Prestressed Cementing Technology and Product for Thermal Production Well of Thick Oil

Technology overview:

By using thermal production well prestressed cementing technology, prestressed cementing of thermal production well with blowout preventer under controlled conditions is realized and effective control of elongation of heated casing while injecting steam in thermal production is also achieved. Thus, reliable hanging of casing at any location is realized. Thermal production casing head and prestressed cementing ground anchor are matching products for this technology which are subject to independent innovation by CNPC. This technology has obtained 15 empowered patents, including 2 foreign ones.

Product name: Thermal production casing head

Product model: RTØ273×Ø178-21 and RTØ340×Ø245-35

Application field:

This product can be applicable to vertical well, directional well or horizontal well for thermal production of thick oil and is also applicable to the cementing operation of various conventional medium and low pressure wells.

 Application effect:

Since 2000, thermal production casing head has been popularized and applied on a large scale in Xinjiang Oilfield, Jilin Oilfield, Chepaizi Oilfield and Kazakhstan Kenkiyak Oilfield. It has been popularized and applied for more than 10,000 wells in all kinds of thermal production wells of thick oil at home and abroad up to now.

Technical parameters

conventional medium and low pressure wells.

Single-stage spec. (mm)

Max. hanging capacity (kN)

Max. working pressure (MPa)

Drift diameter (mm)

Ø339.7×Ø244.5

1174

21

Ø 315

Ø339.7×Ø177.8

1517

21

Ø 315

Ø273.05×Ø177.8

1517

21

Ø 250

Ø273.05×Ø139.7

1004

21

Ø 250

Ø244.5×Ø139.7

1004

21

Ø 220

Two-stage spec. (mm)

Max. hanging capacity (kN)

Max. working pressure (MPa)

Drift diameter of blowout preventer (mm)

Ø339.7×Ø244.5×Ø177.8

1517

35

Ø 346

Ø339.7×Ø244.5×Ø139.7

1004

35

Ø 346