The Selection Criteria For Drilling Fluids

IRO oildrilling

The most important criterion when designing for drilling fluid program is the minimum cost for the overall well. Other aspects to be considered in drilling fluids chemicals suppliers include issues related to exploration and production and environmental impacts, performance, and logistics. The drilling fluid program is developed according to many factors; these factors are discussed below:

Ecological Effect

When planning and implementing drilling fluid environmental concerns are still a major consideration. In offshore operations such as, for instance mineral oil or synthetic systems are preferable to diesel oil-based systems.

2-Drilling can be classified into two kinds: exploratory and development operations. When developing drilling the geological environment is well-known, which helps to design effectively the oilfield chemical suppliers program and optimize the other programs which are associated with it such as hydraulic design. The information available about the area is not enough to create the mud's properties. The mud system designed been designed to help in getting the geological information quickly and securely. In the event of any sudden problems or changes the mud composition should be able to adapt rapidly.

Problems related to the formation types

When drilling with bentonite through anhydritic formation, the released calcium ions into the mud system can hinder the hydration process for bentonite, which could affect the mud's viscosity as well as the loss of fluid. There are two solutions to deal with the presence of ions. They can be eliminated of the mud system by adding sodium carbonate (Na2Co3) or changing the IRO oildrilling into an inhibitory system.

High Temperature Environment

High temperature drilling can reduce the effectiveness of chemical additives and cause fluid loss and viscosity changes. These fluids can be resistant to extreme temperatures and can be used in mud systems based on oil.

The formation of pressure

Fluids can get into the mud system when drilling through formations that are high pressure. This can result in dirt contamination and unwanted kicks. To prevent such issues it is essential to calculate the right mud weight.

Loss Flow Intervals

Drilling fluids could be lost into the formation. This problem can classified as partial loss circulation or total loss circulation. The rate of flow from the outlet to the hole is less than the inlet flowrate. In the second scenario, no mud return is happening at the surface. If the fracture pressure is too high when drilling fluids circulate or the formation naturally breaks in order to allow mud to move through it, loss of circulation can occur.

Shale

There are many issues that can arise when drilling through shale intervals, it is possible to list them as follows:

Pipe sticking

Drag and high torque

-Hole cleansing difficulties

-Drilling liquid poisoning

Drilling Rig

The selection of the drilling fluids may be restricted by the mud control system (solid control system and chemical treatment) and the hydraulic horse power within the circulating system. Attaining the goals set is directly related to the rig selection and its layout.

Casing Program

Casing setting depth is planned by a number of variables such as changes in pore pressure trend, lithology and isolation of troublesome zones. These requirements are also used in the design of the drilling fluid program. Optimizing the drilling fluid program can enable drilling in deeper sections that reduces overall cost of drilling.

Water Requirements

In the process of designing a mud program, it is important to take into consideration the availability of drilling fluid. If the water used to make the drilling fluid is on site, diluting is the most economical treatment. The optimization of the solid control process will be the best choice in cases where the water must be shipped to the rig.

Corrosion

Combining corrosion with mechanical cyclic load can cause the drilling string to break. The dissolved gases, like Co2 and H2S in drilling fluids reduce the life span of the drill pipe dramatically.

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