Horizontal Well Infilling and Water Flooding Tracking Adjustment for Production Increase in Low Permeability Reservoirs in X Oilfield

doi:10.7657/XJPG20230509

Abstract

Abstract:

In X oilfield, the reservoirs exhibit poor physical properties, a small number of layers vertically, and the presence of small faults in complex distribution, which lead to poor effect of vertical well development and ineffecient displacement of the existing well pattern. Based on the successful development of pre-existing horizontal wells and infilled horizontal wells in the pilot test in 2014, a study was conducted on horizontal well infilling and tracking adjustment techniques in the areas with inefficient waterflooding by vertical wells and in the unswept areas near fault zones. Through logging-seismic combination and comprehensive dynamic-static analysis, the areas with stable reservoirs, low water-out risk, and enriched remaining oil were identified for well infilling. By optimizing the orientation and horizontal section length of horizontal wells, the fracturing density and fracture length were optimized to enhance the productivity of horizontal wells. The injection-production process was optimized by implementing the waterflooding tracking adjustment strategy of early-stage intermittent water injection and weak injection via the injector in an adjacent row + strong injection via the injector in a row apart. Following these approaches, a total of 19 infilling horizontal wells were drilled in the X oilfield in 2019, achieving a sandstone-encountered rate of 83.0%. The initial daily oil production per well reached 7.4 t, with a comprehensive water cut of 28.8%. An effective displacement system was established, resulting in an increase in the oilfield’s production rate from 0.8% to 1.5%, and improving the overall development effect of X oilfield.

Key words: low permeability reservoir, fine description, remaining oil, logging-seismic combination, dynamic-static analysis, infilling horizontal well, fracturing, water injection adjustment

CLC Number:

TE341

ZHOU Jiamei. Horizontal Well Infilling and Water Flooding Tracking Adjustment for Production Increase in Low Permeability Reservoirs in X Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(5): 577-582.

Figures/Tables 6

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位置	风险级别	水驱前缘与裂缝距离/m	累计注水强度/（m³·m^-1）	注水周期	配注强度/ （m³·d^-1·m^-1）
邻排	高风险区	<100	>1 000	间注关井
	次高风险区	100~150	>2 000	开7天关30天	1.0~1.2
	中风险区	150~200	>3 000	开1个月关3个月	1.2~1.4
	低风险区	其他范围	其他范围	开1个月关2个月	1.4~1.6
隔排	次高风险区	200~250	>4 000	开2个月关1个月	1.6~1.7
	中风险区	250~300	>6 000	开3个月关1个月	1.7~1.9
	低风险区	>300	>7 000	开6个月关1个月	1.9~2.1
	无风险区	其他范围	其他范围	连续注水	2.1~2.3