CN1125321C - Local wall stress relieving method for well drilling - Google Patents
Local wall stress relieving method for well drilling Download PDFInfo
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- CN1125321C CN1125321C CN 01126815 CN01126815A CN1125321C CN 1125321 C CN1125321 C CN 1125321C CN 01126815 CN01126815 CN 01126815 CN 01126815 A CN01126815 A CN 01126815A CN 1125321 C CN1125321 C CN 1125321C
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Abstract
The present invention relates to a local wall stress relieving method for a well drilling. The method has the following steps: recording the wall surface strained state of well wall surface before and after the relieving load; making the un-installation of the rock as an elasticity process and obtaining three principal stress quantities of terra stress and three directions through the modulus of elasticity of the rock; executing the stress relieving to the adjacent local wall surfaces of the well wall, wherein the adjacent local wall surfaces have the mutual spacing which is about 5 times the length of the diameter of the well wall local surface, and the directions are various; combining various conditions of the local wall surface strain capacity to obtain the quantity value of the crustal stress. The present invention completely avoids the problem of breaking core of the stress reliving method of sleeve drillings and radically overcomes the serious disadvantage of the method of hydrofracturing. The present invention can be applied to shallow drillings, deep drillings, vertical wells and oblique wells.
Description
Technical background
What the present invention relates to is a kind of stress relieving method, and particularly a kind of local wall stress relieving method for well drilling belongs to the Geotechnical Engineering field.
Background technology
Geostress survey is a crucial problem in the great construction project, is example with the underground works, correctly measures the terrestrial stress of rock mass, be the foundation of correct and reasonable computation Underground Engineering Excavation load, so geostress survey is very important.Find through retrieval: " the rock mass terrestrial stress and the engineering construction " of work such as author Liu Yunfang prior art, Hubei science tech publishing house, in September, 2000 first published, P47-P175, this book reduces the method for directly measuring terrestrial stress at present both at home and abroad in drilling well: the stress relief method that 1, adopts cover brill technology at the bottom of the boring hole; 2, apply the hydraulic fracturing of highly pressurised liquid in a certain hole of boring section.First method is to bore an aperture (tens of centimetres approximately of yardsticks) along drilling axis at the bottom of the boring hole, measurement mechanism is lowered in the aperture (has many dissimilar devices), continue then to lower edge boring carrying out overcoring, by removal hole bed rock core lithostatic stress, principle stress value and the direction that can calculate the two and three dimensions terrestrial stress according to the survey record and the core deformation modulus of measuring equipment.This method exists not enough, as: disconnected core problem difficulty was given solution when boring was dark, can only use in not dark boring.The hydrofracturing ratio juris is one section boring of packing in certain section of boring, pump into then highly pressurised liquid to this section a boring hole wall rock pressure break of exerting pressure.Calculate terrestrial stress according to the various eigenwerts on the press process line.The method is defectiveness also, analytical approach is based on a fundamental assumption-be the parallel drilling axis of certain principal direction of stress of terrestrial stress, the value of this principle stress equals γ h (γ-rock capacity when boring is upright opening, the h-superincumbent stratum thickness), this has had a strong impact on the rationality of measurement result based on defective supposition.
Summary of the invention and embodiment
In order to improve the method for in drilling well, measuring terrestrial stress, overcome the deficiency and the defective of aforesaid two class methods, the present invention proposes a kind of local wall stress relieving method for well drilling, this method both can be used in the more shallow boring, also can be used in the very dark boring, the terrestrial stress that can also be applied to vertical shaft and inclined shaft is measured.
The rock mass of earth's crust different parts all contains stress field information, and the borehole wall wall exists stress field information too.Several local walls to the borehole wall in the very away minor segment in same drilling well are measured, and the stress state of these local walls are measured value and the direction that goes out three principle stresses of country rock terrestrial stress with regard to deducibility.
Borehole wall wall is noted the wall strain regime that discharges forward and backward, to the unloading of rock as an elastic process, elastic modulus by rock can draw three principle stress values of terrestrial stress and three directions, 3 contiguous on borehole wall local walls are carried out the stress complete solution to be removed, the mutual center distance of 3 contiguous local walls is 30 centimetres, and the orientation is different, and the situation of change of the dependent variable of these 3 local walls that survey is read is combined, and obtains the value of terrestrial stress.
Below further the present invention is specifically described: in borehole wall local surfaces, to ring groove of borehole wall rock mass deep cutting around borehole wall local surfaces, 3 centimetres of ring groove internal diameters, cutting groove depth is 1.5 times promptly 4.5 centimetres of internal diameter, every strain on this borehole wall local surfaces will gradually reduce zero by the cutting of ring groove like this, so the local wall upper stress of the borehole wall will all be removed.If on borehole wall local surfaces, be pasted with sensor, if the resistance-strain film clips of being made up of the resistance strain gage of three different directions are as long as the result who has 3 local borehole wall wall stress complete solutions of the vicinity of three different azimuth to remove so just can find the solution acquisition by the inconsistent equation group.Set up the problem of stress concentration of Sidewall Surrounding Rock and the relation of boring coordinate system and stress field coordinate system, just can derive direction and the value of drilling well at three principle stresses of the stress field of this section country rock.
The present invention has substantive features and marked improvement, at first be not need cover to bore, be not subjected to the restriction of drilling depth, the disconnected core problem of having avoided cover to bore stress relief method fully, moreover do not need to do the supposition of a certain principal direction of stress and value, fundamentally overcome the great disadvantage in the hydraulic fracturing.The present invention can be applicable to shallow boring and gun drilling, also can be applicable to vertical shaft and inclined shaft.
Claims (4)
1, a kind of local wall stress relieving method for well drilling, it is characterized in that borehole wall wall is noted the wall strain regime that discharges forward and backward, to the unloading of rock as an elastic process, elastic modulus by rock can draw three principle stress values of terrestrial stress and three directions, 3 contiguous on borehole wall local walls are carried out the stress complete solution to be removed, the mutual center distance of 3 contiguous local walls is 30 centimetres, and the orientation is different, the situation of change of the dependent variable of these 3 local walls that survey is read is combined, and obtains the value of terrestrial stress.
2, this local wall stress relieving method for well drilling according to claim 1, it is characterized in that in borehole wall local surfaces, to ring groove of borehole wall rock mass deep cutting around borehole wall local surfaces, 3 centimetres of ring groove internal diameters, cutting groove depth is 1.5 times promptly 4.5 centimetres of internal diameter, every strain on this borehole wall local surfaces will gradually reduce zero by the cutting of ring groove like this, so the local wall upper stress of the borehole wall will all be removed.
3, this local wall stress relieving method for well drilling according to claim 1 and 2, it is characterized in that on borehole wall local surfaces, being pasted with sensor, if the resistance-strain film clips of being made up of the resistance strain gage of three different directions are as long as the result who has 3 local borehole wall wall stress complete solutions of the vicinity of three different azimuth to remove so just can find the solution acquisition by the inconsistent equation group.
4, this local wall stress relieving method for well drilling according to claim 1 and 2, it is characterized in that setting up the problem of stress concentration of Sidewall Surrounding Rock and the relation of boring coordinate system and stress field coordinate system, just can derive direction and the value of drilling well at three principle stresses of the stress field of this section country rock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01126815 CN1125321C (en) | 2001-09-20 | 2001-09-20 | Local wall stress relieving method for well drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01126815 CN1125321C (en) | 2001-09-20 | 2001-09-20 | Local wall stress relieving method for well drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1337570A CN1337570A (en) | 2002-02-27 |
| CN1125321C true CN1125321C (en) | 2003-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01126815 Expired - Fee Related CN1125321C (en) | 2001-09-20 | 2001-09-20 | Local wall stress relieving method for well drilling |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270967B (en) * | 2008-04-30 | 2011-08-31 | 中国水电顾问集团华东勘测设计研究院 | Stress-relief blasting method |
| CN102182437B (en) * | 2011-04-19 | 2013-09-25 | 河南理工大学 | Method for determining and eliminating hydraulic fracture stress boundary of coal mine underground drilling |
| CN102426069B (en) * | 2011-08-29 | 2013-04-17 | 中国科学院武汉岩土力学研究所 | Measurement method for rock mass crustal stress under extremely high stress condition |
| CN102564653B (en) * | 2012-02-01 | 2014-01-08 | 中国人民解放军第二炮兵工程设计研究所 | Method for measuring geostress during formation of disk-shaped rock cores in high-geostress area |
| CN102979520A (en) * | 2012-12-20 | 2013-03-20 | 上海交通大学 | Horizontal hole ground stress measurement device based on BWSRM (Borehole Wall Stress Relief Method) principle |
| CN103076120B (en) * | 2012-12-29 | 2014-08-27 | 上海交通大学 | Surface stress reliving device for excavation face of underground cavern |
| CN103743500B (en) * | 2013-12-24 | 2016-03-09 | 广西科技大学 | A kind of measuring method of automobile panel erection stress |
| CN104453849A (en) * | 2014-10-20 | 2015-03-25 | 成都创源油气技术开发有限公司 | Shale gas reservoir three-dimensional geological stress predication evaluation method |
| CN105181199B (en) * | 2015-05-13 | 2017-08-25 | 中国科学院武汉岩土力学研究所 | A kind of side hole stress relief method of detecting earth stress |
| CN105092107A (en) * | 2015-06-03 | 2015-11-25 | 成都理工大学 | Method for measuring crustal stress in the presence of rock core disking in well drilling area with high crustal stress |
| CN113605887B (en) * | 2021-09-30 | 2022-01-14 | 中国科学院武汉岩土力学研究所 | Deep drilling complex environment local wall stress relief test method and system |
| CN115127716B (en) * | 2022-09-01 | 2022-11-25 | 云南省交通投资建设集团有限公司 | Rock mass parameter in-situ test system and method by small local wall stress relief method |
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2001
- 2001-09-20 CN CN 01126815 patent/CN1125321C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1337570A (en) | 2002-02-27 |
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