CN103277075A

CN103277075A - Technology for realizing solid burying maximization and residual oil displacement by supercritically injecting CO2 (carbon dioxide) excessively into oil well

Info

Publication number: CN103277075A
Application number: CN2013102165983A
Authority: CN
Inventors: 杨道永; 高俊民; 张广聊; 赵智勇; 杨新泉
Original assignee: SHANDONG CHENGLIN HIGH-NEW TECHNOLOGY INDUSTRY Co Ltd
Current assignee: Shandong Chenglin High Tech Industry Co ltd
Priority date: 2013-06-04
Filing date: 2013-06-04
Publication date: 2013-09-04
Anticipated expiration: 2033-06-04
Also published as: CN103277075B

Abstract

The invention relates to a technology for realizing solid burying maximization and residual oil displacement by supercritically injecting CO2 (carbon dioxide) excessively into an oil well. According to the technology, a high-pressure air pump, an injection well, an oil producing well, a blocking area, a crack seam, a break seam and a CO2 dispersionarea are adopted. The technology for realizing solid burying maximization and residual oil displacement by supercritically injecting CO2 excessively into the oil well is characterized in that the high-pressure air pump injects CO2 into a waste oil filed or an oil layer in an oil area under the supercritical pressure via the injection well, and thick, sticky and dispersed residual oil is displaced to be discharged out of the oil producing well by the aid of ultrastrong permeability, diffusivity and cleaning capability of CO2 liquid. Blocking materials are repeatedly injected into the injection well at intervals to block a smooth channel between the injection well and the oil producing well, the CO2 liquid is forced to disperse and pressurize to crack oil layer partitions and penetrate oil area partitions on the same oil layer, and thus the CO2 liquid is dispersed to all partitions, dead angles and blind areas. Compared with the prior art, the technology for realizing solid burying maximization and residual oil displacement by supercritically injecting CO2 excessively into the oil well has the advantages of thorough residual oil displacement, large capacity of solid-buried CO2, stable sealed storage, less air pollution, freedom of underground pollution, and environment-protection and emission reduction under the support of creating new benefits, so that the technology has great popularization and application values.

Description

The overcritical excessive injection CO of oil well 2Realize maximizing solid and the Residual oil displacement technology of burying

One, technical field:

The present invention relates to carbon fixation and emission reduction and oil second mining comprehensive technology, relate to the overcritical excessive injection CO of a kind of oil well specifically ₂Realize maximizing solid and the Residual oil displacement technology of burying.

Two, background technology:

The CO that modern times, mankind's activity produced ₂, head and shoulders above the storage that possesses of nature normal circulation metabolism receive and utilize mechanism, to making CO ₂Heap in a large number in atmosphere, dominance influences the weather law of the earth, and the structural form of climate change and veneer of crust is worsening human existence condition and living environment.And more regrettably, though this negative variation is familiar with to some extent by people and is puted forth effort and stops, the still development of acceleration and deterioration in the scope of its breadth and depth of reality makes the development of human depths and being entangled with in the contradiction of surviving.Reducing discharging solid carbon and CO ₂In the field of recycling, utilize the residual well in oil field, disused well buries solid CO ₂, displacement Residual oil second mining technology is occupied certain status.Inject CO to low oil-producing area under the prior art ₂As the displacement Residual oil, improve the technology of output, obtained good permeability, diffusivity and cleaning performance.CO ₂Behind the injection oil reservoir, very easily along low-resistance region, to clean mode with water, clean toughening oil on the way, easily injecting the shortest smooth suitable passage of formation between well and the producing well, limited CO ₂Liquid is to the perimeter zone and dead angle, dead space disperse.2, for above-mentioned reasons, cause that displacement Residual oil zone is narrow, area is little, the fuel-displaced quantity of producing well is low, oil content is low, and is of poor benefits, the cost height.3, also for above-mentioned reasons, cause and bury solid CO ₂Quantity is few, buries solid environment instability, CO ₂The multiple bank that leaks easily, nearly long-term effect is all poor.

Three, summary of the invention:

The objective of the invention is at above problem and shortage, provide a kind of to bury solid CO ₂Be main, strengthen the overcritical excessive injection CO of oil well of oil well Residual oil displacement efficiency ₂Realize maximizing solid and the Residual oil displacement technology of burying.

The objective of the invention is to be achieved through the following technical solutions:

The overcritical injection of a kind of oil well CO ₂Solid maximization and Residual oil displacement technology are buried in realization: it comprises high-pressure pump, injection well, producing well, oil reservoir, dead space oil district, and is smooth along passage, shutoff district, pressure-break, fragmentation seam and CO ₂The dispersive region is characterized in that in the old oil field of forfeiture extraction value or scraps oil district, selects, and rebuilds old well, determines to inject well and producing well, or new boring inject well or producing well, by high-pressure pump by injecting well with supercritical pressure infusion CO in the oil reservoir ₂, cleaning, toughening oil and distribution Residual oil are discharged through producing well in the displacement oil reservoir, treat producing well discharge oil mass and overflow CO ₂Ratio reaches established standards, injects CO ₂Pressure when not increasing counter falling, prove to form freely along passage in the oil reservoir that inject quantitative shutoff material to injecting well, the shutoff material is with CO ₂Main flow enters smooth along also obstruction of passage, and formation shutoff district continues the pressurization injection and forces CO ₂Diffusion, high pressure CO ₂Hydraulic pressure splits oil reservoir wall weakness, forms pressure-break, and penetrate oil pocket and form broken seam at interval, cleaning, crude oil is discharged through producing well in displacement dead space, the dead angle oil district, does not measure discharge, sealing producing well to there being extraction value, continues pressurization infusion CO ₂To setting pressure, form maximization and bury solid CO ₂Extensive CO ₂The dispersive region rear enclosed injects well.

The overcritical excessive injection CO of oil well of the present invention ₂Realization is buried solid maximization and Residual oil displacement technology compared with prior art, has following remarkable advantage.

1, the present invention buries solid CO with maximization ₂Be main purpose, be current relevant CO ₂The promotion and application of trapping technique provide follow-up support and assurance, enable to reduce discharging at carbon drop, bring into play actual important function in the environmental protection.

2, inject CO to residual, useless, vacant oil well ₂Filling, capacity is big, it is in stable condition to seal up for safekeeping.With prior art with CO ₂Be used as the raw materials for production application and compare, the quantity of its solid carbon not a magnitude, has more the essential meaning of environmental protection fully.Compare with the ice-bound curing in seabed, deep-sea, not only stable, safe and with low content of technology, the application technology maturation does not more have the explosive risk that discharges.

3, to the oil field under the complex geological condition, oil district infusion CO ₂Carry out that second mining, three is adopted and more times second mining, compare the solution that infusion contains chemical agents such as dispersing agent, bleeding agent, thinner, cleaning more, more environmental protection, can not cause long-term, the serious formation contaminant that is difficult to recover.

4, infusion CO under the supercritical pressure ₂, CO ₂Enter undergroundly with liquid state, utilize liquid CO ₂The superpower permeability that has, diffusivity and cleansing power can be to greatest extent, scatter Residual oil remaining, thickness in the disposable displacement oil reservoir, and gather and the displacement dead space the built-in oil in dead angle by pressure-break, broken seam, improve producing well output, promote the oil well resource utilization.Produce favorable economic benefit, for being the CO of purpose with the reduction of discharging ₂Capture and solidify and hide storage, the offer of advantages driving force, making the protection environment is the social action of purpose, is converted into enterprise's property ambivalent behavior of environmental protection and profit-seeking.

Thereby the present invention has the excellent popularization using value.

Four, description of drawings:

Fig. 1 is the overcritical excessive injection CO of oil well ₂Realize maximizing the longitudinal section schematic diagram that buries solid and Residual oil displacement technology.

Among the figure: 1 high-pressure pump, 2 injects well, 3 producing wells, 4 oil reservoirs, 5 dead spaces oil district, 6 smooth suitable passages, 7 shutoff districts, 8 pressure-breaks, 9 broken seams, 10 CO ₂The dispersive region.

Five, the specific embodiment:

Below in conjunction with Figure of description, to the overcritical excessive injection CO of oil well of the present invention ₂Realize that maximization is buried solid and Residual oil displacement technology is described in further detail:

As Fig. 1, shown in, CO selects to determine in discarded, old oil field or oil district ₂Bury Gu Qu, the inspection archives material may be visited check in case of necessity, by 1: selected well 2 and the producing well 3 of injecting of 3-10, carry out workover treatment to serviceable condition, bore in case of necessity and beat new well, in injecting well 2 well heads installation high-pressure pump 1, with supercritical pressure to oil reservoir 4 infusion CO ₂Change at no obvious pressure, or pressure does not rise counter falling, producing well 3 discharge oil and CO ₂When ratio reaches established standards, follow infusion CO to injecting in the well 2 ₂Add plugging agent, stop up in the oil reservoir 4 and freely form shutoff district 7 along passage 6, pressurization forces CO ₂Spread to the elsewhere.Pressure break oil reservoir 4 forms pressure-break 8 with dead space oil district 5 dividing plates, penetrates and forms broken seam 9 in the oil reservoir 4 at interval.The cleaning dead space, dead angle and the crude oil that is dispersed in distribution are discharged through producing well 3.Treat pressurization injection CO ₂After still do not have effective former oil concentration and discharge rear enclosed producing well 3.Pressurization infusion CO ₂, form extensive CO ₂Dispersive region 10.Reach maximization and bury solid effect rear enclosed injection well 1.

Except the described technical characterictic of manual, be the known technology of those skilled in the art.

Claims

1. overcritical excessive injection CO of oil well ₂Realize maximizing solid and the Residual oil displacement technology of burying, it comprises high-pressure pump, injection well, producing well, oil reservoir, the oily district of dead space, freely stitches and CO along passage, shutoff district, pressure-break, fragmentation ₂The dispersive region is characterized in that by high-pressure pump by injecting well with supercritical pressure infusion CO in the oil reservoir ₂, clean, toughening oil in the displacement oil reservoir, and scatter Residual oil and discharge through producing well, treat producing well discharge oil mass and overflow CO ₂After ratio reaches established standards, inject quantitative shutoff material to injecting well, stop up the smooth suitable passage that injects between well and producing well, form the shutoff district, continue the pressurization infusion and force CO ₂Diffusion, high pressure CO ₂Hydraulic pressure splits the oil reservoir wall and forms pressure-break, penetrates oil pocket and forms broken seam at interval, cleans, and crude oil is discharged through producing well in the displacement dead space oil district, does not discharge to there being the extraction value oil mass, and the sealing producing well continues pressurization infusion CO ₂To setting pressure, form maximization and bury solid CO ₂CO ₂The dispersive region rear enclosed injects well.