| The low permeability reservoir has half of total reserves in our country;its exploration and development plays an important role in the future. Atechnique used in low permeability oil fields named"exploding in oil layers"is brought forward after having absorbed lesson of Well Shooting, havingsummarized the successful experience of High Energy Gas Fracturing andhaving utilized Hydraulic Fracturing. It will improve recovery ratio, increaseproduction of oil and natural gas and economic benefit of fields."Explodingin oil layers"is a new technology for increasing production in low-permeatedoil fields.This thesis is concerning a technique about increasing production in lowpermeability oil fields. The rock damage and fracture by shock wave in"exploding in oil layers"can be simulated by the experiment of exploding onthe surface of the cement sample in deep water.After optimizing experiment and analyzing the result, the feature thatwas before and after exploding of sample was observed. Approving crackwhich on the profile can represent the crack which in the cement sample,according to these, it can deduce fracture low inside the cement sample. Through recording the pressure of particular point in cement sample whichwas impacted by exploding wave, the decline of exploding wave pressurewhich is suitable for this experiment is obtained. After dimensional analyzingthe crushed zone, tensile damage zone, the empirical formula amongcharacteristic dimension of these areas, intensity of sample and shock wavepressure is obtained. The crushed zone is about 2~5 times of powdercharacteristic dimension. Tensile damage zone is about 20~30 times ofpowder characteristic dimension. Energy used by exploding wave to generatecrushed and fracture zone is about 2%~7% of the total energy. |
