Abstract
A modular multiple thermal fluid generator is introduced to enhance heavy oil production, which consists of water treatment system, fuel injection system, air compressor, central burning and heat exchanging system, and measuring and controlling system. All the components are mounted in three separated light shelters, which are easy to be lifted and installed, especially on the offshore production platform. It could be operated under 350 ℃ and 20 MPa, and the temperature and GWR (ratio of the volume of gas to the equivalent water volume of steam under standard conditions) could be adjusted by the water injection rate under the given heating capability of the central burning chamber. The temperature of the generated fluid is usually 200–300 ℃ with GWR of 200–300 m3/m3. Compared to conventional steam generator, such compact multiple thermal fluid generator is easy to be installed on the offshore oil production platform, and the generated multiple thermal fluid is potential to enhance heavy oil production in mechanisms of reducing heavy oil viscosity by both heating and injected gas, enlarging the heating reservoir chamber, and pressure by injected gas. In the past 10 years, the multiple thermal fluid generator has been applied to more than 40 wells in Bohai Offshore Oilfield and Xinjiang Oilfield in cyclic multiple thermal fluid stimulation (CMTFS in short) process. As a result, the multiple thermal fluid generators were operated soundly, and the heavy oil production of these wells was enhanced remarkably. (The oil production rate was 2–3 times more than cold production.)
Highlights
Keywords Multiple thermal fluid generator · Cyclic steam and gas stimulation · Heavy oil · Field application. Steam injection processes such as CSS and SAGD are effective and used worldwide to enhance heavy oil production, the steam generator with large weight and volume is used to generate HTHP steam, and such conventional steam generator is difficult to be installed onto the offshore production platform (Zhong et al 2013; Wu et al 2016; Wang et al 2020a, b)
Steam injection processes such as cyclic steam stimulation (CSS in short) are not put into effect in past, and most heavy oil reservoirs in Bohai Oilfield are developed by cold production methods such as primary
The modular multiple thermal fluid generator was first introduced to heavy oil thermal recovery in the Bohai Offshore Oilfield, and a good effect of increasing production has been achieved
Summary
Steam injection processes such as CSS and SAGD are effective and used worldwide to enhance heavy oil production, the steam generator with large weight and volume is used to generate HTHP steam, and such conventional steam generator is difficult to be installed onto the offshore production platform (Zhong et al 2013; Wu et al 2016; Wang et al 2020a, b). Steam injection processes such as cyclic steam stimulation (CSS in short) are not put into effect in past, and most heavy oil reservoirs in Bohai Oilfield are developed by cold production methods such as primary. In 2010, multiple thermal fluid stimulation technique was introduced into the development of NB35-2 heavy oil block of Bohai Offshore Oilfield in China (Liu et al 2010, 2011; Sun et al 2011; Yu et al 2014; Han et al 2020). The modular multiple thermal fluid generator was first introduced to heavy oil thermal recovery in the Bohai Offshore Oilfield, and a good effect of increasing production has been achieved
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