致密储层水平井重复压裂技术优化

Abstract

Abstract:

In order to improve the refracturing effects of the tight reservoirs and the economic benefits, we provided the optimization methods for the well and layer selection and fracturing design in the refracturing process of the tight wells: the multi-level fuzzy comprehensive evaluation method and artificial neural network method were applied to study the influence of the geological and engineering factors on the refracturing effect, so that the well and layer selection criteria of refracturing for the horizontal wells in tight reservoirs could be determined. The stress field variation and fracture extension rule were studied, and the fracturing material for tight reservoirs was provided. Based on the field production data, 3D fracturing simulation software was used to optimize the refracturing parameters of 3 target horizontal wells. The studying results can scientifically guide the application of refracturing technology in tight reservoir wells.

Key words: tight reservoir, refracturing, horizontal well

CLC Number:

TE357

Song Liyang,Wang Jiwei,Li Fengxia,Liu Changyin,Su Jianzheng,Zhang Rusheng. Optimization of horizontal well refracturing technology in tight reservoirs[J].Reservoir Evaluation and Development, 2018, 8(4): 63-67.

Figures/Tables 9

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References 18

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重复压裂建议	渗透率/10^-3μm²	有效厚度/m	累产油量/m³	目前日产油量/m³	孔隙度,%	含水饱和度,%
建议	>0.8	>30	6 900~13 500	<50	>10	<45
可行	0.4~0.8	20~30	300~6 900	50~200	7~10	45~55
不建议	<0.4	<20	<300	>200	<7	>55

储层特征	裂缝形态	压裂液类型	支撑剂类型
塑性	单一裂缝	交联液、高黏压裂液	大粒径支撑剂
中等脆性	主峰+部分次生缝	混砂液	大粒径支撑剂（主缝）+小粒径支撑剂（次生缝）
脆性	复杂缝网	滑溜水压裂液	小粒径、微粒径支撑剂

井号	渗透率/10^-3μm²	有效厚度/m	累产油量/m³	目前日产油/（m³·d^-1）	孔隙度, %	含水饱和度,%
W1	0.42	23	556	2.1	8.3	45
W2	0.48	25	875	2.4	8.3	45
W3	0.51	27	1 022	2.6	8.3	45
井号	压裂段数	每段簇数	水平段长/m	杨氏模量/GPa	泊松比	储隔层应力差/MPa
W1	7	2	700	2.5	0.21	3.5
W2	6	3	670	2.5	0.21	3.5
W3	6	2	650	2.5	0.21	3.5

井号	压裂段数	新增簇数	总液量/m³	砂比,%	施工排量/m³
W1	7	3	1 092	45	6
W2	6	2	624	50	5
W3	6	3	936	55	5

Optimization of horizontal well refracturing technology in tight reservoirs

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