drilling rig

What is Geothermal drilling

Geothermal drilling is used for geothermal steam and hot water well drilling. It is a special technology and necessary method for the exploration, exploitation of geothermal fluid.

For the high temperature geothermal drilling, drilling depth is generally 500 meters to 2000 meters, a little more than 2000 meters, mostly in 600 ~ 900 meters. Regariding to the conduction type geothermal field at low temperature, the average depth is 1800 meters, while the geopressured geothermal drilling can reach to 6000 meters depth.

Features of mud recycling system for Geothermal drilling

1) As the temperature of Geothermal drilling is normally higher. There should be mud cooler before mud recycling system and after mud comes out from well head.

2) There should be galvanized grating to cover the tank tops for a better heat-radiation. Checkered plate is not recommended for Geothermal drilling mud recycling system. The heat cannot come out well in this condition.

3) Normally, there is only desander cone in the mud recyclone system. Desilter cone is not used.

4) As the mud temperature is higher, PU hydraocyclone is not suitable for Geothermal drilling mud recycling system, while cast iron cyclones should be used.

5) And in some cases, geothermal drilling rig platform is low, it means the flow height from drilling rig to shale shaker is lower. It gives strict limitation on shaker tank design.

GN Solids Control got an inquire from a European Geothermal drilling company. They are searching for a mud recycling system for their 750hp Geothermal drilling, and they want a 3-tank mud system.

After communication, we know that their flow height is only 2.6m. Per their condition, we offer tech. proposal together with commercial proposal, customer satisfy and give us order soon. And the system will be dispatch to jobsite soon.

Below is the system proposal we offered for the 750hp Geothermal drilling rig.

1) Shaker tank #1: 6012×2200×1600mm

2) Mixing tank 2# and Storage tank 3#: 11500×2200×2350mm

3) Shale shaker linear motion

4) Desander separate

5) Mixing system and mud agitators

General description of Hydraucyclone desander desitler

Hydraucyclone is a normal parts used for mining industry, for drilling field, for waste water separation, soil depuration. In drilling field. Hydraucyclone can be used as desander desilter per different size. Or combined with shale shaker to work as mud cleaner. 

Big size desander cone normally used for mining, piling or CBM drilling.  Hydraucyclone for desander desilter in drilling fieldi usually small size:

1) Hydraucyclone for desander: 12inch, 10inch

2) Hydraucyclone for desilter: 5inch, 4inch

Main parts of Hydraucyclone for desander desitler. Take example of 4 inch desilter cone, it is components of below parts:

1) Shell

2) Cone tube

3) Drop in Apex

4) Orifice nut

When combined for a desilter machine, elbows and clamps, ball valves will be used for connection.

Principle of Hydraucyclone for desander desitler

Hydrocyclone is a cylindrical part of the conical vessel. The upper part of the internal cone section called the liquid cavity. Cone outside is provided with a liquid inlet pipe, and the liquid cavity is communicated to the tangential direction. The top of the container is the overflow port, the bottom is underflow (also called the discharging port). Cyclone size is determined by the maximum diameter of the cone. Its working principle is centrifugal sedimentation. Because of the coarse particles and fine particle size difference exists (or density difference), the centrifugal force, under the centripetal buoyancy, drag force of different sizes, due to the centrifugal sedimentation, pyramidal intermediate creates a low pressure area, forming a column of air, caused by vacuum suction effect, play, most of the fine particles in the cyclone under the actions of upper discharged from the overflow tube, heavy particles thrown to the wall of the barrel, slide along the barrel wall, from bottom outlet.

Materials ofd Hydraucyclone for desander desitler

Polyurethane is also called polyurethane formate, is a kind of polymer between the plastic and the rubber polymer materials. It has not only high strength plastic, and has the high elasticity of rubber. It is a new type of wear resistant material, an excellent comprehensive performance. It has many excellent performance, high wear resistance, in the synthetic material of the first, even more than some alloy steels. The polyurethane as hydrocyclone lining, its service life is four times of high chromium cast iron, four times eight times Ding hydrogen rubber, natural rubber. Polyurethane shore hardness in the range of 17~97 to 85~90, the best wear resistance.

Inside a solids control system, desander may be the second stage equipment, which removes solids particle size 40-100 nm from drilling liquids. Then your next is desilter getting rid of particle size 16-50nm from drilling liquids. While, cone(also called hydrocyclone) may be the functioning part for desander and desilter. Based on the size cone diameter, cones are called desander cones having a the diameter over 6’’ so that as desilter cones having a diameter under 6’’. Generally, 8’’ and 10’’ cones are generally utilized as desanders 4’’ and 5’’ cones are often utilized as desilters.

You might be interested in the way a cones works. GN Solids America will tell you the answer within the following paragraph.

In normal operation, feed slurry needs tangentially in to the interior from the cone inside a high-speed, leading to whirlpool effects within the cone. The swirling motion from the slurry drives the bigger and denser contaminants outward from the cone wall for the lower discharge port, as the more compact, lighter contaminants move towards the middle of the cone and venture out with the upper discharge port. The separation of solids from drilling liquids is completed.

GN’s desander and desilter cones are constructed with memory material, and switches into a detachable set up to become placed on a shale shaker.

As quickly as the drilling site has been chosen, scientists survey the region to figure out its boundaries, and conduct environmental effect studies if essential .Drilling firm may perhaps require lease agreements, titles and right-of way accesses before drilling the land. For off-shore sites, legal jurisdiction has to be determined.

Right after the legal challenges are solved, the crew goes about preparing the land:
1. The land have to be cleared and leveled, and access roads might be constructed.
2. Simply because water is utilized in drilling, there should be a supply of water nearby. If there isn’t any all-natural supply, the crew drills a water properly.

For drilling fluids and cutting disposal .The group digs a reserve pit, which can be applied to dispose of rock cuttings and drilling mud during the Drilling Mud System, and lines it with plastic to shield the environment. If the web page is an ecologically sensitive region, for example a marsh or wilderness, then the cuttings and mud must be disposed of offsite – trucked away instead of placed within a pit.
For that reason, deciding on a appropriate solids handle system is essential for the job web-site to prevent polluting the atmosphere. Firstly, we will need know how several shale shaker might be applied for the job internet site and relative mud cleaner (http://www.gnsolidsamerica.com/mud-cleaner.html) for separating the fine particle. Secondly, the solids and cutting from shale shaker and mud cleaner are transferred by GN screw conveyer (auger) to the site for truck to delivery offsite or do additional course of action. Thirdly, GN decanter centrifuge is focused on separating the fine particle beneath 20 microns, which sustain the drilling fluids weight and retain drilling fluids clean. Finally, the drilling cuttings from shaker and drilling mud system still include fluids, which contaminate the soil if they’re directly buried. Consequently, GN-Solids-America vertical USA cutting dryer can dry drilling cutting to reduce the contamination and reclaim the drilling fluids.

All in all, deciding on a fantastic solids control technique is an critical portion for drilling. You could seek advice from with GN for solids handle unit.

What is dewatering unit
Dewatering unit is a mixing system to mixing chemicals and drilling mud for floculation. After floculation, the very find solids will be formed into bigger size, and suitable for decanter centrifuge treatment.
For easy understanding, we can see that, it is similar like put orange juice into a cup of milk.  It is milk whilte originally, after mixed with juice, immediately, the milk is separated into floccus and pure-like water.

Sizes of dewatering unit
Dewatering unit is noramally put into container, there are 20ft containerized and 40ft containerized. Per different customers request, there are different design for the dewatering unit itself. There are 2-chamber dewatering unit and 3-chamberdewatering unit. And per defferent request, it can mixing chemicals from 1 ~ 3 kinds.

Dewatering cantrifuge for dewatering unit
Decanter centrifuge is normally used in dewatering unit. Per the jobsite footprint, the decanter centrifuge have 3 kinds of connections with dewatering unit:
1) The decantering centrifuge can put into container, connected with dewatering unit
2) The decantering centrifuge can put on the top of container, connected to dewatering unit
3) The decantering centrifuge can put outside container, connected with dewatering unit

How to order a suitable side dewatering unit?

If you want customized dewatering unit, you’d better try to answer below questions:
1) 2 chambers or 3 chambers request: 3 chamber is more widely used. 2 Chamber cannot continue mixing.
2) The chemical preparing speed (Liters/Hr): 1500liters/hr is a normal speed, customer can request customized mixing speed
3) Density of chemicals, in order to make sure the hopper size
4) Chamber capacity (if there is)
5) Other special request (if there is)