Petrochina Company Limited

Beijing University of Posts and Telecommunications

Xiaorui Liu

Zhe Li

Wei Gao

Lei Shen

Xianwen Li

Yun Wang

Yong Ding

Yajuan Wang

Xu Ma

Yun Ling

Zhanguo Ma

Jianguo Yu

Qianyun Zhao

Kaile Li

Zhihe Wu

Yuanxiang Xiao

Xinxing Ma

Yibo Huang

Man Bi

Huaqiang Shi

Hua Shi

Mingfang He

Baochun Chen

Hongying Li

Yonghong Gu

Ruifen Hao

Guohui Su

Xiaoyong Wen

Shaowei Zhou

Liang Ye

Feixiang Zhang

Changjing Zhou

Yanming Zhang

Qiaorong Han

Yangming Hu

Xuan'ang Lai

Shusheng Li

A common-emitter amplifier with unilateral pre-embedding inductors includes: an input matching circuit, a first-stage amplification circuit, a first-stage interstage matching circuit, a second-stage amplification circuit, a second-stage interstage matching circuit, a third-stage amplification circuit, and an output matching circuit. The common-emitter amplifier is configured to: make an input signal sequentially enter bases of common-emitter transistors of the first-stage, second-stage, and third-stage amplification circuits, make the input signal be amplified stage by stage by the common-emitter transistors, and finally make an amplified input signal obtained by amplifying of each common-emitter transistor output through a collector of each common-emitter transistor. The common-emitter amplifier is configured to introduce interstage staggered tuning to expand bandwidth to address a narrowband problem. The unilateral pre-embedding inductors are configured to reduce a required value of the parallel embedding inductor to reduce difficulty of implementing the parallel embedding inductor, conducive to the realization of transmission lines.

Common-emitter amplifier with unilateral pre-embedding inductors

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

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Beijing, China

Xiaorui Liu