Research And Application Of Pry-type Liquid Production Metering Of Cluster Well Group In Q Oilfield

The metering of oil well output is an important basis to analyse reservoir variation,to obtain the dynamic data and to develop the development plan of oil field,which is an important work in the production of crude oil.At present,the single well metering mainly relies on the CMS instrument to carry out on-site operation.There are many defects in field operation,such as the large number of wells,the difficulty of construction,and the maintenance workload of equipment.On the basis of digitization,the output of pumping well is measured on line by indicator diagram.In the process of field operation,the error of on-line metering of indicator diagram is large,the correction period is long,and the metering is not accurate enough.The research and application of liquid production Metering of cluster well group can be carried out to realize automatic multi-well rotation measurement of cluster well group,which can reduce the measurement error of oil well.Firstly,this paper carries on the scheme design from the metering system and the PLC automatic control system,in which the metering system includes the design and selection of the electrodynamic valve,the separating tank,the metering tank and the Magnetic level gauge,etc.According to the design scheme,the whole flow of metering process is formed.therefore,it is determined that the scheme of pry-type liquid production Metering of Cluster well Group,which is measured before separation is adoptedSecondly,this paper uses the Fluent to simulate the separation process.First of all,the geometric model of the separation tank is established by the Design Model,then the mesh of the flow field is completed by the Mesh module.After the analysis of the independence of the mesh is completed,the grid with the number of 27W units is finally adopted.The Eulerian model and the RNG k-?turbulence model are selected by the model,and the algorithm adopts the Phase Coupled SIMPLE.By setting the residual values of each phase to meet the condition of 1 10^-5,the calculation result is converged.Finally,the flow condition of the whole flow field in the separation tank is obtained.In order to possess a high separation effect for the designed separation tank,the Superiority and inferiority of the separation device are considered in the light of the gas separation efficiency.By comparing the diameter of overflow port,the diameter of bottom flow port,the shape of tank bottom and the height of inlet of separating tank,it is concluded that the diameter of the overflow port is 100mm,the diameter of the bottom flow port is 60 mm,the inlet height of 0 mm is used as a separation tank for the end use.The influence factor analysis of the separation efficiency from the inlet flow rate and the gas-containing ratio is analyzed,and the separation efficiency is increased with the increase of the inlet flow rate,however,the pressure drop of the bottom flow port also increases.And with the increase of the inlet gas-containing rate,the separation efficiency and the pressure drop are all down.Finally,on the basis of the research results of the first two parts,the field experiment of the designed cluster well group metering device is carried out in Q oilfield.Through the comparison with the actual daily production,it is shown that most of the wells are low production and low efficiency wells in this block.The metering error of the device in the field measurement process is obtained,the results show that the metering error of the device is low.On this basis,the error is analyzed and the rule that the error rate decreases with the increase of output is obtained.Through the experiments on the rotation of the six-port cluster well group are analyzed,the results show that the device has good adaptability to rotating metering of cluster well groups.