【摘要】：下川東地區(qū)水平井、大斜度井等特殊工藝井的逐漸增多,提速提效的要求日漸增大,目前的鉆井液體系難以適應鉆井工程對泥巖、頁巖、煤層的防塌,大斜度及高壓差井段的防卡,深井段防卡以及鉆井液性能穩(wěn)定等方面的技術要求,因此,有必要對下川東鉆井液體系進一步深化研究以適應新形勢的要求。本文通過對井壁失穩(wěn)機理和易塌地層的分布狀況及特點進行研究,根據(jù)不同巖性提出相應的技術對策,重點開發(fā)有機鹽、聚合醇防塌鉆井液體系,對主要處理劑的性質(zhì)進行重點剖析,并對輔助處理劑進行了優(yōu)選,以滾動回收率、線性膨脹值、抗污染實驗等評價手段優(yōu)選出適合下川東地區(qū)侏羅系以及頁巖、煤層防塌鉆井液體系。從三疊系鉆井技術難點出發(fā),利用同離子效應以及活度平衡理論,優(yōu)化了該段聚磺鉆井液體系。從潤滑劑的抗溫、抗鹽、起泡性能等指標為突破口,利用聚合醇的潤滑作用、提高鉆井液封堵性能、改善濾餅質(zhì)量、優(yōu)化防卡解卡工藝等降低滲透地層的壓力傳遞的思路,形成二疊系特殊防卡技術。通過不加入坂土,在清水中直接加入KC1、甲酸鹽等抑制劑的基礎上,加入降失水劑、封堵劑等功能性處理,達到滿足抗溫、攜砂等要求,形成了適合石炭系水平段鉆井要求的無土相鉆井液體系。開發(fā)出的五套鉆井液體系在下川東構(gòu)造進行了試用,達到了提高鉆井速度,減少復雜事故,提高綜合經(jīng)濟效益等目的。進而形成各區(qū)塊的模塊化技術方案進行推廣應用。
[Abstract]:With the increasing number of horizontal wells, large deviated wells and other special processing wells in the eastern part of Sichuan, the requirements of increasing speed and efficiency are increasing. The current drilling fluid system is difficult to adapt to the sloughing of mudstone, shale, and coal seams in drilling engineering. In order to meet the requirements of the new situation, it is necessary to further study the drilling fluid system of East Sichuan in order to meet the technical requirements in the aspects of blocking prevention of large deviation and high pressure difference well section, deep well block prevention and stability of drilling fluid performance, so it is necessary to further deepen the study of drilling fluid system in Lower Sichuan East China in order to meet the requirements of new situation. In this paper, the mechanism of wellbore instability and the distribution and characteristics of sloughing formation are studied. According to the different lithology, the corresponding technical countermeasures are put forward, and the organic salts and polyalcohol sloughing prevention drilling fluid system are developed emphatically. The properties of the main treatment agents are analyzed emphatically, and the auxiliary treatment agents are selected to be suitable for the Jurassic and shale systems in the eastern part of Sichuan province by means of rolling recovery rate, linear expansion value, anti-pollution experiment and so on. Coal seam anti-sloughing drilling fluid system. Based on the technical difficulties of Triassic drilling, the polysulfonated drilling fluid system was optimized by using the theory of iso-ion effect and activity equilibrium. From the point of view of temperature resistance, salt resistance and foaming performance of lubricant as a breakthrough point, using the lubricating effect of polyalcohol to improve the plugging performance of drilling fluid, improve the quality of filter cake, optimize the process of card prevention, etc., the train of thought for reducing pressure transfer in permeable formation can be obtained. The formation of Permian special anti-blocking technology. By adding water reducing agent, plugging agent and other functional treatment, directly adding KC1, formate and other inhibitors in clear water without adding sakesite, to meet the requirements of temperature resistance, sand carrying, etc. A soilless drilling fluid system suitable for the horizontal section of Carboniferous drilling was formed. The five sets of drilling fluid system developed have been tried out in the structure of East Sichuan, which can improve the drilling speed, reduce the complex accidents and increase the comprehensive economic benefits. Then the modularization technology scheme of each block is popularized and applied.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE254

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