Technology for constructing and stopping leakage of freezing borehole

Abstract

The invention discloses a technology for constructing and stopping leakage of a freezing borehole, comprising the following steps: (1) preparing a given amount of double-liquid chemical mud in a mud storage sump according to the condition of mud leakage; (2) picking up a drill and removing a drill bit, and running a hollow drill rod to the position of leakage layer, and running the hollow drill rod to the position of 2-5 m from the bottom of a borehole if mud is leaked from the bottom of the borehole; (3) hermetically communicating a mud outlet of a mud pump with the upper end of the hollow drill rod running to the position of the leakage layer by using a high pressure pipeline, and hermetically communicating a mud pumping port of the mud pump with the mud storage sump by using the high pressure pipeline; (4) uniformly stirring the double-liquid chemical mud in the mud storage sump; (5) starting up the mud pump to press the stirred-uniformly double-liquid chemical mud in the mud storage sump (3) into the mud leakage position of the freezing borehole through the hollow drill rod; (6) injecting clear water in a water storage tank into the mud storage sump and pressing the clear water in the mud storage sump into the hollow drill rod by using the mud pump to replace the double-liquid chemical grout in the hollow drill rod; (7) stopping the mud pump; (8) pulling out the hollow drill rod; (9) enabling the double-liquid chemical grout to stand in the borehole for 4-6 hours; and (10) preparing fresh mud, running the drill and starting up the mud pump for circulation and replacing the original mud and then normally drilling subsequently after cleaning the bottom of the hole.

Description

technical field [0001] The invention relates to a drilling technology, in particular to a plugging technology for freezing drilling construction. Background technique [0002] At present, in the construction of the wellbore freezing method, the drilling fluid leakage is one of the complicated problems encountered in the construction of the frozen hole. The main reasons for drilling mud leakage are loose strata and large voids; disturbed strata, collapsed areas; and poor backfilling of wellbore. The drilling slurry leakage will lead to the prolongation of the construction period of the freezing hole and the increase of the cost. If the plugging method is not selected properly, accidents such as drill sticking, hole collapse, and buried drill may also occur, and even the hole may be scrapped. China Coal No. 1 Co., Ltd. is in the drilling construction of the auxiliary shaft of Tarangaole Coal Mine by freezing method. Because the shaft has been excavated to 491m, the original ...

AI Technical Summary

Problems solved by technology

After using low specific gravity and high viscosity mud; throwing clay balls into the hole, 2-3 meters above the leakage layer, and then drilling with the lower drilling tool for compaction, etc., the effect is not very satisfactory, and the plugging longer time

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