CN105443095B

CN105443095B - A kind of single channel reservoir model of heavy crude heat extraction well to be onstructed and application

Info

Publication number: CN105443095B
Application number: CN201410374643.2A
Authority: CN
Inventors: 赵梦云; 苏建政; 张汝生; 张锁兵; 龙秋莲; 张大年; 郑承纲; 马玉生; 刘松
Original assignee: China Petroleum and Chemical Corp; Sinopec Exploration and Production Research Institute
Current assignee: China Petroleum and Chemical Corp; Sinopec Exploration and Production Research Institute
Priority date: 2014-07-31
Filing date: 2014-07-31
Publication date: 2018-04-10
Anticipated expiration: 2034-07-31
Also published as: CN105443095A

Abstract

The present invention relates to a kind of single channel reservoir model of heavy crude heat extraction well to be onstructed, the model uses reservoir sand, crude oil and the stratum water of well output to be onstructed, or simulated formation sand, Simulation of Crude Oil and simulated formation water to be fabricated to the filling channel for covering high, medium and low three permeability ranges, being completely filled with various degree by profit.The model can be used for accurately simulating the simulated tests such as the live injection of heavy oil thermal recovery fleeing proof plug water construction well progress blocking agent, solidification and plugging effect, thus thick oil thermal extraction envelope is carried out to alter water blockoff simulation test, adjust to optimize blocking agent performance and measure heavy oil wells envelope and alter water blockoff site operation control data, to instruct envelope to alter the establishment of plug water construction design, success rate and effect of increasing production that envelope alters plug water construction are improved.The physical model of the present invention and its corresponding test method are applied to instruct thick oil thermal extraction selectively envelope to alter water blockoff site operation and will produce huge economic and social profit, application prospect is very wide.

Description

A kind of single channel reservoir model of heavy crude heat extraction well to be onstructed and application

Technical field

The invention belongs to technical field of petroleum extraction, it is related to a kind of single channel reservoir physics mould of heavy crude heat extraction well to be onstructed Type and its analogue experiment method and application, in particular to it is a kind of water-plugging technique altered by envelope carry out heavy crude heat extraction wait to apply The single channel reservoir model and its analogue experiment method of work well and application.

Background technology

Currently, the structure of world oil supply is constantly changing.Heavy oil production proportion in domestic crude output Rise year by year.For viscous crude because viscosity is big, exploitation is difficult, all uses Simulation on whole pay zones mode substantially, compared with ordinary crude oils are developed, tool There are the problems such as high energy consumption, injection steamchanneling, oil well High water cut.With going deep into for Development of Viscous Crude Oil, sinopec Shengli Oil Field, The viscous crude such as Henan Oil Field main force producing region has been enter into the tail period stage, in the prevalence of serious steam fingering, onlap and well Between channeling the problems such as.Simultaneously as channeling has linked up oil well and edge-bottom water layer, thick oil thermal extraction is often producing several cycles Afterwards, production fluid is aqueous rises to more than 80%.Therefore, the channeling in heavy crude heat extraction exploitation, water breakthrough problem make well yield big Width declines, the increase of production fluid intractability, largely reduces the recovery ratio and economic benefit of heavy crude heat extraction exploitation.

The oil production method that heavy crude heat extraction development scheme is foundation viscous crude viscosity-temperature characteristic and is grown up.Generally, viscous crude is glutinous There is non-linear relation in degree, i.e. the viscosity of viscous crude will be greatly lowered in temperature rise with temperature.Simulation on whole pay zones mode is exactly to oil A large amount of high temperature and high pressure steams are injected in Tibetan, using the characteristics of steam heat capacity ratio is high, heat energy carrying capacity is strong, by the temperature of part reservoir Degree is heated to the scope that Viscosity of Heavy Crude Oil can be enable to be reduced to the conventional mechanical artificial lifting way normal work such as oil pumper, screw pump.Mesh Heavy oil block in the range of former world, more than 90% all uses Simulation on whole pay zones.

Heavy crude heat extraction development scheme can be divided into two major classes, i.e. steam drive and steam soak.It is by oil well that steam, which drives mode, Steam injection well and producing well are divided into, steam injection well injects high temperature and high pressure steam incessantly, and producing well recovers the oil incessantly.Steam gulps down The mode of telling is that high temperature and high pressure steam is first injected into heavy oil wells, after injecting certain amount, several days of closing well, then the tripping in machinery into well Pump is recovered the oil.

In steam-drive process, due to by unfavorable factors such as thick oil reservoir is heterogeneous, the high mobility ratios of steam and viscous crude Influence, steam overlap and steam fingering often occur in oil reservoir, and then cause channeling phenomenon occurs between well and well.Channeling makes It is uneven to obtain the vertical upper gas entry profile of oil reservoir, the uneven propulsion of steam in plane, the swept volume of steam is diminished, it is thick so as to reduce Oily thermal recovery recovery ratio and increase energy consumption.To block channeling, generally high temperature resistant chemical plugging agent is injected in reservoir at present, such as various nothings Machine blocking agent, organic blocking agent, foam blocking agent etc., solidify by blocking agent, precipitate or the effects such as foam is viscous are sealed to channeling It is stifled.

Another problem of puzzlement heavy crude heat extraction exploitation is exactly the water breakthrough problem of stratum water.Because Viscosity of Heavy Crude Oil is very high, lead to In the case of often, the viscous crude in heavy crude reservoir is in relative static conditions.After high temperature and high pressure steam is injected to reservoir, Viscosity of Heavy Crude Oil Decline and start to flow.Due to channeling, situations such as fingering, channelling occur in heavy crude reservoir for steam, when steamchanneling enters side After bottom aquifer, stratum water will enter producing well, reduce well temperature, increase Viscosity of Heavy Crude Oil, flow difficulties.Therefore, viscous crude Thermal production well after being immersed by stratum water, often occur yield decline to a great extent, Produced Liquid aqueous rapid situations such as rising, it is not long Oil well will be stopped production due to High water cut or water logging in time.

Channeling, edge-bottom water for thick oil thermal extraction, which are altered, to be carried out envelope and alters water blockoff, is to improve the harvesting of viscous crude resource Simulation on whole pay zones The effective means of rate and development benefit, and the vital task of viscous crude field exploitation at present.Cost-effectively envelope alters water blockoff, steady While determining heavy crude heat extraction yield, the thermal efficiency, reduction ton oil energy consumption and reduction production that steam soak and steam drive can be improved Go out the water process expense of liquid, keep stable yields and economic development to have important practical significance heavy crude reservoir.

Water blockoff field is altered in thick oil thermal extraction envelope, prior art is come to steam, stratum water using high temperature resistant chemical plugging agent Fluid-channeling channel blocked.Such as pay it is quick it is outstanding (development of heat resist modification phenolic resin composite plugging agent system and performance evaluation, Speciality Petrochemicals is in progress, Vol.14,2013 (3)：The partial cross-linked induration of chemical gel 8-10) is used into phenolic resin bag Wrap up in, a kind of high temperature resistant, the organo-mineral complexing particle blocking agent of high intensity is made, for heavy oil thermal recovery fleeing proof water blockoff.Longhua etc. (development and application of GH- high temp profile control agents, special reservoirs, Vol.9,2002 (5)：88-90) develop PF resins and inorganic The compound high temperature resistant blocking agent of thing, for gelling temperature between 50-120 DEG C, gelation time is adjustable in 8-72h, and the system is in steam injection Under washing away, sealing ratiod still reaches more than 90%, there is good resistance to elevated temperatures and sealing characteristics.Zhao, which repaiies, waits very much (heavy crude heat extraction tune Stifled architectural study Overview of Progress, special reservoirs, Vol.20,2013 (4)：1-5) combine Chinese HEAVY OIL RESERVOIR feature and note Steam production practice condition, describe the mechanism of action of conventional heavy crude heat extraction plugging agent, progress and using present situation, review 5 kinds of polymer gel, solid phase particles blocking agent, foam, w/o type emulsion and salt precipitating heavy crude heat extractions adjust stifled system, it is indicated that viscous crude The development trend of the profile control and water plugging of thermal recovery is synthesis low cost, the chemical agent of high temperature tolerance, develop it is compound adjust stifled system and Study new Low Damage environment-friendly type plugging technology.

Chinese patent CN1594827A discloses a kind of heavy oil wells closure water layer, heavy oil wells of suggestions for improvement of being used for and blocked up Water conservancy project process, the selective shut-off of large radius is carried out to oil reservoir using degradable organic blocking agent, then utilizes high temperature resistant inorganic Blocking agent is sealed, and different blocking agents are injected using different pressures, and selective blocking is realized by the degraded of Stress control and organic matter Water.

Chinese patent CN101824979B discloses a kind of emulsion process profile control and water shutoff method of thickened oil steam-stimulated well, using anti- High temperature water-in-oil emulsifier injects before steam injection or injects steam-stimulated well with steam in advance, thick using remnants in water layer There is the emulsion of oil high viscosity characteristic water layer is blocked.

Water blockoff field is altered in thick oil thermal extraction envelope, prior art focuses mainly on developing high temperature resistant blocking agent.Water blockoff is altered in envelope Research is less in terms of construction method, and relevant report is also less.Because the development scheme of thick oil thermal extraction is special, its envelope is altered water blockoff and applied Work method should be different from the shutoff method of conventional oil field.Water blockoff field is altered to detail design technology for current thick oil thermal extraction envelope Demand and prior art limitation, research establish the special envelope of thick oil thermal extraction and alter shutoff method, alter water blockoff for improving envelope and apply Work success rate, construction cost is reduced, lift the yield after oil well plugging and the stable yields cycle is all particularly significant.

The content of the invention

The technical problems to be solved by the invention are in view of the shortcomings of the prior art, there is provided a kind of heavy crude heat extraction is to be onstructed The single channel reservoir model of well, the model use reservoir sand, crude oil and the stratum water of well output to be onstructed, or simulated formation Sand, Simulation of Crude Oil and simulated formation water are fabricated to high, medium and low three permeability ranges of covering, filled completely by profit in various degree Full filling channel, the model can be used for accurately simulating live heavy oil thermal recovery fleeing proof water blockoff well progress blocking agent to be onstructed The simulated tests such as injection, solidification and plugging effect.

Present invention also offers a kind of analogue experiment method that blocking agent injection is carried out to above-mentioned reservoir model, this method The test of water blockoff Simulation evaluation, regulation optimization blocking agent are altered to carry out envelope to heavy crude heat extraction well to be onstructed using above-mentioned reservoir model Performance alters water blockoff site operation control data with heavy oil wells envelope is measured, to instruct envelope to alter the establishment of plug water construction design.

Present invention also offers a kind of heavy oil thermal recovery fleeing proof water-blocking construction method, this method utilizes above-mentioned analogue experiment method Design technology parameter and related blocking agent performance parameter when the experimental process parameters obtained are to ask for construction, these parameters can For instructing the establishment of thick oil thermal extraction closure channeling and water breakthrough detail design, success rate and increasing that envelope alters plug water construction are improved Produce effect.

Invention further provides above-mentioned heavy oil thermal recovery fleeing proof water-blocking construction method heavy crude heat extraction selectively envelope alter it is stifled Application in water site operation.

Therefore, first aspect present invention provides a kind of single channel reservoir model of heavy crude heat extraction well to be onstructed, its Including three filling channels being arranged in parallel, the filling channel is made up of the filler loaded in passage and passage, institute Stating filler includes reservoir sand, crude oil and stratum water or simulated formation sand, Simulation of Crude Oil and simulated formation water；

Three filling channels are respectively：High permeability filling channel, middle permeability filling channel and low-permeability filling are logical Road, wherein,

High permeability filling channel：Water surveys the 100%-150% that permeability is well reservoir maximum permeability to be onstructed, wherein Fluid 100% be stratum water or simulated formation water.

Middle permeability filling channel：Water surveys the 80%-99% that permeability is well reservoir maximum permeability to be onstructed, therein 40%-60% is stratum water or simulated formation water in fluid, and 40%-60% is crude oil or Simulation of Crude Oil.

Low-permeability filling channel：Water surveys the 50%-79% that permeability is well reservoir minimum permeability to be onstructed, therein Fluid 100% is crude oil or Simulation of Crude Oil.

In some embodiments of the invention, the water of high permeability filling channel and middle permeability filling channel surveys permeability Span according to the steam of well to be onstructed inject periodicity chosen, wherein,

The water of high permeability filling channel surveys permeability：

When it is 1-2 rounds to inject the cycle, 100%-110% is chosen；

When it is 3-5 rounds to inject the cycle, 111%-130% is chosen；

When injecting cycle >=6 round, 131%-150% is chosen.

The water of middle permeability filling channel surveys permeability：

When it is 4-6 rounds to inject the cycle, 80%-90% is chosen；

When injecting cycle >=7 round, 91%-99% is chosen.

In other embodiments of the present invention, after filling channel tests permeability, according to the extraction journey of well to be onstructed Degree is chosen different fluid centering permeability filling channel and filled, so that the interstitial space in middle permeability filling channel is complete It is full of, wherein,

When recovery percent of reserves is more than 15%, 50%-60% is stratum water or simulated formation water in fluid therein.

When recovery percent of reserves is less than 15%, 50-60% is crude oil or Simulation of Crude Oil in fluid therein.

When heavy oil wells recovery percent of reserves to be onstructed is high, oil content declines in reservoir, therefore the physical model of the present invention Oil content in hole also changes.

In the present invention, the reservoir model is using reservoir sand, crude oil and the stratum water of construction well output, or simulation It is high, medium and low three permeability ranges of covering made of reservoir sand, Simulation of Crude Oil and simulated formation water, complete by profit in various degree The filling channel being full of entirely.

In certain embodiments of the present invention, the radial section of the passage is polygon, circle or ellipse.Form The material of the passage exterior contour includes metal, high polymer material or hydraulicity inorganic coagulation material.

In the present invention, the metal includes but is not limited to ordinary carbon steel, 304 stainless steels, various steel alloys, cast iron, copper, aluminium Deng；The high polymer material includes but is not limited to polyolefin, polyurethane and polyamide etc., wherein polyolefin, such as can be high Molecular weight polyethylene；The hydraulic inorganic coagulation material includes but is not limited to portland cement, aluminate cement, aluminium sulfate water Mud and ferrous aluminate cement etc..

Heretofore described term " inorganic coagulation material " is also known as " mineral binder materials " and refers to that itself passes through a series of things Reason, chemical action, or can be become together with after the mixing of other materials (such as water) by a series of physical, chemical action by oar body Into hard solid, and can by loose material (such as sand, stone etc.) or block, flaky material (such as brick, stone etc.) it is cementing it is integral Material.Air hardening cementitious materials can only harden in atmosphere, and can only in atmosphere keep or develop its intensity, as gypsum, Lime etc..And hydraulic cementing materials in atmosphere, and can not only then be hardened preferably in water, keep and to develop its strong Degree, such as portland cement.

In some embodiments of the invention, the section of the passage is circle, and the length of the passage is 200.0- 1000.0mm internal diameter 20.0-200.0mm.The tubing for forming the passage exterior contour is straight tube.

According to the reservoir model of the heavy oil thermal recovery fleeing proof water blockoff well to be onstructed of the present invention, it is respectively provided with high, medium and low Three permeability paths, and its permeability, profit filling extent can be fitted according to oil well production dynamic, by using one The combination filling channel of individual Parameter adjustable simulates the reservoir in heavy crude reservoir near some individual well.Therefore, the reservoir physics mould Type is applicable to the heavy crude reservoir of different permeability grades, different heterogeneity and Production development.

Second aspect of the present invention provides a kind of reservoir model described to the first aspect of the present invention and carries out blocking agent note The analogue experiment method entered, it includes：

Step A, blocking agent is injected in three filling channels；

Step B, judge to inject the middle part of permeability filling channel during whether blocking agent leading edge reaches, and in blocking agent leading edge not In arrival during the middle part of permeability filling channel, adjustment blocking agent experiment apparent viscosity and blocking agent experiment injection rate so that stifled When the agent experiment amount of being actually implanted into is equal to blocking agent empirical theory injection rate, during injection blocking agent leading edge reaches in permeability filling channel Portion；

Step C, records experimental process parameters, and the experimental process parameters include blocking agent experiment apparent viscosity, blocking agent experiment Injection rate, the initial injection pressure of blocking agent experiment, blocking agent experiment flowing pressure gradient, blocking agent experiment closure pressure and experiment viscous crude Mutually start pressure；

In stepb, keep the blocking agent experiment amount of being actually implanted into constant.

The blocking agent experiment amount of being actually implanted into is permeability filling channel hole in high permeability filling channel pore volume and 50% Gap volume sum.

The blocking agent empirical theory injection rate is logical for the aqueous phase volume in high permeability filling channel and the filling of middle permeability The 45%-55% sums (or summation of the fluid volume gone out by displacement) of oil phase and/or aqueous phase volume in road.

Refer to the leading edge edge injection for injecting blocking agent during blocking agent leading edge of the present invention reaches in the middle part of permeability filling channel During direction reaches in the range of ± the 5cm in permeability filling channel physical midpoint section, the leading edge of preferably blocking agent arrives along injection direction Up in the range of ± the 3cm in middle permeability filling channel physical midpoint section.It is more highly preferred to, the leading edge of blocking agent arrives along injection direction Up in the range of ± the 1cm in middle permeability filling channel physical midpoint section.It is even more preferable, the leading edge edge injection side of blocking agent The physical midpoint section of permeability filling channel into arrival.

According to the present invention, in stepb, the liquid outlet quantity of the central permeability filling channel port of export is filled out equivalent to middle permeability When filling the 45%-55% of passage total pore size volume, then it is judged as injecting during blocking agent leading edge has reached in permeability filling channel Portion.

In some embodiments of the invention, in stepb, blocking agent experiment apparent viscosity and blocking agent experiment injection speed are adjusted Degree, make blocking agent experiment injection pressure reach blocking agent experiment closure pressure value when, at least 60v%-80v% blocking agent is injected into height Among permeability filling channel.

In some embodiments of the invention, blocking agent simulated injection experiment is being carried out using the reservoir model of the present invention During, regulation is optimized to the rheological property of blocking agent first, its adjusting method is：According to the flowing of blocking agent in simulated test State, the rheological property (mainly adjusting blocking agent experiment apparent viscosity) of blocking agent is adjusted, is reaching blocking agent experiment injection pressure During blocking agent experiment closure pressure value, have to account for total injection rate 70% and all enter high permeability with the injection blocking agent of upper volume and filled out Fill among passage.Record now blocking agent experiment charge velocity, blocking agent experiment apparent viscosity and blocking agent experiment injection pressure, this viscosity Value is exactly the detail design apparent viscosity value for needing to reach when blocking agent is prepared in site operation；This blocking agent experiment charge velocity is (single Position the time in injection blocking agent total volume fraction) after conversion be site operation in blocking agent detail design injection rate； This blocking agent experiment injection pressure is the detail design injection upper limit of pressure value of blocking agent in site operation.

In other embodiments of the present invention, it is necessary to read in the simulated test of blocking agent injection reservoir model Data below is recorded as experimental process parameters, for estimating construction technology in heavy oil thermal recovery fleeing proof plug water construction scheme is designed Parameter.

Blocking agent tests injection rate：Maximum volume during filling channel in parallel is injected in the blocking agent unit interval.

The initial injection pressure of blocking agent experiment：Blocking agent injects most low injection pressure during high permeability filling channel.

Blocking agent tests flowing pressure gradient：Blocking agent it is lasting injection high permeability filling channel during, pressure it is upper Rise gradient.

Blocking agent experiment closure pressure：Maximum injection pressure during blocking agent reaches during permeability filling channel middle part.

Experiment viscous crude mutually starts pressure：In simulated test, blocking agent enters maximum injection during low-permeability filling channel Pressure.

Third aspect of the present invention provides a kind of heavy oil thermal recovery fleeing proof water-blocking construction method, its detail design technological parameter The experimental process parameters that analogue experiment method according to above-mentioned second aspect is obtained, which calculate, to be obtained, wherein,

Blocking agent detail design apparent viscosity is equal to blocking agent experiment apparent viscosity；

Detail design maximum pressure is equal to experiment viscous crude and mutually starts pressure；

Blocking agent detail design injection rate is calculated according to formula (I)：

Blocking agent detail design injection rate=η × blocking agent experiment injection rate (I)

In formula (I),

The unit of blocking agent detail design injection rate is L/min；

The unit of blocking agent experiment injection rate is ml/min；

η is the conversion coefficient between blocking agent experiment injection rate and blocking agent detail design injection rate, according to formula (II) Calculated：

η span is 1.0 × 10⁵-15.0×10⁵；

The blocking agent detail design normal temperature cure time is 1-10 times of blocking agent detail design injection length, and the blocking agent construction is set Meter injection length is calculated according to formula (III)：

According to the present invention, the blocking agent detail design injection rate is equal to high seepage channel volume, the high seepage channel body Product is calculated according to formula (IV)：

In formula (IV)：

Vx：High seepage channel volume, m³；

M_oil：Oil well cumulative oil production, m³；

L：Straight well is core intersection, and horizontal well is oil reservoir horizontal section length, m；

π：3.14；

r_heat：Only rely on heat exchange pattern, inject the covering radius of steam fuel factor, m；

r_heatThe average pore of covered pit shaft reservoir, %；

S_o：r_heatThe average oil saturation of covered pit shaft reservoir, %；

K_channel：High seepage channel coefficient, its span are 0.01%-30%.

In Specific construction design, high seepage channel coefficient should carry out value according to the production status of oil well.

In some embodiments of the invention, the span of the high seepage channel coefficient further comprises：

It is 0.01%-1.99% when the injection cycle of new brought in well is 1-2 rounds；

It is 2.0%-4.99% when the injection cycle of new brought in well is 3-5 rounds；

It is 5%-10% in injection cycle >=6 round of new brought in well；

For being 10.01%-30% due to long-term shutdowns well caused by High water cut.

The fuel factor of heretofore described injection steam includes three kinds of convection current, radiation and heat transfer, and wherein convection current is direct Heating, operating distance is short, rapid-action；Due to being restricted by subsurface reservoir lithosome, operating distance is short for radiation and heat transfer, works Slowly.

Heretofore described term " high seepage channel " refers in the heavy crude reservoir that thermal recovery mode is developed, due to oil reservoir day The permeability that right anisotropism and thermal recovery injection steam erosion are acted on and formed is significantly higher than the local high permeability of adjacent regions Band, this high permeability band are exactly the high seepage channel of flow of fluid in oil reservoir.

Heretofore described term " high seepage channel volume " refers to that thick oil thermal extraction after certain production time, is formed Injection steam or stratum water between well or oil well-edge-bottom water interflow fluid-channeling channel volume.

Heretofore described term " fluid-channeling channel " refers to due to the original anisotropism of oil reservoir or injection steam flush and in oil Formed in Tibetan from a bite oil well or steam injection well to another mouthful of oil well or the high seepage channel of edge-bottom water layer, form high seepage channel Afterwards, thermal recovery injection steam will enter other producing wells along the passage, cause producing well that channeling occurs；Form high permeability path Afterwards, stratum water will enter producing well along the passage, cause producing well that water breakthrough and High water cut or water logging occurs.Near thick oil thermal extraction The formation of steam or stratum water breakthrough circulation road is steamed by reservoir heterogeneity, fluid simulator, completion mode, injection in reservoir The combined factors such as vapour physics chemical action, gravity influence, producing pressure differential are acted on and formed.Specifically, thick oil thermal extraction channelling Passage is with thermal recovery production process, is gradually formed in reservoir, and it is included from channeling well to adjacent oil well or edge-bottom water layer High seepage channel.

As can be seen that in the present invention by calculating high seepage channel volume to know construction when blocking agent design injection rate it is real It is the fluid-channeling channel situation blocked according to oil well needs on border, estimates the amount for needing sealing agent.

According to third aspect of the present invention provide in heavy oil thermal recovery fleeing proof water-blocking construction method formula (IV) can count Calculation obtains the blocking agent detail design injection rate in the plugging construction of well scene to be onstructed.The mould provided according to a second aspect of the present invention The simulated experiment that draft experiment method reservoir model described to the first aspect of the present invention carries out blocking agent injection can be treated The blocking agent experiment amount of being actually implanted into of the blocking agent injection simulated experiment of construction well, and the blocking agent injection simulated experiment of well to be onstructed Blocking agent tests pore-body of the amount of being actually implanted into for permeability filling channel in the pore volume and 50% of high permeability filling channel Product sum.In the blocking agent experiment amount of being actually implanted into and well scene to be onstructed plugging construction of the blocking agent injection simulated experiment of well to be onstructed Blocking agent detail design injection rate between there is certain incidence relation, can calculate its conversion by formula (II) is Number, proportionate relationship thus is set up between the simulation laboratory test and site operation of the present invention, indoor mould is used so as to reach Intend result of the test and instruct the effect of site operation, change current thick oil thermal extraction envelope and alter plug water construction and rely solely on micro-judgment Present situation.

In certain embodiments of the present invention, applied using the heavy oil thermal recovery fleeing proof water blockoff described in third aspect of the present invention Work method can obtain parameters of construction technology, it is possible thereby to obtain efficiently closure thick oil thermal extraction steam or stratum water breakthrough circulation road The performance indications and construction parameter of required blocking agent, for example, apparent viscosity is 30-70mPa.s under reservoir temperature, tool high viscosity and There is strong thixotropy, blocking agent injection upper pressure limit is 8MPa, and blocking agent charge velocity is 1.5v%/hour etc..Can based on above-mentioned parameter Further to carry out the design that thick oil thermal extraction envelope alters plug water construction scheme, and by blocking agent rheology in work progress Property, the control of charge velocity and injection pressure instruct the progress of site operation, ensure that the envelope of thick oil thermal extraction alters plug water construction Effect.

Water-blocking construction method is altered according to the thick oil thermal extraction envelope of the present invention, passes through blocking agent property regulation and injection technology control System, the fluid-channeling channel that can block blocking agent Selective implantation to needs, realizes selective shut-off, effectively controls thick oil thermal extraction Channeling, water breakthrough phenomenon, produced liquid in oil well moisture content is reduced, increase heavy oil production.

Heretofore described term " selective shut-off " refers to that selectivity envelope alters water blockoff, is to causing thermal production well channeling or water The high seepage channel altered targetedly is blocked, and control injection steamchanneling, reduces oil well production water.

According to the reservoir model of the heavy crude heat extraction construction well in terms of above three of the present invention, to described reservoir physics Model, which carries out the analogue experiment method of blocking agent injection and heavy oil thermal recovery fleeing proof water-blocking construction method, can both be independently used for instructing Laboratory test and/or site operation, it can be combined with each other to form a kind of comprehensive heavy oil thermal recovery fleeing proof plug water construction well envelope and alter again Water-blocking construction method, this method can be after selected envelope alter water blockoff plan construction well, the oil reservoir for selected oil well of analyzing and researching, exploitation Data, establish reservoir model and carry out envelope and alter water blockoff simulated test, test different blocking agent performances and construction technology indoors to closure The influence of effect, success rate and the optimal scheme of effect of increasing production are filtered out with reference to site operation requirement, blocking agent is formed and selectively seals Alter the detail design of water blockoff.This method successfully solves thick oil thermal extraction and seals three key issues altered during water blockoff：

First, oil well needs the fluid-channeling channel situation blocked, estimates the volume that need to be blocked and sealing agent dosage.

Second, realize the sealing agent performance requirement that effectively closure needs.

3rd, the selective shut-off to fluid-channeling channel how is realized in construction.

The 4th aspect of the present invention provides a kind of construction method according to third aspect of the present invention in viscous crude heat Adopt well and selectively seal the application altered in water blockoff site operation.

In the specific embodiment of the present invention, the heavy crude heat extraction for steam channeling or stratum water water breakthrough occurs Well, the construction that blocking agent envelope alters water blockoff is carried out, forms site operation scheme.The construction method comprises the following steps：

1) construction well reservoir model is established；

2) carry out simulating sealing agent injection testing, obtain detail design data；

3) the sealing agent volume of plugging construction injection is calculated；

4) Design of Performance of sealing agent is carried out；

5) plugging construction scene scheme is worked out；

6) plugging construction is carried out.

For this method through field application, achieving significantly reduces aqueous and effect of increasing production.

Term " blocking agent " used is also known as " sealing agent " in the present invention, refers to prepare and inject on ground in subterranean oil gas reservoir, The chemical agent or chemical agent composition that the high seepage channel of entry well fluid channelling can be blocked.Blocking agent basic recipe, example Such as can be：The filler of+10% crosslinking agent of 5% stabilizer+20%.

Heretofore described term " charge velocity " refers to blocking agent injection rate and injection blocking agent cumulative volume in the unit interval Than laboratory test and site operation can be united by conversion coefficient η.

Heretofore described term " stratum water " or " oil-reservoir water " refer to the Bian Shui and bottom water, layer of oil reservoir edge and bottom Between water and the general name with crude oil with the irreducible water of layer.The water remained in when irreducible water is reservoir formation in hole, it and oil gas Coexist but be not involved in flowing, but its distribution characteristics in oil reservoir microscopic void directly affects oil reservoir oil saturation.

Heretofore described term " simulated formation water " refers to according to contained zwitterion quantity and ratio in certain stratum water Example, prepared indoors using distilled water and various salts, composition and the stratum aqueous phase with or similar salinity water.

Heretofore described term " reservoir sand " refers to heavy oil wells in process of production, the storage produced with profit from underground (Chinese heavy crude reservoir is most of all to be existed and in loose sand, the main composition of reservoir rock is exactly loose cementation layer sand grains Sand grains).

Heretofore described term " simulated formation sand " refers to the particle size range and particle diameter distribution rule according to reservoir sand, chooses The quartz sand of the similar particle size range selected and particle diameter distribution rule.

Heretofore described term " Simulation of Crude Oil " refers to the dewatered oil for treating plugging construction heavy oil wells output, or adjacent The dewatered oil of well output.

Heretofore described term " water survey permeability " refers to the method for testing according to permeability, using distilled water as survey Examination medium carries out testing resulting permeability.

Heretofore described term " blocking agent leading edge " or " leading edge of blocking agent " refer on blocking agent injection direction that injection blocking agent pushes away Enter the front end of leading edge.

Heretofore described term " middle part of middle permeability filling channel " refers to middle permeability filling channel in the axial direction Physical midpoint residing for radial section (section).

Term " single channel reservoir model " of the present invention refers to be filled out completely by profit in various degree by three respectively What the passage filled was made is covered each by the reservoir model of high, medium and low three permeability ranges.

Because heavy oil production proportion rises year by year in domestic crude output, with going deep into for Development of Viscous Crude Oil, in The viscous crude main force such as state's petrochemical industry Shengli Oil Field, Henan Oil Field producing region has been enter into the tail period stage, and thick oil thermal extraction is often in life After producing several cycles, production fluid is aqueous to rise to more than 80%.The increase of production fluid intractability, is largely reduced thick The recovery ratio and economic benefit of oily Simulation on whole pay zones.Therefore, using the present invention heavy crude heat extraction well to be onstructed reservoir model, The analogue experiment method of blocking agent injection is carried out to described reservoir model and heavy oil thermal recovery fleeing proof water-blocking construction method enters Row envelope alters plug water construction, once entering practicality, will produce huge economic and social profit, application prospect is very wide.

Brief description of the drawings

Illustrate the present invention below in conjunction with accompanying drawing.

Fig. 1 is certain oil field X oil recovery factories B well plug water construction pressure curves in the embodiment of the present invention 5

Embodiment

To make the present invention easier to understand, the present invention is described in detail below in conjunction with embodiment and accompanying drawing, these realities Apply example only serve it is illustrative, it is not limited to application of the invention.

Embodiment

Embodiment 1：

Using the physical model of the present invention, the indoor mould before plugging construction is carried out to certain oil-field thick-oil thermal recovery producing well A1 wells Intend experiment and detail design, the reservoir maximum permeabilities of A1 wells to be onstructed is 500mD, minimum permeability is 100mD, has produced 6 Round, physical model and analogue experiment method using the present invention are illustrated by taking the detail design of this mouthful of well and implementation result as an example The method for carrying out detail design, detailed process are as follows：

(1) the single channel reservoir model of heavy crude heat extraction well to be onstructed is established

The reservoir of heavy oil thermal recovery fleeing proof plug water construction well is established using the reservoir sand of A1 well outputs, crude oil and stratum water sample Physical model, produces the filling channel of high, medium and low three permeability ranges, and is filled up completely with respectively with crude oil, stratum water, The detailed data of three filling channels is as follows：

High permeability filling channel：1.0 meters of length, interior diameter 100mm, outside material are stainless steel, and permeability is 655mD, pore volume 183cm³, 100% stratum water.

Middle permeability filling channel：1.0 meters of length, interior diameter 100mm, outside material are stainless steel, and permeability is 295mD, pore volume 140cm³, wherein fluid 60% is stratum water, 40% is crude oil.

Low-permeability filling channel：1.0 meters of length, interior diameter 100mm, outside material are stainless steel, permeability 79mD, Pore volume 110cm³, 100% crude oil.

(2) sealing agent injection simulated test is carried out to the reservoir model of the heavy crude heat extraction established well to be onstructed, asked Take detail design data

In (I) above-mentioned reservoir model blocking agent experiment the amount of being actually implanted into be high permeability filling channel pore volume with Permeability filling channel pore volume sum, i.e. 253cm in 50%³。

(II) calculates A1 wells closure water breakthrough passage by formula (IV) needs sealing agent detail design injection rate：

In formula (IV)：

V_x：High seepage channel volume, m³；

M_oil：Oil well cumulative oil production, m³；

π：3.14；

r_heat：Only rely on heat transfer, the covering radius of steam fuel factor, m；

r_heatThe average pore of covered pit shaft reservoir, %；

S_o：r_heatThe average oil saturation of covered pit shaft reservoir, %；

K_channel：High seepage channel coefficient, span：0.01-30%；

A1 wells calculate data value, oil well cumulative oil production 3765m³, effective pay thickiness L takes 5.8m, r_heat=25m, hole PorosityAverage oil saturation ρ=50%, K_channelValue is 10%, then calculates V_x(the i.e. detail design of blocking agent Dosage) be：267m³。

(III) opens injection pump, and sealing agent is injected to three filling channels in parallel with certain injection rate, and collect, That measures high, medium and low three different permeability filling channel ports of export goes out liquid situation, the central permeability filling channel port of export When liquid outlet quantity reaches the 45%-55% of its pore volume, you can be considered as sealing agent leading edge reached in permeability filling channel Middle part.Repetition test, blocking agent experiment apparent viscosity and blocking agent experiment injection rate are constantly adjusted, is actually implanted into blocking agent When amount reaches blocking agent empirical theory injection rate, the middle part of permeability filling channel in the leading edge arrival of sealing agent is injected, and is recorded Related data is as follows：

Blocking agent tests apparent viscosity：40mPa.s；

Blocking agent tests injection rate：0.80ml/min；

The initial injection pressure of blocking agent experiment：0.0MPa；

Blocking agent tests flowing pressure gradient：0.015MPa/ml；

Blocking agent experiment closure pressure：6.2MPa；

Experiment viscous crude mutually starts pressure：9MPa.

(3) according to experiment and well information, the Design of Performance of resistance to sealing agent is completed

Because the yardstick and live injection device and reservoir scale difference of laboratory test instrument are very big, tried through indoor and scene It is 17.2 × 10 to test the conversion coefficient η that evaluation is obtained between blocking agent experiment injection rate and blocking agent detail design injection rate⁴, meter It is 140L/min that calculation, which obtains corresponding blocking agent detail design injection rate,.

The blocking agent detail design dosage and blocking agent detail design injection rate meter determined according to A1 wells data and experiment parameter Calculate, 267m is completed with 140L/min speed³Blocking agent detail design injection length is 31.78 hours, then the detail design of blocking agent is normal Warm consolidation time should be greater than 32 hours, to ensure construction safety.

It is according to the plugging construction parameter that logistics organizations determine：

Sealing agent detail design apparent viscosity：40mPa.s；

Sealing agent detail design injection rate：140L/min；

Sealing agent detail design initially injects pressure：0.0MPa；

Detail design maximum pressure is equal to experiment viscous crude and mutually starts pressure：9MPa.

Embodiment 2：

Using the physical model of the present invention, the indoor mould before plugging construction is carried out to certain oil-field thick-oil thermal recovery producing well A2 wells Draft experiment and detail design, the reservoir maximum permeabilities of A2 wells to be onstructed is 1000mD, minimum permeability is 300mD, has produced 4 Round, physical model and analogue experiment method using the present invention are illustrated by taking the detail design of this mouthful of well and implementation result as an example The method for carrying out detail design, detailed process are as follows：

The reservoir of heavy oil thermal recovery fleeing proof plug water construction well is established using the reservoir sand of A2 well outputs, crude oil and stratum water sample Physical model, produces the filling channel of high, medium and low three permeability ranges, and is completely filled with respectively with crude oil, stratum water, The detailed data of three filling channels is as follows：

High permeability filling channel：Length 600mm, interior diameter 200mm, outside material are stainless steel, and permeability is 1100mD, pore volume 210cm³, 100% stratum water.

Middle permeability filling channel：Length 600mm, interior diameter 200mm, outside material are stainless steel, and permeability is 800mD, pore volume 160cm³, wherein fluid 50% is stratum water, 50% is crude oil.

Low-permeability filling channel：Length 600mm, interior diameter 200mm, outside material are stainless steel, and permeability is 150mD, pore volume 120cm³, 100% crude oil.

In (I) above-mentioned reservoir model blocking agent experiment the amount of being actually implanted into be high permeability filling channel pore volume with Permeability filling channel pore volume sum, i.e. 290cm in 50%³。

(II) calculates A2 wells closure water breakthrough passage by formula (IV) needs sealing agent detail design injection rate：

In formula (IV)：

V_x：High seepage channel volume, m³；

M_oil：Oil well cumulative oil production, m³；

π：3.14；

r_heatThe average pore of covered pit shaft reservoir, %；

S_o：r_heatThe average oil saturation of covered pit shaft reservoir, %；

K_channel：High seepage channel coefficient, span：0.01-30%；

A2 wells calculate data value, oil well cumulative oil production 4700m³, effective pay thickiness L takes 7m, r_heat=20m, hole DegreeAverage oil saturation ρ=45%, K_channelValue is 4.9%, then calculates V_x(i.e. the detail design of blocking agent is used Amount) be：180m³。

Blocking agent tests apparent viscosity：26mPa.s；

Blocking agent tests injection rate：0.90ml/min；

The initial injection pressure of blocking agent experiment：0.0MPa；

Blocking agent tests flowing pressure gradient：0.010MPa/ml；

Blocking agent experiment closure pressure：5.0MPa；

Experiment viscous crude mutually starts pressure：7.5MPa.

Because the yardstick and live injection device and reservoir scale difference of laboratory test instrument are very big, tried through indoor and scene It is 20.0 × 10 to test the conversion coefficient η that evaluation is obtained between blocking agent experiment injection rate and blocking agent detail design injection rate⁴, meter It is 180L/min that calculation, which obtains corresponding blocking agent detail design injection rate,.

The blocking agent detail design dosage and blocking agent detail design injection rate meter determined according to A2 wells data and experiment parameter Calculate, 180m is completed with 180L/min speed³The detail design injection length of blocking agent is 10.0 hours, then the detail design of blocking agent is normal Warm consolidation time should be much larger than 40 hours, to ensure construction safety.

Blocking agent detail design apparent viscosity：26mPa.s；

Blocking agent detail design injection rate：180L/min；

Blocking agent detail design initially injects pressure：0.0MPa；

Detail design maximum pressure：7.5MPa.

Embodiment 3：

The indoor mould before plugging construction is carried out to certain oil-field thick-oil thermal recovery producing well A3 wells using the physical model of the present invention Draft experiment and detail design, the reservoir maximum permeabilities of A3 wells to be onstructed is 800mD, minimum permeability is 100mD, has produced 2 Round, physical model and analogue experiment method using the present invention are illustrated by taking the detail design of this mouthful of well and implementation result as an example The method for carrying out detail design, detailed process are as follows：

The reservoir of heavy oil thermal recovery fleeing proof plug water construction well is established using the reservoir sand of A3 well outputs, crude oil and stratum water sample Physical model, produces the filling channel of high, medium and low three permeability ranges, and is completely filled with respectively with crude oil, stratum water, The detailed data of three filling channels is as follows：

High permeability filling channel：Length 200mm, interior diameter 50mm, outside material are stainless steel, permeability 840mD, Pore volume 28cm³, 100% stratum water.

Middle permeability filling channel：Length 200mm, interior diameter 50mm, outside material are stainless steel, permeability 640mD, Pore volume 20cm³, wherein fluid 40% is stratum water, 60% is crude oil.

Low-permeability filling channel：Length 200mm, interior diameter 50mm, outside material are stainless steel, permeability 50mD, Pore volume 8cm³, 100% crude oil.

In (I) above-mentioned reservoir model blocking agent experiment the amount of being actually implanted into high permeability filling channel pore volume with Permeability filling channel pore volume sum, i.e. 38cm in 50%³。

(II) calculates A3 wells closure water breakthrough passage by formula (IV) needs sealing agent detail design injection rate：

In formula (IV)：

V_x：High seepage channel volume, m³；

M_oil：Oil well cumulative oil production, m³；

π：3.14；

r_heatThe average pore of covered pit shaft reservoir, %；

S_o：r_heatThe average oil saturation of covered pit shaft reservoir, %；

K_channel：High seepage channel coefficient, span：0.01-30%；

A3 wells calculate data value, oil well cumulative oil production 3000m³, effective pay thickiness L takes 5m, r_heat=20m, hole DegreeAverage oil saturation ρ=50%, K_channelValue is 1.9%, then calculates V_x(i.e. the detail design of blocking agent is used Amount) it is ≈ 40m³。

(III) opens injection pump, and sealing agent is injected to three filling channels in parallel with certain injection rate, and collect, That measures high, medium and low three different permeability filling channel ports of export goes out liquid situation, the central permeability filling channel port of export When liquid outlet quantity reaches the 45%-55% of its pore volume, you can be considered as the middle part of permeability filling channel during sealing agent has reached. Repetition test, blocking agent experiment apparent viscosity and blocking agent experiment injection rate are constantly adjusted, reaches the blocking agent experiment amount of being actually implanted into During blocking agent empirical theory injection rate, the middle part of permeability filling channel in the leading edge arrival of sealing agent is injected, and records dependency number According to as follows：

Blocking agent tests apparent viscosity：22mPa.s；

Blocking agent tests injection rate：0.60ml/min；

The initial injection pressure of blocking agent experiment：0.0MPa；

Blocking agent tests flowing pressure gradient：0.015MPa/ml；

Blocking agent experiment closure pressure：6.0MPa；

Experiment viscous crude mutually starts pressure：10.0MPa.

Because the yardstick and live injection device and reservoir scale difference of laboratory test instrument are very big, tried through indoor and scene It is 15.0 × 10 to test the conversion coefficient η that evaluation is obtained between blocking agent experiment injection rate and blocking agent detail design injection rate⁴, meter It is 90L/min that calculation, which obtains corresponding blocking agent detail design injection rate,.

The blocking agent detail design dosage and blocking agent detail design injection rate meter determined according to A3 wells data and experiment parameter Calculate, 40m is completed with 90L/min speed³Blocking agent detail design injection length is 7.4 hours, then the detail design normal temperature of blocking agent is consolidated Tying the time should be much larger than 60 hours, to ensure construction safety.

Blocking agent detail design apparent viscosity：22mPa.s；

Blocking agent detail design injection rate：90L/min；

Blocking agent detail design initially injects pressure：0.0MPa；

Detail design maximum pressure：10MPa.

Embodiment 4：

The indoor mould before plugging construction is carried out to certain oil-field thick-oil thermal recovery producing well A4 wells using the physical model of the present invention Draft experiment and detail design, the reservoir maximum permeabilities of A4 wells to be onstructed is 2000mD, minimum permeability is 500mD, has produced 8 Round, physical model and analogue experiment method using the present invention are illustrated by taking the detail design of this mouthful of well and implementation result as an example The method for carrying out detail design, detailed process are as follows：

The reservoir of heavy oil thermal recovery fleeing proof plug water construction well is established using the reservoir sand of A4 well outputs, crude oil and stratum water sample Physical model, produces the filling channel of high, medium and low three permeability ranges, and is completely filled with respectively with crude oil, stratum water, The detailed data of three filling channels is as follows：

High permeability filling channel：Length 400mm, interior diameter 20mm, outside material are High molecular weight polyethylene, permeability For 3000mD, pore volume 112cm³, 100% stratum water.

Middle permeability filling channel：Length 400mm, interior diameter 20mm, outside material are High molecular weight polyethylene, permeability For 1980mD, pore volume 100cm³, wherein fluid 40% is stratum water, 60% is crude oil.

Low-permeability filling channel：Length 400mm, interior diameter 20mm, outside material are High molecular weight polyethylene, permeability For 300mD, pore volume 60cm³, 100% crude oil.

In (I) above-mentioned reservoir model blocking agent experiment the amount of being actually implanted into be high permeability filling channel pore volume with Permeability filling channel pore volume sum, i.e. 162cm in 50%³。

(II) calculates A4 wells closure water breakthrough passage by formula (IV) needs sealing agent detail design injection rate：

In formula (IV)：

V_x：High seepage channel volume, m³；

M_oil：Oil well cumulative oil production, m³；

π：3.14；

r_heatThe average pore of covered pit shaft reservoir, %；

S_o：r_heatThe average oil saturation of covered pit shaft reservoir, %；

K_channel：High seepage channel coefficient, span：0.01-30%；

A4 wells calculate data value, oil well cumulative oil production 7600m³, effective pay thickiness L takes 20m, r_heat=20m, hole PorosityAverage oil saturation ρ=35%, K_channelValue is 15%, then calculates V_x(the i.e. detail design of blocking agent Dosage) it is ≈ 690m³。

Blocking agent tests apparent viscosity：20mPa.s；

Blocking agent tests injection rate：140ml/min；

The initial injection pressure of blocking agent experiment：0.0MPa；

Blocking agent tests flowing pressure gradient：0.018MPa/ml；

Blocking agent experiment closure pressure：5.0MPa；

Experiment viscous crude mutually starts pressure：6.0MPa.

Because the yardstick and live injection device and reservoir scale difference of laboratory test instrument are very big, tried through indoor and scene It is 15.7 × 10 to test the conversion coefficient η that evaluation is obtained between blocking agent experiment injection rate and blocking agent detail design injection rate⁴, meter It is 220L/min that calculation, which obtains corresponding blocking agent detail design injection rate,.

The blocking agent detail design dosage and blocking agent detail design injection rate meter determined according to A4 wells data and experiment parameter Calculate, 690m is completed with 220L/min speed³The detail design injection length of blocking agent is 52 hours, then the detail design normal temperature of blocking agent Consolidation time should be much larger than 60 hours, to ensure construction safety.

Blocking agent detail design apparent viscosity：20mPa.s；

Blocking agent detail design injection rate：220L/min；

Blocking agent detail design initially injects pressure：0.0MPa；

Detail design maximum pressure：6.0MPa.

Embodiment 5：

The lab simulation before plugging construction is carried out to certain oil-field thick-oil thermal recovery producing well B wells using the physical model of the present invention Experiment and detail design, the reservoir maximum permeabilities of B wells to be onstructed is 2000mD, minimum permeability is 500mD, has produced 10 wheels It is secondary, illustrate to enter using the physical model and analogue experiment method of the present invention by taking the detail design of this mouthful of well and implementation result as an example The method of row detail design, detailed process are as follows：

Because B wells are long-term shutdowns well, it is impossible to be collected into the reservoir sand sample, crude oil sample and stratum water sample of the well output Product.Therefore the relevant information according to the well and adjacent well situation, selection particle diameter are the bead of 10-40 scopes as simulated formation Sand, using the viscous crude of B wells periphery producing well output as simulation oil, using 20,000 salinity water of indoor preparation as simulated formation water, make Go out the filling channel of high, medium and low three permeability ranges, and be completely filled with respectively with simulation oil, water, three filling channels it is detailed Count accurately according to as follows：

High permeability filling channel：0.5 meter, interior diameter 2.54mm, permeability 450mD of length, pore volume 102cm³, 100% simulated formation water.

Middle permeability filling channel：0.5 meter, interior diameter 2.54mm, permeability 295mD of length, pore volume 96cm³, Wherein fluid 40% is simulated formation water, 60% is Simulation of Crude Oil.

Low-permeability filling channel：0.5 meter, interior diameter 2.54mm, permeability 118mD of length, pore volume 90cm³, 100% Simulation of Crude Oil.

(2) sealing agent injection simulated test is carried out to the reservoir model of the heavy crude heat extraction well to be onstructed of foundation, asked for Detail design data

In (I) above-mentioned reservoir model blocking agent experiment the amount of being actually implanted into be high permeability filling channel pore volume with Permeability filling channel pore volume sum, i.e. 150cm in 50%³。

The sealing agent volume that (II) is needed to inject by formula (IV) calculating B well closure water breakthrough passages：

In formula (IV)：

V_x：High seepage channel volume, m³；

M_oil：Oil well cumulative oil production, m³；

π：3.14；

r_heatThe average pore of covered pit shaft reservoir, %；

S_o：r_heatThe average oil saturation of covered pit shaft reservoir, %；

K_channel：High seepage channel coefficient, span：0.01-30%；

B wells calculate data value, oil well cumulative oil production 1778m³, effective pay thickiness L takes 7.4m, r_heat=20m, hole PorosityAverage oil saturation ρ=45, K_channelValue is 27%, then calculates V_x(i.e. the detail design of blocking agent is used Amount) be：129.8m³。

(III) opens injection pump, and sealing agent is injected to three filling channels in parallel with certain injection rate, and collect, That measures high, medium and low three different permeability filling channel ports of export goes out liquid situation, the central permeability filling channel port of export When liquid outlet quantity reaches the 50% of its pore volume, you can be considered as the middle part of permeability filling channel during sealing agent has reached.Repeatedly Experiment, blocking agent experiment apparent viscosity and blocking agent experiment injection rate are constantly adjusted, the blocking agent experiment amount of being actually implanted into is reached blocking agent During empirical theory injection rate, the middle part of permeability filling channel in the leading edge arrival of sealing agent is injected, and records related data such as Under：

Blocking agent tests apparent viscosity：32mPa.s；

Blocking agent tests injection rate：0.85ml/min；

The initial injection pressure of blocking agent experiment：0.0MPa；

Blocking agent tests flowing pressure gradient：0.012MPa/ml；

Blocking agent experiment closure pressure：8.4MPa；

Experiment viscous crude mutually starts pressure：10MPa.

(3) according to experiment and well information, optimize sealing agent performance, determine construction parameter

Because the yardstick and live injection device and reservoir scale difference of laboratory test instrument are very big, tried through indoor and scene It is 1.76 × 10 to test the conversion coefficient η that evaluation is obtained between blocking agent experiment injection rate and blocking agent detail design injection rate⁵, meter It is 150L/min that calculation, which obtains corresponding blocking agent detail design injection rate,.

The blocking agent detail design dosage and blocking agent detail design injection rate meter determined according to B wells data and experiment parameter Calculate, 129.8m is completed with 150L/min speed³The detail design injection length of blocking agent is 14.42 hours, then the construction of blocking agent is set Counting the normal temperature consolidated time should be much larger than 140 hours, to ensure construction safety.

(4) complete design prepares, establishment closure Field design

By above step, it has been determined that the technical parameter of Construction control, will according to blocking agent performance design in make-up station Ask and complete blocking agent preparation, and after the assay was approved, transport standby to B wells well site.

Site operation program：

A. blocking agent slug 130m is just squeezed³, it is 0.15m strictly to control injection pump speed³/min；

B. anti-crowded clear water displacement fluid 15m³, just squeezing clear water and crossing displacement fluid 20m³。

C. closing well reaction 6-12 hours, punching is visited to sand control Position on the top of the fish, using sewage high flow rate washover to going out well liquid outward appearance Cleaning, act water plugging string, prepare steam injection.

Job site technical controlling main points：

In (I) blocking agent injection process, it should ensure that bottomhole injection pressure mutually starts pressure 10MPa less than viscous crude, once pressure Reach 10MPa, even if 130m³Blocking agent is not yet fully injected into, and also should immediately be stopped injecting, be started to replace.

A cementing truck connects sleeve gate in (II) work progress, it is desirable to is beaten clearly according to condition of construction sleeve pipe in work progress Water displacement fluid, it can adjust according to site operation situation.

(III) envelope, which alters plug water construction, to be combined closely with steam injection, after envelope alters plug water construction, should start steam injection as early as possible, to promote Enter blocking agent solidification, produce plugging effect.

(5) B wells carry out plugging construction

On June 30th, 2013, B well plugging constructions are carried out in X oil recovery factories.Site operation injects temperature-sensitive phase in version gel and blocked up altogether Agent 130m³, strict implement design requirement in work progress, operation pressure curve is shown in Fig. 1.It will be seen from figure 1 that in site operation Blocking agent injection pressure meet the result of the test of reservoir model in the present invention.According to indoor physical simulation experiment side of the present invention Method obtains parameter, works out detail design, and guides construction, ensured that plugging construction smoothly completes.

On August 11st, 2013, B wells produce liquid 36.2t/d daily after going into operation, and day oil-producing 8.4t/d, comprehensive water cut drops to 76.8%, only produce 20 days and just increase oily 114t.The B well plugging constructions carried out by the inventive method succeed, and achieve significantly Reduction is aqueous and effect of increasing production.

The present inventor utilizes the reservoir model of the heavy oil thermal recovery fleeing proof water blockoff well to be onstructed of the present invention, to institute The reservoir model stated carries out the simulated experiment of blocking agent injection, and the parameter obtained using simulated experiment designs heavy crude heat extraction Envelope alters plug water construction parameter, is derived from heavy oil thermal recovery fleeing proof water-blocking construction method, and implement certain oil field X using this method and adopt The heavy oil wells water blockoff turn-week construction of oily factory B wells.On August 11st, 2013, B wells produce liquid 36.2t/d, day oil-producing 8.4t/ daily after going into operation D, comprehensive water cut drop to 76.8%, only produce 20 days and just increase oily 114t.The B wells plugging construction carried out by the inventive method obtains Success, achieving significantly reduces aqueous and effect of increasing production.

The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.

Claims

1. a kind of single channel reservoir model of heavy crude heat extraction well to be onstructed, it includes three filling channels being arranged in parallel, The filling channel is made up of the filler loaded in passage and passage, and the filler includes reservoir sand, crude oil and ground Layer water or simulated formation sand, Simulation of Crude Oil and simulated formation water；

Three filling channels are respectively：High permeability filling channel, middle permeability filling channel and low-permeability filling channel, its In,

High permeability filling channel：Water surveys the 100%-150% that permeability is well reservoir maximum permeability to be onstructed, stream therein Body 100% is stratum water or simulated formation water；

Middle permeability filling channel：Water surveys the 80%-99% that permeability is well reservoir maximum permeability to be onstructed, fluid therein Middle 40%-60% is stratum water or simulated formation water, and 40%-60% is crude oil or Simulation of Crude Oil；

Low-permeability filling channel：Water surveys the 50%-79% that permeability is well reservoir minimum permeability to be onstructed, fluid therein 100% is crude oil or Simulation of Crude Oil.

2. reservoir model according to claim 1, it is characterised in that high permeability filling channel and middle permeability are filled out The span for filling the water survey permeability of passage is chosen according to the steam of well to be onstructed injection periodicity, wherein,

The water of high permeability filling channel surveys permeability：

When it is 1-2 rounds to inject the cycle, 100%-110% is chosen；

When it is 3-5 rounds to inject the cycle, 111%-130% is chosen；

When injecting cycle >=6 round, 131%-150% is chosen；

The water of middle permeability filling channel surveys permeability：

When it is 4-6 rounds to inject the cycle, 80%-90% is chosen；

When injecting cycle >=7 round, 91%-99% is chosen.

3. reservoir model according to claim 1, it is characterised in that after filling channel tests permeability, according to The recovery percent of reserves of well to be onstructed is chosen different fluid centering permeability filling channel and filled, so that middle permeability filling channel In interstitial space be completely filled with, wherein,

When recovery percent of reserves is more than 15%, 50%-60% is stratum water or simulated formation water in fluid therein；

4. the reservoir model according to any one in Claim 1-3, it is characterised in that

The radial section of the passage is polygon, circle or ellipse；

Forming the material of the exterior contour of the passage includes metal, high polymer material or hydraulicity inorganic coagulation material.

5. reservoir model according to claim 3, it is characterised in that

The section of the passage is circle, and the length of the passage is 200.0-1000.0mm, internal diameter 20.0-200.0mm；

The tubing for forming the exterior contour of the passage is straight tube.

6. reservoir model according to claim 2, it is characterised in that after filling channel tests permeability, according to The recovery percent of reserves of well to be onstructed is chosen different fluid centering permeability filling channel and filled, so that middle permeability filling channel In interstitial space be completely filled with, wherein,

7. reservoir model according to claim 6, it is characterised in that

The radial section of the passage is polygon, circle or ellipse；

8. reservoir model according to claim 7, it is characterised in that

The tubing for forming the exterior contour of the passage is straight tube.

9. the reservoir model in a kind of 1-8 to claim described in any one carries out the simulated experiment side of blocking agent injection Method, it includes：

Step A, blocking agent is injected in three filling channels；

Step B, judge to inject the middle part of permeability filling channel during whether blocking agent leading edge reaches, and do not reached in blocking agent leading edge During the middle part of middle permeability filling channel, adjustment blocking agent experiment apparent viscosity and blocking agent experiment injection rate so that real in blocking agent When testing the amount of being actually implanted into and being equal to blocking agent empirical theory injection rate, the middle part of permeability filling channel during injection blocking agent leading edge reaches；

Step C, records experimental process parameters, and the experimental process parameters include blocking agent experiment apparent viscosity, blocking agent experiment injection Speed, the initial injection pressure of blocking agent experiment, blocking agent experiment flowing pressure gradient, blocking agent experiment closure pressure mutually open with experiment viscous crude Dynamic pressure；

In stepb, keep the blocking agent experiment amount of being actually implanted into constant；

The blocking agent experiment amount of being actually implanted into is permeability filling channel pore-body in high permeability filling channel pore volume and 50% Product sum；

The blocking agent empirical theory injection rate is in aqueous phase volume and middle permeability filling channel in high permeability filling channel Oil phase and/or aqueous phase volume 45%-55% sums.

10. analogue experiment method according to claim 9, it is characterised in that in stepb, central permeability filling is logical The liquid outlet quantity of the road port of export equivalent to middle permeability filling channel total pore size volume 45%-55% when, then be judged as that injection is stifled The middle part of permeability filling channel during agent leading edge has reached.

11. the analogue experiment method according to claim 9 or 10, it is characterised in that in stepb, adjustment blocking agent experiment Apparent viscosity and blocking agent experiment injection rate, make blocking agent experiment injection pressure reach blocking agent experiment closure pressure value when, at least 60v%-80v% blocking agent is injected among high permeability filling channel.

12. a kind of heavy oil thermal recovery fleeing proof water-blocking construction method, its detail design technological parameter is according to any in claim 9-11 The experimental process parameters that analogue experiment method described in one is obtained, which calculate, to be obtained, wherein,

In formula (I),

The unit of blocking agent detail design injection rate is L/min；

The unit of blocking agent experiment injection rate is ml/min；

η is the conversion coefficient between blocking agent experiment injection rate and blocking agent detail design injection rate, is carried out according to formula (II) Calculate：

η span is 1.0 × 10⁵-15.0×10⁵；

The blocking agent detail design normal temperature cure time is 1-10 times of blocking agent detail design injection length, the blocking agent detail design note The angle of incidence is calculated according to formula (III)：

Hour (III).

13. construction method according to claim 12, it is characterised in that the blocking agent detail design injection rate is equal to hypertonic Circulation road volume, the high seepage channel volume are calculated according to formula (IV)：

<mrow> <msub> <mi>V</mi> <mi>X</mi> </msub> <mo>=</mo> <mrow> <mo>(</mo> <msub> <mi>M</mi> <mrow> <mi>o</mi> <mi>i</mi> <mi>l</mi> </mrow> </msub> <mo>-</mo> <mi>L</mi> <mo>&times;</mo> <mi>&pi;</mi> <mo>&times;</mo> <msubsup> <mi>r</mi> <mrow> <mi>h</mi> <mi>e</mi> <mi>a</mi> <mi>t</mi> </mrow> <mn>2</mn> </msubsup> <mo>&times;</mo> <mi>&phi;</mi> <mo>&times;</mo> <msub> <mi>S</mi> <mi>o</mi> </msub> <mo>)</mo> </mrow> <mo>&times;</mo> <msub> <mi>K</mi> <mrow> <mi>c</mi> <mi>h</mi> <mi>a</mi> <mi>n</mi> <mi>n</mi> <mi>e</mi> <mi>l</mi> </mrow> </msub> <mo>&divide;</mo> <mn>10000</mn> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mi>I</mi> <mi>V</mi> <mo>)</mo> </mrow> </mrow>

In formula (IV)：

Vx：High seepage channel volume, m³；

M_oil：Oil well cumulative oil production, m³；

π：3.14；

r_heatThe average pore of covered pit shaft reservoir, %；

S_o：r_heatThe average oil saturation of covered pit shaft reservoir, %；

K_channel：High seepage channel coefficient, its span are 0.01%-30%.

14. construction method according to claim 13, it is characterised in that the span of the high seepage channel coefficient is entered One step includes：

It is 5%-10% in injection cycle >=6 round of new brought in well；

For being 10.01%-30% due to long-term shutdowns well caused by High water cut.

15. the construction method in a kind of 12-14 according to claim described in any one is altered stifled in thick oil thermal extraction selectively envelope Application in water site operation.