本文選題：超深井 + 固井　； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：本文屬于中石油川慶鉆探井下作業(yè)公司“井下工具管柱力學(xué)分析及應(yīng)用軟件研究”項(xiàng)目的部分研究?jī)?nèi)容。 隨著超深井越來(lái)越多,且超深井具有的管柱長(zhǎng)、懸重大、壓力高、流動(dòng)段長(zhǎng)的特點(diǎn)。使得套管在淺層井中一些不存在的安全性問題和失效問題不斷增加,影響超深井固井安全、經(jīng)濟(jì)施工。目前主要采取全井段固井和尾管固井兩種方式。通過測(cè)量?jī)x器或直接實(shí)驗(yàn)的方法來(lái)直接判斷超深井固井管柱安全性問題很困難,目前最有效的途徑是通過不同工況下固井管柱受力特點(diǎn),建立準(zhǔn)確的力學(xué)模型和數(shù)學(xué)模型,應(yīng)用軟件模擬計(jì)算成為最有效的方法和手段。本文通過對(duì)國(guó)內(nèi)外大量的文獻(xiàn)調(diào)研、收集和閱讀,分析了該領(lǐng)域國(guó)內(nèi)外的研究現(xiàn)狀,同時(shí)討論了目前超深井固井管柱力學(xué)安全性評(píng)價(jià)存在的問題,提出了本文主要研究?jī)?nèi)容和研究思路流程。其主要成果和研究?jī)?nèi)容如下： (1)完井管柱長(zhǎng)、“U”型管效應(yīng)明顯、流速不穩(wěn)定等特點(diǎn)對(duì)超深井固井管柱受力影響明顯。綜合考慮管柱重力、各種摩擦力、內(nèi)外流體壓力、井眼軌跡、“U”型管效應(yīng)等因素,建立了直井全井段和尾管段三維管柱力學(xué)微分方程。 (2)建立了“U”型管效應(yīng)下流體流速計(jì)算模型,并根據(jù)沖擊動(dòng)力原理,得出了超深井固井中流速變化是引起管柱振動(dòng)的主要原因,建立了流速改變下管柱沖擊動(dòng)載荷力學(xué)—數(shù)學(xué)模型,為管柱安全評(píng)價(jià)提供了更接近實(shí)際工況的動(dòng)載荷計(jì)算公式。 (3)建立了固井過程中不同泵壓、排量,不同固井液密度等固井參數(shù)下,管柱動(dòng)態(tài)摩阻效應(yīng)受力計(jì)算模型,提出了固井參數(shù)對(duì)管柱安全性的評(píng)價(jià)方法。 (4)根據(jù)建立的固井管柱各種工況的力學(xué)—數(shù)學(xué)模型、固井過程中的流體動(dòng)力學(xué)數(shù)學(xué)模型,編寫了固井管柱力學(xué)分析軟件,該軟件包含了各種管柱的力學(xué)強(qiáng)度數(shù)據(jù)庫(kù)、固井工具庫(kù),為固井管柱力學(xué)強(qiáng)度計(jì)算、安全性評(píng)價(jià)提供簡(jiǎn)便、可靠的方法和手段。
[Abstract]:This paper is a part of the project of "Mechanics Analysis and Application Software Research of downhole tool string" of CNPC Chuanqing drilling Company. With more and more ultra-deep wells, and ultra-deep wells have the characteristics of long string, heavy hanging, high pressure and long flow section. The safety and failure problems of casing in shallow wells are increasing, which affects the cementing safety and economic operation of ultra-deep wells. At present, it mainly adopts two kinds of methods: the whole well section cementing and the tail pipe cementing. It is difficult to determine directly the safety of cementing string in ultra-deep wells by measuring instruments or direct experiments. At present, the most effective way is to establish an accurate mechanical model and mathematical model through the mechanical characteristics of cementing string under different working conditions. The application software simulation calculation becomes the most effective method and the method. Based on a large number of literatures collected and read at home and abroad, this paper analyzes the present research situation in this field, and discusses the problems existing in the evaluation of the mechanical safety of ultra-deep well cementing string at present. The main research content and research thought flow are put forward in this paper. The main achievements and research contents are as follows: (1) the characteristics of completion string length, "U" pipe effect and unstable velocity have obvious influence on cementing string force in ultra-deep wells. Factors such as string gravity, various friction forces, internal and external fluid pressure, wellbore trajectory, "U" tube effect, etc. In this paper, the differential equations of three-dimensional pipe string mechanics are established. (2) the calculation model of fluid velocity under the effect of "U" tube is established, and according to the principle of impact force, It is concluded that the variation of velocity in ultra-deep well cementing is the main cause of string vibration, and the mechanical-mathematical model of string impact dynamic load under the change of velocity is established. The calculation formula of dynamic load is provided for string safety evaluation. (3) the calculation model of dynamic friction effect of tubing string under different cementing parameters, such as pump pressure, displacement and cementing fluid density, is established. The evaluation method of cementing parameters to string safety is put forward. (4) according to the established mechanical-mathematical model of cementing string and the fluid dynamics mathematical model in cementing process, the mechanics analysis software of cementing string is compiled. The software includes the mechanical strength database and cementing tool database of various string. It provides a simple and reliable method and means for calculating the mechanical strength and evaluating the safety of cementing string.
【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)】：TE256

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