After drilling, various operations in the oil and gas layer for oil and gas wells to be put into production, such as oil and gas layer testing, cementing, perforation, installation of downhole tools, and production and production of oil and gas are called completion operations and are used for completion operations The various fluids are called completion fluids. Various maintenance operations performed after the oil and gas wells are put into production, such as replacing downhole equipment, sand flushing and salvage, etc., the fluid required is called workover fluid. In the process of completion and workover of oil and gas wells, various fluids enter and exit the formation channel, which inevitably causes different degrees of damage to the oil and gas layer. In order to protect the oil and gas layer and improve recovery, it is necessary to prepare a high-performance completion fluid And workover fluid. Shandong Ruihai Mishan Chemical Co., Ltd. has various types of polyacrylamide, which have outstanding effects in the completion and workover stages.
Fluid loss control agent: In order to reduce the filtrate of completion fluid and workover fluid entering the oil and gas layer, and to protect the oil and gas layer, fluid loss control agent should be added to the completion fluid and workover fluid. The types and usage of fluid loss additives are similar to those used in drilling fluids.
Thickener: In order for the workover fluid to be able to suspend the weighting agent, a thickener must be used to increase the viscosity and shear of the workover fluid. High-molecular-weight acrylamide polymers can be selected, and if necessary, appropriate cross-linking agents can be added to moderately cross-link the polymers.
Clay stabilizer: Almost all sedimentary sandstones contain a certain amount of clay minerals. Common clay minerals are montmorillonite, kaolinite, illite, chlorite, illite mixed layer and montmorillonite mixed layer. When they are in contact with external fluids that are not compatible, they can all undergo hydration expansion or scattered migration, block the oil gas flow channel, greatly reduce the permeability of the oil and gas layer, and even block the oil and gas layer in severe cases. Adding clay stabilizers to completion fluids and workover fluids to prevent the hydration, expansion and dispersion of clay minerals can avoid or greatly reduce the damage of the oil and gas layer during the operation. Clay stabilizers usually use CPAM, Shandong Ruihai Mishan has a variety of commonly used models.