A Method to Identify Produced Water Type in Multilayered Loose Sandstone Gas Reservoirs in Middle and Late Production Stages

doi:10.7657/XJPG20200416

Abstract

Abstract:

Water breakthrough in gas wells is a common problem during the whole development process of multilayered loose sandstone gas reservoirs. In the middle and late production stages of gas reservoirs, the formation water become more complex due to the existence of multiple water such as invaded edge water, movable water transformed from irreducible water and channeling water. Based on the studies of sedimentary environment and gas reservoir forming mechanism, the paper analyzes the states of each type of water and studies the occurrences and characteristics of the produced water including condensate water, edge water, primary water, secondary water and interlayer water. The empirical condensate WGR formula is used to calculate the condensate WGR under different formation pressures in the middle and late production stages of gas reservoirs, and then the output of the produced condensate water can be calculated. Whether edge water is produced or not can be determined by using the well location and produced WGR and the edge water output can be obtained from the power correlation between WGR and water breakthrough time. An experiment of water displacement by gas is carried out and the irreducible water saturation of the cores with different mud contents are measured, movable water saturation is calculated from the water saturation of well logging, then the primary water/gas ratio and secondary water/gas ratio under different formation pressures can be determined and water yield within the layer is obtained. A water breakthrough experiment for mud interlayer is carried out to measure pressure differential for formation water breakthrough, then the critical formation water breakthrough pressures can be calculated for the interlayers with different shale contents and thicknesses by using Darcy’s formula, finally whether interlayer water is produced from a gas well can be judged by combining logging interpretation results and other water type determination data. Based on the identification results of the 5 produced water types, a model for produced water type identification is established for multilayered loose sandstone gas reservoirs in the middle and late production stages, and the output of each water type can be calculated. The study results are of important significance for strategy making of water drainage, water plugging, water blocking and control in multilayered loose sandstone gas reservoirs in the middle and late production stages.

Key words: Sebei No.2 gas field, multilayered loose sandstone gas reservoir, middle-late production stage, produced water type, water output, water source identification

CLC Number:

TE332

CHEN Fenjun, LIU Shiduo, CHAI Xiaoying, DENG Chengang, PANG Jin, TU Jiasha. A Method to Identify Produced Water Type in Multilayered Loose Sandstone Gas Reservoirs in Middle and Late Production Stages[J]. Xinjiang Petroleum Geology, 2020, 41(4): 491-498.

Figures/Tables 7

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Table 1

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序号	井名	日产气量/10⁴ m³	日产水量/m³	水气比/（10^-4 m³·m^-3）	气井出水构成/%
序号	井名	日产气量/10⁴ m³	日产水量/m³	水气比/（10^-4 m³·m^-3）	凝析水	层内次生可动水	层内原生可动水	边水	层间水
1	涩 4-0-1 井	0.04	6.71	49.00	0.04	8.16	0	91.80	0
2	涩 5-0-1 井	0.84	21.30	36.09	0.06	20.56	0	79.38	0
3	涩 6-0-1 井	1.94	0.61	0.33	5.77	94.23	0	0	0
4	涩 7-0-1 井	2.17	5.14	2.48	0.80	99.20	0	0	0
5	涩 R33-1 井	0.34	8.12	41.37	0.05	18.29	0	81.66	0
6	涩 R34-1 井	0.76	4.23	8.40	0.24	99.76	0	0	0
7	涩 R35-1 井	0.96	2.05	2.16	0.92	99.08	0	0	0
8	涩 R36-1 井	1.66	6.00	3.57	0.56	99.44	0	0	0
9	涩 R37-1 井	0.91	12.05	12.83	0.16	99.84	0	0	0
10	涩 R38-1 井	1.01	0.64	0.54	3.57	96.43	0	0	0
11	涩 R39-1 井	1.21	2.37	1.98	1.00	99.00	0	0	0
12	涩 R40-1 井	1.41	9.76	7.02	0.28	99.72	0	0	0
13	涩 R41-1 井	1.56	2.66	1.90	1.04	98.96	0	0	0
14	涩 R42-1 井	0.26	25.12	29.84	0.07	15.81	0	84.13	0
15	涩 R43-1 井	0.67	19.77	31.98	0.06	12.43	0	87.51	0
16	涩 R44-1 井	1.01	4.26	4.07	0.49	14.04	0	0	85.47
17	涩 R45-1 井	2.45	1.67	0.69	2.80	97.20	0	0	0
18	涩 R46-1 井	1.50	0.41	0.30	6.27	93.73	0	0	0
19	涩 R48-1 井	0.54	8.73	38.01	0.05	18.76	0	81.19	0