Drilling is the first step to open and destroy oil and gas reservoirs. If the oil and gas reservoir can be carefully protected during drilling, the oil well output can generally reach the original design index after production, and sometimes it will be higher. If the oil and gas reservoirs are damaged or polluted during drilling, the oil well production will not only fail to reach the target, but also drop sharply sometimes, and even no oil will be produced when the pollution is serious, which is why the protection of oil and gas reservoirs has been emphasized during drilling.
The work of protecting oil and gas reservoirs during drilling mainly includes: mastering the formation pressure profile in this area before drilling; Select the drilling fluid type that matches the lithology and physical properties of underground reservoirs; The density of drilling fluid should be strictly controlled during drilling, and the lower limit value of density in drilling engineering design should be selected as far as possible; Before opening the reservoir, the performance of drilling fluid must be adjusted, and besides the specified density, the water loss and solid content of drilling fluid should be controlled. After the oil and gas reservoir is opened, it is necessary to speed up drilling, quickly complete the well, and shorten the soaking time of drilling fluid to the oil and gas reservoir as much as possible; Sometimes drilling fluid shielding and temporary plugging technology can be used to protect oil and gas reservoirs; In the process of cementing, perforation, induced injection and other operations, oil and gas reservoir protection should also be done well.
Technicians do drilling fluid tests.