JP3224702B2 - Oil extraction method from oil field - Google Patents
Oil extraction method from oil fieldInfo
- Publication number
- JP3224702B2 JP3224702B2 JP30064894A JP30064894A JP3224702B2 JP 3224702 B2 JP3224702 B2 JP 3224702B2 JP 30064894 A JP30064894 A JP 30064894A JP 30064894 A JP30064894 A JP 30064894A JP 3224702 B2 JP3224702 B2 JP 3224702B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- carbon dioxide
- dioxide gas
- gas
- membrane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Extraction Or Liquid Replacement (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、油田から原油を取出す
方法として、加圧した炭酸ガスを油田に圧入して、油分
を炭酸ガス中に溶解させて一緒に取出す油田からの採油
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extracting crude oil from an oil field, in which pressurized carbon dioxide gas is injected into the oil field, the oil is dissolved in the carbon dioxide gas, and the oil is extracted together.
【０００２】[0002]
【従来の技術】加圧した炭酸ガスを油田に圧入し、炭酸
ガスに溶解した油分を炭酸ガスに同伴させて取出し、こ
れから油分を分離するようにした採油方法（ＥＯＲ方
法）は既に知られている。2. Description of the Related Art There is already known an oil extraction method (EOR method) in which pressurized carbon dioxide gas is injected into an oil field, an oil component dissolved in the carbon dioxide gas is taken out together with the carbon dioxide gas, and the oil component is separated therefrom. I have.
【０００３】この採油方法において油田から取出された
炭酸ガスに溶解した油分を分離する方法としては、一般
的に約１４０kg/cm2の高圧から圧力を減圧して、炭酸ガ
ス中に溶解している油分を分離するのが従来のやり方で
あった。こうして溶解油分を分離した後の炭酸ガスは再
度加圧して循環使用する。[0003] As a method for separating oil dissolved in carbon dioxide gas extracted from an oil field in this oil extraction method, the pressure is generally reduced from a high pressure of about 140 kg / cm 2 to dissolve the oil in the carbon dioxide gas. Conventional practice has been to separate the oil. The carbon dioxide gas after separating the dissolved oil content is pressurized again and reused.
【０００４】[0004]
【発明が解決しようとする課題】前述した従来の方法に
は次のような問題点がある。 （１）溶解した油分を分離するために減圧した炭酸ガス
を再度加圧するのに高圧ポンプが必要である。 （２）従来のやり方では、加圧と減圧を繰り返えしてい
てその圧力変化が大きいため、エネルギ効率が低い。The above-mentioned conventional method has the following problems. (1) A high-pressure pump is required to repressurize the decompressed carbon dioxide gas in order to separate the dissolved oil. (2) In the conventional method, pressurization and depressurization are repeated, and the pressure change is large, so that the energy efficiency is low.
【０００５】本発明は、加圧した炭酸ガスを油田に圧入
して油分を炭酸ガスに溶解させて一緒に取出す採油方法
におけるエネルギ効率を高めることを課題としている。[0005] It is an object of the present invention to improve the energy efficiency of an oil extraction method in which pressurized carbon dioxide gas is injected into an oil field to dissolve the oil component in the carbon dioxide gas and take it out together.
【０００６】[0006]
【課題を解決するための手段及び作用】本発明は、前記
した課題を解決するため、炭酸ガスの圧力変化を小さく
する。そのために本発明では以下の手段を採用する。 （１）油分と炭酸ガスの分離効率が高い分離膜を使用す
る。 （２）分離した炭酸ガスを循環使用するために、炭酸ガ
スを透過しにくい膜を使用することにより、炭酸ガスの
圧力低下を防止する。現在、一般的に炭酸ガスの分離に
使用されている分離膜の例としては、表１のものがあ
る。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention reduces the pressure change of carbon dioxide gas. For this purpose, the present invention employs the following means. (1) Use a separation membrane having a high efficiency of separating oil and carbon dioxide. (2) In order to circulate and use the separated carbon dioxide gas, a pressure drop of the carbon dioxide gas is prevented by using a membrane that does not easily transmit the carbon dioxide gas. Table 1 shows an example of a separation membrane generally used for carbon dioxide gas separation at present.
【０００７】炭酸ガスと油分の混合物に対して、従来の
分離膜は油分よりも炭酸ガスの方を透過しやすい。従っ
て、炭酸ガスは、分離膜を透過した後、圧力が低下す
る。その結果、炭酸ガスを循環して使用するときは再度
加圧する必要がある。A conventional separation membrane permeates a mixture of carbon dioxide and oil more easily than carbon dioxide. Therefore, the pressure of the carbon dioxide gas decreases after passing through the separation membrane. As a result, when circulating and using carbon dioxide, it is necessary to pressurize again.
【０００８】一方、本発明による採油方法で使用できる
分離膜の例としては、ポリイミド非対称膜（J.Membrane
Sci.,84(1993)185 参照) がある。この分離膜は、油分
を選択的に透過し、炭酸ガスは透過しにくい。On the other hand, as an example of a separation membrane that can be used in the oil collecting method according to the present invention, a polyimide asymmetric membrane (J. Membrane
Sci., 84 (1993) 185). This separation membrane selectively permeates oil, and hardly permeates carbon dioxide.
【０００９】例えば、炭酸ガスに比べてイソーオクタン
（Ｃ8 Ｈ18）の透過速度の方が大きく、分離係数は約８
が得られている。従って、炭酸ガスはこの分離膜を透過
しないので、圧力低下は配管での圧損程度で、せいぜい
１kg/cm2程度の加圧能力のポンプを使用するだけで十分
循環使用できる。For example, the permeation rate of iso-octane (C 8 H 18 ) is higher than that of carbon dioxide, and the separation factor is about 8
Has been obtained. Therefore, since carbon dioxide does not permeate through the separation membrane, the pressure drop is about the pressure drop in the piping, and it can be sufficiently circulated only by using a pump having a pressurizing capacity of at most about 1 kg / cm 2 .
【００１０】このように本発明の方法によれば油分を選
択的に透過する分離膜を用いることにより高いエネルギ
効率で油田から採油することが可能となる。As described above, according to the method of the present invention, it is possible to extract oil from an oil field with high energy efficiency by using a separation membrane that selectively permeates oil.
【００１１】[0011]
【表１】 [Table 1]
【００１２】[0012]
【実施例】以下、本発明の採油方法の実施態様を図１を
用いて説明する。図１において、１はＣＯ2 圧入井、２
は油田、３は噴出井を示している。４は油水分離器、５
はフィルタである。６は油分のみ選択的に透過する非対
称ポリイミド膜を用いた膜分離装置を示している。９は
気液分離器、１２はコンプレッサである。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the oil collecting method of the present invention will be described below with reference to FIG. In FIG. 1, 1 is a CO 2 injection well, 2
Indicates an oil field and 3 indicates a well. 4 is an oil-water separator, 5
Is a filter. Reference numeral 6 denotes a membrane separation device using an asymmetric polyimide membrane which selectively permeates only oil. 9 is a gas-liquid separator, and 12 is a compressor.
【００１３】図１において、ガス圧入井１から供給され
た炭酸ガスを主体とするガスは、油田２中の油分を溶解
して、自圧により噴出井３から地上に噴出し、油水分離
器４に導入される。ここで水分を除去した後、フィルタ
５を経て、膜分離装置６に導入される。In FIG. 1, a gas mainly composed of carbon dioxide supplied from a gas injection well 1 dissolves an oil component in an oil field 2, and is jetted to the ground from an injection well 3 by its own pressure. Will be introduced. After removing the water, the water is introduced into the membrane separation device 6 through the filter 5.
【００１４】この膜分離装置６で使用されている非対称
ポリイミド膜は、油分のみを選択的に透過するため、炭
酸ガス及び軽質炭化水素ガス（ＣＨ4 ，Ｃ2 Ｈ4 ，Ｃ2
Ｈ6など）はその分離膜をほとんど透過せずにライン７
から超臨界圧ポンプ８に導かれ、このポンプにより１４
０kg/cm2に加圧された後、再度ガス圧入井１から油田２
に供給される。Since the asymmetric polyimide membrane used in the membrane separation device 6 selectively permeates only oil, carbon dioxide gas and light hydrocarbon gas (CH 4 , C 2 H 4 , C 2)
H 6, etc.) Line 7 with little transmitted through the separation membrane
From the pump to a supercritical pressure pump 8, which pump
After being pressurized to 0 kg / cm 2 , gas injection well 1 to oil field 2 again
Supplied to
【００１５】一方、膜分離装置６で分離された油分は、
気液分離器９で分離膜をリークした若干の炭酸ガスと分
離され、ライン１０から油として抜き出される。On the other hand, the oil separated by the membrane separation device 6 is:
In the gas-liquid separator 9, the gas is separated from a small amount of carbon dioxide gas leaking from the separation membrane, and is extracted from the line 10 as oil.
【００１６】一方、リークした炭酸ガスは、ライン１１
を経て、コンプレッサ１２で加圧された後、ライン１３
を経てガス圧入井１に循環使用される。次に、本発明の
具体的な実施例をあげ、本発明の効果をより明らかにす
る。On the other hand, the leaked carbon dioxide gas
After being pressurized by the compressor 12 through the line 13
Through the gas injection well 1. Next, specific examples of the present invention will be described to further clarify the effects of the present invention.
【００１７】（実施例）模擬液を使用して、膜分離性能
を試験した。(Example) Using a simulated liquid, membrane separation performance was tested.
【００１８】（１）使用した分離膜：ポリイミド非対称
膜（J.Membrane Sci.,84(1993)185記載の膜）。(1) Separation membrane used: polyimide asymmetric membrane (membrane described in J. Membrane Sci., 84 (1993) 185).
【００１９】（２）炭酸ガス溶解模擬原料の組成：ＣＯ
2 …８４．１、ＣＨ4 …５．６、Ｃ 2 Ｈ6 …１．５、Ｃ
4 …１．８、Ｃ5 + …６．０（Ｃ5 + ：炭素数５以上の
炭化水素）。(2) Composition of carbon dioxide gas simulating raw material: CO
Two... 84.1, CHFour... 5.6, C TwoH6... 1.5, C
Four... 1.8, CFive +... 6.0 (CFive +: Having 5 or more carbon atoms
hydrocarbon).
【００２０】（３）試験条件：圧力…１３９kg/cm2、温
度…１５０℃。(3) Test conditions: pressure: 139 kg / cm 2 , temperature: 150 ° C.
【００２１】（４）試験結果：分離膜の液透過速度…
１．０８×１０-4（Ncm3/cm2・sec ・cmHg) 、分離係数
α…（ＹＣ5 ＋／ＹＣＯ）／（ＸＣ5 ＋／ＸＣＯ）＝
７．９。(4) Test result: liquid permeation rate of separation membrane ...
1.08 × 10 −4 (Ncm 3 / cm 2 · sec · cmHg), separation coefficient α ... (YC 5 + / YCO) / (XC 5 + / XCO) =
7.9.
【００２２】ここで、Ｙ：透過物中の分率、Ｘ：原料中
の分率、ＹＣＯ＝ＹＣＯ2 ＋ＹＣＨ 4 ＋ＹＣ2 ＋Ｙ
Ｃ4 。前述の結果から、炭酸ガス及び軽質炭化水素と油
分を高性能で分離することができた。Here, Y: fraction in permeate, X: in raw material
Fraction, YCO = YCOTwo+ YCH Four+ YCTwo+ Y
CFour. From the above results, it was found that carbon dioxide, light hydrocarbons and oil
Minutes could be separated with high performance.
【００２３】[0023]
【発明の効果】以上説明したように、本発明の採油方法
によれば油分を選択的に透過する分離膜を用いることに
より、油田から炭酸ガスに同伴して取出された油分を分
離する際の圧力降下を少くすることができる。従って、
油田から油分を伴って出て来た炭酸ガスから油分を分離
したあと、その炭酸ガスを効率的に再使用することがで
きる。As described above, according to the oil collecting method of the present invention, by using the separation membrane which selectively permeates the oil, the oil used for separating the oil removed from the oil field with the carbon dioxide gas can be separated. The pressure drop can be reduced. Therefore,
After separating the oil component from the carbon dioxide gas that accompanied the oil component from the oil field, the carbon dioxide gas can be reused efficiently.
【００２４】こうして本発明によれば、加圧した炭酸ガ
スを油田に圧入して油分を炭酸ガス中に溶解させて一緒
に取出す採油方法におけるエネルギ効率を高めることが
できる。Thus, according to the present invention, it is possible to increase the energy efficiency in the oil extraction method in which the pressurized carbon dioxide gas is injected into the oil field to dissolve the oil component in the carbon dioxide gas and take it out together.
【図１】本発明による油田からの採油方法の実施の一態
様を示す説明図。FIG. 1 is an explanatory view showing one embodiment of a method for extracting oil from an oil field according to the present invention.
１ ＣＯ2 圧入井 ２ 油田 ３ 噴出井 ４ 油水分離器 ５ フィルタ ６ 膜分離装置 ８ 超臨界圧ポンプ ９ 気液分離器 １２ コンプレッサ1 CO 2 injection well 2 oilfield third nozzle well 4 oil-water separator 5 filter 6 membrane separator 8 supercritical pressure pump 9 the gas-liquid separator 12 compressor
Claims (1)
ガスに溶解した油分を炭酸ガスに同伴させて取出し、こ
れから油分を選択的に透過する分離膜により油分を分離
し、前記分離膜を透過しない炭酸ガスを主成分とするガ
スを、加圧したのち油田に再度循環使用することを特徴
とする油田からの採油方法。1. A pressurized carbon dioxide gas is injected into an oil field, an oil component dissolved in the carbon dioxide gas is taken out with the carbon dioxide gas, and the oil component is separated therefrom by a separation membrane selectively permeating the oil component. A method for recovering oil from an oil field, comprising pressurizing a gas mainly composed of carbon dioxide that does not pass through the oil field and then circulating the gas to the oil field again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30064894A JP3224702B2 (en) | 1994-12-05 | 1994-12-05 | Oil extraction method from oil field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30064894A JP3224702B2 (en) | 1994-12-05 | 1994-12-05 | Oil extraction method from oil field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08158774A JPH08158774A (en) | 1996-06-18 |
| JP3224702B2 true JP3224702B2 (en) | 2001-11-05 |
Family
ID=17887392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30064894A Expired - Fee Related JP3224702B2 (en) | 1994-12-05 | 1994-12-05 | Oil extraction method from oil field |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3224702B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1837068B1 (en) | 2001-08-28 | 2010-10-06 | Mitsubishi Rayon Co., Ltd. | Method and device for manufacturing artificial carbonated spring water |
| CN101169033A (en) * | 2006-10-27 | 2008-04-30 | 株式会社安川电机 | Oil extracting system and oil extraction monitoring system |
| KR100937212B1 (en) * | 2009-04-29 | 2010-01-20 | 주식회사 에이쓰 | Crude oil extraction devices |
| CN102606069B (en) * | 2012-04-01 | 2013-04-10 | 中国石油大学(华东) | Control device for phases in wellbore of supercritical carbon dioxide drilled well |
| KR101507226B1 (en) * | 2013-06-05 | 2015-03-30 | 현대중공업 주식회사 | Dual pipe system for high productivity of undersea plant |
| WO2024024837A1 (en) * | 2022-07-26 | 2024-02-01 | 株式会社Inpex | Method and equipment for reducing flare gas, and method and equipment for reducing disposal amount of biogas |
-
1994
- 1994-12-05 JP JP30064894A patent/JP3224702B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08158774A (en) | 1996-06-18 |
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