致密砂岩支撑裂缝气测导流能力研究

Abstract

Abstract:

After the guidance of the results of gas flow conductivity test for the optimization of fracturing design of tight gas reservoirs, the prediction of post fracturing effect and the optimization evaluation of proppant were more pertinent and reasonable. The current common gas flow conductivity tests mainly focused on the influence of the closure pressure, proppant particle size and proppant type on the flow conductivity. Based on the analysis, we designed the experimental scheme about the influence of fracturing fluid type and laying mode on gas flow conductivity by using the DL—2000 fracture support conductivity tester and according to the SY/T6302—1997 "proppant filling layer short-term conductivity evaluation and recommendation method". The results showed that the fracture conductivity decreases when the closure pressure increased; the larger the proppant diameter was, the greater the conductivity would be; while the greater the closure pressure was, the greater the decreasing amplitude of the flow conductivity would be. The laying mode for the rear gas logging fracture conductivity was the best. The fracturing fluid damage made the cracks in the gas logging diversion capacity decreased by 80 %~95 %.

Key words: supporting fractures, gas flow conductivity, permeability, fracturing fluid damage, paving methods

CLC Number:

TE357.2

He Siyuan,Zhao Liqiang,Luo Zhifeng,Li Jun,Li Hua. Study on indoor gas measurement of supporting fracture conductivity of tight sandstone[J].Reservoir Evaluation and Development, 2018, 8(6): 45-50.

Figures/Tables 11

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References 21

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支撑剂粒径	铺置方式	闭合压力/ MPa	承压时间/d	压裂液
20/40		7~70	短期
30/50		7~70	短期
40/70		7~70	短期
20/40、40/70	尾追	7~70	短期
20/40、30/50、40/70	组合	7~70	短期
20/40、40/70	脉冲	7~70	短期
20/40、40/70	尾追	42	15
20/40、30/50、40/70	组合	42	15
20/40、40/70	脉冲	42	15
20/40、40/70	尾追	7~70	短期	高黏胍胶压裂液
20/40、40/70	尾追	7~70	短期	EM60
20/40、40/70	尾追	7~70	短期	EM50
20/40、40/70	尾追	42	15	高黏胍胶压裂液
20/40、40/70	尾追	42	15	EM60
20/40、40/70	尾追	42	15	EM50

来源	离差平方和	自由度	均方离差	F值	显著性
修正的模型	39 344 826.103	42	936 781.574	10.763	0.000
截距	757 458.243	1	757 458.243	8.702	0.016
闭合压力	5 325 898.134	10	532 589.813	6.119	0.006
铺置方式	8 567 467.543	2	4 283 733.771	49.215	0.000
压裂液类型	23 050 651.840	3	7 683 550.613	88.275	0.000

Study on indoor gas measurement of supporting fracture conductivity of tight sandstone

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