Identification Method Of Low Efficiency Circulation Well In Eastern Part Of Apricot Ten Area

As a necessary means of oilfield development,water injection compensation has been widely used.After long-term water flooding,the pore structure of reservoirs will change.As a result,the permeability of long-term scouring sites will increase and the diversion ability will expand,forming an inefficient cycle.The emergence of inefficient circulation exacerbates the contradiction between the layers and the plane,so that the injection of water inefficient injection,seriously affecting the efficient development of the oil field,so the identification of inefficient recycling is essential for the development of the oil field.This paper first summarizes the current methods of inefficient circulation identification,analyzes the advantages and disadvantages of various methods,and at the same time determines the technical idea of this study,that is,first of all clear the development characteristics and influencing factors Through the combination of the method of HI and numerical simulation,we can identify inefficient circulating oil well and horizon,and construct inefficient cycle identification software by C # language,finally realize the automatic identification of inefficient cycle injection and production.First of all,the dynamic characteristics of effective oil-water well production by profile control and water plugging are statistically analyzed.For example,the low-efficiency circulating oil well has daily oil production and daily water production both lower than or higher than the average over the same period,and its flow pressure and water content are both high In the region average,water-oil ratio and derivative curve are upturned,with a strong planar and longitudinal heterogeneity and the amount of injected water and other characteristics;inefficient circulating water wells with apparent water absorption index and injection intensity is higher than the whole area The average value,the separation of the Hall curve and the derivative and so on.The inefficient circulation layer has the characteristics of low permeability circulation layer permeability,large formation coefficient and good connectivity.Secondly,the influence of geological factors and development factors on inefficient circulation is analyzed statistically.The geological factors include permeability,heterogeneity and sedimentation.Development factors include water injection intensity and cumulative water injection,water absorption index and injection well spacing.Through the screening of dynamic and static parameters,using HI method,numerical simulation method to establish low-efficiency cycle identification method,so as to identify inefficient circulating oil well.Well identification indicators include water production,oil production,injected water,water and pressure;well indicators include water absorption index and injection intensity.Once again,the inefficient cyclic beds are divided into the following three categories:(1)only one low-efficiency circulating well is connected with the inefficient circulating well and has only one layer;(2)only one low-efficiency circulating well is connected with the low-efficiency circulating well and the layers are not unique;(3)multi-port low-efficiency circulating wells connected with low-efficiency circulating oil wells,the horizon is not unique,for the case(3),using the relevance of the inefficient Pisman cycle rankings to determine the need to prioritize the direction of oil and gas wells.Validation of inefficient cycle identification results using tracer modeling techniques in ECLIPSE software for identification results.Based on the establishment of the identification method,C # language was used to compile the inefficient cycle automatic identification software,which has the advantages of simple operation and quick calculation.Finally,the actual application of 10 wells,the results show that the accuracy rate reached 90%,in line with engineering requirements.