Monthly Archives: March 2020

Analysis on Treatment Method of Oil Field Waste Drilling Fluid

With the continuous exploration of oil field reserves in China, the development strength of oil field has been obviously enhanced, and the number of oil wells is also increasing more and more rapidly. Because of the damage to the environment, the treatment technology of the waste produced during drilling has attracted more and more attention. Drilling fluid, as the main waste liquid to be treated in drilling process, has been widely used in pollution-free treatment technology of oil field waste drilling fluid because of the pollution and damage effect of some chemical components contained in it on the environment.

1 Recycling method

The waste drilling fluid can be reused after recovery, storage and treatment by transit station. This method not only avoids the damage of drilling fluid to the environment, but also effectively reduces the cost of drilling fluid in the process of reuse.

1.1 Mechanized recovery units are used to convert drilling fluid into dry-cured dry powder formulations and to reuse the cured dry powder formulations after hydration. Although the hydrated drilling fluids can not reach their original properties, their use as an aggravating agent is still very effective. This method uses more fuel and costs more in the process of curing the drilling fluid into dry powder formulations, which is also a disadvantage of this method.

1.2 Old well drilling fluid reuse technology: this technology is relatively simple, one well after the completion of the drilling fluid can be moved to another similar well to continue to use, then the drilling fluid only need to add some treatment agent to achieve the original performance for re-use. This method does not require mechanical equipment and fuel, the demand for personnel and equipment is low, the cost is low, and the pollution of drilling fluid to the environment is effectively reduced, so this technology has remarkable effect in terms of economic, environmental and engineering benefits. This method is most suitable for the area with high wellhead density. After the completion of the old well, the drilling fluid is transferred by transfer tank truck Using another field utilization, this method urgently needs to solve an urgent problem, that is, how to ensure the multiple reuse of drilling fluid with the minimum investment, which is the most promising and low cost method at present, effectively realizes the reduction of production cost and the improvement of economic benefit of oil wells.

To be continued

Characteristics and Advantages of Slurry Rapid Precipitator

According to the mud properties of different mine sand washing plants, the use of different mud rapid precipitator products can effectively ensure the recycling of cleaning, rapid precipitation speed, flocculation tight. Compared with the present treatment process of mud wastewater from sand washing yard, the separation of mud water and flocculation sedimentation purification by using mud rapid precipitator has great advantages, which is manifested in the following aspects:

  1. sewage treatment capacity is large: reduce the precipitation time of suspended matter, reduce the content of suspended matter in sewage and reduce the cost of sewage purification treatment, small area, low management costs. At present, the sedimentation tank sewage purification treatment system, which is widely used by mine sand washing field production enterprises, only depends on the gravity of fine particles for precipitation, its precipitation speed is slow and the precipitation time required is longer.
  2. addition amount is less: using this product with a very small amount can play a good flocculation sedimentation effect, rapid precipitation.
    3. removal rate is high: the mud sand branch removal rate is more than 95%, the water in the clear liquid tank can be returned directly to the sand washing system, and the real zero discharge can be achieved. This product can be used for piling, mining, sand washing yard and other mud precipitation treatment.
  3. Usage:
    1. the slurry rapid precipitator solid particles and tap water were stirred and dissolved into liquid state, which was directly added to the instantaneous precipitation in the mud wastewater of the sand washing field by the way of valve or metering pump. the dissolved concentration of the slurry rapid precipitator was generally 0.1%-0.2%.

2.for the uncertain sediment concentration in mud wastewater, the amount of addition should be determined by experiments.

3.for the treatment of different concentrations of sand washing wastewater, the amount of mud precipitator can be adjusted by field debugging.

Note: the amount of mud precipitator is determined with the concentration of sand washing sewage, if the amount of excessive, it will cause waste and will have a reaction, if the amount of mud precipitator is not enough, it will be difficult to produce precipitation, so the correct and reasonable control of the dosage, should first do a small test to determine the dosage in use.E

Application of Mud Precipitator

Mud precipitator is an organic polymer, which can quickly separate and precipitate all kinds of mud sewage and achieve the purpose of mud water separation. It is a good mud pressure mud dehydrator.

Mud precipitator, can be used for rapid precipitation of mud wastewater such as washing mud, sand washing mud, piling mud and so on. In the process of sand washing production in mine sand washing yard, a large amount of waste water, solid sediment and sludge will be produced. The main pollutants are a large number of sediment suspensions with different particle sizes. Generally, more than 2 sedimentation tanks are used to filter out larger suspended matter or particles.

Mechanism of sedimentation agent action: it is very practical and simple to make rapid flocculation sedimentation of mud wastewater adopt mud rapid sedimentation agent, mud rapid sedimentation agent also known as mud precipitator, mud sewage flocculant, in the sand washing mud wastewater treatment process due to different water quality, composition, need to choose the corresponding mud rapid sedimentation agent products, can quickly adsorb suspended matter in mud wastewater to form condensed particles, these flocs in the process of settling, will catch new mud particles, and become a tight structure of large flocs after collision.

Experimental selection: in order to speed up the sedimentation rate of mud waste water in mine, sand washing yard and other production processes, reduce the sedimentation time of sediment, reduce the content of suspended matter in sewage and reduce the cost of sewage treatment, the types, structure, molecular weight and ionic strength of mud precipitator, dehydration and peeling property of filter different. In practical production, in order to select the appropriate slurry rapid precipitator and its addition amount, the following methods are usually used to determine.

  1. In the beaker containing sewage such as crazy or sand washing yard gradually add mud precipitator after stirring.
  2. When the amount of its addition reaches a certain value, the flocs formed by flocculation in the mud sewage begin to disperse again, and the quantitative value is the appropriate amount of the slurry rapid precipitator. After many tests.
  3. Appropriate amount of mud precipitator and its addition can be selected.

Tips on Slurry Treatment

The slurry flocculant can adsorb and bridge the solid particles or aggregates in the slurry, so that the fine particles can be bridged into flocs of large particle groups, so as to achieve the purpose of self-gravity settlement or removal by mechanical equipment.

At present, the technological process of sand mechanism sand in China is as follows: the pebbles or ores are broken by crushing machinery, and the sand and stone are washed by sand washing equipment to obtain fine sand with less mud content. This process produces a large amount of sewage, the main pollutant is sediment, in which sludge suspended in the water, difficult to settle, direct discharge of water pollution is serious. At present, the sedimentation tank method used in the industry covers a large area, treatment time is long, sediment extraction is not easy, tank car transport method, high cost, can not fundamentally solve the problem.

In recent years, most of them have adopted this kind of process system, such as mud water collection sedimentation tank, secondary settling tank, clear liquid tank, mud sand separation system, dosing system, drainage system and slag discharge system. The working principle is as follows: the mud water is collected into the sedimentation tank through the pipeline, and pretreated by the mud dehydrator to remove most of the fine sand and part of the mud in the mud water, and the filtrate enters the secondary settling tank through the drainage system. The mud water of the secondary settling tank is suspended mud, and the specific gravity difference with water is very small, it must be treated with flocculant. After the mud water is treated by dehydrator, the mud sand branch removal rate is more than 95%, and the water in the clear liquid tank can be returned directly to the sand washing system, and the real zero discharge can be achieved.

Slurry flocculant is usually used with water ratio between 0.1% and 0.3%, then after mixing dissolved into glue-like water, then added to the mud sewage sand washing circulating water outlet for mixing, can quickly precipitate the suspended matter in the sewage in a few seconds, sand washing yard mud sewage is a kind of water containing fine mud particles suspended matter, and the amount of mud content is very high, so it is recommended to do a small test, determine the proportion of mud precipitator after adding, can be large quantities of sediment washing.

Common Failures & Solutions of Mud Treatment Equipment

Mud treatment equipment as a kind of separation device used to treat mud and separate liquid and solid in various sectors. Due to the facts that mud usually has the property of corrosiveness, or the treatment equipment has been in service for a certain period, some improper operation is made in use or other reasons, it is avoidably easy to cause some malfunctions or equipment failure, resulting to the device cannot work properly as expected. What are the common failures of mud separation equipment? What should be done when the mud separation equipment fails? Here are listed some common failures and corresponding repair methods for your reference.

1.Mud separation equipment idling
If the main motor idling occurs during the operation of the mud separation equipment, the power supply should be cut off first in this situation, and then the cover should be opened to check whether it is due to the material stuck in the equipment.

2.The effect of mud dehydration weakened compared with before
When the separation equipment is not able to handle the mud at run time to achieve the previous separation effect, operator can try to change a parameter at a time, or do some simple debugging to see if the failure can be accordingly solved or not. If not, then turn to the technical staff or the equipment supplier for help, and the pre-requisit is to ensure safety.

3.Mud separation equipment stops running for unknown reason.
In response to this situation, new mud separation equipment accessories can be used to replace suspicious accessories for testing, which is a relatively simple and effective treatment methods. Such method is suitable for some circuit board systems and other aspects of the problem solving. If the replacement of suspicious parts with new components can not solve the existing malfunction, operator should get the original parts back, which is less costly and more effective.

The above introduces several common failures of mud treatment equipment. In addition to the timely solution after the failure, in order to ensure the normal and safe use of mud separation equipment, operator should also carry out routine maintenance, carry out refueling maintenance for rotation of the fittings once a month , and at the same time check the lubrication of the bearing operation whether there is wear phenomenon, or whether the parts in the brake device is worn. Seriously worn parts should be replaced in time.

The mud treatment equipment produced by GN has the advantages of strong environmental adaptability and low failure rate, and generally has low requirements for the working environment and operators. If there are minor failures in peacetime, attend it timely repair, do a good job of maintenance, and the basic equipment can ensure a long service life.