High-pressure capacity expansion and water injection mechanism and indicator curve model for fractured-vuggy carbonate reservoirs
Lixin Chen,
Chengzao Jia,
Rujie Zhang,
Ping Yue,
Xujian Jiang,
Junfang Wang,
Zhou Su,
Yun Xiao,
Yuan Lv
Affiliations
Lixin Chen
Institute of Unconventional Oil and Gas Science and Technology, China University of Petroleum (Beijing), Beijing, 102249, China; State Key Laboratory of Reservoir Geology and Development, Southwest Petroleum University, Chengdu, 610500, China; Tarim Oilfield Company, PetroChina, Korla, 841000, China
Chengzao Jia
Institute of Unconventional Oil and Gas Science and Technology, China University of Petroleum (Beijing), Beijing, 102249, China
Rujie Zhang
State Key Laboratory of Reservoir Geology and Development, Southwest Petroleum University, Chengdu, 610500, China
Ping Yue
Institute of Unconventional Oil and Gas Science and Technology, China University of Petroleum (Beijing), Beijing, 102249, China; State Key Laboratory of Reservoir Geology and Development, Southwest Petroleum University, Chengdu, 610500, China; Corresponding author.
Xujian Jiang
Tarim Oilfield Company, PetroChina, Korla, 841000, China
Junfang Wang
Tarim Oilfield Company, PetroChina, Korla, 841000, China
Zhou Su
Tarim Oilfield Company, PetroChina, Korla, 841000, China
Yun Xiao
Tarim Oilfield Company, PetroChina, Korla, 841000, China
Yuan Lv
State Key Laboratory of Reservoir Geology and Development, Southwest Petroleum University, Chengdu, 610500, China
Water injection for oil displacement is one of the most effective ways to develop fractured-vuggy carbonate reservoirs. With the increase in the number of rounds of water injection, the development effect gradually fails. The emergence of high-pressure capacity expansion and water injection technology allows increased production from old wells. Although high-pressure capacity expansion and water injection technology has been implemented in practice for nearly 10 years in fractured-vuggy reservoirs, its mechanism remains unclear, and the water injection curve is not apparent. In the past, evaluating its effect could only be done by measuring the injection-production volume. In this study, we analyze the mechanism of high-pressure capacity expansion and water injection. We propose a fluid exchange index for high-pressure capacity expansion and water injection and establish a discrete model suitable for high-pressure capacity expansion and water injection curves in fractured-vuggy reservoirs. We propose the following mechanisms: replenishing energy, increasing energy, replacing energy, and releasing energy. The above mechanisms can be identified by the high-pressure capacity expansion and water injection curve of the well HA6X in the Halahatang Oilfield in the Tarim Basin. By solving the basic model, the relative errors of Reservoirs I and II are found to be 1.9% and 1.5%, respectively, and the application of field examples demonstrates that our proposed high-pressure capacity expansion and water injection indicator curve is reasonable and reliable. This research can provide theoretical support for high-pressure capacity expansion and water injection technology in fracture-vuggy carbonate reservoirs.
