Study On Permeability Damage Mechanism Of Gas Sand Layer In The Eastern Area Of Daqing

During the drilling process,due to various reasons,it will inevitably cause damage to the reservoir.It can occur from a series of processes such as drilling of oil and gas layers to coring,cementing,perforating,oil testing,workover,fracturing,and acidification.Damage to the permeability of oil and gas reservoirs will not only affect the productivity and longevity of oil and gas wells,but may also result in the loss of oil and gas reservoirs during exploration.Also,once the reservoir has been damaged,restoring it to its original permeability is difficult,and some are not even possible.Therefore,as far as possible in the drilling and completion of a series of processes,oil and gas layer damage should be controlled to a minimum.Protecting oil and gas reservoirs and maximizing their recovery have increasingly attracted the attention of drilling workers.Daqing Oilfield has experienced more than 40 years of exploration and development and has entered the middle and late stage of exploration and development of oil and gas fields.Currently,it is facing a grim situation of unbalanced storage and exploitation and insufficient resources to be replaced.How to reduce damage to oil and gas layers during drilling has become a guarantee.An important factor for high recovery.The researches on the mechanism of the gas bearing formation damages due to completion fluids in the east of Daqing are made.The static damage testing method is used to test the damages due to water,clay,solids phase,etc.The mechanism and degree of damages are Well Rnown after the test.The reliable basis are provided to design the plan of completion fluids which can avoid damaging the gas bearing formation.In oil and gas field reservoirs,there are usually many sensitive minerals.During the oil and gas exploration process,the sensitivity assessment data of oil and gas fields are the basic data needed in the exploration and development of oil and gas fields.Therefore,the experimental evaluation of reservoir sensitivity has a very important role.Reservoirs are greatly affected by sensitivity.Studying the sensitivity of reservoirs can avoid unreasonable exploitation methods and reduce damage to reservoirs,which is beneficial to the efficient development of oil fields.In this paper,an evaluation method of reservoir sensitivity flow experiment was adopted,and sensitivity experiment on some rocksamples was conducted.the experimental results were analyzed and evaluated.Base on the research above we have certain understanding of this reservoir’s sensitivity,which provides a theoretical basis for rational exploitation of the oilfield and reduce the damage of this reservoir.