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Pumpdown perforating technology

The perforation team at Dragon Oil Technologies Inc. are in charge of setting the bridge plugs and  pumpdown perforation. This technology is primarily used for shale oil & gas development. The operation typically includes perforating, setting bridge plug, hydraulic fracturing.


Equipments and downhole tools

Logging Truck
Benz logging trucks: Five units  
Power: 235kw/320hp  Cable lifting speed: 120m/h——11000m/h 
 
Wellhead blowout control equipment
 
Blowout control equipment: Hunting 105Mpa and Elmar 70Mpa
Operation capacity: Provide services for more than 10 wells simultaneously.
High pressure capability: Used in wells at the bottom hole pressure over 95Mpa.
 
Downhole tool series 
 
DYNA multi-stage ignition system: Ten sets 
Type: Electronic multi-stage optional launching
Temperature rating: 175°C
Pressure rating: 140 Mpa
Perforating gun: 89mm diameters & 20 perforations/m 
 
Bridge plug and setting tools 
 
Fast-drilling bridge plug
 
 
Temperature rating: 121-177°C
Pressure rating: 56-105Mpa
Setting tool: Ten sets of Baker 20# 
 
Technology Highlights
  •Unified-perforation type perforating technology.
  •After perforated by DPEX perforating bullet, the perforated trajectory will be cleaned automatically.
 
Unified-perforation type perforating bullet 
 
 
Ordinary perforating bullet 
 
 
 
Principle of unified-perforation type perforating bullet 
 
Perforation bullet
    The explosive for all the perforating bullets are the same: RDX\HMX\PYX
Different perforating bullets only differ in the design of liner and cartridge. 
 
Unified-perforation type perforating bullet 
  •The design of liner angle differs from that of ordinary perforating bullet; it can control the explosive within energy collection and scattering.
  •After ignition, the set flow will be in the shape of column and launched toward the ground.
 
Ordinary perforating bullet 
  •The liner design makes the explosive more energy-gathered.
  •After ignition, the set flow will be in the shape of cone and launched toward the ground. 
 
DPEX self-cleaning perforating bullet 
 
 
 
Principle of self-cleaning perforating bullet 
 
Perforating bullet 
  •The explosive for all the perforating bullets are the same: RDX\HMX\PYX
  •Different perforating bullets only differ in the design of liner and cartridge 
 
Self-cleaning perforating bullet 
  •Reactive metal material is adopted for the liner.
  •After perforating, exothermic reaction of reactive metal material will occur in the trajectory along with the jet flow.
  •After exothermic reaction, ultrahigh pressure will generate in the trajectory, so the perforating fragments will flow back to the shaft along with the fluid.
  •The ultrahigh pressure in the trajectory will last for a while, so the fragments in the trajectory will be cleaned up and the trajectory will be clean.
 
Ordinary perforating bullet 
  •Inert metal material is adopted for the liner.
  •After perforating, the liner will melt or be blasted into fragments. 
 
Oriented perforating 
    Oriented perforating technology: It realizes the oriented perforations at different positions in a single trip. Contrast to realize the oriented perforation at a position in the past, the operator needs to run the tools in the well for three times: at the first time, set the bridge plug with locationing slot; on the second time, lower the gyroscope to measure the relative azimuth of the locationing slot; at the third time, put the perforation gun into the locationing slot to perforate the well. 

 
Case study
 
 
Result:
    The max. pumping pressure of the first stage of JY31-3HF well is 82Mpa; and no leakage was found in the Hunting 105Mpa wellhead blowout control equipment. 
 
 
 

Since 2012,  618 wells with more than 7000 stages were implemented in JiaoshiBa oil & gas fields, Northeast oil field, Yangchang oil field, East China oil field, and Puguang oil & gas fields.