爬行器测井安全评估数学模型分析

Research on mathematic model calculations for downhole tractor logging safety assessment

为了保证爬行器找水系统安全可靠,对爬行器下井过程进行了力学分析,建立了地面电缆张力和爬行器缆头张力数学模型。通过案例计算验证,得到理论计算结果与工程实测数据吻合较好;同时还得到爬行器自由下放极限深度的理论计算结果与工程测试结果几乎一致,说明采用本文建立的数学模型预测地面电缆张力和爬行器缆头张力较准确,计算结果可信;通过数学模型可准确预测启动爬行器的最佳时机,有效防止电缆堵塞井眼。研究结果对于降低测井风险,提高测井成功率具有重要意义。

Horizontal well stimulation technique is an important technology to improve the efficiency of oil well development.With the exploitation of oil well,the water problem is becoming more and more serious,which greatly affects the efficiency of oil well exploitation.The crawler water technology has realized the operation of the oil well without stopping production,has been widely used in the oilfield,and has achieved good economic benefits.In order to ensure the safety and reliability of the crawler water system,the mechanical analysis of the well process of the crawler is carried out,and the mathematical model of ground cable tension and spider spring cable tension is established.Through the case calculation verification,theoretical calculation results obtained are in good agreement with the measured data.It is also obtained that the spider free lower limit depth of the theoretical calculation results and engineering test results are almost unanimous,which shows that the established mathematical model can predict the ground cable tension and the spider spring tension accurately.By mathematic model,the best time to start the spider can be accurately predicted,and can prevent the cable from plugging the hole effectively.The research results are of great significance for reducing logging risk and improving logging success rate.