發(fā)布時間：2018-06-02 18:06

  本文選題：連續(xù)油管 + 水力噴射　； 參考：《中國石油大學(xué)(華東)》2015年碩士論文

【摘要】：連續(xù)油管水力噴射壓裂技術(shù)是一種新型的水力壓裂技術(shù),集合了連續(xù)管技術(shù)、水力噴射壓裂技術(shù)的特點,具有作業(yè)周期短,起下鉆次數(shù)少,無需機械封隔和射孔工具,可實現(xiàn)壓裂和水力噴射射孔聯(lián)作,一趟管柱可以進行多段壓裂的優(yōu)點。連續(xù)油管水力噴射壓裂技術(shù)將在頁巖氣開發(fā)方面有著廣泛的應(yīng)用前景。然而連續(xù)油管剛度小,較難承受縱向壓縮載荷,容易失穩(wěn)而產(chǎn)生正弦或螺旋屈曲。另外,在壓裂加砂過程中砂粒也對連續(xù)油管產(chǎn)生了嚴(yán)重的沖蝕。因此,掌握連續(xù)油管在定向井或水平井中的受力特性和連續(xù)油管沖蝕規(guī)律非常重要,這關(guān)系到連續(xù)油管技術(shù)在我國應(yīng)用領(lǐng)域的擴大和推廣。針對這一問題本文主要做了以下工作。(1)連續(xù)油管水力噴射壓裂管柱力學(xué)模型建立。首先采用三次樣條曲線模型擬合井眼軌跡,將離散的測井?dāng)?shù)據(jù)擬合成一條光滑的空間曲線。然后在考慮了摩擦力、液壓力、支持力、重力等載荷的情況下分別應(yīng)用靜力平衡法和能量法建立了連續(xù)油管的變形微分方程。(2)連續(xù)油管水力噴射壓裂管柱微分方程的求解。首先對連續(xù)油管水力噴射壓裂管柱微分方程進行了合理的化簡。之后求解出了連續(xù)油管在正弦屈曲和螺旋屈曲的臨界解。求解出了在不同空間狀態(tài)下連續(xù)油管所受的正壓力、剪切力和彎矩力。(3)壓裂管柱應(yīng)力、伸長(縮短)及可下入性分析。應(yīng)用第四強度理論分析了連續(xù)油管的應(yīng)力。充分考慮了軸向載荷的拉伸或壓縮、熱伸長、因液壓力而伸長、由于螺旋彎曲而縮短的情況下,分析了連續(xù)油管總的伸長量。分析了壓裂工具所能通過的最大井眼曲率。(4)在理論分析和建立的數(shù)學(xué)模型的基礎(chǔ)上,利用VB計算機語言開發(fā)出連續(xù)油管水力噴射壓裂管柱受力分析軟件。(5)連續(xù)油管的沖蝕分析。基于軟件FLUENT,利用DPM模型對連續(xù)油管水力壓裂作業(yè)過程中連續(xù)油管的沖蝕進行數(shù)值模擬研究,重點研究壓裂加砂作業(yè)時絞車處纏繞連續(xù)油管及造斜段及鵝頸架處的沖蝕機理。
[Abstract]:Continuous tubing hydraulic injection fracturing is a new type of hydraulic fracturing technology, which integrates the continuous pipe technology. The hydraulic injection fracturing technology has the characteristics of short operation period, less drilling times and no need for mechanical sealing and perforating tools. The combination of fracturing and hydraulic injection perforation can be realized, and the advantages of multiple fracturing can be carried out by one string. Continuous tubing hydraulic injection fracturing technology will be widely used in shale gas development. However, the continuous tubing is difficult to withstand longitudinal compression load because of its small stiffness, and it is easy to destabilize and cause sinusoidal or spiral buckling. In addition, sand grains also cause serious erosion of continuous tubing during fracturing and sand adding. Therefore, it is very important to master the mechanical characteristics of coiled tubing in directional well or horizontal well and the erosion law of coiled tubing, which is related to the expansion and popularization of coiled tubing technology in the field of application in our country. In order to solve this problem, the main work of this paper is as follows: 1) the mechanical model of hydraulic injection fracturing pipe string of continuous tubing is established. First, the cubic spline curve model is used to fit the borehole trajectory, and the discrete logging data are fitted into a smooth spatial curve. Then, the differential equations of hydrodynamic fracturing string of continuous tubing are established by using static equilibrium method and energy method, respectively, considering friction, hydraulic pressure, supporting force and gravity, etc. At first, the differential equation of hydraulic injection fracturing pipe string of continuous tubing is simplified reasonably. Then the critical solutions of sinusoidal buckling and spiral buckling of continuous tubing are obtained. The stress, elongation (shortening) and down-entry analysis of continuous tubing subjected to normal pressure, shear force and bending moment force under different space conditions are obtained. The stress of continuous tubing is analyzed by the fourth strength theory. The total elongation of continuous tubing is analyzed when the axial load is stretched or compressed thermal elongation is elongated due to liquid pressure and the total elongation of continuous tubing is analyzed because of spiral bending. On the basis of theoretical analysis and mathematical model established, the force analysis software of continuous tubing hydraulic jet fracturing string, I. e., No. 5), is developed by using VB computer language. Based on software fluent, the erosion mechanism of continuous tubing in hydraulic fracturing process of continuous tubing was studied by using DPM model, and the erosion mechanism of winding coiled tubing and inclined section and goose neck frame in hydraulic fracturing and sand adding operation was studied.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE934.2

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