The development of oil and gas fields is a complex and comprehensive project composed of exploration, drilling, underground operation, oil recovery, gathering and transportation.Large quantities of chemicals are required in each operation.

As an important auxiliary material for geological exploration, drilling additives have been studied and used for many years at home and abroad, and hundreds of related products have been developed.

Drilling fluid is also known as drilling mud.Its function is to break the core, carry cuttings, lubricate the cooling bit, balance the formation pressure and protect the wellbore.Maintaining good mud performance is an important means to improve drilling speed and ensure downhole safety, and the treating agent is the key to ensure mud optimization.Drilling fluid and completion fluid treatment agents account for about half of oilfield chemicals.

Cementing cement additive

1. Fluid loss agent

The materials that can reduce the filtration loss of cement slurry are collectively referred to as water loss reducing agents of the cement slurry. Currently, the commonly used water loss reducing agents include polyacrylamide, carboxymethyl cellulose and organic acid compounds.

1. Drag reducer (diluent, dispersant, water reducer, turbulence regulator)

Turbulent pumping of grout can often yield satisfactory results. Drag reducers can control the flow of grout and cause turbulent flow at low pump rates.Sulfomethyl tannin, tannin lye and sulfomethyl lignite have good drag reduction effects in a certain content range.

1. Thickening time regulator

Due to the different cementing depth, the cement slurry is required to have an appropriate thickening time to meet the requirements of safe operation.

Thickening time regulators include coagulant and retarding spines.A coagulant is an additive that can make cement solidify quickly, commonly used calcium chloride, sodium chloride.Ammonium chloride, etc.Retailers are additives that can prolong the solidification or thickening time of cement slurry. Commonly used retarders include lignosulfonates and their derivatives, salts of hydroxycarboxylic acids (such as citric tartaric acid) and their derivatives.

1. Specific gravity regulator

According to different formation pressure conditions, the different density of cement slurry is required. The additives that can change the density of cement slurry are called specific gravity regulators, including lightening agents and weighting agents.Lightening agents are bentonite (also known as soil removal), hard asphalt, etc.Weighting agent has barite, hematite, sand, salt and so on.