mud agitator drilling free sample

The present invention relates generally to the field of drilling mud systems and, more particularly, to a drilling mud agitator assembly including a shaft retainer that permits disassembly of the agitator shaft from outside the agitator tank.

The present invention relates to a device for agitating drilling mud having particulate solids entrained therein, such as for example drill cuttings and various drilling mud additives. In operation, such a device is typically mounted atop a mud tank in which one or a plurality of agitating devices may extend.

As described in U.S. Pat. No. 4,516,860 to van der Laan et al., drilling mud is commonly used in oil and gas drilling operations to cool and lubricate the drill bit and flush drill cuttings from the bore hole back up to the surface. Drilling mud must have an adequately high specific weight so that the column of drilling mud controls the liquids and/or gases in the formation on the corresponding depth without danger of blow outs. Further, viscosity of the drilling mud should be higher than that of water, so that the drill cuttings can be entrained in the rising flow of drilling mud in the annulus around the drill pipe. At the surface, the drill cuttings are removed from the drilling mud in a several-step operation. In one step in this operation, it is essential to agitate the drilling mud to keep the drill cuttings from separating out of suspension in the drilling which would clog up the operation.

For this step, drilling systems commonly include a mud tank provided with an agitator. The agitator typically comprises a motor mounted on a mounting plate on top of the mud tank. A shaft is coupled to the motor and extends down through the mounting plate into the mud tank to a level sufficient to be immersed in the mud/drill cuttings suspension. An impeller is mounted to the end of the shaft so that by rotating the impeller, the mud is agitated and the drill cuttings are prevented from settling out.

The agitator system shown and described in U.S. Pat. No. 5,944,418 to Orr et al. illustrates one structure of the coupling of the motor, shaft, and impeller. In that system, a motor is mounted on the top of a cover. Various types of motors might be employed, such as an electric motor. Extending from the motor is an agitator shaft which passes through the cover and is rotated by the motor. The agitator shaft lies generally along the axis of the cylindrical tank. Extending radially outward from the agitator shaft is a plurality of impeller blades.

Orr et al. purport to keep the drilling mud the drill cuttings in good mixture without any problems, and without the high viscosity and the high specific weight of the drilling mud, and the high weight of the for instance heavy clay and/or rock particles of the drill cuttings could cause a separation of the drill cuttings and the drilling mud.

A difficulty arises when maintenance must be performed on the system within the mud tank or repair or replacement of the agitator motor. The typical system, as shown in described in Orr et al., requires access into the mud tank if maintenance is to be performed on the agitator. This requires draining the mud from the mud tank and then permitting a workman to enter the mud tank to perform the required operation. Or, if the agitator motor is to be repaired or replacement, access must be made into the mud tank to de-couple the impeller blades from the end of the shaft so that the shaft can be withdrawn through the cover. This is not only time consuming, it places the workman in danger.

The present invention addresses these and other needs in the art by providing a mechanism for securing the agitator motor on top of the man-way cover for the mud tank. The mechanism includes a retractable shaft retainer arranged to engage a retainer block affixed to the agitator shaft. A pair of hemi-cylindrical coupling halves couple the agitator motor shaft to the agitator shaft.

The retractable shaft retainer, once engaged with the retain block, secures the agitator shaft. The coupling halves can then be quickly and easily removed, and the motor can then be removed for repair or replacement.

FIG. 2 is a detail perspective view of the agitator of FIG. 1, with the shaft retainer withdrawn so that the agitator system is free to operate normally.

FIGS. 1, 2, and 3 depict an agitator system 10 in accordance with the teachings of the present invention. The system primarily comprises a gearbox/motor assembly 12, an impeller 14, both coupled together with an agitator shaft 16. The gearbox/motor assembly 12 is mounted on an open work pedestal 18 which is affixed to a cover plate 20. The cover plate is secured to the top of a mud tank 22, which is shown in FIG. 1 as having flat rectangular sides for illustration purposes only. Preferably, the mud tank 22 is a cylindrical tank with a round bottom so that the tank does not present any dead zones for the free flow of agitated mud within the tank. The cover plate 20 is preferably removably mounted to the top of the tank 22 with a set of screws 24, for example.

The gearbox/motor assembly 12 is preferably secured to the agitator shaft 16 with a shaft coupling 26, shown more clearly in FIGS. 2 and 3. The agitator shaft 16 extends through a hole 28 in the cover plate 20. Thus, without the present invention, decoupling the gearbox/motor assembly 12 from the agitator shaft 16 by removing the coupling would result in the agitator shaft falling through the hole 28 into the tank. To alleviate this problem, a shaft retainer comprising a first retainer half 30 and a second retainer half 32, are operationally mounted onto the cover plate 20. Each of the first and second retainer halves comprises a substantially semi-circular element with an upwardly depending notch 34 formed therein to mate with a retainer block 36. The retainer block 36 is affixed to the agitator shaft 16 such as for example by welding, or it may be otherwise secured to the shaft 16.

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It also contains a small amount of water droplets, helping in the cleaning of debris. Such is that the agitator does not absorb water droplets, helping in the cleaning of impurities. It is quickly clean and efficient, it is also called the drilling mud agitator which has a low amount of water droplets, helping in the cleaning of fine dust. There is also a large amount of water droplets, helping the elimination of impurities from semi-truck mines. It is also known to be a highly effective product of water droplets, helping in the cleaning of impurities.

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Mud agitators are fluid mixing equipment that keeps solids in drilling fluid suspending, no deposit in the mud tank bottom. It uses its impeller to agitate and mix the drilling mud to prevent solid particles from depositing in the tank or mud pit.

There were many types of mud agitator, depending on purpose demand, gearbox type, and working conditions. But the basic structure of the mud agitator is all the same: Motor, gearbox [Speed reducer], shaft, and impeller.

Yes. Some clients prefer the hydraulic drive for some specific use. Some clients need a vertical agitator. And some clients prefer the stainless steel shaft and impeller. Different applications and industries will request equipment much different If you have questions or demand on mud mixers, please let us know and we’ll help you to get the ideal solution.

For oil and gas drilling, there are different configurations on tanks number, tanks size, so it’s not easy to confirm. But we can take a system as an example. One mud system laying with 6 tanks, and tanks size are 9 m X 2.2 m X 2.3 m. The normal proposal is 3 sets of agitator per tank. But there is a shaker tank, then we deduct 1 set. So, probably we need 17 sets of the agitator. And the agitators are APM 7.5 driven by 7.5 kw motor.

The most important factor was the power of the mud agitator, 5.5 Kw agitator is cost far lower than 22 KW. There is apparently a different price between the explosion-proof type and Non-proof type. Higher explosion-proof grade means higher cost.

Worm gearbox type mud agitator is a common type, durable, and easy maintenance. But its efficiency lower than the bevel gearbox. so bevel gearboxes are generally more expensive than worm gearboxes for the same HP and gear ratios. Helical-worm and helical-bevel are advanced generation type of worm and bevel gearbox. They produce less vibration and noise. The planetary gearbox is mainly used in vertical agitator.

For the PSV´s carrying drilling mud to the oil platforms it is important to keep the mud homogeneous, otherwise there will be severe sedimentation. The drilling mud is expensive itself and a delay in time, waiting for the drilling mud to be mixed is even more expensive.

Hassle free operation and ease of maintenance of the agitator is an important factor in the operators ability to supply the platforms without costly delays.

mud tanks are important rig components that are used for storing mud for oil and gas drilling operation. We will discuss about mud tanks miscellaneous components .

Used to shear/mix   mud in the mud tank it is usually installed near toCorner of mixing tank.  It enhance agitation of mud, Where agitation byagitator is limited, as agitator  is installed in the middle of tank.It can be used to transfer mud between the mud tanks.