Optimization of Pipe Network Simulation Algorithm for Tree-shaped Water Injection System in Large-scale Oilfield

2021 ◽  
Author(s):  
Yan Ruan ◽  
Xuliang Zhang ◽  
Jiaona Chen
Keyword(s):  
Mathematical Model ◽  
Pressure Drop ◽  
Large Scale ◽  
Network Simulation ◽  
Water Injection ◽  
Injection System ◽  
Simulation Algorithm ◽  
Pipe Network ◽  
Reference Node ◽  
Pipe Section

As intelligence technology develops, there is a higher requirement for computing speed and accuracy of water injection system simulation. In this paper, aiming at the tree-shaped water injection pipe network system of large-scale oilfields, based on the energy equation for calculating the pressure drop [Formula: see text] of pipe section, a mathematical model of the pipeline unit and the node unit is established, and finally, a mathematical model of pipe network for the entire water injection system is established; then, the improved iterative algorithm is used to solve the simulation model of water injection system. In this way, we determine the boundary calculation conditions, take the water injection station as reference node, and use the maximum pressure of water injection well as the initial value of the reference node for calculation, which reduces the number of iterations in model calculation; by comparing the simulation results of different iteration steps, 0.01 is selected as the iteration step size due to its higher calculation accuracy; and the calculation process has also been optimized. The process of solving the characteristic matrix [Formula: see text] is combined with the process of calculating the pressure drop [Formula: see text] of pipe section, and placed outside the algorithm loop, thereby shortening the calculation time of a single cycle and reducing the calculation amount of the algorithm. The application cases show that the proposed optimization algorithm for water injection system pipe network simulation can be used as an effective method to improve the solution speed and calculation accuracy of the simulation algorithm of tree-shaped water injection system in large-scale oilfields.

scholarly journals The research on the operation mode and parameter selection method of large-scale water injection pipeline network

2021 ◽  
Author(s):  
Yan Ruan ◽  
Huan Liu ◽  
Jiaona Chen
Keyword(s):  
Large Scale ◽  
Effective Means ◽  
Operation Mode ◽  
Water Injection ◽  
Selection Method ◽  
Optimal Operation ◽  
Injection System ◽  
Operating Parameters ◽  
Pipe Network ◽  
Pipeline Network

AbstractDue to the complexity of the large-scale water injection pipe network system and the difficulty of manual analysis, it is impossible to guarantee the optimal operation mode scheme selected. At present, there are still gaps in the research on the judgment of its optimal operation mode. Through the calculation and evaluation of a large amount of water injection system data, the selection method of the optimal operation mode of the water injection system is determined, and it is found that the selection of the optimal operation mode is closely related to the pressure distribution characteristics of the individual wells of the entire water injection system, and five discriminant rules for the optimal operation mode of the water injection system are formed based on these characteristics; the mathematical model for determining the mode and the optimal method of operating parameters is given, and the pipeline network simulation system automatically generates the pipe network topology diagram; the optimal operation mode of the water injection system is developed; Intelligent judgment software can modify its operating parameters according to needs, change operating modes, easily simulate the energy consumption in various modes of operation, adjust and find the optimal operation plan of the water injection pipe network. Application examples show that the judgment rules of the optimal operation mode of the water injection system and the optimization method of operating parameters can be used as an effective means for selecting the optimal operation plan for a large-scale water injection pipeline network.

scholarly journals Research and practice on optimal design method of the oilfield water injection system pipeline network

2021 ◽  
Vol 2076 (1) ◽  
pp. 012003
Author(s):  
Fengjiao Qu ◽  
Tingting Liu ◽  
Zhiming Zhang ◽  
Weiyi Xie ◽  
Yansong Wang ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Energy Loss ◽  
Partial Pressure ◽  
Optimization Design ◽  
Design Method ◽  
Water Injection ◽  
Injection System ◽  
Pipe Network ◽  
Pressure Water ◽  
Oilfield Water

Abstract The efficiency of oilfield water injection system is generally low and energy consumption is high. With the deepening of oilfield exploitation, the water cut of the oilfield is increasing, the power consumption of the water injection system is increasing year by year, the oilfield exploitation cost is increasing, and energy conservation and consumption reduction are very important. In order to improve oilfield water injection efficiency and reduce water injection energy loss, this paper puts forward the pipe network optimization design method of partial pressure water injection, establishes the mathematical model of partial pressure water injection pipe network and throttling loss calculation model, compiles the calculation software of partial pressure water injection mathematical model, optimizes the partial pressure interval, calculates the partial pressure points, effectively reduces the energy loss of water injection system and improves the efficiency of water injection system.

The Key Technology Research of the Water Injection System Energy Saving for Super Low Permeability Reservoir in Changqing Oil Field

2012 ◽  
Vol 524-527 ◽  
pp. 1217-1222 ◽  
Author(s):  
Zhi Qiang Huang ◽  
Zhen Chen ◽  
Gang Zheng ◽  
Jian Qiang Xue ◽  
Xue Yuan Li
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Large Scale ◽  
Water Injection ◽  
High Energy ◽  
Economic Benefits ◽  
Oil Field ◽  
Injection System ◽  
Low Permeability ◽  
Load Rate

With the characteristics of low permeability, pressure and abundance, it's extremely hard to exploit the super low permeability reservoirs in ChangQing oil field. For this reason, the water injection recovery technique has been widely used. Analysis showed that a serious problem of high energy consumption exist in the water injection system, the power consumption of which accounts for about 44%. And the energy cost of pump units reach up to 43%, it's the highest energy consumption link in the system. In this paper the load rate classification method (LRCM) is firstly adopted to statistical analyze water injection stations, which are divided into the owing and over load rate stations. As a result, the owing load rate stations accounts for 83.8%, with a serious phenomenon of the Big Horse Pull A Small Carriage, causing the large-scale backflow in the station, and the efficiency is low, the energy consumption is on the high side. Aimed at water injection stations with different load rate, the methods of reasonable shutting down the pumps, pump replacement, optimizing the transmission ratio and piston size, as well as the speed control technology have been used to make the outlet flow and actual demand reasonable matching. The test result shows that the energy saving technology is well targeted, simple, practical and low cost. The pump units’ efficiency improves obviously, the consumption reduces by 10%, which greatly improve the oilfield economic benefits.

scholarly journals Mathematical Model of Thermodynamic Processes in the Intake Manifold of a Diesel Engine with Fuel and Water Injection

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4315
Author(s):  
Vladimir Bondar ◽  
Sergei Aliukov ◽  
Andrey Malozemov ◽  
Arkaprava Das
Keyword(s):  
Mathematical Model ◽  
Diesel Engine ◽  
Rational Design ◽  
Water Injection ◽  
Injection System ◽  
Intake Manifold ◽  
Design Parameters ◽  
Working Fluid ◽  
The Mathematical Model ◽  
Thermodynamic Processes

The article presents the results of a study aimed at creating a mathematical model of thermodynamic processes in the intake manifold of a forced diesel engine, taking into account the features of simultaneous injection of fuel and water into the collector. In the course of the study, the tasks of developing a mathematical model were solved, it was implemented in the existing software for component simulation “Internal combustion engine research and development” (ICE RnD), created using the Modelica language, and verification was undertaken using the results of bench tests of diesel engines with injection fuel and water into the intake manifold. The mathematical model is based on a system of equations for the energy and mass balances of gases and includes detailed mathematical submodels of the processes of simultaneous evaporation of fuel and water in the intake manifold; it takes into account the effect of the evaporation of fuel and water on the parameters of the gas state in the intake manifold; it takes into account the influence of the state parameters of the working fluid in the intake manifold on the physical characteristics of fuel and water; it meets the principles of component modeling, since it does not contain parameters that are not related to the simulated component; it describes the process of simultaneous transfer of vapors and non-evaporated liquids between components; and it does not include empirical relationships requiring data on the dynamics of fuel evaporation under reference conditions. According to the results of a full-scale experiment, the adequacy of the mathematical model developed was confirmed. This model can be used to determine the rational design parameters of the fuel and water injection system, the adjusting parameters of the forced diesel engine that provide the required power, and economic indicators, taking into account the limitations on the magnitude of the mechanical and thermal loads of its parts.

A New Mathematical Model for Pipe Friction Coefficient Inversion in Oilfield Water Injection System

2013 ◽  
Vol 13 (21) ◽  
pp. 4540-4544
Author(s):  
Wang Yu-xue ◽  
Zhou Shao-hua ◽  
Wei Shu-hui ◽  
Wang Yin-feng
Keyword(s):  
Mathematical Model ◽  
Friction Coefficient ◽  
Water Injection ◽  
Injection System ◽  
Oilfield Water

scholarly journals Optimization design method for urban sewage collection pipe networks

2020 ◽  
Vol 81 (9) ◽  
pp. 1828-1839 ◽  
Author(s):  
Jiandong Tian ◽  
Guifang He
Keyword(s):  
Mathematical Model ◽  
Optimization Design ◽  
System Optimization ◽  
Optimization Method ◽  
Large System ◽  
Decision Variable ◽  
Pipe Network ◽  
Main Pipe ◽  
Pipe Section ◽  
Network Project

Abstract In this study, a secondary subsystem mathematical model is established under the condition that the layout of the sewage collection branch, trunk, and main pipe network projects is fixed. The sewage collection branch and trunk pipe network projects are treated as the research objective by taking the minimum annual cost of the sewage collection pipe network projects as the objective function, the longitudinal slope of the pipe section and the economic flow rate of the pipe section as constraints, and the diameter of the pipe section as the decision variable. A first-level subsystem mathematical model is established by taking the sewage collection branch, trunk, and main pipe network project as the research object. A large system mathematical model is established in the same manner. This model can be solved using the large system secondary decomposition–dynamic programming aggregation method, and the optimal diameter for each pipe section can be obtained. A regional sewage collection pipe network project in Taizhou city was considered as an example for comparative analysis before and after optimization, and the results verified that the optimization method proposed in this study can solve this complex large system optimization problem.

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