發(fā)布時(shí)間：2018-01-19 10:11

  本文關(guān)鍵詞： 射孔套管 溫度場 熱應(yīng)力 壓裂 有限元分析　出處：《西安石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：大規(guī)模體積壓裂具有排量大、泵壓高的特點(diǎn),壓裂過程中,大量低溫流體注入,引起套管的溫度變化,從而產(chǎn)生熱應(yīng)力,對套管的強(qiáng)度安全造成很大影響。因此,本文以射孔段套管為研究對象,考慮溫度場與應(yīng)力場的耦合作用,分析射孔段套管的力學(xué)性能。對射孔段套管熱應(yīng)力的研究,首先進(jìn)行了射孔段套管溫度場分析。根據(jù)熱力學(xué)第一定律和熱傳遞基本理論,確立了合理的邊界條件,建立了射孔段套管-水泥石環(huán)-圍巖的三層導(dǎo)熱模型,通過有限元分析軟件對射孔段套管-水泥石環(huán)-圍巖進(jìn)行了溫度場分析。在溫度場分析的基礎(chǔ)上,利用ANSYS有限元協(xié)同仿真平臺進(jìn)行了射孔段套管-水泥石環(huán)-圍巖系統(tǒng)溫度場與應(yīng)力場的耦合,得出了熱應(yīng)力分布結(jié)果。最后,進(jìn)行了射孔段套管熱應(yīng)力影響因素的分析與研究,應(yīng)用控制變量法,建立不同屬性的有限元模型,分析了水泥石環(huán)幾何特性與物理特性對射孔段套管熱應(yīng)力的影響。結(jié)果表明:壓裂施工過程中,射孔段井筒的溫度分布沿徑向及環(huán)向均存在不均勻現(xiàn)象。套管熱應(yīng)力約為套管材料屈服強(qiáng)度的38.3%,水泥石環(huán)熱應(yīng)力約為水泥石環(huán)材料屈服強(qiáng)度的55%。最大熱應(yīng)力點(diǎn)均分布于孔眼水平軸線的兩側(cè),若孔眼處出現(xiàn)微裂紋,則向橫向擴(kuò)展。地層的位移變化方向指向井筒中性軸,對套管有擠壓作用。水泥石環(huán)厚度的增大對水泥石環(huán)本身的熱應(yīng)力有降低作用,卻對套管熱應(yīng)力表現(xiàn)為增大趨勢。因此,為了降低套管熱應(yīng)力,保證套管的強(qiáng)度安全性,在水泥石環(huán)強(qiáng)度安全的前提下,優(yōu)選水泥石環(huán)厚度為25~30mm。水泥石環(huán)的材料屬性中,彈性模量對熱應(yīng)力的影響最大,泊松比對熱應(yīng)力的影響最小。
[Abstract]:Large-scale volume fracturing has the characteristics of large displacement and high pump pressure. During fracturing, a large number of low-temperature fluids are injected into the casing, resulting in the change of casing temperature and thus the thermal stress. It has a great influence on the strength safety of casing. Therefore, the coupling effect of temperature field and stress field is considered in this paper. To study the thermal stress of perforated casing, the temperature field of perforated casing is analyzed firstly, according to the first law of thermodynamics and the basic theory of heat transfer. The reasonable boundary conditions are established, and the three-layer heat conduction model of perforated section casing, cement stone ring and surrounding rock is established. Through the finite element analysis software, the temperature field of casing, cement stone ring and surrounding rock in perforation section is analyzed, based on the analysis of temperature field. The coupling of temperature field and stress field of casing cement ring surrounding rock system in perforation section is carried out by using ANSYS finite element simulation platform. The results of thermal stress distribution are obtained. The influence factors of casing thermal stress in perforating section are analyzed and studied. The finite element model with different attributes is established by using the control variable method. The influence of the geometric and physical characteristics of cement stone ring on the thermal stress of perforated casing is analyzed. The results show that: during fracturing operation. The temperature distribution in perforating section is uneven along radial and circumferential direction. The thermal stress of casing is about 38.3% of the yield strength of casing material. The thermal stress of the cement ring is about 55% of the yield strength of the cement ring material. The maximum thermal stress points are distributed on both sides of the horizontal axis of the hole. The displacement direction of the formation is directed to the neutral axis of the wellbore and the casing is extruded. The increase of the thickness of the cement stone ring can reduce the thermal stress of the cement stone ring itself. Therefore, in order to reduce the casing thermal stress and ensure the safety of casing strength, under the premise of cement stone ring strength safety. The thickness of cement stone ring is 25 ~ 30mm. among the properties of cement stone ring, elastic modulus has the greatest influence on thermal stress, and Poisson's ratio has the least effect on thermal stress.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE357;TE931.2

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