The method of pre-drainage field

 

(57) Abstract:

The inventive exercise geodynamic zoning array field with his assessment of the stress state and have vodopadnyaya well in unloaded areas of the array. 1 Il.

The invention relates to a method of drainage of irrigated fields and can be used when selecting drilling locations of wells intended for water supply.

There is a method of pre-drainage of fields, in which vodopadnyaya well designed for pumping water from the water reservoir, have the correct nodes of the grid.

The disadvantages of this method is unreasonable costs for the construction of wells, the flow rate of which is insignificant, and the increase in terms of pumping, which is due to take into account the real structure of the flooded reservoir and its stress state.

There is also known a method (prototype) preliminary drainage fields, in which vodopadnyaya well feature groups (shrubs) in Moldovia parts of the folds or in the flooded areas of tectonic disturbances.

However, the zone of maximum water loss of species due to neravnomernosti zones of the rock mass permeability is significantly reduced and the fluid pressed in the area of discharge. As a result, the efficiency of the wells located in stressed areas is reduced. So when Bush location of wells due to the inclusion of a block structure of the array and its stress state increases the drying time and the costs of operating the wells.

The purpose of the invention is improving the efficiency of pre-drainage.

This goal is achieved by the fact that produce geodynamic zoning field emitting active blocks of the array and assessment of the stress state and have vodopadnyaya well in unloaded areas of the rocks.

The drawing shows the implementation of the proposed method.

The method is as follows. Using the method of geodynamic zoning based on the use of topographic maps, aerial and satellite images of different scales, geological, geophysical, geomorphological and other materials in the field area 1 allocate tectonically active blocks 2, which define the stress state of rock massif (see Geodynamic zoning of mineral resources. Methodical instructions. L., 1990).

To characterize the stress state of rocks in blockhouses section 1 outline contour 3 set the contours plots of discharge 4 and have vodopadnyaya wells 5 mainly in these areas.

Implementation of the proposed method is possible on the basis of the fact that most arrays of ore and coal deposits are in conditions of sharply inhomogeneous stress state. Available in an array of heterogeneity result in tectonically stressed and unloaded zones. In tectonically stressed zones under high stress is elastic compression of rocks with decreasing porosity and wringing of fluids in the area of discharge. When pumping water from the unloading area develops supporting rock pressure, which further prigruzhat surrounding rocks, stimulating the washing fluid into the discharge region. Thus, the draining of the aquifer rocks will be more effective in a shorter time and with a minimum number of active wells.

It is known that the stress state of the rock mass can be described on the basis of geodynamic zoning, identifying block structure of the array and evaluating the interaction of blocks (see (I. M., Petukhov, I. M. Geodynamic zoning fields when designing and operating a mine. M.: Nedra, 1988).

The magnitude of the effective stress can be calculated in fractions of geostat the wife in the contour.

By drawing contour lines are the outlines of tectonically stressed and unloaded zones. At the location of the dewatering wells in tectonically unloaded areas of the massif will create favorable conditions for increasing their flow rate and effective drainage of adjacent areas of the array. On the contrary, at the inception of the wells in tectonically stressed zones of the drying effect will be greatly reduced due to the negative impact of rock pressure filtration of fluid from the discharge zone to the zone prigruzki (to the well).

For example, these patterns are clearly expressed when pumping fluid from the reservoir to Cucirca-Kingofsat field response. In particular, it was found that the maximum average daily flow rate calculated over a period of 30 years, have wells located in the zones of discharge. In this case the points of maximum flow rates offset Moldovia parts of the field.

Tectonically tense and unloaded zones and coal deposits of Kuzbass. For example, for mine d'angers-southern Kuzbass determined the ratio of principal stresses as 0,7:1:1,3. The maximum and minimum compressive stresses Aquifer sandstones form a wide basin. As a result of calculations defined zone configurations unloading and prigruzki. Under the action of pressure difference, the fluid will always be squeezed from the surrounding rocks in the unloading area. Because tectonic stresses are stable for many years, at the location of the dewatering wells in zones of discharge dewatering of the aquifer rocks will be achieved using fewer wells and for a shorter time.

The METHOD of PRE-DRAINAGE of FIELDS, including the zoning of the mountain massif of the field and drilling dewatering wells, characterized in that conduct geodynamic zoning mountain array of field emitting active blocks of the array and the evaluation of its stress state, and vodopadnyaya wells are drilled in unloaded areas of the rocks.

 

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