Potassium carbonate polyamine drilling fluid

Abstract

The invention relates to a potassium carbonate polyamine drilling fluid used for the petroleum drilling process. The potassium carbonate polyamine drilling fluid mainly comprises 1-60 percent of potassium carbonate, 0.5-25 percent of calcium oxide, 0.5-5 percent of polyamine shale inhibiting agent, 0-5 percent of bentonite, 0.5-3 percent of filter reducer, 0.1-0.5 percent of coating agent, 0.1-0.8 percent of tackifier, 0.5-5 percent of plugging agent, 0.1-2 percent of lubricating agent and a proper amount of weighing agent (added according to the requirement). The potassium carbonate polyamine drilling fluid can provide K+ with high concentration and has strong inhibiting capability on shale; the potassium carbonate and the calcium oxide react in equal mole ratio to generate micrometer and nanometer calcium carbonate superfine powder, thus CO32-anions generated by dissolving the potassium carbonate can be removed, the mineralization can be reduced and the influence of high mineralization on the action efficiency of other processing agents can be eliminated; and by matching, the calcium carbonate superfine powder can be deformed into asphalt and paraffin particles which can be usedfor plugging a microcrack shale stratum.

Description

technical field [0001] The invention relates to a drilling fluid used in the field of petroleum drilling engineering, which belongs to a drilling fluid which has a strong inhibitory effect on strong water-sensitive mud shale formations. technical background [0002] Drilling fluid is a working fluid that has many functions during drilling, such as carrying and removing cuttings, cooling and lubricating the drill bit, balancing formation pressure, protecting the stability of the wellbore wall and protecting the oil layer from damage. Its performance directly affects drilling efficiency and downhole drilling. Safety and cost control are important components of drilling engineering technology. [0003] In drilling engineering, we often encounter strong water-sensitive mud shale formations, which are likely to cause complex accidents such as bit bagging, well wall collapse, well diameter reduction, torque increase, and drilling tool jamming, which will bring great harm to drilli...

AI Technical Summary

Problems solved by technology

These anions do not contribute positively to the performance of the entire drilling fluid system. On the contrary, due to the existence of a large number of anions, the salinity of the drilling fluid increases, which reduces the use efficiency of other treatment agents to a certain extent.