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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0294629 (1981-08-20) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 333 인용 특허 : 5 |
In a section of an oil field a first and only bore hole (5) is drilled through the strata (3) carrying heavy oil until the underlying stratum (4) void of heavy oil and enlarged to a cavern-like collection chamber (9). Around this first bore hole (5) a plurality of second bore holes (6) are drilled t
In a section of an oil field a first and only bore hole (5) is drilled through the strata (3) carrying heavy oil until the underlying stratum (4) void of heavy oil and enlarged to a cavern-like collection chamber (9). Around this first bore hole (5) a plurality of second bore holes (6) are drilled through the strata (3) carrying heavy oil to the stratum (4) in a pattern comprising several circles. A further pattern of third bore holes (7) is drilled also in a circle-like pattern through the strata (5) carrying heavy oil, which third bore holes (7) are followed by drainage channels (8), which extend to the collecting chamber (9). By means of electrodes arranged in the second bore holes (6) the heavy oil strata are preheated and thereafter steam is injected through the same bore holes (6) in order to drive flowable heavy oil against the third bore holes (7). A solvent is injected from the third bore holes (7) into the cone-like heavy oil accumulation (18) and by means of a further injection of steam from the second bore holes (6) the heavy oil rendered flowable by the solvent is driven toward the third bore holes (7) such to flow into the collecting chamber (9) out of which it is finally pumped to the first bore hole (6).
Method of recovering underground oil in a selected region comprising the steps of forming a production well in such region, surrounded by injection wells, heating the oil, injecting pressurized fluid through said injection wells to drive oil in the region into a conical formation around the producti
Method of recovering underground oil in a selected region comprising the steps of forming a production well in such region, surrounded by injection wells, heating the oil, injecting pressurized fluid through said injection wells to drive oil in the region into a conical formation around the production well while closing off the production well to escape of oil, injecting cold solvent via the production well into a lower section of the conical formation and maintaining the formation intact to prevent escape of heat and allow thorough mixing of the solvent with the oil, heating the oil/solvent mixture and opening the production well and terminating solvent injection to allow escape of oil/solvent mixture through the production well.
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