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Home > News > How to deal with different formations when drilling wells
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How to deal with different formations when drilling wells

Drilling is a relatively professional job. Because the operation of each step is related to the fact that the well is not strong and will cause accidents. In the process of staff construction, the failure of the well-Drilling Machine is the most influential problem, so what should be done when encountering such a problem?


Different geological layers should be taken in different ways during the drilling of the well drilling machine, so that the good results can be achieved, and the different geological layers that are encountered are also necessary, the sand layer and the gypsum layer. It is often encountered. Once gypsum intrusion occurs in the drilling machine, the calcium ion can be removed by adding soda ash, calcium removal viscosity reducer, etc., and the viscosity-reducing agent with strong anti-calcium ability can be used to control the adhesion and replenishment. Fluid loss additives, anti-collapse agents and other materials to maintain the stability of drilling fluid performance.


Before drilling the gypsum layer, pre-treat the drilling fluid, reduce the solid phase, reduce the sticking, add the anti-gypsum treatment agent (such as soda ash, calcium removal viscosity reducer, etc.) in advance, and prepare the gypsum in advance according to the adjacent well construction data. Layer of treatment agent. Increase the pH of the drilling fluid to improve the ability of small drilling machinery drilling fluids to resist gypsum contamination.


When drilling the runoff formation, it is necessary to increase the viscosity of the drilling fluid and increase the content of bentonite in the drilling fluid. Generally, the requirement is more than 10%. Adding a single seal to enhance the wall-forming property of the drilling fluid, and reducing the convective sand by appropriately reducing the displacement in the project. Layer erosion, the drill must be closed with thick mud with viscosity greater than 80s before drilling to ensure that the small drilling machinery is drilled, electrically measured, and the casing is smooth.


Quartz sandstone is a very hard rock. During the drilling process, the footage is often slow. When a meter is used, a two-meter sand may appear. The drill has a strong beating, more slag and rock cutting, and a drilling accident. Therefore, small-scale drilling machine operators are required to have a detailed understanding of this terrain.


Clear water does not have the same lubricity as mud. When it encounters hard rock drills, it will be more powerful. The rock will be shattered when the drill is beating. The sorting of clear water is larger, and the larger the rock is. Can not be taken out of the hole by the rinsing liquid, the sand-like rock cutting is floating in the hole and always in the hole. If the powder feeding tube is used, there may be a phenomenon that two meters of sand may appear in a meter. If slightly Inadvertently, the drill may be buried, and the sand will bring more trouble to the clear hole.


Quartz sandstone is formed by sedimentation and belongs to extremely hard rock. The holes drilled in the drilling process of small drilling machine are relatively shallow (30-200 m), so they are generally made of water using diamond drill bits. Drilling of the slurry often occurs: the footage is slow, and two meters of sand may appear in a meter of footage. The drill has a strong beating, more slag and rock cutting, and a drilling accident.


Solution: If drilling with mud is not economical, there is only another way to find ways to reduce the beating of small drilling machines to reduce the generation of sand. You can add nitro acid and alkali adjuvants to clear water. The function of vibration lubrication, so that the drilling tool can be beaten and the sand is generated, so as to keep the hole clean and finally solve the problem!

When the basalt strata are prone to micro-crack development and fragmentation during well drilling, it is prone to run-out and should be prepared in accordance with the leaky formation.

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