CN115030688A - Construction process for repairing S-shaped directional freezing drilling hole on well wall - Google Patents
Construction process for repairing S-shaped directional freezing drilling hole on well wall Download PDFInfo
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- CN115030688A CN115030688A CN202210857226.8A CN202210857226A CN115030688A CN 115030688 A CN115030688 A CN 115030688A CN 202210857226 A CN202210857226 A CN 202210857226A CN 115030688 A CN115030688 A CN 115030688A
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- 230000008014 freezing Effects 0.000 title claims abstract description 219
- 238000007710 freezing Methods 0.000 title claims abstract description 219
- 238000005553 drilling Methods 0.000 title claims abstract description 63
- 238000010276 construction Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000013461 design Methods 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 13
- 239000012267 brine Substances 0.000 claims description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 206010060904 Freezing phenomenon Diseases 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/10—Preparation of the ground
- E21D1/12—Preparation of the ground by freezing
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Abstract
The invention relates to the technical field of well wall repair, and provides a well wall repair S-shaped directional freezing drilling construction process, which comprises the following steps: a group of upper vertical non-freezing holes are arranged on the periphery of the ground derrick foundation; a middle deflecting non-freezing hole communicated with each upper vertical non-freezing hole is arranged below each upper vertical non-freezing hole; a lower vertical non-freezing hole communicated with each middle deflecting non-freezing hole is arranged below each middle deflecting non-freezing hole; a lower vertical freezing hole communicated with each lower vertical non-freezing hole is arranged below each lower vertical non-freezing hole; at least two first temperature measuring holes are formed in the periphery of the ground derrick foundation, and at least two second temperature measuring holes are formed in the outer sides of the lower vertical freezing holes; a group of temperature control holes are arranged between the ground derrick foundation and the upper vertical non-freezing holes. The problem of among the relevant art derrick, derrick and unable equipment and facilities of demolising occupy the construction position of conventional freezing hole, need take measures to prevent that the frost heaving from to the influence of derrick, derrick basis, waste time and energy is solved.
Description
Technical Field
The invention relates to the technical field of well wall repair, in particular to an S-shaped directional freezing drilling construction process for well wall repair.
Background
Due to stratum settlement and other reasons, a great amount of well wall breakage phenomena occur along with the increase of time in the use process of coal mine shafts in deep topsoil layers of Henan, Anhui, Shandong and the like. The freezing method construction in the well wall repairing process has the advantages of reliable water sealing, no occupation of a shaft, no influence on production, capability of providing long-distance well wall repairing safety conditions, safety, quality, cost and construction period controllability, and good comprehensive technology and economic benefit, and becomes a preferred technology for preventing water inrush and sand gushing in well wall repairing.
However, compared with the conventional freezing, the borehole wall repairing freezing has the following problems: well heads of well shafts which are put into use are provided with well towers, derrick and various auxiliary facilities such as pipelines and passages, and some facilities such as transportation belt corridors are difficult to dismantle, and the well towers, the derrick and equipment facilities which cannot be dismantled occupy the construction positions of conventional freezing holes, so that measures are required to prevent the influence of frost heaving on the well towers and derrick foundations, which wastes time and labor.
Disclosure of Invention
The invention provides a borehole wall repairing S-shaped directional freezing drilling construction process, which solves the problems that in the related art, a derrick and equipment facilities which cannot be disassembled occupy the construction position of a conventional freezing hole, measures are required to prevent frost heaving from influencing the foundation of the derrick and the derrick, and time and labor are wasted.
The technical scheme of the invention is as follows: the S-shaped directional freezing drilling construction process for repairing the well wall is characterized by comprising the following steps:
A. a group of upper vertical non-freezing holes are arranged on the periphery of the ground derrick foundation;
B. a middle deflecting non-freezing hole communicated with each upper vertical non-freezing hole is arranged below each upper vertical non-freezing hole, and the distance between the axis of each middle deflecting non-freezing hole and the axis of the shaft is gradually reduced from top to bottom;
C. a lower vertical non-freezing hole communicated with each middle deflecting non-freezing hole is arranged below each middle deflecting non-freezing hole, and the lower end face of each lower vertical non-freezing hole is positioned above the shaft repairing section;
D. a lower vertical freezing hole communicated with each lower vertical non-freezing hole is arranged below each lower vertical non-freezing hole, and the lower end surface of each lower vertical freezing hole is positioned below the shaft repairing section;
E. at least two first temperature measuring holes are arranged on the periphery of a ground derrick foundation, the lower end faces of the first temperature measuring holes are flush with or below the lower end face of the upper vertical non-freezing hole, and at least two second temperature measuring holes are arranged on the outer side of the lower vertical freezing hole;
F. a group of temperature control holes are arranged between a derrick foundation and an upper vertical non-freezing hole on the ground, and the lower end faces of the temperature control holes are located below the derrick foundation.
In the step A, the horizontal distance between the axis of the upper vertical non-freezing hole and the foundation of the derrick is 2.3-2.7 m.
In the step A, the lower end face of the upper vertical non-freezing hole is positioned below the lower end face of the derrick foundation.
In the step B, the parameter setting of the middle deflecting unfrozen hole comprises the following steps:
b1, calculating the height H of the middle deflecting unfrozen hole: measuring the total hole depth H0, the height of an upper vertical non-freezing hole H1, the height of a lower vertical non-freezing hole H2 and the height of a lower vertical freezing hole H3 on the drilling track sectional diagram, and then H0-H1-H2-H3;
b2, calculating the horizontal displacement L of the middle deflecting non-freezing hole: measuring a horizontal distance from the axis of the upper vertical non-freezing hole to the axis of the lower vertical non-freezing hole on the drilling hole distribution plane schematic diagram, wherein the horizontal distance is L;
b3, measuring a drilling deflecting azimuth angle alpha: measuring an included angle alpha between the axial line connecting line of the upper vertical non-freezing hole and the lower vertical freezing hole and the due north direction;
b4, determining the minimum curvature radius R of the deflecting section: determining a minimum curvature radius R according to the design diameters, wall thicknesses and structures of drilling tools and freezing pipes selected for drilling, and taking the minimum curvature radius when the same drilling hole consists of the drilling tools and the freezing pipes with different specifications;
b5, determining the height h of the deflecting section: the horizontal displacement of the deflecting section is set to be L, the middle deflecting non-freezing hole comprises an upper deflecting section and a lower deflecting section which are arc-shaped, the middle of the upper deflecting section bends towards the direction far away from the shaft, the middle of the lower deflecting section bends towards the shaft direction, the curvature radiuses of the upper deflecting section and the lower deflecting section are equal to R, the horizontal displacement is equal to L/2, and then the section height h is (4 RL-L) 2 ) 1/2 ，
When the height H of the middle deflecting non-freezing hole is greater than the calculated height H of the deflecting section, firstly constructing the deflecting section with the upper height H, and constructing the rest part with the height (H-H) according to the index of the lower vertical non-freezing hole;
when the height of the middle deflecting non-freezing hole H is less than the calculated deflecting segment height H, according to the segment height formula H ═ 4RL-L 2 ) 1/2 On the premise of ensuring the flow rate of brine and the construction safety, the diameter and the wall thickness of the freezing pipe are reduced, namely the minimum curvature radius R of the deflecting section is reduced, if the diameter and the wall thickness of the freezing pipe can not be adjusted through checking calculation or the requirement can not be met after adjustment, all lower vertical freezing holes are enlargedThe radius of the deflecting unfrozen holes is reduced until H is equal to H, and if the distance between the lower vertical freezing holes does not meet the design requirement after the radius of all the lower vertical freezing holes is increased, the problem is solved by increasing the number of the lower vertical freezing holes.
In the step D, the distance between the axes of two adjacent lower vertical freezing holes is less than or equal to 2.0 m.
In the step D, the height of the lower water-proof section is more than or equal to 10.0 m.
In the step D, the part of the shaft, which is positioned on the inner side of the lower vertical non-freezing hole, is a protection section of the shaft repairing section, the part of the shaft, which is positioned on the inner side of the lower vertical freezing hole and is positioned between the shaft repairing section and the protection section, is an upper water-resisting section of the shaft repairing section, and the part of the shaft, which is positioned on the inner side of the lower vertical freezing hole and is positioned below the shaft repairing section, is a lower water-resisting section of the shaft repairing section.
In the step E, the horizontal distance between the axis of the first temperature measuring hole and the well tower foundation is equal to the horizontal distance between the axis of the upper vertical non-freezing hole and the well tower foundation, and the distances between the axes of all the second temperature measuring holes and the shaft axis are equal.
And F, enabling the height difference between the lower end face of the temperature control hole and the lower end face of the derrick foundation to be larger than or equal to 2.0m, and enabling the height difference between the lower end face of the upper vertical non-freezing hole and the lower end face of the temperature control hole to be 1.0 m.
And F, the horizontal distance between the axis of each temperature control hole and the foundation of the well tower is 0.4-0.6m, the lower end face of each temperature control hole is positioned above the middle deflecting non-freezing hole, and the distance between the axes of two adjacent temperature control holes is less than or equal to 3.5 m.
The working principle and the beneficial effects of the invention are as follows: the periphery of a ground derrick foundation is provided with a group of upper vertical non-freezing holes, a middle deflecting non-freezing hole communicated with each upper vertical non-freezing hole is arranged below each upper vertical non-freezing hole, the distance from the axis of the middle deflecting non-freezing hole to the axis of a shaft is gradually reduced from top to bottom, a lower vertical non-freezing hole communicated with each middle deflecting non-freezing hole is arranged below each middle deflecting non-freezing hole, and a lower vertical freezing hole communicated with each lower vertical non-freezing hole is arranged below each lower vertical non-freezing hole. The temperature control holes are utilized to timely detect the ambient temperature, so that the lower vertical freezing holes can avoid equipment facilities which cannot be removed from the ground, local freezing is realized, the problems that the existing derrick, derrick and equipment facilities which cannot be removed occupy the construction positions of conventional freezing holes, measures are needed to prevent the influence of frost heaving on the derrick and derrick foundations, time and labor are wasted are successfully solved, meanwhile, the drilling engineering quantity and the freezing refrigerating capacity can be greatly saved, the freezing construction period is shortened, and the freezing effect can be ensured.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a plan view of the present invention illustrating the drilling and hole arrangement
FIG. 2 is a cross-sectional view of a borehole trajectory in accordance with the present invention.
FIG. 3 is a schematic diagram of the trajectory design of a midspan whip unfrozen hole of the present invention.
In the figure: 1. the device comprises a well tower foundation, 2 parts of an upper vertical non-freezing hole, 3 parts of a middle deflecting non-freezing hole, 3-1 parts of an upper inclination increasing section, 3-2 parts of a lower inclination reducing section, 4 parts of a shaft, 5 parts of a lower vertical non-freezing hole, 6 parts of a shaft repairing section, 7 parts of a protecting section, 8 parts of a lower vertical freezing hole, 9 parts of an upper water insulation section, 10 parts of a lower water insulation section, 11 parts of a first temperature measuring hole, 12 parts of a temperature control hole, 13 parts of a second temperature measuring hole, 14 parts of a third temperature measuring hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall be included within the scope of protection of the present invention.
The specific embodiment of the construction process for repairing the S-shaped directional freezing borehole by the borehole wall comprises the following steps:
A. a group of upper vertical non-freezing holes 2 are formed in the periphery of an earth surface derrick foundation 1, the lower end face of each upper vertical non-freezing hole 2 is located below the lower end face of the derrick foundation 1, the horizontal distance between the axis of each upper vertical non-freezing hole 2 and the derrick foundation 1 is 2.3-2.7m, and as shown in fig. 1 and 2, the horizontal distance between the axis of each upper vertical non-freezing hole 2 and the derrick foundation 1 is preferably 2.5m in order to prevent frost heaving from affecting the derrick foundation 1 according to the size and specific field conditions of the derrick foundation 1 of a main well;
the number of the upper vertical non-freezing holes 2 is determined according to the diameter of a well wall of a shaft repairing section 6, the design thickness of a freezing wall and the distance between the axes of two adjacent lower vertical freezing holes 8, as shown in fig. 1, all the upper vertical non-freezing holes 2 and first temperature measuring holes 11 are uniformly arranged on the periphery of a rectangular well tower foundation 1, and the three first temperature measuring holes 11 are respectively positioned at one corner of the well tower foundation 1;
B. set up the unfreezing hole 3 of middle part whiplash rather than the intercommunication in the vertical unfreezing hole 2 below in every upper portion, the axis of the unfreezing hole 3 of middle part whiplash to the interval between the 4 axes of pit shaft from top to bottom reduce gradually, and wherein, the parameter setting of the unfreezing hole 3 of middle part whiplash includes:
b1, calculating the height H of the middle deflecting unfrozen hole: measuring the total hole depth (namely the distance between the lower end surface of the lower vertical freezing hole and the ground) to be H0, the height of the upper vertical non-freezing hole 2 to be H1, the height of the lower vertical non-freezing hole 5 to be H2 and the height of the lower vertical freezing hole 8 to be H3 on the cross-sectional diagram of the drilling track, wherein H is H0-H1-H2-H3;
b2, calculating the horizontal displacement L of the middle deflecting unfrozen hole: measuring the distance between the axis of the upper vertical non-freezing hole 2 and the axis of the lower vertical non-freezing hole 5 on the drilling and hole distribution schematic plan
The horizontal distance of (a) is L;
b3, measuring a drilling deflecting azimuth angle alpha: measuring the included angle between the axial line connecting line of the upper vertical non-freezing hole 2 and the lower vertical freezing hole 8 and the due north direction, namely alpha, and knowing the hole positions, knowing which direction each S-shaped freezing hole consisting of the upper vertical non-freezing hole 2, the middle deflecting non-freezing hole 3, the lower vertical non-freezing hole 5 and the lower vertical freezing hole 8 deflects (forms a clockwise included angle with the due north) can be constructed according to the designed deflection amount;
b4, determining the minimum curvature radius R of the deflecting section: the minimum curvature radius R is determined according to the design diameter, the wall thickness and the structure of a drilling tool and a freezing pipe which are selected for drilling, the minimum curvature radius is taken when the same drilling hole is composed of drilling tools and freezing pipes with different specifications, and the minimum curvature radius R of the drilling hole is 215.0 m;
b5, determining the height h of the deflecting section: the horizontal displacement of the deflecting section is set to be L, the middle deflecting non-freezing hole 3 comprises an arc-shaped upper deflecting section 3-1 and a lower deflecting section 3-2, the middle of the upper deflecting section 3-1 bends towards the direction far away from the shaft 4, the middle of the lower deflecting section 3-2 bends towards the direction of the shaft 4, the curvature radiuses of the upper deflecting section 3-1 and the curvature radiuses of the lower deflecting section 3-2 are equal to each other and are R, the horizontal displacements are equal to each other and are L/2, and then the section height h is (4 RL-L) 2 ) 1/2 ，
When the height H of the middle deflecting non-freezing hole 3 is larger than the calculated height H of the deflecting section, firstly constructing the deflecting section with the upper height H, and constructing the rest part with the height (H-H) according to the index of the lower vertical non-freezing hole 5;
when the height H of the middle deflecting non-freezing hole 3 is less than the calculated deflecting segment height H, according to the segment height formula H ═ 4RL-L 2 ) 1/2 On the premise of ensuring the flow rate of brine and the construction safety, the diameter and the wall thickness of the freezing pipe are reduced, namely the minimum curvature radius R of the deflecting section is reduced, if the diameter and the wall thickness of the freezing pipe can not be adjusted or can not meet the requirement after the adjustment by checking, the radius of all lower vertical freezing holes 8 is increased, namely the horizontal displacement L of the middle deflecting non-freezing hole 3 is reduced, the adjustment is carried out until H is H, and if the radius of all lower vertical freezing holes 8 is increased, the distance between the lower vertical freezing holes 8 can not meet the design requirement, the problem is solved by increasing the number of the lower vertical freezing holes 8;
C. a lower vertical non-freezing hole 5 communicated with each middle deflecting non-freezing hole 3 is arranged below each middle deflecting non-freezing hole, and the lower end face of each lower vertical non-freezing hole 5 is positioned above the shaft repairing section 6;
D. a lower vertical freezing hole 8 communicated with each lower vertical non-freezing hole 5 is arranged below each lower vertical non-freezing hole 5, the part, located below the shaft repairing section 6, of the lower end face of each lower vertical freezing hole 8, of the shaft located on the inner side of each lower vertical non-freezing hole 5 is a protecting section 7 of the shaft repairing section 6, the part, located inside the lower vertical freezing hole 8, of the shaft located between the shaft repairing section 6 and the protecting section 7 is an upper water-resisting section 9 of the shaft repairing section 6, the part, located inside the lower vertical freezing hole 8 and located below the shaft repairing section 6, of the shaft located between the shaft repairing sections 6 is a lower water-resisting section 10 of the shaft repairing section 6, the distance between the axes of two adjacent lower vertical freezing holes 8 is smaller than or equal to 2.0m, and the height of each lower water-resisting section 10 is larger than or equal to 10.0 m;
E. at least two first temperature measuring holes 11 are arranged on the periphery of the ground derrick foundation 1, the lower end faces of the first temperature measuring holes 11 are flush with or positioned below the lower end faces of the upper vertical non-freezing holes 2, at least two second temperature measuring holes 13 are arranged on the outer sides of the lower vertical freezing holes 8, the horizontal distance between the axis of each first temperature measuring hole 11 and the derrick foundation 1 is equal to the horizontal distance between the axis of each upper vertical non-freezing hole 2 and the derrick foundation 1, and the distances between the axes of all the second temperature measuring holes 13 and the axis of the shaft 4 are equal;
F. a group of temperature control holes 12 are arranged between a ground well tower foundation 1 and an upper vertical non-freezing hole 2, the lower end faces of the temperature control holes 12 are positioned below the well tower foundation 1, the horizontal distance between the axes of the temperature control holes 12 and the well tower foundation 1 is 0.4-0.6m and preferably 0.5m, the lower end faces of the temperature control holes 12 are positioned above a middle deflecting non-freezing hole 3, the distance between the axes of two adjacent temperature control holes 12 is less than or equal to 3.5m, the height difference between the lower end faces of the temperature control holes 12 and the lower end face of the well tower foundation 1 is greater than or equal to 2.0m, the height difference between the lower end faces of the upper vertical non-freezing hole 2 and the lower end faces of the temperature control holes 12 is 1.0m, the hole number and the hole opening distance of the temperature control holes 12 are determined according to cold exchange calculation, in the invention, the distance between the axes of two adjacent temperature control holes 12 is set to 3m, and a third temperature control hole 14 is arranged between the temperature control hole 12 and the upper vertical non-freezing hole 2, for measuring the temperature of the temperature control holes 12, as shown in fig. 1, four third temperature measurement holes 14 are arranged on the periphery of the rectangular derrick foundation 1.
Example 1 as shown in fig. 1 and 2, the inside diameter of a shaft 4 is 5.0m and the outside diameter thereof is 8.2m, a derrick foundation 1 surrounds the periphery of the shaft 4, the length D of the outer wall of the derrick foundation 1 in the left-right direction and the front-rear direction is 25.0m, a derrick door is positioned right in front of the shaft 4, a belt corridor is positioned right behind the shaft 4, 24 lower vertical freezing holes 8 are provided on the periphery of the shaft 4, the distance between the axis of each lower vertical freezing hole 8 and the axis of the shaft 4 is 5.6m, three second temperature measuring holes 13 are provided between the lower vertical freezing holes 8 and the derrick foundation 1, nine temperature control holes 12 and six upper vertical non-freezing holes 2 are provided at the front, rear, left, and right of the derrick foundation 1, the distance between the axis of the upper vertical non-freezing holes 2 and the axis of the shaft foundation 1 is 2.5m, the distance between the axis of the upper vertical non-freezing holes 2 and the axis of the shaft 4 is 15.0m, the distance between the axis of the temperature control hole 12 and the shaft tower foundation 1 is 0.5m, and the three first temperature measurement holes 11 are respectively positioned at the left front part, the right front part and the right rear part of the shaft tower foundation 1. The diameters of the upper vertical non-freezing hole 2, the middle deflecting non-freezing hole 3, the lower vertical non-freezing hole 5, the lower vertical freezing hole 8, the first temperature measuring hole 11, the temperature controlling hole 12 and the second temperature measuring hole 13 are all 0.6 m.
In order to ensure that the drilling track is smooth and beneficial to the downward placement of the freezing pipe, the front half section of the height h of the construction section adopts an inclination increasing drilling mode, namely the inclination increasing is carried out according to the design curvature radius, the rear half section adopts an inclination reducing drilling mode, the drilling hole is ensured to be smoothly transited to a lower straight hole section according to the design curvature radius, the solid line section on the left side in the figure 3 is a schematic diagram of a lower inclination reducing section 3-2, the solid line section on the right side is a schematic diagram of an upper inclination increasing section 3-1, the curvature radii of the upper inclination increasing section 3-1 and the lower inclination reducing section 3-2 are equal to each other, the horizontal displacements are equal to each other, the height displacements are equal to each other, and are h/2, and R is equal to each other, then R is h/2 2 ＝(h/2) 2 +(R-L/2) 2 From this, it can be derived that h ═ 4RL-L 2 ) 1/2 If the height H of the middle deflecting non-freezing hole 3 is larger than the height H of the deflecting section, the deflecting section with the height H above is constructed, and the rest part with the height H-H is constructed according to the index of the lower vertical non-freezing hole 5.
The upper vertical non-freezing hole 2, the lower vertical non-freezing hole 5 and the lower vertical freezing hole 8 are constructed according to the conventional freezing hole, and the inclination measuring equipment used by the middle deflecting non-freezing hole 3 during construction is as follows: the error of the azimuth angle is less than or equal to +/-0.5 degrees; the error of the oblique angle (0-70 degrees) is less than or equal to +/-0.05 degrees; a high-speed high-precision continuous gyro inclinometer system with the tool face angle error less than or equal to +/-0.5 degrees; the method has the advantages that the build angle of the screw drill is determined according to the build rate of the minimum curvature radius and the stratum hardness, the build angle capability of the screw is ensured to be slightly larger than the design build rate of the drill hole, the sliding drilling of a build section is increased to the greatest extent, and the construction efficiency is improved. A screw drilling tool with the diameter of 146 and the deflection angle of 1 degree is selected as a normal deflection screw, and meanwhile, a standby screw drilling tool with the angle of 1.5 degrees is used for dealing with special conditions such as large formation inclination angle.
In order to ensure the deflecting effect and the construction efficiency, an inverted drilling tool combination is adopted, and the drilling tool combination for bedrock design is as follows: phi 216mm drill bit +146 screw drill + phi 73mm drill rod + phi 121mm drill collar + phi 121mm spiral drill collar + phi 146mm drill collar + phi 121mm drill collar + phi 159mm spiral drill collar + phi 73mm drill rod; the surface soil section drilling tool comprises the following components: phi 216mm drill bit +146 screw drill + phi 73mm drill rod + phi 121mm spiral drill collar. The fine tuning may be performed according to the specific formation.
In the construction of the deflecting section of each drilling hole, a direction finder and a screw drill are matched for deflecting, in order to improve the deflecting effect, the deflecting drilling section adopts sliding drilling, and the steady-deflection drilling adopts a composite drilling mode; the construction provides the stratum effect of rectifying through constantly summarizing, and the angle of making is bored to adjustment drilling tool combination, screw rod, improves the section efficiency of construction that makes to one side.
And (3) timely carrying out drilling inclination measurement after 9m (one drill rod) of construction of an inclination making section, analyzing and judging whether the top angle and the direction of a drill hole meet the construction requirements, and continuing drilling if the top angle and the direction of the drill hole meet the construction requirements. If the vertex angle and the direction of the drill hole do not meet the expectation after the inclination measurement, artificial directional construction is carried out through a directional instrument and a screw drill. When the actual top angle of the drilled hole is higher than the requirement of the deflecting top angle, the top angle construction is reduced through a screw drill so as to inhibit the development speed of the drilling hole; otherwise, the top angle construction is increased through the screw drill to promote the development speed of the screw drill. And (4) adjusting the direction of the drilled hole while adjusting the top angle, and repeating the construction process until the drilled hole deflection meets the design requirement.
In order to better ensure the directional drilling quality, the following measures are taken:
firstly, establishing a directional special management group consisting of related personnel to ensure the smooth implementation of directional construction;
secondly, the inclination measuring and orienting equipment is the key of the whole orienting construction, and electrical measuring personnel pay attention to the performance parameters of the inclination measuring and orienting equipment constantly, check the equipment in time and ensure the precision of the equipment;
thirdly, the inclination measurement data needs to be checked on the map in time, and technicians predict the development trend of the drill holes in time;
determining reasonable inclination measuring section height according to the drilling deviation condition on the principle of less attendance measurement, and timely correcting the inclination once the drilling track is found to be out of limit;
fifthly, the captain operates personally during directional deviation correction drilling to ensure the deviation correction effect;
sixthly, the sharp bend and the dead bend can not be corrected when the deviation is corrected, the drill jamming phenomenon and the pipe freezing phenomenon which is difficult to put down are prevented when the lifting and drilling tool is put down;
seventhly, when the two holes deflect oppositely and the danger of pipe penetration exists, the deflection condition is strictly monitored, and timely correction is carried out to prevent the pipe penetration;
after drilling a final hole, carrying out hole sweeping and reaming for many times, increasing the smoothness of the drilled hole, eliminating the influence of a deflecting section on the lower pipe construction, and ensuring the smooth lowering of the freezing pipe;
ninthly, carrying out technical training on the worker participating in the directional construction, enabling the worker to be familiar with the directional construction method, and ensuring the smooth proceeding of the directional construction.
Claims (10)
1. The S-shaped directional freezing drilling construction process for well wall repair is characterized by comprising the following steps of:
A. a group of upper vertical non-freezing holes (2) are arranged on the periphery of the ground derrick foundation (1);
B. a middle deflecting non-freezing hole (3) communicated with each upper vertical non-freezing hole (2) is arranged below each upper vertical non-freezing hole, and the distance from the axis of the middle deflecting non-freezing hole (3) to the axis of the shaft (4) is gradually reduced from top to bottom;
C. a lower vertical non-freezing hole (5) communicated with each middle deflecting non-freezing hole (3) is arranged below each middle deflecting non-freezing hole, and the lower end face of each lower vertical non-freezing hole (5) is positioned above the shaft repairing section (6);
D. a lower vertical freezing hole (8) communicated with each lower vertical non-freezing hole (5) is arranged below each lower vertical non-freezing hole, and the lower end surface of each lower vertical freezing hole (8) is positioned below the shaft repairing section (6);
E. at least two first temperature measuring holes (11) are arranged on the periphery of the ground well tower foundation (1), the lower end faces of the first temperature measuring holes (11) are flush with or positioned below the lower end face of the upper vertical non-freezing hole (2), and at least two second temperature measuring holes (13) are arranged on the outer sides of the lower vertical freezing holes (8);
F. a group of temperature control holes (12) are arranged between a derrick foundation (1) on the ground and the vertical non-freezing hole (2) at the upper part, and the lower end faces of the temperature control holes (12) are positioned below the derrick foundation (1).
2. The borehole wall repairing S-shaped directional freezing drilling construction process according to claim 1, characterized in that in the step A, the horizontal distance between the axis of the upper vertical non-freezing hole (2) and the derrick foundation (1) is 2.3-2.7 m.
3. The borehole wall repairing S-shaped directional freezing drilling construction process according to claim 1, characterized in that in the step A, the lower end face of the upper vertical non-freezing hole (2) is positioned below the lower end face of the derrick foundation (1).
4. The borehole wall repairing S-shaped directional freezing drilling construction process according to claim 1, wherein in the step B, the parameter setting of the middle deflecting unfrozen hole (3) comprises the following steps:
b1, calculating the height H of the middle deflecting unfrozen hole: measuring H0, H1, H2 and H3, wherein the total hole depth is H0, the height of the upper vertical non-freezing hole (2), the height of the lower vertical non-freezing hole (5) and the height of the lower vertical freezing hole (8) are respectively H3, and H is H0-H1-H2-H3;
b2, calculating the horizontal displacement L of the middle deflecting non-freezing hole: measuring a horizontal distance from the axis of the upper vertical non-freezing hole (2) to the axis of the lower vertical non-freezing hole (5), wherein the horizontal distance is L;
b3, measuring the deviation azimuth angle alpha of the drilling hole: measuring an included angle between the axial line connecting line of the upper vertical non-freezing hole (2) and the lower vertical freezing hole (8) and the due north direction, namely alpha;
b4, determining the minimum curvature radius R of the deflecting section: determining the minimum curvature radius R according to the design diameters, wall thicknesses and structures of drilling tools and freezing pipes selected for drilling, and taking the minimum curvature radius when the same drilling hole consists of the drilling tools and the freezing pipes with different specifications;
b5, determining the height h of the deflecting section: setting horizontal displacement of a deflecting section to be L, wherein a middle deflecting non-freezing hole (3) comprises an upper deflecting increasing section (3-1) and a lower deflecting reducing section (3-2) which are arc-shaped, the middle of the upper deflecting increasing section (3-1) is bent towards the direction far away from a shaft (4), the middle of the lower deflecting reducing section (3-2) is bent towards the shaft (4), the curvature radiuses of the upper deflecting increasing section (3-1) and the lower deflecting reducing section (3-2) are equal to each other and are R, the horizontal displacement is equal to L/2, and then the section height h is (4 RL-L) 2 ) 1/2 ，
When the height H of the middle deflecting non-freezing hole (3) is greater than the calculated height H of the deflecting section, firstly constructing the deflecting section with the upper height H, and constructing the rest part with the height (H-H) according to the index of the lower vertical non-freezing hole (5);
when the height H of the middle deflecting non-freezing hole (3) is less than the calculated deflecting segment height H, the segment height formula H is (4 RL-L) 2 ) 1/2 The method is characterized in that the diameter and the wall thickness of a freezing pipe are reduced on the premise of ensuring the flow rate of brine and the construction safety, namely, the minimum curvature radius R of an oblique section is reduced, if the diameter and the wall thickness of the freezing pipe can not be adjusted through checking and calculating or the requirement can not be met after the adjustment, the radius of all lower vertical freezing holes (8) is increased, namely, the horizontal displacement L of the middle oblique non-freezing holes (3) is reduced, the adjustment is carried out until H is equal to H, and if the distance between the lower vertical freezing holes (8) can not meet the design requirement after the radius of all lower vertical freezing holes (8) is increased, the problem is solved by increasing the number of the lower vertical freezing holes (8).
5. The borehole wall repairing S-shaped directional freezing drilling construction process according to claim 1, wherein in the step D, the distance between the axes of two adjacent lower vertical freezing holes (8) is less than or equal to 2.0 m.
6. The borehole wall repairing S-shaped directional freezing drilling construction process according to claim 1, wherein in the step D, the height of the lower water-proof section (10) is greater than or equal to 10.0 m.
7. The borehole wall repairing S-shaped directional freezing drilling construction process according to the claim 1, wherein in the step D, the part of the borehole inside the lower vertical non-freezing hole (5) is a protective section (7) of the borehole repairing section (6), the part of the borehole inside the lower vertical freezing hole (8) and between the borehole repairing section (6) and the protective section (7) is an upper water-proof section (9) of the borehole repairing section (6), and the part of the borehole inside the lower vertical freezing hole (8) and below the borehole repairing section (6) is a lower water-proof section (10) of the borehole repairing section (6).
8. The borehole wall repairing S-shaped directional freezing drilling construction process according to the claim 1, characterized in that in the step E, the horizontal distance between the axis of the first temperature measuring hole (11) and the derrick foundation (1) is equal to the horizontal distance between the axis of the upper vertical non-freezing hole (2) and the derrick foundation (1), and the distances between the axes of all the second temperature measuring holes (13) and the axis of the borehole (4) are equal.
9. The borehole wall repairing S-shaped directional freezing drilling construction process according to claim 1, wherein in the step F, the height difference between the lower end face of the temperature control hole (12) and the lower end face of the derrick foundation (1) is greater than or equal to 2.0m, and the height difference between the lower end face of the upper vertical non-freezing hole (2) and the lower end face of the temperature control hole (12) is 1.0 m.
10. The borehole wall repairing S-shaped directional freezing drilling construction process according to claim 1, wherein in the step F, the horizontal distance between the axis of each temperature control hole (12) and the derrick foundation (1) is 0.4-0.6m, the lower end faces of the temperature control holes (12) are located above the middle deflecting non-freezing holes (3), and the distance between the axes of every two adjacent temperature control holes (12) is less than or equal to 3.5 m.
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| CN112942306A (en) * | 2021-02-05 | 2021-06-11 | 中煤第五建设有限公司 | Freezing method for large foundation pit |
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| RU2133323C1 (en) * | 1997-07-16 | 1999-07-20 | Научно-производственная компания "Техника и организация бурения скважин" (НПК ТОБУС) | Method for deviation of bore-hole by means of pivoted whipstock |
| CN101694159A (en) * | 2009-10-22 | 2010-04-14 | 中煤第一建设公司第四十九工程处 | Technology for rapidly constructing air shaft under chill condition and process for sinking vertical shaft pit shaft |
| US20180230751A1 (en) * | 2017-02-13 | 2018-08-16 | Saudi Arabian Oil Company | Drilling and Operating Sigmoid-Shaped Wells |
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