Mode of action classification of drilling fluid anti sloughing agent

At present, drilling fluid anti sloughing agents are only classified according to their chemical composition, such as Potassium chloride, silicate, calcium chloride, etc. of inorganic salts; Partially hydrolyzed polyacrylamide, amphoteric composite ion polymers, cationic polymers for polymers; Sulfonated asphalt, oxidized asphalt, natural asphalt powder of asphalt; Humic acid potassium its cross-linking compound with resin; Low molecular organic compounds such as glycerol, methyl glucoside, small cations, certain surfactants.

In order to give full play to the coordination effect complementary effect of anti sloughing agents with different composition categories on the anti sloughing effect, so as to correctly use anti sloughing agents improve their performance, it is necessary to classify anti sloughing agents according to the Mode of action of anti sloughing. Drilling mud additives

The primary reason for the instability of the wellbore is the diffusion of pore pressure, which is caused by the entry of drilling fluid filtrate into the pores of the rock, resulting in a high pore pressure. The effective binding force between mineral particles decreases, the strength of the rock also decreases. Secondly, the non chemical bonding force between mineral particles such as clay in the formation, such as hydrogen bonds, is destroyed by water,

For example, clay hydrates, expands disperses, Anhydrite absorbs water expands into dihydrate gypsum, water-soluble salt rock is dissolved. These chemical factors that cause instability of the wellbore only take effect when water enters the rock layers of the wellbore the wellbore. Therefore, there are two effective ways for anti collapse agents:

One is to prevent delay water entering the rock pores of the wellbore, that is, to eliminate reduce the driving force of water migration the resistance of large water migration;

The second is the binding force between mineral particles in large rocks.

Hebei Huayun Hongye Chemical Co., Ltd. is a joint venture established with Hong Kong Diyun Investment Co., Ltd. The company mainly produces sells oilfield chemical products resin products. We also undertake on-site technical services for mud, are a technology-oriented enterprise that integrates technology development, production sales, technical services, with high-tech products as its orientation.