High roughness cover of tungsten carbide throughout inside diame- ter provides reliable core catching during brake-off and pulling-out

Core Barrels

Core barrels are designed for coring with downhole hydraulic motor or rotor in formations of I-III category of recovery difficulty using core heads equipped with PDC cutters, thermally stable polycrystalline (TSP), impregnated diamonds or its combination.

High quality bare pipes of domestic and foreign manufacturers are used in producing core barrels. All components pass strict quality control.

Core barrel design is multi-purpose and allows using one barrel for coring isolated and non-isolated core due to using fiberglass core tubes and insulating fluid.

Core barrel includes all auxiliary tools and spare parts necessary for make up and lay down operations at rig site.

In accordance with the customer requirements, core barrels can include:

  • Crossover sub with changeable nozzles that limits flow rate through barrel and core head during coring with hydraulic motor, operation of which requires high flow rates;
  • Spiral centralizers, diameter of which is selected depending on concrete drilling conditions;
  • Insulating fluid «IZOKOR» produced by «BURINTEKH», Ltd with high rheological properties, adhesion, lubricating capacity, which allows preventing filtrate penetration into core material.

  • Increased body diameter and reinforced threads increase service life and provide continuous trouble-free operation of core barrel;
  • Core tube tapered thread considerably speeds up make up and lay down operations;
  • Inner core tube suspension design allows making fast clearance adjustment between core head and inner-tube shoe and, if necessary, change standard heavy series thrust bearing within 10-15 minutes at rig site;
  • Collet core-cutters have necessary elastic characteristics due to special heat treatment technology and equipped with high roughness cover of tungsten carbide throughout inside diameter, which provide reliable core catching during brake-off and pulling-out operations;
  • The variety of toggle-type core catchers allows selecting overlapped core tube cross-section area depending on type of formation for reliable core keeping during pulling out operation;
  • Spiral centralizers decrease vibrations and fluctuations and allow increasing of core recovery percentage in fissured, cavernous and broken formations.

SK-102/52

Applied core head diameter, mm

121…142.9

Core diameter, mm

52

Outside body diameter, mm

101.6

Centralizer diameter, mm

118…138

Quantity of sections

1

Maximal operating length, mm

5,710

Core recovery effective length, mm

5,000

Connection threads:
- top box*
- bottom pin


Z-86
NKT-102

SK-127/80

Applied core head diameter, mm

138.1…152.4

Core diameter, mm

80

Outside body diameter, mm

127

Centralizer diameter, mm

138…144

Quantity of sections

1

2

Maximal operating length, mm

6,300

11,300

Core recovery effective length, mm

5,000

10,000

Connection threads:
- top box*
- bottom pin


Z-102
MK 12441:16 Sp

SK-178/100 (178/80**)

Applied core head diameter, mm

212.7…220.7

Core diameter, mm

100 (80)

Outside body diameter, mm

178

Centralizer diameter, mm

206…212

Quantity of sections

1

2

Maximal operating length, mm

9,700

17,200

Core recovery effective length, mm

7,500

15,000

Connection threads:
- top box*
- bottom pin


-133
MK 16561:16 Sp

SK-178/100 «Long»

Applied core head diameter, mm

212.7…220.7

Core diameter, mm

100

Outside body diameter, mm

178

Centralizer diameter, mm

206…212

Quantity of sections

1

2

3

Maximal operating length, mm

8,150

14,190

20,230

Core recovery effective length, mm

6,400

12,400

18,400

Connection threads:
- top box*
- bottom pin


Z-133
MK 16561:16 Sp

SK-178/100 «Long4»

Applied core head diameter, mm

212.7…220.7

Core diameter, mm

100

Outside body diameter, mm

178

Centralizer diameter, mm

206…212

Quantity of sections

1

2

3

4

Maximal operating length, mm

8,150

14,190

20,230

26,270

Core recovery effective length, mm

6,400

12,400

18,400

24,400

Connection threads:
- top box*
- bottom pin


Z-133
MK 16561:16 Sp

SK-178/100 «Long5»

Applied core head diameter, mm

212.7…220.7

Core diameter, mm

100

Outside body diameter, mm

178

Centralizer diameter, mm

206…212

Quantity of sections

1

2

3

4

5

Maximal operating length, mm

8,150

14,190

20,230

26,270

32,130

Core recovery effective length, mm

6,400

12,400

18,400

24,400

30,400

Connection threads:
- top box*
- bottom pin


Z-133
MK 16561:16 Sp

SK-178/100 «Long».Y

Applied core head diameter, mm

295.3…311.2

Core diameter, mm

100

Outside body diameter, mm

185

Centralizer diameter, mm

287…303

Quantity of sections

1

2

3

Maximal operating length, mm

7,930

13,970

20,010

Core recovery effective length, mm

6,400

12,400

18,400

Connection threads:
- top box*
- bottom pin


Z-171
Z-189

* — tool having any connection thread may be produced depending on customer requirements.
** — core barrel SK-178/80 with core diameter 80 mm may be produced from core barrel SK-178/100.