A method for optimizing process parameters of natural gas mixed with dilute gas lift
A process parameter, natural gas technology
Active Publication Date: 2020-02-21
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, there are few reports at home and abroad on the research and application of natural gas lift and dilution technology for ultra-deep heavy oil reservoirs. Preliminary results have been achieved in the application, but due to difficulties such as imperfect geological understanding, high viscosity of heavy oil, and complex ground support, a systematic optimization method for process parameters has not been formed, resulting in large differences in the effects of test wells and lack of clear guidance
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[0074] The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples.
[0075] Well TK677 test situation (secret test)
[0076] Well TK677 is a development well in the shaft of the Akekule salient in the Tarim Basin. It was drilled on January 19, 2011 and completed on April 16, 2011. The designed well depth is 5650m (vertical), and the completed drilling depth is 5663m (vertical). , the drilled horizon O 1-2 y, There is no venting or leakage during the drilling process. After drilling, the PDP openhole packer was set at 5589.43m, and the O 1-2 The 5589.43-5663m well section of the y layer was sealed and acid fractured to complete the well. After the acid fracturing, the well was opened and self-sprayed, and the cumulative acid discharge was 52.5m 3 See oil, self-spray and build production.
[0077] On August 25, 2015, the 70 / 44 thickening pump string in the TK677 well group was pumped, and the...
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The invention relates to the field of oil and gas well development, in particular to a parameter optimization method of natural gas blending light gas-lift technology. The parameter optimization method comprises the following steps that (1) optimization of wellhead injection pressure is performed; (2) optimization of oil well mixed production is performed; and (3) the oil well mixed production andoil pressure are compared with earlier stage well selection requirements and actual working conditions on the site, if the site requirements are met, production can be continued under the injection gas-oil ratio and injection pressure conditions; and if the site requirements are not met, different injection gas-oil ratios are continuously set, and steps of phases (1) and (2) are recalculated. Theparameter optimization method of the natural gas blending light gas-lift technology can effectively improve the implementation effect of ultra-deep thick oil gas-lift blending light technology, and has broad application prospects.
Description
technical field [0001] The invention relates to the field of oil and gas well development, in particular to a method for optimizing process parameters of natural gas mixed with dilute gas lift. Background technique [0002] The fractured-vuggy reservoirs in Tahe Oilfield are large-scale marine sedimentary carbonate reservoirs. The reservoirs are mainly fractured-vuggy reservoirs. The development scale and shape of fracture-vugs are highly uncertain and highly heterogeneous. The production of heavy oil in Tahe Oilfield accounts for more than 50%. The nature of crude oil in the heavy oil block is complex, and the burial depth of the reservoir reaches 5500-6700m. Heavy oil has low viscosity under formation conditions and can flow smoothly into the wellbore. However, after flowing into the wellbore from the formation, the viscosity increases with the decrease of temperature and pressure, and it loses its flow ability at about 3,000 meters. It needs to be exploited by wellbore vi...
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IPC IPC(8): E21B43/25E21B43/12G06F17/15
CPCE21B43/122E21B43/255G06F17/15
Inventor 赵海洋刘宝增曹畅杨祖国任波刘磊王雷程仲富高定祥彭振华范伟东邢钰秦飞李勇冯轶刘超
Owner CHINA PETROLEUM & CHEM CORP