渤海中深层探井水力喷射压裂可行性研究
Feasibility Study on Hydraulic Jet Fracturing Technology for Exploration Wells Targeting Middle and Deep Layer in Bohai Oilfield
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- 引用格式:
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张启龙,徐刚,霍宏博,李进,陈卓.渤海中深层探井水力喷射压裂可行性研究[J].天然气与石油,2020,38(5):64-70.doi:10.3969/j.issn.1006-5539.2020.05.011
Zhang Qilong, Xu Gang, Huo Hongbo, Li Jin, Chen Zhuo.Feasibility Study on Hydraulic Jet Fracturing Technology for Exploration Wells Targeting Middle and Deep Layer in Bohai Oilfield [J].Natural Gas and Oil,2020,38(5):64-70.doi:10.3969/j.issn.1006-5539.2020.05.011
- DOI:
- 10.3969/j.issn.1006-5539.2020.05.011
- 作者:
- 张启龙1,2，徐刚1,2，霍宏博1,2，李进1,2，陈卓1,2
Zhang Qilong1,2 Xu Gang1,2 Huo Hongbo1,2 Li Jin1,2 Chen Zhuo1,2
- 作者单位:
- 1. 中海石油(中国)有限公司天津分公司, 2. 海洋石油高效开发国家重点实验室
1.Tianjin Branch of CNOOC Ltd., Tianjin, 300459, China 2.State Key Laboratory of Offshore Oil Exploitation, Tianjin, 300459, China
- 关键词:
- 渤海油田;渤中凹陷中深层;水力喷射压裂;可行性研究;探井转开发井
Bohai oil field; Deep layer of Bozhong sag; Hydraulic jet fracturing; Feasibility study; Conversion of exploration wells to development wells
- 摘要:
- BZ 19-6油气田的有效开发对满足京津冀发展的能源需求有着重要作用,但由于潜山地层情况复杂、耐磨性高,探井的单井工期成本过高,考虑使用水力喷射压裂技术增加探井产能以满足探井转开发井的产量要求。通过对水力喷射压裂过程的流体力学分析,建立了一套水力喷射压裂参数设计方法,利用该方法并结合BZ 19-6油气田的储层埋深和海上作业规模,分析了水力喷射压裂技术在BZ 19-6油气田探井上应用的可行性。随着作业深度的增加,井口泵压和环空套压都随之增加,88.9 mm和114.3 mm油管的极限水力喷射压裂深度分别为5 700 m和6 800 m,满足BZ 19-6油气田对作业深度的要求。海上平台的设备能够满足水力喷射压裂在BZ 19-6油气田作业时排量、泵压、液量等方面的要求。预计作业工期比常规压裂缩短50%,在降本增效方面优势明显。综合考虑作业深度、作业规模、设备要求、工期成本等多个方面因素,水力喷射压裂具备在BZ 19-6油气田探井上进行的条件,有望成为该油田探井转开发井的重要技术储备。
Oil and gas field BZ19-6 is the largest medium-deep oil and gas field found in Bohai Oilfield and even in China. It plays an important role in meeting the energy demand of the development of Beijing, Tianjin and Hebei.However, due to the complex conditions of buried hill formation and high wear resistance, the cost of single well construction duration was too high.Hydraulic jet fracturing technology was considered to increase the productivity of exploration wells to meet the production requirements of exploration wells into development wells.Based on the hydrodynamic analysis of hydraulic jet fracturing process, a set of parameters design method for hydraulic jet fracturing was established.Combining this method with the limitation of reservoir depth and offshore operation capacity in oilfield BZ19-6, the feasibility of applying hydraulic jet fracturing technology to exploration wells in Bohai oilfield BZ19-6was analyzed.With the increase of operation depth, wellhead pump pressure and annulus casing pressure increased.The ultimate hydraulic jet fracturing depth of 88.9 mm and 114.3 mmtubing was 5 700 m and 6 800m respectively,which met the requirements of oilfield BZ19-6 for operation depth.The equipments at offshore platform could meet the requirements of displacement, pump pressure and fluid volume of hydraulic jet fracturing of BZ19-6 operation.The predicted operating duration was 50% shorter than that of conventional fracturing, which had obvious advantages in cost reduction and efficiency enhancement.Considering the operation depth, operation scale, equipment requirements, time & cost and other factors, hydraulic jet fracturing had the feasibility to work on exploration wells in oilfield BZ19-6, and would be expected to become an important technical reserve for exploration wells to be converted to development wells in this oilfield.
