China University of Petroleum

Beijing University of Chemical Tehcnology

China National Petroleum Corporation

Selskapet Gudme Stad As

Cimc Offshore Engineering Research Institute Co. Ltd.

Zhanjiang Branch of Cnooc (china) Co., Ltd

Cnpc Bohai Driling Engineering Company Limited

Shandong Pengbo Safety and Environmental Protection Service Co., Ltd.

Baojiang Sun

Zhiyuan Wang

Yonghai Gao

Jianbo Zhang

Hao Li

Xiaohui Sun

Bangtang Yin

Xuerui Wang

Shikun Tong

Jintang Wang

Guomin Yan

Litao Chen

Shujie Liu

Ye Chen

Jihao Pei

Jie Zhong

Tianbao Ding

Bo Zhang

Hui Liu

Wei Zhang

Yang Yang

Bin Liu

Yang Zhao

Chengwen Wang

Ruihe Wang

Peng Liu

Ning Zhang

Xueqing Teng

Jianliang Zhou

Shen Guan

Gang Liu

Weidong Zhou

Xiantao Meng

Guodong Chen

Qiang Huang

Hongyin Wei

Menglei Ma

Heen Zhang

Fengliang Xi

Jinshan Ma

Qingwen Kong

Yuting Wang

Xueqi Liu

Shuang Xu

Nan Ma

Junjie Hu

Yingwen Ma

Xuliang Zhang

Yuhang Pang

Zheng Liu

Yanli Guo

Meipeng Ren

Longqiao Chen

Kai Feng

Zhennan Zhang

Guizhen Xin

Ning Wang

Xiaoao Liu

Jiacui Luan

Wenchao Sun

Yun Liu

Zisen Yang

Jiafang Xu

Baitao Fan

Xinxin Zhao

Haichao Xu

Yufa Su

Yanling Wang

Yaoming Zhang

Lei Liang

Mingzhao Huang

Di Li

Hongtao Liu

Jintao Qi

Chi Zhang

Wenqiang Lou

Haikang He

Youqiang Liao

Liming Wei

Zhiming Yin

Zhengfeng Shan

Linsong Song

Xuefeng Li

Xing Wang

Shaowei Pan

Long Ma

Ove Tobias Gudmestad

Dahui Liu

Lei Chen

Jing Yu

Yuanlin Zhao

Disclosed are a device and method for rapidly regulating downhole pressure after a kick in deepwater shallow open-circuit drilling. The device includes a real-time monitoring device and a real-time regulation device. Aiming at deepwater shallow open-circuit drilling characteristics, the present disclosure proposes that a drilling fluid return condition at a seabed is monitored through a subsea remote operated vehicle (ROV); based on this data, whether gas influx occurs in a downhole or not and changes of the gas influx rate and the formation pressure after the gas influx are analyzed in real time, and then real-time guidance is provided for the design of key parameters such as well killing fluid displacement and density, and the well killing fluid displacement and density are regulated in real time, to achieve rapid regulation of the downhole pressure after gas influx of deepwater shallow open-circuit drilling.

Device and method for rapidly regulating downhole pressure after kick in deepwater shallow open-circuit drilling

A microscopic and macroscopic evaluation method for a dual-effect hydrate inhibitor is provided. The method is applicable to the performance evaluation of traditional thermodynamic inhibitors and kinetic inhibitors. The present invention comprehensively evaluates the dual-effect hydrate inhibitor microscopically and macroscopically through a microscopic evaluation device and a macroscopic evaluation device, thereby more intuitively and efficiently screening out the dual-effect inhibitor with excellent performance. The present invention explains the action mechanism of the dual-effect inhibitor microscopically, accurately evaluate the effects of the inhibitor in two aspects of particle aggregation and particle adhesion, and provide a theoretical basis for screening the dual-effect inhibitor. Moreover, the present invention can verify the screened inhibitor macroscopically by using a flow evaluation device close to a field working condition to obtain the action effects of the dual-effect inhibitor under different production parameters, so that the comprehensive and multi-angle performance evaluation of the dual-effect inhibitor is achieved.

Microscopic and macroscopic evaluation method for dual-effect hydrate inhibitor

A well-killing system for ultra-deep well drilling with co-existence of overflow and lost circulation is provided. An upper part of a wellhead blowout preventer is connected to a first mud pump and a lost circulation material mud tank through a pipeline, a first three-way control valve, and a second three-way control valve. A lower port of the second three-way control valve is connected to a second mud pump and a mud pit. A lower port of the first three-way control valve is connected to a first well-killing fluid tank and a second well-killing fluid tank. A gas-liquid separation tank is connected to a side of a wellhead device. A first pressure sensor and a first flowmeter are provided on a left port of the first three-way control valve. A second pressure sensor and a second flowmeter are provided at a left port of a third three-way control valve.

Well-killing system for ultra-deep well drilling with co-existence of overflow and lost circulation and operation method thereof

A device and a method for early monitoring of gas intrusion based on pressure wave propagation are provided in the present disclosure. The technical solution is as follows. The lower end of the liquid storage tank is connected to the simulated wellbore through a liquid injection pipeline, a centrifugal pump, a pressure-stabilizing water tank, and a mass flowmeter. One end of the gas storage tank is connected to a screw air compressor, while the other end is connected to the simulated wellbore through an injection pipeline and a micro-orifice flowmeter. The gas-liquid mixer is provided at the upper end of the simulated wellbore, with the pressure-disturbing device connected below it. Multiple pressure sensors are provided at the middle of the simulated wellbore and connected to the computer via wires and an oscilloscope.

Device and method for early monitoring of gas intrusion based on pressure wave propagation

An experimental device and method for co-existence of overflow and lost circulation in a fractured formation during drilling of a deviated well are provided. An inner cavity of an outer pipe is provided with an inner pipe to form a deviated casing. An upper side of the outer pipe is provided with a mixture outlet. A middle-lower side of the outer pipe is provided with a leakage port and two overflow ports. The gap width can be changed by adjusting a bolt and a support block to be compatible with different types of fracture models. A gas injection system includes an air compressor and a gas flowmeter. An upper port of a liquid injection system is connected to a joint arranged at upper ends of the inner pipe and outer pipe through a water pump, a liquid flowmeter and a liquid regulating valve.

Experimental device and method for co-existence of overflow and lost circulation in fractured formation during drilling of deviated well

A device for simulating gas intrusion and bullheading in a wellbore under different inclinations is provided, which includes a wellbore outer pipe with an inner pipe and an LED light source therein. An outer wall of the wellbore outer pipe is provided with one or more inlets. A bubble generator is arranged outside a lower plug, and extends through the lower plug via an air inlet needle into the inner cavity of the wellbore outer pipe. An input end of the bubble generator is connected to an air compressor. A lower outlet of the wellbore outer pipe is connected to an inlet of a formation unit through a pipeline and a back pressure valve. A simulating method using such device is also provided.

Device and method for simulating gas intrusion and bullheading in wellbore under different inclinations

A preparation method for and an application of a modified siloxane-based supercritical carbon dioxide thickener are disclosed. The method includes the following steps: using 1,3-diallyl-1,3,5-triazine-2,4,6-trione as a polymerization monomer, and dropwise adding 1,3,5,7-tetramethylcyclotetrasiloxane for hydrosilylation in the presence of a catalyst to obtain a modified siloxane polymer. The obtained modified siloxane polymer is directly used as a supercritical carbon dioxide thickener without purification post-treatment; when in use, the modified siloxane polymer is prepared into a solution with a concentration of 1-2%, has an excellent thickening effect with no cosolvent required, and has high solubility in carbon dioxide and high temperature resistance.

Preparation method for and application of modified siloxane-based supercritical carbon dioxide thickener

An apparatus for preventing and controlling secondary generation of hydrates in a wellbore during depressurization exploitation of offshore natural gas hydrates includes a gas recovery pipe column, a water recovery pipe column, a gas-liquid mixed transportation pipe section, a data collecting and processing unit, and a reaction control apparatus; according to characteristics of different exploitation pipe columns, three injection pipelines and three monitoring points are arranged to predict dynamic changes in a secondary generation risk of the hydrates throughout the wellbore; measures for preventing and controlling the secondary generation of the hydrates are taken at different pipe column positions by the integrated utilization of inhibitor injection, heating for pipe columns, the additional arrangement of electric submersible pumps, and other methods.

Apparatus for preventing and controlling secondary generation of hydrates in wellbore during depressurization exploitation of offshore natural gas hydrates and prevention and control method

A pressure compensation device with an accumulator group for controlled pressure drilling includes an electrical flat valve, a check valve, an accumulator group, a flanged pup joint and a support base. The electrical flat valve is connected to the check valve and is mounted on a top surface of the support base. The accumulator group mounted on the whole support base is a pre-storage pressure compensation device for controlled pressure drilling, and is located at a downstream position of the check valve. The liquid inlet end of the accumulator group is connected to the check valve, and the liquid discharge end is connected to the flanged pup joint.

Pressure compensation device with accumulator group for controlled pressure drilling

A high-efficiency yield-increasing exploitation method for natural gas hydrates includes steps of drilling of natural gas hydrate reservoirs along horizontal wells, seepage increasing by fracturing for fracture forming and stability improvement by grouting in the natural gas hydrate reservoirs, and yield improvement by combined exploitation of depressurization of the horizontal wells and heat injection; according to the present invention, drilling time is shortened by rapid drilling along the horizontal wells, the permeability of the reservoirs can be effectively improved by fracturing for fracture forming, the stability of the reservoirs can be improved by injecting foam cement slurry into the reservoirs, and the yield of the natural gas hydrates can be improved by the combined exploitation method of depressurization of the horizontal wells and heat injection.

High-efficiency yield-increasing exploitation method for natural gas hydrates

A drilling well underground kick processing method and device are described. The method includes: collecting actual logging data zat current moment; predicting, according to a filtering estimation value {circumflex over (x)}of logging data at previous moment and the actual logging data zat the current moment, a state prediction value {circumflex over (x)}and a filtering estimation value {circumflex over (x)}of the logging data at the current moment under the normal drilling condition by using a Kalman filter; inputting a prediction error, an innovation vector and a Kalman filtering gain matrix Kat the current moment into a pre-trained BP neural network; obtaining a corrected filtering estimation value {circumflex over (x)}of the logging data at the current moment according to a filtering residual and the filtering estimation value {circumflex over (x)}of the logging data at the current moment; and determining that a kick occurs under the condition that the corrected filtering estimation value {circumflex over (x)}is not matched with the actual logging data z.

Drilling well underground kick processing method and device with self-feedback adjustment

The present invention relates to the field of natural gas production, and discloses a well structure for natural gas hydrate production, which comprises: a natural gas production well (); an injection well () capable of extending into a geothermal reservoir and injecting a heat-carrying fluid; a curved connecting well (), the inlet end of the curved connecting well () is connected to the outlet end of the injection well (); a hydrate production horizontal well (), which may be arranged in a shallow hydrate reservoir (), the curved connecting well () and the hydrate production horizontal well () are connected by an ascending well section (). With the above technical scheme, the high curvature connected well connecting the horizontal well and the vertical well can be located in the bottom layer below the hydrate reservoir, enhancing the stability and production efficiency of the gas hydrate production well.

Well structure for natural gas hydrate production

The present invention provides a method and equipment for optimizing hydraulic parameters of deepwater managed pressure drilling in real time. The method comprises: acquiring overflow parameters in the current drilling process, performing preprocessing and feature extraction on the overflow parameters, and inputting the overflow parameters into trained support vector machine identification models for overflow judgment. If overflow occurs at the current drilling depth, reducing an opening of a throttle valve and increasing a displacement of a submarine pump, measuring a wellhead back pressure and calculating a bottom hole pressure, and judging whether overflow continues is performed. If overflow continues, mixing high-density drilling fluid with the original drilling fluid, pumping the mixture into a wellbore annulus, and performing the above operations of reducing the throttle valve opening, increasing the displacement of the submarine pump, calculating the bottom hole pressure and judging whether overflow continues is performed until overflow no longer occurs.

Method and equipment for optimizing hydraulic parameters of deepwater managed pressure drilling in real time

An active control method and system for wellbore pressure in open-cycle drilling in marine natural gas hydrates. The system comprises a drilling system, a drilling fluid injection system, and a data processing system for conducting the drilling operation.

Active control method and control device for wellbore pressure in the open-cycle drilling of marine natural gas hydrates

The well killing device comprises: a first path; a flow regulating device; a pressure detector and a controlling device. The controlling device may control the discharge amount of the killing fluid in different killing stages according to the gas-fluid two-phase flow theory, the pressure of the killing fluid at the wellhead, and the rising speed of the drilling column.

Well killing method and device for a fractured formation without safety pressure window by five-step bullheading

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Shandong, China

Baojiang Sun