Research Of Fracturing Hydraulic Sand Blasting Perforation Combination Technology

Perforation completion method is the most commonly used drilling and well completion method in petroleum engineering. Due to the conventional perforation completion method not only produces the hole depth relatively shallow, but also the compaction zone formed around the perforations in the pollution, the compaction zone will reduce the permeability of oil and gas compacted zone, which seriously hindered the flow of crude oil to the well. In view of the above reasons, we can use the technology of hydraulic perforation fracturing. Hydraulic fracturing perforation is one of the new stimulation technology which is set jet perforating, fracturing and acidizing and hydraulic isolation in one..Fracturing hydraulic sand blasting perforation combination technology is combined by two kinds of hydraulic jet fracturing technology, one of its biggest characteristics is the location of fracture initiation perforation location. Hydraulic perforation technology is based on the continuity equation, the nozzle diameter growth rate. The specific operation is to a certain proportion of the articles the liquid abrasive sand, the sand carrying fluid pressurized by ground pump through the tubing conveyed to the downhole perforating device, perforating in formation part, makes the establishment of liquidity channels between the reservoir and wellbore. With adding a certain proportion of sand in liquid abrasive, pressurized by ground pump, underground perforating device to convey through tubing, in the formation of injection clean pore, reservoir and wellbore flow channel establishment; the technology of Hydrajet fracturing is based on the basic principle of Bernoulli equation, the high pressure fluid potential energy into kinetic energy, to convert kinetic energy into potential energy, fixed-point booster, the realization of fixed-point booster, through the high-speed fluid in the formation of holes formed directly on the bottom of hole, from above the pressure potential formation breakdown pressure, in order to achieve the purpose of improving the conductivity of the reservoir diversion. In this paper, the water jet perforating mechanism, hydraulic fracturing mechanism is discussed, from the theory of hydraulic fracturing is feasible and advanced, and discusses some aspects of jet fracturing process control. Through comparison and Research on a series of hydraulic sandblasting perforating and fracturing technology for the analysis of key points; at the same time to find the appropriate parameters of the tools and reasonable overall design of jet fracturing tools and improvement methods.This paper will further solve the nozzle, the gun body wears and so on, the runner shape and geometry optimized Hydrajet fracturing tool used by the nozzle, the nozzle structure parameters optimal. At the same time to solve the transformation of old wells, refracturing, induced fracture direction of fracturing.