Research On Transformation Technology Of The Volcanic Clastic Reservoir In The LuJiaPu Depression On The Periphery Of Liaohe Oilfield

The Lu JiaPu depression is the major oil and gas exploration area in the periphery of Liaohe Oilfield,By the end of 2014 the Proven reserves are 6658×10~4t,the total resources are 2.5×10~8t.Since exploration and development in 1987,good exploration effect of low permeability sandstone for structural reservoir in Bao 1 and Bao 14 block,Accumulative exploitation of oilis 301.96×10~4t,but the complex reservoirs of volcanic clastic rocks have not yet reached a qualitative breakthrough.Because the reservoir is shallow and have poor petrophysical properties,the natural capacity is very low,which needsfracture stimulation to further production.Limited by stimulaiton technology right now,thevolcanic clastic reservoir fracturing methods need further study.Therefore,continuous improvement of the existing technological level and the effective exploitation of deep and difficult reservoir,become an important subject in Liaohe oilfield production.The main contents of this paper:1.preliminary formation of volcanic clastic reservoir evaluation technology Analysis of fracturing factors which have been unsuccessful or poor in effect in the past so as to improve the evaluation of the corresponding reservoir quality.Analysis of the mineral composition and physical properties of 14 kinds of lithology in 5 major categories,and the optimization of the process is made.2.research on fracture temporary plugging technology for fractured tuffaceous sandstone Propose temporary plugging of natural cracks by multi layer temporary plugging functional group with“powder pottery and temporary plugging agent”,ensure that the main crack hydraulicfracturing and increase the net pressure for complexity of cracks.3.Research on the key technologies of quickgel breaking for low temperature fracturing fluid and frontline solution Because the key technologies such as quick gel breaking of low temperature fracturing fluid and frontline solution are developed.The damage to the reservoir and the demand for field scale fracturing are reduced.This technology has been applied to 9 wells in Miao 31 and Bao 38 block.The efficiency of stimulation was increased from 20%to 66%,increase 2~3 times of average single well reservoir after transformation.One of the highest daily oil 21 t of single well The effect of field application is very remarkable.Add 16800 tons of oil to 16 million 200 thousand yuan.Frontline solution technology saves 800 thousand yuan of fracturing cost.Additional 1million 410 thousand tons of proven reserves for Miao 31 block,laying a solid foundation for exploration and deployment of peripheral blocks,it has produced good economic and social benefits.