oil drilling

Generally a solids control system will have all the 4 stages separation equipment for drilling cuttings and fluids. However, not all the equipment would have to be used when drilling. Hence, it will be better to design an overflow line for the drilling fluids on the mud tank to let the drilling fluids could flow bypass the equipment will not be used in some specific process.
In generally condition, the overflow line is designed as a U type slot on one side of the mud tank top. It is starting from the sand trap compartment of the mud tank to at least the suction tank where the high pressure mud pump could suck the active drilling fluids and transfer to the rig. As per customers’ requirements, this overflow line could extend to the drilling fluids mixing tank and storage tank.

drilling mud recycling system

solids control system on site layout

Shale shaker, de-sander, de-silter and decanter centrifuge are seen as the 4 stages of solids control equipment which can finally separate out the cuttings with size down to 2-5 microns. In some solids control system, there will also have vacuum degasser located between the shale shaker and cyclone units. This degasser is used to remove the entrapped gas in the drilling fluids like CO2. However, this degasser unit is not used very often.
When the time no need start this machine, we can close the gate on the overflow line to the degasser sucking compartment, and then the drilling fluids could flow directly to the de-sander compartment after treated by the shale shaker. Even, sometimes then no need the cyclone unit, the drilling fluids could flow into the centrifuge feeding compartment. This always happens at the beginning time of the drilling as there is not much cuttings in the drilling fluids.
By opening or closing the gate between the overflow line and each compartment of the mud tank. The mud engineer could guide the drilling fluids flow so than do a better control of the solids control system. You know, turn off the equipment will not be used temporally will save a lot when drilling, and that is also a protection on the machine.
Knowing how the overflow line works would be much helpful for us to design the drilling fluids solids control system. Once the system arrives at the drilling site, this could greatly help to increase the working efficiency.

In last article, we gave a brief introduction on how GN layouts the mud suction and mixing pipeline in the mud circulation system. On the mud tank, there are also other functional pipelines that would be designed and laid properly for complete the mud circulation system utility and enhance the working efficiency. Today we would like to gave a explanation on how GN engineer team design the mud gun pipeline and cleaner water line.

GN Drilling Mud Gun

GN Mud Gun with 3 Nozzles

What are the Functions of the mud gun line and clean water line

It is well known that in the mud tank, the mud agitator would be installed to agitating the drilling mud to prevent the solids particle sedimentation down to bottom of the mud tank, thus the drilling mud would be transferred or flow to next stage process as the suspension form. That would be benefit for subsequent equipment to work on the drilling mud. Mud agitator is high efficiency device. However, the mud agitator still can not get to the dead corner of the tank inner. For the issue, the solids control engineer always use the mud gun to solve the problem, the mud gun would be injected with drilling mud, high pressure mud out from the mud gun nipple would be jetted to the mud tank corner, by adjusting the angle of the mud gun, almost all the corner would be reached. During the mud recycling operation, the spraying mud would defile the equipment and lead to low efficiency. Moreover, the drilling mud would loss when separating. The mud engineer would have to add water into the mud tank to mix new drilling mud. The laying of the clean water pipeline would be necessary for these purpose, it should be very easy for the engineer to get the water.

How GN design the mud gun line and clean water line

GN’s mud tank are always rectangular, the top of the tank structure is applying the 4” tube steel. GN’s engineer would used this tube steel as the channel of the drilling mud and clean water. Only the seamless steel tube would be chosen in case of leakage of the liquid under high pressure. The mud gun line would be laid on every mud tank in the mud system so that the mud could be transferred to every mud tank compartment. Always, the mud gun line would occupy 1 length and 1 width of the tank top structure steel tube, between different tanks, the mud gun line would be connected by hose. To avoid confusion, the mud gun line would be laid at same side of the mud tank, while the clean water line is chosen as the counter sides.
The mud gun is installed inside the mud tank, thus the opening of the mud gun line would be inner the tank for easy connecting with mud gun terminals. While, the clean water line has several opening on mud tank top surface, the mud engineer would connect the water line by using a tap and control by a valve.

Regarding the power, the mud gun line is connecting with the mixing pump or high pressure mud tank. The clean water would be pumped into the water line with sufficient power. GN’s design on the mud gun line and clean water save cost on additional pipeline and effectively use the mud tank existing structure.