JPS5841397B2 - Method for preventing water loss in deep boreholes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for preventing water loss in a deep poling hole, which prevents circulating mud water from escaping from the hole wall during oil drilling, mineral resource excavation, foundation work for civil engineering structures, etc. Regarding.

Circulating mud water for drilling deep poling holes escapes into the ground from the hole walls, making it impossible to maintain the mud water head and causing hole wall collapse.

The following methods are used as conventional methods for preventing water loss.

(b) There is a method to adjust the muddy water concentration.

This method has the drawback that if the concentration of muddy water is increased, water will escape from the weak hole walls in areas where water is not lost, and if the concentration of muddy water is low, the hole walls will collapse.

(b) There is a method of adding contaminants to cement grout or cement grout.

In this method, only cement grout is used, and cement grout mixed with wood chips, rice husks, straw, etc. is placed in the deep poling hole, but circulating mud water is wasted and it takes time for the cement to harden.

Another drawback was that it penetrated only near the injection point, which could cause collapse if excavated again.

The present invention has been made in view of the above, and an object of the present invention is to provide a method for preventing water loss in a deep bore link hole, which can eliminate the above-mentioned drawbacks and reliably prevent water loss in a simple manner. It is.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 is a diagram for explaining the method of the present invention.

Figure 1a is a vertical cross-sectional view showing the state of deep poling, where 1 is a drill lot for poling, 2 is a casing, 3 is circulating mud, and the tip of drill lot 1 is a water loss layer. When it reaches this point, the circulating mud water will be lost.

FIG. 1 is a longitudinal sectional view of a cartridge A used for preventing water loss according to the present invention.

The cartridge A has a bag 9 made of a vinyl chloride film, which has a space 10 partitioned by glass plates 7 and 8 and an adjacent space 11 with the glass plate 8 in between, in a vinyl chloride tube 5 having a bottom plate 6 made of a glass plate. is provided inside.

An explosive 13 that is detonated by a timer or a water pressure sensor 12 is charged in the space 10, and an isocyanate or isocyanate that has a solidification promoting catalyst to be described later and does not itself constitute a chemical reaction system is charged in the space 11. A hydration reaction chemical solution 14 containing as a main component is enclosed.

The amount of explosive 13 is sufficient as long as it destroys the exploded bag 9 made of a vinyl chloride film and the vinyl chloride pipe 5 and scatters the hydration reaction chemical solution 14.

The hydration reaction chemical solution used in this example is an isocyanate compound represented by the general formula R-(NCO)m, and these compounds react with water and polymerize while generating carbon dioxide gas, forming a water-insoluble gel. It is a layer of material that produces a macromolecule.

Note that R represents an aliphatic or aromatic group, or an organic group containing both, and m is an integer of 1 or more.

M=2 to 6 is easy to obtain and put to practical use.

Typical examples that can be used in the present invention include a prepolymer derived from a polyol containing active hydrogen such as polyester glycol or polyether glycol and a diisocyanate and having an isocyanate group at the end, or tolylene diisocyanate, methylene bis P-phenylene These are aromatic or aliphatic polyisocyanates such as diisocyanate, 1.6-hexamethylene diisocyanate, polyarylene polyphenylisocyanate, and the like.

Examples of the monoisocyanate with m=1 include phenyl isocyanate or a compound obtained by an addition reaction between a higher alcohol and a polyisocyanate, but in general, this kind of monoisocyanate with a relatively low molecular weight has no odor or solidity in practical use. Many of them do not have much significance from the point of view of bonding strength characteristics.

In addition, when an appropriate amount of tertiary amines or an organometallic compound such as dibutyltin laurate is added to these isocyanate compounds as a solidification promoting catalyst, a polymerization solidification reaction accompanied by carbon dioxide gas generation due to contact between the isocyanate compound and water is promoted. This will be carried out even more rapidly, and the stability of the ground will be strengthened immediately.

Furthermore, by adding a diluent to the incyanate compound, a diluent consisting of a hydrophobic or hydrophilic organic solvent or a halogen element organic solvent such as penzole, quidylol, doluol, acetone, methyl ethyl ketone, ethyl acetate, trichloroethylene, alone or in combination, can be obtained. By lowering the viscosity of the incyanate compound, it is possible to sufficiently and reliably penetrate the isocyanate compound even into the ground with poor permeability.

Furthermore, an isocyanate compound mixed with a surfactant may be injected into the ground in order to control the hydration reaction rate or the stability of carbon dioxide gas bubbles. As such, it is necessary to use a compound that does not contain active hydrogen in its molecule and does not cause any chemical reaction with the incyanate compound.

Generally, isocyanate compounds polymerize and solidify when they come into contact with water, and release carbon dioxide gas when reacting with water. Therefore, when isocyanate compounds are injected into the ground gap located in three-dimensional space, the isocyanate compounds are absorbed into the ground. When it comes into contact with water, a polymerization reaction occurs, and water-insoluble gel-like polymer solids grow in the interstices of the ground, stabilizing and strengthening them, and carbon dioxide gas removes excess water around the consolidated ground. It has the effect of temporarily eliminating the chemical and expanding the effective solidification range of the chemical solution.

Furthermore, since it is a hydration-reactive chemical solution, the amount of chemical solution and gel time can be set in accordance with the water loss situation, regardless of the time it takes to reach the water loss layer or the distance it descends.

When the cartridge A constructed as described above encounters a water layer as shown in Figure 1C, it is lowered to the water layer, and when Car 1-IJ Tsuji A descends to the water layer, the timer is activated. Alternatively, the explosive 13 is detonated by the water pressure sensor 12.

This explosion destroys the vinyl chloride pipe 5 and the bag 9 made of vinyl chloride, and the hydration reaction chemical solution 14 is dispersed toward the water-dissipating shoulder wall.

Therefore, since the hydration reaction chemical liquid 14 has strong permeability, it permeates and diffuses into the water loss layer from the water loss shoulder wall.

When the hydration reaction chemical solution encounters interstitial water in the water absorption layer during permeation and diffusion into the water absorption layer, the hydration reaction agent solidifies due to the reaction with water.

Therefore, the medicinal solution will not be diluted and washed away by water.
The solidified substance is generated to fill the gaps in the water loss layer, and the gaps in the water loss layer are filled to prevent water loss.

In addition, as mentioned above, the carbon dioxide gas generated during the hydration reaction is generated rapidly and the gas pressure is strong, so the chemical solution spreads not only to areas where there is little resistance to the escape of carbon dioxide gas but also to areas where there is a lot of resistance. As a result, the chemical solution is uniformly spread and acted on over a wide range in three dimensions from the water absorption layer hole wall.

In addition, the carbon dioxide gas generated during the hydration reaction is dispersed as minute bubbles in the injected chemical solution, and the injected chemical solution does not apparently expand in volume but actively expands and penetrates into the water layer. The volume becomes larger compared to the actual amount of hydration reaction chemical solution,
It fills the cracks in the hole wall.

Therefore, leakage of circulating mud water is prevented. As explained above, according to the present invention, the equipment is simple and easy to operate, and the water leakage tank can be completely sealed off, thereby reducing the flow of muddy water.

In addition, since it has good permeability, it penetrates into the cracks in the pore walls, filling the cracks, leaving no residual material, and does not have a negative impact on muddy water.

[Brief explanation of the drawing]

FIG. 1a is a longitudinal sectional view showing the state of deep polling. FIG. 1 is a longitudinal cross-sectional view of a cartridge used in the method for preventing water loss of the present invention. FIG. 1C is a diagram for explaining the present invention in detail. A... Cartridge, 5... Vinyl chloride pipe, 6°7 and 8... Glass plate, 9... Bag, 12... Time limiter, 13... Dynamite, 14... Chemical solution.

Claims (1)

[Claims] 1. A bag containing a hydration reaction chemical solution containing isocyanate or incyanate as a main component in the deep poling hole;
When the capsule or the like is lowered to face the water escape layer, the bag, capsule, etc. is ruptured and the hydration reaction chemical solution is scattered against the launch layer, thereby separating the pore water in the ground and the hydration reaction chemical solution. The gel substance and carbon dioxide gas are generated in the cracks of the water absorption layer by the reaction with the water absorption layer, and the gel substance having a multi-foam structure containing the carbon dioxide gas bubbles fills and reinforces the cracks of the water absorption layer and stops water. A method for preventing water loss in deep polling holes.