出砂、压实段射孔套管力学性能研究
发布时间：2018-10-08 09:22
【摘要】：储层出砂在射孔炮眼附近形成空洞,空洞的形成改变了射孔段套管的载荷,加剧了射孔段套管的应力集中以及射孔段套管所受外挤载荷的非均匀性。随着空洞持续扩大和储层压实作用,射孔段套管将承受轴向压力作用,并出现轴向失稳弯曲,加大了射孔段套管毁坏的风险。为此,本文主要考虑储层少量出砂、大量出砂及套管外部形成空洞的不同形态,分析了射孔段套管的载荷和强度安全性。首先,简要分析储层出砂压实机理、储层出砂压实引起套管损坏机理和出砂压实段射孔套管的空洞形态。随后,通过分析储层出砂压实对套管轴向力的影响,考虑不同出砂程度在套管外围形成空洞的大小、形状,分别建立套管出砂形成空洞的三维有限元力学分析模型,考虑轴向压力、内压和外压对套管的联合作用,考虑不同出砂程度有限元模型的加载面积与形式,得出不同空洞大小、不同出砂程度和出砂分布对射孔段套管强度安全性的影响;得出不同生产压差及改造压力与射孔参数和射孔套管等效应力间的关系,并确定出砂压实段射孔套管的临界压差。为了直接求得套管的抗挤强度,将未射孔套管作为轴对称的圆柱壳体,将射孔套管孔边应力求解作为无限大圆柱壳体的孔口问题,运用板壳理论分析了弯矩和压差作用下未射孔套管抗挤强度计算公式和射孔套管孔边应力分布公式,并用有限元分析进行了验证,得到压差作用下套管孔边应力理论解和有限元解很吻合,误差仅在1.12%以内。分析表明本文给出的未射孔套管抗挤强度分析计算公式和射孔套管孔边应力分布计算公式可以辅助工程研究。
[Abstract]:The formation of voids in reservoir sand production near perforating holes changes the casing load of perforation section and intensifies the stress concentration of perforated casing and the inhomogeneity of external squeezing load on perforated casing. With the continuous expansion of the cavity and the compaction of the reservoir, the casing of perforated section will bear axial pressure and appear axial buckling, which increases the risk of casing destruction in perforating section. Therefore, this paper mainly considers the different forms of reservoir sand production, a large amount of sand production and the formation of cavity outside the casing, and analyzes the load and strength safety of perforated casing. Firstly, the mechanism of sand production compaction in reservoir, the mechanism of casing damage caused by sand production compaction and the cavity form of perforated casing in sand producing compaction section are briefly analyzed. Then, by analyzing the influence of sand production compaction on casing axial force, considering the size and shape of the cavity formed outside the casing with different sand production degree, the three-dimensional finite element mechanical analysis model of casing sand producing cavity is established respectively. Considering the combined action of axial pressure, internal pressure and external pressure on casing, considering the loading area and form of finite element model with different sand production degree, different cavity sizes are obtained. The influence of different sand production degree and sand distribution on casing strength safety of perforating section is obtained, the relationship between different production pressure difference and revamping pressure and perforating parameters and equivalent stress of perforating casing is obtained, and the critical pressure difference of perforating casing in sand compaction section is determined. In order to obtain the anti-extrusion strength of the casing directly, the unperforated casing is regarded as the axisymmetric cylindrical shell, and the perforating casing hole edge stress is solved as the orifice problem of the infinite cylindrical shell. Based on the theory of plate and shell, the formulas for calculating the anti-squeezing strength of unperforated casing under the action of bending moment and pressure difference and the stress distribution formula for perforating casing edge are analyzed and verified by finite element analysis. The theoretical solution of casing hole edge stress under pressure difference is in good agreement with the finite element solution, and the error is within 1.12%. The analysis shows that the calculation formula of anti-extrusion strength of unperforated casing and the stress distribution formula of perforated casing edge can be used to assist engineering research.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2
本文编号：2256248
[Abstract]:The formation of voids in reservoir sand production near perforating holes changes the casing load of perforation section and intensifies the stress concentration of perforated casing and the inhomogeneity of external squeezing load on perforated casing. With the continuous expansion of the cavity and the compaction of the reservoir, the casing of perforated section will bear axial pressure and appear axial buckling, which increases the risk of casing destruction in perforating section. Therefore, this paper mainly considers the different forms of reservoir sand production, a large amount of sand production and the formation of cavity outside the casing, and analyzes the load and strength safety of perforated casing. Firstly, the mechanism of sand production compaction in reservoir, the mechanism of casing damage caused by sand production compaction and the cavity form of perforated casing in sand producing compaction section are briefly analyzed. Then, by analyzing the influence of sand production compaction on casing axial force, considering the size and shape of the cavity formed outside the casing with different sand production degree, the three-dimensional finite element mechanical analysis model of casing sand producing cavity is established respectively. Considering the combined action of axial pressure, internal pressure and external pressure on casing, considering the loading area and form of finite element model with different sand production degree, different cavity sizes are obtained. The influence of different sand production degree and sand distribution on casing strength safety of perforating section is obtained, the relationship between different production pressure difference and revamping pressure and perforating parameters and equivalent stress of perforating casing is obtained, and the critical pressure difference of perforating casing in sand compaction section is determined. In order to obtain the anti-extrusion strength of the casing directly, the unperforated casing is regarded as the axisymmetric cylindrical shell, and the perforating casing hole edge stress is solved as the orifice problem of the infinite cylindrical shell. Based on the theory of plate and shell, the formulas for calculating the anti-squeezing strength of unperforated casing under the action of bending moment and pressure difference and the stress distribution formula for perforating casing edge are analyzed and verified by finite element analysis. The theoretical solution of casing hole edge stress under pressure difference is in good agreement with the finite element solution, and the error is within 1.12%. The analysis shows that the calculation formula of anti-extrusion strength of unperforated casing and the stress distribution formula of perforated casing edge can be used to assist engineering research.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2
【参考文献】
相关期刊论文 前10条
1 孟凡增;李宏岩;霍付春;王朝晖;;射孔对套管损坏分析研究[J];测井技术;2008年05期
2 沈琛,邓金根,王金凤;胜利油田弱胶结稠油藏岩石破坏准则及出砂预测[J];断块油气田;2001年02期
3 宋天舒,吴林志,杜善义,刘殿魁;圆柱壳非圆大开孔的应力集中研究[J];工程力学;2000年06期
4 赵洪山;管志川;;出砂井套管损坏机理及预防措施研究[J];石油天然气学报(江汉石油学院学报);2005年S5期
5 刘铁牛,邢宪军,徐道临,张锡成;射孔开裂套管的剩余强度研究[J];石油机械;1991年08期
6 窦益华;许爱荣;张福祥;张绍礼;;高温高压深井试油完井问题综述[J];石油机械;2008年09期
7 唐汝众;王同涛;闫相祯;杨秀娟;;射孔参数对套管强度影响的有限元分析[J];石油机械;2010年01期
8 窦益华,樊正祥,郑跃辉,王峰;用遗传积分法计算蠕变地层中套管的围压[J];石油钻采工艺;1996年04期
9 林元华,雷正义,施太和,曾德智,陈勇,李润方;储层压实引起套管失效的机理研究[J];石油钻采工艺;2004年03期
10 林付利;陈勉;张广清;金衍;;油藏压实、出砂引起的射孔段套损机理分析[J];石油钻采工艺;2007年02期
，本文编号：2256248
本文链接：https://www.wllwen.com/kejilunwen/shiyounenyuanlunwen/2256248.html
