Productivity Prediction in Different Stages of Collaborative Construction of Underground Gas Storage and Gas Flooding

doi:10.7657/XJPG20220513

Abstract

Abstract:

In different stages of the collaborative construction of underground gas storage (UGS) and gas flooding, the produced gas-oil ratio (GOR) varies greatly, and the complex oil, gas and water three-phase flow occurs in several stages. Currently, the multiphase productivity of UGS is generally calculated by converting oil production to gas equivalent, which produces relatively large errors. On the basis of the three-phase flow differential equation, the three-phase pseudo pressures of oil, gas and water were introduced, and a three-phase flow productivity calculation method considering the influence of high-speed non-Darcy flow of gas was established. With the help of this method, the oil phase productivity equation, gas phase productivity equation, and inflow performance relationship (IPR) curve in gas flooding stage, collaborative construction stage, and UGS stage were obtained and then compared with production data. The results show that the productivity calculated by the three-phase flow productivity calculation method is less than 6.16% in each of the three stages. When the production pressure difference is small, the calculation results from the traditional conversion method and the three-phase flow productivity calculation method are close. However, with the progress of construction, the error of the traditional conversion method becomes larger. The three-phase flow productivity calculation method is simple, accurate, and operable. It is of guiding significance for predicting the productivities in different stages of collaborative construction of UGS and gas flooding.

Key words: collaborative UGS, gas flooding, three-phase flow, productivity equation, pseudo pressure, inflow performance relationship curve

CLC Number:

TE319

YIN Fuguo, CHENG Shiqing, HUANG Lan, ZHANG Jianye, FAN Jiawei, ZHANG Liang. Productivity Prediction in Different Stages of Collaborative Construction of Underground Gas Storage and Gas Flooding[J]. Xinjiang Petroleum Geology, 2022, 43(5): 600-605.

Figures/Tables 6

Table 1.

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Table 2.

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井名	井底流压/ MPa	实测日产油量/m³	计算日产油量/m³	日产油量误差/%	实测日产气量/10⁴ m³	计算日产气量/10⁴ m³	日产气量误差/%
A1井	48.62	6.39	6.28	1.72	1.59	1.55	2.51
	44.01	9.14	9.07	0.76	2.28	2.24	1.75
	41.92	12.33	11.86	3.81	3.08	2.79	6.16
	37.81	13.23	13.26	0.22	3.31	3.28	0.90
	36.21	13.61	13.96	2.57	3.40	3.45	1.47
A2井	36.41	40.01	41.92	4.55	2.47	2.58	4.30
	35.92	41.33	42.23	2.13	2.50	2.62	4.55
	35.11	42.43	42.54	0.26	2.66	2.75	3.44
	34.32	43.11	43.35	0.56	2.84	2.82	0.88
	33.21	48.23	47.16	2.26	2.93	3.06	3.90
A3井	42.21	12.68	12.32	2.94	0.61	0.59	1.80
	41.82	15.87	15.64	1.49	0.63	0.61	1.82
	41.31	16.00	15.95	0.29	0.65	0.62	5.19
	40.92	16.52	16.27	1.53	0.68	0.64	4.91
	40.21	16.91	16.58	1.93	0.73	0.69	4.86