【摘要】：由于裂縫性儲層裂縫發(fā)育,裂縫性儲層水平井與常規(guī)儲層水平井相比,優(yōu)化水平井井眼方位需要考慮的因素更多,也更為復雜。文中以地質力學為基礎,在優(yōu)選裂縫性儲層水平井井眼方位的同時,考慮天然裂縫分布、天然裂縫的激發(fā)和井眼穩(wěn)定性,從地質、鉆井和壓裂的角度出發(fā),采用理論研究和數(shù)值模擬,形成了裂縫性儲層水平井井眼方位優(yōu)化方法。首先,根據(jù)井壁成像數(shù)據(jù)對天然裂縫分布進行統(tǒng)計分析,選擇天然裂縫發(fā)育的方位;其次,通過建立天然裂縫面的應力模型,計算在一定壓裂壓力下容易滑動的天然裂縫方位;最后,通過建立裂縫性儲層的井眼穩(wěn)定模型,計算出在確定的方位范圍內井眼相對穩(wěn)定的方位作為優(yōu)選的水平井方位。優(yōu)選的裂縫性儲層井眼穩(wěn)定方位既有利于壓裂裂縫與天然裂縫溝通,又相對容易激發(fā)天然裂縫,且井眼相對穩(wěn)定,對于提高單井產(chǎn)量、減少工程復雜有重要作用。
[Abstract]:Due to the development of fractures in fractured reservoirs, there are more factors to be considered and more complex to optimize the hole orientation of horizontal wells compared with conventional horizontal wells. Based on geomechanics, this paper considers the distribution of natural fractures, the stimulation of natural fractures and wellbore stability while selecting the orientation of horizontal wellbore in fractured reservoir, and sets out from the angle of geology, drilling and fracturing. Based on theoretical research and numerical simulation, a method of hole azimuth optimization for horizontal well in fractured reservoir is developed. Firstly, the distribution of natural fractures is statistically analyzed according to the imaging data of wellbore, and the orientation of natural fractures is selected. Secondly, by establishing the stress model of natural fracture surface, the orientation of natural fractures that slide easily under a certain fracturing pressure is calculated. Finally, through establishing the wellbore stability model of fractured reservoir, the relative stable azimuth of borehole is calculated as the optimum horizontal well azimuth in the determined azimuth range. The optimal wellbore stability orientation of fractured reservoirs is not only conducive to the communication between fracturing fractures and natural fractures, but also relatively easy to stimulate natural fractures, and the borehole is relatively stable, which plays an important role in increasing the production rate of single well and reducing the complexity of engineering.
【作者單位】： 中國石油塔里木油田分公司油氣工程研究院;中國石油集團鉆井工程技術研究院;
【基金】：國家科技重大專項“大型油氣田及煤層氣開發(fā)”課題“鉆井工程設計和工藝軟件”(2011ZX05021-006)
【分類號】：TE243

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