Hydraulic fracturing expert system for low-permeability and undeveloped oil-bearing reservoirs;

The paper describes four characteristics of low-permeability reserves: low daily oil output,low recovery rate,high investment and low economic benefit.

The exploitation of difficult-to-produce reserves was an important subject.

The exploitation of difficult-to-produce reserves is an important subject.

Through analyzing the fracturing difficulties of the difficult-to-produce reserves, the main reasons of reserves difficult-to-production were determined, that is serious water lock,high threshold pressure gradient,strong stress sensitivity,complex percolation form and easy damaged in fracturing process.

Integrated study of four-property relationship of low permeability reservoir:case study of Jirgalangtu depression,Erlian basin.;

Study and application on induced flow technology in low permeability reservoir;

Flow units of low permeability reservoir of 4-7 sand sets in upper Es_2 in south of Pucheng Oilfield;

Characteristics of diagenetic reservoir facies of low-permeability reservoir in Sulige Gas Field;

Origin type of tectonic fractures and geological conditions in low-permeability reservoirs;

Origin of low-permeability reservoir and distribution of favorable reservoir;

After a period of out flow for low permeable reservoir, formation energy decreases that makes lots of annulus water pouring into formation inversely during the time of upsetting packer and hoisting up string when the operation of swabbing outflow being finished which causes the second pollution to reservoir influencing accuracy and liability of tested geology data.

Under the impressed DC electric field, the electronic double layer thickness affects absolute permeability of the low permeable reservoir greatly and absolute permeability of high permeable reservoir diminutively.

The low permeable resrevoir of Bonan Oil Field is a typical low permeable reservoir in Shengli Oil Field.