Application of mud non-landing treatment system

With the rapid development of economy, environmental protection has been paid more and more attention, which has a greater impact on the exploration industry.

Mud as the "blood" of the drilling industry, in the drilling process has the role of protecting the well wall, carrying rock debris, cold reagents, etc., and in the process of deploying mud requires the use of a large number of chemical reagents, so there are new environmental protection requirements in the disposal of waste pulp.

With the drilling mud non-landing treatment system is gradually being applied, and has achieved good results, has been recognized by the relevant departments, and gradually promoted.

Working principle of drilling mud non-landing treatment system

The drilling mud non-landing treatment system is to decompose the waste mud into water, cuttings, and mud cake through a set of treatment processes, and the water can be directly purified to reach the standard of reuse or direct discharge. The cuttings can also be directly discharged or retained after dehydration and drying. The mud cake (can also be mixed with dried cuttings) can be mixed with cement, curing agent and water in proportion to make concrete, brick, etc. To realize the recycling and utilization of solid waste slag, the whole treatment system includes: cuttings separation unit; Mud and sand water separation unit; Press filter drying unit; Wastewater purification unit.

Cuttings separation

The cuttings separation unit comprises a first tank body, a vibrating screen located in the first tank body, and a drying screen located outside the first tank body, a first tank body connected to the mud and sand separation unit, a drying screen connected to the mixing tank body, a first guide channel between the vibrating screen and the drying screen, and a first baffle arranged in the first guide channel.

As the drilling begins and progresses, the original slurry circulates through the wellbore, carrying a large amount of cuttings. The slurry flows out of the wellbore and passes directly through the shaker to separate the larger cuttings from the slurry. The separated cuttings are dried and discharged or left for use. At this stage, without adding chemical reagents, the cuttings and mud are separated directly by mechanical equipment, and part of the mud continues to be used for production after separation, which will reduce the discharge of waste pulp and save part of the cost.

Sand water separation

The mud and sand water separation unit comprises a second tank and a third tank, a desander and a desilter in the two tanks, a centrifuge in the third tank, and a screw feeder outside the second tank and the third tank. The feeding length of the screw feeder covers the arrangement length of the desander, desilter and centrifuge, and the screw feeder is connected with the mud-water storage regulating box; A second guide channel is arranged between the discharge port of the desander, desilter and centrifuge and the screw feeder, and a second stop plate is arranged in the second guide channel;

The second guide channel is set from the corresponding discharge port to the tilt of the screw feeder. After the waste mud is separated by rock debris, the primary mud mortar, rock debris and waste liquid are separated. The primary mud mortar is passed into the mud sand separation unit, the rock debris is collected, and the waste liquid is passed into the mixing tank. Then, the primary mud mortar is separated into the secondary mud mortar and primary mud mortar through the mud sand separation unit, the secondary mud mortar is recycled, and the primary mud mortar is passed into the mud water storage and regulation box. Through the mud-water storage adjustment box speed regulation and adjustment into the mixing tank, and then through the dosing bucket into the reagent, through the agitator to get the secondary mud and sand liquid, the secondary mud and sand liquid into the press filter drying unit.

Press filtration drying

The filter drying unit comprises a dryer located adjacent to the clean water tank, a conveyor connected to the dryer, and a liquid supply pump located between the dryer and the mixing tank. The mud cake and waste water are obtained by the secondary mud and sand liquid through the press filtration and drying unit. The mud cake is collected and mixed with cement, curing agent and water in proportion to make concrete and brick, etc. The waste water passes into the purification and treatment unit.

Wastewater purification

The waste water purification unit comprises a purification treatment body connected with the filtration and drying unit, and a clean water tank communicated with the purification treatment body. The clean water tank is communicated with the mixing tank and the dosing tank body. The wastewater is treated by the purification treatment body to obtain the purified water and stored in the clean water tank, which can supply water to the mixing tank and the dosing tank.

The cuttings separation unit, the sand and water separation unit, the press filtration drying unit and the wastewater purification unit are all installed in the drilling construction area. The drilling mud treatment system also includes backup tanks and storage tanks adjacent to the cuttings separation unit and the mud and sand separation unit, which are used to replace the damaged tank and the secondary mud after storage treatment, respectively.

The drilling mud on-ground treatment system also includes a collection unit for receiving cuttings and mud cake, and a curing treatment unit connected to the collection unit.

The application of drilling mud without landing technology has great advantages over the traditional treatment methods.

Firstly, the waste slag in the waste mud is recovered and treated by the mud non-landing treatment system, and the waste water is recovered and reused, which greatly reduces the area of the well site, shortens the preparation time in the early spudding period, and saves the construction time and cost.

Secondly, the waste mud is harmless treated, the treated mud is recycled, and the construction cost is saved.

Thirdly, the environmental pollution is treated from the source, the waste mud is basically treated while drilling, shortening the previous treatment cycle, and the waste water continues to be recycled after treatment, such as: preparing mud, configuring treatment agents, etc., saving part of the cost;

Fourth, it ADAPTS to the current development situation of our country and meets the requirements of green exploration.

As the state and local governments have shown great importance to environmental protection work, many areas have clearly pointed out that they can not use direct discharge, burial, in-situ solidification burial and other methods for waste mud treatment, which requires our exploration companies to change the previous treatment methods, especially in some famous scenic spots for geothermal exploration, environmental problems are particularly prominent. The local government's supervision of the environment is relatively strict, and the punishment of enterprises that cause pollution is also relatively serious, so it provides a good development prospect for the drilling mud treatment system.