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Research and Application of Low Temperature Thermochemistry Mechanism on Offshore Heavy Oil
Liu Yigang, Song Hongzhi, Zou Jian, Zhou Fayuan, Sun Yubao
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466
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The development of heavy oil field encounters such problems as steam channeling, water cut rising, and a large number of low production and low efficiency wells. In view of the existing problems, this paper proposed low temperature thermochemistry technique. The chemical system (sulfonate chemical system L⁃B) was developed independently and adapted to the offshore heavy oil field, which was used to synergize the thermal effect of low temperature steam, so as to reduce the cost and increase the efficiency of oil displacement and improve the efficiency of oil displacement. The static oil washing efficiency of the chemical system is 28.7%. The interfacial tension between crude oil and chemical system is 0.086 mN/m at 56 ℃, which is 99.3% lower than that between crude oil and formation water. The displacement efficiency can reach 65.00% at 120 ℃, which is 8.50% higher than that of steam flooding at the same temperature and achieved the steam injection effect at 200 ℃.After the application on an oilfield in Bohai Sea,the maximum daily oil production of a single well can reach 32 m3, increasing 52.4%. Low temperature thermochemical technique has certain guidance and reference significance for enhancing oil recovery of offshore heavy oil field.
2020, 33 (3): 27-30.
DOI:
10.3969/j.issn.1006-396X.2020.03.005
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Study on Plugging and Displacement of Large⁃Size Advantage Channel in Bohai Oilfield
Meng Xiangha,Zhang Yunbao,Xia Huan,Liu Yigang,Wang Wei,Lü Jinlong,Yin Qingguo
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570
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In order to solve the technical problem of injected fluid channeling in offshore oilfields,the basic performance evaluation of plugging agent,core hole plugging rate and the large⁃scale dominant channel treatment experiment of "plugging + profile control" oil increase and precipitation effect was carried out in Bohai reservoir. The results show that the blocking rate of blocking agent for large⁃scale dominant channel is higher than 90%,which indicates that it can meet the technical requirements of blocking large⁃scale dominant channel in Bohai reservoir.Combining the large⁃scale dominant channel plugging technology with chemical profile control and flooding technology,the dual effects of macro and micro fluid flow diversion can be obtained,and the effect of oil increase and precipitation is very obvious.Compared with hydrophobically associating polymer solution,although the viscosity of Cr3+ polymer gel is relatively low,the polymer molecular aggregates in Cr3+ polymer gel have "intramolecular" cross⁃linking structure characteristics,and have better compatibility with reservoir pores,which can establish an effective displacement pressure gradient in deep core,resulting in better fluid diversion effect and larger recovery.
2019, 32 (4): 44-51.
DOI:
10.3969/j.issn.1006-396X.2019.04.008
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Profile Control and Flooding Effect of Alternate Injection of Cr3+
Polymer Gel and Water and Its Mechanism Analysis:
Taking the Bohai Oilfield as an Example
Zhang Baoyan, Lu Xiangguo, Xie Kun, Liu Yigang, Zhang Yunbao
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305
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Aiming at technical demand on relieving the reverse of imbibition profile, displacement effect of alternate injection of Cr3+
polymer gel and water was studied, taking reservoir of Bohai oilfield as simulation object, regarding injection pressure, water content and recovery efficiency as evaluation index. Results showed that as the displacement agent flowed into the medium and low permeability layer, on the one hand, the swept volume was magnified. On the other hand, seepage resistance and start
up pressure of imbibition were increased, thus resulting in the reverse of the imbibition profile. Once the alternate injection of Cr3+
polymer gel and water was adopted, polymer solution could get priority to flow into the high permeable layer and block off it, then subsequent water flowed into medium and low permeability layers to displace the oil. Therefore the phenomenon of the reverse of imbibition profile was relieved or even eliminated. Once the alternate injection of C3+
polymer gel and water was conducted in A22 injection well in LD5
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2 Oilfield, injection pressure get increased, which was good for enlarging sweep volume effect.
2016, 29 (1): 35-40.
DOI:
10.3969/j.issn.1006-396X.2016.01.007