CN101922595A - Anti-drag heat insulation method for oil and gas pipeline - Google Patents
Anti-drag heat insulation method for oil and gas pipeline Download PDFInfo
- Publication number
- CN101922595A CN101922595A CN 201010256156 CN201010256156A CN101922595A CN 101922595 A CN101922595 A CN 101922595A CN 201010256156 CN201010256156 CN 201010256156 CN 201010256156 A CN201010256156 A CN 201010256156A CN 101922595 A CN101922595 A CN 101922595A
- Authority
- CN
- China
- Prior art keywords
- drag
- heat insulation
- pipe
- oil
- transfer rate
- 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.)
- Granted
Links
Images
Landscapes
- Pipeline Systems (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses an anti-drag heat insulation method for oil and gas pipelines, which is used for heat insulation of the oil and gas pipelines on seabed in winter and in land cold areas. Aiming at liquid phases in the oil and gas pipelines, the method selects polymer drag reducers capable of being dissolved in the liquid phases as anti-drag insulation agents, and the polymer drag reducers are added into the liquid phases according to a use concentration to realize anti-drag insulation. The anti-drag insulation agents can transfer the turbulent heat transfer property of the pipelines to laminar flow heat transfer property, the method of the invention use a laminar flow heat transfer comparison method to measure the heat convection coefficients of the liquid phases, wherein a measurement device is an extension-type heat transfer device comprising an inner pipe and a bushing, wherein the flow in the inner pipe is turbulence, and the flow in the bushing is laminar flow. In the invention, the use concentration of the anti-drag insulation agents is determined through drawing a relation curve between the relative rate of change of convection heat transfer coefficients and the concentration of multiple added agents.
Description
Technical field:
The present invention relates to the energy-saving and cost-reducing technical field of oil gas accumulating, particularly adopt drag reduction technology that the oil and gas pipes under the turbulent flow operating mode is carried out the method for anti-drag heat insulation, be applicable to sea-bottom oil-gas conveyance conduit and the insulation of land cold area pipe-line in winter.
Background technique
The higher fluid of temperature in pipe in the flow process constantly to the low temperature environment dissipated heat, fluid temperature (F.T.) reduces gradually.Usually, for Petroleum Production and conveying pipe, the outlet temperature that oil gas is carried should be higher than 3～5 ℃ of the freezing point temperatures of oil product, perhaps is higher than 3～5 ℃ at the solidifying point of wax in the oil product, causes line clogging to prevent oil product or wax from solidifying.And the initial temperature of oil transportation should not be higher than a temperature of heating up in a steamer of oil product, in order to avoid cause the evaporating loss of oil product.These two kinds of temperature conditions have determined scope and the necessary insulation measure and the heating power energy consumption of oil transportation temperature, to guarantee the normal operation of oil and gas pipes in low temperature environment.
Overall coefficient of heat transfer between ducted fluid and environment is most important for the temperature drop of oil and gas pipes, reducing overall coefficient of heat transfer can make fluid reduce to the radiation loss of environment, therefore the temperature drop of unit duct length also reduces, to guarantee that the outlet temperature that oil gas is carried is higher than 3～5 ℃ of freezing point temperatures this moment, needed heating power expense will correspondingly reduce, and plays the effect of energy saving and fund.Thereby the thermal resistance that adopts thermal insulating material to increase heat conduction reduces overall coefficient of heat transfer, and this is the pipe insulation principle of using always.Convection transfer rate between tube fluid medium and tube wall is the constituent element of overall coefficient of heat transfer, reduces the convection transfer rate between tube fluid medium and tube wall, helps the reduction of overall coefficient of heat transfer equally, has insulation effect.
Drag reduction can suppress turbulent skn friction, can obtain inference according to the reynolds analogue theory: drag reduction will suppression fluid and tube wall between convection transfer rate.Production of hydrocarbons and conveying pipe move under the turbulent flow operating mode usually, and drag reduction can suppress convection heat exchange, this be heat exchanger tube do not wish to occur, but the oil gas conveying pipe is needed just.Anti-drag heat insulation is carried for the oil gas of submarine pipeline in winter, and the oil and gas pipes of land cold area is carried and all had double meaning: the first can reduce the flow resistance of oil gas in pipe, and it two is the insulations that help tube fluid.Usually, pipeline is carried out drag reduction not will consider insulation, the insulation of pipeline not will consider mobile drag reduction yet pipeline.
Summary of the invention
The present invention is directed to sea-bottom oil-gas conveyance conduit and land cold area pipe-line in winter, according to drag reduction technology effective this basic principle of convection heat exchange of suppression fluid and tube wall under the turbulent flow operating mode, two technical problems of drag reduction and insulation are combined, a kind of method that adopts drag reduction technology that the oil and gas pipes of turbulent flow feed status is incubated is proposed, by the heat insulation effect of drag reduction technology lifting, reach the purpose that reduces the heating power energy consumption to tube fluid.
For reaching above purpose, the present invention takes following technological scheme to be achieved:
A kind of anti-drag heat insulation method for oil and gas pipeline is characterized in that, comprises the steps:
(1) adopt the laminar heat transfer comparison method to measure convection transfer rate.Concrete grammar is managed and sleeve pipe in dividing for adopting a casing type heat exchanging device, and the Steel Type of interior pipe is identical with the Steel Type of oil and gas pipes, fluid in the interior pipe is the liquid phase in the oil and gas pipes, as high temperature heat release side, flow velocity is identical with actual ducted liquid phase flow rate, and flowing state is a turbulent flow; Fluid in the sleeve pipe is a cooling liquid, and flowing state remains laminar flow, and sleeve pipe is outer adiabatic; For fixing sleeve pipe geometrical construction, when cooling liquid wherein flow for full-blown laminar flow the time, its convection transfer rate is a fixed value, because the thermal conductivity of pipeline steel also is a definite value, overall coefficient of heat transfer K obtains according to the thermal conduction study heat balance method of, by the thermal conduction study formula
Fluid in can calculating in the pipe and the convection transfer rate h between inner tube wall
i, in the formula: λ is the thermal conductivity of pipeline steel, h
oBe the convection transfer rate between the outer wall of cooling liquid in the sleeve pipe and interior pipe, d
oBe the external diameter of interior pipe, d
iInternal diameter for interior pipe;
Liquid phase convection transfer rate when (2) adding agent concentration and be 0ppm is measured: according to step (1), record when adding agent concentration and being 0ppm in convection transfer rate h between the inwall of fluid in the pipe and interior pipe
iValue be h
I-0
(3) select the anti-drag heat insulation agent for use:, select for use the polymer drag reducer that dissolves in wherein as the anti-drag heat insulation agent at the liquid phase in the oil and gas pipes;
(4) measure a plurality of convection transfer rates that add under the agent concentration: polymer drag reducer is joined in the pipeline with a plurality of different concentration, each is added agent concentration, (1) all set by step, fluid in measuring in the pipe and the convection transfer rate h between the inner tube wall
iValue be h
I-DR
(5) calculate the anti-drag heat insulation effect: with the relative change rate HTR of interior pipe convection transfer rate as basic parameter, expression anti-drag heat insulation effect, calculating formula is:
H wherein
I-0Represent the interior pipe convection transfer rate when adding agent concentration is 0ppm, h
I-DRRepresent that each adds the value of convection transfer rate between interior pipe fluid under the agent concentration and the inner tube wall;
(6) determine the working concentration of anti-drag heat insulation agent: relative change rate HTR and a plurality of relation curve that adds agent concentration of pipe convection transfer rate in drawing, on this curve, choose a working concentration that adds agent concentration as the anti-drag heat insulation agent;
(7) carry out anti-drag heat insulation: selected anti-drag heat insulation agent is added among the liquid phase of oil and gas pipes to use concentration, realized anti-drag heat insulation.
The advantage of the inventive method is: two technical problems of drag reduction and insulation are combined, a kind of method of oil and gas pipes anti-drag heat insulation is proposed, a kind of heat preservation technology as oil and gas pipes, the oil gas of submarine pipeline is carried for winter, and the oil gas of land cold area is carried, by drag reduction tube fluid is incubated, both can realizes drag-reduction energy-saving, can realize heat preservation energy-saving again.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the related sleeve pipe heat-exchanger rig structural drawing of laminar heat transfer comparison method of the present invention.Among the figure: 1, thermal resistor; 2, cooling liquid; 3, fluid in the pipe; 4, heat insulation layer; 5, interior pipe; 6, sleeve pipe; 7, cooling fluid inlet; 8, cooling fluid outlet.
Relative change rate HTR and a plurality of relation curve that adds agent concentration of pipe convection transfer rate in Fig. 2.
The agent of Fig. 3 anti-drag heat insulation is added the anti-drag heat insulation effect when different gas are fast in the oil and gas pipes that liquid phase flow rate is 1.05m/s to 300ppm concentration.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
In the present embodiment, pipe-line is one section API-X52 line pipe, internal diameter 40mm, external diameter 48mm.Liquid phase in this segment pipe horizontal arrangement, pipeline is an oil water mixture, and flow velocity is 1m/s, and oil content is 25%, and the fluid temperature (F.T.) in the moisture content 75%, pipeline is 40 ℃, changes in the scope of gas flow rate 1.6m/s～5.0m/s.
Anti-drag heat insulation method for oil and gas pipeline comprises the steps:
(1) the turbulent heat transfer characteristic of pipe changed to the laminar heat transfer characteristic in the anti-drag heat insulation agent made, adopt the convection transfer rate when laminar heat transfer comparison method mensuration is different to add agent concentration: adopt casing type heat exchanging measurement device convection transfer rate as shown in Figure 1, the interior pipe 5 of casing type heat exchanging device is the API-X52 line pipe, inner tube diameter d
i=40mm, interior external diameter of pipe d
o=48mm.Fluid 3 in the interior pipe is for oil content is 25%, the mixing material of moisture content 75%, and as high temperature heat release side, flowing state is a turbulent flow; Cooling liquid 2 in the sleeve pipe 6 is a water, and casing inner diameter D=60mm, water flow velocity therein is 0.1m/s, flowing state is a laminar flow, and the temperature of cooling liquid import 7 is 21 ℃ in the sleeve pipe, and the temperature of outlet 8 is 27 ℃, temperature is measured by thermal resistor 1, sleeve pipe outer adiabatic (heat insulation layer 4).
The thermal conductivity of used API-X52 pipeline steel is 45.3W/m, and overall coefficient of heat transfer K is measured by heat balance method of, by the thermal conduction study formula
Convection transfer rate h between the fluid in can calculating in the pipe 5 and the inwall of interior pipe
i, in the formula, λ is the thermal conductivity of pipeline steel, h
oBe the convection transfer rate between the outer wall of cooling liquid in the sleeve pipe 62 and interior pipe.
Liquid phase convection transfer rate when (2) adding agent concentration and be 0ppm is measured: when adding agent concentration and being 0ppm, and according to step (1), after measured, h
oSize is 450W/ (m
2℃), overall coefficient of heat transfer K is 282.3W/ (m
2℃), in calculating by the thermal conduction study formula pipe in 5 fluid 3 and the value h of the convection transfer rate between inner tube wall
I-0Be 890W/ (m
2℃).
(3) select the anti-drag heat insulation agent for use: the liquid phase in the oil and gas pipes is that oil content is 25%, the mixing material of moisture content 75%, and moisture content is big, and selecting main component for use is that the friction-reducing additive of polyacrylamide is as the anti-drag heat insulation agent.
(4) measure a plurality of liquid phase convection transfer rates that add under the agent concentration: polymer drag reducer is joined respectively in the pipeline with concentration 200ppm, 300ppm, 400ppm, repeating step (1), after measured, the convection transfer rate h between the outer wall of cooling liquid 2 and interior pipe 5
oThese several concentration are all remained 450W/ (m
2℃), overall coefficient of heat transfer K is then added the influence of agent concentration, and K is 167.2W/ (m when adding agent concentration and being 200ppm
2℃), K is 129.2W/ (m when adding agent concentration and being 300ppm
2℃), K is 121.3W/ (m when adding agent concentration and being 400ppm
2℃).Calculate the value h of liquid phase convection transfer rate when adding agent concentration and being 200ppm by the thermal conduction study formula
I-DRBe 280.4W/ (m
2℃), the value h of liquid phase convection transfer rate when adding agent concentration and being 300ppm
I-DRBe 187.8W/ (m
2℃), the value h of liquid phase convection transfer rate when adding agent concentration and being 400ppm
I-DRBe 171.7W/ (m
2℃).
(5) calculate the anti-drag heat insulation effect: with the relative change rate HTR of interior pipe convection transfer rate as the anti-drag heat insulation rate, expression anti-drag heat insulation effect, calculating formula is:
H wherein
I-0Represent the interior pipe convection transfer rate when adding agent concentration is 0ppm, h
I-DRInterior pipe convection transfer rate when expression adds agent concentration greater than 0ppm.
(6) determine the working concentration of anti-drag heat insulation agent: relative change rate HTR and a plurality of relation curve that adds agent concentration of pipe convection transfer rate are seen Fig. 2 in drawing.According to this curve, it is about 10% that the anti-drag heat insulation rate of the anti-drag heat insulation rate when adding agent concentration and being 300ppm during than 200ppm increases, and the anti-drag heat insulation rate is then approaching during with 400ppm, can choose 300ppm and add the working concentration of agent concentration as the anti-drag heat insulation agent.
(7) carry out anti-drag heat insulation: selected anti-drag heat insulation agent is added in the oil and gas pipes that liquid phase flow rate is 1.05m/s with 300ppm concentration, realized anti-drag heat insulation, when different gas are fast, see Fig. 3 by the heat insulation effect that heat balance method of is measured.Can know that by Fig. 3 gas flow rate is in 1.6m/s～5.0m/s scope, for different gas flow rates, the anti-drag heat insulation rate is all up to about 80%, this show use the anti-drag heat insulation agent after, it is about 80% that fluid in the oil and gas pipes and the convection transfer rate between tube wall have reduced, and has tangible heat insulation effect.
Claims (1)
1. an anti-drag heat insulation method for oil and gas pipeline is characterized in that, comprises the steps:
(1) adopt a casing type heat exchanging device, pipe and sleeve pipe in dividing, the Steel Type of interior pipe is identical with the Steel Type of oil and gas pipes, fluid in the interior pipe is the liquid phase in the oil and gas pipes, as high temperature heat release side, flow velocity is identical with actual ducted liquid phase flow rate, and flowing state is a turbulent flow; Fluid in the sleeve pipe is a cooling liquid, and flowing state remains laminar flow, and sleeve pipe is outer adiabatic; For fixing sleeve pipe geometrical construction, when cooling liquid wherein flow for full-blown laminar flow the time, its convection transfer rate is a fixed value, because the thermal conductivity of pipeline steel also is a definite value, overall coefficient of heat transfer K obtains according to the thermal conduction study heat balance method of, by the thermal conduction study formula
Fluid in can calculating in the pipe and the convection transfer rate h between inner tube wall
i, in the formula: λ is the thermal conductivity of pipeline steel, h
oBe the convection transfer rate between the outer wall of cooling liquid in the sleeve pipe and interior pipe, d
oBe the external diameter of interior pipe, d
iInternal diameter for interior pipe;
Liquid phase convection transfer rate when (2) adding agent concentration and be 0ppm is measured: the convection transfer rate h between the fluid in calculating when adding agent concentration and being 0ppm according to the formula of step (1) in the pipe and the inwall of interior pipe
iValue be h
I-0
(3) select the anti-drag heat insulation agent for use:, select for use the polymer drag reducer that dissolves in wherein as the anti-drag heat insulation agent at the liquid phase in the oil and gas pipes;
(4) measure a plurality of convection transfer rates that add under the agent concentration: the anti-drag heat insulation agent is joined in the pipeline with a plurality of different concentration, each is added agent concentration, (1) all set by step, fluid in measuring in the pipe and the convection transfer rate h between the inner tube wall
iValue be h
I-DR
(5) calculate the anti-drag heat insulation effect: with the relative change rate HTR of interior pipe convection transfer rate as basic parameter, expression anti-drag heat insulation effect, calculating formula is:
H wherein
I-0Represent the interior pipe convection transfer rate when adding agent concentration is 0ppm, h
I-DRRepresent that each adds the value of convection transfer rate between interior pipe fluid under the agent concentration and the inner tube wall;
(6) determine the working concentration of anti-drag heat insulation agent: relative change rate HTR and a plurality of relation curve that adds agent concentration of pipe convection transfer rate in drawing, on this curve, choose a working concentration that adds agent concentration as the anti-drag heat insulation agent;
(7) carry out anti-drag heat insulation: selected anti-drag heat insulation agent is added among the liquid phase of oil and gas pipes to use concentration, realized anti-drag heat insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102561568A CN101922595B (en) | 2010-08-18 | 2010-08-18 | Anti-drag heat insulation method for oil and gas pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102561568A CN101922595B (en) | 2010-08-18 | 2010-08-18 | Anti-drag heat insulation method for oil and gas pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101922595A true CN101922595A (en) | 2010-12-22 |
| CN101922595B CN101922595B (en) | 2012-11-28 |
Family
ID=43337698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102561568A Expired - Fee Related CN101922595B (en) | 2010-08-18 | 2010-08-18 | Anti-drag heat insulation method for oil and gas pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101922595B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168785A (en) * | 2011-04-19 | 2011-08-31 | 河海大学 | Heat-insulation pipeline used for transport process of constant temperature liquid pipeline |
| CN103450870A (en) * | 2013-08-22 | 2013-12-18 | 中国石油集团渤海钻探工程有限公司 | Drag reducer for fracturing of unconventional oil and gas reservoirs |
| CN106247031A (en) * | 2016-07-29 | 2016-12-21 | 朱贺鹏 | Metal plastic composite pipe, manufacture method and industrial steam generation induction system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2303230Y (en) * | 1997-02-04 | 1999-01-06 | 南通石墨设备设计研究所 | Intensive heat conducting sleeve type cooling pipeline for high temp. gas burner having universal expansion joint |
-
2010
- 2010-08-18 CN CN2010102561568A patent/CN101922595B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2303230Y (en) * | 1997-02-04 | 1999-01-06 | 南通石墨设备设计研究所 | Intensive heat conducting sleeve type cooling pipeline for high temp. gas burner having universal expansion joint |
Non-Patent Citations (2)
| Title |
|---|
| 《Flow, Turbulence and Combustion》 20011231 P.K. Ptasinski等 Experiments in Turbulent Pipe Flow with Polymer Additives at Maximum Drag Reduction 159-182 1 第66卷, 第2期 2 * |
| 《天然气与石油》 20100430 罗旗荣等 减阻剂减阻效果的评价与分析 8-11 1 第28卷, 第2期 2 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168785A (en) * | 2011-04-19 | 2011-08-31 | 河海大学 | Heat-insulation pipeline used for transport process of constant temperature liquid pipeline |
| CN102168785B (en) * | 2011-04-19 | 2013-05-08 | 河海大学 | Heat-insulation pipeline used for transport process of constant temperature liquid pipeline |
| CN103450870A (en) * | 2013-08-22 | 2013-12-18 | 中国石油集团渤海钻探工程有限公司 | Drag reducer for fracturing of unconventional oil and gas reservoirs |
| CN106247031A (en) * | 2016-07-29 | 2016-12-21 | 朱贺鹏 | Metal plastic composite pipe, manufacture method and industrial steam generation induction system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101922595B (en) | 2012-11-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Shahsavani et al. | Using experimental data to estimate the heat transfer and pressure drop of non-Newtonian nanofluid flow through a circular tube: applicable for use in heat exchangers | |
| Xu et al. | Numerical simulation of a buried hot crude oil pipeline during shutdown | |
| Abdel-Aziz et al. | Study of the rate of liquid–solid mass transfer controlled processes in helical tubes under turbulent flow conditions | |
| CN101922595B (en) | Anti-drag heat insulation method for oil and gas pipeline | |
| Ma et al. | Pressure drops and loss coefficients of a phase change material slurry in pipe fittings | |
| Kumar et al. | A review on triple tube heat exchangers | |
| Liu et al. | Evaluation of the energy storage performance of PCM nano-emulsion in a small tubular heat exchanger | |
| Sun et al. | Experimental and theoretical study on wax deposition and the application on a heat insulated crude oil pipeline in Northeast China | |
| CN110674572B (en) | Method for predicting natural gas hydrate generation area in seabed gas transmission pipeline | |
| Thant et al. | Mitigating flow assurance challenges in deepwater fields using active heating methods | |
| Dong et al. | Numerical study on the thermal characteristics and its influence factors of crude oil pipeline after restart | |
| Liu et al. | Study of deposition behavior in small-diameter gathering pipelines for water-cut oil | |
| Ma et al. | Influence of crystal layer on the flow and heat transfer characteristics during TBAB CHS generation in a double-tube heat exchanger | |
| CN2913791Y (en) | Electromagnetic heating tube for crude oil gathering pipeline | |
| CN101634219B (en) | Electromagnetic heating device for oil well | |
| Zhao et al. | Effect of specific heat capacity on the thermal characteristics of waxy crude oil pipeline during its shutdown | |
| CN203190853U (en) | Heat exchanger | |
| Parfentieva et al. | Solving the problem of pipeline freezing with respect to external heat exchange | |
| Quan et al. | Prediction the variation range of wax deposition with temperature of crude oil in a flow loop | |
| CN206352704U (en) | A kind of petroleum transportation pipeline attemperator | |
| Liu et al. | Analysis of transmission characteristics of steam long-distance heating pipeline | |
| Chen et al. | Wax deposition model of heavy oil in pipeline transportation | |
| CN103969156A (en) | Method for predicting the maximum pipeline section length of flowing-through of pressurized crude oil | |
| CN206440643U (en) | The continuous running temperature experimental rig of prefabricated direct-buried thermal insulation pipe | |
| CN204944262U (en) | Drum type brake phase-change material control energy cellular construction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121128 Termination date: 20150818 |
|
| EXPY | Termination of patent right or utility model |