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Nearly horizontal high pressure-bearing drilling sealing method and sealing structure

A high pressure bearing and hole sealing technology, which is applied in sealing/isolation, earthwork drilling, gas discharge, etc., can solve problems such as low sealing efficiency, long sealing time, and difficulty in meeting pressure-bearing hole sealing requirements. Achieve high sealing efficiency, low sealing cost and good sealing effect

Inactive Publication Date: 2015-11-25
重庆市能源投资集团科技有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it brings the disadvantages of long sealing time and low sealing efficiency
And even so, it is difficult to meet the sealing requirements of pressure-bearing holes under high pressure

Method used

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  • Nearly horizontal high pressure-bearing drilling sealing method and sealing structure
  • Nearly horizontal high pressure-bearing drilling sealing method and sealing structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1, see figure 1 , figure 2 , A near-level high-pressure drilling and sealing method, including the following steps:

[0028] a. An enlarged hole 2 with a depth of 1.3~1.8m and a diameter larger than that of the high pressure drilled hole 1 is formed at the orifice of the high pressure drilled hole 1, and the enlarged hole 2 is connected to the high pressure drilled hole at the lower bus bar. 1Inside cutting, so that the inner step formed between the enlarged hole 2 and the high-pressure-bearing borehole 1 has a part located above the bus bar of the high-pressure borehole 1;

[0029] b. Send the grouting pipe 3 for hole sealing and the fracturing pipe 4 for fracturing or drainage that are fixed together by the holding clamp 7 into the high pressure borehole 1 to set the depth, and the return pipe 5 into The depth is set in the enlarged hole 2, and the nozzles of the grouting pipe 3, the fracturing pipe 4 and the grouting pipe 5 are located outside the orifice of the...

Embodiment 2

[0032] Example 2, see figure 1 , figure 2 , A near-level high-pressure-bearing drilling and sealing structure, composed of an inner sealing section and an outer sealing section. The connecting section connected to the inner sealing section on the outer sealing section is infused with cement slurry simultaneously with the inner sealing section The inner and outer sealing sections are respectively formed in the high-pressure-bearing borehole 1 and the enlarged hole 2. The enlarged hole 2 is located at the orifice of the high-pressure borehole 1, and the enlarged hole 2 is at the lower bus bar and the height The pressure-bearing borehole 1 is cut inward so that the inner step formed between the enlarged hole 2 and the high-pressure-bearing borehole 1 has a part located above the bus bar of the high-pressure borehole 1.

[0033] A part of the grouting pipe 3 and the fracturing pipe 4 are sealed in the inner sealing section and the outer sealing section. The grouting pipe 3 and the f...

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Abstract

The invention discloses a nearly horizontal high pressure-bearing drilling sealing method and a sealing structure. The nearly horizontal high pressure-bearing drilling sealing method comprises that an enlarged hole is formed on an orifice of a high pressure-bearing drilling hole, a part which is arranged above a high pressure-bearing drilling upper bus is arranged on an inner step of the enlarged hole, a grouting pipe and a fracturing pipe are feed into the high pressure-bearing drilling hole, a return pipe is feed into the enlarged hole, orifices of the grouting pipe, the fracturing pipe and the return pipe are arranged outside an orifice of the enlarged hole, the orifice of the return pipe is higher than an upper bus of the enlarged hole, a sealing segment is formed on the orifice of the enlarged hole through polyurethane, and expansion cement slurry is filled into the high pressure-bearing drilling hole through the grouting pipe and is solidified. The sealing structure comprises an inner sealing segment and an outer sealing segment, a segment in the outer sealing segment and the inner sealing segment are formed by being synchronously filled with cement, the diameter of the outer sealing segment is bigger than the inner sealing segment, and an upper bus of the outer sealing segment is higher than an upper bus of the inner sealing segment. The nearly horizontal high pressure-bearing drilling sealing method and the sealing structure have the beneficial effects that the nearly horizontal high pressure-bearing drilling sealing method is simple, high in sealing efficiency and excellent in effect. The sealing structure can effectively eliminate influence of contraction joints or a hollow top to sealing effect of a sealing hole, and is high in pressure-bearing ability.

Description

Technical field [0001] The invention relates to a sealing technique for a near-horizontal hole, in particular to a near-horizontal high-pressure-bearing drilling and sealing method and a sealing structure. Background technique [0002] Sealing of high-pressure near-horizontal holes is widely used in coal seam cracking and gas drainage or high-pressure grouting reinforcement projects. The existing plugging methods include forming cement mortar plugging section and polyurethane plugging section in the pressure-bearing hole. Due to the particularity of the nearly horizontal hole, the cement mortar is subjected to gravity when the hole is sealed, and the lower part of the hole pipe is tightly sealed. However, the top of the arc of the orifice tube is prone to shrinkage joints or hollow roofs, which cannot form a tight sealing section, resulting in poor sealing effect and low pressure. At present, most of the holes are sealed by secondary grouting of expanded cement to reduce or elim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/26E21F7/00
Inventor 郭臣业李栋黄昌文覃乐刘明远周东平周俊杰张尚斌沈大富徐涛王联何华
Owner 重庆市能源投资集团科技有限责任公司
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