SU1209897A1 - Method of determining the height of zone of producing gas- and water-conditioning fissures - Google Patents

Description

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The invention relates to the mining industry. It can be used to determine the height of the propagation of the zone of operational cracks when working the overlying rocks by mining.

The purpose of the invention is to reduce labor and material costs by reducing the number of metering wells while maintaining the specified accuracy of determining the fracture zone boundaries.

The drawing shows a diagram explaining the method.

The method is implemented as follows.

In a vertical well 1, drilled from the surface onto the reservoir 2 under development, an insulating element is inserted, for example, an inflatable rubber tampon 3 connected to the air supply carrier 4 and the pump 5. A casing 6 is installed in the wellhead, after which the well is sealed with a plug 7, the measuring instruments 8 are connected to the branch pipes. A shut-off valve 9 is installed at the mouth of the line 4. The insulating element is lifted and lowered by means of a lifting mechanism 10.

The packing of the well with the insulating element 3 begins in the rocks at a depth S of an undoubtedly undermining underworking, the value of which is determined from the mathematical expression

h Н - 80.t,

ten

15

, 09897

where N is the depth of the well, m;

m - taken out reservoir capacity, m. Having lowered the tampon 3 to the required height, line 4 is passed through

5, the hole in the plug 7 is connected to the pump 5 and the air is fed into the chamber of the tampon 3 up to a fixed pressure, at which the chamber is inflated tightly adjacent to the walls of the well and prevents gas or water from entering the downstream horizons, then close the line 4 with a valve 9 and measuring instruments 8 measure the gas evolution or measure the gas release into the well above the tampon. After the measurement cycle is completed, the valve 9 is opened, which leads to a pressure drop in the chamber, disconnecting the line 4 from the pump 5 and moving the tampon 3 along the well 1. Then, by successive approximations within the well section between the developed plate and the horizon, where the release is determined by plugging fluid (water or gas) into the well above the insulating element, while the tampon is moved in the downhole direction, i.e. down

30 in increments equal to the average thickness of the rock layers being worked up, in the absence of an increase in the natural release of the fluid, or in the direction of the wellhead, the displacement step is halved

 compared to the previous one. The minimum value of this step is determined by the value of a given accuracy in determining the boundary of the height of the zone of operational gas and water conducting cracks.

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Editor E. Papp

Compiled by N. Borscht-Kompaneets

Tehred O. Niece Proofreader L. Pilipenko

Order 483/43 Circulation 436 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch GShP Patent, Uzhgorod, Proektna St., 4

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Claims (1)

METHOD FOR DETERMINING THE HEIGHT OF THE OPENING GAS AND WATER CRACKING ZONE, including drilling from the surface of vertical wells, installing an insulating element in the well section and noticeable? The fluids of the natural release of fluids from the host rocks are sealed; the borehole section of the well, characterized in that, in order to reduce labor and material costs by reducing the number of metering wells while maintaining the specified accuracy of determining the boundaries of the fracture zone, they additionally seal the wellhead., and its isolation begins at a depth of at least h, determined from mathematical expression where C is the length of the well, m; bn is the withdrawn thickness of the formation, m, and then the amount of the released fluid is measured in the sealed section of the well above the insulating element, after which the insulating element is moved in the direction of the bottom of the well with a step equal to the average power of the layers of rocks being worked out, and the fluid is measured and compared it with the initial measurement, especially with the fluid being unchanged relative to the initial one, the next movement of the insulating element is carried out in the direction of the bottom hole on p Normal distance equal to the previous step movement, while increasing the isolation fluid insulating member is moved in the direction of the wellhead with a pitch equal to half of the previous one, wherein the minimum value of the determined step of establishing a predetermined accuracy fracture zones of heights. y o <© 00 C © m