CN1470738A - Polish oil-pipe well nitrogen heat-insualting wellhole heat-transfer simulating technique - Google Patents
Polish oil-pipe well nitrogen heat-insualting wellhole heat-transfer simulating technique Download PDFInfo
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- CN1470738A CN1470738A CNA021256500A CN02125650A CN1470738A CN 1470738 A CN1470738 A CN 1470738A CN A021256500 A CNA021256500 A CN A021256500A CN 02125650 A CN02125650 A CN 02125650A CN 1470738 A CN1470738 A CN 1470738A
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Abstract
On the premise of geometric similiarity and thermodynamic similarity a heat-resistant (350 deg.C) and pressure-resistant (20 MPa) well bore model is established, and said model can be used for making well bore heat-transferring simulation, analyzing casing annulus injected medium temp. and pressure influence to well bore heat transfer, investigating well bore heat field distribution according to the result and evaluating the heat-insualting effect obtained by charging nitrogen gas into casing annular. The utilization of said technique can implement physical simulation research of well bore heat-transferring process under the different steam-injection conditions, define technical limit, feasibility, influence factors and application range related heat-insulating technology so as to raise steam utilization rate and well bore heat-insulating process level.
Description
The present invention relates to a kind of wellbore heat analogue technique that is used for heavy oil exploitation via steam injection.
The steam injection heating exploitation is the main oil production method of domestic and international heavy oil wells.At this kind mining type, improve the heavy crude heat extraction economic benefit and just must control annotate the vapour cost, yet, the at present on-the-spot instlated tubular that adopts usually adds packer thermally insulating the borehole technology and exists and show loving care for that the loss of vapour mass dryness fraction is big, steam utilization is low thereby the cost problem of higher, and, along with heat notes round and time are increased sleeve pipe well damage under the HTHP effect.For addressing the above problem, some Oilfield using are in the thermally insulating the borehole technology of annotating gasoline pipe and the direct inflated with nitrogen of sleeve pipe annular space, and have obtained implementation result preferably.But, because field condition complexity, the factor that influences effect of heat insulation is more, make the effective enforcement and the popularization of this technology be restricted, thereby need carry out analog study to the heat insulation wellbore heat situation of steam injection thermal recovery well nitrogen, understand fully influence factor and technical limits,, reduce or reduce unnecessary investment and cost of production so that instruct field conduct.
The object of the present invention is to provide and a kind ofly annotate the research of the heat insulation wellbore heat indoor physical simulation of vapour well nitrogen in order to carry out blank tubing, thus realize to the heat insulation technology of on-the-spot blank tubing notes vapour well annular space inflated with nitrogen thoroughly evaluating, determine the polish oil-pipe well nitrogen heat-insualting wellhole heat-transfer simulating technique of technical limits, scientific guidance field practice.
The present invention realizes like this.This technology is under geometric similarity, thermodynamic similarity, mechanically similar prerequisite, set up the wellbore model of 350 ℃ of heatproofs, withstand voltage 20MPa, and utilize this model to carry out the wellbore heat simulation, analyze the temperature, pressure of tubing and casing annular space injected media influence degree to wellbore heat, inquire into pit shaft temperature field distribution situation according to the result, estimate the effect of oil jacket annular pack nitrogen-gas heat-insulating.The implementation step and the main points of this technology are as follows:
1, sets up wellbore model.This model is made up of pit shaft body, adiabatic sealing system, heat-preserving constant-temperature system, heating temperature-control system and data acquisition processing system.Wellbore model should be annotated the vapour well to reality and reach following similar:
(1) geometric similarity a. model radially on the physical dimension, is annotated vapour well casing programme and size from the oil pipe center to the cement sheath outer rim by 1: 1 scale modeling, and is as shown in the table:
Numerical simulation calculation is passed through in cement sheath outer rim to the simulation of stratum size, utilizes the certain interior thermal resistance of vapour time of annotating of the thick quartz sand ring simulation of 40mm to realize; B. on the vertical physical dimension of model, based on along pit shaft direction Temperature Distribution equation, utilize notes vapour well temperature field analysis software to try to achieve vertically each layer Temperature Distribution, its result shows that the pit shaft Design of length condition drag longitudinal stability temperature field length of 1.5m reaches more than the 1.2m, competent fully research needs, so the planned well path effective length is 1.5m;
| Oil pipe, mm | Sleeve pipe, mm | Cement sheath, mm | ||
| Internal diameter | External diameter | Internal diameter | External diameter | External diameter |
| 76.0 | 88.90 | 161.7 | 177.8 | 247.8 |
(2) thermodynamics and certain mechanical similitude a. model are drawn materials and are guaranteed that thermal parameter is similar, the oil pipe center to each layer of cement sheath outer rim pipe draw materials and the cement sheath material all in full accord with the scene; The thick quartz sand of 40mm is adopted on the stratum, is equivalent to 15 days thermal resistance of steam injection, can satisfy the research needs, and on the particle diameter proportioning, the quartz sand of 20 orders, 40 orders, 60 orders, four kinds of particle diameters of 120 orders respectively accounts for 1/4th; B. adiabatic sealing system design realizes that diabatic process is similar, but adopts the joint ring of 450 ℃ of high temperature pressed sizing heatproofs, withstand voltage 35MPa, and is adiabatic mutually between the assurance tubing and casing, guarantees the sealing of tubing and casing annular space; C. insulation, constant temperature system design implementation model periphery are conducted heat similar, in the outside of quartz sand layer cyclic water jacket are installed, and utilize water bath with thermostatic control that simulated formation is heated and constant temperature; D. utilize heating temperature-control system to realize that heat supplies with, can adopt direct steam injection to heat whole well bore, also can be in oil pipe the filling conduction oil, control the pit shaft heating-up temperature jointly by electric heating tube and temp controlled meter, realize the thermodynamic similarity that heat is supplied with.
(3) vapour is aboveground states several similar primary conditions with notes except that satisfying for wellbore model, temperature-sensing system also is equipped with in its inside, the outside then is furnished with data acquisition processing system, promptly thermocouple is installed respectively at 7 different radii places of oil pipe, sleeve pipe, cement sheath outer wall and simulated formation, form vertical 5 layers, radially be divided into 7 temperature monitoring systems that are listed as, each measuring point temperature is passed through computer-automatic collection.
2, wellbore heat simulation:
(1) numerical simulation is used wellbore heat numerical simulation (comprising data input, analog computation), result of calculation at the different tests scheme, analyze the temperature, pressure of tubing and casing annular space injected media influence degree, inquire into pit shaft temperature field distribution situation according to the result to wellbore heat;
(2) the demonstration test pit shaft of monitoring by the test of model heatproof, withstand voltage properties, physical analogy radially passes the accordance that thermal temperature field and value theory calculate temperature, and can whether the checking physical model reaches technical indicator, satisfy the thing mould and study needs;
(3) physical analogy a, inject the dry saturated steam of different temperatures, certain flow rate continuously from oil pipe, tubing and casing annular space nitrogen injection is annotated the nitrogen static pressure and is equaled and the corresponding saturated vapour pressure of saturated-steam temperature, estimates different temperatures, the different total heat-transfer effect of nitrogen pressure condition well-sinking of annotating; B injects the dry saturated steam of uniform temperature, certain flow rate continuously from oil pipe, and the tubing and casing annular space injects the atmosphere of static nitrogen of different pressures, estimates same steam injecting temperature, the different nitrogen pressure condition well-sinking nitrogen-gas heat-insulating effect of annotating; C under the state that the tubing and casing annular space keep to be communicated with, injects the saturated vapour of uniform temperature continuously from oil pipe, and the tubing and casing annular space injects the nitrogen of different pressures, estimates the technical limits of nitrogen-gas heat-insulating technology.
3, utilize numerical simulation, results of Physical, thoroughly evaluating oil, casing annulus filling nitrogen-gas heat-insulating effect.
Nitrogen-gas heat-insulating wellbore heat analogue technique provided by the invention can realize the different PHYSICAL MODELING OF IN of annotating vapour operating mode well-sinking diabatic processes with gloss oil pipe well tubing and casing annular injection nitrogen-gas heat-insulating physical model of wellbore heat, effect of heat insulation to the different heat insulation technologies of oil jacket annular space carries out thoroughly evaluating, and can determine the technical limits of relevant heat-insulating technique, feasibility, the influence factor and the scope of application, thereby instruct field practice, avoid the unnecessary waste of blindly operation and nitrogen, to control viscous crude cost of production, it is significant to improve steam heat utilization rate and heat insulation technological level, is suitable for extensive use.
Fig. 1 is a blank tubing nitrogen-gas heat-insulating pit shaft physical model provided by the invention.
Fig. 2 is a nitrogen-gas heat-insulating wellbore heat physical simulation system flow chart.
Below in conjunction with accompanying drawing enforcement of the present invention is described further.
As shown in Figure 1, nitrogen-gas heat-insulating pit shaft physical model provided by the invention is made up of insulation end cap 1, support 2, shell body 3, inner housing 4, simulated formation 5, cement sheath 6, sleeve pipe 7, oil pipe 8, heat-insulating and sealing ring 9, control panel 10, temp controlled meter 11, thermocouple 12 and base 13.Wherein, the annular space between shell body 3 and the inner housing 4 constitutes cyclic water jacket.Simulated formation 5 respectively accounts for 1/4 quartz sand by thick 40mm, particle diameter proportioning 20 orders, 40 orders, 60 orders, 120 orders and constitutes.It is 7 " sleeve pipe and 3 " oil pipe of N80 that sleeve pipe 7, oil pipe 8 adopt material respectively.Control panel 10 is provided with temp controlled meter 11 and steam inlet 14, nitrogen inlet 15, nitrogen outlet 16, steam (vapor) outlet 17, vacuum orifice 18 and thermocouple signal line socket 19.Thermocouple 12 is installed in 7 different radii places in oil pipe 8, sleeve pipe 7, cement sheath 6 outer walls and the simulated formation 5 respectively, form vertical 5 layers, radially 7 row temperature monitoring systems, be connected with the holding wire of being introduced by thermocouple signal line socket 19, each measuring point temperature is by computer-automatic collection.
As shown in Figure 2, nitrogen-gas heat-insulating wellbore heat physical simulation system is the center with the wellbore model, and device such as, water source water-soluble by nitrogen cylinder, high-pressure bottle, booster pump, vacuum pump, condenser, constant temperature, high-pressure metering pump, steam generator, back-pressure valve, gatherer constitutes.
Claims (2)
1, a kind of polish oil-pipe well nitrogen heat-insualting wellhole heat-transfer simulating technique, it is characterized in that, this technology is under the prerequisite of geometric similarity, thermodynamic similarity, set up the wellbore model of 350 ℃ of heatproofs, withstand voltage 20MPa, and utilize this model to carry out the wellbore heat simulation, analyze the tubing and casing annular space and inject medium temperature, pressure influence degree, inquire into pit shaft temperature field distribution situation according to the result, the effect of evaluation oil jacket annular pack nitrogen-gas heat-insulating wellbore heat; The implementation step and the main points of this technology are as follows:
(1) set up this model of wellbore model and be made up of pit shaft body, adiabatic sealing system, heat-preserving constant-temperature system, heating temperature-control system and data acquisition processing system, wellbore model should be annotated the vapour well to reality and reach following similar:
1. geometric similarity a radially on the physical dimension, annotates vapour well casing programme from the oil pipe center to the cement sheath outer rim by 1: 1 scale modeling; The cement sheath outer rim utilizes the certain interior thermal resistance of vapour time of annotating of the thick quartz sand ring simulation of 40mm to realize to the simulation of stratum size; B, vertically on the physical dimension, the planned well path effective length is 1.5m;
2. thermodynamics and certain mechanical similitude a, from the oil pipe center to each layer of cement sheath outer rim pipe draw materials and the cement sheath material all with on-the-spot in full accord; The thick quartz sand of 40mm is adopted on the stratum, and the quartz sand of 20 orders, 40 orders, 60 orders, four kinds of particle diameters of 120 orders respectively accounts for 1/4; B, but the joint ring of 450 ℃ of employing high temperature pressed sizing heatproofs, withstand voltage 35MPa guarantees thermal insulation mutually between the tubing and casing, guarantees that the tubing and casing annular space seals; C installs cyclic water jacket in the outside of quartz sand layer, utilizes water bath with thermostatic control that simulated formation is heated and constant temperature; D utilizes heating temperature-control system to realize that heat supplies with, and adopts direct steam injection to heat whole well bore, also can be in oil pipe the filling conduction oil, control the pit shaft heating-up temperature jointly by electric heating tube and temp controlled meter;
3. temperature-sensing system is equipped with in inside, data acquisition processing system is equipped with in the outside, promptly thermocouple is housed respectively at 7 different radii places of oil pipe, sleeve pipe, cement sheath outer wall and simulated formation, form vertical 5 layers, radially be divided into 7 temperature monitoring systems that are listed as, each measuring point temperature is passed through computer-automatic collection;
(2) wellbore heat simulation
1. numerical simulation is used the wellbore heat numerical simulation, at the result of calculation of different tests scheme, analyzes the oil jacket annular space and injects medium temperature, the pressure influence degree to wellbore heat, inquires into pit shaft temperature field distribution situation according to the result;
2. the demonstration test pit shaft of monitoring by the test of model heatproof, withstand voltage properties, physical analogy radially passes the accordance that thermal temperature field and value theory calculate temperature, and can whether the checking physical model reaches technical indicator, satisfy the thing mould and study needs;
3. physical analogy a, inject the dry saturated steam of different temperatures, certain flow rate continuously from oil pipe, tubing and casing annular space nitrogen injection is annotated the nitrogen static pressure and is equaled and the corresponding saturated vapour pressure of saturated-steam temperature, estimates different temperatures, the different total heat-transfer effect of nitrogen pressure condition well-sinking of annotating; B injects the dry saturated steam of uniform temperature, certain flow rate continuously from oil pipe, and the tubing and casing annular space injects the atmosphere of static nitrogen of different pressures, estimates same steam injecting temperature, the different nitrogen pressure condition well-sinking nitrogen-gas heat-insulating effect of annotating; C, under the state that keeps being communicated with at the oil jacket annular space, from the saturated vapour of oil pipe injection uniform temperature, the tubing and casing annular space injects the nitrogen of different pressures, estimates the technical limits of nitrogen-gas heat-insulating technology;
(3) utilize numerical simulation, results of Physical, thoroughly evaluating oil jacket annular space
Filling nitrogen-gas heat-insulating effect.
2, polish oil-pipe well nitrogen heat-insualting wellhole heat-transfer simulating technique according to claim 1, it is characterized in that the wellbore model that is adopted is made up of insulation end cap (1), support (2), shell body (3), inner housing (4), simulated formation (5), cement sheath (6), sleeve pipe (7), oil pipe (8), heat-insulating and sealing ring (9), control panel (10), temp controlled meter (11), thermocouple (12) and base (13); Wherein, the annular space between inner housing (4) and the shell body (3) constitutes cyclic water jacket; Simulated formation (5) respectively accounts for 1/4 quartz sand by thick 40mm, particle diameter proportioning 20 orders, 40 orders, 60 orders, 120 orders and constitutes; Sleeve pipe (7), oil pipe (8) adopt 7 " sleeve pipe and 3 " oil pipe of material N80 respectively; Control panel (10) is provided with temp controlled meter (11) and steam inlet (14), nitrogen inlet (15), nitrogen outlet (16), steam (vapor) outlet (17), vacuum orifice (18) and thermocouple signal line socket (19); Thermocouple (12) is installed in 7 different radii places of outer oil pipe (8), sleeve pipe (7), cement sheath (6) outer wall and simulated formation (5) respectively, form vertical 5 layers, radially 7 row temperature monitoring systems, be connected with the holding wire of being introduced by thermocouple signal line socket (19), each measuring point temperature is by computer-automatic collection.
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| CN 02125650 CN1237255C (en) | 2002-07-26 | 2002-07-26 | Polish oil-pipe well nitrogen heat-insualting wellhole heat-transfer simulating technique |
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| CN 02125650 CN1237255C (en) | 2002-07-26 | 2002-07-26 | Polish oil-pipe well nitrogen heat-insualting wellhole heat-transfer simulating technique |
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| CN1470738A true CN1470738A (en) | 2004-01-28 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866983A (en) * | 2012-08-09 | 2013-01-09 | 同济大学 | Finite difference method of fine simulation tubular well structure |
| CN101725345B (en) * | 2009-11-10 | 2013-07-10 | 河北理工大学 | Device for simulating casing-cement sheath damage indoor test under stratum action |
| CN103527182A (en) * | 2013-10-28 | 2014-01-22 | 东北石油大学 | Experimental device for steam assisted gravity drainage driving vertical differentiation of heavy oil |
| CN109681148A (en) * | 2018-12-14 | 2019-04-26 | 中国石油大学(北京) | Full pit shaft attemperator and its application method |
| CN111144030A (en) * | 2020-01-03 | 2020-05-12 | 西南石油大学 | Circulating supercritical CO2Performance analysis method of coaxial heat exchanger for developing geothermal energy |
-
2002
- 2002-07-26 CN CN 02125650 patent/CN1237255C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101725345B (en) * | 2009-11-10 | 2013-07-10 | 河北理工大学 | Device for simulating casing-cement sheath damage indoor test under stratum action |
| CN102866983A (en) * | 2012-08-09 | 2013-01-09 | 同济大学 | Finite difference method of fine simulation tubular well structure |
| CN102866983B (en) * | 2012-08-09 | 2016-06-29 | 同济大学 | A kind of finite difference method of fine analog pipe well structure |
| CN103527182A (en) * | 2013-10-28 | 2014-01-22 | 东北石油大学 | Experimental device for steam assisted gravity drainage driving vertical differentiation of heavy oil |
| CN109681148A (en) * | 2018-12-14 | 2019-04-26 | 中国石油大学(北京) | Full pit shaft attemperator and its application method |
| CN109681148B (en) * | 2018-12-14 | 2020-04-24 | 中国石油大学(北京) | Whole shaft heat preservation device and using method thereof |
| CN111144030A (en) * | 2020-01-03 | 2020-05-12 | 西南石油大学 | Circulating supercritical CO2Performance analysis method of coaxial heat exchanger for developing geothermal energy |
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