Research And Experimentation On Well Productivity Model Of Exploding Fracture In The Wellbore

Under the condition that petroleum resource has been more and more shorten, low permeability reservoir has been the exploiting theme in china even the whole world. Fracturing technology is very important to improve exploiting low permeability reservoir's effect and exploit unused low permeability reservoir as valid as possible. As one of Fracturing technology, Exploding in the wellbore technology produces favorable effect to increase production and injection and raise oil yield. But it causes unfavorable effect to itself further development that lacking of study to exploding in the Wellbore fracturing well productivity now. Based on the law of exploding in the wellbore technology and the theory of fluid flow in porous media, two forecast models of exploding in the wellbore technology capacity are established separately using the nodal system analysis method and conformal transformation method. Calculation and analysis is conducted at the example of F31-10 oil well basic data using exploding in the wellbore capacity forecast software established by VB program language. Stimulation ratio, fluid productivity and IPR curve when Reservoir characteristics and exploding fracture characteristics are different are obtained and analysis is conducted. Based on the similar principle of current filed and fluid flow in porous media pressure field, electric analog experimental apparatus is established to study the effect to the reservoir fluid flow in porous media and oil well productivity by exploding fracture. Comparative analysis is conducted with computational solution of oil well productivity forecasting mathematics model. Based on the similar principle of temperature field and current filed, the value of each characteristic in temperature field analysis is established. Realistic analysis about productivity forecasting mathematics model is conducted using ANSYS thermal stable analysis model. Findings demonstrate fractures produced by exploding fracturing are favor of increasing oil well productivity. Well productivity increase as fracture length, fracture number and fracture flow conductivity increasing. Fracture length's raise can increase oil well productivity largely. Fracture number's raise can increase oil well productivity. Fracture flow conductivity's raise can increase oil well productivity a little, but fracture flow conductivity's add can increase oil well productivity larger when fracture length increasing. Hence, the increase of fracture length and fracture number is more beneficial than fracture's for F31-10 well in the low penetrative reservoir. Electric analog experimentation result demonstrates that fluid medium is radial flow far away from exploding fracture. Isobaric lines are influenced by fracture more heavily when close to exploding fracture and bent to trend to parallel with exploding fracture around exploding fracture after exploding in the wellbore technology creating exploding fracture. All of those indicate that linear flow become more obviously as close as to the exploding fracture. The nodal system analysis method's average error is 12.02% and conformal transformation method's average error is 4.95% by the mean of comparative analysis between productivity mathematical model calculation result and electric analog experimental result. Isothermal line distribution obtained by ANSYS thermal stable analysis model demonstrate that exploding in the wellbore technology can improve fluid medium's flow condition. The nodal system analysis method's average error is 7.6% and conformal transformation method's average error is 6.13% compared with thermal stable analysis. Findings have a guiding role for the use of exploding in the wellbore technology in oilfield.