Enhanced Recovery in Middle and Late Stages of Depletion Development of Condensate Gas Reservoirs With Oil Ring

doi:10.7657/XJPG20240411

Abstract

Abstract:

The depletion development of Y5 condensate gas reservoir in the Tarim basin encounters the challenges such as rapid decline in both reservoir pressure and well productivity, gradual decrease in produced gas-oil ratio, increase in condensate oil density and viscosity, and fast downgrading of development performance. Combining performance analysis and reservoir fluid component evaluation, the Y5 condensate gas reservoir was redefined as a layered condensate gas reservoir with oil ring and edge water and the thickness of the oil ring was determined through numerical simulation. To improve the development performance and enhance the condensate oil/gas recovery, a systematic investigation was conducted on the mechanism of enhanced recovery in the middle and late stages of depletion development of the condensate gas reservoir with oil ring. It is found that optimizing the well pattern and implementing cyclic gas injection can significantly improve oil and gas recovery. Gravity-assisted gas drive is recommended, with CO₂ being the optimal injection medium, followed by reservoir gas. Based on reservoir type and enhanced recovery mechanism, a scheme of cyclic gas injection for enhancing the recovery of Y5 condensate gas reservoir was developed, with an expected oil recovery 29.96% higher than that of depletion development alone. Under this scheme, a cumulative gas volume of 0.19×10⁸ m³ was injected, the reservoir pressure restored by 4.31 MPa, and the well productivity increased by 3.09 times compared to that before the scheme was implemented. The research results provide valuable reference for enhancing recovery in the middle and late development stages of similar reservoirs.

Key words: Tarim basin, condensate gas reservoir, oil ring, middle-late development stage, cyclic gas injection, EOR, development mechanism, gravity-assisted gas drive

CLC Number:

TE357

HUANG Zhaoting, LI Chuntao, WANG Bin, QIAO Xia, FU Ying, YAN Bingxu. Enhanced Recovery in Middle and Late Stages of Depletion Development of Condensate Gas Reservoirs With Oil Ring[J]. Xinjiang Petroleum Geology, 2024, 45(4): 470-474.

Figures/Tables 6

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特征参数	不同等级范围
特征参数	0	1	2	3	4	5
F₁	>125	100~125	75~100	50~75	25~50	0~25
F₂	>10	8~10	6~8	4~6	2~4	0~2
F₃	>6	5~6	4~5	3~4	2~3	1~2
F₄	>5.3	4.3~5.3	3.3~4.3	2.3~3.3	1.3~2.3	0.3~1.3

方案	井数/口	日产气量/ 10⁴ m³	预测最终采收率/%
方案	井数/口	日产气量/ 10⁴ m³	油	气
1	2	2	26.40	52.62
2	3	3	27.13	54.43
3	4	4	28.17	56.03
4	5	5	29.58	58.23