Abstract
In order to increase the production of low permeability reservoir inclined or straight well, establish effective communication between the sand and improve development effect. For Daqing periphery low permeability oil field properties, such as large sandbody permeability difference, plane fast phase transition, narrow sandbody and scattered distribution. A straight and inclined well hydraulic fracture stimulation modification technology research and field application was launched. Studied the mechanism of crack generation in the hydraulic drilling hole and analyzed factors of crack situation in the hole of hydraulic drilling fracture, given parameter optimization method of hydraulic drilling fracturing, carried out hydraulic drilling fracturing on spot well selection test. The results show: At reservoir heterogeneity geo stress conditions, after the hydraulic drilling, the fracture cracks always rupture on contact surface of well and hole and then the crack extend along the direction of maximum horizontal stress. So reservoir heterogeneity is a necessary condition for generation of cracks in the hole. To make cracks in a certain position of hole after the hydraulic fracturing, reservoir heterogeneity must be a prerequisite, that there exists natural fractures in reservoir or geo stress heterogeneity. Pressure curve and fracture pressure curves intersect multiple cases. In these cases there will be many perforations along the crack. Considering the stress orientation, petrophysical, sedimentary facies, hole geometry parameters, the overall design system of hydraulic drilling fracturing parameters optimization is given. On spot selected well got a good effect. Liquid production increased to 4.8 from 1.7 tons. Oil production increased to 4.2 from 0.9 tons.
Highlights
Daqing periphery oil field is low pressure, low permeability and low abundance oil field (Chen and Luo, 2006)
In order to increase the area of a single well control, improve well production and improve performance, it needs to establish effective communication between the plane sand, this is conducive to the fluid flow information (Surjaatmadja, 1998)
Analysis the mechanism of generation of cracks in the hydraulic perforation hole: Reservoir heterogeneity is a necessary condition for the formation of cracks in the hole: By finite element simulation results show that: Reservoir at condition of situ stress heterogeneity hydraulic drilling hole and borehole wall contact surfaces are most likely to rupture area
Summary
Daqing periphery oil field is low pressure, low permeability and low abundance oil field (Chen and Luo, 2006). On the basis of the generation of holes by hydraulic drilling, reservoir fracturing techniques were applied to improve the use of the degree. Production of hydraulic fracturing wells are mainly affected by the direction and length of the crack extension (Zhang et al, 2010). Affected by formation stress distribution, after the formation is fractured and the length and the extension direction of the crack may not develop according to the design of the expected results. Technol., 11(5): 480-487, 2015 always generated along the direction of maximum horizontal stress after hydraulic fracturing drilling (Fig. 1b). That is to say fracture after hydraulic drilling under the conditions of heterogeneity situ stress reservoir. Through the above analysis: Reservoir heterogeneity is a necessary condition for the formation of cracks in the hole, that to make fracturing after the hydraulic punch, generation of (a) cracks in a certain location of the hole. The cracks form in the hole in the lower fracture pressure micro fracture zone (Van de Ketterij and de Pater, 1997)
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