本文關(guān)鍵詞：克深區(qū)塊裂縫性儲(chǔ)層承壓封堵技術(shù)研究　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 克深區(qū)塊 裂縫性儲(chǔ)層 漏失機(jī)理 承壓封堵 試驗(yàn)研究

【摘要】：克深區(qū)塊裂縫性儲(chǔ)層裂縫發(fā)育,地層承壓能力不高,鉆井液密度窗口很窄。在鉆井過(guò)程中容易發(fā)生漏失、溢流等井下復(fù)雜。本文主要研究如何提高工區(qū)裂縫性儲(chǔ)層地層承壓能力。 通過(guò)克深區(qū)塊地質(zhì)背景及地層巖性分布,以成像測(cè)井技術(shù)為基礎(chǔ),明確白堊系巴什基奇克組致密砂巖為典型的天然性裂縫性儲(chǔ)層,裂縫大多為大傾角半填充裂縫；從克深區(qū)塊已完鉆井裂縫統(tǒng)計(jì)發(fā)現(xiàn),工區(qū)內(nèi)天然性裂縫寬度在2mmm以內(nèi)；在井筒壓力增大的情況下,裂縫寬度和形態(tài)會(huì)有所變化；通過(guò)地層傾角測(cè)井?dāng)?shù)據(jù)分析得到克深區(qū)塊的最大主應(yīng)力的方向大約為南北向,最小主應(yīng)力為東西向；根據(jù)克深區(qū)塊內(nèi)已完鉆井儲(chǔ)層漏失概況,發(fā)現(xiàn)儲(chǔ)層壓力窗口很窄,對(duì)鉆井液密度很敏感,漏失較頻繁；通過(guò)兩種承壓封堵方法對(duì)比,該工區(qū)裂縫性儲(chǔ)層更適合套管內(nèi)全裸眼段封堵。 漏失原因分為天然性漏失和人為性漏失；而根據(jù)漏失量大小可將漏失分為微漏、小漏、中漏、大漏、嚴(yán)重漏失等；根據(jù)漏失特征可將漏失分為天然性漏失、壓裂性漏失、擴(kuò)展性漏失；而不同漏失的機(jī)理和成像測(cè)井圖像都有明顯的差異,可以較好的區(qū)分。 不同研究人員提出了很多應(yīng)力關(guān)系與裂縫漏速的模型；發(fā)現(xiàn)裂縫寬度與漏速之間關(guān)系緊密,地層承壓堵漏過(guò)程中,以0.15mmm和0.4mmm為界,防漏主要是針對(duì)0.15mmm以上裂縫寬度,而堵漏需研究0.4mmm以上寬度的裂縫。最后以單一理想裂縫為對(duì)象,得到裂縫寬度與漏失量的關(guān)系。 提出各種封堵材料在承壓封堵過(guò)程中的封堵機(jī)制。分析了采用封堵材料復(fù)合封堵,使地層承壓封堵能力大大提高。通過(guò)裂縫表面單顆粒架橋、裂縫表面雙顆粒架橋、裂縫內(nèi)雙顆粒架橋三種情況的力學(xué)分析,得出封堵顆粒選擇范圍。 通過(guò)室內(nèi)承壓封堵試驗(yàn),統(tǒng)計(jì)剛性封堵材料(核桃殼)、彈性封堵材料(SQD-98)、纖維封堵材料(鋸末)的各種復(fù)合配方在1～5mm裂縫中的漏失量大小,最終得到6%核桃殼(30%中+70%細(xì))+5%SQD-98+3%以上鋸末對(duì)于1～5mm裂縫綜合承壓封堵效果最好。 最后分析克深2-2-5井裂縫性儲(chǔ)層承壓封堵技術(shù)應(yīng)用實(shí)例,結(jié)果使儲(chǔ)層的承壓封堵能力達(dá)到4.75MPa。
[Abstract]:The fractured reservoirs in Keshan block have developed fractures, low bearing capacity of formation, narrow density window of drilling fluid, and are prone to leakage during drilling. Overflow is complicated in downhole. This paper mainly studies how to improve the bearing capacity of fractured reservoir in working area. Based on the geological background and lithologic distribution of Kesheng block, the tight sandstone of the Cretaceous Bashiqike formation is defined as a typical natural fractured reservoir on the basis of imaging logging technology. The fractures are mostly large dip angle and half filled fractures; From the statistics of borehole fractures in Kesheng block, it is found that the width of natural fractures in the working area is less than 2mmm; With the increase of wellbore pressure, the width and shape of fracture will change. The direction of the maximum principal stress of Kesheng block is about north-south direction and the minimum principal stress is east-west direction through the analysis of formation dip logging data. According to the general situation of reservoir leakage in Kesheng block, it is found that the reservoir pressure window is very narrow, sensitive to drilling fluid density and frequent leakage. Through comparison of two pressure plugging methods, the fractured reservoir in this area is more suitable for plugging open hole in casing. The causes of leakage are natural leakage and artificial leakage. According to the amount of leakage, the leakage can be divided into micro leakage, small leakage, medium leakage, large leakage, serious leakage and so on. According to the leakage characteristics, the leakage can be divided into natural leakage, fracturing leakage and extended leakage. However, different leakage mechanisms and imaging logging images are obviously different, which can be well distinguished. Many models of stress relation and crack leakage velocity have been proposed by different researchers. It is found that the relationship between fracture width and leakage velocity is close. In the process of formation pressure plugging, the boundary is 0.15 mm and 0.4 mm, and the leakage prevention is mainly aimed at the width of fracture above 0.15 mm. Finally, the relationship between the width of cracks and the amount of leakage is obtained by taking a single ideal crack as an object. The plugging mechanism of various plugging materials in the process of pressure plugging is put forward. The combined plugging with plugging material is analyzed, which greatly improves the plugging ability of strata. The selection range of sealing particles is obtained by mechanical analysis of three kinds of cases: double particle bridge on crack surface and double grain bridge in crack. The rigid sealing materials (walnut shell, elastic plugging material SQD-98) were calculated by indoor pressure plugging test. The leakage of fiber plugging material (sawdust) in 1 ~ 5 mm crack. Finally, 6% walnut shell 30% of 70% fine) 5 SQD-98 3% sawdust has the best effect on the combined pressure sealing of 1mm and 5mm cracks. Finally, the application example of fractured reservoir pressure plugging technology in Kesheng 2-2-5 well is analyzed. The result shows that the pressure plugging ability of the reservoir can reach 4.75 MPA.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE28

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