For the development of Yunnan Chihong Co. deep lead zinc resources, Beijing Research Institute of Mining and Yunnan Chihong Co. creatively developed "and the like may be floating - Asynchronous selected from lead - zinc sulfur asynchronous mixture selected from - Lead-zinc-sulfur separation-lead-zinc-zinc mine does not de-sludge vulcanization potential control flotation" new technology, and successfully applied to the beneficiation process of complex refractory lead-zinc sulfide oxidation mixed ore, the technology has made a breakthrough.
1. According to the close relationship between lead sulfur and zinc-sulfur, the lead-zinc sulfur is divided into two parts according to the principle of floatability: the “lead-sulfur†part and the “zinc-sulfur†part, for the first time, the two processes of asynchronous and equal floatation The core technologies are organically combined to form a floatable asynchronous flotation and mixing process structure, which becomes the backbone process of sulfide ore flotation; the use of effective targeted collectors ensures gold in lead, zinc, sulfur, silver and antimony. The genus is recycled to the maximum extent, ensuring the separation of lead sulphur at low pH, which creates the necessary conditions for the effective flotation of subsequent oxidized ore.
2. The new technology of lead-zinc-free ore-free desulfurization and flotation flotation solves the problem that the lead-zinc oxide minerals and gangue minerals in the ore are both carbonate minerals and high degree of muddyness, and it is a breakthrough in obtaining the technical index of mixed ore flotation. Key technologies for sexual progress.
The final mineral processing product has a simple structure and is easy to operate and manage. The technology has reached the international leading level as a whole.
Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells or wellbore.
It is inserted into a well bore and cemented in place to protect both subsurface formations and the wellbore from collapsing and to allow
drilling fluid to circulate and extraction to take place
The oil casing is a steel pipe used to support the well wall of oil and gas wells to ensure the normal operation of the whole well during drilling and after well completion. Several layers of casing shall be used for each well according to different drilling depth and geological conditions. Cement shall be used for cementing after casing is put into the well. It is different from TUBING and drill pipe and cannot be reused. It is a disposable consumable material. Therefore, casing consumption accounts for more than 70% of all oil well pipes.
Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells, or wellbore. It is inserted into a well bore and cemented in place to protect both subsurface formations and the wellbore from collapsing and to allow drilling fluid to circulate and extraction to take place.
Surface casing
- Protects the well from contamination in shallow water and gas layers.
- Supports the wellhead equipment and sustains the weight of the other layers of casing.
Intermediate casing
- Isolates different layers of pressure to facilitate normal circulation of drilling fluid and protect the production casing.
- Intermediate casing facilitates the installation of blow-out preventers, anti-leakage devices and tailpipes in the well.
Production casing (oil string)
- It is the conduit through which oil and gas pass from a below surface reservoir.
- It protects the well and separates fluids into various layers.
First, green pipes are threaded on each end. The threading is then inspected and, if necessary, rethreaded to ensure that the thread accurately connects to the coupling. The threading type includes STC/BTC/LTC. The casing pipes are strengthened by surface treatment and are subject to various inspections, including drifting and hydrostatic tests before they are coated and packaged into casing.
Casing pipes are ordinarily produced with outside diameter sizes of 114.3 mm to 508.0 mm.
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