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No Progress, No Development, See How Oilfield Washing Trucks Break The Tradition
Dec 19, 2018

[Automobile knowledge] With the increasingly strict requirements of safety and environmental protection, the oil pool will gradually be delayed, and 82.6% of the injection wells will face difficulties in washing wells. Therefore, finding a new way of washing wells instead of the traditional well washing method is a breakthrough that must be implemented in the water injection process.


  With the increasingly strict requirements of safety and environmental protection, the oil pool will gradually be stagnation, and 82.6% of the injection wells will face difficulties in washing wells. Therefore, finding a new way of washing wells instead of the traditional well washing method is a breakthrough that must be implemented in the water injection process.

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Traditional well washing method:


 There are two traditional ways of washing wells: one is to completely wash the well, that is, to use the injection pump of the large station, the system water, and the sewage from the water injection station; the second is to wash the well in the semi-system, because there is no sewage recovery process, wash Well water can only enter the oil field of the well site, but if the rainy season comes, the liquid level of the oil pool will increase, and the well washing will be restricted, which will affect the cleanliness of the wellbore and cause the wellbore to be blocked. The water injection volume will drop and the oil well washing vehicle will When it appears, it replaces the traditional way of washing wells.


New well washing method:


  The special equipment for oil field washing truck is mainly composed of the second type of automobile chassis. It is mainly composed of two parts: one is the power transmission part of vehicle water treatment, which is composed of power take-off, drive shaft, reduction gear box, coupling and three cylinder. The piston pump is composed of a three-cylinder plunger pump. The main function of the three-cylinder plunger pump is to return the treated washing water to the wellbore to provide power. The second is the part of the vehicle water treatment equipment, which is filtered by a cyclone desander, a sloping plate degreaser and a walnut shell. The main function of the fiber ball filter is to treat the sewage returned from the wellbore of the water injection well into qualified water through the vehicle-level sewage treatment equipment.


The working principle of oilfield washing truck:

  The wellbore water is de-sanded by a cyclone desilter; then enters the sloping plate degreaser to remove most of the oil particles; then enters the walnut shell filter to remove oil and impurities, and finally enters the fiber ball filter to remove smaller ones. Impurities; the treated water enters the clean water tank, and the filtered water in the clean water tank is transported into the casing annulus by a three-cylinder plunger pump to form a circulating wash well.

The advantages of oil field washing trucks and traditional well washing methods:


1. System washing has a great impact on the whole system. As the washing wastewater is recovered, it will increase the burden on the sewage treatment. In the case of high water tanks, excessive sewage in large stations, and tight handling, well washing is restricted. At the same time, the single well washing well accounts for 20-30 square meters per hour, the main line pressure drops greatly, and other wells basically do not form water. The longer the well washing time, the greater the influence on other wells, which also causes well washing. The main factor of thoroughness. The washing truck has its own power and sewage treatment device, and the sewage is washed and treated. The well washing process does not affect other wells, and does not increase the burden on the sewage treatment of the station. Therefore, the wellbore can be cleaned and the well washing time is not limited until the well is qualified. Moreover, the washing truck adopts the off-road self-propelled chassis, which can adapt to the characteristics of the oilfield road and the movement operation, and adopts the engine on the vehicle as the washing power to overcome the disadvantages of no power supply in the water injection wellhead.


2. Save investment. The traditional well washing method has no recovery process for 82.6% of the wells. It is necessary to build a full sewage recycling process. It also requires an investment of 4.5 million yuan at a time, which is huge and economically unfeasible. Even if the whole sewage recovery process is completed, 48% of the water injection pumps will reach the required displacement of the well washing. Each time the well is washed, the hydraulic vehicles and tank cars are needed. The cost of the shift is up to 4,000 yuan at a time. It takes more than 1.5 million yuan. Repeated investment is not economically viable.


3. It is not subject to the water quality limitation of external well washing. The system water washing well can only meet the water quality of the import and export at the same time, and even if the water quality of the external water used in the washing truck is unqualified, the water quality after washing the well may be qualified.


4, can meet environmental requirements. For sewage-free recovery pipelines, washing wells entering the oil pool will cause environmental pollution. The sewage treatment equipment on-board sewage treatment not only saves water, but also avoids environmental pollution caused by sewage discharge.


Summary: The application of the washing truck has changed the traditional way of washing wells, which has made the washing work get unprecedented progress. From the promotion and application of the well washing truck to the present, the water quality of the wellbore has been fundamentally changed, which has played a powerful role in ensuring the smooth development of water injection in the oilfield.


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