Southwest Petroleum University

Yili Kang

Lijun You

Chengyuan Xu

Jingyi Zhang

Chuan Liu

Chong Lin

Xiaopeng Yan

Hao Kai Zhang

Yingrui Bai

Xiaoqing Qiu

Bin Yang

Ling Lin

Chao Jiang

Wei Jiang

Mingjun Chen

Zhehan Lai

Xingyu Tang

Maoling Yan

Jiajia Bai

Xinglin Yang

Dengyu Luo

Hexiang Zhou

Shunliang Zou

Wangkun Cao

Haoran Jing

Disclosed is a method for determining a reasonable soaking time of a shale oil/gas well, implementing testing and experimentation using a device for testing a reasonable soaking time of a shale oil/gas well. The method includes: selecting a core sample; measuring and obtaining a porosity of the core sample; simulating a state of a first core sample in a reservoir; injecting methane to reach a pore pressure of the reservoir; injecting a simulated fracturing fluid into a core gripper; measuring a resistivity change curve of the first core sample; measuring and obtaining a half-life period of pressure attenuation of a first pressure sensor until an inflection point appears in the resistivity change curve of the first core sample; obtaining an experimental duration during which the first core sample and a second core sample present the shortest half-life period of pressure attenuation; obtaining a time point at which core NMR signals of the first core sample and the second core sample have the largest change amplitude; obtaining soaking time at a core scale after sorting; and obtaining the soaking time of the shale oil/gas well.

Method for determining reasonable soaking time of shale oil/gas well

The invention relates to a dynamic fracture width calculation method for drilling fluid loss in a fractured formation, which belongs to the field of loss control of drilling and well completion engineering, and includes the following steps: selecting a model according to seismic data and fracture development characteristics and calculating a static hydraulic width of a formation fracture; substituting the static hydraulic width of the formation fracture into a deformation formula of a fracture hydraulic width, to obtain a dynamic hydraulic width of a wellbore fracture; converting the dynamic hydraulic width of the wellbore fracture into an average mechanical width of the wellbore fracture, according to a conversion relational formula of a mechanical width; and solving a mechanical width distribution range of the fracture according to a standard deviation of a mechanical width distribution of a natural fracture.

Dynamic fracture width calculation method for drilling fluid loss in fractured formation

A quantitative scoring and optimization method of a drilling and completion loss-control material includes: extracting key performance parameters of drilling and completion loss-control materials in loss-circulation zone, sequencing the key performance parameters according to their importance; performing weight calculation on the key performance parameters of the loss-control material by an analytic hierarchy process; determining scores of the key performance parameters of conventional loss-control materials according to an experimental evaluation table of the performance parameters of the loss-control materials; calculating comprehensive scores of all loss-control materials and performing optimal selection on the loss-control materials according to the comprehensive scores. The present disclosure provides a quantitative evaluation table of performance parameters of the loss-control materials, and an optimal selection method of the loss-control materials for different loss-control formations according to the analytic hierarchy process.

Quantitative scoring and optimization method of drilling and completion loss-control material

The invention relates to a selection method of loss control materials for lost circulation control in fractured reservoirs based on photoelastic experiments. By using the photoelastic material to simulate rigid lost circulation material, obtaining photoelastic images and load curves during a loading process of plugging zones formed by the lost circulation material, selecting the lost circulation material according to structure stability of plugging zones. Based on 'a relationship between structures and performances' and granular matter mechanics, the present method is with high reliable to duly observe distribution and evolution of internal forces in a pressure-bearing process of plugging zones, reveal an instability mechanism of the plugging zone, and optimize the lost circulation material in a targeted manner; the present disclosure based on mesoscopic structure characterization of plugging zones is for a new idea for material selection of deep fractured reservoirs, of good repeatability, simple operation and low economic cost.

Selection method of loss control materials for lost circulation control in fractured reservoirs based on photoelastic experiments

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Chengdu, China

Yili Kang