發(fā)布時間：2018-09-18 12:47

【摘要】：我國塔里木、江漢等油田鹽巖地層分布較為廣泛,由于鹽巖層的蠕變等特性從而引發(fā)了嚴重的鹽巖層套損問題。為此,本文以鹽巖層套管外載計算、套管抗外擠與抗內(nèi)壓實驗研究為主題,在調研國內(nèi)外相關文獻的基礎上,開展了以下研究工作：(1)推導了開爾文模型地層套管外載計算方程、3元件及以下流變地層套管外載計算通式,分析了鹽巖層套管外載影響因素及其影響規(guī)律。分析結果表明：粘彈性(鹽巖)地層套管載荷穩(wěn)定值由套管、水泥環(huán)參數(shù)、地層泊松比及長期剪切模量共同決定,而非等于上覆地層壓力；隨著水泥環(huán)彈性模量的增加,套管外載先增加再減小,套管外載的峰值取決于地層、水泥環(huán)、套管參數(shù),而不是簡單的取決于水泥環(huán)彈性模量；(2)以塔里木油田鹽巖層常用的6種非API標準套管為研究對象,采用有限元方法分析了非均勻地應力、套管偏心、井斜角及方位角對鹽巖層套管載荷的影響規(guī)律,并對比分析了鹽巖層為Heard模型時套管載荷有限元計算結果和鹽巖層為粘彈性模型時套管載荷理論計算結果,建立了兩者之間的聯(lián)系,計算與分析結果表明：非均勻地應力會大大增加鹽巖層套管損壞的風險；外徑250.83mm、壁厚15.88mm的套管在塔里木油田損壞的風險很大；造斜段井眼方位與水平最大主應力夾角為45°時可降低套損事故的發(fā)生率；(3)開展了套管非均勻外擠實驗研究,得出了外徑177.8mm、壁厚12.65mm套管在集中載荷下的變形規(guī)律；(4)設計了一套套管抗內(nèi)壓強度測試裝置,該裝置可以模擬井下工況下的溫度及套管軸向伸長受限制的情況,形成了一套套管抗內(nèi)壓強度及變形規(guī)律測量方法。并開展了套管抗內(nèi)壓實驗；
[Abstract]:The salt strata in Tarim and Jianghan oil fields are widely distributed in China. Therefore, in this paper, the calculation of casing load in salt rock formation, the experimental study of casing anti-extrusion and anti-internal pressure are the main topics, and based on the investigation of relevant literature at home and abroad, The following research works have been carried out: (1) the calculation equation of casing load in Kelvin model and the general formula for calculating casing load under rheological formation are derived, and the influencing factors and their influencing rules are analyzed. The results show that the stability of casing load in viscoelastic (salt rock) strata is determined by casing, cement ring parameters, formation Poisson's ratio and long-term shear modulus, not equal to overlying formation pressure, and with the increase of elastic modulus of cement sheath, the stability of casing load is determined by casing, cement ring parameters, formation Poisson's ratio and long-term shear modulus. The peak value of casing load depends on the formation, cement sheath, casing parameters, rather than simply depends on the elastic modulus of cement sheath. (2) six kinds of non-API standard casing used in salt rock formation of Tarim Oilfield are taken as the research object. The influence of non-uniform ground stress, casing eccentricity, well inclination angle and azimuth angle on casing load in salt rock is analyzed by finite element method. The results of finite element calculation of casing load with Heard model and the theoretical calculation result of casing load with viscoelastic model are compared and analyzed, and the relationship between them is established. The results of calculation and analysis show that the non-uniform in-situ stress will greatly increase the risk of casing damage in salt rock formation, the casing with outer diameter 250.83 mm and wall thickness 15.88mm casing will be at great risk of damage in Tarim Oilfield. The occurrence rate of casing damage can be reduced when the angle of azimuth and horizontal maximum principal stress is 45 擄. (3) the experimental study of casing non-uniform extrudation is carried out, and the deformation law of outer diameter 177.8 mm and wall thickness 12.65mm casing under concentrated load is obtained. (4) A set of testing device for casing internal pressure strength is designed. The device can simulate the limitation of temperature and casing axial elongation under downhole conditions, and form a set of measuring methods of casing internal pressure strength and deformation law. The experiments of casing internal pressure resistance are also carried out.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TE931.2

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本文編號：2247971