pressure riser and the coiled tubing, withdrawing the coiled tubing, disconnecting the connection between the underwater blowout preventer and the underwater Christmas tree, and opening the flashboard of the underwater blowout preventer, so that the seawater in the high-pressure riser is discharged; recovering the high-pressure marine riser by using the crane or the hook;
when the lifting frame is lifted, the crane or the hook starts the heave compensation system.
2. The liquid drainage and gas production operation system according to claim 1, characterized in that: and a pressure testing valve is arranged at the upper part of the high-pressure water-proof part.
3. The liquid drainage and gas production operation system according to claim 2, characterized in that: the high-pressure marine riser is suspended on the engineering ship through a chuck.
4. The liquid drainage gas production operation system according to claim 3, characterized in that: and the high-pressure marine riser and the continuous oil pipe are sealed by a sealing rubber sleeve.
5. The liquid drainage and gas production operation system according to claim 4, characterized in that: when the high-pressure marine riser is matched with the pressure testing valve, pressure testing is carried out according to the following steps:
in the step (4), the coiled tubing is pushed to a position above the pressure test valve;
and (5) closing a valve of the pressure testing valve, forming a sealed space at the upper part of the valve, pumping fluid into the sealed space through the coiled tubing, and continuously pressurizing to carry out pressure testing.
6. The liquid drainage and gas production operation system according to claim 5, wherein: and a sealing rubber cylinder in the coiled tubing feeding tool seals an annular space between the high-pressure marine riser and the coiled tubing for sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010453628.2A CN111561299B (en) | 2020-05-26 | 2020-05-26 | Liquid drainage and gas production operation system and operation method suitable for engineering ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010453628.2A CN111561299B (en) | 2020-05-26 | 2020-05-26 | Liquid drainage and gas production operation system and operation method suitable for engineering ship |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111561299A CN111561299A (en) | 2020-08-21 |
| CN111561299B true CN111561299B (en) | 2022-05-17 |
Family
ID=72068425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010453628.2A Active CN111561299B (en) | 2020-05-26 | 2020-05-26 | Liquid drainage and gas production operation system and operation method suitable for engineering ship |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111561299B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113062710A (en) * | 2021-02-26 | 2021-07-02 | 河北华北石油荣盛机械制造有限公司 | Portable underwater butt joint throttling device |
| CN113006717B (en) * | 2021-03-02 | 2024-03-08 | 广州海洋地质调查局 | Marine underwater coiled tubing equipment and method |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8171989B2 (en) * | 2000-08-14 | 2012-05-08 | Schlumberger Technology Corporation | Well having a self-contained inter vention system |
| US8122965B2 (en) * | 2006-12-08 | 2012-02-28 | Horton Wison Deepwater, Inc. | Methods for development of an offshore oil and gas field |
| WO2012149080A2 (en) * | 2011-04-27 | 2012-11-01 | Bp Corporation North America Inc. | Marine subsea riser systems and methods |
| CN102654023B (en) * | 2012-05-10 | 2014-07-02 | 徐梓辰 | Main and auxiliary underwater system for deepwater drilling and setting method thereof |
| CN102720453B (en) * | 2012-06-04 | 2015-06-10 | 遂宁市华旭科技有限公司 | Method and device for mechanically removing sand and draining liquid from pit shaft of oil/gas well in underbalanced state |
| CN203097850U (en) * | 2012-12-25 | 2013-07-31 | 中国海洋石油总公司 | Emergency release device of deep water drilling riser |
| NL2013680B1 (en) * | 2014-10-24 | 2016-10-05 | Itrec Bv | Offshore drilling system, vessel and method. |
| CN106089127B (en) * | 2016-07-27 | 2018-06-15 | 西南石油大学 | A kind of semi-active type overhead traveling crane heave compensation system for deepwater drilling operation |
| AU2017363205B2 (en) * | 2016-11-17 | 2022-10-13 | David C. Wright | Motion compensating floors system and method |
| CN107355205A (en) * | 2017-08-08 | 2017-11-17 | 广州海洋地质调查局 | A kind of hydraulic slotted liner technique method of semisubmersible drilling platform or drill ship |
| CN107558940B (en) * | 2017-10-12 | 2019-08-09 | 中国海洋石油集团有限公司 | A kind of light-duty well repairing device in deep water hydrocarbon field and method |
-
2020
- 2020-05-26 CN CN202010453628.2A patent/CN111561299B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111561299A (en) | 2020-08-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10107053B2 (en) | Three-way flow sub for continuous circulation | |
| US20120111572A1 (en) | Emergency control system for subsea blowout preventer | |
| US20150240582A1 (en) | Continuous flow system for drilling oil and gas wells | |
| WO1995017576A1 (en) | Dual concentric string high pressure riser | |
| US9038728B1 (en) | System and method for diverting fluids from a wellhead by using a modified horizontal christmas tree | |
| US20110127040A1 (en) | Assembly and method for subsea well drilling and intervention | |
| US9062498B2 (en) | Riserless, pollutionless drilling system | |
| US20140190701A1 (en) | Apparatus and method for subsea well drilling and control | |
| CN111561299B (en) | Liquid drainage and gas production operation system and operation method suitable for engineering ship | |
| US5875848A (en) | Weight management system and method for marine drilling riser | |
| GB2362667A (en) | Riser system for small diameter riser which also allows larger diameter access to a wellhead | |
| US8720580B1 (en) | System and method for diverting fluids from a damaged blowout preventer | |
| CN107558940B (en) | A kind of light-duty well repairing device in deep water hydrocarbon field and method | |
| WO2017218594A1 (en) | Early production system for deep water application | |
| US20220307322A1 (en) | Maritime drilling with fluid reverse circulation without using drilling riser | |
| CN201620887U (en) | Machine-acquiring testing pipe-string for floating drilling rig | |
| Hammett et al. | First floating production facility-Argyll | |
| WO2021127855A1 (en) | Double-layer continuous pipe double-gradient drilling system | |
| Moreira et al. | Guideline/ess Completions Offshore Brazil | |
| CN114856504B (en) | Well repair system for shallow water underwater horizontal christmas tree and operation method thereof | |
| CN202360053U (en) | Tool transporting device for deepwater drilling | |
| US9670755B1 (en) | Pump module systems for preventing or reducing release of hydrocarbons from a subsea formation | |
| Zhong et al. | LiuHua Oil/Gas Project: First Self-Developed Completion Campaign Using Subsea Horizontal Trees in South China Sea | |
| Ribeiro et al. | Deepwater subsea completion: State of the art and future trends | |
| WO2023073022A1 (en) | Subsea well head assembly for use in riserless drilling operations |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |