CN204532070U - A kind of well system based on subsea pump pressure control - Google Patents
A kind of well system based on subsea pump pressure control Download PDFInfo
- Publication number
- CN204532070U CN204532070U CN201520193253.5U CN201520193253U CN204532070U CN 204532070 U CN204532070 U CN 204532070U CN 201520193253 U CN201520193253 U CN 201520193253U CN 204532070 U CN204532070 U CN 204532070U
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- subsea pump
- suction module
- drilling
- drill ship
- system based
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Abstract
The utility model relates to a kind of well system based on subsea pump pressure control, it is characterized in that: it comprises setting drill ship across the sea, drill ship is arranged a drilling fluid feedway and a control device, drilling fluid feedway connects the liquid feeding end of a water tap by a liquid manifold, water tap is fixedly connected on one and is arranged on the midship derrick of drilling well, the outlet end of water tap is rotationally connected a drilling rod top, a drill bit is fastenedly connected in the bottom of drilling rod, a sheathed suction module in drilling rod bottom, it is inner that drill bit enters low pressure well head through suction module, outer tube wall one side ducts of suction module is provided with a choke valve, control device electrical connection one is positioned at the electric installation on drill ship, electric installation controls to be electrically connected a motor with service line by one, the output of motor connects a subsea pump, the entrance of subsea pump connects a flexible pipe and arranges a pressure flow sensor in entrance, motor and subsea pump are separately positioned on mud line.
Description
Technical field
The utility model relates to a kind of well system based on subsea pump pressure control, belongs to marine mining engineering field.
Background technology
Gas hydrates are a kind of white crystalline solid materials, it can only exist under certain temperature and pressure condition, and General Requirements temperature is about 0 ~ 10 DEG C, pressure is higher than 10Mpa, if temperature raises or pressure reduces, methane gas wherein then can be overflowed, and gas hydrates are just tending towards decomposing.A large amount of gas hydrates layer may be there is under deepwater high-pressure low temperature environment, due to the temperature and pressure environment of deep water, within the buried depth of gas hydrates is generally below mud line 600m, for the deepwater drilling technology and equipment of routine, the method of there is no sets up the well control such as marine riser and preventer system, therefore cannot implement conventional drilling well and well control operation.Even if conventional deep water can be used to bore completion well control equipment, but length reaches the marine riser of km and the installation of complicated blowout preventer system and controls is all quite complicated, the most of operations time is caused to expend in the installation and removal process of marine riser blowout preventer system, operating efficiency is extremely low, drilling apparatus costly, deficiency in economic performance.
In addition, cover and usually there is free gas under gas hydrates cap rock, when drilling well is to this stratum, free gas very easily invades pit shaft, destroys pit shaft equilibrium conditions, thus causes a series of well control problem.When natural gas hydrate stratum left by brill, stratum equilibrium conditions can be broken, cause gas hydrate dissociation, if decomposition rate can not get effective control, will destroy the stability of natural gas hydrate stratum and cause the problem such as to collapse of well head, therefore gas hydrates drilling prospection faces great risk.
Summary of the invention
For the problems referred to above, the purpose of this utility model is to provide a kind of well system based on subsea pump pressure control, can control the well control risk because shallow formation gas decomposition of hydrate causes.
For achieving the above object, the utility model takes following technical scheme: a kind of well system based on subsea pump pressure control, it is characterized in that: it comprises setting drill ship across the sea, described drill ship is provided with a drilling fluid feedway and a control device, described drilling fluid feedway connects the liquid feeding end of a water tap by a liquid manifold, a derrick is fixedly connected with in the middle part of described drill ship, described water tap is fixedly connected on described derrick, the outlet end of described water tap is rotationally connected a drilling rod top, a drill bit is fastenedly connected in the bottom of described drilling rod, at the sheathed suction module in described drilling rod bottom, fasteningly bottom described suction module be arranged on low pressure well head, below mud line is stretched in the bottom of described suction module, it is inner that described drill bit enters described low pressure well head through described suction module, the outer wall of described suction module is symmetrically arranged with two pipelines, pipeline described in side is provided with a choke valve, a conduit is provided with bottom described suction module, described conduit stretches in described low pressure well head, the ship side of described drill ship end is fixedly connected with an anchor chain, the anchor end of described anchor chain is fixed on target marine site, described drill ship is provided with a winch near described anchor chain place, described control device electrical connection one is positioned at the electric installation on described drill ship, described electric installation controls to be electrically connected a motor with service line by one, the output of described motor connects a subsea pump, the entrance of described subsea pump connects a flexible pipe, and the entrance of described subsea pump is provided with a pressure flow sensor, described motor and subsea pump are separately positioned on mud line.
Described subsea pump adopts the leaf disk pump of the gentle three-phase mixed transferring of solid, liquid
The sealing device of drilling rod described in one rotational support is set on the top of described suction module inwall, between the described suction module inwall bottom described sealing device and drilling-rod external wall, forms an annular space.
Described drill ship adopts deep water investigation vessel or multifunctional support vessel, and described drill bit adopts ocean floor drilling well dynamic drill bit, and described drilling fluid is the row sea drilling fluid directly entering seabed.
The utility model is owing to taking above technical scheme, it has the following advantages: 1, the utility model is owing to being provided with a drilling rod, a drill bit is fixedly connected with at the end of drilling rod, a suction module is provided with near mud line, below mud line is stretched in suction module bottom, drive it to transfer by the motor on the derrick of a drill ship and pass suction module and arrive target marine site, therefore the utility model well system can not use marine riser and preventer, drill ship can adopt the small-scale workshops ship drilling wells such as deep water investigation vessel, reduces drilling cost.2, the utility model is provided with a drilling fluid feedway, utilizes the potential energy of drilling fluid in drilling rod to drive bit operation for mechanical energy, effectively can reduce the temperature value that drilling rod and drilling fluid friction cause, and is conducive to suppressing gas hydrate dissociation.3, the utility model owing to being provided with a subsea pump and a motor near mud line, subsea pump connects suction module by a flexible pipe, subsea pump is driven by the drilling fluid discharge of cutting carring to away from ocean floor drilling well head place by motor, in conjunction with double-gradient well drilling and controlled pressure drilling principle, the density range using drilling fluid can be expanded, solve a difficult problem for deep sea drilling pressure window narrows, simplify ocean floor drilling casing programme.4, the utility model is provided with a pressure flow sensor in the entrance that subsea pump is connected with flexible pipe, a choke valve on the pipeline of a suction module, control the console device on Signal transmissions to drill ship that detects and electric installation with service line by one, when there being the gas mediums such as free gas to invade in ocean floor drilling well, control the gas mediums such as free gas by the console device regulation and control rotating speed of subsea pump and throttle valve opening to invade, make ocean floor drilling well head pressure near certain steady state value, the force value that can realize ocean floor drilling well head is stablized, improve the safety of operation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in detail.
As shown in Figure 1, the utility model proposes a kind of well system based on subsea pump pressure control, this system comprises setting drill ship 1 across the sea, and drill ship 1 is provided with a drilling fluid feedway 2, and drilling fluid feedway 2 connects the liquid feeding end of a water tap 4 by a liquid manifold 3.A derrick 5 is fixedly connected with in the middle part of drill ship 1, water tap 4 is fixedly connected on derrick 5, the outlet end of water tap 4 is rotationally connected drilling rod 6 top, be fastenedly connected a drill bit 7 in the bottom of drilling rod 6, drilling rod 6 rotates under being fixedly connected on the driving of the motor (not shown) on derrick 5 one.A sheathed suction module 8 in drilling rod 6 bottom, fasteningly bottom suction module 8 is arranged on low pressure well head, and below mud line is stretched in the bottom of suction module 8, and it is inner that drill bit 7 enters low pressure well head through suction module 8.The outer wall of suction module 8 is symmetrically arranged with two pipelines 9, a side ducts 9 is provided with a choke valve.Bottom suction module 8, be provided with a conduit 10, conduit 10 stretches in low pressure well head, and when force value in ocean floor drilling is less than seawater hydrostatic pressing force value, the pressure relying on drilling fluid to produce in conduit 10 can effectively prevent seawater from flowing in ocean floor drilling.The ship side of drill ship 1 end is fixedly connected with an anchor chain 11, and the anchor end of anchor chain 11 is fixed on target marine site.Drill ship 1 is provided with a winch 12 near anchor chain 11 place.
Drill ship 1 is also provided with a control device 13, control device 13 is electrically connected one and is positioned at electric installation 14 on drill ship 1, electric installation 14 controls to be electrically connected a motor 16 with service line 15 by one, the output of motor 16 connects a subsea pump 17, the entrance of subsea pump 17 connects a flexible pipe 18, and the entrance of subsea pump 17 is provided with a pressure flow sensor.Wherein, motor 16 and subsea pump 17 are separately positioned on mud line.
In above-described embodiment, subsea pump 17 can adopt the leaf disk pump of the gentle three-phase mixed transferring of solid, liquid.
In above-described embodiment, the sealing device (not shown) of one rotational support drilling rod 6 is set on the top of suction module 8 inwall, along with drilling rod 6 rotates, sealing device can make the top of suction module 8 and the wall contacts place of drilling rod 6 clamp, form an annular space at suction module 8 inwall bottom sealing device and between drilling rod 6 outer wall, the drilling fluid of cutting carring can by this annular circulation in suction module 8.
In above-described embodiment, drill ship 1 can adopt deep water investigation vessel or multifunctional support vessel, and drill bit 7 can adopt ocean floor drilling well dynamic drill bit, and drilling fluid is the row sea drilling fluid that directly can enter seabed.
During utility model works, it comprises the following steps:
1) drill ship 1 is fixed on target marine site by the anchor chain 11 starting drill ship 1, adopts jet drilling mode to be drilled with a short distance low pressure well head.
2) control below drilling rod 6 precession mud line, and be arranged on fastening for suction module 8 on mud line, and just to low pressure well head.
3) transferred the motor 16 and subsea pump 17 to mud line that are connected with control and service line 15 by the wire rope (not shown) on winch 12, adopt underwater robot to complete flexible pipe 18 and be connected with pipeline 9 and fixing with service line 15 on anchor chain 11 will be controlled.
4) utilize the potential energy of drilling fluid for mechanical energy drive drill bit 7 work, the drilling fluid of cutting carring is by bore hole annulus being returned the suction module 8 to ocean floor drilling mouth simultaneously, subsea pump 17 is entered through the annular space of suction module 8 inside and the outlet of pipeline 9, be discharged into away from ocean floor drilling well head place, simultaneously by pressure flow Sensor monitoring to signal by controlling to transfer to console device 13 and electric installation 14 with service line 15.
5) regulate ocean floor drilling pressure balance: when ocean floor drilling well head by other gas mediums such as free gas affect cause pressure to increase time, utilize console device 13 by controlling to regulate with the aperture of service line 15 pairs of choke valves and the rotating speed of subsea pump 17, the force value controlling subsea pump 17 and flexible pipe 18 connectivity port continues to remain near a certain steady state value, realizes ocean floor drilling well head pressure and stablizes.
In above-described embodiment, in step 3) in, after flexible pipe 18 is connected with pipeline 9, the pipeline 9 being positioned at suction module 8 opposite side arranges a safety overflow valve (not shown), when ocean floor drilling well head pressure value exceeds a safety value, the drilling fluid that can control cutting carring is discharged by safety overflow valve, thus ensures that ocean floor drilling well head pressure value is in a safety value, simultaneously can also as the backup line of connecting hose 18.
The various embodiments described above are only for illustration of the utility model; wherein the structure, connected mode etc. of each parts all can change to some extent; every equivalents of carrying out on the basis of technical solutions of the utility model and improvement, all should not get rid of outside protection domain of the present utility model.
Claims (5)
1. the well system based on subsea pump pressure control, it is characterized in that: it comprises setting drill ship across the sea, described drill ship is provided with a drilling fluid feedway and a control device, described drilling fluid feedway connects the liquid feeding end of a water tap by a liquid manifold, a derrick is fixedly connected with in the middle part of described drill ship, described water tap is fixedly connected on described derrick, the outlet end of described water tap is rotationally connected a drilling rod top, a drill bit is fastenedly connected in the bottom of described drilling rod, at the sheathed suction module in described drilling rod bottom, fasteningly bottom described suction module be arranged on low pressure well head, below mud line is stretched in the bottom of described suction module, it is inner that described drill bit enters described low pressure well head through described suction module, the outer wall of described suction module is symmetrically arranged with two pipelines, pipeline described in side is provided with a choke valve, a conduit is provided with bottom described suction module, described conduit stretches in described low pressure well head, the ship side of described drill ship end is fixedly connected with an anchor chain, the anchor end of described anchor chain is fixed on target marine site, described drill ship is provided with a winch near described anchor chain place,
Described control device electrical connection one is positioned at the electric installation on described drill ship, described electric installation controls to be electrically connected a motor with service line by one, the output of described motor connects a subsea pump, the entrance of described subsea pump connects a flexible pipe, and the entrance of described subsea pump is provided with a pressure flow sensor, described motor and subsea pump are separately positioned on mud line.
2. a kind of well system based on subsea pump pressure control as claimed in claim 1, is characterized in that: described subsea pump adopts the leaf disk pump of the gentle three-phase mixed transferring of solid, liquid
3. a kind of well system based on subsea pump pressure control as claimed in claim 1, it is characterized in that: the sealing device that drilling rod described in a rotational support is set on the top of described suction module inwall, between the described suction module inwall bottom described sealing device and drilling-rod external wall, form an annular space.
4. a kind of well system based on subsea pump pressure control as claimed in claim 2, it is characterized in that: the sealing device that drilling rod described in a rotational support is set on the top of described suction module inwall, between the described suction module inwall bottom described sealing device and drilling-rod external wall, form an annular space.
5. a kind of well system based on subsea pump pressure control as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: described drill ship adopts deep water investigation vessel or multifunctional support vessel, described drill bit adopts ocean floor drilling well dynamic drill bit, and described drilling fluid is the row sea drilling fluid directly entering seabed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520193253.5U CN204532070U (en) | 2015-04-01 | 2015-04-01 | A kind of well system based on subsea pump pressure control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520193253.5U CN204532070U (en) | 2015-04-01 | 2015-04-01 | A kind of well system based on subsea pump pressure control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204532070U true CN204532070U (en) | 2015-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201520193253.5U Withdrawn - After Issue CN204532070U (en) | 2015-04-01 | 2015-04-01 | A kind of well system based on subsea pump pressure control |
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| CN (1) | CN204532070U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763333A (en) * | 2015-04-01 | 2015-07-08 | 中国海洋石油总公司 | Drilling system and method based on subsea pump pressure control |
| CN108894776A (en) * | 2018-07-06 | 2018-11-27 | 常州大学 | A kind of simulation experimental provision of the deep water without marine riser drilling well the Hydraulic Design |
| CN115075763A (en) * | 2022-06-02 | 2022-09-20 | 中国地质科学院勘探技术研究所 | Suction module capable of being repeatedly put into sealing device and technological method |
| CN115142815A (en) * | 2021-03-31 | 2022-10-04 | 派格水下技术(广州)有限公司 | Underwater drilling solid waste cleaning system, drilling and cementing operation system and method thereof |
-
2015
- 2015-04-01 CN CN201520193253.5U patent/CN204532070U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763333A (en) * | 2015-04-01 | 2015-07-08 | 中国海洋石油总公司 | Drilling system and method based on subsea pump pressure control |
| CN108894776A (en) * | 2018-07-06 | 2018-11-27 | 常州大学 | A kind of simulation experimental provision of the deep water without marine riser drilling well the Hydraulic Design |
| CN108894776B (en) * | 2018-07-06 | 2023-02-17 | 常州大学 | Experimental device for simulating deepwater non-riser drilling hydraulic design |
| CN115142815A (en) * | 2021-03-31 | 2022-10-04 | 派格水下技术(广州)有限公司 | Underwater drilling solid waste cleaning system, drilling and cementing operation system and method thereof |
| CN115075763A (en) * | 2022-06-02 | 2022-09-20 | 中国地质科学院勘探技术研究所 | Suction module capable of being repeatedly put into sealing device and technological method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150805 Effective date of abandoning: 20170926 |