Most offshore drilling equipment has more strict requirement to equipment quality, no matter the rig machine or solids control equipment. The manufacture need to make them with higher grade standard. As usually API standard was acceptable by most countries of the world. Offshore drilling equipment require most times will require DNV lifting , higher explosion proof standard and also the anti corrosive coating since the ocean environment has high corrosive to equipment. GN solids control has more than 15 years .We exported to more than 75 countries and provide equipment to many top oil gas industry in the global, and built long term cooperate relationship with them.
High G shale shaker
Last week we delivered several sets cutting drying high G shale shaker to offshore drilling platform. These shaker are specially designed for offshore drilling waste management application. This high G shaker was used to treat drilling cutting. The vibration G force can more than 8 G, and the normal shaker is 7.5 G. This shaker can recycle partial drilling mud from drilling cutting and dryer cutting to convenient transporation. It is helpful to reduce transport cost and for the further process. As we all know drilling mud is high solution ,even the drying drilling cutting to be treatment by profession device to reduce pollution.
High G shale shaker
From the photos we can see, this high G shaker equipped a vacuum device to generate a negative pressure to suck the liquid from solids cutting and recovery them. This design makes our high G shaker very popular in the market, and client use them to recycle drilling mud. BTW, we also designed the anti splash device to cover the shaker to meet the offshore platform requirement about clean. All these was designed by GN own.
GN can provide a entire series solids control equipment and wast management equipment for drilling industry. We are good at customized build system according to client requirement. Such as mud system, drilling cutting treatment system. If your project have demanded on these equipment, welcome to contact us.
The drilling well site must be equipped with at least one vibrating screen. The purpose of shale shaker and other solid removal equipment is the same, which is to reduce the drilling cost. Drilling fluid always require the particle size and content in drilling fluid. Shale shaker can remove out the big size solids contend in the drilling fluids backed from well. If there solids can not be removed timely, which may cause lots problems in drilling.
Consider whether to use a coarse mesh screen. When a large amount of drilling cuttings or clay returns to the wellhead, it is necessary to use a coarse mesh screen. Generally speaking, when the drilling fluid flow rate exceeds 1000gal / min in a 17 in diameter open hole, it is required to use a coarse mesh screen before using a fine mesh shale shaker. Finally, the number and type of main shale shakers used to treat all drilling fluids should be selected. The selection goal is to let the non weighted drilling fluid pass through the most detailed screen cloth as much as possible. For weighted drilling fluid, the use goal of shale shaker is to make all drilling fluid pass through API 200 mesh screen cloth (too fine screen cloth will remove more weighting agent).
The selection of screen cloth. it is said that some professional software can be used to select the mesh number of vibrating screen cloth. However, the data used in these software are basically obtained from the cobalt well fluid prepared in the laboratory, so they have some limitations. Any drilling fluid treatment agent formula may reduce the treatment capacity of the shale shaker system. For example, cobalt well fluid containing starch is difficult to screen, because starch, as a good filtrate reducer, tends to “paste” the fine screen holes. The drilling fluid with high static shear force is also difficult to pass through the fine screen. Therefore, the vibrating screen cloth that should be used to deal with a certain fluid flow rate is not introduced here. The selection of screen cloth for various drilling fluid shale shakers is mainly determined by repeated test method. It is best to contact the manufacturer and ask for suggestions on the selection of screen cloth in this area.
Shale shaker is a conventional equipment used to separate solid phase from circulating drilling fluid. There are many shapes and types of shale shakers. Commonly used are
cobalt well fluid flows along the center on a square or rectangular screen cloth.
drilling fluid flows along the center on a rotating, non vibrating cylindrical screen cloth
drilling fluid flows from the center to all around on a circular screen cloth.
Although vibrating screens of other shapes have been in trial use, they have not been commercialized. Most vibrating screens adopt rectangular screen cloth. Large solid particles are removed at the bottom of the vibration. Small solid particles and drilling fluid flow through the screen surface and re-enter the circulation system. The solid in the drilling fluid greater than 74um is unfavorable to the performance of the drilling fluid. Api200 mesh (74um) vibrating screen is formulated on this basis. Only 3% of the weighting materials that meet the API classification standards have a particle size greater than 74um. The screen mesh is larger than 74um. Under this size, most barite will be removed from the drilling fluid, which will seriously affect the performance of the drilling fluid and the drilling cost. Vibrating screen is the most important and earliest equipment used for solid phase removal, which plays a very important role in solid control system. It is the first line of defense after the drilling fluid returns to the surface from the wellbore, which generally has a great impact on the cost. However, if the damaged screen cloth is used, the cobalt well fluid does not pass through the screen cloth, and the mesh number of the screen cloth is improperly selected or partially damaged, the next solid control system will not operate normally. Shale shaker is suitable for any type of drilling fluid. The selection of screen cloth is determined by circulation speed, shale shaker structure, borehole properties, drilling fluid performance and other factors. Many properties of drilling fluid show the processing capacity of screen cloth.
GN solids control has been in shale shaker manufacture for more than 15 years, we can provide different type shaker according to client requirement. If you have demanded , welcome to contact us.
During the drilling process, the density of drilling fluid will be reduced and increase the viscosity after being invaded by natural gas or air. The decrease of drilling fluid density leads to the decrease of hydrostatic column pressure, which may lead to blowout, well collapse and other malignant accidents. Therefore, the gas invasion drilling fluid is very dangerous, and measures must be taken to deal with it correctly.
After drilling to the natural gas reservoir, the gas probably invade the drilling fluid, and we are sure the air will invade the drilling fluid during the working process of shale shaker, cyclone and mud agitator. The density of drilling fluid decreases obviously after gas invasion, but the influence on the hydrostatic column pressure in the well is much smaller than people think. The reason is that the invading gas is compressible and the density of drilling fluid will increases gradually with the depth of the well. In these two case, there are 2 different pressure gas. So It is dangerous to make a decision to use weighting method to make up for the density reduction only based on the reduction of drilling fluid density that has been invaded by gas, which may lead to the excessive density of drilling fluid , fracturing the formation and polluting the production formation. It will reduce the ROP, cause leakage and lead to the decrease of liquid level in the well, and then blowout.
In order to restore the density of drilling fluid, the most effective means is to use degasser. GN solids control can provide two degasser. The normal poorboy degasser and vacuum degasser. First kind is installed before shaker. Received the drilling mud from well, and vacuum degasser installed between mud cleaner. They utilized different principle, first kind through increase touch area when mud drop on the bottom of tank, brake the bubble involved in mud and move out gas. The vacuum degasser through generate a negative pressure space to make the gas out of mud. Both kind degasser will be need in one full mud system. If you have demand, welcome to contact us.