威荣深层页岩气田开发水平井测试选段技术研究

doi:10.13809/j.cnki.cn32-1825/te.2021.01.012

摘要/Abstract

摘要：

国内外成功开发的经验表明,压裂改造是实现页岩气开发的重要步骤,而测试选段是压裂改造前期工作中最为关键的一步,选段好坏决定着压裂改造的效果。以威荣页岩气田平台井为研究对象,根据前期评价井和后期开发井基础资料的特征,结合测试选段原则,对后期开发井的选段思路进行深化,并从轨迹、地质、工程、裂缝预测四大方面对开发井资料进行合理利用,形成以轨迹穿行评价、地质参数评价、工程参数评价、裂缝预测、综合分段“五步法”的页岩气水平井地质—工程一体化测试选段技术。使用该项技术开发井的测试无阻流量较前期评价井提高1~2倍,节约40 %方案时间。现场试验表明,该技术对提高深层页岩气的效益开发具有一定的借鉴。

关键词: 威荣页岩气田, 测试选段, 水平井, 效益开发, 非常规

Abstract:

The successful development experience at home and abroad shows that fracturing is an important step to realize shale gas development, and testing selection is the most critical step in the preliminary work of fracturing. The quality of the selection determines the effect of fracturing. Taking Weirong Shale Gas Field platform wells as the research object, according to the characteristics of the basic data of the early evaluation wells and the later development wells, and combined with the principle of testing selection, the later development well selection ideas are deepened. And the development well data is rationally utilized from four aspects, which are the trajectory, geology, engineering and fracture prediction, forming a geological-engineering integration technology of shale gas horizontal well testing selection in “five steps” of trajectory evaluation, geological parameter evaluation, engineering parameter evaluation, fracture prediction, and comprehensive segmentation. The test open flow rate of development wells obtained by this technology is increased by about 1~2 times compared with the previous evaluation wells, saving 40 % of the project time. Field tests show that this technology has certain guiding significance for improving the beneficial development of deep shale gas.

Key words: Weirong Shale Gas Field, test section selection, horizontal well, benefit development, unconventional

中图分类号:

TE37

王浩宇,熊亮,史洪亮,董晓霞,魏力民,简万洪. 威荣深层页岩气田开发水平井测试选段技术研究[J]. 油气藏评价与开发, 2021, 11(1): 86-94.

Wang Haoyu,Xiong Liang,Shi Hongliang,Dong Xiaoxia,Wei Limin,Jian Wanhong. Testing and selection techniques of horizontal wells in Weirong Shale Gas Field[J]. Reservoir Evaluation and Development, 2021, 11(1): 86-94.

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项目	前期评价井	后期开发井
录井	钻时、密度、全烃、C₁、特殊录井（元素、地化、矿物录井、岩心扫描）	钻时、密度、全烃、C₁、特殊录井（元素）
测井（三开）	随钻测井（自然伽马—带方位伽马、密度）标准测井（伽马能谱、补偿声波、补偿中子、高分辨率阵列感应、双井径、井斜、方位）工程测井（自然伽马、声幅、变密度、磁定位）特殊测井（偶极声波、岩性扫描、FMI）	随钻测井（自然伽马—带方位伽马）标准测井（自然伽马、阵列感应、双井径）工程测井（套管伽马、声幅变密度、磁定位）特殊测井（偶极声波）
岩心、岩屑	岩心描述、实验分析数据	岩屑次生矿物
地震	地震剖面、曲率剖面、脆性剖面、DHSR剖面	使用蚂蚁体追踪技术
其他	异常工况、水平段钻遇小层数据	异常工况、水平段钻遇小层数据

井深（m）	垂深（m）	距五峰顶距离（m）	距五峰底距离（m）	备注
3 745	3 616.08	15.7	20.1	3²顶
3 813	3 625.00	5.0	9.4	2顶
3 900	3 623.19	3.7	8.1	2中
4 300	3 609.70	3.7	8.1	2中
4 600	3 602.10	2.9	7.3	2下
4 800	3 594.92	3.7	8.1	2中
5 200	3 580.17	4.8	9.2	2上

项目	识别	分级	图充填颜色
实钻断裂、裂缝	岩屑次生矿物、气测显示、声波跳跃、地层连续性等	Ⅰ级	红色
蚂蚁体	表征裂缝发育区	Ⅱ级	橙色

分段	顶深（m）	底深（m）	层厚（m）	轨迹位置	裂缝预测	综合评价	备注
1	3 953	4 073	120	3²-2		Ⅱ类	高应力段
2	4 073	4 175	102	2	4 130~4 132 m（实钻1级）	Ⅰ类	实钻裂缝段
3	4 175	4 205	30	2	4 175~4 205 m（蚂蚁体预测2级）	Ⅰ类	预测裂缝区
4	4 205	4 295	90	2		Ⅰ类
5	4 295	4 371	76	2		Ⅰ类
6	4 371	4 490	119	2		Ⅰ类
7	4 490	4 530	40	2	4 490~4 530 m（蚂蚁体预测2级）	Ⅰ类	预测裂缝区
8	4 530	4 890	360	2		Ⅰ类
9	4 890	4 951	61	1		Ⅱ类	钻遇五峰组、套变段
10	4 951	4 990	39	2	4 975~4 990 m（蚂蚁体预测2级）	Ⅰ类	预测裂缝区
11	4 990	5 229	239	2		Ⅰ类
12	5 229	5 545	316	2		Ⅰ类

项目	耗时（d）		较前期提升（%）
项目	前期评价井	后期开发井	较前期提升（%）
资料收集	5	3.5	30.0
数据处理	8	5.0	37.5
分段思路	3	1.5	50.0
材料编写	4	2.0	50.0
合计	20	12.0	40.0