CN111411909A - Artificial wall building method for treating drilling engineering in coal mining subsidence area - Google Patents
Artificial wall building method for treating drilling engineering in coal mining subsidence area Download PDFInfo
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- CN111411909A CN111411909A CN202010325215.6A CN202010325215A CN111411909A CN 111411909 A CN111411909 A CN 111411909A CN 202010325215 A CN202010325215 A CN 202010325215A CN 111411909 A CN111411909 A CN 111411909A
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- 238000005553 drilling Methods 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000003245 coal Substances 0.000 title claims abstract description 26
- 238000005065 mining Methods 0.000 title claims abstract description 20
- 239000012530 fluid Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 11
- 239000011398 Portland cement Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 3
- 230000002706 hydrostatic effect Effects 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 239000003469 silicate cement Substances 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 239000002689 soil Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007728 cost analysis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 208000008918 voyeurism Diseases 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B7/00—Special methods or apparatus for drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses an artificial wall building method for treating drilling engineering in a coal mining subsidence area, which comprises the steps of adopting a drilling machine and a drill bit to carry out primary open hole drilling on a fourth system covering layer of the subsidence area, putting a surface soil casing pipe in the hole, replacing the drill bit to carry out secondary continuous drilling, putting a drill rod to the bottom of a well after the drilling operation is finished, firstly circulating for more than 2 weeks by using a dilute drilling fluid with a large pump amount, controlling the viscosity of the drilling fluid in the well within 19s to ensure the stability of the artificial wall building, adopting cement paste to carry out grouting by using cement paste, carrying out artificial wall building on an open hole section, reinforcing simple hydrological observation in the drilling process after the artificial wall building is finished, effectively reducing buried and stuck drilling accidents, improving the drilling efficiency, solving the difficult problems of drilling with low hardness, poor cementation, easy loosening and serious leakage loss, and easy collapse of a stratum in a coal mining area, and enabling the upper part of a drilling well to, The diameter shrinkage and water burst stratum are controlled, and the time for upper through holes is saved by successfully grouting through water injection.
Description
Technical Field
The invention relates to the technical field of coal mine treatment, in particular to an artificial wall building method for treating drilling engineering in a coal mining subsidence area.
Background
The coal mine subsidence area is characterized in that ores, coal and the like encountered in the mining process are conveyed to the ground in the coal mine operation process so as to form a reasonable conveying and mining operation surface, and the coal goaf is formed underground along with the continuous conveying of the coal and other ores.
Generally, a coal mine goaf remained after coal mining operation is finished continues to be exploited in depth if necessary, a subsidence area is moderately reinforced generally, protective measures such as anchor rod fixing and wood pile supporting are adopted, the coal mine subsidence area cannot collapse in a short time, if the subsidence area is not reinforced and backfilled, the subsidence area is gradually formed and stably sinks 3-5 years after the goaf is mined out, the original geological environment and the original landform and landform are gradually changed, the man-ground spear shield is aggravated along with the acceleration of the industrialization and urbanization process, the restriction bottleneck of land resources on the social development is increasingly prominent, and the mine land collapse is aggravated.
At present, the later stage reinforcement of a subsidence area mostly adopts a grouting method, a grouting wellhead adopts pressure process grouting, low-density cement grout at the earlier stage erodes and destroys a well wall, a grouting channel is blocked and bridged by falling mud skin and the collapsed well wall, a drilling team needs to carry out hole throwing, the collapsed and fallen mud skin blocks are treated, small particles adopt a clear water drilling pump circulation carrying method, large particles adopt a thick drilling fluid drilling pump circulation carrying method (matched with a sand fishing pipe), and a bridging point is thrown through to plug the upper part of the next bridging point by cement grout.
285-298 m, 310-331 m and 355-362 m three sections of mudstone and sandy mudstone strata in the well, the well wall is relatively stable under the condition that drilling fluid exists in the well, the well wall collapses and falls to influence wellhead pressure grouting when the well is replaced by clear water in the well, and the 300-310 m sections of sandstone sections are known to gush water into the hole along the fracture by using a peeping method to continuously scour the lower well wall. Repeated hole throwing and cement plugging of the well drilling increase the construction time and cost.
Disclosure of Invention
The invention aims to provide a method for artificially constructing a wall in a coal mining subsidence area treatment drilling engineering, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for artificially building walls in a coal mining subsidence area treatment drilling engineering comprises the following steps:
s1, drilling a hole for the first time on the fourth series covering layer of the subsidence area by using a drill machine matched with a drill bit, wherein the drilling depth is 274 m;
s2, replacing the drill bit to perform secondary drilling on the basis of the primary hole opening, and selecting a reasonable position to complete the secondary drilling;
s3, after the second drilling is finished, a drill rod is put into the bottom of the hole, and a drilling machine liquid pump is adopted to circulate for more than two weeks by using a large pump volume of dilute drilling fluid;
s4, carrying out artificial wall building on the lower open hole section by using portland cement;
and S5, after the artificial wall is built, the simple hydrological observation is enhanced in the drilling process.
Preferably, the specific step of step S1 includes: the drilling machine adopts a phi 133mm coreless drill bit, a phi 68mm drill collar 80m, a phi 50mm drill rod and a phi 89mm hexagonal active drill rod to cooperate for drilling a first open hole, the aperture of the drilling of the first open hole is 133mm, and after the drilling is finished, a 127mm casing pipe is placed in the first open hole for cementing.
Preferably, the drilling machine for the second drilling process adopts a phi 94mm coreless drill bit, a phi 68mm drill collar 65m, a phi 50mm drill rod and a phi 89mm hexagonal active drill rod to be matched on the basis of the first drilling, the second drilling is performed, the aperture of the second drilling is 94mm, and the drilling machine drills to 470m according to the principle that the drilling depth is deepened as much as possible in two zones (a water-guiding fractured zone and an caving zone) of an un-drilled subsidence zone in consideration of the consumption condition of drilling fluid, the hydrostatic level, the water-guiding fractured zone and the like.
Preferably, in the step S3, the drill pipe is a phi 50mm drill pipe, and the viscosity of the drilling fluid in the hole is controlled within 19S by using an inner pipe inserting method.
Preferably, the concrete step of step S4 includes performing artificial wall building on the lower open hole section by using PO42.5 type portland cement (with 2% to 3% of water glass added), tripping to the casing position of the first opening and reserving 10m of cement plug, circulating the rest to the ground by using a drilling pump, connecting the casing of the first opening by using the drilling pump, boosting the pressure to 2MPa by using clean water, after waiting for setting for 48 hours, putting into the hole by using a Φ 94mm pdc core-less drill bit and a Φ 68mm drill collar 80m to 470m, and observing the consumption condition by using the circulating drilling fluid.
Preferably, the hydrological observations include: the drilling speed is recorded every 0.5m within the range of 30m above the top plate of the goaf, the drilling speed is accurately recorded every 2m in the drilling process. And (3) predicting the beginning of entering a goaf fracture zone, recording the drilling speed, the drilling water level, the drill sticking, the drill burying, the drill falling, the rock core crushing and the air suction condition in detail, and judging the two-zone development condition of the goaf of the main coal mining layer.
Compared with the prior art, the invention has the beneficial effects that:
the drilling technology is reformed, the artificial wall-building technology enables the stratum which is easy to collapse, reduce diameter and gush water at the upper part of the well to be controlled, and the water injection and mud jacking are successful, so that the time for the upper part through hole is saved. The drill bit with the diameter of 94mm and the drill rod with the diameter of 50mm quickly drill through the caving zone and the goaf, and the traditional process of drill collars with the diameter of 94mm and the diameter of 68mm is abandoned, so that the accidents of burying and sticking can be effectively reduced. Through the reform to the probing technique, probing efficiency obtains promoting, and probing safety has obtained relative guarantee.
Drawings
FIG. 1 is a diagram of a drilling condition of a subsidence area of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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 fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a method for artificially building walls in a coal mining subsidence area treatment drilling engineering comprises the following steps:
the drilling machine is matched with a drill bit to perform primary drilling on the ground of the subsidence area, the drilling depth is 274M, the model of the drilling pump is BW300/16 drilling pump, the pump is simple, flexible and convenient to operate and can realize short-distance or remote control operation, the drilling machine adopts a phi 133mm coreless drill bit, a phi 68mm drill collar 80M, a phi 50mm drill rod and a phi 89mm hexagonal active drill rod to perform primary drilling, the aperture of the primary drilling is phi 133mm, 127mm casing cement is placed in the primary drilling hole for well cementation after the drilling is finished, a casing bottom opening is located on complete bedrock, cement slurry bottom-hole slurry return method is adopted to perform well cementation, the well cementation is performed to the ground, the quality of the casing and the first casing is checked by adopting an in-casing liquid level observation method, and the liquid level is checked to meet the design requirement, and secondary drilling is performed;
replacing a drill bit to drill holes for the second time on the basis of the first hole drilling, wherein the drilling depth is 274-470M, the drilling machine adopts a phi 94mm coreless drill bit, a phi 68mm drill collar x 65M, a phi 50mm drill rod and a phi 89mm hexagonal active drill rod to be matched on the basis of the first hole drilling to drill holes for the second time, the aperture of the second hole is 94mm, the hole is drilled to 470M, the viscosity of drilling fluid in the hole is controlled within 19S, after the second drilling is finished, the drill rod is put to the bottom of the hole, a drilling fluid pump is adopted to circulate for more than two weeks by using the dilute large pump amount of the drilling fluid, a coarse dispersion drilling fluid protective wall prepared from Na2CO3+ potassium humate (KHm) + bentonite is adopted in a loose layer in the drilling process, the performance requirement is that the funnel viscosity is 21-23S, the water amount is not more than 15M L/30 min, the PH value is 8-9, and the density is 1.08-1.10 g/cm 3;
the drilling fluid passes through a loose layer and enters a bedrock, and the wall is protected by using a non-dispersible low solid phase drilling fluid prepared from a GSP broad spectrum wall protecting agent, Na2CO3, KHm and bentonite, wherein the performance requirements of the wall are that the funnel viscosity is 20-24 s, the water loss is less than 12m L/30 min, the density is less than 1.08-1.10 g/cm3, and the pH value is 8-9;
the method comprises the steps of using Portland cement to carry out artificial wall building on a lower open hole section, specifically using PO42.5 type ordinary Portland cement to carry out artificial wall building on the lower open hole section, drilling to the position of a casing with a first open hole, reserving a cement plug of 10m, circulating the rest of the casing to the ground by using a drilling pump, connecting the casing with the first open hole by using the drilling pump, boosting the pressure to 2MPa by using clean water, waiting for setting for 48 hours, using a phi 94mm PDC coreless drill bit and a phi 68mm drill collar of 80m to 470m, and observing consumption conditions by using circulating drilling fluid.
After the artificial wall construction is finished, simple hydrological observation is carried out in the drilling process, the drilling speed is recorded every 0.5m within the range of 30m above the top plate of the goaf according to the graph, the drilling speed is accurately recorded every 2m in the drilling process. And (3) predicting the beginning of entering a goaf fracture zone, recording the drilling speed, the drilling water level, the drill sticking, the drill burying, the drill falling, the rock core crushing and the air suction condition in detail, and judging the zone development condition of the goaf of the main coal mining layer.
Drilling efficiency comparison table for artificial wall making technology and traditional process
Compared with the traditional process, the artificial wall manufacturing technology can save the cost by 16.43 ten thousand yuan; has considerable economic benefit, and is shown in an analysis table according to the analysis of personnel and materials.
Personnel and material cost analysis table
The invention is applied to six well drilling, water injection and mud jacking are successful, the time of upper hole throwing is saved, a drill bit with the diameter of 94mm and a drill rod with the diameter of 50mm quickly drill the caving zone and the goaf, and the traditional application process of drill collars with the diameter of 94mm and the diameter of 68mm is abandoned, so that the accidents of burying and sticking can be effectively reduced. By the reform of the drilling process, the drilling efficiency is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for artificially building a wall in a coal mining subsidence area for treating drilling engineering is characterized by comprising the following steps:
s1, drilling a hole for the first time on the fourth series covering layer of the subsidence area by using a drill machine matched with a drill bit, wherein the drilling depth is 274 m;
s2, replacing the drill bit to perform secondary drilling on the basis of the primary hole opening, and selecting a reasonable position to complete the secondary drilling;
s3, after the second drilling is finished, a drill rod is put into the bottom of the hole, and a drilling machine liquid pump is adopted to circulate for more than two weeks by using a large pump volume of dilute drilling fluid;
s4, carrying out artificial wall building on the lower open hole section by using portland cement;
and S5, after the artificial wall is built, the simple hydrological observation is enhanced in the drilling process.
2. The method for treating the artificial wall of the drilling engineering in the coal mining subsidence area according to the claim 1, wherein the concrete steps of the step S1 include: the drilling machine adopts a phi 133mm centerless drill bit, phi 68mm drill collars 80m, phi 50mm drill rods and a phi 89mm hexagonal active drill rod to cooperate to perform first open hole drilling, the aperture of the first open hole drilling is 133mm, and a 127mm casing is put into the drilling machine after the drilling is finished to perform cement well cementation.
3. The method for treating the artificial wall of the drilling engineering in the coal mining subsidence area according to claim 1, which is characterized in that: the drilling machine for the second drilling process adopts a phi 94mm coreless drill bit, a phi 68mm drill collar 65m, a phi 50mm drill rod and a phi 89mm hexagonal active drill rod to be matched on the basis of the first drilling for second drilling, the aperture of the second drilling is 94mm, and the drilling machine drills to 470m under the principle that the drilling depth is deepened as much as possible in two zones (a water-guiding fractured zone and an caving zone) in a non-drilled subsidence area in consideration of the consumption condition of drilling fluid, the hydrostatic level, the water-guiding fractured zone and the like.
4. The method for treating the artificial wall of the drilling engineering in the coal mining subsidence area according to claim 1, which is characterized in that: in the step S3, the drill rod is a phi 50mm drill rod, an inner inserting pipe method is adopted, and the viscosity of the drilling fluid in the hole is controlled within 19S.
5. The method for treating the artificial wall of the drilling engineering in the coal mining subsidence area according to the claim 1, wherein the concrete steps of the step S4 include: carrying out artificial wall building on a lower open hole section by using PO42.5 type common silicate cement (added with 2-3% of water glass), drilling to the position of a casing pipe with a first opening, reserving a cement plug of 10m, circulating the rest to the ground by using a drilling pump, boosting the pressure of the casing pipe with the first opening by using clean water to 2MPa, after waiting for setting for 48 hours, putting a phi 94mm PDC coreless drill bit and a phi 68mm drill collar of 80m into the hole to 470m, and observing the consumption condition by using circulating drilling fluid.
6. The method for treating the artificial wall of the drilling engineering in the coal mining subsidence area according to claim 5, wherein the hydrological observation contents comprise: the drilling speed is recorded every 0.5m within the range of 30m above the top plate of the goaf, the drilling speed is accurately recorded every 2m in the drilling process. And (3) predicting the beginning of entering a goaf fracture zone, recording the drilling speed, the drilling water level, the drill sticking, the drill burying, the drill falling, the rock core crushing and the air suction condition in detail, and judging the two-zone development condition of the goaf of the main coal mining layer.
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| CN202010325215.6A CN111411909A (en) | 2020-04-23 | 2020-04-23 | Artificial wall building method for treating drilling engineering in coal mining subsidence area |
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| CN114753762A (en) * | 2022-05-07 | 2022-07-15 | 山西省勘察设计研究院有限公司 | Drilling process for middle-deep geothermal well drilling construction |
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