The preferred proppant

The preferred proppant
Hydraulic  Fracturing proppant  is opened after cracking are laminated, not to crack fracture for supporting a solid particulate reclosed. Use of hydraulic  frac proppant.purpose is to support the hydraulic fracture, formed in the reservoir oil is much higher than the propped fracture conductivity zone, ideal propped fracture conductivity should

produce their liquid, the pressure within the fractures Landing is zero, both infinite conductivity. Thus, due to the high conductivity of the support joints existence of the

percolation wells manner by the radial flow into a linear flow, but also increases the percolation area, so as to increase production by injection purposes. Therefore, the

choice of  Proppant  is critical.
Determine proppant type, particle size and laid in cracks in fracturing design concentration is an important part, but also to ensure after pressure increase and improve the

level of development of the key. General is expected to be obtained fracturing effect is needed to fracture conductivity proppant preferred, therefore the preferred proppant

without reservoir conditions, engineering conditions, and proppant indoor evaluation results.
In the past we mainly based on laboratory determination of the different types and size of proppant closed under pressure at different rates and crushing fracture conductivity

is preferably provided proppant without considering the reservoir properties on fracture conductivity requirements did not take into account the fracturing fluid residue in situ

conditions and long-term effects on the conductivity. To solve these problems, we have launched a proppant preferred technology research, and finally determine the preferred proppant factors should be considered and preferred method.
2, the selection step ① use, give a crack supporting half-length Xf: ② using the formula to calculate the 30-day dimensionless time tD; ③ According to the table to choose the best values ??of the dimensionless conductivity; ④ calculated in the most Optimization dimensionless conductivity proppant permeability needed; ⑤ establish common proppant conductivity and closing pressure curve; ⑥ calculate the effective proppant permeability and dimensionless fracture conductivity; ⑦ be elected meet the requirements of the type and size proppant.
Given the current status of the status of my bureau proppant (mainly quartz sand ), while according to our many years of field experience, closure pressure ≤ 10MPa using quartz sand; closure pressure 10-20 MPa, the main use of quartz sand, chase Part ceramic, closure pressure ≥ 20 MPa, the main use of ceramic, particularly high  pressure for closed wells, you must use high-strength ceramic.