How to pull a pipe out of a well with your own hands: methods and techniques
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You have to remove the old casing for various reasons and there are several methods
How to solve the problem in practice?
The aquifer resembles an ordinary well of small diameter, but its depth is many times greater. For the full functioning of the "water supply" its walls must be protected from landslides. For this purpose, casing pipes are hammered into the drilled hole, and inside insert operational, so that the spring water is always clean.
In accordance, the diameter of the inner tube is slightly narrower, than the casing cross section. The best option is to use double pipes, which is more economical. They also strengthen the soil, and do not allow contact with spring water soil sediment, ensuring its purity.
Drilling a water well is a time consuming process, and over time, the casing becomes unusable and requires replacement. It is also possible:
- depletion of the source;
- corrosion of pipes;
- change in the chemical composition of water;
- occurrence of landslide of mine walls.
Warning! It is quite possible to extract steel pipes from a well. Asbestos-cement products are also used for wells in the suburbs, but they become fragile over time. It is almost never possible to get such columns intact.
Few are aware:
- to what depth of horizon pipes reach;
- what processes take place in the aquatic environment;
- as well as the degree of wear of the production and casing and how to determine it.
Steel or plastic pipe is easy to remove, but asbestos-cement upholstery can break during work
The operation of the well is also full of unexpected situations, including the ingress of foreign objects, which can only be obtained together with casing. This time-consuming activity involves additional material costs. If you have a question - how to remove the casing from the well, important to know, what material it is made of. Steel is the most reliable and strong. Lightweight plastic and polymer are much more economical than steel and stronger than asbestos-cement products, therefore occupy an average product position in their niche.
Frequent reasons for casing replacement:
- damage or corrosion;
- clogging the well or reducing its lumen;
- high degree of equipment wear.
It is desirable to divide the whole process into stages. The well is prepared to remove the pipe, removing surface equipment for water supply.
How to remove the outer pipe from a well-worn well?
Without special devices and equipment, which is traditionally used for external extraction (casing) pipes, in this matter can not do. From deep wells cylindrical fragments can be obtained with the help of so-called "tubes". Also can PONAB winch and jacks of large capacity. Still necessary flooring for support, consisting of beams, rails or metal beams.
Lifting equipment is required to remove the pipe, example, winch
Working with a jack, it is important to prepare the wellhead in advance, to provide access and convenience in receiving pipes. The easiest way to remove damaged items is to use:
- metal clamps.
- swivel plugs;
- metal beams;
- welding machine;
- jack.
Hydraulic equipment with a jack is mounted above the prepared wellhead. Then the tool for capturing the pipe is installed by attaching special clamps. When the capture is organized correctly, remove the upholstery with a jack will not be difficult. The rest of the pipe, which does not need to be removed, can be cut on the spot with a welding machine. The extracted parts are stored in a pre-prepared place, from where they are easy to ship and take out.
pay attention! To simplify the removal of pieces of equipment, it is desirable to consider this process at the stage of laying the well. Before, how to remove casing from a well or remove fragments of damaged equipment, it is important to measure the depth of the well.
What is a "fishing tool"?
Emergency work to remove stuck fragments of rusted pipes, pump, large objects at the bottom of a deep and narrow well, wells or abandoned columns produce fishing tools of 2 types:
- mortise bells for external capture;
- threaded tubes.
When eliminating accidents in wells use a fishing tool, one of the options which is a bell
You can get the old pipe from the well in parts or whole. But this is taken into account, that possible rupture of the formation, vertical displacement of the well or seasonal disruption of water circulation inside it, which complicates the removal of casings.
Catching bells (spears) there are through and non-through. The specificity of the through bell involves the passage through its base of the extracted damaged fragment. Next is the external equipment (threaded couplings) make a notch, to get the riser. External pipes are removed with the help of taps.
Pipe traps have a different design:
- collet type;
- bushing and die;
- combined.
It is possible to use catch milling cutters to lift the fragments up, stuck in a sloping well. This equipment allows you to capture by inserting into the extracted pipe. If fragments of the column jammed, they are removed from wells by means of hydraulic clearings, which create vibrating shocks. This tool is most often used by professionals from specialized companies.
washing method
Before, how to try to pull a pipe out of a well, it is important to assess the extent of damage. Keep in mind, that clogging the well and the gradual destruction of equipment is a normal process. A precipitate forms at the bottom, and the casing structure rusts and gradually falls apart, as its surface is covered with cracks and splits. The chemical composition of the soil is also important - too acidic environment is more destructive, ніж нейтральна або лужна.
If the casing is made ??of metal, then it will collapse under the influence of natural factors and will have to think about its replacement in a short time
Depending on the degree of neglect of the well, choose one of the methods, determining the scope of work:
- seating and rinsing the entire riser;
- tension and replacement of structural parts;
- dismantling of casing and service pipes.
Tension is associated with the use of a hoist or winch, to pick up the pipe by the upper edge and pull to the break. This part is removed from the well, then the catching equipment is picked up by other fragments of the column. It is important to work this way, so that the fragile parts of the pipe do not get stuck in the wellbore. It is best to use a hydraulic jack. Such equipment is not always effective, especially if the mine is drilled at an angle or there is a shift of layers. Wide pipes and considerable depth of the well also complicate the extraction of damaged fragments. From such well the casing is quite often taken out after washing of system of water supply system by means of the pump and the specialized equipment..
The column is connected to the pump and flushing equipment, starting work under minimum pressure, then gradually increase the pump load and water supply.
Warning! Extraction of column fragments is also possible in other ways, example, with immersion of the tool with a carving, which when rotating counterclockwise walks the column and rotates it until the end of the excavation.
Is it always appropriate to remove the trim from an old well?
To remove a narrow casing from an old well, which has great depth, it takes a lot of effort and experience. Deciding, whether to remove the pipes, flush or drill a new well, it is important to consider:
- terms of well use;
- construction material;
- degree of pollution;
- reasons for dismantling;
- fishing tools are available;
- depth of immersion of equipment.
Lifting a pipe from a well is a time-consuming and costly process, which is not always justified
In some cases, it is theoretically possible to solve, how to get a pipe out of a well, but this is not always possible. Example, if the heavy worn-out equipment at considerable depth - at appreciable shift of a vertical of a well. There is a break in the winch or loss of equipment at great depths with incorrect assessment of the scale of work. A specialist in this field always assesses the degree of risk, to decide whether to do it at all.
Sometimes the problem is solved in another way - it is easier to insert a product of smaller diameter into a wide service pipe. Then the outer riser will serve as a casing, and the collapsing foundation will be an additional barrier between the soil and the pipeline.
Even if the audit of the well will be performed by hand, always useful expert advice, which will assess the scale of work and the degree of risk. Dismantling of the old structure is not always required, especially when obvious, that it will fall to pieces during extraction. Often the costs are not justified, and easier to make a new well.
