Sodium carboxymethyl cellulose (CMC) in oil drilli

Sodium carboxymethyl cellulose (CMC) plays a role in reducing filtration and increasing viscosity in drilling fluid, cementing fluid and fracturing fluid, thereby protecting the wall, carrying cuttings, protecting the drill bit, preventing mud loss and increasing drilling speed.

CMC has the following important applications in oil drilling:

1. Drilling fluid

During the drilling process, CMC plays a key role as an important additive to drilling fluid.

1. Viscosity-increasing effect: It can increase the viscosity of the drilling fluid, so that the drilling fluid has a good ability to suspend and carry cuttings. Ensure that the cuttings can be smoothly carried from the bottom of the well to the ground, prevent the cuttings from accumulating at the bottom of the well, and thus maintain the smooth progress of drilling.

2. Filtration reduction effect: It can effectively reduce the filtration loss of the drilling fluid and reduce the penetration of the drilling fluid into the formation. This helps to maintain the stability of the performance of the drilling fluid, prevent the formation from being excessively contaminated and damaged by the drilling fluid, and also maintain the stability of the well wall and reduce the risk of well wall collapse.

2. Improved recovery

In the later stage of oil extraction, CMC also has certain applications in order to improve the recovery rate of crude oil.

1. As a component of oil displacement agent: it can be used in combination with other chemical agents to form an efficient oil displacement system. By improving the rheology and stability of the oil displacement agent, the oil displacement efficiency is improved, thereby increasing the output of crude oil.

2. Adjust the viscosity of the injected fluid: the viscosity of the injected fluid can be adjusted to match the viscosity of the crude oil, so as to better promote the flow of crude oil to the production well.

Note: CMC with high viscosity and high degree of substitution is suitable for mud with low density, and CMC with low viscosity and high degree of substitution is suitable for mud with high density. The selection of CMC should be determined according to different conditions such as mud type, region, and well depth.