CN106321036A - CO2 flooding high-gas-liquid-ratio oil well anti-gas anti-corrosion lifting process - Google Patents
CO2 flooding high-gas-liquid-ratio oil well anti-gas anti-corrosion lifting process Download PDFInfo
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- CN106321036A CN106321036A CN201510402457.XA CN201510402457A CN106321036A CN 106321036 A CN106321036 A CN 106321036A CN 201510402457 A CN201510402457 A CN 201510402457A CN 106321036 A CN106321036 A CN 106321036A
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Abstract
The invention discloses a CO2 flooding high-gas-liquid-ratio oil well anti-gas anti-corrosion lifting process, relates to the technical field of tertiary oil recovery artificial lifting and belongs to a CO2 flooding anti-gas anti-corrosion lifting process. The CO2 flooding high-gas-liquid-ratio oil well anti-gas anti-corrosion lifting process is designed for solving the problems that in a conventional lifting process, during CO2 flooding oil well exploitation, the pump efficiency of an oil well pump is lowered, the oil well jacket pressure is raised, and lifting equipment is liable to corrosion. According to the CO2 flooding high-gas-liquid-ratio oil well anti-gas anti-corrosion lifting process, a gas-liquid mixture flowing out from the stratum is subjected three times of gas-liquid separation through a gas-liquid separator 6, the separated gas-liquid mixture is lifted to the ground through an anti-gas oil well pump, separated out gas enters an oil jacket annulus, when the jacket pressure reaches the opening pressure, a gas lift valve is opened, the gas in the oil jacket annulus enters an oil pipe 3 and enters a ground production system along with crude oil; and meanwhile, special anti-corrosion treatment is conducted aiming at main components. The CO2 flooding high-gas-liquid-ratio oil well anti-gas anti-corrosion lifting process is suitable for a high-gas-liquid-ratio CO2 flooding oil well and has the advantages that the life of the oil well pump is prolonged, the pump efficiency of the oil well pump is improved, the jacket pressure is controlled reasonably, and the corrosion resistance is good.
Description
Technical field:The present invention relates to tertiary oil recovery artificial lift technology field, belong to a kind of CO2Drive gas-tight anticorrosion lifting technology.
Background technology:CO2Drive is to improve one of recovery ratio method, the low-permeability oil deposit bad for waterflooding effect and segment block oil reservoir, CO in tertiary oil recovery2Drive and can obtain good effect.But, after producing a period of time, CO2The oil well produced liquid gas liquid ratio driven significantly raises, when gas liquid ratio is more than 50 m3/m3, conventional lifting technology can show obvious inadaptability, mainly show as fluid full level poor, and pumping efficiency of oil pump declines, and gas lock can occur time serious；Oil well casing pressure raises, and causes flowing bottomhole pressure (FBHP) too high, affects formation fluid and ooze out, causes yield to decline；CO2Gas content is high, accelerates the formation of the erosions such as carbonic acid, causes lifting equipment seriously corroded, it is impossible to effectively keeps and plays CO2Oil displacement efficiency.
For ensureing the normal production of oil well, the present invention proposes a kind of CO2Drive high gas-liquid ratio oil well gas-tight anticorrosion lifting technology.First pass through being applied in combination of gas-liquid separation device, airlock-resistant oil pump and gas lift valve so that this lifting technology can preferably be applicable to high gas-liquid ratio CO2Displacement of reservoir oil well, while improving pump efficiency, reasonably controls casing pressure, secondly uses special surface treatment method to carry out preservative treatment, thus finally ensures the normal production of oil well.
Summary of the invention:The invention aims to improve CO2Drive machine-pumped oil well pumping efficiency of oil pump, conservative control casing pressure, a kind of CO that reduction lifting equipment corrodes and designs2Drive high gas-liquid ratio oil well gas-tight anticorrosion lifting technology.
It is an object of the invention to be realized by following device: it is made up of sleeve pipe, gas lift valve, oil pipe, sucker rod, airlock-resistant oil pump, gas-liquid separation device, tail pipe and plug；Airlock-resistant oil pump is made up of standing valve, pump barrel, plunger and travelling valve；Gas-liquid separation device is made up of central canal and outer tube；Plunger lower end offers pressure guide hole, and outer tube top offers feed liquor, steam vent；Wherein gas lift valve upper and lower screwed connection oil pipe, pump barrel upper end is connected with oil pipe thread, pump barrel lower end and gas-liquid separation device screwed connection, and plunger is connected with sucker rod screw thread, and gas-liquid separation device is connected with tail pipe screw thread, tail pipe and plug screwed connection；This technique through the following steps that realize:
A, first oil pipe, gas lift valve, pump barrel, gas-liquid separation device, tail pipe and plug are connected, under enter in sleeve pipe, secondly plunger is connected with sucker rod, under enter inside pump barrel；
When b, upstroke, sucker rod drives plunger to move upward, gas-liquid mixture flows out from producing well perforated interval, flow up in entering the annular space between gas-liquid separation device and sleeve pipe, owing to gas-liquid density contrast is bigger, gas-liquid mixture produces gravity settling separation at oil jacket annular space, and isolated a large amount of gases continue up flowing in oil jacket annular space, completes gas-liquid separation for the first time；
C, complete for the first time gas-liquid separation after, gas-liquid mixture containing a certain amount of gas, by feed liquor, the steam vent of gas-liquid separation device upper end, in the annular space that entrance gas-liquid separation device outer tube and central canal surround, feed liquor, the pore size of steam vent make the air pocket in gas-liquid mixture cannot be introduced in gas-liquid separation device, thus producing another gas-liquid separation, isolated gas flows up in oil jacket annular space, completes second time gas-liquid separation；
D, complete second time gas-liquid separation after, gas-liquid mixture containing a certain amount of gas enters gas-liquid separation device, the annular space formed at outer tube and central canal flows downward, and produce gravity settling separation, isolated gas flows up, flow out to oil jacket annular space by feed liquor, steam vent, complete third time gas-liquid separation；
E, achieve three gas-liquid separations after gas-liquid mixture under the swabbing action of plunger, enter airlock-resistant oil pump, in gas-liquid mixture now, air content is the least, and liquid has solution gas abjection after entering airlock-resistant oil pump, when plunger is up close to during to top dead centre, the pressure guide hole of plunger lower end is exposed in oil pipe, pump barrel internal pressure reaches balance with head of liquid moment in oil pipe, and standing valve cuts out；
When f, down stroke, plunger is descending, and owing to travelling valve pressure at two ends balances, travelling valve opens rapidly, and meanwhile, gas-liquid mixture, under the castering action of airlock-resistant oil pump, in the oil pipe being given rise to above airlock-resistant oil pump, and gives rise to ground by oil pipe；
G, completing the gas after three gas-liquid separations and enter oil jacket annular space, when casing pressure is more than the unlatching pressure of gas lift valve, gas lift valve is opened, and makes the gas in sleeve pipe enter oil pipe and enters ground production system with crude oil.
Airlock-resistant oil pump pump barrel inwall is that titanium-aluminium alloy is ceramic-lined, outer plunger surface surfacing superhard alloy.
Gas-liquid separation device Bononizing pretreatment；Gas lift valve valve body material is 301 rustless steels.
Compared with the prior art the present invention, has the advantage that
1), in this lifting technology, gas-liquid separation device volume is little, simple in construction, separation efficiency high, antiseptic property is good；
2), airlock-resistant oil pump simple in construction in this lifting technology, good, applied widely without extra consumable accessory, antiseptic property, can preferably be applicable to the oil well that gas liquid ratio is high；
3), gas lift valve, without loading element, simple in construction, removes conveniently, does not affect normal job execution program in this lifting technology.
Accompanying drawing illustrates:Fig. 1 is that schematic diagram is applied at scene of the present invention.
In figure: 1-sleeve pipe, 2-gas lift valve, 3-oil pipe, 4-sucker rod, 5-airlock-resistant oil pump, 6-gas-liquid separation device, 7-tail pipe, 8 plugs, 9 perforated intervals, 10 central canals, 11 outer tubes, 12 feed liquors, steam vent, 13 standing valves, 14 pump barrels, 15 pressure guide holes, 16 plungers, 17 travelling valves.
Detailed description of the invention:Below in conjunction with accompanying drawing, the present invention is further described, it is an object of the invention to be realized by following device: it is made up of sleeve pipe 1, gas lift valve 2, oil pipe 3, sucker rod 4, airlock-resistant oil pump 5, gas-liquid separation device 6, tail pipe 7 and plug 8；Airlock-resistant oil pump 5 is made up of standing valve 13, pump barrel 14, plunger 16 and travelling valve 17；Gas-liquid separation device 6 is made up of central canal 10 and outer tube 11；Plunger 16 lower end offers pressure guide hole 15, and outer tube 11 top offers feed liquor, steam vent 12；Wherein gas lift valve about 2 screwed connection oil pipe 3, pump barrel 14 upper end and oil pipe 3 screwed connection, pump barrel 14 lower end and gas-liquid separation device 6 screwed connection, plunger 16 is connected with sucker rod 4 screw thread, gas-liquid separation device 6 is connected with tail pipe 7 screw thread, tail pipe 7 and plug 8 screwed connection；This technique through the following steps that realize:
A, first oil pipe 3, gas lift valve 2, pump barrel 14, gas-liquid separation device 6, tail pipe 7 and plug 8 are connected, under enter in sleeve pipe 1, secondly plunger 16 is connected with sucker rod 4, under to enter pump barrel 14 internal；
When b, upstroke, sucker rod 4 drives plunger 16 to move upward, gas-liquid mixture flows out from producing well perforated interval 9, flow up in entering the annular space between gas-liquid separation device 6 and sleeve pipe 1, owing to gas-liquid density contrast is bigger, gas-liquid mixture produces gravity settling separation at oil jacket annular space, and isolated a large amount of gases continue up flowing in oil jacket annular space, completes gas-liquid separation for the first time；
C, complete for the first time gas-liquid separation after, gas-liquid mixture containing a certain amount of gas, by the feed liquor of gas-liquid separation device 6 upper end, steam vent 12, in the annular space that entrance gas-liquid separation device outer tube 11 and central canal 10 surround, feed liquor, the pore size of steam vent 12 make the air pocket in gas-liquid mixture cannot be introduced in gas-liquid separation device 6, thus producing another gas-liquid separation, isolated gas flows up in oil jacket annular space, completes second time gas-liquid separation；
D, complete second time gas-liquid separation after, gas-liquid mixture containing a certain amount of gas enters gas-liquid separation device 6, the annular space formed at outer tube 11 and central canal 10 flows downward, and produce gravity settling separation, isolated gas flows up, flow out to oil jacket annular space by feed liquor, steam vent 12, complete third time gas-liquid separation；
E, achieve three gas-liquid separations after gas-liquid mixture under the swabbing action of plunger 16, enter airlock-resistant oil pump 5, in gas-liquid mixture now, air content is the least, and liquid has solution gas abjection after entering airlock-resistant oil pump 5, when plunger 16 is up close to during to top dead centre, the pressure guide hole 15 of plunger 16 lower end is exposed in oil pipe 3, pump barrel 14 internal pressure reaches balance with head of liquid moment in oil pipe 3, and standing valve 13 cuts out；
When f, down stroke, plunger 16 is descending, owing to travelling valve 17 pressure at two ends balances, travelling valve 17 is opened rapidly, and meanwhile, gas-liquid mixture is under the castering action of airlock-resistant oil pump 5, given rise in airlock-resistant oil pump 5 oil pipe 3 above, and given rise to ground by oil pipe 3；
G, completing the gas after three gas-liquid separations and enter oil jacket annular space, when casing pressure is more than the unlatching pressure of gas lift valve 2, gas lift valve 2 is opened, and makes the gas in sleeve pipe 1 enter oil pipe 3 and enters ground production system with crude oil.
Airlock-resistant oil pump pump barrel 14 inwall is that titanium-aluminium alloy is ceramic-lined, plunger 16 outer surface surfacing superhard alloy.
Gas-liquid separation device 6 Bononizing pretreatment；Gas lift valve 2 valve body material is 301 rustless steels.
Claims (3)
1. a CO2Driving high gas-liquid ratio oil well gas-tight anticorrosion lifting technology, this technique is realized by following device: it is made up of sleeve pipe (1), gas lift valve (2), oil pipe (3), sucker rod (4), airlock-resistant oil pump (5), gas-liquid separation device (6), tail pipe (7) and plug (8)；Airlock-resistant oil pump (5) is made up of standing valve (13), pump barrel (14), plunger (16) and travelling valve (17)；Gas-liquid separation device (6) is made up of central canal (10) and outer tube (11)；Plunger (16) lower end offers pressure guide hole (15), and outer tube (11) top offers feed liquor, steam vent (12)；Wherein gas lift valve (2) screwed connection oil pipe (3) up and down, pump barrel (14) upper end and oil pipe (3) screwed connection, pump barrel (14) lower end and gas-liquid separation device (6) screwed connection, plunger (16) is connected with sucker rod (4) screw thread, gas-liquid separation device (6) is connected with tail pipe (7) screw thread, tail pipe (7) and plug (8) screwed connection；It is characterized in that: this technique through the following steps that realize:
A, first oil pipe (3), gas lift valve (2), pump barrel (14), gas-liquid separation device (6), tail pipe (7) and plug (8) are connected, under enter sleeve pipe (1) in, secondly plunger (16) is connected with sucker rod (4), under enter inside pump barrel (14)；
When b, upstroke, sucker rod (4) drives plunger (16) to move upward, gas-liquid mixture flows out from producing well perforated interval (9), flow up in entering the annular space between gas-liquid separation device (6) and sleeve pipe (1), owing to gas-liquid density contrast is bigger, gas-liquid mixture produces gravity settling separation at oil jacket annular space, and isolated a large amount of gases continue up flowing in oil jacket annular space, completes gas-liquid separation for the first time；
C, complete for the first time gas-liquid separation after, gas-liquid mixture containing a certain amount of gas, by the feed liquor of gas-liquid separation device (6) upper end, steam vent (12), in the annular space that entrance gas-liquid separation device outer tube (11) and central canal (10) surround, feed liquor, the pore size of steam vent (12) make the air pocket in gas-liquid mixture cannot be introduced in gas-liquid separation device (6), thus produce another gas-liquid separation, isolated gas flows up in oil jacket annular space, completes second time gas-liquid separation；
D, complete second time gas-liquid separation after, gas-liquid mixture containing a certain amount of gas enters gas-liquid separation device (6), the annular space formed at outer tube (11) and central canal (10) flows downward, and produce gravity settling separation, isolated gas flows up, flow out to oil jacket annular space by feed liquor, steam vent (12), complete third time gas-liquid separation；
E, achieve three gas-liquid separations after gas-liquid mixture under the swabbing action of plunger (16), enter airlock-resistant oil pump (5), in gas-liquid mixture now, air content is the least, and liquid has solution gas abjection after entering airlock-resistant oil pump (5), when plunger (16) is up close to during to top dead centre, the pressure guide hole (15) of plunger (16) lower end is exposed in oil pipe (3), pump barrel (14) internal pressure and oil pipe (3) interior head of liquid moment reach balance, and standing valve (13) cuts out；
When f, down stroke, plunger (16) is descending, owing to travelling valve (17) pressure at two ends balances, travelling valve (17) is opened rapidly, simultaneously, gas-liquid mixture, under the castering action of airlock-resistant oil pump (5), is given rise in airlock-resistant oil pump (5) oil pipe (3) above, and gives rise to ground by oil pipe (3)；
G, completing the gas after three gas-liquid separations and enter oil jacket annular space, when casing pressure is more than the unlatching pressure of gas lift valve (2), gas lift valve (2) is opened, and makes the gas in sleeve pipe (1) enter oil pipe (3) and enters ground production system with crude oil.
A kind of CO the most according to claim 12Drive high gas-liquid ratio oil well gas-tight anticorrosion lifting technology, it is characterised in that: described airlock-resistant oil pump pump barrel (14) inwall is that titanium-aluminium alloy is ceramic-lined, plunger (16) outer surface surfacing superhard alloy.
A kind of CO the most according to claim 12Drive high gas-liquid ratio oil well gas-tight anticorrosion lifting technology, it is characterised in that: described gas-liquid separation device (6) Bononizing pretreatment；Gas lift valve (2) valve body material is 301 rustless steels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510402457.XA CN106321036A (en) | 2015-07-10 | 2015-07-10 | CO2 flooding high-gas-liquid-ratio oil well anti-gas anti-corrosion lifting process |
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| CN201510402457.XA CN106321036A (en) | 2015-07-10 | 2015-07-10 | CO2 flooding high-gas-liquid-ratio oil well anti-gas anti-corrosion lifting process |
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Cited By (4)
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| CN110230484A (en) * | 2018-03-06 | 2019-09-13 | 中国石油天然气股份有限公司 | Oil recovery mechanism |
| CN110318727A (en) * | 2018-03-29 | 2019-10-11 | 中国石油天然气股份有限公司 | Oil well hoisting system for gas-tight |
| CN111520116A (en) * | 2020-03-31 | 2020-08-11 | 东营市朝阳石油科技有限公司 | Oil-gas lifting device and method for high oil-gas ratio oil field |
| CN114687705A (en) * | 2020-12-29 | 2022-07-01 | 中国石油化工股份有限公司 | Casing gas pressure reduction gas lift pipe column and using method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230484A (en) * | 2018-03-06 | 2019-09-13 | 中国石油天然气股份有限公司 | Oil recovery mechanism |
| CN110230484B (en) * | 2018-03-06 | 2021-08-31 | 中国石油天然气股份有限公司 | Oil extraction mechanism |
| CN110318727A (en) * | 2018-03-29 | 2019-10-11 | 中国石油天然气股份有限公司 | Oil well hoisting system for gas-tight |
| CN111520116A (en) * | 2020-03-31 | 2020-08-11 | 东营市朝阳石油科技有限公司 | Oil-gas lifting device and method for high oil-gas ratio oil field |
| CN114687705A (en) * | 2020-12-29 | 2022-07-01 | 中国石油化工股份有限公司 | Casing gas pressure reduction gas lift pipe column and using method thereof |
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