致密储层水平井重复压裂技术优化

摘要/Abstract

摘要：

为改善致密低渗储层水平井重复压裂效果,提高压后生产经济效益,针对水平井重复压裂过程中选井选层方案、压裂工艺技术开展优化研究：应用多层次模糊综合评判法和人工神经网络法,计算研究各地质因素和工程因素对重复压裂改造效果的影响规律,确定压裂选井选层标准;研究压裂及生产过程中应力场变化及裂缝转向、延伸规律,优选压裂材料;以现场数据为依据,应用真三维压裂模拟软件优化三口目标井重复压裂施工参数。研究成果可为水平井重复压裂技术的科学、高效应用提供指导。

关键词: 致密储层, 重复压裂, 水平井

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

中图分类号:

TE357

宋丽阳,王纪伟,李凤霞,刘长印,苏建政,张汝生. 致密储层水平井重复压裂技术优化[J]. 油气藏评价与开发, 2018, 8(4): 63-67.

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.

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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