These provide access to the central bore of the well underneath most of the heavy valves which should have closed off the flow of oil, but for some reason did not.
In sticky oil production, economy, efficiency, environmental protection for well bore to reduce density is very important.
在稠油开采中，经济、有效、环保的井筒降粘技术是十分重要的。
3
Application of insulation tech for well bore breaks off the heat exchange which is economic and efficient, and has gained a satisfied effect in test for dense oil well of Bohai oilfield.