mud recycling system

The business of today’s GN has been divided mainly into 2 scopes, one is the normal drilling mud recycling, and the other is the waste management including the waste coming from petroleum related and other separation industries. This blog is mainly talking on the drilling mud recycling system that used in non oil drilling industry.
In oil drilling, the drilling depth and safety regulation request large drilling mud storage and more solids control equipment. Thus, the mud recycling system is always equipped with degasser unit and large volume mud tanks.

hdd-mud-recycling-system

HDD Mud Recycling System

Comparing with the mud recycling for oil industry, the unit for non oil drilling is more compact and less equipment needed.

  • Trenchless/No Dig HDD project – The mud recycling system used in this type drilling is matching with a No dig rig. In some project for long distance pipeline and cables laying underground, it is inconvenient to dig an open groove on the ground as that will interrupt the normal traffic. The trenchless is an ideal choice. The mud recycling system for this project is always consisting of 3 stages separation as shale shaker unit, de-sanding and de-silting cyclone.
  • Piling is the main method to install the bridge supporting pillar. A de-sanding unit with a small tank would be enough to remove out the coarse solids from the drilling fluids. The de-sanding unit is a composition of de-sander cyclone and shaker unit that can separate out the solids with size of 40-70 microns. Piling does not request very clean mud; less equipment involved makes the recycling unit for piling is very compact.
  • GN also can manufacture the mud recycling system for tunneling project. For micron tunneling, GN has model available with capacity of 120m3/h, 240m3/h and 500m3/h. For large flow rate request, GN has the mud plant GNMS -3600M with treating capacity of 3600m3/H.
tbm-slurry-separation-plant

Tunneling Mud De-sanding Plant

Besides, GN’s mud recycling system can also be used in water well drilling, coal bed methane exploration, dredge slurry separation and the mining flushing waster cleaning process.

Last week, GN’s manufacturing department finished the fabrication of a mud mixing tank with double hoppers. Mud mixing tank is widely used in the drilling mud recycling system for mixing and re-configuration the drilling fluids. Also sometimes it will be used for storage the active drilling fluids.

mud-mixing-tank-with-double-hopper

mud mixing tank system

A mud mixing system is always consisting of mixing tank, agitators, mud guns, mixing pump and mud hoppers. Generally, the mixing pump and the mud hopper will be located at one end of the mud tank to make the mixing tank system a compact and single unit, while in some projects, the mixing pump and hopper are installed on a separate skid so that the mixing tank and the jet mud mixer could be used much freely. The picture in this article shows that the jet mud mixer skid was located at one side of the mixing tank. There are one mixing pump and 2 mud
hoppers on the skid. The mixing pump is connected with both hoppers, one of the hoppers is used for mixing barite to make weighted drilling fluids, and the other one is used for adding bentonite into the drilling fluids.
There is a steel frame around second hopper with steel bars over the hopper. This horizontal steel bar is used to hang the bentonite bag which will be hooked at 4 corners of the steel frame to make it easier for adding the bentonite powder into the hopper. It is worthy to mention that the steel bar is with forklift lifting slot so that the bar with bentonite bags could be lift and put on the frame by a forklift to save human power.
This mud mixing system is with a control panel to control mixing pump which could transfer mud to both hoppers. On the mixing tank, there is another charge pump which is used to transfer the active mud back to the rig for reuse.

All large capacity drilling projects such as oil gas drilling, no dig drilling for pipeline laying and water well drilling need drilling fluids when doing the drilling job. There is one type equipment naming shear pump that is an ideal choice for drilling fluids mixing. We could see the drilling fluids as the blood of the drilling equipment.

GN high efficiency shear pump polymer cutting

GN Shearing Pump in Mud System

Here, how to make the drilling blood clean and let the blood perform well is so important to all the drillers. It is known that the drilling project need a drilling fluids recycling system, or we call it mud recycling system. Before start drilling, we need get the mud recycling system ready. On the other hand, we need the drilling fluids to be ready. The drilling fluid is a mixture of water/oil and some mud materials like barite, bentonite, and some other chemical agents. Among the various mud materials, the bentonite is the most important one and the consumption is quite big. Meanwhile, the bentonite is also a polymer which is difficult to solve into the drilling mud base.

Then how should we resolve this problem? Bingo! We need a shear pump. Thanks to the special design of the impeller, the shear pump could cut the polymer into very small pieces so that these materials could solve into the water easily. A high efficiency shear pump could make the consumption of bentonite reduce 30%. Oh my god! Really a large cost saving.

This is not the only advantage to use a shear pump to cut the polymers. Once the drilling started, the solids control equipment will also start running. When the used drilling fluid comes out from the well whole and flow into the shale shaker, the mud recycling process is beginning. If there is much long strips material in the drilling fluids, the screen will be blocked which leads to loss of polymers.
One thing the drilling fluids engineers need pay attention is the shear pump cannot run without fluids inside the pump. As you know, the shear pump is use centrifugal type pump, it need run with liquid to reduce centrifugal force so that the fluids can be transferred continuously. One more, the shear pump cannot be used to transfer used/active mud, as the cuttings in the used mud will definitely damage the pump parts.