Mud mud during oil drilling

Drilling mud additivesWhen drilling, the mud used has three major functions: firstly, it suspends the continuously broken rock particles of the drill bit returns them to the ground with the mud, allowing the drilling to continue; Secondly, when there is a warning of a blowout, using mud with a larger specific gravity can prevent the well blowing out (its pressure plays a balance role with the formation pressure); Thirdly, when entering the target layer, light mud can be circulated to prevent the cracks in the target layer being blocked prepare for fracturing increasing production.

Due to different needs during the drilling process, the mud needs to be modified at any time. These additives used for mud modification are mud additives. Such as barite powder (used for well killing), suspension agent of macromolecular materials, etc.

It takes two more people to complete the mud mixing process with minimal mud production. There is no need for a mud mixing tank to add 4 out of 10000 powder of Jingchuan chemical mud (with a viscosity of about 25 seconds), so it is convenient. Rushan only needs an auxiliary worker to spray the Jingchuan mud powder along the way. Easy to change quality, etc.

Reason for slurry leakage accident: In a highly permeable sand gravel layer, the slurry leaks out towards the outside of the hole wall, the casing is buried too shallow, the backfill soil is solid enough, resulting in slurry leakage at the blade foot. The casing is well made, the joints are tight, resulting in slurry leakage. The water head is too high, the water column pressure is too high, causing the hole wall to leak slurry, the drilling hole passes through the karst cave. Preventive measures for slurry leakage: Use thicker high-quality slurry drills

Holes. When burying the casing, the soil around the casing should be compacted in layers, the soil quality should be selected with clay with suitable moisture content.

The proportion of slurry has a significant impact on the performance of the slurry. Generally, the proportion is prepared at a rate of 0.01% -0.1%, the proportion should be determined based on on-site testing. Reference indicators: The viscosity index is measured using a 1006 type Martensian funnel. The mud ratio is based on the formation condition, mud powder (kg? Cubic water), viscosity (seconds).

During normal construction, a dedicated person should be responsible for making slurry to ensure the height of the slurry level. The time, frequency, weight of adding polymer mud shall be strictly prepared according to the calculated average amount. 5. When drilling to a depth of nearly 3-5 meters, the addition of aggregates can be stopped

Material slurry. 6. If the gravel layer in the sand layer is too large, the hole wall is unstable, the leakage amount is too large, adjust the material dosage appropriately according to the water volume. For reference only.