Glucoheptonate drilling fluid

Abstract

The invention relates to a gluconate drilling fluid used in the petroleum drilling process, which mainly comprises 0.1 to 150 percent of gluconate, 0-10 percent of slope earth, 0.5-5 percent of fluid loss additive, 0-5 percent of plugging agent, 0.2-0.8 percent of pH regulator and proper amount of weighting agent (added according to needs); each component is measured according to the percent weight in volume of the drilling fluid. Compared with the currently used inorganic salt and organic salt drilling fluid inhibitors, the gluconate not only ionizes cations having inhabiting function to clay such as K<+>, Ca<2+>, and the like, like the inorganic salt and organic salt drilling fluid inhibitors, but also has the wanting performance of the inorganic salt and organic salt, specifically, the generated anion glucose acid radical by ionization can be coated on the surface of the clay through the absorption between the hydroxyl in the molecule and the clay, thus playing a role of inhibiting hydration expansion and hydration dispersion of clay shale. The gluconate drilling fluid has the advantages of low cost and no environmental pollution.

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 water-sensitive shale. technical background [0002] Drilling fluid is a working fluid that has multiple functions during the drilling process, 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, downhole safety and Cost control is an important part of drilling engineering technology. [0003] In oil exploration and development, due to the wide distribution of the work area and the complex geological conditions encountered, the drilling practice of a large number of complex wells shows that the problem of wellbore instability in shale well sections has always been a technical problem that ha...

AI Technical Summary

Problems solved by technology

[0008] 3. Organic salts are added to the drilling fluid. In order to improve the inhibition of the drilling fluid, the amount of organic salts is very large, as high as more than 60%. While providing inhibitory cations, the content of anions is also increased. These large amounts of organic salts Anions increase the plastic viscosity of the drilling fluid, which affects the performance of the drilling fluid, making it difficult to control the rheology of the drilling fluid during use

[0009] 4. Adding organic salts to the drilling fluid increases the cost of the drilling fluid due to the large amount added