BS区块大斜度井分段压裂工艺研究与应用
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摘要
大港油田BS85区块储层具有物性差、泥岩含量高、自然产能低等特点,需要通过压裂改造才能获得工业油流。BS19-67井是该区块的一口大斜度井,最大井斜67.69°,为最大限度改造储层,采用套管固井+滑套分段压裂工艺技术分5段进行压裂。由于该区块无准确的地应力方位测试数据,有可能在裂缝方位与井筒方位形成较小夹角,增加了施工难度。因此采用支撑剂段塞工艺、大排量施工等技术保证施工成功率,并在压裂施工过程中采用井下微地震技术对裂缝进行监测,为下步设计优化提供依据。
Dagang Oilfield block BS85 reservoir has such characteristics as poor physical property,high mudstone content and low natural productivity,it is necessary to conduct fracturing transformation so as to obtain commercial oil flow. Well BS19-67 is a high angle well in this block,with the maximum inclination of 67.69°,which is a reservoir with the maximum transformation. This reservoir is developed by using casing cementing plus sliding sleeve staged fracturing technique for fractureing in 5 sections. Because no accurate in-situ stress orientation testing data of this area are available,it will be possible to form small angle between fracture azimuth and wellbore azimuth,which will increase thedifficulty of construction. Therefore,applied are such construction techniques as proppant slug process and discharge capacity enlargement to assure the success rate. At the same time,downhole microseismic technology is applied to monitor fractures occurring probably in fracturing construction,which can provide the basis for optimization design in the future.
Dagang Oilfield block BS85 reservoir has such characteristics as poor physical property,high mudstone content and low natural productivity,it is necessary to conduct fracturing transformation so as to obtain commercial oil flow. Well BS19-67 is a high angle well in this block,with the maximum inclination of 67.69°,which is a reservoir with the maximum transformation. This reservoir is developed by using casing cementing plus sliding sleeve staged fracturing technique for fractureing in 5 sections. Because no accurate in-situ stress orientation testing data of this area are available,it will be possible to form small angle between fracture azimuth and wellbore azimuth,which will increase thedifficulty of construction. Therefore,applied are such construction techniques as proppant slug process and discharge capacity enlargement to assure the success rate. At the same time,downhole microseismic technology is applied to monitor fractures occurring probably in fracturing construction,which can provide the basis for optimization design in the future.
引文
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[2]陈晓源,任茂.坪北特低渗透油田整体压裂工艺技术研究[J].钻采工艺,2006,29(5):43-45.Chen Xiaoyuan,Ren Mao.Study on the Integral Fracturing Technique in Ultralow Permeability Reservoir in Pingbei Oilfield[J].Drilling&Production Technology,2006,29(5):43-45.
[3]王记俊,郭平,王德龙,等.基于PEBI网格的水平井裂缝参数优化[J].天然气与石油,2013,31(1):57-59.Wang Jijun,Guo Ping,Wang Delong,et al.Optimization of Fracturing Parameters of Horizontal Well in Low Permeability Reservoir Based on PEBI Grid[J].Natural Gas and Oil,2013,31(1):57-59.
[4]戴平生,李建波,杨东.大庆探区低孔低渗油气层压裂改造增产工艺技术[J].中国石油勘探,2003,8(1):67-82.Dai Pingsheng,Li Jianbo,Yang Dong.Fracturing Process Technology of Low-porosity and Low-permeability Oil and Gas Layers in Daqing Exploration Area[J].Chinese Petroleum Exploration,2003,8(1):67-82.
[5]欧阳传湘,涂志勇,付蓉,等.灰色综合评判法优选压裂井[J].岩性油气藏,2009,21(3):101-104.Ouyang Chuanxiang,Tu Zhiyong,Fu Rong,et al.Grey Comprehensive Evaluation Method in the Optimization of Fracturing well Fractured Wells[J].Lithologic Reservoirs,2009,21(3):101-104.
[6]付大其,程运甫,郝桂宪,等.大港南部难采油田整体压裂技术研究与应用[J].天然气与石油,2013,31(1):66-68.Fu Daqi,Cheng Yunfu,Hao Guixian,et al.Study on Overall Fracturing Technology in Southern Dagang Oil field Difficult to Exploit and its Application[J].Natural gas and oil,2013,31(1):66-68.
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