Research and Application of a New Method for Dynamic Diagnosis of Gas-Cap Reservoirs

doi:10.7657/XJPG20240509

Abstract

Abstract:

During the development of gas-cap reservoirs, crude oil, dissolved gas, gas-cap gas, condensate oil, and formation water may be produced simultaneously. Accurately calculating formation pressure and recovery percent of each phase is crucial for dynamic diagnosis and potential tapping of remaining oil and gas in such reservoirs. Current methods for calculating formation pressure fail to take water invasion into consideration, leading to uncertainty in production splitting, which increases the risks in subsequent adjustment and potential tapping. Through water influx fitting and Newton iteration methods, a new method for dynamic diagnosis of gas-cap reservoirs based on water invasion characteristic analysis and average formation pressure prediction was established. The application of this method in the Y3 gas-cap reservoir in the M oilfield indicates that crude oil and condensate oil account for 89.7% and 10.3% in the produced oil, respectively, and the produced gas contains 97.9% gas-cap gas and only 2.1% dissolved gas. The recovery efficiency of gas-cap gas and condensate oil is as high as 46.6% and 31.2%, respectively, while the recovery efficiency of crude oil and dissolved gas is merely 12.1% and 1.7%, respectively. These results are consistent with production test results.

Key words: gas-cap reservoir, dynamic diagnosis, water invasion, average formation pressure, phase partitioning, remaining oil and gas potential tapping

CLC Number:

TE372

WU Ruidong, WANG Rui, MA Lian, ZHANG Chunguang, SONG Gangxiang, SHI Meixue, LU Ying. Research and Application of a New Method for Dynamic Diagnosis of Gas-Cap Reservoirs[J]. Xinjiang Petroleum Geology, 2024, 45(5): 574-580.

Figures/Tables 9

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Table 2.

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生产时间/d	实测压力/MPa	水侵量/10⁴ m³
0	27.0	0
543	24.5	58
645	23.9	55
829	23.4	62
1 412	23.0	89
2 254	21.5	118
2 346	21.0	122
2 741	20.6	141

参数	X4气藏	Q1气藏
埋深/m	3 080.70	1 863.55
地层倾角/（°）	6~10	1~3
气顶指数	4.7	2.6
气顶有效厚度/m	19.8	10.2
底油有效厚度/m	6.2	3.4
水体类型	底水（估算30倍）	底水（偏刚性）
凝析油含量/（cm³·m^-3）	418	242
井型	定向井，射孔段中深位于气油界面	水平井
开发策略	初始射开气2 m，油1 m，油气同采，目前为气顶高部位布井，采气为主	气顶布井，采气为主
计算地层压力/MPa	23.79	18.36
实测地层压力/MPa	23.85	18.32
原油采出程度/%	5.7	0.9
天然气采出程度/%	35.1	37.6