Shale gas ground gathering and transportation pipe network rolling development scheme optimization solver and method

Abstract

The invention relates to a shale gas ground gathering and transportation pipe network rolling development scheme optimization solver and method. The solver comprises four units of a data management unit, a pipe network hydraulic model establishment unit, an optimization model establishment unit and an optimization solution unit, and integrates multiple functions of pipe network simulation calculation, new well access pipe network time optimization, extension pipe network connection relation optimization, pressurization station distribution, pressurization capacity optimization and the like. According to the shale gas ground gathering and transportation pipe network rolling development scheme optimization solution method, an objective function and a constraint condition construction moduleare combined, and a pipe network optimization objective function is established with the maximum gas field income; model simplification is carried out through a linear interpolation and optimization model boundary condition processing method, and conversion from a MINLP problem to LP, NLP and MILP optimization problems can be realized; a plurality of optimization solvers such as CPLEX, GUROBI, SCIP and the like are adopted to carry out optimization calculation on LP, NLP, MILP and MINLP problems in sequence, and an optimal scheme for rolling development of the shale gas gathering and transportation pipe network is formulated.

Description

technical field [0001] The invention relates to an optimization solver and method for a rolling development plan of a shale gas surface gathering and transportation pipeline network, and belongs to the technical field of optimization design of an oil and gas gathering and transportation pipeline network system. Background technique [0002] Shale gas refers to unconventional natural gas that occurs in organic-rich shale and its interlayers, mainly in the form of adsorption or free, and its main component is methane. According to the conclusions of Mancini in the United States and the actual situation in my country, shale gas development has the characteristics of rapid pressure drop in the initial stage of production, low stable production output, and long production time in the low pressure stage. Combined with the law of shale gas production in my country, shale gas production is divided into a drainage production period and a normal production period. [0003] Liquid dra...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to determine the design scale of the ground gathering and transportation system, which is the difficulty of design

For the rolling development mode adopted by shale gas fields, it is difficult to accurately evaluate the new production capacity in the later stage, which increases the difficulty of determining the design scale of surface gathering and transportation

[0010] (2) Shale gas low-pressure single well backflow phenomenon

[0013] In the later stage of the gas field, with the addition of new wells, the production of gas wells constructed in the early stage will be seriously affected. The specific manifestations are: the production of shale gas increases, and the pressure of the pipeline of the gathering and transportation system also increases. When the wellhead back pressure rises, the production of existing gas wells will drop sharply, or even stop production in severe cases, greatly reducing the gas production of shale gas wells, making it difficult to achieve the ideal production increase effect of the gathering and transportation system

[0014] (4) Problems of gas field boosting production in the later stage

[0015] At the beginning of shale gas production, the wellhead pressure was high, but the pressure decayed rapidly in a short period of time, and most of the time thereafter was in a low-pressure production state. At this time, it is necessary to consider how to make full use of the high initial pressure of new shale gas wells, and to deal with the problems of old wells. The problem of long-term low-pressure production of wells makes it difficult to determine the design pressure of the surface gathering pipeline network. At the same time, shale gas fields need to consider boosting production in the early stage of production

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