CN113107445B - Chemical agent underwater storage and injection system and control method - Google Patents
Chemical agent underwater storage and injection system and control method Download PDFInfo
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- CN113107445B CN113107445B CN202110521057.6A CN202110521057A CN113107445B CN 113107445 B CN113107445 B CN 113107445B CN 202110521057 A CN202110521057 A CN 202110521057A CN 113107445 B CN113107445 B CN 113107445B
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- valve
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- 239000013043 chemical agent Substances 0.000 title claims abstract description 85
- 238000002347 injection Methods 0.000 title claims abstract description 71
- 239000007924 injection Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 210000001503 joint Anatomy 0.000 claims abstract description 7
- 239000013535 sea water Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000003814 drug Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002455 scale inhibitor Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0007—Equipment or details not covered by groups E21B15/00 - E21B40/00 for 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
- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Pipeline Systems (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
The invention discloses a chemical agent underwater storage and injection system and a control method, the system comprises a tank body, a transport pipe, a chemical agent injection joint, an electromagnetic valve, a pressure tester and a controller, the tank body storing the chemical agent is arranged underwater, the chemical agent can be conveyed to a drilling device through the transport pipe and the chemical agent injection joint, the injection flow rate of the underwater chemical agent is controlled by the electromagnetic valve, and the hydraulic pressure of the butt joint of the chemical agent injection joint and the drilling device is detected by the pressure tester, so that the chemical agent underwater storage and injection are realized. The chemical agent underwater storage and injection system and the control method disclosed by the invention reduce the number of chemical agent pipelines in the umbilical cable, save the area of an ocean engineering platform, and improve the development economy of deep and open sea oil and gas fields and marginal oil and gas fields.
Description
Technical Field
The invention relates to the technical field of offshore oil and gas field development, in particular to an underwater chemical agent storage and injection system and a control method.
Background
In the development of offshore oil and gas fields, in order to prevent hydrate from generating, corroding, scaling and the like in an underwater production system, chemical agents such as methanol, glycol, hydrate low-dose inhibitors, corrosion inhibitors, scale inhibitors and the like need to be injected. The current conventional solution is to arrange a chemical agent system on an ocean engineering platform and transport the chemical agent system to the injection point of the underwater production system through an umbilical cable or a sea pipe. The conventional scheme faces the following problems: the manufacturing and installation costs of umbilicals rise rapidly with increasing tie-back distances for subsea production systems, with the increasing umbilical costs increasing the field development costs when the tie-back distances are too long. For deep open sea fields, the significant cost of the umbilical may be a major factor limiting the development of the field.
The existing chemical agent system is arranged on an ocean engineering platform and cannot realize the underwater on-site storage and injection of chemical agents, so that the number of chemical agent pipelines in an umbilical cable is large, the umbilical cable occupies the ocean engineering platform, the storage space of the ocean engineering platform is compressed, and the economy of the development of deep and open sea oil and gas fields and marginal oil and gas fields is reduced.
Disclosure of Invention
The invention aims to provide a chemical agent underwater storage and injection system and a control method, which are used for solving the problems that the existing chemical agent cannot be stored and injected underwater, the number of chemical agent pipelines in an umbilical cable is large, the occupied area of an ocean engineering platform is large, and the like.
The invention provides a chemical agent underwater storage and injection system, which comprises a tank body, a conveying pipe, a chemical agent injection joint, an electromagnetic valve, a pressure tester and a controller, wherein the tank body is arranged underwater; the chemical agent injection joint is used for being in butt joint with an underwater part of the drilling device, and the pressure measuring instrument is used for being arranged at the butt joint of the chemical agent injection joint and the drilling device and used for monitoring hydraulic pressure in the drilling device; the tank body is communicated with the chemical agent injection joint through the conveying pipe; the electromagnetic valve is arranged on the conveying pipe; the controller is arranged on water, and the electromagnetic valve and the pressure measuring instrument are connected with the controller through signal lines.
Preferably, a piston is arranged at the upper part of the tank body, a medicament inlet is arranged on the piston, a medicament outlet is arranged at the bottom of the tank body, and a base is arranged at the bottom of the tank body.
Preferably, the underwater robot further comprises an underwater foundation, and the base is arranged on the underwater foundation.
Preferably, two ends of the conveying pipe are respectively butted with the agent outlet through a first underwater joint and the chemical agent injection joint through a second underwater joint.
The invention discloses a control method for underwater storage and injection of chemical agents, which adopts the chemical agent underwater storage and injection system and comprises the following steps:
step S1: obtaining a relation zeta = f (K) of a valve local resistance coefficient zeta of the electromagnetic valve and a valve opening K through experiments;
step S2: the controller obtains a hydraulic value of the pressure measuring instrument and calculates a valve local resistance coefficient zeta of the electromagnetic valve;
and step S3: the controller sends an opening degree control instruction to the electromagnetic valve according to the calculated valve opening K of the electromagnetic valve;
and step S4: after the electromagnetic valve is opened, the chemical agent stored in the tank body is injected into the chemical agent injection joint through the conveying pipe.
Further, the step S2 specifically includes the following steps:
step S21: calculating the valve local resistance coefficient of the electromagnetic valve, wherein the calculation expression is as follows:
in the formula: rho is the density of the seawater; g is gravity acceleration; h is the water depth of the chemical agent injection joint; Δ P is the pressure difference between the seawater side of the piston and the inside of the tank; v is the chemical injection flow rate; h is f Is the on-way resistance loss of the chemical agent during the flow in the tube; h is a total of j Is the valve local resistance loss; p is a hydraulic value detected by the pressure tester;
wherein the path resistance of the chemical agent flowing in the tube is lost f The calculation expression of (a) is:
in the formula, lambda is the pipeline friction coefficient of the conveying pipe; l is the length of the injection transport pipe; d is the inner diameter of the transport pipe;
valve local resistance loss h of electromagnetic valve j The calculation expression of (a) is:
in the formula, zeta is the valve local resistance coefficient of the electromagnetic valve;
step S22: and calculating the valve opening K of the electromagnetic valve according to the relationship zeta = f (K) of the valve local resistance coefficient of the electromagnetic valve and the valve opening K.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a chemical agent underwater storage and injection system and a control method, wherein a tank body storing a chemical agent is arranged underwater, the chemical agent can be conveyed to a drilling device through a conveying pipe and a chemical agent injection joint, the injection flow rate of the chemical agent underwater is controlled by an electromagnetic valve, and the hydraulic pressure at the butt joint of the chemical agent injection joint and the drilling device is detected by a pressure measuring instrument, so that the chemical agent underwater storage and injection are realized. The chemical agent underwater storage and injection system and the control method disclosed by the invention reduce the number of chemical agent pipelines in the umbilical cable, save the area of an ocean engineering platform, and improve the development economy of deep and open sea oil and gas fields and marginal oil and gas fields.
Drawings
Fig. 1 is a schematic structural diagram of a chemical agent underwater storage and injection system provided in embodiment 1 of the present invention.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
Embodiment 1 provides a chemical agent underwater storage and injection system, the structure of which will be described in detail below.
Referring to fig. 1, the chemical agent underwater storage and injection system includes a tank 1, a transport pipe 2, a chemical agent injection joint 3, an electromagnetic valve 4, a pressure gauge 5, a controller 6, and an underwater base 8, which is used in cooperation with a drilling device 7.
The tank body 1 is arranged underwater, the chemical agent injection joint 3 is in butt joint with the underwater part of the drilling device 7, and the pressure measuring instrument 5 is arranged at the butt joint of the chemical agent injection joint 3 and the drilling device 7 and used for monitoring the hydraulic pressure in the drilling device 7; the tank body 1 is communicated with the chemical agent injection joint 3 through a conveying pipe 2; the solenoid valve 4 is arranged on the transport pipe 2.
The controller 6 is arranged on water, and the electromagnetic valve 4 and the pressure measuring instrument 5 are connected with the controller 6 through signal lines.
The chemical agent is stored in the tank body 1, a piston 11 is arranged at the upper part of the tank body 1, an agent inlet 10 is arranged on the piston 11, an agent outlet is arranged at the bottom of the tank body 1, and a base 12 is arranged at the bottom surface of the tank body 1. The base 12 is fixed to the underwater foundation 8.
Specifically, both ends of the transport pipe 2 are respectively butted with the chemical agent outlet through a first underwater joint 21 and the chemical agent injection joint 3 through a second underwater joint 22. The transport pipe 2 is used for connecting the tank body 1 and the chemical agent injection joint 3.
Specifically, the pressure measuring instrument 5 may employ a water pressure measuring instrument in the water supply pipe.
In particular, the drilling device 7 may be a subsea pipeline, a production line, a christmas tree, etc. associated with drilling a well and drilling thereof.
The electromagnetic valve 4 is used for controlling the injection flow rate of the underwater chemical agent, and in order to prevent seawater from eroding the electromagnetic valve 4, the electromagnetic valve 4 is fixed on an underwater foundation 8. The underwater foundation 8 fixes the tank body 1 in a detachable mode, and the tank body 1 can be detached and replaced.
In engineering practice, the pressure measuring instrument 5 can be integrated in an underwater control module during the exploitation of an offshore oil field or can be independently arranged; the controller 6 can be wholly or partially integrated in the central control system or can be arranged independently; when the pressure measuring instrument 5 is integrated in the underwater control module, the underwater control module is connected with the central control system through a signal line.
Example 2
step S1: obtaining a relation ζ = f (K) of a valve local resistance coefficient ζ and a valve opening K of the electromagnetic valve 4 through experiments;
step S2: the controller 6 obtains the hydraulic pressure value of the pressure measuring instrument 5 and calculates the valve local resistance coefficient zeta of the electromagnetic valve 4, and the method specifically comprises the following steps:
step S21: calculating the local valve resistance coefficient ζ of the electromagnetic valve 4 according to an expression derived from the energy balance, wherein the calculation expression is as follows:
in the formula: rho is the density of the seawater; g is the acceleration of gravity; h is the water depth at the chemical agent injection joint 3; Δ P is the pressure difference between the seawater side of the piston 11 and the tank inner side; v is the chemical injection flow rate; h is a total of f Is the on-way resistance loss of the chemical agent during the flow in the tube; h is j Is the valve local resistance loss; p is a hydraulic value detected by the pressure tester 5;
wherein the path resistance loss h of the chemical agent in the tube during the flow process f The calculation expression of (a) is:
in the formula, lambda is the pipeline friction coefficient of the conveying pipe 2; l is the length of the injection transport pipe 2; d is the inner diameter of the transport pipe 2;
valve local resistance loss h of the solenoid valve 4 j The calculation expression of (a) is:
in the formula, ζ is a valve local resistance coefficient of the electromagnetic valve 4;
step S22: the valve opening K of the solenoid valve 4 is calculated from ζ = f (K) a relationship between the valve local resistance coefficient of the solenoid valve 4 and the valve opening K.
And step S3: the controller 6 sends an opening degree control instruction to the electromagnetic valve 4 according to the calculated valve opening K of the electromagnetic valve 4;
and step S4: after the electromagnetic valve 4 is opened, the chemical agent stored in the tank body 1 is injected into the chemical agent injection joint 3 through the conveying pipe 2.
In step S4, the chemical injection power is derived from the pressure difference between the underwater pressure and the chemical injection joint 3 pressure, without the chemical injection pump. That is, it is shown that the chemical agent underwater storage and injection system realizes the injection of the chemical agent by the pressure difference between the seawater environment and the chemical agent injection joint 3, and realizes the control of the injection flow rate of the chemical agent through the electromagnetic valve 4.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (5)
1. A control method for underwater storage and injection of chemical agents adopts a chemical agent underwater storage and injection system, and the chemical agent underwater storage and injection system comprises: the chemical agent injection device comprises a tank body (1), a conveying pipe (2), a chemical agent injection joint (3), an electromagnetic valve (4), a pressure measuring instrument (5) and a controller (6), wherein the tank body (1) is arranged underwater; the chemical agent injection joint (3) is used for being butted with an underwater part of a drilling device (7), and the pressure measuring instrument (5) is used for being arranged at the butt joint of the chemical agent injection joint (3) and the drilling device (7) and monitoring the hydraulic pressure in the drilling device (7); the tank body (1) is communicated with the chemical agent injection joint (3) through the conveying pipe (2); the electromagnetic valve (4) is arranged on the conveying pipe (2); the controller (6) is arranged on water, the electromagnetic valve (4) and the pressure measuring instrument (5) are connected with the controller (6) through signal lines,
the control method is characterized by comprising the following steps:
step S1: the method comprises the steps that the relation zeta = f (K) of the valve local resistance coefficient zeta of the electromagnetic valve (4) and the valve opening K is obtained through experiments;
step S2: the controller (6) acquires a hydraulic value of the pressure measuring instrument (5) and calculates a valve local resistance coefficient zeta of the electromagnetic valve (4);
and step S3: the controller (6) sends an opening degree control instruction to the electromagnetic valve (4) according to the valve opening K of the electromagnetic valve (4) obtained through calculation;
and step S4: after the electromagnetic valve (4) is opened, the chemical agent stored in the tank body (1) is injected into the chemical agent injection joint (3) through the conveying pipe (2).
2. The method for controlling underwater storage and injection of chemical agents according to claim 1, wherein said step S2 comprises in particular the steps of:
step S21: calculating the valve local resistance coefficient of the electromagnetic valve (4), wherein the calculation expression is as follows:
in the formula: rho is the density of the seawater; g is the acceleration of gravity; h is the water depth of the chemical agent injection joint (3); delta P is the pressure difference between the seawater side of the piston (11) and the inner side of the tank; v is the chemical injection flow rate; hf is the on-way resistance loss of the chemical agent during flow in the tube; hj is the valve local resistance loss; p is a hydraulic value detected by the pressure tester (5);
wherein, the calculation expression of the path resistance loss hf of the chemical agent in the flowing process in the pipe is as follows:
wherein lambda is the pipeline friction coefficient of the conveying pipe (2); l is the length of the injection conveying pipe (2); d is the inner diameter of the conveying pipe (2);
the calculation expression of the valve local resistance loss hj of the electromagnetic valve (4) is as follows:
in the formula, zeta is the valve local resistance coefficient of the electromagnetic valve (4);
step S22: and calculating the valve opening K of the electromagnetic valve (4) according to the relationship zeta = f (K) of the valve local resistance coefficient and the valve opening K of the electromagnetic valve (4).
3. The method of controlling underwater storage and injection of chemical agents of claim 1,
the upper portion of the jar body (1) is provided with piston (11), be provided with medicament entry (10) on piston (11), the bottom of the jar body (1) is provided with the medicament export, the bottom surface of the jar body (1) disposes base (12).
4. A method of controlling underwater storage and injection of chemical agents according to claim 3, further comprising an underwater foundation (8), said base (12) being disposed on said underwater foundation (8).
5. The method of controlling underwater storage and injection of chemical agents of claim 3,
and two ends of the conveying pipe (2) are respectively butted with the agent outlet through a first underwater joint (21) and butted with the chemical agent injection joint (3) through a second underwater joint (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110521057.6A CN113107445B (en) | 2021-05-13 | 2021-05-13 | Chemical agent underwater storage and injection system and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110521057.6A CN113107445B (en) | 2021-05-13 | 2021-05-13 | Chemical agent underwater storage and injection system and control method |
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| CN113107445A CN113107445A (en) | 2021-07-13 |
| CN113107445B true CN113107445B (en) | 2023-04-07 |
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| CN113375061B (en) * | 2021-08-16 | 2021-11-16 | 海默新宸水下技术(上海)有限公司 | Medicine injection metering device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DK1529152T3 (en) * | 2002-08-14 | 2007-11-19 | Baker Hughes Inc | Undersea Injection Unit for Injection of Chemical Additives and Monitoring System for Operation of Oil Fields |
| US9309750B2 (en) * | 2014-06-26 | 2016-04-12 | Cameron International Corporation | Subsea on-site chemical injection management system |
| CN105114043B (en) * | 2015-09-18 | 2017-07-04 | 中国海洋石油总公司 | A kind of system and method for improving deep water gas field gaslift water pumping gas production recovery ratio |
| CN109339754A (en) * | 2018-12-13 | 2019-02-15 | 美钻深海能源科技研发（上海）有限公司 | Marine oil field closing well robotics injection device |
| CN110252750A (en) * | 2019-06-12 | 2019-09-20 | 海洋石油工程股份有限公司 | A kind of equipment applied to deep-sea oil gas pipeline cleaning operation |
| CN111456684A (en) * | 2020-04-03 | 2020-07-28 | 中海石油深海开发有限公司 | Chemical agent injection system and method for deepwater underwater wellhead |
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Inventor after: Li Qingping Inventor after: Liu Yongfei Inventor after: Wang Jinlong Inventor after: Qin Rui Inventor after: Zhu Junlong Inventor before: Li Qingping Inventor before: Liu Yongfei Inventor before: Wang Jinlong Inventor before: Qin Xin Inventor before: Zhu Junlong |
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