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Technology and equipment for well stimulation by high-energy methods
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Gas generator GDK-100GDK-100 arrangement:


1 – pressure and temperature gauge;

2 – cargos;

3 – head;

4 – charge CCPG-85, CCPG-64, CCPG-38- main;

5 – Igniting charge CCPG-54, CCPG-40;

6 – detonating cord;

7 – cable;

8 – explosive cartridge;

9 – head.

 

Unlike existing analogues, CPG-100 allows to process in two stages.

The first stage is characterized by a high rate of pressure rise, resulting from ignition of the propellant charge of detonating cord. A network of detrital cracks is formed in the hole.

The second stage is characterized by a low rate pressure rise, but increased duration of its effects due to the burning of the main charges, which are inflamed by the products of combustion of mixed charges. This provides further development of cracks into the formation.

GDK-100 gas generator is effectively used in the medium and low-permeability formation, in the reservoir beds with deteriorated reservoir properties of the near-well zone occurred in the course of drilling, development and operation of wells.

 

 


Wave processes in the well as a result of GDK-100 Gas Generator combustion

Wave processes in the well as a result of GDK-100 Gas Generator combustion 


Operation without engaging WO operations crew

The technology of "STS-GeoService" company allows treating the formation in wells with drawn producing string and packer installed system. Works are carried out with the help of small-sized generator CPG-100-38 without the involvement of Workover Operations crew, using geophysical lifts and platforms, as well as coiled tubing units.
 
Operation without engaging WO operations crew



Criterions of the well selection to GDK application

Criterions of the well selection for gas-dynamic treatment of the bottomhole zone on application of gas generator GDK100.

Characteristics

Description

Reservoir rock characteristic

Intergranular porosity terrigenous and poral, fractured and cavernous carbonate reservoir rocks

Lithology

No limits (except for: sand, semiconsolidated sandstown, sandstown and siltstone with shaliness more than 20%)

Well depth, м

No less than 300

Temperature,°C

Maximum 170

Reservoir rock porosity, %.

3-25

Reservoir rock permeability, мкм2.

Maximum 0,30-0,05

Formation thickness, м.

No less than 1

Reservoir pressure decrease, %

Maximum 30-35

Shot density, shot/meter.

 No less than 10

Water-bearing bed distance, м.

No less than 10

Casing and cement conditions

Casing integrity damages and defects of cement stone are not allowed at the perforated zone and up to 200 meters above. 

Presence of packer below treatment interval

not allowed

Dictance from cement bridging to treatment interval, м.

No less than 20 м

Oil-and-gas saturation, %

No less 40

Behind-the-casing flow

not allowed

Gas dynamics fracturing technology by gas generators GDK-100 has the following advantages:

  1. Mathematical modeling of the treatment by the application of the unique software.
  2. Cyclic (two or three tips) treatment with the application of self-contained measuring equipment under the control of our supervisor.
  3. STS-GeoService executes the technological support of the operations: plan and report drawing and presence of our supervisor at the well.
  4. There is not any risk of casing or cement damage;
  5. It is possible to work in open borehole and in cased borehole
  6. It is possible to work through the tubing without well repair team.
  7. It is possible to work through the tubing without well repair team.
  8. It is possible to work through the tubing without well repair team.
  9. As opposed to old charges, GDK-100 charges material is high-performance composite solid fuel. Combustion products of this fuel are hydrofluoric and hydrochloric acids which helps to fix the cracks.
  10. Low cost of works.
  11. Low duration of works.
  12. Special heavy equipment is not required.
  13. High efficiency stimulation after the fracturing.