CN113622882A - Air injection oil extraction equipment and oil extraction method for ancient buried hill oil reservoir - Google Patents
Air injection oil extraction equipment and oil extraction method for ancient buried hill oil reservoir Download PDFInfo
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- CN113622882A CN113622882A CN202111038701.0A CN202111038701A CN113622882A CN 113622882 A CN113622882 A CN 113622882A CN 202111038701 A CN202111038701 A CN 202111038701A CN 113622882 A CN113622882 A CN 113622882A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
Abstract
The invention discloses an air injection oil extraction device and an oil extraction method for an ancient buried hill oil reservoir, which relate to the technical field of crude oil extraction, and the air injection oil extraction method for the ancient buried hill oil reservoir comprises the following steps: removing nitrogen from air, and injecting the separated nitrogen into an area above a gas layer distribution zone in the ancient buried hill oil reservoir; the nitrogen-enriched mixed gas obtained after air nitrogen removal is heated and injected into the lower area of the gas layer distribution zone of the oil reservoir in the ancient buried hill, the nitrogen obtained after air nitrogen removal is directly and synchronously injected into the upper area of the gas layer distribution zone to form a gas cap to realize coordination and oil displacement, the nitrogen is more stable than air in property, the safety of gas injection construction operation is improved, the density of the further nitrogen is less than that of the oxygen-enriched mixed gas obtained after air nitrogen removal, the nitrogen is stably positioned in the upper area of the gas layer distribution zone and is pressurized, so that the high-temperature oxygen-enriched mixed gas is positioned in the lower area of the gas layer distribution zone, the heating effect is improved, the high-temperature hot air demand is obviously reduced during injection and production construction, and the oil extraction cost is reduced.
Description
Technical Field
The invention relates to the technical field of crude oil exploitation, in particular to an air injection oil extraction device and an oil extraction method for an ancient buried hill oil reservoir.
Background
As is known, the ancient buried hill is formed by that the ancient terrain protuberance which is subjected to weathering and denudation for a long time is covered by an impermeable rock stratum, and oil gas is gathered in the ancient buried hill, an oil source is from the exterior of the ancient buried hill, and a 'buried hill' reservoir body which is composed of different rocks is subjected to weathering, leaching and corrosion through structural fracture, physical weathering and chemical weathering to form a seam network crack system with good permeability to be a space for gathering the oil gas, and oil supply channels such as unconformity surfaces and fault surfaces are not integrated, so that the ancient buried hill oil gas reservoir is a necessary condition for forming the ancient buried hill oil gas reservoir, and the oil gas reservoir is distributed in a block shape and is not controlled by a horizon. The buried-denudation protruding oil-gas reservoir is also called a latent-denudation protruding oil-gas reservoir, an oil layer distribution zone is arranged above the bottom water of the ancient buried-mountain oil reservoir, and a gas layer distribution zone is arranged at the upper part of the oil layer.
For example, in the patent of the invention in China with an authorization notice number of CN100398779C and a name of 'an ancient buried hill oil reservoir air injection oil extraction method', the oil extraction method specifically comprises the following steps: selecting and determining the oil storage physical properties of the ancient buried hill, and selecting and determining a well position; injecting hot air of 350 ℃ into the determined water-containing well section in the oil well, and forcing an oil-water interface in the early stage in the ancient buried hill, which is raised by the bottom water of the produced crude oil, to move downwards for a certain distance to a newly produced oil-water interface after gas injection, namely the position of a balance interface; and (5) mining the ancient buried hill oil reservoir.
If the publication number is CN106223911B, the name is 'oil displacement method for injecting strong high-pressure air and oxygen to deep ancient buried hill oil deposit', the oil displacement method is concretely: performing strong high-pressure gas injection through a gas injection well, and injecting 3-5 ten thousand square of air into the stratum; the method is characterized in that nitrogen is removed through air, oxygen-rich mixed gas is separated out, the oxygen-rich mixed gas is injected into an oil layer in a 3-5-ten thousand standard square mode, the temperature of the original stratum of the ancient buried hill oil reservoir is higher (120-300) DEG C, injected oxygen can rapidly carry out cracking reaction with crude oil, therefore, the injected gas does not need to be heated, the oxygen-rich mixed gas is separated out through air nitrogen removal and injected into the stratum for ignition, the oxidative cracking reaction time is shortened, rapid oxidative cracking is realized, explosion prevention and corrosion prevention can be effectively realized, and safe operation is guaranteed to the maximum extent.
In the gas layer distribution zone of the ancient buried hill oil reservoir, no crude oil exists in cracks and pores in the area above the gas layer distribution zone, so that only gas injection is needed to form driving during gas injection exploitation, but the prior oil extraction method of the ancient buried hill oil reservoir by injecting air is the same as the method for injecting air into the ancient buried hill oil reservoir to form oil extraction by injecting heated high-temperature hot air directly and continuously, which causes huge demand of high-temperature hot air and serious increase of oil extraction cost, and simultaneously the method for injecting hot gas into the gas layer distribution zone by floating up and sinking down by cold air causes poor heating effect of the gas layer distribution zone close to the oil layer, which is unfavorable for improving the fluidity of crude oil and extracting oil, and simultaneously, the method for injecting strong high-pressure air into the deep ancient buried hill oil reservoir and displacing oil by floating up and sinking down by cold air is the same as the method for injecting hot gas into the deep ancient buried hill oil reservoir by injecting strong high-pressure air and floating up and sinking down, so as to reduce the time of oxidative cracking reaction and realize rapid oxidative cracking, through removing the nitrogen to the air in order to realize letting in oxygen boosting mist, but directly arrange outward to the nitrogen gas that the air denitrogenation obtained and cause nitrogen gas extravagant, then carry out strong high-pressure air injection, along with strong high-pressure air's continuous injection drive oil, then directly inject the air because oxygen content is higher in the air, stability is relatively poor, and oil reservoir ambient temperature is higher, and then if meet oil pipe and rock the friction and easily cause the incident.
Disclosure of Invention
The invention aims to provide an air injection oil extraction device and an oil extraction method for an ancient buried hill oil reservoir, so as to solve the defects in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme: an air injection oil extraction method for an ancient buried hill oil reservoir comprises the following steps:
s1: removing nitrogen from air, and injecting the separated nitrogen into an area above a gas layer distribution zone in the ancient buried hill oil reservoir;
s2: and heating the oxygen-enriched mixed gas obtained after the air is denitrified and injecting the oxygen-enriched mixed gas into the lower area of the gas layer distribution zone of the ancient buried hill oil reservoir.
As a further description of the above technical solution: before the step S1, the method further includes:
according to the total well planning number, arranging an injection-production well pattern in an ancient buried hill oil reservoir exploitation area;
and combining a gas injection oil extraction pipe bundle to the middle lower part of the injection and production well pattern, wherein the combined gas injection oil extraction pipe bundle is provided with a first gas injection channel, a second gas injection channel and an oil extraction pipeline.
As a further description of the above technical solution: the step S2 is followed by: the high pressure gas injected from step S1 and step S2 pushes the zone of the reservoir to flow and to produce the crude oil through the production channel.
As a further description of the above technical solution: injecting nitrogen into the upper area of the gas layer distribution zone of the ancient buried hill oil reservoir in the step S1, and injecting gas through the first gas injection channel in the combined gas injection oil extraction pipe bundle;
and in the step S2, injecting high-temperature oxygen-enriched mixed gas into the lower area of the gas layer distribution zone of the ancient buried hill oil reservoir, and injecting gas through the second gas injection channel of the combined gas injection oil extraction tube bundle.
As a further description of the above technical solution: the oil extraction channel is an oil extraction channel in the combined gas injection oil extraction pipe bundle.
As a further description of the above technical solution: an ancient buried hill oil reservoir air injection oil recovery device, includes combination gas injection oil recovery tube bank, combination gas injection oil recovery tube bank includes:
the first gas injection channel is used for injecting nitrogen separated by removing nitrogen from air into an area above a gas layer distribution zone in the ancient buried hill oil reservoir;
and the second gas injection channel is used for injecting the oxygen-enriched mixed gas obtained after the air is denitrified into the lower area of the gas layer distribution zone of the ancient buried hill oil reservoir through heating.
As a further description of the above technical solution: the combined gas injection oil extraction pipe bundle comprises a sleeve, a core pipe penetrates through the sleeve, an oil extraction pipeline penetrates through the inside of the core pipe, a first gas injection channel is formed between the sleeve and the core pipe, and a second gas injection channel is formed between the core pipe and the oil extraction pipeline.
As a further description of the above technical solution: the bottom end of the sleeve is fixedly sleeved with a first gas injection joint, and the bottom end of the core pipe is fixedly sleeved with a second gas injection joint.
As a further description of the above technical solution: the oil extraction device is characterized in that an oil extraction hole is formed in the bottom end of the oil extraction pipeline, a gas channeling prevention mechanism is movably sleeved at the bottom end of the oil extraction pipeline and comprises an oil support, a plugging assembly and a driving unit, the oil support is movably sleeved on the oil extraction pipeline, the plugging assembly is movably arranged on the inner side of the oil extraction pipeline so as to plug an oil extraction hole in the outer area of the oil support on the oil extraction pipeline, and the driving unit is used for synchronously driving the oil support and lifting and adjusting the plugging assembly.
As a further description of the above technical solution: the plugging component comprises a plugging pipe, and a strip-shaped through hole matched with the oil extraction hole is formed in the middle section of the plugging pipe.
In the technical scheme, the air injection oil extraction method for the ancient buried hill oil reservoir provided by the invention comprises the steps of heating the oxygen-enriched mixed gas obtained after air is denitrified and injecting the oxygen-enriched mixed gas into the lower area of a gas layer distribution zone in the ancient buried hill oil reservoir (namely the gas layer distribution zone area close to an oil layer), so that the high-temperature oxygen-enriched mixed gas and the crude oil in the cracks and pores of the gas layer distribution zone area close to the oil layer are subjected to oxidative cracking reaction, and the driving force of the flow of the crude oil is increased; meanwhile, the rock expands when heated, so that the volume of a rock gap is reduced, and the fluidity of the crude oil is improved;
secondly, crude oil does not exist in cracks and pores in the area above the gas layer distribution zone, high-temperature gas does not need to be introduced, nitrogen obtained after air is denitrified is directly and synchronously injected above the gas layer distribution zone, so that gas cap formation is realized to realize coordination for oil displacement, the separated nitrogen is used in coordination, waste caused by direct discharge of the separated nitrogen is avoided, the nitrogen property is more stable compared with air, the safety of gas injection construction operation is improved, the density of the further nitrogen is less than that of the oxygen-enriched mixed gas obtained after air is denitrified, the nitrogen is stably positioned in the area above the gas layer distribution zone and is pressurized to enable the high-temperature oxygen-enriched mixed gas to be positioned in the area below the gas layer distribution zone, the heating effect is improved, meanwhile, the nitrogen obtained after separation is directly introduced into the area above the gas layer distribution zone, and the demand of high-temperature hot air is obviously reduced during injection and production construction, the oil extraction cost is reduced.
Because the air injection oil extraction method for the ancient buried hill oil reservoir has the beneficial effects, the air injection oil extraction equipment for the ancient buried hill oil reservoir for realizing the oil extraction method also has the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a flow chart of an oil recovery method by injecting air into an ancient buried hill reservoir according to an embodiment of the present invention;
FIG. 2 is a schematic construction diagram of an oil recovery method by injecting air into an ancient buried hill oil reservoir according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a combined gas injection production tube bundle provided in accordance with an embodiment of the present invention;
fig. 4 is a schematic structural view of a gas channeling prevention mechanism provided by the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a driving unit according to an embodiment of the present invention;
fig. 6 is a sectional view of a gas channeling prevention mechanism provided by the embodiment of the present invention;
fig. 7 is a schematic view of a connection structure between the plugging assembly and the driving unit according to an embodiment of the present invention.
Description of reference numerals:
1. a gas layer distribution zone; 11. an upper region; 12. a lower region; 2. an oil layer distribution zone; 3. a bottom water distribution zone; 10. combining a gas injection oil extraction pipe bundle; 101. a sleeve; 1011. a first gas injection fitting; 1012. a first air intake joint; 102. a core tube; 1021. a second gas injection joint; 1022. a second air inlet joint; 103. an oil extraction pipeline; 1031. an oil extraction hole; 20. an air nitrogen removal system; 30. a heating system; 40. a gas channeling prevention mechanism; 41. an oil support; 42. a plugging component; 421. plugging the pipe; 422. a strip-shaped through hole; 423. connecting a nut seat; 43. a drive unit; 431. a driving fluted disc; 432. a first drive gear; 433. a first adjusting screw rod; 434. an annular ring gear; 435. a second drive gear; 436. and a second adjusting screw rod.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
Referring to fig. 1-2, an embodiment of the present invention provides a technical solution: an air injection oil extraction method for an ancient buried hill oil reservoir comprises the following steps:
s1: removing nitrogen from air, and injecting the separated nitrogen into an area 11 above an air layer distribution zone 1 in the ancient buried hill oil reservoir; specifically, ancient buried hill oil reservoir be bottom water distribution area 3, be oil reservoir distribution area 2 above the bottom water distribution area 3, and 2 upper strata in oil reservoir distribution area are gas layer distribution area 1, carry out the denitrogenation separation with the air through air denitrogenation system 20, and wherein, nitrogen gas is 3 with total air ratio in the denitrogenation separation: 5, (namely 3 liters of nitrogen are separated from 5 liters of air, and the rest mixed gas) injecting the separated nitrogen into an area 11 above a gas layer distribution zone 1 (namely an area of an original oil layer separation distribution zone 2 of the gas layer distribution zone 1) in the ancient buried hill oil reservoir through a booster pump, wherein crude oil does not exist in cracks and pores of the area 11 above the original oil layer separation distribution zone 2 of the gas layer distribution zone 1);
s2: and heating the oxygen-enriched mixed gas obtained after the nitrogen of the air is removed, and injecting the oxygen-enriched mixed gas into a lower area 12 of the gas layer distribution zone 1 of the ancient buried hill oil reservoir. Specifically, in step S1, the oxygen-enriched mixed gas remaining after the air is subjected to nitrogen removal and separation, wherein the ratio of oxygen to nitrogen in the oxygen-enriched mixed gas is close to 1: 1, heating the oxygen-enriched mixed gas by a heating system 30, and injecting the oxygen-enriched mixed gas into a lower region 12 of a gas zone 1 of the ancient buried hill oil reservoir (namely a region of the gas zone 1 close to an oil zone 2) by a booster pump.
Preferably, the separated nitrogen is injected into the region 11 above the gas layer distribution zone 1 in the ancient buried hill oil reservoir, and the heated oxygen-enriched mixed gas is injected into the region 12 below the gas layer distribution zone 1 of the ancient buried hill oil reservoir simultaneously.
In the air injection oil extraction method for the ancient buried hill oil reservoir provided by the embodiment, the oxygen-rich mixed gas obtained after nitrogen removal of air is heated and injected into the lower area of the gas layer distribution zone in the ancient buried hill oil reservoir (namely, the gas layer distribution zone area close to the oil layer), so that the high-temperature oxygen-rich mixed gas and the crude oil in the cracks and pores of the gas layer distribution zone area close to the oil layer are subjected to oxidative cracking reaction, and the driving force of crude oil flowing is increased; meanwhile, the rock expands when heated, so that the volume of a rock gap is reduced, and the fluidity of the crude oil is improved;
secondly, no crude oil exists in cracks and pores in the area above the gas layer distribution zone, high-temperature gas is not required to be injected, nitrogen obtained after air is directly denitrified is synchronously injected above the gas layer distribution zone to form a gas cap to realize coordination for oil displacement, the separated nitrogen is matched for use, the nitrogen property is more stable than that of air, the safety of gas injection construction operation is improved, the density of further nitrogen is less than that of oxygen-enriched mixed gas obtained after air is denitrified, the nitrogen is stably positioned in the area above the gas layer distribution zone and is pressurized to enable the high-temperature oxygen-enriched mixed gas to be positioned in the area below the gas layer distribution zone, the heating effect is improved, meanwhile, the nitrogen obtained after separation is directly introduced into the area above the gas layer distribution zone, the demand of high-temperature hot air is remarkably reduced during injection and production construction, and the oil extraction cost is reduced.
In another embodiment provided by the present invention, step S1 is preceded by: according to the total well planning number, arranging an injection-production well pattern in an ancient buried hill oil reservoir exploitation area; and (3) combining a gas injection oil extraction pipe bundle 10 to the middle lower part of the injection and production well pattern, wherein the combined gas injection oil extraction pipe bundle 10 is provided with a first gas injection channel, a second gas injection channel and an oil extraction pipeline 103. Specifically, the first gas injection channel and the second gas injection channel are independent from each other, and the first gas injection channel and the second gas injection channel are provided with independent gas inlet interfaces and gas injection interfaces.
Step S2 is followed by: the high pressure gas injected by steps S1 and S2 pushes the zone of the reservoir to flow and to produce the crude oil through the production passage.
Injecting nitrogen into an area 11 above the gas layer distribution zone 1 of the ancient buried hill oil reservoir in the step S1, and injecting gas through a first gas injection channel in the combined gas injection oil extraction pipe bundle 10; namely, the gas injection port at the bottom end of the first gas injection channel in the combined gas injection production tube bundle 10 is located in the upper area 11 of the gas layer distribution zone 1.
In step S2, injecting high-temperature oxygen-enriched mixed gas into the lower region 12 of the gas layer distribution zone 1 of the ancient buried hill oil reservoir, and injecting gas through the second gas injection channel of the combined gas injection oil extraction tube bundle 10. Namely, the gas injection port at the bottom end of the second gas injection channel in the combined gas injection production tube bundle 10 is located in the lower area 12 of the gas layer distribution zone 1.
The production passage is a production conduit 103 in a combined gas injection production conduit bundle. The bottom end of the oil extraction pipeline 103 extends to the region of the oil layer distribution zone 2 of the ancient buried hill oil reservoir.
Specifically, through setting up combination gas injection oil extraction tube bank 10, realize when extracting oil to ancient buried hill oil reservoir exploitation region, only need set up single oil well cooperation combination gas injection oil extraction tube bank 10 and realize promptly to ancient buried hill oil reservoir gas reservoir upper zone 11 the nitrogen gas of separation of injection, to ancient buried hill oil reservoir gas reservoir lower zone 12 inject the oxygen boosting mist after the heating and to producing oil to ancient buried hill oil reservoir gas reservoir distribution zone 2, need not set up a plurality of injection wells and independently inject nitrogen gas and oxygen boosting mist, also need not set up the production well and extract oil, reduce the number of opening the well, shorten well completion operation cycle, improve the stability of geology, it is more convenient to annotate and adopt the construction, shorten drive crude oil moving stroke, improve oil recovery efficiency.
Referring to fig. 3-7, another technical solution is provided in the embodiments of the present invention: the utility model provides an ancient buried hill oil reservoir air injection oil recovery equipment, includes combination gas injection oil recovery tube bundle 10, and combination gas injection oil recovery tube bundle 10 includes:
the first gas injection channel is used for injecting nitrogen separated by removing nitrogen from air into an area 11 above a gas layer distribution zone 1 in the ancient buried hill oil reservoir;
the second gas injection channel is used for injecting oxygen-enriched mixed gas obtained after air nitrogen removal into a lower area 12 of the gas layer distribution zone 1 of the ancient buried hill oil reservoir through heating;
an oil production line 103.
Specifically, the combined gas injection and oil extraction tube bundle 10 is used for injecting nitrogen into an area 11 above a gas layer distribution zone 1 in the ancient buried hill oil reservoir, injecting high-temperature oxygen-enriched mixed gas into an area 12 below the gas layer distribution zone 1, and extracting oil from the oil layer distribution zone 2 in the ancient buried hill oil reservoir, the ancient buried hill oil reservoir gas injection and oil extraction equipment further comprises an air nitrogen removal system 20 and a heating system 30, a separated nitrogen outlet of the air nitrogen removal system 20 is communicated with an inlet of a first gas injection channel so as to inject the nitrogen separated by air nitrogen removal into the area 11 above the gas layer distribution zone 1 in the ancient buried hill oil reservoir through the first gas injection channel, a residual oxygen-enriched mixed gas outlet after the nitrogen separation by the air nitrogen removal system 20 is communicated with an inlet of the heating system 30, and an outlet of the heating system 30 is communicated with an inlet of a second gas injection channel so as to inject the residual oxygen-enriched mixed gas after the air nitrogen removal separation into the area 12 below the gas layer distribution zone 1 in the ancient buried hill oil reservoir through the second gas injection channel. The oil production pipeline 103 realizes oil production.
The embodiment provides an ancient buried hill oil reservoir air injection oil extraction equipment, realize through combination gas injection oil extraction tube bank 10 cooperation single oil well that to the ancient buried hill oil reservoir in the gas reservoir regional 11 the injection of the nitrogen gas of separation, to the ancient buried hill oil reservoir gas reservoir regional 12 below of distribution area 1 the injection of the oxygen boosting mist after the heating and to producing oil to the oil reservoir distribution area 2 of ancient buried hill oil reservoir, need not set up a plurality of injection wells and independently inject nitrogen gas and oxygen boosting mist, also need not set up the production well and produce oil, reduce the well opening quantity, shorten well completion operation cycle, improve the stability of geology, the injection and production construction is more convenient, shorten drive crude oil moving stroke, improve oil recovery efficiency.
In still another embodiment of the present invention, the combined gas injection production tube bundle 10 includes a casing 101, a core tube 102 is disposed through the casing 101, a production pipe 103 is disposed through the core tube 102, a first gas injection channel is formed between the casing 101 and the core tube 102, a second gas injection channel is formed between the core tube 102 and the production pipe 103, a first gas injection joint 1011 is fixedly secured to the bottom end of the casing 101, and a second gas injection joint 1021 is fixedly secured to the bottom end of the core tube 102.
Specifically, the outer diameter of the core tube 102 is smaller than the inner diameter of the casing 101, the length of the core tube 102 is larger than the length of the casing 101, the core tube 102 is embedded in the casing 101 in a penetrating manner, a first gas injection channel is formed between the outer part of the core tube 102 and the inner part of the casing 101, a first gas inlet joint 1012 is arranged at the top end of the casing 101, a separated nitrogen outlet of the air nitrogen removal system 20 is communicated with the first gas inlet joint 1012 through a pipeline so as to realize the injection of nitrogen into the first gas injection channel, the outer diameter of the production pipeline 103 is smaller than the inner diameter of the core tube 102, the length of the production pipeline 103 is larger than the length of the core tube 102, the production pipeline 103 is embedded in the core tube 102 in a penetrating manner, a second gas injection channel is formed between the outer part of the production pipeline 103 and the inner part of the core tube 102, a second gas inlet joint 1022 is arranged at the top end of the core tube 102, a residual oxygen-enriched mixed gas outlet after the nitrogen removal system 20 separates nitrogen is communicated with an inlet of the heating system 30, an outlet of the heating system 30 is communicated with the second gas inlet joint 1022, so as to realize the second gas injection channel of the heated high-temperature oxygen-enriched mixed gas main body.
Preferably, a heat insulation layer is arranged outside the core pipe 102 to prevent heat exchange between the heat of the high-temperature oxygen-enriched mixed gas input inside the core pipe 102 and nitrogen conveyed outside the core pipe 102 to cause heat energy loss, and meanwhile, the core pipe 102 is colored outside the oil production pipeline 103, a second gas injection channel is formed between the core pipe 102 and the oil production pipeline 103 to convey the high-temperature oxygen-enriched mixed gas to assist in heating the oil production pipeline 103, so that crude oil conveyed inside the oil production pipeline 103 is heated to improve fluidity, and oil extraction is more stable.
In still another embodiment provided by the present invention, preferably, an oil extraction hole 1031 is formed at the bottom end of the oil production pipeline 103, the gas channeling prevention mechanism 40 is movably sleeved at the bottom end of the oil production pipeline 103, the gas channeling prevention mechanism 40 includes an oil holder 41, a plugging component 42 and a driving unit 43, the oil holder 41 is movably sleeved on the oil production pipeline 103, the plugging component 42 is movably arranged at the inner side of the oil production pipeline 103 to plug the oil extraction hole 1031 located in the outer region of the oil holder 41 on the oil production pipeline 103, and the driving unit 43 is used for synchronously driving the oil holder 41 and the plugging component 42 to lift and lower for adjustment. Specifically, the oil pan 41 is a horn-shaped mechanism with an upward opening, and a connecting sleeve is provided at the center of the oil pan 41 and movably sleeved on the oil production pipeline 103 through the connecting sleeve.
As is known, the existing air injection and oil extraction of the ancient buried hill oil reservoir are respectively performed with air injection and oil extraction through an injection well and a production well, multiple point positions are required to start the injection well and the production well, the geological stability is influenced, the working efficiency is increased, the construction period is prolonged, meanwhile, crude oil needs to flow from the injection well to the production well during oil displacement, the oil displacement stroke is large, the crude oil recovery efficiency is influenced, the injection well and the production well are directly combined and used, because the air injection and the oil extraction are at the same point position, the viscosity of gas is lower than that of oil, the seepage speed of gas phase is higher than that of oil phase, the injection and extraction pressure difference can lead the gas to break through an oil-gas interface to generate gas channeling, namely, the injected gas enters the production well along a gas channeling channel to cause high oil-gas ratio and influence the oil extraction effect, and by arranging a gas channeling prevention mechanism 40 at the bottom end of an oil extraction pipeline 103, the gas channeling prevention mechanism 40 comprises an oil support 41, the bottom end of the oil production pipeline 103 is provided with an oil extraction hole 1031, so that the oil production pipeline 103 is lowered below an oil layer distribution zone 2 or the oil layer distribution zone 2 and bottom water distribution zone 3 interface is matched with an oil support 41 for production during oil extraction, the oil production hole 1031 is far away from the cross section of the gas layer distribution zone 1 and the oil layer distribution zone 2, and water is prevented from entering through the oil support 41 (at the moment, bottom water in the bottom water distribution zone of the ancient buried hill oil reservoir is required to be inactive), further, the bottom water distribution zone is communicated, oil and gas reservoir pressure change can be caused during oil extraction, when the bottom water pressure is lower than the saturated pressure, liquid phase components can be changed, so that the bottom water active state is changed, when the bottom water distribution zone 3 is active, part of the bottom water enters the oil production pipeline 103 through the oil support 41 due to the active bottom water, during actual production, the oil extraction can be lifted and adjusted through a driving unit 43 according to the bottom water content in oil extraction of the oil production pipeline 103, meanwhile, the blocking component 42 is synchronously adjusted, the oil extraction hole 1031 in the area outside the oil support 41 on the oil production pipeline 103 is blocked through the blocking component 42, namely, the oil extraction hole 1031 in the area above the oil support 41 on the oil production pipeline 103 is blocked, gas channeling is prevented, the oil extraction hole 1031 in the area below the oil support 41 on the oil production pipeline 103 is blocked, bottom water is prevented from entering the oil production pipeline 103, dynamic adjustment of the gas channeling prevention mechanism 40 is realized due to the fact that the bottom water activity state of the ancient buried hill changes according to the pressure change during actual oil production, the oil production effect is remarkably improved, and the water containing problem of oil production and the channeling problem are prevented.
In still another embodiment of the present invention, the plugging assembly 42 includes a plugging tube 421, a strip-shaped through hole 422 used in conjunction with the oil production hole 1031 is disposed at a middle section of the plugging tube 421, the plugging tube 421 is a tubular structure, the plugging tube 421 is movably embedded at a bottom end of the oil production pipeline 103, and a length of the strip-shaped through hole 422 is equal to a horizontal projection height of the oil holder 41, that is, the strip-shaped through hole 422 is adapted to the oil holder 41, the driving unit 43 includes a tip seat, the tip seat is fixed at the bottom end of the oil production pipeline 103, a driving toothed disc 431 is rotatably disposed on the tip seat, a plurality of first driving gears 432 are rotatably disposed on the tip seat and located outside the driving toothed disc 431, the first driving gears 432 are engaged with the driving toothed disc 431, a first adjusting screw rod 433 is fixed on the first driving gears 432, a connecting nut seat 423 is fixed inside the plugging tube 421, the connecting nut seat 423 is spirally adjusted on the first adjusting screw rod 433, an annular gear ring 434 is arranged on the outer side of the first driving gear 432 on the end socket, a plurality of second driving gears 435 are rotatably arranged on the outer side of the annular gear ring 434 on the end socket, the annular gear ring 434 is respectively meshed with the first driving gear 432 and the second driving gear 435, a second adjusting screw 436 is fixed on the second driving gear 435, the second adjusting screw 436 is spirally penetrated through the oil holder 41, namely the driving unit 43 drives the oil holder 41 and the plugging component 42 to lift and adjust, specifically, the plurality of first driving gears 432 are rotatably driven by the driving gear 431, the first driving gear 432 is matched with the first adjusting screw 433 to lift and adjust the plugging pipe 421, meanwhile, the first driving gear 432 is rotatably matched with the annular gear ring 434 to drive the plurality of second driving gears 435 to rotate, the second driving gear 435 is matched with the second adjusting screw 436 to lift and adjust the oil holder 41, and finally, pressure change during actual oil extraction is realized, the change of the active state of the bottom water of the ancient buried hill oil reservoir realizes the dynamic adjustment of the gas channeling prevention mechanism 40, the oil extraction effect is obviously improved, and the problems of water content in oil extraction and channeling are prevented.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (10)
1. An air injection oil extraction method for an ancient buried hill oil reservoir is characterized by comprising the following steps:
s1: removing nitrogen from air, and injecting the separated nitrogen into an area above a gas layer distribution zone in the ancient buried hill oil reservoir;
s2: and heating the oxygen-enriched mixed gas obtained after the air is denitrified and injecting the oxygen-enriched mixed gas into the lower area of the gas layer distribution zone of the ancient buried hill oil reservoir.
2. The method for extracting oil from ancient buried hill oil reservoir by injecting air according to claim 1, wherein the step S1 is preceded by the steps of:
according to the total well planning number, arranging an injection-production well pattern in an ancient buried hill oil reservoir exploitation area;
and a combined gas injection oil extraction pipe bundle (10) is arranged at the middle lower part of the injection and production well pattern, and the combined gas injection oil extraction pipe bundle (10) is provided with a first gas injection channel, a second gas injection channel and an oil extraction pipeline (103).
3. The method for extracting oil from ancient buried hill oil reservoir by injecting air according to claim 1, wherein the step S2 is followed by the steps of: the high pressure gas injected from step S1 and step S2 pushes the zone of the reservoir to flow and to produce the crude oil through the production channel.
4. The method for oil recovery from ancient buried hill oil reservoir by injecting air according to claim 2, wherein in step S1, nitrogen is injected into the upper region of the gas layer distribution zone of the ancient buried hill oil reservoir through the first gas injection channel in the combined gas injection oil extraction pipe bundle (10) for gas injection;
and in the step S2, injecting high-temperature oxygen-enriched mixed gas into the lower area of the gas layer distribution zone of the ancient buried hill oil reservoir, and injecting gas through the second gas injection channel of the combined gas injection oil extraction tube bundle (10).
5. The method for extracting oil from ancient buried hill oil reservoir by injecting air according to claim 2, wherein the oil extraction channel is an oil extraction channel (103) in a combined gas injection oil extraction pipe bundle.
6. An air injection oil extraction device for an ancient buried hill oil reservoir, which is characterized by comprising a combined gas injection oil extraction tube bundle (10), wherein the combined gas injection oil extraction tube bundle (10) comprises:
the first gas injection channel is used for injecting nitrogen separated by removing nitrogen from air into an area above a gas layer distribution zone in the ancient buried hill oil reservoir;
and the second gas injection channel is used for injecting the oxygen-enriched mixed gas obtained after the air is denitrified into the lower area of the gas layer distribution zone of the ancient buried hill oil reservoir through heating.
7. The ancient buried hill oil reservoir air injection oil extraction equipment according to claim 6, characterized in that the combined air injection oil extraction tube bundle comprises a casing (101), a core tube (102) penetrates through the casing (101), an oil extraction pipeline (103) penetrates inside the core tube (102), a first air injection channel is formed between the casing (101) and the core tube (102), and a second air injection channel is formed between the core tube (102) and the oil extraction pipeline (103).
8. The ancient buried hill reservoir air injection oil recovery equipment and method as claimed in claim 6, characterized in that the bottom end of the casing pipe (101) is fixedly connected with a first air injection joint (1011), and the bottom end of the core pipe (102) is fixedly connected with a second air injection joint (1021).
9. The air injection oil extraction equipment for the ancient buried hill oil reservoir according to claim 6, wherein an oil extraction hole (1031) is formed in the bottom end of the oil extraction pipeline (103), the bottom end of the oil extraction pipeline (103) is movably sleeved with a gas channeling prevention mechanism (40), the gas channeling prevention mechanism (40) comprises an oil support (41), a plugging component (42) and a driving unit (43), the oil support (41) is movably sleeved on the oil extraction pipeline (103), the plugging component (42) is movably arranged on the inner side of the oil extraction pipeline (103) so as to plug the oil extraction hole (1031) in the outer area of the oil support (41) on the oil extraction pipeline (103), and the driving unit (43) is used for synchronously driving the oil support (41) and the plugging component (42) to be lifted and lowered.
10. The air injection oil extraction equipment for the ancient buried hill oil reservoir according to claim 6, wherein the blocking component (42) comprises a blocking pipe (421), and a strip-shaped through hole (422) matched with the oil extraction hole (1031) is formed in the middle section of the blocking pipe (421).
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| CN1834403A (en) * | 2006-04-17 | 2006-09-20 | 尤尼斯油气技术（中国）有限公司 | Hot air filling balance oil recovery technique 'zhanqian' mountain oil reservoir |
| AU2007259057A1 (en) * | 2006-06-14 | 2007-12-21 | Coretrax Global Limited | Top filling tubing |
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