Petrochina Company Limited

China Academy of Railway Sciences Corporation Limited

China Academy of Railway Sciences Corporaton Limited Railway Engineering Research Institute

Beijing Tieke Shougang Track Technology Co., Ltd

Zhanguo Ma

Zhe Li

Wei Gao

Xianwen Li

Lei Shen

Yong Ding

Jia Fan

Weibin Liu

Xianggang Du

Yajuan Wang

Xiaorui Liu

Xu Ma

Yun Ling

Liangshan Xu

Ruilin You

Qianyun Zhao

Xinxing Ma

Zhenyu Tan

Yanming Zhang

Huaqiang Shi

Man Bi

Hua Shi

Baochun Chen

Mingfang He

Yonghong Gu

Hongying Li

Xiaoyong Wen

Ruifen Hao

Guohui Su

Yangming Hu

Xuan'ang Lai

Shaowei Zhou

Yuanxiang Xiao

Shusheng Li

Qiaorong Han

Changjing Zhou

Liang Ye

Yangsheng Ye

The present invention discloses a method for lowering an oil pipe in a gas well without well-killing, a soluble bridge plug and a material preparation method thereof, wherein, the method comprises the steps of: lowering a bridge plug in a wellbore such that the bridge plug blocks the wellbore at a predetermined location in the wellbore; injecting water in the wellbore after the pressure in the wellbore has been relieved so as to replace gases in the wellbore; and lowering an oil pipe in the wellbore to the location of the bridge plug. The method for lowering an oil pipe in a gas well without well-killing, the soluble bridge plug and the material preparation method thereof provided in the present invention successfully solve the problem of high cost for lowering an oil pipe under pressure after a fracturing fluid has been injected into the casing.

Method for lowering oil pipe in gas well without well-killing, soluble bridge plug and material preparation method thereof

A fiber-reinforced prestressed reinforced concrete sleeper is integrally cast and includes a sleeper body and two rail bearing regions. A rail clamping base is arranged on a surface of the each rail bearing region. The two rail bearing regions are located under rails on both sides of the sleeper and the two rail bearing regions are located above the sleeper body. A reinforcing fiber is mixed into the two rail bearing regions only, and a reinforcing rib is arranged in the sleeper body. The reinforcing fiber is concentrated in a main stress region under the surface of the rail bearing regions. The reinforcing fiber arranged in a region with a large stress is more than the reinforcing fiber arranged in a region with a small stress.

Fiber-reinforced prestressed reinforced concrete sleeper

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Beijing, China

Zhanguo Ma