The Research And Experimental On The Number Of Cracks Calculation Model Of Exploding Fracturing In Oil And Gas Reservoir

At present the oil industry is facing backup unused tension and proved reserves of low permeability oil reserves accounting for a large proportion problems and so on. To effectively use these difficult reservs, Various hydrocarbon reservoir production technology plays an important role. Among them, the hydrocarbon reservoir exploding fracturing made sewing technology plays a good effectiveness, But for the influence factors,the analysis on the crack extension in the process of dynamic and the purpose of fractures and the number of cracks of objective stratum lack of research influence the technological development. This thesis based on solid medicine column combustion analysis,the explosive exploding equation,quality,energy conservation equation and the exploding production state equation, Combining the boundary condition of wellbore exploding fracturing, Established the loading mathematical model under airtight condition of hydrocarbon reservoir exploding fracturing. Research on the relation curves of P - t,T - t in explosive exploding process and the relation curves of P - t,T - tby the different initial pressure,charging quality,inside and outside diameter, initial sPace volume, Based on the loading model reservoir exploding fracturing,formation cracking, and fractures extending is established after five modes'research including calculation model of formation breakdown pressure and crack arrest pressure,model of exploding gas infiltration, model of fractures extending length and width, and model of exploding gas energy and momentum conservation based on fracture initiation loading model of reservoir exploding fracturing process. The variation law of wellbore pressure and fracture geometry is analyzed. Research results show that: wellbore pressure and temperature rapidly increase after explosive's exploding and the wellbore pressure causes fracture initiation as well as fracture extension when it reaches formation breakdown pressure; exploding gas'pressure firstly increase and then decrease to formation pressure under the effect of explosive exploding and gas infiltration. Both of the peak pressure and fracture length decrease with fracture numbers increasing; fracture width firstly increases and then decreases with pressure increasing and the fewer the fracture number is, the bigger the fracture maximum width as well as final width are on the same explode loading condition. According to crack extension model draw the different numbers of crack about the P - t curve, Combined with the actual P - t change curves, Through the curve similarity principle to find the most consistent with actual curve of P - tcurve, Thus speculate the site initiation situation of exploding fracturing cracks. Including the number, crack extension crack length, width, etc; Using the method of level 1 fuzzy comprehensive evaluation, combined with the original experimental data of blast cracking of rock. Studying the influence factor of cracks number , Getting the weights of all the factors, Establishing the prediction model of cracks number. Design 26 groups of testing to get a new experimental data, Verifying the correctness of the model hypothesizes and the precision of the predict model. Through a series of research on exploding fracturing technology for the Parameters design and control provides theory basis, and for the technical development and application has important guiding significance in the site.