Effective Explitation Of Poor Quality Oil Reserves Of Shen-358 Block In Liaohe Depression

The Poor Quality Oil Reserves refer to the oil resources which have proved undeveloped reserves with poor quality of resources,complex distribution characteristics and difficultlyof exploition.The development of such reservoirs usually faces with the problem of high investment and high cost.The object of research in this paper is the Es4 Reservoirs of Block 358 in Damintun Sag of Liaohe Oilfield.On the base of geological data,seismic data,well logging data and experimental analysis data,we carried out a fine description of the reservoir geological body,determine the main development Area,conduct reservoir description,evaluate the potential of Es4 reservoir,and realize the effective development of poor quality oil reserves.Through field test,obtaining the main mode of reservoir reconstruction and the key technical parameters to improve development efficiency to provide technical support for the development of poor quality oil reserves.A horizontal well combination is mainly used for horizontal wells.Based on the horizontal well volume fracturing technology,the reservoir is rebuilt as a whole to maximize the reserve utilization rate and achieve Effective use of extralow permeability and ultra-low permeability reserves.Through data analysis,summarized,get the following conclusions:Combining the regional tectonic background,this paper study the sedimentary characteristics and the distribution of the reservoir.Under the precondition of phased,the method based on oil exploration conclusions and seismic waveform characteristics is used to predict the effective reservoir.Practice has proved that this method is very effective and quickly clarifies the main development area,reduce development risk.The reservoir characteristics were evaluated by CT scan.The poor reservoir properties and low permeability of the reservoir were mainly due to the concentration of pore throats in a relatively small range and weak effective seepage.The feasibility of fracturing of reservoir volume is discussed,the sandstone and sand conglomerate vertical development is continuous,the reservoir brittleness index is high,and easy fracturing is conducive to the formation of mesh seam,which can effectively improve the seepage capacity of reservoir.This method captures the main contradiction and effectively improves the productivity of the single well,shortens the investment cycle and guarantees the efficiency of the block scheme.In the process of rapid production,with the method of build-production integration evaluation,the inefficient input is reduced and the reserves are effectively used through adjust and determine the basic evaluation parameters of reservoir and cancel the invalid reserves in time.Through numerical simulation and field test,the method of repeated fracturing of water injection and horizontal well is determined.The design and development scheme is optimized: the length of horizontal well was determined to be about 800 m,the well spacing was 200-250 m,and the direction was 43 degrees north;with 16 horizontal Wells,the reserve control degree is 91%;The reasonable working system is found out in the process of production.Under the premise of maintaining the formation pressure,the higher production time is extended to ensure better productivity and reduce the investment recovery period and achieve higher economic benefits.In this paper,the geological problems that affect poor quality oil reserves are taken as the main starting points.Through the comprehensive evaluation of reserves and the effective development of technical research,the effective development of poor quality oil reserves is studied.The development method can maximize the reserves utilization rate and realize the effective utilization of ultra-low permeability and ultra-low permeability reserves,which provides reference for the effective development of poor quality oil reserves in Liaohe Oilfield.