CN115030688B - S-shaped directional freezing drilling construction process for well wall repair - Google Patents
S-shaped directional freezing drilling construction process for well wall repair Download PDFInfo
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- CN115030688B CN115030688B CN202210857226.8A CN202210857226A CN115030688B CN 115030688 B CN115030688 B CN 115030688B CN 202210857226 A CN202210857226 A CN 202210857226A CN 115030688 B CN115030688 B CN 115030688B
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- 230000008014 freezing Effects 0.000 title claims abstract description 215
- 238000007710 freezing Methods 0.000 title claims abstract description 215
- 238000005553 drilling Methods 0.000 title claims abstract description 66
- 238000010276 construction Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 238000013461 design Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 8
- 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
- 230000003247 decreasing effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000012937 correction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement 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
- 238000012549 training Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
-
- 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
-
- 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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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
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Abstract
The invention relates to the technical field of well wall restoration, and provides an S-shaped directional freezing drilling construction process for well wall restoration, which comprises the following steps of: a group of upper vertical non-freezing holes are arranged on the periphery of the underground well tower 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 a well tower foundation on the ground, and at least two second temperature measuring holes are formed in the outer side of the vertical freezing hole at the lower part; a group of temperature control holes are arranged between a well tower foundation on the ground and the upper vertical non-freezing holes. The problems that in the related art, a well tower, a derrick and equipment and facilities which cannot be removed occupy the construction position of a conventional freezing hole, measures are required to be taken to prevent frost heaving from affecting the foundation of the well tower and the derrick, and time and labor are wasted are solved.
Description
Technical Field
The invention relates to the technical field of well wall restoration, in particular to a S-shaped directional freezing drilling construction process for well wall restoration.
Background
Because of stratum settlement and other reasons, the coal mine shaft with deep and thick overburden layers in Henan, anhui, shandong and the like is increased along with time in the use process, and the phenomenon of well wall rupture is greatly generated. 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, long-distance well wall repairing safety conditions, safety, quality, cost and construction period controllability, comprehensive technology and good economic benefit, and becomes the preferred technology for preventing water inrush and sand surge in well wall repairing.
However, the following difficulties exist in borehole wall repair freezing compared to conventional freezing: the well heads of the wellbores which are put into use are provided with auxiliary facilities such as a welltower, a derrick and various pipelines, channels and the like, and some facilities such as a transportation belt corridor and the like are difficult to dismantle, so that the welltower, the derrick and equipment facilities which cannot be dismantled occupy the construction positions of conventional freezing holes, measures are taken to prevent frost heaving from influencing the foundation of the welltower and the derrick, and time and labor are wasted.
Disclosure of Invention
The invention provides a construction process for repairing S-shaped directional freezing drilling holes on a well wall, which solves the problems that in the prior art, a well tower, a well frame and equipment and facilities which cannot be removed occupy the construction positions of conventional freezing holes, and measures are required to prevent frost heaving from affecting the foundation of the well tower and the well frame, so that time and labor are wasted.
The technical scheme of the invention is as follows: the construction process of S-shaped directional freezing drilling for repairing the well wall is characterized by comprising the following steps of:
A. a group of upper vertical non-freezing holes are arranged on the periphery of the underground well tower 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 the 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 well bore 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 face of each lower vertical freezing hole is positioned below the well bore repairing section;
E. at least two first temperature measuring holes are arranged on the periphery of a well tower foundation on the ground, the lower end surfaces of the first temperature measuring holes are flush with or below the lower end surfaces of the upper vertical non-freezing holes, and at least two second temperature measuring holes are arranged on the outer sides of the lower vertical freezing holes;
F. a group of temperature control holes are arranged between a well tower foundation on the ground and the upper vertical non-freezing holes, and the lower end surfaces of the temperature control holes are positioned below the well tower foundation.
In step A, the horizontal distance between the axis of the upper vertical non-freezing hole and the foundation of the well tower is 2.3-2.7m.
In the step A, the lower end face of the upper vertical non-freezing hole is positioned below the lower end face of the well tower foundation.
In step B, the parameter setting of the middle whipstock non-freezing hole includes:
b1, calculating the height H of the middle deflecting non-freezing hole: measuring the total hole depth as H0, the height of the upper vertical non-freezing holes as H1, the height of the lower vertical non-freezing holes as H2 and the height of the lower vertical freezing holes as H3 on a drilling track section schematic diagram, and then obtaining H=H2-H0-H1-H2-H3;
b2, calculating the horizontal displacement L of the middle deflecting non-freezing hole: measuring the horizontal distance between the axis of the upper vertical non-freezing hole and the axis of the lower vertical non-freezing hole on the drilling hole distribution plane schematic diagram to obtain L;
b3, measuring a drilling deflection azimuth angle alpha: measuring an included angle between the axis connecting line of the upper vertical non-freezing hole and the lower vertical freezing hole and the north direction, namely alpha;
b4, determining the minimum curvature radius R of the deflecting section: determining a minimum curvature radius R according to the design diameter, the wall thickness and the structure of a drilling tool and a freezing pipe selected for drilling, wherein the minimum curvature radius is taken when the same drilling tool consists of drilling tools with different specifications and the freezing pipe;
b5, determining a deflecting section Duan Gao h: setting the horizontal displacement of the deflecting section as L, wherein the middle deflecting non-freezing hole comprises an arc-shaped upper inclination increasing section and a lower inclination decreasing section, the middle part of the upper inclination increasing section is bent in the direction away from the shaft, the middle part of the lower inclination increasing section is bent in the direction towards the shaft, the curvature radiuses of the upper inclination increasing section and the lower inclination decreasing section are equal to R, the horizontal displacement is equal to L/2, and then the section height h= (4 RL-L) 2 ) 1/2 ，
When the height H of the middle deflecting non-freezing hole is larger than the calculated deflecting section Duan Gao H, firstly constructing the deflecting section with the height H above, 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 whipped non-frozen hole H is less than the calculated whipped segment Duan Gao H, according to segment Gao Gongshi h= (4 RL-L 2 ) 1/2 On the premise of ensuring the brine flow and construction safety, the minimum curvature radius R of the deflecting section is reduced by reducing the diameter and the wall thickness of the freezing pipe, if the diameter and the wall thickness of the freezing pipe cannot be adjusted or are still not required after adjustment through checking, the diameter of all lower vertical freezing holes is adjusted by increasing the radius of the deflecting non-freezing holes, namely reducing the horizontal displacement L of the deflecting non-freezing holes, until h=H, and if the spacing of the lower vertical freezing holes does not meet the design requirement after the radius of all lower vertical freezing holes is increased, the number of the lower vertical freezing holes is increased.
In the step D, the distance between the axes of two adjacent lower vertical freezing holes is less than or equal to 2.0m.
In the step D, the height of the lower water isolation section is more than or equal to 10.0m.
In the step D, a shaft part positioned at the inner side of the lower vertical non-freezing hole is a protection section of a shaft restoration section, a shaft part positioned at the inner side of the lower vertical freezing hole and positioned between the shaft restoration section and the protection section is an upper water isolation section of the shaft restoration section, and a shaft part positioned at the inner side of the lower vertical freezing hole and positioned below the shaft restoration section is a lower water isolation section of the shaft restoration section.
In the step E, the horizontal distance between the axes of the first temperature measuring holes and the shaft tower foundation is equal to the horizontal distance between the axes of the upper vertical non-freezing holes and the shaft tower foundation, and the distances between the axes of all the second temperature measuring holes and the shaft axis are equal.
In the step F, the height difference between the lower end face of the temperature control hole and the lower end face of the well tower foundation is more than or equal to 2.0m, and 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 is 1.0m.
In the step F, the horizontal distance between the axis of the temperature control hole and the foundation of the well tower is 0.4-0.6m, the lower end face of the 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 3.5m.
The working principle and the beneficial effects of the invention are as follows: the periphery of the underground well tower foundation is provided with a group of upper vertical non-freezing holes, a middle deflecting non-freezing hole communicated with the upper vertical non-freezing holes is arranged below each upper vertical non-freezing hole, the distance between the axis of the middle deflecting non-freezing hole and 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 first temperature measuring hole and the second temperature measuring hole are utilized to detect the ambient temperature in real time, the temperature control hole is utilized to timely adjust the ambient temperature, so that the lower vertical freezing hole can avoid equipment and facilities which cannot be dismantled from the ground, local freezing is realized, the problem that the conventional freezing hole is occupied by the conventional well tower, the well frame and the equipment and facilities which cannot be dismantled from the well tower and the well frame can be successfully solved, measures are taken to prevent the influence of frost heaving on the foundation of the well tower and the well frame, the problems of time and labor waste are solved, simultaneously, the drilling engineering quantity and the freezing refrigerating quantity can be greatly saved, the freezing period is shortened, and the freezing effect can be ensured.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic plan view of a drilling cloth hole in the present invention
FIG. 2 is a schematic 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 middle whipped non-frozen hole according to the present invention.
In the figure: 1. the well tower foundation comprises 2, an upper vertical non-freezing hole, 3, a middle deflecting non-freezing hole, 3-1, an upper tilting increasing section, 3-2, a lower tilting decreasing section, 4, a well shaft, 5, a lower vertical non-freezing hole, 6, a well shaft repairing section, 7, a protecting section, 8, a lower vertical freezing hole, 9, an upper water isolation section, 10, a lower water isolation section, 11, a first temperature measuring hole, 12, a temperature control hole, 13, a second temperature measuring hole, 14 and a third temperature measuring hole.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments of the present invention, are intended to be encompassed within the scope of the present invention.
The specific embodiment relates to a construction process for S-shaped directional freezing drilling for well wall repair, which comprises the following steps:
A. a group of upper vertical non-freezing holes 2 are arranged on the periphery of the underground shaft tower foundation 1, the lower end face of each upper vertical non-freezing hole 2 is positioned below the lower end face of the corresponding shaft tower foundation 1, the horizontal distance between the axis of each upper vertical non-freezing hole 2 and the shaft tower 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 shaft tower foundation 1 is preferably 2.5m according to the size of the shaft tower foundation 1 of the main shaft and the specific situation on site so as to prevent frost heaving from affecting the shaft tower foundation 1;
the number of the upper vertical non-freezing holes 2 is determined according to the wall diameter of the well bore repairing section 6, the design thickness of the 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 the first temperature measuring holes 11 are uniformly arranged on the periphery of the 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. setting a middle deflecting non-freezing hole 3 communicated with each upper vertical non-freezing hole 2, wherein the distance between the axis of the middle deflecting non-freezing hole 3 and the axis of a shaft 4 is gradually reduced from top to bottom, and the parameter setting of the middle deflecting non-freezing hole 3 comprises:
b1, calculating the height H of the middle deflecting non-freezing hole: measuring the total hole depth (namely the distance between the lower end surface of the lower vertical freezing hole and the ground) from the drilling track section schematic diagram 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, wherein H=H20-H1-H2-H3;
b2, calculating the horizontal displacement L of the middle deflecting non-freezing hole: measuring the axis of the upper vertical non-freezing holes 2 to the axis of the lower vertical non-freezing holes 5 on the drilling hole distribution plan schematic diagram
The horizontal spacing of (2) is L;
b3, measuring a drilling deflection azimuth angle alpha: measuring an included angle between the axis connecting line of the upper vertical non-freezing hole 2 and the lower vertical freezing hole 8 and the north direction, namely alpha, knowing the position of the hole, and knowing the direction deflection (the included angle with the north clockwise) of 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 can be constructed according to the designed deflection amount;
b4, determining the minimum curvature radius R of the deflecting section: determining a minimum curvature radius R according to the design diameter, the wall thickness and the structure of a drilling tool and a freezing pipe selected for drilling, wherein the minimum curvature radius R=215.0m is taken when the same drilling tool consists of drilling tools with different specifications and the freezing pipe;
b5, determining a deflecting section Duan Gao h: setting the horizontal displacement of the deflecting section as L, wherein the middle deflecting non-freezing hole 3 comprises an arc-shaped upper tilting-increasing section 3-1 and a lower tilting-decreasing section 3-2The middle part of the upper inclination increasing section 3-1 is bent towards the direction away from the shaft 4, the middle part of the lower inclination decreasing section 3-2 is bent towards the shaft 4, the curvature radiuses of the upper inclination increasing section 3-1 and the lower inclination decreasing section 3-2 are equal to each other and R, the horizontal displacement is equal to each other and L/2, and then the section height h= (4 RL-L) 2 ) 1/2 ，
When the height H of the middle deflecting non-freezing hole 3 is larger than the calculated deflecting section Duan Gao H, firstly constructing the deflecting section with the height H above, 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 whipped non-frozen hole 3 is less than the calculated whipped segment Duan Gao H, according to segment Gao Gongshi h= (4 RL-L 2 ) 1/2 On the premise of ensuring the brine flow and construction safety, the minimum curvature radius R of the deflecting section is reduced by reducing the diameter and the wall thickness of the freezing pipe, if the diameter and the wall thickness of the freezing pipe cannot be adjusted or are still not required after adjustment through checking, the diameter and the wall thickness of all the lower vertical freezing holes 8 are adjusted by increasing the radius of the lower vertical freezing holes, namely reducing the horizontal displacement L of the middle deflecting non-freezing holes 3 until h=H, and if the distance between the lower vertical freezing holes 8 does not meet the design requirement after the radius of all the lower vertical freezing holes 8 are increased, the number of the lower vertical freezing holes 8 is increased;
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 surface of each lower vertical non-freezing hole 5 is positioned above a 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 freezing hole 5, a shaft hole part positioned below a shaft hole repairing section 6 and at the inner side of the lower vertical non-freezing hole 5 is a protection section 7 of the shaft hole repairing section 6, a shaft hole part positioned at the inner side of the lower vertical freezing hole 8 and positioned between the shaft hole repairing section 6 and the protection section 7 is an upper water-proof section 9 of the shaft hole repairing section 6, a shaft hole part positioned at the inner side of the lower vertical freezing hole 8 and positioned below the shaft hole repairing section 6 is a lower water-proof section 10 of the shaft hole repairing section 6, wherein the distance between the axes of two adjacent lower vertical freezing holes 8 is less than or equal to 2.0m, and the height of the lower water-proof section 10 is more than or equal to 10.0m;
E. at least two first temperature measuring holes 11 are formed in the periphery of the underground shaft tower foundation 1, the lower end faces of the first temperature measuring holes 11 are flush with or below the lower end faces of the upper vertical non-freezing holes 2, at least two second temperature measuring holes 13 are formed in the outer side of the lower vertical freezing holes 8, the horizontal distance from the axes of the first temperature measuring holes 11 to the shaft tower foundation 1 is equal to the horizontal distance from the axes of the upper vertical non-freezing holes 2 to the shaft tower foundation 1, and the distances from the axes of all the second temperature measuring holes 13 to the shaft 4 are equal;
F. a group of temperature control holes 12 are arranged between a well tower foundation 1 and an upper vertical non-freezing hole 2 on the ground, the lower end face of the temperature control holes 12 is 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 is preferably 0.5m, the lower end face of the temperature control holes 12 is 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 face of the temperature control holes 12 and the lower end face of the well tower foundation 1 is more than or equal to 2.0m, 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 holes 12 is 1.0m, the hole number and the hole spacing of the temperature control holes 12 are determined according to cold amount exchange calculation, a third temperature measurement hole 14 is arranged between the temperature control holes 12 and the upper vertical non-freezing hole 2 and is used for measuring the temperature of the temperature control holes 12, as shown in a fourth temperature measurement hole 14 is arranged on the periphery of the rectangular well tower foundation 1.
In example 1, as shown in fig. 1 and 2, the inner diameter of the well bore 4 is 5.0m, the outer diameter is 8.2m, the well tower foundation 1 surrounds the periphery of the well bore 4, the lengths D of the outer wall of the well tower foundation 1 along the left-right direction and the front-back direction are 25.0m, the well tower door is positioned right in front of the well bore 4, the belt corridor is positioned right behind the well bore 4, 24 lower vertical freezing holes 8 are arranged on the periphery of the well bore 4, the interval between the axis of each lower vertical freezing hole 8 and the axis of the well bore 4 is 5.6m, three second temperature measuring holes 13 are arranged between the lower vertical freezing holes 8 and the well tower foundation 1, nine temperature control holes 12 and six upper vertical non-freezing holes 2 are simultaneously arranged in front of the well tower foundation 1, behind the well tower foundation 1, the distances between the axis of the upper vertical non-freezing holes 2 and the axis of the well bore 4 are 2.5m, the distances between the axis of the temperature control holes 12 and the axes of the well tower foundation 1 are respectively 1, and the distances between the front of the well tower foundation 1 and the tower foundation 1 are respectively 1, and the front of the tower foundation 1 is 11.5 m. 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 control hole 12 and the second temperature measuring hole 13 are all 0.6m.
In order to ensure that the drilling track is smooth and is beneficial to the lowering of a freezing pipe, the front half of the height h of a section is increased in inclination by adopting an inclination increasing drilling mode, namely, the section is increased in inclination according to the design curvature radius, the rear half of the section is adopted by adopting an inclination decreasing drilling mode, the drilling is ensured to be smoothly transited to the lower straight hole section according to the design curvature radius, the solid line section on the left side in FIG. 3 is a schematic diagram of the lower inclination decreasing section 3-2, the solid line section on the right side is a schematic diagram of the upper inclination increasing section 3-1, the curvature radiuses of the upper inclination increasing section 3-1 and the lower inclination decreasing section 3-2 are equal to R, the horizontal displacement is equal to L/2, the height displacement is equal to h/2, and R is equal to R 2 ＝(h/2) 2 +(R-L/2) 2 From this, it can be derived that h= (4 RL-L 2 ) 1/2 If the calculated height H of the middle deflecting non-freezing hole 3 is larger than the calculated deflecting section Duan Gao H, firstly constructing the deflecting section with the height H above, and constructing the rest part with the height H-H 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 holes, and the inclinometry equipment used by the middle deflecting non-freezing hole 3 during construction is as follows: adopting azimuth angle error less than or equal to +/-0.5 degrees; the error of the well bevel angle (0-70 degrees) is less than or equal to +/-0.05 degrees; a high-speed high-precision continuous gyro inclinometer system with tool face angle error less than or equal to +/-0.5 degrees; and determining the deflecting angle of the screw drilling tool according to the deflecting rate of the minimum curvature radius and the stratum hardness, ensuring that the deflecting capacity of the screw is slightly larger than the deflecting rate of the drilling design, increasing sliding drilling of the deflecting section as much as possible, and improving the construction efficiency. A screw drilling tool with diameter 146 of 1-degree of deflecting angle is selected as a normal deflecting screw, and the screw drilling tool with 1.5-degree of deflecting angle is used for coping with special situations such as large stratum inclination angle.
In order to ensure the deflecting effect and the construction efficiency, an inverted drilling tool combination is adopted, and a drilling tool combination is designed for bedrock: phi 216mm drill bit +146 screw drill + phi 73mm drill rod + phi 121mm drill collar + phi 121mm screw drill collar + phi 146mm drill collar + phi 121mm drill collar + phi 159mm screw drill collar + phi 73mm drill rod; the surface soil section drilling tool assembly is as follows: phi 216mm drill bit +146 screw drill + phi 73mm drill rod + phi 121mm screw drill collar. Fine tuning may be performed depending on the particular formation.
The deflecting section of each drilling hole is constructed by adopting a directional instrument and a screw drill to cooperate with deflecting, and in order to improve deflecting effect, the deflecting drilling section adopts sliding drilling, and the stable drilling adopts a composite drilling mode; the stratum deviation correcting effect is provided through continuous summarization of construction, the drilling tool assembly and screw drill deviation angles are adjusted, and the construction efficiency of the deviation section is improved.
And (3) drilling and inclinometry are timely carried out after the construction of the deflecting section for 9m (a drill rod), whether the vertex angle and the azimuth of the drilling are in accordance with the construction requirements is analyzed and judged, and if so, drilling is continued. If the vertex angle and the azimuth of the drilling hole after the inclinometry do not meet the expectations, artificial directional construction is carried out through a directional instrument and a screw drill. When the actual apex angle of the drilling hole is larger than the requirement of the deflecting apex angle, the apex angle construction is reduced by the screw drill so as to inhibit the development speed of the drilling hole; otherwise, the apex angle construction is increased through the screw drill, so that the development speed of the screw drill is improved. And adjusting the azimuth of the drilling hole while adjusting the top angle, and repeating the construction process until the deflection of the drilling hole meets the design requirement.
In order to better ensure the directional drilling quality, the following measures are taken:
(1) establishing a directional special management group consisting of related personnel, and ensuring the smooth implementation of directional construction;
(2) the inclinometry and orientation equipment is the key point of the whole orientation construction, and an electrical measuring person pays attention to performance parameters of the inclinometry and orientation equipment at all times, and checks the equipment in time to ensure the equipment precision;
(3) the inclinometry data is checked by drawing in time, and technicians predict the development trend of drilling in time;
(4) the reasonable inclination measuring section height is determined according to the drilling deviation condition by taking less duty measurement as a principle, and the inclination correction is performed in time once the drilling track is out of limit;
(5) the length of the machine needs to operate in person during directional correction drilling, so that the correction effect is ensured;
(6) when the inclination is corrected, the sharp bend and dead bend cannot be corrected, so that the phenomenon of drill sticking during lifting and drilling tools descending and the phenomenon of difficult pipe freezing during descending are prevented;
(7) when the two holes are inclined oppositely and the pipe penetrating danger exists, the inclined condition is closely monitored, and timely deviation correction is performed to prevent pipe penetrating;
(8) after the hole is drilled, the hole is scanned and perforated for many times, so that the smoothness of the drilled hole is increased, the influence of the deflecting section on the construction of the lower pipe is eliminated, and the smooth lowering of the frozen pipe is ensured;
(9) the staff participating in directional construction is subjected to technical training, so that the staff is familiar with the directional construction method, and the smooth implementation of the directional construction is ensured.
Claims (9)
1. The construction process of the S-shaped directional freezing drilling hole for repairing the well wall 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 underground well tower 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 between the axis of the middle deflecting non-freezing hole (3) and 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 a 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 face of each lower vertical freezing hole (8) is positioned below the well bore repairing section (6);
E. at least two first temperature measuring holes (11) are formed in the periphery of the underground well tower foundation (1), the lower end face of each first temperature measuring hole (11) is flush with or below the lower end face of the corresponding upper vertical non-freezing hole (2), and at least two second temperature measuring holes (13) are formed in the outer side of each lower vertical freezing hole (8);
F. a group of temperature control holes (12) are arranged between a well tower foundation (1) on the ground and an upper vertical non-freezing hole (2), and the lower end surface of the temperature control holes (12) is positioned below the well tower foundation (1);
in step B, the parameter setting of the middle deflecting non-freezing hole (3) comprises the following steps:
b1, calculating the height H of the middle deflecting non-freezing hole: measuring the total hole depth as H0, the height of the upper vertical non-freezing holes (2) as H1, the height of the lower vertical non-freezing holes (5) as H2 and the height of the lower vertical freezing holes (8) as H3, and then H=H20-H1-H2-H3;
b2, calculating the horizontal displacement L of the middle deflecting non-freezing hole: measuring the horizontal distance between the axis of the upper vertical non-freezing hole (2) and the axis of the lower vertical non-freezing hole (5), namely L;
b3, measuring a drilling deflection azimuth angle alpha: measuring an included angle between the axis connecting line of the upper vertical non-freezing hole (2) and the lower vertical freezing hole (8) and the north direction, namely alpha;
b4, determining the minimum curvature radius R of the deflecting section: determining a minimum curvature radius R according to the design diameter, the wall thickness and the structure of a drilling tool and a freezing pipe selected for drilling, wherein the minimum curvature radius is taken when the same drilling tool consists of drilling tools with different specifications and the freezing pipe;
b5, determining a deflecting section Duan Gao h: setting the horizontal displacement of a deflecting section as L, wherein the middle deflecting non-freezing hole (3) comprises an arc-shaped upper tilting section (3-1) and a lower tilting section (3-2), the middle part of the upper tilting section (3-1) is bent in a direction away from a shaft (4), the middle part of the lower tilting section (3-2) is bent towards the shaft (4), the curvature radiuses of the upper tilting section (3-1) and the lower tilting section (3-2) are equal to R, the horizontal displacement is equal to L/2, and then the section height h= (4 RL-L) 2 ） 1/2 ，
When the height H of the middle deflecting non-freezing hole (3) is larger than the calculated deflecting section Duan Gao H, firstly constructing the deflecting section with the height H above, and constructing the rest part with the height (H-H) according to the index of the lower vertical non-freezing hole (5);
height of non-frozen hole (3) when middle part is inclinedH is less than the calculated whip leg Duan Gao H, according to leg Gao Gongshi h= (4 RL-L) 2 ） 1/2 On the premise of ensuring the brine flow and the construction safety, the minimum curvature radius R of the deflecting section is reduced by reducing the diameter and the wall thickness of the freezing pipe, if the diameter and the wall thickness of the freezing pipe cannot be adjusted or are still not required after adjustment through checking, the adjustment is carried out by increasing the radius of all the lower vertical freezing holes (8), namely reducing the horizontal displacement L of the middle deflecting non-freezing holes (3), until h=H, and if the distance between the lower vertical freezing holes (8) does not meet the design requirement after the radius of all the lower vertical freezing holes (8) is increased, the problem is solved by increasing the number of the lower vertical freezing holes (8).
2. The construction process for repairing S-shaped directional frozen drilling holes on a well wall according to claim 1, wherein in the step A, the horizontal distance between the axis of the upper vertical non-frozen hole (2) and the foundation (1) of the well tower is 2.3-2.7m.
3. The construction process for repairing the S-shaped directional freezing drilling holes by the well wall according to claim 1, wherein 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 well tower foundation (1).
4. The construction process of S-shaped directional freezing drilling for well wall restoration 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 2.0m.
5. The construction process for repairing an S-shaped directional frozen borehole wall according to claim 1, wherein in the step D, the height of the lower water isolation section (10) is more than or equal to 10.0m.
6. The construction process for repairing an S-shaped directional frozen borehole of a well wall according to claim 1, wherein in the step D, a shaft part positioned inside a lower vertical non-frozen hole (5) is a protection part (7) of a shaft repairing part (6), a shaft part positioned inside the lower vertical frozen hole (8) and positioned between the shaft repairing part (6) and the protection part (7) is an upper water isolation part (9) of the shaft repairing part (6), and a shaft part positioned inside the lower vertical frozen hole (8) and positioned below the shaft repairing part (6) is a lower water isolation part (10) of the shaft repairing part (6).
7. A borehole wall repair S-shaped directional freezing borehole construction process according to claim 1, characterized in that in step E, the horizontal distance from the axis of the first temperature measuring hole (11) to the borehole tower foundation (1) is equal to the horizontal distance from the axis of the upper vertical non-freezing hole (2) to the borehole tower foundation (1), and the distances from the axis of all the second temperature measuring holes (13) to the axis of the borehole (4) are equal.
8. The construction process for repairing S-shaped directional frozen drilling holes on a well wall 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 well tower foundation (1) is more than or equal to 2.0m, and the height difference between the lower end face of the upper vertical non-frozen hole (2) and the lower end face of the temperature control hole (12) is 1.0m.
9. The construction process for repairing S-shaped directional frozen drilling holes by using a well wall according to claim 1, wherein in the step F, the horizontal distance between the axis of each temperature control hole (12) and the well tower foundation (1) is 0.4-0.6m, the lower end face of each temperature control hole (12) is positioned above the middle deflecting non-frozen hole (3), and the distance between the axes of two adjacent temperature control holes (12) is less than or equal to 3.5m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10184297B2 (en) * | 2017-02-13 | 2019-01-22 | Saudi Arabian Oil Company | Drilling and operating sigmoid-shaped wells |
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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 |
| 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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