CN103912250A - Novel crude oil recovery rate improving technology by adopting potential gas drive - Google Patents
Novel crude oil recovery rate improving technology by adopting potential gas drive Download PDFInfo
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- CN103912250A CN103912250A CN201310015915.5A CN201310015915A CN103912250A CN 103912250 A CN103912250 A CN 103912250A CN 201310015915 A CN201310015915 A CN 201310015915A CN 103912250 A CN103912250 A CN 103912250A
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- oil
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- gas drive
- oil recovery
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Abstract
The invention relates to a crude oil recovery technology, in particular to a novel crude oil recovery rate improving technology by adopting potential gas drive. The technology is that a chemical agent slug is injected into the stratum, and chemical agents perform chemical reaction in the stratum to generate N2 and CO2 for oil displacement. The novel crude oil recovery rate improving technology by adopting potential gas drive has the advantages of being low in cost and improving the crude oil recovery rate compared with other oil drive technologies.
Description
Technical field
The present invention relates to a kind of oil recovering technology, particularly relate to a kind of potential gas drive and improve oil recovery factor technology.
Background technology
At oil, supply falls short of demand in the situation that, the Efficient Development of oil seems more important.Oil field generally adopts from ground directly toward stratum note N at present
2, CO
2the method displacement of reservoir oil, people have confirmed N by a large amount of desk research and field trial
2, CO
2it is a kind of effectively oil displacement agent.But it is found that, directly note N from ground toward stratum
2, CO
2there is a lot of deficiencies and defect in gas drive oil, has restricted note N
2,cO
2gas drive oil tech is in the large-area popularization in China oil field, and its main restricting factor is to lack natural N
2, CO
2source, and N
2, CO
2conveying, to problems such as oil well and equipment corrosion, safety and environment.
To CO
2physicochemical properties research process in find, under specific temperature and pressure condition, CO
2gas meter reveals and chemical property different in conventional pressure and temperature situation.Under certain Temperature-pressure Conditions, both under strong compression and heating condition, CO
2the density of gas is that jump form is fierce increases by tens times, and density approaches liquid, and its viscosity is near the viscosity of gas, diffusion coefficient is liquid 100 times, thereby have surprising solvability.The gas of this state can be called " supercritical fluid ".(critical-temperature T in critical point
c=31.3 DEG C, critical pressure P
c=7.37Mpa), CO
2the variable density maximum of gas, its compressibility is the strongest, and the minor variations of pressure causes the great changes of density.Under super critical condition, CO
2more easily be dissolved in oil compared with natural gas.Can reduce viscosity of crude and displacement crude oil from stratum better as a kind of good solvent, in addition, vaporous CO
2can enter into the inaccessiable space of other solvents, be the desirable oil displacement agent in oilfield exploitation procedure.
Summary of the invention
The object of the invention is to design a kind of potential gas drive and improve oil recovery factor technology, this technology is to inject chemical agent slug to stratum, by these chemical agents, chemical reaction occurs in stratum, generates N
2, CO
2the displacement of reservoir oil.
Technical scheme of the present invention:
First carry out at water filling well group " multiple tracer inter-well test remaining oil saturation technology ", provide the distribution situation of remaining oil in the layer position of macropore and high permeability formation in this well group oil reservoir and oil reservoir, accomplish to know what's what, then carry out the spontaneous gas drive oil of oil reservoir Construction Scheme according to above-mentioned test achievement, on-the-spot injection order is as follows:
(1) in water injection well, inject temporarily stifled prepad fluid, macropore plugging;
(2) inject and release the angry combination solution of energy;
(3) note displacement fluid, can all head into releasing in pit shaft in oil reservoir by angry combination solution;
(4) closing well some hours opening well and making production again, makes to release and can the more abundant haptoreaction of angry combination solution generate N
2, CO2 gas, remaining oil in oil reservoir is driven and exploits out.
Superiority of the present invention: there is cost low compared with other technology of reservoir sweep, improve the high feature of oil recovery factor.
Detailed description of the invention
The reservoir temperature high (120 DEG C) of Dagang Oilfield branch company the 5th Gang Xiyou district of oil recovery factory deep layer well.Formation water salt content is high by (20 × 10
4mg/L), Dagang Oilfield Sheng Da Science and Technology Ltd. for detect temporary stifled prepad fluid release can angry combination solution in stratum the technical indicator of heatproof and salt tolerant, 5 water filling well groups in Gang Xiyou district in 2008 are implemented potential gas drive and are improved the effect that oil recovery factor technology all obtains, for example, injected 200m at Gang Xi room 19 wells
3block up temporarily prepad fluid and release the angry combination solution of energy, implement potential gas drive and improve oil recovery factor measure, after measure around producing well all raising in various degree oil production, as western 26-8H than measure before 5.5 tons/day of incremental oil productions, western 24-6H than measure before 4.38 tons/day of incremental oil productions.Effect is fine, illustrates that blocking up temporarily prepad fluid releases the angry combination solution of energy in 120 DEG C of temperature, formation water salt content 20 × 10
4in the stratum of mg/L, successfully generate CO
2gas, drives remaining oil.Having confirmed to block up temporarily prepad fluid releases and can reach 120 DEG C of heatproofs by angry combination solution.Salt tolerant 20 × 10
4the technical indicator of mg/L, customers' responsiveness is good.
Claims (1)
1. a potential gas drive improves oil recovery factor technology, it is characterized in that: first carry out at water filling well group " multiple tracer inter-well test remaining oil saturation technology ", provide the distribution situation of remaining oil in the layer position of macropore and high permeability formation in this well group oil reservoir and oil reservoir, accomplish to know what's what, then carry out the spontaneous gas drive oil of oil reservoir Construction Scheme according to above-mentioned test achievement, on-the-spot injection order is as follows:
(1) in water injection well, inject temporarily stifled prepad fluid, macropore plugging;
(2) inject and release the angry combination solution of energy;
(3) note displacement fluid, can all head into releasing in pit shaft in oil reservoir by angry combination solution;
(4) closing well some hours opening well and making production again, makes to release and can the more abundant haptoreaction of angry combination solution generate N
2, CO2 gas, remaining oil in oil reservoir is driven and exploits out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310015915.5A CN103912250A (en) | 2012-12-31 | 2012-12-31 | Novel crude oil recovery rate improving technology by adopting potential gas drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310015915.5A CN103912250A (en) | 2012-12-31 | 2012-12-31 | Novel crude oil recovery rate improving technology by adopting potential gas drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103912250A true CN103912250A (en) | 2014-07-09 |
Family
ID=51038215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310015915.5A Pending CN103912250A (en) | 2012-12-31 | 2012-12-31 | Novel crude oil recovery rate improving technology by adopting potential gas drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103912250A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114605983A (en) * | 2022-03-21 | 2022-06-10 | 中海油田服务股份有限公司 | High-efficiency heat generation chemical agent and using method and application thereof |
-
2012
- 2012-12-31 CN CN201310015915.5A patent/CN103912250A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114605983A (en) * | 2022-03-21 | 2022-06-10 | 中海油田服务股份有限公司 | High-efficiency heat generation chemical agent and using method and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140709 |