本文選題：氣體鉆井 + 井壁穩(wěn)定性分析�。� 參考：《東北石油大學》2017年碩士論文

【摘要】：川南昭通頁巖示范區(qū)的天然氣儲層具有硬度大、研磨性強、可鉆性差、漏層多的特征,造成該地區(qū)鉆井過程中鉆速慢、鉆井周期長、鉆井成本高,氣體鉆井技術的應用能夠極大的提高機械鉆速,解決上述問題。然而并非所有的地層條件和油藏類型適用氣體鉆井技術,地層出水、出氣以及井壁坍塌情況的出現都有可能導致嚴重的氣體鉆井事故,使氣體鉆井難以達到預期的效果。本文基于地質、鉆井、測錄井等資料,全面掌握昭通頁巖示范區(qū)塊的地質構造特征,為氣體鉆井適應性評價研究提供必要的地質依據。綜合分析地層壓力分布特征、地層巖性及地層出水、出氣特征對氣體鉆井的影響,結合工區(qū)地層特征,對該區(qū)氣體鉆井地層進行了適應性評價。開展研究區(qū)塊巖石力學參數分析,建立該地區(qū)的地應力模型和縱向連續(xù)地層孔隙壓力剖面,總結分布其分布規(guī)律的基礎上,建立氣體鉆井井壁穩(wěn)定預測模型,完成昭通頁巖示范區(qū)塊氣體鉆井井壁穩(wěn)定性分析。根據建立地層出水計算模型,根據測井數據判斷出水層位,并采用聲波時差和雙側向電阻數據結合的方法預測出水層位,引用滲流力學原理建立地層出水量計算模型。建立巖石可鉆性與巖石力學參數之間的關系模型,結合研究區(qū)塊的現場數據,建立該區(qū)塊地層的可鉆性剖面,并通過可鉆性級值的改變判斷出在該區(qū)塊采用氣體鉆井具有提速潛力。本文針對昭通頁巖示范區(qū)開展了有關氣體鉆井適用性方面的研究,在常規(guī)過程中出現的井壁掉塊問題,井漏,卡鉆等問題,在氣體鉆井中都可以通過選用空氣錘和牙輪鉆頭,控制井底壓力等方法有效避免。為川南地區(qū)這種巖性復雜,地層可鉆性差的頁巖氣井施工提供了理論支持,保證氣體鉆井更好地發(fā)揮其優(yōu)勢,最大限度的保證氣體鉆井的施工安全,提高經濟效益。
[Abstract]:The natural gas reservoir in Zhaotong Shale demonstration area in southern Sichuan is characterized by high hardness, strong abrasive, poor drillability and many leaking layers, which results in slow drilling speed, long drilling period and high drilling cost in this area.The application of gas drilling technology can greatly improve the mechanical drilling speed and solve the above problems.However, not all formation conditions and reservoir types are suitable for gas drilling technology. The emergence of formation water, gas and wellbore collapse may lead to serious gas drilling accidents, which makes gas drilling difficult to achieve the desired results.Based on the geological, drilling and logging data, this paper comprehensively grasps the geological structure characteristics of Zhaotong Shale demonstration area, and provides the necessary geological basis for the study of gas drilling adaptability evaluation.The influence of formation pressure distribution, formation lithology, formation effluent and gas outgassing on gas drilling is comprehensively analyzed. Combined with the formation characteristics of the working area, the adaptability evaluation of gas drilling formation in this area is carried out.Based on the analysis of rock mechanics parameters in the study block, the in-situ stress model and the vertical continuous formation pore pressure profile are established, and on the basis of the distribution law, the prediction model of gas drilling sidewall stability is established.The stability analysis of block gas drilling sidewall in Zhaotong Shale demonstration area is completed.According to the formation effluent calculation model and the logging data, the water layer is determined, and the method of combining acoustic time difference and dual lateral resistance data is used to predict the effluent layer, and the seepage mechanics principle is used to establish the formation water output calculation model.The relationship model between rock drillability and rock mechanics parameters is established, and the drillability profile of the formation of the block is established by combining the field data of the study block.According to the change of drillability grade, it is concluded that gas drilling has the potential of increasing speed in this block.In this paper, the applicability of gas drilling in Zhaotong Shale demonstration area has been studied. In the conventional process, the problems such as block loss of wellbore, well leakage, drilling jam and so on can be solved by selecting air hammer and cone bit in gas drilling.Control of bottom-hole pressure and other methods to effectively avoid.It provides theoretical support for the construction of shale gas wells with complex lithology and poor formation drillability, ensures that gas drilling can play its advantages better, ensures the safety of gas drilling to the maximum extent, and improves economic benefits.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE24
，

本文編號：1747604