CN102628350B - Propane-injecting shallow heavy oil reservoir exploitation method - Google Patents
Propane-injecting shallow heavy oil reservoir exploitation method Download PDFInfo
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Abstract
The invention relates to a propane-injecting shallow heavy oil reservoir exploitation method. The propane-injecting shallow heavy oil reservoir exploitation method includes the following steps: a horizontal injection and production well network is arranged in a shallow heavy oil reservoir exploitation area, an injection well and a production well are arranged in the oil layers at the same vertical plane position to form an injection and production well pair, the injection well is a horizontal injection well, the production well is a horizontal production well, and the horizontal injection and production well network comprises at least one injection and production well pair; injected steam circulation preheating is carried out simultaneously via the injection well and the production well; after the temperature of the oil layer between the horizontal section of the injection well and the horizontal section of the production well is increased to a predetermined temperature, the injection well and the production well simultaneously stop circulation preheating, propane starts to be continuously injected into the injection well, and the amount of the injected propane is 5000m3/d to 25000m3/d; and the production well starts continuous oil production. The propane-injecting shallow heavy oil reservoir exploitation method has the characteristics of high recovery rate, propane recycling, low exploitation cost, high economic benefit, low energy consumption, low emission, environment-friendliness and the like, and is easy and safe to operate.
Description
Technical field
The present invention relates to the exploitation method of the heavy crude reservoir in a kind of oil field, relate in particular to a kind of Shallow Heavy Oil Reservoir note propane exploitation method, belong to field of petroleum exploitation.
Background technology
Viscous crude is largest crude resources type of whole world 21st century.World's crude oil gross reserves is approximately trillion tons of 1.4-2.1, and wherein 70% is common heavy oil, super viscous crude and oil-sand.Viscous crude resource is mainly distributed in the countries and regions such as Canada, Venezuela, the U.S., China, 18,000,000,000 tons of China's viscous crude stock numbers, and reserves are huge.Open source information shows, the output of viscous crude, oil-sand will reach 50% of world's crude output in 20 years following, become the important component part that world energy sources is supplied with.Ge great You company of the world researches and develops with resource mobility the Technology of Heavy Oil Recovery as significant development strategy.
Because the underground viscosity of viscous crude is high, flow difficulties, therefore adopts conventional cold mining method to yield poorly, and recovery ratio is low, and development effectiveness is poor.But Viscosity of Heavy Crude Oil is very responsive for temperature, along with temperature raises, Crude viscosity sharply reduces, mobility significantly improves, therefore at present the mode of thickened oil recovery is mainly to take measures to improve crude oil fluidity, improve profit mobility and recently improve crude oil swept volume and displacement efficiency in world wide, and the exploitation agent technology of heavy crude reservoir is mainly the heating exploitation technology such as steam soak, steam flooding, combustion in situ, SAGD (SAGD).
Steam soak technology refers to periodically injects a certain amount of wet saturated steam in oil reservoir, and the crude oil in the certain limit of heating near wellbore zone reduces its viscosity, boils in a covered pot over a slow fire the method for the crude oil extraction that drives a well after well a period of time by closing well.But steam soak is a kind of step-down exploitation method that consumes stratum energy in essence, for Shallow Heavy Oil Reservoir, especially reservoir buried depth is less than the heavy crude reservoir of 500m, because the pressure of oil reservoir own is little, little energy, therefore steam soak is short cycle time, and the economical and effective cycle is few, and recovery ratio is 8%-15% only.
The main body substituted technique of steam flooding after as a kind of steam soak, on steam soak basis, can improve recovery ratio more than 20%, obtained successful Application in oil fields such as U.S. Kern River, but due to continuously steam injection of needs, the greenhouse gas emissions that ground boiler combustion produces are large; Steam injection is large to the heat waste of top bottom layer simultaneously, and steam energy consumption is large, produces steam oil ratio (SOR) low, deficiency in economic performance; Especially for thick-layer heavy crude reservoir, because steam overlap causes oil reservoir bottom crude oil use rate lower, steam swept volume is limited, and ultimate recovery is lower.
Steam assisted gravity drainage techniques is that Canadian Bulter in 1978 invents, and has obtained successful Application at the heavy crude reservoir on the ground such as Liaohe Oil Field, Xinjiang Oilfield of Canadian oil-sand mining area, China.Its principle is steam injection in Injection Well, and steam forms vapor chamber in stratum, and upwards and sideways expansion, with the crude oil generation interchange of heat in oil reservoir, the crude oil after heating and steam condensate (SC) are let out output in horizontal production well below by Action of Gravity Field to vapor chamber.The recovery ratio of steam assisted gravity drainage techniques can reach 40%-60%, is applicable to exploit the heavy crude reservoir that thickness in monolayer is greater than 15m, but because vapor flow is far above liquid, therefore, steam is easily scurried into bottom producing well, causes horizontal segment development degree low.
Situ combustion technology refers to by inject air in oil reservoir, by spontaneous ignition or manual firing, air is reacted with crude oil generation high-temperature oxydation in oil reservoir and produce heat to reduce Crude viscosity.Mehsana oil field in Rumanian Suplacude Barcau oil field and India has obtained successful Application, in China Liaohe Oil Field, high 3, high 3-6-18 piece has also been carried out pilot test, due to combustion in situ implementing process complexity, need to and maintain high gas injection rate at ground down-firing, in addition, the regulation and control of fireflood live wire are more difficult, not yet form at present effective fireflood live wire leading edge control technique, in fireflood process, live wire is easily broken through producing well shaft bottom, cause serious potential safety hazard, therefore on-the-spot success rate is not high.
CN101004132A discloses a kind of exploitation technique for disgorging thick oil by pouring air to assistant steam, and it is to improve recovery ratio and project benefit by inject air in the process of steam soak and steam flooding.The method comprises following processing step: after drilling well, heavy oil tested layer carries out sleeve sand control completion, to suppress shaking out of later stage exploitation; In Completion Operations, build up artificial bottom of a well, the high pressure when bearing steam injection and pressure-air; Completion is injected vapours (more than 200 DEG C), increases reservoir temperature, reduces Viscosity of Heavy Crude Oil; After reservoir temperature raises, can be by same air Injection oil reservoir, then closing well, makes crude oil and the reaction of oxygen generation low-temperature oxidation emit heat and produce carbon dioxide and the gaseous mixture of nitrogen, increases displacement of reservoir oil energy; Oxidation reaction cleavable viscous crude changes oil component, increases crude oil fluidity and oil quality; Airborne oxygen can consume in most of oxidized reaction, does not produce the potential safety hazard that oil well oxygen causes; Air resource is abundant, can reduce costs.But the method has three subject matters: the one, and the method only provides the air injection auxiliary steam production practice of handling up, but it is a kind of pressure release production technique that relies on oil reservoir energy in essence that air injection auxiliary steam is handled up, be less than the Shallow Heavy Oil Reservoir of 500m for buried depth, because reservoir pressure energy is very low, therefore its recovery ratio is limited; The 2nd, although the method is suitable for the process of steam flooding, not mentioned which kind of technical measures of taking improve steam flooding heat utilization efficiency, reduce the key technical problems such as steam flooding heat waste; The 3rd, the air that does not have explanation how to control injection in air injection assisted steam flooding process avoids producing the security hidden trouble of oil gas and oxygen mixed gas ignition.
CN101403290A provides a kind of polymer gel displacement of reservoir oil to improve the method for extraction rate of ultra-thick oil.The processing step of the method comprises: first, by mixed with water crosslinking agent mother liquor, obtain pre-composition, mixed proportion is: crosslinking agent mother liquor: water=1: 1-1.2; Above-mentioned pre-composition is mixed mutually with polymer mother liquor, obtain polymer gel solution, mixed proportion is pre-composition: polymer mother liquor=1: 500-3000; The injection-gathering well head that above-mentioned polymer gel is injected to oil-feed field, the concentration of polymer gel is 1000ppm-7000ppm, injection pressure is 6MPa-10MPa.The method polymer gel displacement of reservoir oil, can improve the viscosity of injected water, thus effectively improve injected water and in-place oil mobility ratio, expand involving of injected water mention, improve oil recovery factor.But the method has three subject matters: the one, and because referring to stock tank oil viscosity, super viscous crude is greater than the crude oil of 50000 centipoises, the viscosity of polymer gel formula system is not announced in this patent application, open source information show (Hu Yong, Lu Xiangguo. the Al of waste water
3+cross-linked polymer gel performance characteristic [J]. oilfield chemistry, 2004,21 (4): 336-339): the viscosity of polymer gel formula system is no more than 50 centipoises conventionally, therefore the mobility ratio between this injection fluid and oil is more than 1000, and under high mobility ratio condition like this, crude oil swept volume and raising recovery ratio range value must be discussed; The 2nd, in the embodiment of this Patent Application Publication, not mentioned the method improves the effect of recovery ratio; The 3rd, polymer gel is trapped in oil reservoir will cause environment pollution.
CN101122225A provides a kind of fire flood method for vertical steam injection horizontal well production.The method is the compound well group hole pattern that adopts vertical steam injection and horizontal well production, i.e. 6 mouthfuls of vertical steam injection well steam injections, and two mouthfuls of producing wells recover the oil, or 9 mouthfuls of vertical steam injection well steam injections, and 3 mouthfuls of producing wells recover the oil.When drilling well, vertical steam injection well pierces steam injection above oil reservoir 1/2 thickness, horizontal well is positioned at the lower position of vertical group oil reservoir 1/2 thickness, utilize the top pressure extruding bottom crude oil producing after the vertical steam injection oil reservoir burning of top, and crude oil relies on deadweight to flow to net horizontal section from producing well extraction, the method has overcome and exists the inner preferential path of oil reservoir easily to form the drawback that oil reservoir horizontal direction vapour is altered, and can improve oil reservoir fireflood ultimate recovery 15%.But the same with the disclosed technical scheme of CN101004132A, the live wire leading edge explosion caused security hidden trouble at the bottom of producing well of advancing by leaps and bounds is evaded in the undeclared employing of method that this patent application proposes how control measure.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of note propane exploitation method for Shallow Heavy Oil Reservoir, utilize the horizontal well at oil reservoir middle part to inject continuously propane under higher than propane critical pressure condition, the horizontal well of oil reservoir bottom is produced continuously, utilize convection current diffusion and effect of mass transmitting between supercritical propane and former oil molecule, extract the lightweight in crude oil, middle matter and heavy component, realize crude oil upgrading and the object that increases substantially recovery ratio on the spot, it is high that the method has recovery ratio, propane reusable edible, cost of winning is low, good in economic efficiency, energy consumption is low, low emission is low, safety simple to operate, the features such as environmental protection.
For achieving the above object, the invention provides a kind of Shallow Heavy Oil Reservoir note propane exploitation method, comprise the following steps:
(1) horizontal flooding pattern is set in Shallow Heavy Oil Reservoir production zone, in same plane position (this plan-position refers to vertical plane position, Injection Well horizontal segment be positioned at producing well horizontal segment directly over) oil reservoir a pair of Injection Well and producing well are set;
(2) carry out steam injected cycle preheating by Injection Well and producing well simultaneously;
(3) reservoir temperature between the horizontal segment of Injection Well and the horizontal segment of producing well is elevated to after predetermined temperature, Injection Well and producing well stop cyclic preheat simultaneously, Injection Well starts to inject continuously propane, the injection rate of propane increases gradually with the expansion of vapor chamber, decline and reduce gradually with vapor chamber, usually, the injection rate of propane is 5000-25000m3/d;
(4) producing well starts to recover the oil and produce continuously.
The set-up mode of Injection Well and producing well can carry out according to the usual manner of this area, and Injection Well is horizontal Injection Well, and producing well is horizontal production well, and in oil reservoir, Injection Well and producing well have respectively one section of horizontal segment.A pair of Injection Well and the producing well injector-producer pair that partners.In the present invention, a horizontal flooding pattern comprises at least one pair of injector-producer pair.
In above-mentioned exploitation method provided by the invention, preferably, Shallow Heavy Oil Reservoir refers to the heavy crude reservoir of buried depth in 500m.
In above-mentioned exploitation method provided by the invention, preferably, in step (1), the horizontal segment of Injection Well is positioned at oil reservoir middle part, the horizontal segment of producing well is positioned at oil reservoir bottom and apart from bottom interface 1-2m, the vertical distance between the horizontal segment of Injection Well and the horizontal segment of producing well is 5-6m.
In above-mentioned exploitation method provided by the invention, preferably, in step (1), when core intersection less, reduce the well spacing well spacing between adjacent injector-producer pair in horizontal flooding pattern, when core intersection is larger, increase the well spacing well spacing between adjacent injector-producer pair.Usually, in the time that core intersection is 15-20m, the well spacing between the adjacent injector-producer pair of horizontal flooding pattern is 60-100m; In the time that core intersection is greater than 20m, the well spacing between the adjacent injector-producer pair of horizontal flooding pattern is 100-150m.
In above-mentioned exploitation method provided by the invention, preferably, in step (1), the tubing string of Injection Well and producing well all adopts the tubular column structure that hangs 7 inches of screen casings under 9 inches of (in) sleeve pipes.
In above-mentioned exploitation method provided by the invention, preferably, in the screen casing of Injection Well and producing well, be all lowered to parallel long oil pipe and short oil pipe, the diameter of long oil pipe is 3.5 inches, the diameter of short oil pipe is 2.375 inches, and long oil pipe is lowered into horizontal segment toe-end, short oil pipe is lowered into horizontal segment heel end.
In above-mentioned exploitation method provided by the invention, preferably, in step (2), Injection Well and producing well all adopt the vapor recycle preheating method of the steam injection of long oil pipe, the discharge opeing of short oil pipe, and, the highest steam injection rate need guarantee that the pressure reduction between toe-end and the heel end of horizontal segment annular space is no more than 0.05MPa, and minimum steam quality need guarantee that the steam quality of injecting annular space and arriving the short oil tube inlet of horizontal segment heel end from long oil pipe is greater than 0.Usually, between vapor recycle warming up period, steam injection rate can be controlled at 60-120 ton/sky.
In above-mentioned exploitation method provided by the invention, preferably, in step (2), in the time that time that vapor recycle preheating is carried out is in 60 days (usually, vapor recycle preheating time is 120-160 days, here 60 days with the time in the interior process that refers to vapor recycle preheating), the steam injection pressure of the long oil pipe in the annular space of the producing well horizontal segment of injector-producer pair equates with the steam injection pressure of the long oil pipe in the annular space of producing well horizontal segment, the discharge opeing pressure of the short oil pipe in the annular space of bottom producing well horizontal segment equates with the discharge opeing pressure of the short oil pipe in the annular space of top producing well horizontal segment.
In above-mentioned exploitation method provided by the invention, preferably, steam injection pressure and discharge opeing pressure all, than more than the high 0.5MPa of the critical pressure of propane (4.25MPa), are preferably 0.5-1.0MPa.
In above-mentioned exploitation method provided by the invention, preferably, in step (2), after the time of vapor recycle preheating reaches 60 days time, long oil pipe steam injection pressure in the annular space of producing well horizontal segment and the discharge opeing pressure of short oil pipe reduce simultaneously 0.3MPa (can by adjusting reduce steam injection amount speed reduce steam injection pressure and change change larger choke size reduce discharge opeing pressure), but all higher than the critical pressure of propane, and, inject into well the steam injection pressure of long oil pipe and the discharge opeing pressure of short oil pipe remains unchanged.Make to set up between the horizontal segment of Injection Well and the horizontal segment of producing well the pressure reduction of 0.3MPa, the heat transmission between can acceleration level section, improves crude oil fluidity.The steam injection pressure of producing well long oil pipe and Injection Well long oil pipe can be realized by adjusting steam injection rate, the discharge opeing pressure of producing well short oil pipe and Injection Well short oil pipe can regulate lifting rate by adjusting choke size, thereby realizes the object that regulates discharge opeing pressure.
In above-mentioned exploitation method provided by the invention, preferably, in step (3), predetermined temperature refers to that the reservoir temperature between Injection Well horizontal segment and producing well horizontal segment is elevated to more than 120 DEG C, reach after this predetermined temperature, the short oil pipe of Injection Well stops discharge opeing, and the short oil pipe of Injection Well and long oil pipe inject propane simultaneously continuously.
In above-mentioned exploitation method provided by the invention, preferably, in step (3), the injection pressure of Injection Well horizontal segment is higher than the critical pressure (4.25MPa) of propane; This can be realized by improving steam injection rate.
In above-mentioned exploitation method provided by the invention, preferably, in step (4), the long oil pipe of producing well stops steam injection, the short oil pipe of producing well and the long oil pipe production of recovering the oil continuously simultaneously, and the flowing bottomhole pressure (FBHP) of producing well horizontal segment is higher than the critical pressure (4.25MPa) of propane; Can realize by changing choke size, choke size is larger, and drain age velocity is higher, and the flowing bottomhole pressure (FBHP) of horizontal segment is lower.
In above-mentioned exploitation method provided by the invention, preferably, in step (4), injection production pressure difference between producing well horizontal segment and Injection Well horizontal segment (steam injection pressure and discharge opeing pressure poor) is no more than 0.5MPa; Horizontal segment steam injection pressure deducts horizontal segment discharge opeing pressure and equals injection production pressure difference, and steam injection pressure can be realized by adjusting injection rate, and discharge opeing pressure can be realized by adjusting choke size.
In above-mentioned exploitation method provided by the invention, preferably, in step (4), when crude output during without economic benefit (usually, by 75 dollars of/barrel of calculating of oil price, horizontal well day, the economic limit of produce oil was 2 tons/day, when lower than this limit, just can think and there is no economic benefit), Injection Well closing well, progressively by the production pressure decreased in the annular space of producing well horizontal segment to 0.6MPa, become gas phase after making propane lower than critical pressure and exploited out.
Shallow Heavy Oil Reservoir note propane exploitation method provided by the present invention has following technique effect:
(1) exploitation method provided by the present invention adopts the mode that turns low voltage difference warm-up cycle after steam injection equal-pressure-difference, can effectively heat the crude oil between injection-production well horizontal segment, promote the connection of fluid between horizontal segment, avoided that injection propane coldly adopts that initial stage crude oil flow resistance is large, be communicated with the problems such as difficulty between injection-production well horizontal segment, realized above fast produce, the zooming object in propane chamber;
(2) because vertical distance between injection-production well horizontal segment is about 5m, it is shorter that therefore cyclic preheat reaches predetermined temperature required time, and steam injection amount is limited, and ground boiler exhaust gas discharge value is little, and environmental pollution is little;
(3) injection pressure and production pressure are more than propane critical pressure 4.25MPa, make postcritical propane is the liquid phase that is lighter than viscous crude in oil reservoir, effectively avoid propane volatilization to produce has channeling, therefore can there is not has channeling risk in producing well, make producing well simple to operate, and compare in SAGD process, it is the key factor that affects horizontal segment development degree that the vapour of steam is altered;
(4) by convection current diffusion and effect of mass transmitting between propane and former oil molecule, effectively extract the lightweight of crude oil, middle matter and heavy component, thereby significantly reduce Crude viscosity, improve crude oil flow ability, realize crude oil upgrading on the spot, ultimate recovery can reach more than 85%, and except a small amount of asphaltene deposits is in reservoir rock surface, all the other components are all plucked out of;
(5) in process of production, arrive behind ground with the crude oil propane that together extraction comes, under the atmospheric pressure lower than critical pressure, become rapidly gas phase and depart from crude oil, therefore do not need complicated degasification technique; The propane spinning off is refilled oil reservoir, constantly recycles, and can realize the efficient utilization of propane, significantly reduces running cost;
(6) producing latter stage, by closing Injection Well, reduce producing well flowing bottomhole pressure (FBHP), formation pressure is reduced to below propane critical pressure, propane undergoes phase transition in oil reservoir becomes gas phase, there is violent expansion and by producing well extraction in volume, thereby has reduced to greatest extent the propane being detained in oil reservoir hole, reduced propane losses and cost of winning.
Relatively, with other the Technology of Heavy Oil Recovery, Shallow Heavy Oil Reservoir provided by the present invention is noted propane exploitation method and is also had following technical advantage:
(1) compare heavy crude reservoir and inject CO
2exploitation method, due to CO
2have stronger corrosiveness, high to tubing string and pipeline requirement, the facilities such as completion, production and ground all need anti-corrosion material, and cost is higher, and the present invention adopts the mode of injecting propane, and the corrosion-free effect of propane, requires lower to pipeline;
(2) inject the exploitation method of nitrogen at heavy crude reservoir, because nitrogen is non-condensation gas, cannot with crude oil mixed phase, under higher gas-liquid mobility ratio, easily there is has channeling in nitrogen, oil displacement efficiency and recovery ratio are lower, and the critical pressure of the propane that exploitation method provided by the present invention adopts is low, and with crude oil mixed phase completely, can realize the exploitation of low pressure mixed phase;
(3) in thick oil filling air low temperature method for oxidation, because the required reservoir temperature of crude oil low-temperature oxidation is more than 50 DEG C, therefore Shallow Heavy Oil Reservoir cannot be realized low-temperature oxidation reaction, air injection recovery ratio is limited, in addition, and when in the gas of output well head, oxygen content exceeds standard, there is explosion danger, therefore be not suitable for Shallow Heavy Oil Reservoir, and exploitation method provided by the present invention adopts the mode of note propane, its development effectiveness and recovery ratio are not subject to the restriction of reservoir temperature.
Brief description of the drawings
The schematic diagram of the horizontal flooding pattern that the note propane exploitation method that Fig. 1 provides for embodiment 1 adopts;
Fig. 2 a-Fig. 2 c is respectively the schematic diagram of liter, expansion and decline stage on propane chamber.
Main drawing reference numeral explanation:
Injection Well 1 producing well 2 output knockout drums 3
Oil water separator 4 propane compressor group 5 Injection Well sleeve pipes 6
Injection Well short oil pipe 7 Injection Well long oil pipe 8 Injection Well screen casings 9
Producing well sleeve pipe 10 producing well short oil pipe 11 producing well long oil pipes 12
Producing well screen casing 13 superstratum 14 oil reservoirs 15
Propane injects pipeline 16 producing well production fluid pipeline 17 oil water mixtures and transports pipeline 18
Dehydrated oil external transport pipeline 19 propane re-injection pipeline 20 injection well testing cables 21
22 producing well test cable 23 producing well test points 24 are put in injection well testing
25 propane chambeies 26, propane chamber
Detailed description of the invention
Understand for technical characterictic of the present invention, object and beneficial effect being had more clearly, existing technical scheme of the present invention is carried out to following detailed description, but can not be interpreted as restriction that can practical range of the present invention.
Embodiment 1
The present embodiment provides a kind of Shallow Heavy Oil Reservoir note propane exploitation method, and the major oil reservoir of this Shallow Heavy Oil Reservoir buries shallow, and average buried depth is 300m, and initial reservoir pressure is 2.8MPa, and the original reservoir temperature is 19 DEG C; Crude viscosity is high, and under reservoir temperature, degassed crude viscosity is 1,050,000 centipoises, effective pay thickiness average out to 15m.
The Shallow Heavy Oil Reservoir note propane exploitation method that the present embodiment provides comprises following concrete steps:
A, dispose horizontal flooding pattern
First at the interior deployment Injection Well of main force's heavy oil tested layer 15 (horizontal Injection Well) 1 and the producing well (horizontal Injection Well) 2 of this Shallow Heavy Oil Reservoir, Injection Well 1 and producing well 2 are positioned at same plane position, distance between this horizontal injector-producer pair and adjacent level injector-producer pair is 80m, and the top of oil reservoir 15 is superstratum 14;
Injection Well 1 is all lowered to producing well 2 intermediate casing that diameter is 9in, be respectively Injection Well sleeve pipe 6 and producing well sleeve pipe 10, below sleeve pipe, connect with screen pipe hanger the cutting seam sieve tube that diameter is 7in, be respectively the Injection Well screen casing 9 of Injection Well 1 horizontal segment and the producing well screen casing 13 of producing well 2 horizontal segments, the length of Injection Well screen casing 9 is 500m, the length of producing well screen casing 13 is 500m, producing well screen casing 13 is 1m with the distance on 15 end of oil reservoir circle, and the vertical distance between Injection Well screen casing 9 and producing well screen casing 13 is 5m;
In drilling process, be 5m in order to ensure the vertical distance between Injection Well screen casing 9 and producing well screen casing 13, utilize the accurate control well track of magnetic steering;
Injection Well 1 and the interior short oil pipe and the long oil pipe that are parallel to each other of being all lowered to of producing well 2, be respectively Injection Well short oil pipe 7, Injection Well long oil pipe 8, producing well short oil pipe 11 and producing well long oil pipe 12, short tubing diameter is 2.375in, long tubing diameter is 3.5in, short oil pipe is lowered to horizontal segment heel end, long oil pipe is lowered to horizontal segment toe-end, and short oil pipe and long oil pipe are coiled tubing;
In the annular space of the horizontal segment of horizontal Injection Well 1, be uniformly distributed 11 thermocouple temperature measurement points and pressure tap, Injection Well horizontal segment temperature (pressure) test point 22, is connected it by Injection Well horizontal segment test cable 21 with ground test device; In the annular space of the horizontal segment of horizontal production well 2, be uniformly distributed 11 thermocouple temperature measurement points and pressure tap, producing well horizontal segment temperature (pressure) test point 23, is connected it by producing well horizontal segment test cable 24 with ground test device;
Output knockout drum 3, oil water separator 4 and propane compressor group 5 are set on ground, wherein, output knockout drum 3 is connected with the well head of producing well 2 by producing well production fluid pipeline 17, output knockout drum 3 is connected with propane compressor group 5 by propane re-injection pipeline 20, output knockout drum 3 transports pipeline 18 by oil water mixture and is connected with oil water separator 4, oil water separator 4 is connected with dehydrated oil external transport pipeline 19, and propane compressor group 5 is injected pipeline 16 by propane and is connected with the well head of Injection Well 1.
The schematic diagram of above-mentioned horizontal flooding pattern as shown in Figure 1.
B, steam injected cycle preheating
By Injection Well long oil pipe 8 and the simultaneously continuous steam injection of producing well long oil pipe 12, well head steam quality is 80%, steam injection rate is 100 tons/day, shaft bottom steam injection pressure is 5.3MPa, by Injection Well short oil pipe 7 and producing well short oil pipe 11 continuous draining simultaneously, at the bottom of short oil pipe well, discharge opeing pressure is 5.2MPa, starts isobaric steam injected cycle preheating;
After cyclic preheat 60 days, the discharge opeing pressure of the steam injection pressure of Injection Well long oil pipe 8 and Injection Well short oil pipe 7 is constant, the shaft bottom steam injection pressure of producing well long oil pipe 12 drops to 5.0MPa (0.3MPa has declined), the shaft bottom discharge opeing pressure drop of producing well short oil pipe 11 is to 4.9MPa (0.3MPa has declined), start the preheating of low pressure steam injected cycle, the thermal communication accelerating between Injection Well screen casing 9 and producing well screen casing 13 is communicated with fluid;
When cyclic preheat reaches 150 days, the oil reservoir medium temperature between Injection Well screen casing 9 and producing well screen casing 13 rises to 120 DEG C, and Crude viscosity drops to below 100 centipoises; Producing well discharge opeing tables of data is bright, producing well short oil pipe 11 exudate moisture content have dropped to 85% from 100%, the amount that crude oil in oil reservoir flows into annular space from producing well screen casing 13 obviously increases, show that the Crude Oil fluid ability between injection-production well increases greatly, reach pre-heat effect, therefore Injection Well short oil pipe 7 stops discharge opeing, and producing well long oil pipe 12 stops steam injection, and steam injected cycle preheating finishes.
C, continuous note are adopted the stage
Injection Well short oil pipe 7 injects propane with Injection Well long oil pipe 8 simultaneously continuously, and bottomhole injection pressure is 5.3MPa, and higher than propane critical pressure 4.25MPa, propane injects oil reservoir 15 with liquid phase; Producing well short oil pipe 11 and producing well long oil pipe 12 continuous draining simultaneously, shaft bottom discharge opeing pressure is 4.8MPa, and higher than propane critical pressure 4.25MPa, the injection production pressure difference between Injection Well 1 horizontal segment and producing well 2 horizontal segments remains on 0.5MPa;
The ratio of the injection rate of the injection rate of Injection Well short oil pipe 7 and Injection Well long oil pipe 8 is 1: 2, and the ratio of the drain age velocity of the drain age velocity of producing well short oil pipe 11 and producing well long oil pipe 12 is 1: 2;
Under the prerequisite of guaranteeing pressure stability, injection rate is determined according to injection pressure, owing to just starting propane chamber, (formation in propane chamber and variation principle are in Injection Well, to inject the propane higher than critical pressure, because propane severe is much smaller than the severe of crude oil in oil reservoir, therefore propane is due to upwards onlap of gravitational differentiation, and its viscosity of crude oil that dissolves propane significantly reduces, fluid ability obviously improves, and flows into the producing well of oil reservoir bottom under gravitational differentiation.Constantly the propane of onlap forms propane chamber in stratum, under injection pressure and gravitational differentiation double action, propane chamber upwards and sideways expansion, with the crude oil generation mass exchange in oil reservoir; In the time that the power extending transversely in propane chamber is less than propane self gravitation, propane chamber starts to decline, at the bottom of finally dropping to producing well) less, drainage area is less, and therefore propane injection rate is lower, is only 100 tons/day, along with continuous convection current diffusion and mass transfer between propane and former oil molecule, lightweight in crude oil, middle matter, heavy component are constantly extracted becomes the oil of high fluidity stream, and under crude oil Action of Gravity Field, the crude oil of high fluidity enters the producing well of oil reservoir bottom and is plucked out of.Because propane molecular mass and density are all low than viscous crude, therefore, as shown in Fig. 2 a-Fig. 2 c (this three width figure is schematic cross-section), it rises on propane chamber, the schematic diagram of expansion and decline stage, the grey color part in 26 outsides, propane chamber represents stratum, propane chamber 26 starts longitudinally to rise under density contrast and gravitational differentiation, when propane chamber 26 longitudinally rises to behind top of oil horizon, start extending transversely, along with the continuous expansion in propane chamber 26, the injection rate of propane improves constantly, under this reservoir condition, utilize this injector-producer pair casing programme, Injection Well 1 the highest injection rate has reached 350 tons/day, the drain age velocity of producing well 2 is subject to producing well 2 flowing bottomhole pressure (FBHP) controls, the highest drain age velocity has reached 380 tons/day.
In recovery process, enter producing well 2 and entered ground output knockout drum 3 by the propane of together extraction, because the pressure in output knockout drum 3 is 1 atmospheric pressure, lower than propane critical pressure, therefore propane undergoes phase transition rapidly rear volatilization becomes gas and separates with crude oil, the propane gas of separating enters propane compressor group 5 via propane re-injection pipeline 20, propane compressor group 5 is injected pipeline 16 by the propane of back production via propane and is refilled oil reservoir 15 from Injection Well short oil pipe 7 and Injection Well long oil pipe 8 respectively, and transporting pipeline 18 via oil water mixture, the oil water mixture that has separated propane enters oil water separator 4, carry out after further separating and dehydrating outer defeated by dehydrated oil external transport pipeline 19.
D, production ending phase
The propane chamber right with adjacent well to 40m place extending transversely, propane chamber is crossing, and propane chamber starts to decline gradually under propane and crude oil gravity and drainage direction effect afterwards, and the injection rate of propane and crude output all start to enter depletion stage; Near propane chamber drops to producing well screen casing 13 time, daily oil production drops to about 2 tons/day, the percent by volume of the propane in production fluid reaches more than 90%, show that this well is plucked out of substantially to the crude oil control reserves in the oil reservoir of place, recovery ratio reaches more than 85%, and injector-producer pair has entered production ending phase.
In order to increase economic efficiency, need extraction propane as far as possible, reduce the delay of propane in oil reservoir hole, because producing well 2 bottom pressures are controlled at 4.8MPa, the propane in oil reservoir is in a liquid state, and under this pressure condition, its specific volume is 0.0044m
3/ kg, in the time that producing well 2 flowing bottomhole pressure (FBHP)s drop to 0.6MPa, propane evaporates into gaseous state, and its specific volume is 0.079m
3/ kg, during than 4.25MPa volume expansion 17 times, therefore, producing well 2 flowing bottomhole pressure (FBHP)s drop to after 0.6MPa, propane volume liquid in oil reservoir hole and propane chamber will acutely expand, and the propane gas quality of being detained in unit voids volume in oil reservoir greatly reduces, and a large amount of propane is plucked out of.For this reason, in production ending phase, take to reduce the strategy of producing well flowing bottomhole pressure (FBHP), producing well flowing bottomhole pressure (FBHP) is dropped to 0.6MPa, make propane change gas phase into from liquid phase, realize highly recovery, result of calculation shows, propane recovery reaches 92%.
Table 1 is production and the economic benefit situation statistics of the present embodiment.As shown in table 1, from the condition of production, after employing horizontal well steam soak, turn the development scheme of steam flooding, the economical and effective production time is about 8.5 years, and cumulative oil production is about 7.55 × 10
4t, ultimate recovery is about 43.1%, is 9 years and adopt the economical and effective production time of the present embodiment supplying method, and cumulative oil production is 15.24 × 10
4t, ultimate recovery is 87.0%, has increased substantially 43.9 percentage points than the former.From economic efficiency contrast, with 50 dollars of/barrel of calculating of oil price, adopt the development scheme that turns steam flooding after horizontal well steam soak because needs inject a large amount of steam continuously, it is higher that ground boiler produces steam cost, producing steam cost per ton is at present 14 yuan, and therefore produce oil cost is higher, and financial net present value NPV is 6,189 ten thousand yuan, internal rate of return irr is 23%, needs to recoup capital outlay for 3.2 years; And adopt the exploitation method of the present embodiment, and due to the whole re-injections of output propane, final propane recovery reaches 92%, only has 8% propane to be trapped in oil reservoir, and therefore cost of winning is well below steam injection cost; Meanwhile, the method injection mode of the present embodiment is simple, and operating cost greatly reduces, and therefore the final financial net present value NPV of the method for the present embodiment has reached 24,477 ten thousand yuan, and internal rate of return irr reaches 97%, 1.5 year and can recoup capital outlay.
Table 1
Embodiment 2
The present embodiment provides a kind of Shallow Heavy Oil Reservoir note propane exploitation method, this Shallow Heavy Oil Reservoir is the oil reservoir of shallow layer thick oil oil district, Xinjiang Oilfield wind city Ba Dao gulf group, the average buried depth of major oil reservoir in this viscous crude oil district is 220m, effective pay thickiness average out to 17m, initial reservoir pressure is 2.0MPa, the original reservoir temperature is 17 DEG C, and under reservoir temperature, degassed crude viscosity is 870,000 centipoises.
The Shallow Heavy Oil Reservoir note propane exploitation method that the present embodiment provides comprises following concrete steps:
A, deployment horizontal well
First at the interior deployment Injection Well of main force's heavy oil tested layer 15 (horizontal Injection Well) 1 and the producing well (horizontal Injection Well) 2 of this Shallow Heavy Oil Reservoir, Injection Well 1 and producing well 2 are positioned at same plane position, distance between this horizontal injector-producer pair and adjacent level injector-producer pair is 80m, and the top of oil reservoir 15 is superstratum 14;
Injection Well 1 is all lowered to producing well 2 intermediate casing that diameter is 9in, be respectively Injection Well sleeve pipe 6 and producing well sleeve pipe 10, below sleeve pipe, connect with screen pipe hanger the cutting seam sieve tube that diameter is 7in, be respectively the Injection Well screen casing 9 of Injection Well 1 horizontal segment and the producing well screen casing 13 of producing well 2 horizontal segments, the length of Injection Well screen casing 9 is 500m, the length of producing well screen casing 13 is 500m, producing well screen casing 13 is 1m with the distance on 15 end of oil reservoir circle, and the vertical distance between Injection Well screen casing 9 and producing well screen casing 13 is 5m;
In drilling process, be 5m in order to ensure the vertical distance between Injection Well screen casing 9 and producing well screen casing 13, utilize the accurate control well track of magnetic steering;
Injection Well 1 and the interior short oil pipe and the long oil pipe that are parallel to each other of being all lowered to of producing well 2, be respectively Injection Well short oil pipe 7, Injection Well long oil pipe 8, producing well short oil pipe 11 and producing well long oil pipe 12, short tubing diameter is 2.375in, long tubing diameter is 3.5in, short oil pipe is lowered to horizontal segment heel end, long oil pipe is lowered to horizontal segment toe-end, and the type of short oil pipe and long oil pipe is coiled tubing;
In the annular space of the horizontal segment of horizontal Injection Well 1, be uniformly distributed 11 thermocouple temperature measurement points and pressure tap, Injection Well horizontal segment temperature (pressure) test point 22, is connected it by Injection Well horizontal segment test cable 21 with ground test device; In the annular space of the horizontal segment of horizontal production well 2, be uniformly distributed 11 thermocouple temperature measurement points and pressure tap, producing well horizontal segment temperature (pressure) test point 23, is connected it by producing well horizontal segment test cable 24 with ground test device;
Output knockout drum 3, oil water separator 4 and propane compressor group 5 are set on ground, wherein, output knockout drum 3 is connected with the well head of producing well 2 by producing well production fluid pipeline 17, output knockout drum 3 is connected with propane compressor group 5 by propane re-injection pipeline 20, output knockout drum 3 transports pipeline 18 by oil water mixture and is connected with oil water separator 4, oil water separator 4 is connected with dehydrated oil external transport pipeline 19, and propane compressor group 5 is injected pipeline 16 by propane and is connected with the well head of Injection Well 1.
The schematic diagram of above-mentioned horizontal flooding pattern as shown in Figure 1.
B, steam injected cycle pipeline start up by preheating
By Injection Well long oil pipe 8 and the simultaneously continuous steam injection of producing well long oil pipe 12, well head steam quality is 75%, steam injection rate is 100 tons/day, shaft bottom steam injection pressure is 5.3MPa, by Injection Well short oil pipe 7 and producing well short oil pipe 11 continuous draining simultaneously, at the bottom of short oil pipe well, discharge opeing pressure is 5.2MPa, starts isobaric steam injected cycle preheating;
After cyclic preheat 60 days, the discharge opeing pressure of the steam injection pressure of Injection Well long oil pipe 8 and Injection Well short oil pipe 7 is constant, the shaft bottom steam injection pressure of producing well long oil pipe 12 drops to 5.0MPa (0.3MPa has declined), the shaft bottom discharge opeing pressure drop of producing well short oil pipe 11 is to 4.9MPa (0.3MPa has declined), start the preheating of low pressure steam injected cycle, the thermal communication accelerating between Injection Well screen casing 9 and producing well screen casing 13 is communicated with fluid;
When cyclic preheat reaches 130 days, the oil reservoir medium temperature between Injection Well screen casing 9 and producing well screen casing 13 rises to 120 DEG C, and Crude viscosity drops to below 100 centipoises; Producing well discharge opeing tables of data is bright, producing well short oil pipe 11 exudate moisture content have dropped to 87% from 100%, the amount that crude oil in oil reservoir flows into annular space from producing well screen casing 13 obviously increases, show that the Crude Oil fluid ability between injection-production well increases greatly, reach pre-heat effect, therefore Injection Well short oil pipe 7 stops discharge opeing, and producing well long oil pipe 12 stops steam injection, and steam injected cycle preheating finishes.
C, continuous note are adopted the stage
Injection Well short oil pipe 7 injects propane with Injection Well long oil pipe 8 simultaneously continuously, and bottomhole injection pressure is 5.3MPa, and higher than propane critical pressure 4.25MPa, propane injects oil reservoir 15 with liquid phase; Producing well short oil pipe 11 and producing well long oil pipe 12 continuous draining simultaneously, shaft bottom discharge opeing pressure is 4.8MPa, and higher than propane critical pressure 4.25MPa, the injection production pressure difference between Injection Well 1 horizontal segment and producing well 2 horizontal segments remains on 0.5MPa;
The ratio of the injection rate of the injection rate of Injection Well short oil pipe 7 and Injection Well long oil pipe 8 is 1: 2, and the ratio of the drain age velocity of the drain age velocity of producing well short oil pipe 11 and producing well long oil pipe 12 is 1: 2;
Under the prerequisite of guaranteeing pressure stability, injection rate is determined according to injection pressure, along with the continuous expansion in propane chamber, the injection rate of propane improves constantly, under this reservoir condition, utilize this injector-producer pair casing programme, Injection Well 1 the highest injection rate has reached 390 tons/day, and the drain age velocity of producing well 2 is subject to producing well 2 flowing bottomhole pressure (FBHP) controls, and the highest drain age velocity has reached 410 tons/day;
In recovery process, enter producing well 2 and entered ground output knockout drum 3 by the propane of together extraction, the propane gas of separating enters propane compressor group 5 via propane re-injection pipeline 20, propane compressor group 5 is injected pipeline 16 by the propane of back production via propane and is refilled oil reservoir 15 from Injection Well short oil pipe 7 and Injection Well long oil pipe 8 respectively, and the oil water mixture that has separated propane transports pipeline 18 via oil water mixture and enters oil water separator 4, carry out after further separating and dehydrating outer defeated by dehydrated oil external transport pipeline 19.
D, production ending phase
The propane chamber right with adjacent well to 50m place extending transversely, propane chamber is crossing, and propane chamber starts to decline gradually under propane and crude oil gravity and drainage direction effect afterwards, and the injection rate of propane and crude output all start to enter depletion stage; Near propane chamber drops to producing well screen casing 13 time, daily oil production drops to about 2 tons/day, in production fluid, the percent by volume of propane reaches more than 90%, show that this well is plucked out of substantially to the crude oil control reserves in the oil reservoir of place, recovery ratio reaches more than 87%, and injector-producer pair has entered production ending phase.
In order to increase economic efficiency, need extraction propane as far as possible, reduce the delay of propane in oil reservoir hole, in production ending phase, take to reduce the strategy of producing well flowing bottomhole pressure (FBHP), producing well flowing bottomhole pressure (FBHP) is dropped to 0.6MPa, make propane, from liquid phase changes gas phase into, volume expansion occur and be plucked out of the ground, realize highly recovery, result of calculation shows, propane recovery reaches 93%.
Table 2 is production and the economic benefit situation statistics of the present embodiment.As shown in table 2, from the condition of production, after employing horizontal well steam soak, turn the development scheme of steam flooding, the economical and effective production time is about 9.9 years, and cumulative oil production is about 10.24 × 10
4t, ultimate recovery is about 41.3%, and the method economical and effective production time of the present embodiment is about 11 years, cumulative oil production is about 21.98 × 10
4t, ultimate recovery is about 88.6%, has increased substantially 44.7 percentage points than the former.From economic efficiency contrast, with 50 dollars of/barrel of calculating of oil price, adopt the development scheme that turns steam flooding after horizontal well steam soak because needs inject a large amount of steam continuously, it is higher that ground boiler produces steam cost, producing steam cost per ton is at present 14 yuan, and therefore produce oil cost is higher, and financial net present value NPV is 8,814 ten thousand yuan, internal rate of return irr is 21%, needs to recoup capital outlay for 2.9 years; And adopt the exploitation method of the present embodiment, and due to the whole re-injections of output propane, final propane recovery reaches 93%, only has 7% propane to be trapped in oil reservoir, and therefore cost of winning is well below steam injection cost; Meanwhile, the exploitation method injection mode of the present embodiment is simple, and operating cost greatly reduces, and therefore the final financial net present value NPV of the exploitation method of the present embodiment has reached 37,067 ten thousand yuan, and internal rate of return irr reaches 99%, 1.4 year and can recoup capital outlay.
Table 2
Therefore, from manufacturing process, the exploitation method low operation cost of the present embodiment, from production effect, the oil recovery factor that the exploitation method of the present embodiment obtains turns the recovery ratio of steam flooding far away higher than steam soak, from economic benefit, the exploitation method of the present embodiment is because of the advantage of its low energy consumption low emission, can obtain good economic benefit, there is the very strong ability to ward off risks.
Claims (15)
1. a Shallow Heavy Oil Reservoir note propane exploitation method, it comprises the following steps:
(1) horizontal flooding pattern is set in Shallow Heavy Oil Reservoir production zone, a bite Injection Well and a bite producing well are set in the oil reservoir of same vertical plane position, form an injector-producer pair, described Injection Well is horizontal Injection Well, described producing well is horizontal production well, and this horizontal flooding pattern comprises at least one pair of injector-producer pair;
(2) carry out steam injected cycle preheating by Injection Well and producing well simultaneously;
Described Injection Well and described producing well all adopt the vapor recycle preheating method of the steam injection of long oil pipe, the discharge opeing of short oil pipe, and, the highest steam injection rate need guarantee that the pressure reduction between toe-end and the heel end of annular space of horizontal segment is no more than 0.05MPa, and minimum steam quality need guarantee that the steam quality of injecting annular space and arriving the short oil tube inlet of horizontal segment heel end from long oil pipe is greater than 0;
In the time that time that vapor recycle preheating is carried out is in 60 days, long oil pipe steam injection pressure in the producing well horizontal segment annular space of described injector-producer pair equates with the long oil pipe steam injection pressure in Injection Well horizontal segment annular space, and the discharge opeing pressure of the short oil pipe in producing well horizontal segment annular space equates with the discharge opeing pressure of the short oil pipe in Injection Well horizontal segment annular space;
Described steam injection pressure and described discharge opeing pressure are all than the high 0.5-1.0MPa of the critical pressure of propane;
After the time of vapor recycle preheating reaches 60 days time, the steam injection pressure of the long oil pipe in the annular space of bottom producing well horizontal segment and the discharge opeing pressure of short oil pipe reduce 0.3MPa simultaneously, but all higher than the critical pressure of propane, and top injects into well the steam injection pressure of long oil pipe and the discharge opeing pressure of short oil pipe remains unchanged;
(3) reservoir temperature between the horizontal segment of Injection Well and the horizontal segment of producing well is elevated to after predetermined temperature, and Injection Well and producing well stop cyclic preheat simultaneously, and Injection Well starts to inject continuously propane, and the injection rate of propane is 5000-25000m
3/ d;
(4) producing well starts to recover the oil and produce continuously.
2. exploitation method as claimed in claim 1, wherein, described Shallow Heavy Oil Reservoir refers to the heavy crude reservoir of buried depth in 500m.
3. exploitation method as claimed in claim 1, wherein, in described step (1), the horizontal segment of described Injection Well is positioned at oil reservoir middle part, the horizontal segment of described producing well is positioned at oil reservoir bottom and apart from bottom interface 1-2m, the vertical distance between the horizontal segment of described Injection Well and the horizontal segment of described producing well is 5-6m.
4. exploitation method as claimed in claim 1, wherein, in described step (1), in the time that core intersection is 15-20m, the well spacing between the adjacent injector-producer pair of described horizontal flooding pattern is 60-100m; In the time that core intersection is greater than 20m, the well spacing between the adjacent injector-producer pair of described horizontal flooding pattern is 100-150m.
5. exploitation method as claimed in claim 1, wherein, in described step (1), the tubing string of described Injection Well and described producing well all adopts the tubular column structure that hangs 7 inches of screen casings under 9 inches of sleeve pipes.
6. exploitation method as claimed in claim 5, wherein, in the screen casing of described Injection Well and described producing well, be all lowered to parallel long oil pipe and short oil pipe, the diameter of long oil pipe is 3.5 inches, the diameter of short oil pipe is 2.375 inches, and described long oil pipe is lowered into horizontal segment toe-end, described short oil pipe is lowered into horizontal segment heel end.
7. the exploitation method as described in claim 1 or 6, wherein, in described step (3), predetermined temperature refers to that the reservoir temperature between Injection Well horizontal segment and producing well horizontal segment is elevated to more than 120 DEG C, reach after this predetermined temperature, the short oil pipe of Injection Well stops discharge opeing, and the short oil pipe of Injection Well and long oil pipe inject propane simultaneously continuously.
8. exploitation method as claimed in claim 1, wherein, in described step (3), the injection pressure of Injection Well horizontal segment is higher than the critical pressure of propane.
9. exploitation method as claimed in claim 1, wherein, in described step (4), the long oil pipe of producing well stops steam injection, the short oil pipe of producing well and the long oil pipe production of recovering the oil continuously simultaneously, and the flowing bottomhole pressure (FBHP) of producing well horizontal segment is higher than the critical pressure of propane.
10. exploitation method as claimed in claim 1, wherein, in described step (4), the injection production pressure difference between producing well horizontal segment and Injection Well horizontal segment is no more than 0.5MPa.
11. exploitation methods as claimed in claim 1, wherein, in described step (4), when crude output is during without economic benefit, Injection Well closing well, progressively by the production pressure decreased in the annular space of producing well horizontal segment to 0.6MPa, become gas phase after making propane lower than critical pressure and exploited out.
12. exploitation methods as claimed in claim 7, wherein, in described step (3), the injection pressure of Injection Well horizontal segment is higher than the critical pressure of propane.
13. exploitation methods as claimed in claim 7, wherein, in described step (4), the long oil pipe of producing well stops steam injection, the short oil pipe of producing well and the long oil pipe production of recovering the oil continuously simultaneously, and the flowing bottomhole pressure (FBHP) of producing well horizontal segment is higher than the critical pressure of propane.
14. exploitation methods as claimed in claim 7, wherein, in described step (4), the injection production pressure difference between producing well horizontal segment and Injection Well horizontal segment is no more than 0.5MPa.
15. exploitation methods as claimed in claim 7, wherein, in described step (4), when crude output is during without economic benefit, Injection Well closing well, progressively by the production pressure decreased in the annular space of producing well horizontal segment to 0.6MPa, become gas phase after making propane lower than critical pressure and exploited out.
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| CN106930741B (en) * | 2017-05-17 | 2019-03-12 | 中国石油大学(华东) | A kind of method and apparatus for exploiting thick-layer heavy crude reservoir |
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