What are the requirements of wellhead installation?
1. Selection and pressure test of wellhead equipment. The wellhead device should be determined according to the high construction pressure of fracturing and acidizing design, that is to say, the nominal pressure of the selected wellhead device must be greater than or equal to the high pressure of the construction design. Before installation, the wellhead device must be tested as a whole and can only be put into the well after passing the pressure test. For oil wells, the pressure test shall be conducted according to the water seal pressure test standard, and for the gas well, the pressure test shall be conducted according to the gas seal pressure test standard. Casing nipple, bottom flange and casing Cross shall be installed in sections, and wellhead equipment shall be used to protect casing thread and ensure thread quality. The installation of the above parts of the casing cross can be determined according to the construction requirements.
2. Inspection and installation of casing nipple of wellhead equipment. The material and specification of the casing nipple at the corner of 0 killing well shall be consistent with the casing connected in the well. All annealed parts shall be removed and not used to ensure the strength of casing nipple. The new fastener of wellhead device shall be smooth and smooth without burr, and pass the pressure test (the pressure test standard is 80% of the original manufacturer's pressure test value, and the remaining 3-3 should be left after hand tightening at the wellhead. 5 thread refers to 8 thread / inch casing. If there are too many or too few remaining threads, it can not be used.
The steel ring of wellhead device is made of low carbon steel, which is soft and should be prevented from being damaged. During the installation of wellhead device, pay attention to check the steel ring and steel ring groove, which shall be free of damage, rust and soil, and be cleaned. When tightening flange bolts, tighten them diagonally to make the flange flat. After installation, the four corners of the wellhead device are balanced and clamped with steel wire rope. Selection and pressure test of wellhead equipment. Inspection and installation of casing nipple. Installation of wellhead equipment.