JPS6232317B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for supplying muddy water into an underground hole for stably maintaining the excavation wall surface and removing excavation slime.
When an underground hole is excavated and muddy water escapes into the ground, a chemical solution containing isocyanate as a main component is supplied deep into the underground hole, and the area where the muddy water is lost is sealed with a solidified product of the chemical solution. Regarding construction methods.

In the above construction method, if the chemical solution is simply supplied as in the past, an extremely large amount of chemical solution is required, especially in cases where large cracks exist deeply, such as in deep bedrock, which poses a big problem in terms of economic efficiency. There are problems such as the long time required for prevention treatment, and in addition, it is difficult to control the solidification reaction of the chemical liquid. Especially in deep excavation, if the reaction rate is high, the viscosity of the chemical liquid increases in the injection pipe, making it difficult to pump the liquid. On the other hand, if the reaction rate is low, an unnecessarily large amount of chemical solution will be required due to spillage at the point where the chemical solution is lost, and the work will take a long time.

In view of the above-mentioned circumstances, the present invention provides an extremely simple and rational method that can be used easily and quickly while suppressing the amount of chemical solution supplied, regardless of the size of the crack and regardless of the depth of the underground hole. This makes it possible to reliably prevent slippage of mud, thereby enabling construction work to be carried out in an economically advantageous state and in a short period of time, especially when drilling large-scale and extremely deep underground holes such as oil wells. The purpose is to provide an effective method for preventing slippage.

In the above-mentioned method for preventing mud loss for forming underground hole excavations, the present invention provides a filler material for muddy water loss points in a state in which a chemical containing a catalyst that promotes the solidification reaction of the chemical liquid is supported on the chemical liquid prior to the chemical liquid supply. The method is characterized in that it is supplied deep into the underground hole.

In other words, before the chemical solution is supplied, the filler material becomes entangled intensively at the inlet of the sludge point or at a location relatively close to the inlet, forming a filter layer, and the increased flow resistance due to the filter layer Therefore, it is possible to effectively prevent a large amount of chemical solution from unnecessarily flowing out from an underground hole to a long distance. Moreover, by having the filler support a drug containing a catalyst that promotes the solidification reaction of the drug solution, It became easy to cause the solidification reaction to occur at an appropriate rate by not solidifying the material until it came into contact with the filler. As a result, chemical solutions can be easily and reliably supplied to desired locations, regardless of the scale or depth of the spillage location, and the chemical solution can be reliably and well solidified at the desired locations while preventing spillage, and the amount of chemicals used can be It is possible to easily and reliably prevent sludge from slipping out in a short time while reducing the amount of sludge, and a filter layer is included in the solidified material, making it possible to perform a strong and reliable seal.

The above chemical solution is mainly composed of isocyanate represented by the general formula R-(NCO) _o ,
It is a substance that polymerizes while generating carbon dioxide gas when reacting with water to produce a gel-like polymer that is insoluble in water. In the above general formula, R represents an aliphatic or aromatic group, or an organic group containing both, and n is preferably an integer of 2 or more. Typical isocyanates used in the present invention are exemplified below. That is, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,4
- and a mixture of 2,6-tolylene diisocyanate, 4,4-diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, polymethylene polyphenyl isocyanate, bitolylene diisocyanate, m-phenylene diisocyanate, 1,6 - Aromatic or aliphatic polyisocyanates, such as hexamethylene diisocyanate, 0- or m- or P-xylylene diisocyanate, methylene bis-P-phenylene diisocyanate, 2,6-diisocyanate methyl capate, or isocyanates thereof and a polyol containing active hydrogen such as polyester glycol or polyether glycol.

In addition, for the above isocyanates, for example, benzole, xylol, toluol, acetone,
Diluents such as methyl ethyl ketone, ethyl acetate, trichlorethylene, dibutyl phthalate, dioctyl phthalate, dioctyl adipate, tricresyl phosphate, or surfactants such as silicone nonionic type, or other additives as appropriate. An appropriate amount of a drug may be added.

For the above-mentioned various isocyanates, for example, triethylamine, N
Methylmorpholine, N-ethylmorpholine, dimethylbenzylamine, triethylenediamine, N,
Agents containing tertiary amines such as N'-dimethyl-2-methylpiperazine, dimethyllaurylamine, and dimethylcoconutamine, or organometallic compounds such as dibutyltin laurate and stannath octate are added to the filler. Use it in a supported state.

Examples of the filler include asbestos tailings, ragweed, wood shavings, pulp fibers, glass fibers, cotton, feathers, straw, fibrous substances such as cotton seed residue, perlite, lump clay,
Granular or powdery substances such as bentonite, water rhinoceros, mineral rhinoceros, vermiculite, cork, coke, peat, flaky substances such as porridge, cellulose flakes, fish scales, cellophane, shells, fruit shells such as cotton, etc. pomace, walnut shells, ground material,
Porous materials such as sponges, various other materials, and combinations thereof can be used.

In addition, for fillers, for example, dimensional adjustment,
Treatments such as particle size adjustment, water content adjustment, washing, and other various pretreatments can be performed.

Further, in order to support a drug containing a solidification reaction promoting catalyst on these fillers, it is sufficient to simply impregnate or adhere the drug in a liquid state.

Next, embodiments of the construction method of the present invention will be described with reference to illustrative drawings.

As shown in Fig. 1A, an underground hole 2 is drilled and formed using a drill bit 3a while muddy water 1 such as bentonite is supplied into the underground hole 2 to maintain stability of the excavated wall surface and remove excavated slime. to form oil wells, natural gas wells, etc.

As shown in Figure 1B, when the bottom of the underground hole 2 encountered the mud slipping point A, the drill bit 3a was pulled up a little and the filler carrying the agent containing the solidification reaction promoting catalyst was mixed into the muddy water 4. Drill rod 3b in condition
It is supplied to the inside of the underground hole 2 to reach the deep part of the underground hole 2.
As a result, the filling material supplied into the underground hole 2 flows to the mud slipping point A together with the muddy water 1, and as shown in Fig. 2A, the filler material 5 is placed relatively close to the entrance of the mud slipping spot A. are intertwined and caught, forming a filter layer.

Next, as shown in FIG.
The liquid 6, which is heavier than the chemical solution 7 and does not react with them, is supplied as a spacer into the drill rod 3b, and the chemical solution 7 is subsequently supplied into the drill rod 3b, so that the muddy water 1 in the drill rod 3b is
The chemical liquid 7 is removed by the spacer liquid 6, and the chemical liquid 7 is poured into the underground hole 2 while preventing a solidification reaction between the chemical liquid 7 and the muddy water 1 in the drill rod 3b.
from the drill bit 3a. As a result, by the action of the filter layer of the filler 5, the flow out of the chemical solution 7 is suppressed, and the solidification reaction of the chemical solution 7 is promoted by the catalyst supported on the filler 5, so that the reaction solidification of the chemical solution 7 is grows in a state that includes the filler layer, and as shown in FIG.
This seals the leakage point A very effectively.

In addition, when supplying filler into an underground hole, first supply a large-sized filler to narrow the area where mud is lost, and then supply a smaller-sized filler to ensure sufficient clogging. may be performed. In addition, various changes can be made to the method of supplying the chemical solution and the filler.

Furthermore, the present invention can be applied to the formation of underground hole excavations for various purposes.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the method for preventing sludge loss for forming underground hole excavations according to the present invention, and FIGS. 1A to 3C are explanatory diagrams of the method, and FIGS. . 1... Muddy water, 2... Underground hole, 5... Filling material, 7... Chemical solution, A... Mud water loss location.

Claims (1)

[Claims] 1. When the muddy water 1 is supplied into the underground hole 2 to maintain the stability of the excavated wall surface and remove the excavated slime, when the muddy water 1 is lost into the ground during excavation and formation of the underground hole 2, A method of supplying a chemical solution 7 containing isocyanate as a main component to a deep part of the underground hole 2, and sealing the muddy water loss location A with a solidified product of the chemical solution 7, in which, prior to supplying the chemical solution 7, the chemical solution 7 is A slurry removal method for forming an underground hole excavation, characterized in that the filling material 5 for the mud water loss location A is supplied to the deep part of the underground hole 2 in a state in which a drug containing a catalyst that promotes the solidification reaction of item 7 is supported. Prevention method.