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DYNAMIC PRODUCTION PREDICTION AND PARAMETER IDENTIFICATION FOR gas well WITH VERTICAL FRACTURE

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Applied Mathematics and Mechanics(English Edition) 2002年第6期23卷 627-633页

作者：郭大立刘慈群赵金洲 Department of Computer Science Southwest Petroleum Institute Nanchong 637001 P R China Institute of Porous Flow and Fluid Mechanics Chinese Academy of Sciences Langfang 065007 P R China Department of Post Graduate Southwest Petroleum Institute Nanchong 637001 P R China

In order to devoid the hard work and factitious error in selecting charts while analyzing and interpreting hydraulic fracturing fracture parameters, on the basis of the non-Darcy flow factor, this paper put out the non-Darcy flow mathematical model of real gas in the formation and fracture, established the production history automatic matching model to identify fracture parameters, and offered the numerical solutions of those models, which took the variation of fracture conductivity in production process. These results offered a precise and reliable method to understand formation, analyze and evaluate the fracturing treatment quality of gas well.

关键词： gas well fracturing non-Darcy flow in porous media fracture conductivity parameter identification automatic matching

Decline curve based models for predicting natural gas well performance

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Petroleum 2017年第2期3卷 242-248页

作者： Arash Kamari Amir HMohammadi Moonyong Lee Alireza Bahadori Disciples of Chemical Engineering School of EngineeringUniversity of KwaZulu-NatalHoward College CampusKing George V AvenueDurban 4041South Africa Institut de Recherche en Genie Chimique et Petrolier(IRGCP) Paris CedexFrance Departement de Genie des Mines de la Metallurgie et des MateriauxFaculte des Sciences et de GenieUniversite LavalQuebecQC G1V 0A6Canada School of Chemical Engineering Yeungnam UniversityGyeungsanRepublic of Korea School of Environment Science&EngineeringSouthern Cross UniversityLismoreNSW 2480Australia Australian Oil and gas Services Pty Ltd LismoreNSW 2480Australia

The productivity of a gas well declines over its production life as cannot cover economic policies.To overcome such problems,the production performance of gas wells should be predicted by applying reliable methods to analyse the decline trend.Therefore,reliable models are developed in this study on the basis of powerful artificial intelligence techniques viz.the artificial neural network(ANN)modelling strategy,least square support vector machine(LSSVM)approach,adaptive neurofuzzy inference system(ANFIS),and decision tree(DT)method for the prediction of cumulative gas production as well as initial decline rate multiplied by time as a function of the Arps'decline curve exponent and ratio of initial gas flow rate over total gas flow rate.It was concluded that the results obtained based on the models developed in current study are in satisfactory agreement with the actual gas well production data.Furthermore,the results of comparative study performed demonstrates that the LSSVM strategy is superior to the other models investigated for the prediction of both cumulative gas production,and initial decline rate multiplied by time.

关键词： Decline curve Production Rate Model gas well

The Study of Tubing Vibration Mechanism in High Pressure gas well

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World Journal of Engineering and Technology 2021年第1期9卷 128-137页

作者： Jingbing Luo Kui Zhang Junlin Liu Lingyu Mu Fujun Wang Research Institute on Drilling & Production of PetroChina Qinghai Oilfield Company Jiuquan China CNPC Engineering & Technology Research Institute Co. Ltd. Beijing China

Deep gas wells and gas fields have the characteristics of high pressure. The vibration of the tubing string during the production of gas wells causes the string to be subjected to severe stress and even dynamic fatigue failure. Therefore, this article is based on the dynamic finite element theory, aiming at the characteristics of large-size tubing strings in deep gas wells. The finite element mechanics model and mathematical model of the tubing string vibration of the packer of high-pressure gas wells were established, and the ANSYS software was re-developed. The finite element analysis program for the vibration dynamics of the unbuckled and buckled strings of gas wells was compiled with APDL, and the displacement of the longitudinal vibration of the tubing string of high-pressure gas wells was studied. According to different sizes of tubing strings currently used in deep gas wells and gas fields, simulation calculations are carried out, and the axial impact load and buckling damage laws of the tubing strings of the entire well section under different production rates are obtained. It provides a theoretical basis for the prediction of tubing string vibration law and measures to prevent tubing string vibration.

关键词： Deep gas well High Pressure gas well Tubing Vibration Damage Buckling Finite Element

Risk Analysis of gas Hydrate Formation during Deepwater gas well Testing

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International Journal of Geosciences 2016年第9期7卷 1057-1063页

作者： Hongjun Yang Liang Hao Muwang Wu Zhanjiang Branch of CNOOC Ltd. Zhanjiang China

During deep-water gas wells testing period, predicting the generating zone of hydrate precisely in the whole flow range (bore holes and surface flow lines) is the key prerequisite of guarantee for testing flow. The unusual deep-water environment and low gas density make it easy to meet the conditions of hydrate generation during deep-water gas wells testing period, such as low temperature and high pressure, especially under the testing conditions, for instance, near mud line, surface chock line, low gas generating rate and surface shut-in. Wherefore, in view of all the operational modes during testing period (clean-out, variable rate flow, downhole and surface shut-in), based on temperature field of the whole flow range and phase equilibrium condition of hydrate, predicting method of hydrate generation zone is published;by taking enthalpy as the object of study, temperature calculation model increases the accuracy of temperature prediction;by integration of bore holes and surface lines, predicting plate of hydrate generation in the whole flow range is published. During flow period, the generating condition of hydrate is affected by rate of flow, and the lower the rate of flow is, the wider the hydrate generation zone is;during the stage of shut-in and initial flow, if pressure of strings is higher and temperature is lower, risk of hydrate generation will be greater and hydrate generation zone will be larger, so relevant actions should be taken to restrain hydrate generation.

关键词： Risk Analysis Deepwater gas well DST gas Hydrate

Effects of longwall-induced stress and deformation on the stability and mechanical integrity of shale gas wells drilled through a longwall abutment pillar

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International Journal of Mining Science and Technology 2017年第1期27卷 115-120页

作者： Daniel W.H.Su National Institute for Occupational Safety and Health Bruceton 15236PAUSA

This paper presents the results of a comprehensive study conducted by CONSOL Energy, Marcellus Shale Coalition, and Pennsylvania Coal Association to evaluate the effects of longwall-induced subsurface deformations on the mechanical integrity of shale gas wells drilled over a longwall abutment pillar.The primary objective is to demonstrate that a properly constructed gas well in a standard longwall abutment pillar can maintain mechanical integrity during and after mining operations. A study site was selected over a southwestern Pennsylvania coal mine, which extracts 457-m-wide longwall faces under about 183 m of cover. Four test wells and four monitoring wells were drilled and installed over a 38-m by84-m centers abutment pillar. In addition to the test wells and monitoring wells, surface subsidence measurements and underground coal pillar pressure measurements were conducted as the 457-m-wide longwall panels on the south and north sides of the abutment pillar were mined by. To evaluate the resulting coal protection casing profile and lateral displacement, three separate 60-arm caliper surveys were conducted. This research represents a very important step and initiative to utilize the knowledge and science obtained from mining research to improve miner and public safety as well as the safety and health of the oil and gas industries.

关键词： gas well Casing Abutment pillar Stability Safety and health Instrumentation Numerical simulation

Calculation analysis of sustained casing pressure in gas wells

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Petroleum Science 2012年第1期9卷 66-74页

作者： Zhu Hongjun Lin Yuanhua Zeng Dezhi Zhang Deping Wang Feng State Key Laboratory of Oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan 610500China Jilin Field Company PetroChinaSongyuanJilin 138000China

Sustained casing pressure （SCP） in gas wells brings a serious threat to worker safety and environmental protection. According to geological conditions, wellbore structure and cement data of gas wells in the Sichuan-Chongqing region, China, the position, time, environmental condition and the value of SCP have been analyzed. On this basis, the shape of the pressure bleed-down plot and pressure buildup plot were diagnosed and the mechanism of SCP has been clarified. Based on generalized annular Darcy percolation theory and gas-liquid two-phase fluid dynamics theory, a coupled mathematical model of gas migration in a cemented annulus with a mud column above the cement has been developed. The volume of gas migrated in the annulus and the value of SCP changing with time in a gas well in Sichuan have been calculated by this model. Calculation results coincided well with the actual field data, which provide some reference for the following security evaluation and solution measures of SCP.

关键词： Sustained casing pressure gas migration coupled mathematic model gas well

Productivity Testing Design Method of Multi-Factor Control for Unconsolidated Sandstone gas Reservoir

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Engineering（科研） 2016年第11期8卷 815-822页

作者： Muwang Wu Hao Liang Mingjie Zhang Dianqiang Sun Peng Zhong CNOOC China Ltd. Zhanjiang Branch Zhanjiang China

Reservoir safety, testing-string safety, and flow control are key factors that should be considered in deep-water unconsolidated sandstone gas well testing work system. Combined with the feature of testing reservoir, pipe string type and sea area, the required minimum testing flow rate during cleaning up process, as well as minimum test flow rate without hydrate generation, pipe string erosion critical production, the maximum testing flow rate without destroying sand formation and the minimum output of meeting the demand of development was analyzed;based on the above critical test flow rates, testing working system is designed. Field application showed that the designed work system effectively provided good guidance for field test operations;no sand production or hydrate generation happened during the test process;the test parameter evaluated the reservoir accurately;the safe and efficient test operation was achieved.

关键词： Multi-Factor Control Productivity Testing Unconsolidated Sandstone gas well Hydrate Sanding