注触变性水泥停泵安全启动压力预测

袁彬; 杨远光; 杨生荣; 刘力铭; 陈小菊

doi:10.3969/j.issn.1001-5620.2016.06.014

注触变性水泥停泵安全启动压力预测

doi: 10.3969/j.issn.1001-5620.2016.06.014

1. 西南石油大学石油与天然气工程学院, 成都 610500;
2. 中石油煤层气有限责任公司韩城分公司, 陕西韩城 715409

基金项目:

国家科技重大专项（2011ZX05022-005HZ）

详细信息

作者简介:
袁彬,1987年生,西南石油大学在读研究生。电话15881104045;E-mail:yuanbin19880118@126.com。

中图分类号: TE256.9
计量
- 文章访问数: 548
- HTML全文浏览量: 159
- PDF下载量: 250
- 被引次数: 0
出版历程
- 收稿日期: 2016-08-20
- 刊出日期: 2016-11-30

Prediction of Safe Starting Pressure after Pump Halt for Thixotropic Cement Slurry Injection

1. School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chnegdu 610500;
2. The Hancheng Branch of PetroChina Coalbed Methane Company Limited, Hancheng, Shaanxi 715409

摘要

摘要: 触变性水泥浆是现场防窜、堵漏的有效手段之一，但是在注水泥过程中若临时停泵，再启泵时启动压力会随停泵时间增加而增大，启动压力过大可能压漏薄弱地层，甚至无法启泵。针对上述情况，在分析多种触变性模型的基础上，提出了描述触变性水泥浆特征的模型；并将该模型与压降方程结合，得出了注触变性水泥停泵安全启动预测模型。用该模型分析触变性水泥浆在不同井身结构下的启动压力，实例计算结果表明：停泵时间越长，环空间隙越小，所需要启动压力越大，停泵30或60 min后启动压力分别达到13.94和21.12 MPa，选用φ139.7 mm的套管停泵30 min的启动压力比用φ177.8 mm的套管低了4.66 MPa，停泵60 min的启动压力降低了7.51 MPa，触变剂加量改变影响附加压耗，触变剂加量由5%降为2.5%后，30 min的启动压力降低了42.73%。因此触变性水泥浆应在环空间隙较大的井使用，可降低因故停泵重启泵时的风险。
- 触变性水泥 /
- 触变模型 /
- 临时停泵 /
- 启动压力
Abstract: The use of thixotropic cement slurry is an effective means of anti-channeling and controlling lost circulation in feld operations. In pumping thixotropic cement slurry, if pump halts, the pressure of re-starting the pump will increase with time. Too big an initiation pressure may result in lost circulation to weak formations, or lead to the pumping that is unable to be re-started. To solve this problem, a model describing the characteristics of thixotropic cement slurry has been presented based on the analysis of several thixotropy models. A combination of this model and pressure drop equations gave birth to the model for predicting the safe re-starting pump pressure in injecting thixotropic cement slurry. The re-starting pressures for thixotropic cement slurry injected into wells with different well profles were calculated, indicating that the longer the halt of pump and the smaller the annular clearance, the higher the re-starting pressure required. After pump halted for 30 min and 60 min, the re-starting pressures were 13.94 MPa, and 21.12 MPa, respectively. The re-starting pressure when a φ139.7 mm casing was used was 4.66 MPa lower than when a φ177.8 mm casing was used, if the pump halted for 30 min. If the pump halted for 60 min, this re-starting pressure decrease was 7.51 MPa. The concentration of thixotropic agent also affected the additional pressure loss. When the concentration of the thixotropic agent was reduced form 5% to 2.5%, the 30 min re-starting pressure was reduced by 42.73%. From these data it is understood that thixotropic cement slurry should be used in wells with big annular clearance to minimize the risk experienced in restarting the pump.
- Thixotropic cement /
- Thixotropy model /
- Pump halt /
- Start pressure

HTML全文

参考文献(11)

[1]	丁士东, 张卫东. 国内外防气窜固井技术[J]. 石油钻探技术, 2002, 30(5):35-38. DING Shidong, ZHANG Weidong. Domestic and oversea cementing techniques of gas-channeling prevention[J]. Petroleum Drilling Techniques, 2002, 30(5):35-38.
[2]	CLEMENT C C. A scientific approach to the use of thixotropic cement[J]. JPT, 1979, 31(3):344-346.
[3]	刘崇建, 刘孝良. 触变性水泥的评价方法及其应用[J]. 天然气工业, 2001, 21(2):56-60. LIU Chongjian, LIU Xiaoliang. Thixotropic cement evaluation method and its application[J]. Natural Gas Industry, 2001, 21(2):56-60.
[4]	杨林, 张凤华, 唐川林, 等. 浆体管道输送水击压力波波速的探讨[J]. 力学与实践, 2002, 24(5):28-31. YANG Lin, ZHANG Fenghua, TANG Chuanlin, et al. On the pressure wave speeds in slurry pipelines[J]. Mechanics in Engineering, 2002, 24(5):28-31.
[5]	奚斌, 韩洪升, 刘扬, 等. 环形断面管道水击波速公式推导及其摩阻损失分析[J]. 应用数学和力学, 2013, 34(9):908-914. XI Bin, HAN Hongsheng, LIU Yang, et al. Analysis of water-hammer wave speed and friction loss in annular space[J]. Applied Mathematics and Mechanics, 2013, 34(9):908-916.
[6]	陈文芳. 非牛顿流体的一些本构方程[J]. 力学学报, 1983(1):16-26. CHEN Wenfang. Some of the constitutive equation of non-newtonian fluid[J]. Chinese Journal of Theoretical and Applied Mechanics, 1983 (1):16-26.
[7]	刚芹果. 触变性流体的一些本构模型[J]. 力学与实践, 2000, 6(22):20-23. GANG Qinguo. Some constitutive models for thixotropic fluids[J]. Mechanics in Engineering, 2000, 6(22):20-23.
[8]	BERKER A, VAN ARSADALE W E. Phenomenological models of viscosity plastic, thixotropic and granular materials[J]. Rheol Acta, 1992(31):119-138.
[9]	纪士东, 周道林. 陶瓷泥浆触变模型的研究[J]. 硅酸盐通报, 1996(5):23-27. JI Shidong, ZHOU Daolin. The research on thixotropy model of ceramic slip[J]. Portland bulletin, 1996 (5):23-27.
[10]	王东, 李群海, 李静, 等. 埋地含蜡原油管道停输再启动压力计算[J]. 油气储运, 2005, 24(10):21-25. WANG Dong, LI Qunhai, LI Jing, et al. Calculation on shut down and restart-up of buried waxy grude oil pipeline[J]. Oil & gas storage and transportation, 2005, 24(10):21-25.
[11]	李兆敏, 蔡国琰. 非牛顿流体力学[M]. 东营市:石油大学出版社, 1998. LI Zhaomin, CAI Guoyan. Non-newtonian fluid mechanics[M]. Dongying:University of petroleum press, 1998.