SU1384732A1 - Method of constructing filters of process wells - Google Patents

Description

The invention can be used in geology for the extraction of minerals, as well as in other areas of industry in the construction of technological wells.

The aim of the invention is the compaction of the filtering material, as well as the reduction of filter sanding due to the maintenance in a steady state of the scientific research institute of the filter zone of the reservoir.

FIG. Figure 1 shows the scheme for carrying out the method at the time after the threshold; in fig. 2 - the same, when operating the well.

The method is as follows.

The reservoir is opened by the borehole 1, in which the production string 2 is placed up to the reservoir. Then the perforated frame 3 is placed within the productive horizon and the material is introduced into the well bore 1 area expanded within the reservoir within the known formation. Expansion of a well can be carried out either with the help of downhole monitors or with the help of mechanical expanders.

Two types of material are fed into the zone: filtering dusting, for example, gravel, krzangano-grained sand, etc., and a solid loose additive that swells when in contact with the fluid. As an additive, known solid bulk materials that swell under the action of water, acids, alkalis, etc. can be used. An important condition for this is that the said additive, when reacting with the fluid, should not give clogging precipitates that may impair the permeability of the filtering bed. Here porous granular polymeric materials can be used, characterized by the presence of cross-links. For example, when using sulfuric acid as a fluid for leaching a metal, granular sorption resins — ionites with granule sizes 0.3–5 mm can be used as a swelling material. When the ion exchanger is immersed in the solution, it swells. Due to the presence of cross-links, granules do not break. The use of granular porous polymers is desirable due to the fact that even with strong swelling, the array of their granules retains their permeability and through it, in some way or another, the fluid will be filtered.

The material is fed into the filter zone in portions with alternating filtering and solid granular additives with the formation of alternating horizontal layers 4 and 5 of filtering and swelling materials within the backfill interval, the additive being served both first. and last, i.e. create a safety cushion of this material in the lower and upper parts of the filter.

After the above materials are filled up, when the well is put into operation, the material in the layers 5 is sufficiently fast to swell; The filter material occurs evenly over the entire height of the backfill interval. During compaction, materials bulge unstable rocks in the filter zone of the reservoir and effectively keep them from collapsing, which prevents active sanding of the filtering material and filter. In this case, the repacking of the filtering material does not occur. In the areas of the entire backfill interval, since this is counteracted by layers 5 of the swollen material. Thus, the proposed method allows you to simply and effectively increase the technological performance of a well, increasing the stability of gravel bedding, rocks of the reservoir filter zone, eliminating the likelihood of active repacking of filter bedding, reducing sanding of the filter material and filter and minimizing the likelihood of destruction filter.

Due to the fact that the permeability of the layers 5 of the swollen material is significantly lower than the permeability of the layers 4 of the filtering material, it is advisable to place each layer 5 of the swelling material in the interval between the rocks with increased permeability to filter the fluid inflow to the filter. For example, when leaching fossil minerals from sandy clay layers, it is advisable to place layers 5 of the swelling material opposite the sandy layers, and layers 4 of the filter material opposite the clayed layers, permeability.

with low

The advantages of using ion exchangers, for example, amberlite, as a swelling granulated material are that, if necessary, by replacing the gravel bed and filter, you can regenerate the swollen ionite using extractants and easily remove both the filter itself and the filtering and swelling material from the well. for example, by using a spacer or by airlift.

Claims (2)

Claim 1. Method for constructing filters of a tipping and solid granular additive interacting with a fluid, characterized in that, in order to compact a filtering material, as well as to reduce filter sanding by maintaining a steady state of the filter zone of the reservoir, the flow of filtering is made portions alternating with portions of a solid free-flowing additive, the latter being supplied first and last, and a material swelling as a result of solid, dry additive fluid. 2. The method according to claim 1, wherein, in order to equalize the filter bandwidth natural wells, including ras-20 being constructed in a reservoir with a layered permeability, portions of solid granular additives are served in the interval of the highly permeable layer of the reservoir. well widening within the reservoir, installation of a perforated frame and filtering feed  constructed in a reservoir with a layered permeability, portions of solid granular additives are served in the interval of the highly permeable layer of the reservoir. Fuy. / FIG. 2