Hydrolyzable polyacrylamide (PHPA) is a high molecular polymer that is widely used in the drilling industry. It has good hydrolysis performance and high viscosity, which can effectively improve the suspension ability of drilling fluid and carry cuttings. ability, thereby protecting the well wall, increasing drilling speed, and preventing drill sticking.
The application of hydrolyzable polyacrylamide (PHPA) in drilling is mainly reflected in the following aspects:

Flocculation: Hydrolyzable polyacrylamide has strong flocculation properties and can flocculate mud and cuttings during drilling to form larger flocculation groups, which facilitates cleaning of the bottom of the well.

Adjusting the rheology of drilling fluid: As a drilling fluid regulator, hydrolyzed polyacrylamide (PHPA) is often used, which is obtained by hydrolyzing polyacrylamide. Its function is to adjust the rheology of drilling fluid, carry cuttings, lubricate the drill bit, reduce fluid loss, etc.

Prevent well wall collapse: Hydrolyzable polyacrylamide (PHPA) can protect the sol particles in the drilling fluid and prevent well wall collapse through multi-point adsorption, gel protection and sealing effects.

Plugging effect: During the drilling process, drilling fluid will lose water due to geological structure. Polyacrylamide can be used to plug leaks in cracks and loose rock formations.

Improve lubricity and stability: Hydrolyzable polyacrylamide (PHPA) can improve the lubricity and stability of the mud, reduce water loss in the drilling mud, effectively prevent and de-stuck the drill, and improve drilling efficiency.

Cross-linking: Cross-linking can also occur under the action of Al3+, Fe3+, Ca2+ plasma. Part of the polymer compound changes from linear to colloidal, insoluble in water, adsorbed on the well wall and plugs the formation voids, preventing the loss of drilling fluid.

In general, the application of hydrolyzable polyacrylamide (PHPA) in drilling is mainly reflected in flocculation, adjusting the rheology of drilling fluid, preventing well wall collapse, plugging leaks, improving lubricity and stability, and cross-linking.