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Drilling fluid is a chemical agent that plays an important role in the process of oil and gas exploration and production. Drilling fluid, also known as drilling mud, is a special liquid used in the drilling process, mainly composed of water, clay, additives and other auxiliary materials. It is injected into the drilling hole from the well head through the drilling equipment to cool the drill bit, reduce the collapse of the well wall, control the formation pressure, transport rock debris and so on.
However, drilling fluids are often subjected to corrosion and corrosive dirt during transportation, storage and use, which affects their quality and effectiveness. Corrosion inhibitors are often added to reduce corrosion and fouling problems in drilling fluids. Adding corrosion inhibitors is an important measure to protect drilling fluids, reducing corrosion and fouling problems and improving drilling efficiency and equipment life.
The main functions of corrosion inhibitors for drilling fluids include:
Protecting borehole equipment: Metal components in drilling fluid, such as drill bits and casing, are the most vulnerable to corrosion during drilling. Adding corrosion inhibitors can extend the service life of equipment and reduce repair and replacement costs.
Keep the performance of drilling fluid stable: Adding corrosion inhibitors can prevent metal ions generated after the corrosion of metal parts in drilling fluid from further affecting the performance stability of drilling fluid.
Protect the environment: During drilling, drilling fluid may leak, causing pollution and harm to the environment. Adding corrosion inhibitors can reduce the environmental impact.
Corrosion inhibitors can be divided into organic corrosion inhibitors and inorganic corrosion inhibitors according to their different chemical properties and mechanism of action. Common organic corrosion inhibitors include corrosion inhibitors, corrosion inhibitors and chelating agents. Inorganic corrosion inhibitors include oxidants, reducing agents and alkaline substances.
When selecting a corrosion inhibitor, factors need to be considered: the nature and composition of drilling fluid; Chemical properties and mechanism of corrosion inhibitors; Stability and scope of application of corrosion inhibitors; Safety for the environment and operators.
The method of using drilling fluid corrosion inhibitor includes the following steps:
The first step, the selection of drilling fluid corrosion inhibitor: according to the specific oilfield environment and geological conditions, select the appropriate drilling fluid corrosion inhibitor. In the selection, it is necessary to consider the corrosion media, temperature, acid and alkaline factors that may exist in the drilling fluid.
The second step, add to the drilling fluid: Add the corrosion inhibitor to the drilling fluid according to a certain proportion, and fully mix. This can be done by mixing tanks or drilling fluid mixing equipment.
The third step, adjust the concentration: according to the specific working conditions, the concentration of corrosion inhibitor can be appropriately adjusted. In general, the concentration is between 50-200 PPM.
The fourth step, inspection and monitoring: after the use of corrosion inhibitors, it is necessary to carry out regular inspection of pipelines and equipment, including checking the corrosion of drilling fluids and pipeline corrosion. It can be monitored by sampling and laboratory tests.
It should be noted that the use of drilling fluid corrosion inhibitors should be in accordance with the recommendations in the instruction manual, and comply with the corresponding safety specifications and requirements. In the process of use, foreign matter and dirt should be removed in time to maintain the good operating state of the corrosion inhibitor to ensure the quality and effect of the drilling fluid.