CN-121993093-A - Water-surge grouting isolation method for abandoned well barrel

CN121993093ACN 121993093 ACN121993093 ACN 121993093ACN-121993093-A

Abstract

The invention relates to a method for separating water from a waste well barrel by grouting, belonging to the field of mine water damage treatment. The method comprises the following steps of investigating and detecting geological conditions and current situation of a abandoned shaft, constructing a borehole outside the shaft, enabling the borehole to be separated from the edge of the shaft by a certain distance, using directional drilling technology to drill the shaft at a certain depth, further detecting geological and hydrologic conditions in the drilling process, and constructing a water blocking plug with a certain thickness in the shaft through drilling cement paste to block water in a water-bearing layer from entering the lower part of the shaft. The invention has the beneficial effects that the water blocking plug is constructed in the abandoned shaft through drilling grouting, the purpose of isolating water in the water-bearing layer from entering the lower part of the shaft is achieved, the construction process is simple, the investment is low, the water blocking effect is good, and the safety is ensured.

Inventors

HAO MANYI
CHANG YONGJIE
WU JIAN
LI YANFENG
YANG YONGQIANG

Assignees

郝满义

Dates

Publication Date: 20260508
Application Date: 20260322

Claims (1)

1. An abandoned well barrel water-flushing grouting isolation method. The method comprises the following steps of investigating and detecting geological conditions and current situation of a abandoned shaft, constructing a borehole outside the shaft, enabling the borehole to be separated from the edge of the shaft by a certain distance, using directional drilling technology to drill the shaft at a certain depth, further detecting geological and hydrologic conditions in the drilling process, intermittently injecting cement slurry into the borehole, constructing a water-blocking plug with a certain thickness in the shaft, and blocking water in a water-bearing layer from entering the lower part of the shaft.

Description

Water-surge grouting isolation method for abandoned well barrel Technical Field The invention relates to the field of mine water damage treatment, in particular to a method for separating water from a waste well barrel by grouting. Background The water disaster is one of main disasters threatening the safe production of the coal mine, the old kiln water accumulation is a main water source for disaster water, and the treatment of the old kiln water accumulation is an important link of the water prevention and control work of the coal mine. The coal exploitation history in China is long, a large number of small coal mines exist in the shallow part of the coal seam, the shaft is not sealed and filled after some small coal mines are closed, and even some abandoned small coal mine shafts are communicated with an aquifer, so that the safety exploitation of deep coal mines is threatened. Some abandoned shaft is partially collapsed and connected with an aquifer, the water accumulation level buries 24.5m, the water is pumped under the shaft, the water pump can only pump down to the depth of 50m, sundries are filled at the lower part, the water pumping quantity reaches 150m 3/h, the shaft wall has water spraying sound, the tissue drill machine drills and detects on the shaft, the depth of 51m meets the filler, the drilling is very difficult, the deepest drilling reaches 59m, the fished object is plastic air duct cloth, wood blocks and cement-bonded red bricks (the shaft is built by the red bricks), and quartz sandstone pebbles with the diameter of ten centimeters. Analysis showed that the well bore was abandoned and collapsed and plugged over time and the water accumulation source was from the water in the alluvial layer. In view of the inability to continue drilling in a wellbore, nor is the conventional method of filling a wellbore implemented, the present invention proposes a method of abandoned wellbore water injection isolation. Disclosure of Invention The invention provides a method for separating water-flushing grouting of a abandoned well, aiming at the specific situation that the well wall of the abandoned well collapses, but the well is not filled, water-bearing layer water is still conducted to threaten a deep mine, and the conventional well filling scheme cannot be implemented. The method comprises the following steps of investigation and detection of geological conditions and current situation of abandoned shafts, construction of drilling holes on the outer sides of the shafts, drilling of the drilling holes at a certain distance from the edges of the shafts, further detection of geological and hydrological conditions in the drilling process in the shafts by using directional drilling technology, construction of water-blocking plugs with a certain thickness in the shafts by grouting cement paste into the drilling holes, and isolation of water in water-bearing layers from entering the lower parts of the shafts. The method comprises the following specific steps: 1. The depth of the abandoned shaft and the situation of penetrating through the stratum are investigated, the collapse situation of the well wall is observed, and the filling situation and the ponding situation of the shaft are detected. 2. And constructing a borehole outside the shaft, wherein the borehole is separated from the edge of the shaft by a certain distance, the caliber of the borehole meets the minimum size required by the processes of isolated lamination, directional drilling, grouting and the like, the thickness of the lamination is detected, the grouting sleeve is put into stable bedrock, the directional drilling technology is used for drilling the shaft, and geological and hydrological conditions are further detected in the drilling process. 3. And (3) intermittently injecting cement slurry through the drilling hole, observing the water level change of the shaft and the upward return condition of the cement slurry until the grouting pressure reaches the final pressure requirement, and forming a water blocking plug in the shaft to achieve the aim of isolating water in the water-bearing layer. The invention has the beneficial effects that the water blocking plug is constructed in the abandoned shaft through drilling grouting, the purpose of isolating water in the water-bearing layer from entering the lower part of the shaft is achieved, the construction process is simple, the investment is low, the water blocking effect is good, and the safety is ensured. Drawings In order to more clearly illustrate the technical solution of the present invention, the following description will briefly make reference to the accompanying drawings. FIG. 1 is a schematic diagram of a construction of a borehole grouting isolated abandoned wellbore aquifer in an embodiment of the invention. FIG. 2 is a schematic illustration of a wellbore after grouting to form a water blocking plug in an embodiment of the invention. In the figure, a well bore 1, a well b