SU1006751A1 - Method for protecting production well with gently sloping coal seams and with the well extending through water-bearing formation - Google Patents

Abstract

METHOD OF PROTECTING THE TECHNICAL WELL AT A SUSTAINED PLANE OF COAL STRAYS AND CROSSING THE WATER-HORIZONTAL HORIZONT, which involves creating a filled annulus between the casing and the rock walls of the well bore. characterized in that, in order to increase the efficiency of well protection by reducing the loss of coal in the safety pillar and the cost of fixing the well, before running the casing on its outer surface, an anti-friction coating is applied on the outer surface of the well to the area installed against the well-crossed aquifer in the area from the bottom of the well of the aquifer to the top and above the roof of the latter, it is filled with a pliable bulk material, rial, and in the area from the soil to the roof of the aquifer On this, the trough space is filled with concrete, while the width of the safety valve (Pellet in the plane of the reservoir from the borehole axis is determined from the ratio d Sm + 0.05H, where d is the width of the rear sight, m; m is the thickness of the reservoir, M} H - the depth of the intersection of the soil reservoir well, m. SP

Description

The invention relates to the mining industry and can be used in the protection of a technical well, which during operation has experienced the effect of clearing workings when this well crosses an aquifer. There is a known method of guarding a technical well at a canopy of alelegany coal seams and at the intersection of an aquifer well, including the creation of a filled annulus between the casing and rock walls of the well, and leaving the safety pillar Cl. However, this method is not sufficiently effective due to large losses of coal in the safety pillar and significant costs for securing the well. The aim of the invention is to increase the efficiency of well control by reducing the loss of coal in the safety pillar and the cost of fixing the well. The goal is achieved by the fact that, according to the method of protecting a technical well, when the canopy is lined with coal seams and the aquifer / toe zone crosses this well, including the creation of a filled annular space between the casing and the rock walls of the well and leaving the safety pillar before running the casing on its outer surface, an anti-friction coating is applied to the site, installed against the water-bearing horizon intersected by the well; the bottom of the well to the soil of the aquifer and above the roof of the latter is filled with durable bulk material, and in the area from the soil to the roof of the aquifer the annular space is filled with concrete, and the width of the safety pillar in the plane of the reservoir from the well axis is determined from the ratio d 5t + 0.05H,

where d, is the width of the rear sight, m; m - reservoir thickness, m; H - the depth of the intersection of the soil

well, m

The drawing shows a well a vertical section along the strike, as well as portions of the annular space to be filled with pliable granular material and concrete.

The method is as follows.

d 5t + 0,05N,

where d is the pillar width, m;

m - reservoir thickness, m;

H - the depth of the intersection of the soil

reservoir well, m. This method allows to significantly increase the efficiency of technical well protection, reduce the loss of coal in the safety pillar and reduce the costs of fixing the well. Before lowering into the well 1 casing 2 on its outer surface in the area installed against the well intersecting aquifer 3, an anti-friction coating is applied to enable the shear-displaced rock mass to be moved relative to the casing. After descending into the hole of the casing 2, the annular space in section 4 from the bottom of the well to boundary 5, located below the soil of the aquifer 3, by an amount that isolates the latter, is filled with compliant bulk material. The next section of the annulus 6, located opposite to the aquifer 3 crossed by the well and having a length ensuring the isolation of the aquifer both from the soil and from the roof, is filled with concrete. In the course of concreting the specified section 6, there is no seizure between concrete and pipe 2, as well as to ensure the water tightness of the external surface of the concrete section b adjacent to the external surface of pipe 2, this section of pipe with antifriction coating applied to its external surface in front of cnycKOiyi the borehole 1 is closed with a welded jacket made of sheet iron, which is temporarily attached to the pipe 2. At the beginning of the displacement of the surrounding borehole rock mass, this connection, breaking and array are moved relative to the casing. The next portion of the annulus -7, located above the aquifer, is filled with compliant bulk material. To protect a technical well, a safety pillar is left around it, the size of which in the plane of the reservoir from the borehole axis is determined from the ratio

Claims (1)

METHOD FOR PROTECTING A TECHNICAL WELL DURING A SHELF DEPOSIT OF COAL LAYERS AND CROSSING THIS WELL OF A HYDROGEN HORIZON, which includes creating a filled annulus between the casing pipe and rock walls of the well and preserving the safety of the well, with the aim of decreasing the safety of the pillar, due to the fact that the coal is protected in order to reduce the safety of the well the safety pillar and the cost of fixing the well, before lowering the casing on its outer surface to a section set against the intersection with an aquifer borehole, an anti-friction coating is applied, the annulus in the section from the bottom of the well to the soil of the aquifer and above the roof of the latter is filled with pliable bulk material, and in the section from the soil to the roof of the aquifer, the annulus is filled with concrete, while the width of the guard the pillar in the plane of the reservoir from the axis of the well is determined from the ratio <1 = 5tp + 0.05N, where d is the width of the pillar, m; m is the thickness of the reservoir, m; N is the depth of the intersection of the soil of the formation borehole, m SU „„ 100675.1