It is necessary to be considered the various factors research challenge at the wells’ protection process from their sanding up, for the theoretical researches confirmation.
I. The laboratory – bench and development tests have been carried out, without interrupting the wells’ operation technological process.
– The Well № 1 – the water hammer presence at the pump restarting, and, as a result of the increased turbulence (e.g. flows whirling pool), there is the abundant occurrence of the suspended particle:
V∙ρ = m1; (2)
m1·q = F1. (3)
– The Well № 2 – at the КОР-1.0 check valve presence, with the adjustable opening time, by the complete water hammer absence, at the repeatedly restarted deep well pump, and, therefore, there are the reduced turbulence phenomenon and the complete suspensions absence in the water:
V·ρ = m2; (5)
m2·q = F2 (6)
and as a result of:
q > a; F1 < F2.
II. The production process testing and the corresponding technological tests – this is the simultaneous water pumping during 10 days and nights (e.g. 240 hours), with the use of the two turbine meters of the BB-50 cold water for the water volume measuring, having flowed through the well № 1 and the well № 2 pipelines, simultaneously at the temperature up to 30 °С and the pressure up to 1 MPa:
The well № 1: The well № 2:
V·ρ = m1; V·ρ = m2; (8)
m1·Ci = G1; m1·Ci = G2; (9)
where Ci – the specific concentration of the suspensions.
As a result, by the obtained data, we can see, the specific concentration of the sandy suspensions is very high and the volume of the settled sand is great, that in the well № 1, which has no the check valve with the adjustable opening time, and also the artificial structure of the pebbly filter. The specific concentration density is quite so small, that in the sedimentation tank, we don’t find the settled sand in the well № 2, having equipped with the check valve with the adjustable the opening time, and the artificial pebbly filter structure.
The production – processing and technological (e.g. operating) experimental tests have already been carried out during the 3 summer months (e.g. 92 days and nights): June, July, and August – in the season of the greatest use of the water resources. So, the check valve КОР-1.0 had been temporarily installed at the production – processing and technological tests on the well № 1, as a result of which the completely different experimental data were received, which were then recorded in the tests log, where the sand content in the samples was decreased significantly, in comparison with the previous samples. The well flow rate has been remained the same, and it has been equaled to Q = 6,5 m3/h or Q = 156 m3/day, at the fine sand content 20 g per 1 m3 water or 312 g/day.
So, the experimental data readings from the samples, having taken during the production – processing and technological tests during the 92 days and nights of the experiments have already been given the stable results by the production rate Q = 14,8 m3/h. or 355,2 m3/day, at the fine sand content 0,001 g/qm3 in the well № 2, having equipped by the artificial pebble filter and by the check valve КОР-1.0, This was given us every reason to be believed, that the experimental tests had already been confirmed the choice correctness of the input parameters of the processes under their study.
So, the statistic data and the theoretical analysis results have already been allowed, according to the researches plan A, B, C, to be justified the setting ranges and the varying levels of the input parameters to be obtained the statistics equations and the aerohydrodynamics at the operating pumping out:
where J – the change in pressure; Рk – the pressure; Сk – the suspensions concentration; t – the time.
The equation of the aerohydrodynamics flow patterns:
– the increase (flow rate) quantity of flow equation:
a) by the inflow increasing;
b) by the filtration coefficient increase:
where Vd.v – the depressive funnel volume; Кf – the filtration coefficient.
– the external and internal forces interaction equation at the artificial pebbly filter installation:
– the kinetics and aerohydrodynamics equation for the nominal characteristics:
The variation limits in the factors, under the production – processing and technological exploitation conditions, at the maximum water selection and sampling intake regime, have been allowed to be taken the mathematical description making up production of the initial and the boundary conditions, the differential equations of the processes:
The work is submitted to the International Scientific Conference «Science and education pressing questions», Russia (Moscow), May, 21-24, 2013, came to the editorial office оn 29.04.2013.