CN113622864A - Method for sealing and reversely grouting orifice of ground-immersed drill hole - Google Patents
Method for sealing and reversely grouting orifice of ground-immersed drill hole Download PDFInfo
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- CN113622864A CN113622864A CN202010372007.1A CN202010372007A CN113622864A CN 113622864 A CN113622864 A CN 113622864A CN 202010372007 A CN202010372007 A CN 202010372007A CN 113622864 A CN113622864 A CN 113622864A
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- 238000007789 sealing Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 67
- 238000005553 drilling Methods 0.000 claims abstract description 75
- 239000002002 slurry Substances 0.000 claims description 62
- 239000004568 cement Substances 0.000 claims description 54
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 31
- 239000010962 carbon steel Substances 0.000 claims description 31
- 238000010276 construction Methods 0.000 claims description 26
- 238000003466 welding Methods 0.000 claims description 21
- 229910052770 Uranium Inorganic materials 0.000 claims description 13
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000005065 mining Methods 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 10
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000007569 slipcasting Methods 0.000 abstract description 9
- 239000011440 grout Substances 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000002386 leaching Methods 0.000 description 9
- 238000011065 in-situ storage Methods 0.000 description 8
- 230000005484 gravity Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011148 porous material Substances 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
- 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
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The utility model provides a ground soaks drilling hole drill way sealing and reverse slip casting technology, transfer the slip casting pipe to the drilling bottom in the well casing, seal the ground surface drill way, utilize chemical pump, pass through the slip casting pipe with grout, the annular space that forms with the naked hole is injected into to the well casing by the well casing bottom, replace the drilling mud in the annular space, according to Pascal's law principle, drilling mud constantly returns from the earth's surface, after grout returns from the earth's surface, prove that grout has all replaced the drilling mud in the annular space, accomplish reverse slip casting. Compared with a segmented forward grouting well cementation method, the reverse grouting well cementation is more compact, and the potential quality hazard in the grouting process is thoroughly solved.
Description
Technical Field
The invention belongs to the technical field of drilling construction processes in production of in-situ leaching uranium mining mines, and particularly relates to an in-situ leaching drilling orifice sealing and reverse grouting process.
Background
For a long time, the well cementation construction of in-situ leaching uranium mining process wells and hydrological test wells in China selects a forward grouting method, and the main construction procedures are as follows: firstly, after the hole drilling is finished and the hole construction is bare, the well pipe is lowered; placing a grouting pipe to the bottommost part of the well pipe in an annular space formed by the well pipe and the bare hole; thirdly, injecting cement slurry into the bottom of the drilled hole through a grouting pipe by using a chemical pump; fourthly, after a certain amount of cement slurry is injected, lifting the grouting pipe for a certain distance, injecting the cement slurry again, lifting for a certain distance again after injection, repeatedly operating, and performing sectional grouting; fifthly, lifting the grouting pipe to the wellhead to complete grouting and finish well cementation.
In the forward grouting well cementation method, the instantaneous injection amount of cement slurry cannot be accurately controlled in the construction process, and the excessive injection amount can cause the cement slurry to enter a sleeve through the bottom of a drill hole and scrap the drill hole; when the injection amount is too small, cement slurry can form a bridging phenomenon in an annular space formed by the well pipe and the bare hole, the well cementation strength is reduced, and the well pipe is broken in the using process of a drill hole.
In order to solve the above problems, it is necessary to develop a reverse grouting process for in-situ leaching and drilling.
Disclosure of Invention
The invention aims to: the utility model provides a ground soaks drilling hole drill way sealing and reverse slip casting technology, transfer the slip casting pipe to the drilling bottom in the well casing, seal the ground surface drill way, utilize chemical pump, pass through the slip casting pipe with grout, the annular space that forms with the naked hole is injected into to the well casing by the well casing bottom, replace the drilling mud in the annular space, according to Pascal's law principle, drilling mud constantly returns from the earth's surface, after grout returns from the earth's surface, prove that grout has all replaced the drilling mud in the annular space, accomplish reverse slip casting. Compared with a segmented forward grouting well cementation method, the reverse grouting well cementation is more compact, and the potential quality hazard in the grouting process is thoroughly solved.
The technical scheme of the invention is as follows: an in-situ leaching drilling hole opening sealing and reverse grouting method comprises the following steps:
(a) the ground dip uranium mining drilling well pipe is made of UPVC, the inner diameter is 80-130 mm, the wall thickness is 10-12 mm, the pressure resistance of the well pipe is 2.5-3.0 Mpa, the pore diameter is 250-350 mm when a bare hole is constructed in ground dip uranium mining drilling, the well pipe is lowered after the construction of the bare hole is finished, the lowering depth of the well pipe is 2-3 m of the upper end of an ore layer, and the well pipe is connected by screw threads;
(b) putting a grouting pipe into the well pipe, and connecting the grouting pipe and the well pipe by adopting screw threads, wherein the depth of the screw threads is 1.0-1.5 mm, and the pressure resistance of a connecting part is 2.0-2.5 Mpa;
(c) sealing the well mouth of the well pipe by using a special sealing cover, wherein the special sealing cover is connected with the well pipe by adopting a screw thread; the grouting pipe passes through the special sealing cover to enter the well pipe,
(d) arranging a cross beam on a drilling tower of the drilling machine;
(e) a hydraulic jack is respectively arranged between the cross beam (5) and the special sealing cover and on the left side and the right side, and the hydraulic jack is adjusted to enable the pressure reading of the hydraulic jack to be 0.4-0.5 Mpa;
(f) the method comprises the steps that a grouting pipe is connected with a slurry pump, the slurry pump is started, cement slurry is injected into the bottom of a well pipe of a drilling hole through the grouting pipe, the cement slurry enters an annular space formed by the well pipe and a bare hole from the bottom of the well pipe to replace drilling slurry in the annular space, the replaced drilling slurry continuously returns from the ground surface, the working frequency of the slurry pump is adjusted, the injection pressure of the cement slurry is controlled to be 1.3-1.5 Mpa, the ground surface discharge speed of the drilling slurry is guaranteed to be 1.0m3/h, and when the cement slurry returns from the ground surface, the cement slurry is proved to completely replace the drilling slurry in the annular space, and the slurry pump is closed;
(g) after the cement paste is condensed for 24 hours, sequentially removing the grouting equipment, taking out the grouting pipe, and finishing reverse grouting
In the step (a), the thread depth is 2-3 mm, the raw material belt is wound at the joint and the glue 804 is coated, and the pressure resistance of the thread is 1.5-1.6 Mpa.
In the step (b), the grouting pipe is a carbon steel pipe with the diameter of phi 40 multiplied by 3.5 mm.
In the step (b), the lowering depth of the bottom end of the grouting pipe is consistent with the depth of the bottom end of the well pipe
In the step (c), the joint of the grouting pipe and the special sealing cover is fixed by adopting a welding method, and the pressure resistance of the welding position is 2.0 Mpa.
In the step (c), the special sealing cover is made of carbon steel.
In the step (c), the thread depth is 2-3 mm, the raw material belt is wound on the connecting part, and the pressure resistance of the connecting part is 1.5-1.6 Mpa.
In the step (d), the cross beam is made of carbon steel, the thickness is 5-6 mm, the pressure resistance is greater than 3Mpa, and the vertical distance between the cross beam (5) and the ground surface is 0.5-0.8 m.
In the step (f), 425# cement is adopted for reverse grouting, and the water cement ratio is 1: 1.
The two sides of the special sealing cover are symmetrical carbon steel plates, the width of each carbon steel plate is 100mm, the thickness of each carbon steel plate is 5mm, the length of each single side is 400mm, the special sealing cover is an integral device, each part adopts a welding mode, and the whole special sealing cover is resistant to pressure of 2.5 Mpa.
The invention has the following remarkable effects: the problem of in the construction process of forward slip casting well cementation, because of the instantaneous injection volume of grout can't accurate control, the grout that leads to gets into the annular space formation "bridge" in the sleeve pipe, well casing and naked hole formation through the drilling bottom is solved. After reverse grouting and well cementation, cement slurry can be uniformly distributed in an annular space formed by the well pipe and the bare hole, the problem that drilling holes are scrapped due to the fact that the cement slurry enters the well pipe in the drilling and well cementation construction process is solved, and the problem that the well pipe is deformed due to the fact that bridging occurs in the annular space formed by the well pipe and the bare hole is solved. The construction method has the characteristics of low cost, easy operation and convenience for large-scale popularization of field construction operation. The method avoids the damage of the natural environment of the earth surface caused by the re-construction due to the failure of well cementation in the drilling construction process of the in-situ leaching uranium mining process, and has the advantages of environmental protection.
Drawings
FIG. 1 is a schematic view of an in situ leaching borehole orifice seal and reverse grouting;
in the figure: 1. a drilling tower; 2. a well pipe; 3. a grouting pipe; 4. a special sealing cover; 5. a cross beam; 6. a hydraulic jack; 7. annular space
Detailed Description
An in-situ leaching drilling orifice sealing and reverse grouting process comprises the following steps:
(a) the ground dip uranium mining drilling well pipe is made of UPVC, the inner diameter is 80-130 mm, the wall thickness is 10-12 mm, the pressure resistance of the well pipe is 2.5-3.0 Mpa, when the ground dip uranium mining drilling construction is conducted to form a bare hole, the hole diameter is 250-350 mm, after the construction of the bare hole is completed, the well pipe 2 is lowered, the lowering depth of the well pipe 2 is 2-3 m of the upper end of an ore layer, the well pipe 2 is connected through screw threads, the depth of the screw threads is 2-3 mm, a raw material belt is wound at the joint and is coated with 804 glue, and the pressure resistance of the screw threads is about 1.5-1.6 Mpa;
(b) a grouting pipe 3 is arranged in the well pipe 2, the grouting pipe 3 is a carbon steel pipe with the diameter of 40 multiplied by 3.5mm, the carbon steel pipe is connected by screw threads, the depth of the screw threads is 1.0-1.5 mm, the pressure of the joint is 2.0-2.5 Mpa, and the lowering depth of the bottom end of the grouting pipe 3 is consistent with the depth of the bottom end of the well pipe 2;
(c) sealing the well mouth of the well pipe 2 by using a special sealing cover 4, wherein the special sealing cover 4 is made of carbon steel, the special sealing cover 4 is connected with the well pipe 2 by adopting a screw thread, the depth of the screw thread is 2-3 mm, a raw material belt is wound at the connecting part, and the pressure resistance of the connecting part is 1.5-1.6 Mpa;
the grouting pipe (3) penetrates through the special sealing cover (4) to enter the well pipe (2), the joint of the grouting pipe (3) and the special sealing cover (4) is fixed by adopting a welding method, the pressure of the welding position is 2.0MPa, and the sealing performance of the welding position in the grouting process is guaranteed;
(d) arranging a cross beam 5 on a drilling rig derrick 1, wherein the cross beam 5 is made of carbon steel, the thickness is 5-6 mm, the pressure resistance is greater than 3Mpa, and the vertical distance between the cross beam 5 and the ground surface is 0.5-0.8 m;
(e) arranging a hydraulic jack 6 between the cross beam 5 and the special sealing cover 4 and on the left side and the right side respectively, and adjusting the hydraulic jack 6 to enable the pressure indication number to be 0.4-0.5 Mpa;
(f) the reverse grouting adopts 425# cement, the water cement ratio is 1:1, a grouting pipe 3 is connected with a slurry pump, the slurry pump is started, cement slurry is injected into the bottom of a well pipe 2 of a drilling hole through the grouting pipe 3, the cement slurry enters an annular space 7 formed by the well pipe 2 and a bare hole from the bottom of the well pipe 2 to replace the drilling slurry in the annular space 7, the replaced drilling slurry continuously returns from the earth surface, the working frequency of the slurry pump is adjusted, the injection pressure of the cement slurry is controlled to be 1.3-1.5 MPa, the earth surface discharge speed of the drilling slurry is guaranteed to be about 1.0m3/h, and when the cement slurry returns from the earth surface, the cement slurry is proved to completely replace the drilling slurry in the annular space 7, and the slurry pump is closed.
(g) After the cement paste is condensed for 24 hours, sequentially removing the grouting equipment, taking out the grouting pipe, and finishing reverse grouting
The two sides of the special sealing cover (4) are symmetrical carbon steel plates, the width of each carbon steel plate is 100mm, the thickness of each carbon steel plate is 5mm, the length of each single side is 400mm, the special sealing cover (4) is an integral device, all parts adopt a welding mode, and the whole special sealing cover is resistant to pressure of 2.5 Mpa.
The beam 5 is welded and fixed on the drilling rig 1, and the pressure resistance of a welding point is required to be more than 2.0 Mpa.
The hydraulic jack (6) has the effects that the inherent gravity of the drilling tower (1) is utilized, the inherent gravity is transmitted to the special sealing cover (4) through the hydraulic jack (6), downward pressure is applied to the special sealing cover (4), screw thread sealing is assisted, the pressure borne by a screw thread part is reduced, and the well mouth sealing performance of the well pipe (2) is guaranteed.
The guarantee well head leakproofness of well casing (2) is the construction key point, according to Pascal's law, and well head leakproofness is not tight, can lead to partly inside the cement paste gets into the well casing, leads to the drilling to scrap.
The pressure in the well pipe (2) is 1.3Mpa in the reverse grouting process, the pressure is close to the upper limit value of the pressure resistance of the joint of the special sealing cover (4) and the well pipe (2) by 1.5Mpa, the hydraulic jack (6) can effectively assist the special sealing cover (4) in sealing the wellhead of the well pipe (2), the upper limit of the pressure resistance of the joint of the special sealing cover (4) and the well pipe (2) is increased to 1.9Mpa, and the sealing performance of the wellhead in the reverse grouting process is guaranteed.
In the reverse grouting process, the grouting pipe (3) does not need to be lifted in the whole process, the annular space (7) is gradually filled with cement slurry from bottom to top, the operation steps of sectional grouting are simplified, and the construction stability is enhanced.
Example 1 was carried out:
(a)1-1111 is a liquid injection drilling hole of a mine for leaching uranium from a certain place of inner Mongolia, wherein an ore layer is positioned at the underground position of 302-310 meters, a phi 215 roller bit is used for bare hole drilling, the bare hole drilling is carried out to the position of 310m, the bare hole construction is completed, and the aperture is about 250 mm; lowering the well pipe (2), wherein the well pipe (2) is a UPVC pipe with the diameter of 100 multiplied by 10, the well pipe is connected by screw threads, the depth of the screw threads is 2.5mm, a raw material belt is wound at the joint and is coated with 804 glue, the pressure of the screw threads is 1.5Mpa, and the well pipe (2) is lowered to the position with the depth of a naked hole of 300 m;
(b) a grouting pipe (3) is arranged in the well pipe (2) in a downward mode, the grouting pipe (3) is a carbon steel pipe with the diameter of 40 multiplied by 3.5mm and is connected through screw threads, the depth of each screw thread is 1.5mm, the pressure resistance of the joint is 2.2MPa, the grouting pipe (3) is arranged to be 300m in downward mode, and the outlet position of the bottom end of the grouting pipe (3) is consistent with the depth of the bottom end of the well pipe (2);
(c) the upper end wellhead of the well pipe (2) is sealed by using a special sealing cover (4), the special sealing cover (4) is made of carbon steel, the special sealing cover (4) is connected with the well pipe (2) by adopting screw threads, the depth of the screw threads is 2.5mm, a raw material belt is wound at the connecting part, and the pressure resistance of the connecting part is 1.5 Mpa;
(d) a cross beam (5) is arranged on the drilling tower (1), the cross beam (5) is made of carbon steel, the thickness is 5mm, the pressure resistance is 3.0MPa, and the vertical distance between the cross beam (5) and the ground surface is 0.6 m;
(e) a hydraulic jack (6) is respectively arranged between the beam (5) and the special sealing cover (4) and on the left side and the right side, and the hydraulic jack (6) is adjusted to enable the pressure reading to be 0.4 Mpa;
(f) the reverse grouting adopts 425# cement, the water cement ratio is 1:1, a grouting pipe (3) is connected with a mud pump, the mud pump is started, cement slurry is injected into the bottom of a drilling well pipe (2) through the grouting pipe (3), the cement slurry enters an annular space (7) formed by the well pipe and a bare hole from the bottom of the well pipe (2) to replace the drilling slurry in the annular space (7), the replaced drilling slurry continuously returns from the earth surface, the working frequency of the mud pump is adjusted, the injection pressure of the cement slurry is controlled to be 1.3Mpa, the earth surface discharge speed of the drilling slurry is guaranteed to be about 1.0m3/h, and when the cement slurry returns from the earth surface, the cement slurry is proved to completely replace the drilling slurry in the annular space (7), and the mud pump is closed.
(g) And (5) after the cement paste is solidified for 24 hours, sequentially removing grouting equipment, taking out the grouting pipes, and finishing reverse grouting.
The grouting pipe (3) penetrates through the special sealing cover (4) to enter the well pipe (2), the joint of the grouting pipe (3) and the special sealing cover (4) is fixed by adopting a welding method, the pressure of the welding position is 2.0MPa, and the sealing performance of the welding position in the grouting process is guaranteed.
The two sides of the special sealing cover (4) are symmetrical carbon steel plates, the width of the carbon steel plates is 100mm, the thickness of the carbon steel plates is 5mm, the length of one side is 400mm, the special sealing cover (4) is an integral device, all parts adopt a welding mode, and the whole special sealing cover is resistant to pressure of 2.5 Mpa.
According to the above process for sealing the orifice of the ground immersion drilling and reverse grouting, the beam is welded and fixed on the drilling tower of the drilling machine, and the pressure resistance of a welding point is required to be more than 2.0 MPa.
The hydraulic jack (6) has the functions of utilizing the inherent gravity of the drilling tower (1), transmitting the inherent gravity to the special sealing cover (4) through the hydraulic jack (6), applying downward pressure to the special sealing cover (4), assisting screw thread sealing, reducing the pressure born by a screw thread part and ensuring the well mouth sealing performance of the well pipe (2).
In the reverse grouting construction process, the guarantee of the wellhead sealing performance of the well pipe (2) is a construction key point, and according to the Pascal law, the wellhead sealing performance is not tight, so that part of cement slurry enters the inside of the well pipe, and a drill hole is scrapped.
The pressure in the well pipe (2) is 1.3Mpa in the reverse grouting process, the pressure is close to the upper limit value of the pressure resistance of the joint of the special sealing cover (4) and the well pipe (2) by 1.5Mpa, the hydraulic jack (6) can effectively assist the special sealing cover (4) in sealing the wellhead of the well pipe (2), the upper limit of the pressure resistance of the joint of the special sealing cover (4) and the well pipe (2) is increased to 1.9Mpa, and the sealing performance of the wellhead in the reverse grouting process is guaranteed.
In the reverse grouting process, the grouting pipe (3) does not need to be lifted up in the whole process, and the annular space (7) is gradually filled with cement slurry from bottom to top, so that the operation steps of sectional grouting are simplified, and the construction stability is enhanced.
Example 2 was carried out:
(a)2-1111 is a liquid-extracting drill hole of a uranium mine leached from a certain place of inner Mongolia, an ore layer is positioned at 402-410 m underground, a phi 311 roller bit is used for bare hole drilling, the bare hole is drilled to a position of 410m, bare hole construction is completed, and the aperture is about 350 mm; putting the well pipe (2) downwards, wherein the well pipe (2) is a UPVC pipe with the diameter of 152 multiplied by 12, the screw thread is adopted for connection, the depth of the screw thread is 3.0mm, a raw material belt is wound at the connection position and is coated with 804 glue, the pressure resistance at the screw thread position is 1.6Mpa, and the well pipe (2) is put to the position with the depth of a naked hole of 400 m;
(b) a grouting pipe (3) is arranged in the well pipe (2) in a downward mode, the grouting pipe (3) is a carbon steel pipe with the diameter of 40 multiplied by 3.5mm and is connected through screw threads, the depth of each screw thread is 1.5mm, the pressure resistance of the joint is 2.2MPa, the grouting pipe (3) is arranged to be 400m in downward mode, and the outlet position of the bottom end of the grouting pipe (3) is consistent with the depth of the bottom end of the well pipe (2);
(c) the upper end wellhead of the well pipe (2) is sealed by using a special sealing cover (4), the special sealing cover (4) is made of carbon steel, the special sealing cover (4) is connected with the well pipe (2) by adopting screw threads, the depth of the screw threads is 3.0mm, a raw material belt is wound at the connecting part, and the pressure resistance of the connecting part is 1.6 Mpa;
(d) a cross beam (5) is arranged on the drilling tower (1), the cross beam (5) is made of carbon steel, the thickness is 5mm, the pressure resistance is 3.0MPa, and the vertical distance between the cross beam (5) and the ground surface is 0.6 m;
(e) a hydraulic jack (6) is respectively arranged between the beam (5) and the special sealing cover (4) and on the left side and the right side, and the hydraulic jack (6) is adjusted to enable the pressure reading to be 0.5 Mpa;
(f) the reverse grouting adopts 425# cement, the water cement ratio is 1:1, a grouting pipe (3) is connected with a mud pump, the mud pump is started, cement slurry is injected into the bottom of a drilling well pipe (2) through the grouting pipe (3), the cement slurry enters an annular space (7) formed by the well pipe and a bare hole from the bottom of the well pipe (2) to replace the drilling slurry in the annular space (7), the replaced drilling slurry continuously returns from the earth surface, the working frequency of the mud pump is adjusted, the injection pressure of the cement slurry is controlled to be 1.5Mpa, the earth surface discharge speed of the drilling slurry is guaranteed to be about 1.0m3/h, and when the cement slurry returns from the earth surface, the cement slurry is proved to completely replace the drilling slurry in the annular space (7), and the mud pump is closed.
(g) And (5) after the cement paste is solidified for 24 hours, sequentially removing grouting equipment, taking out the grouting pipes, and finishing reverse grouting.
The grouting pipe (3) penetrates through the special sealing cover (4) to enter the well pipe (2), the joint of the grouting pipe (3) and the special sealing cover (4) is fixed by adopting a welding method, the pressure of the welding position is 2.0MPa, and the sealing performance of the welding position in the grouting process is guaranteed.
The two sides of the special sealing cover (4) are symmetrical carbon steel plates, the width of the carbon steel plates is 150mm, the thickness of the carbon steel plates is 5mm, the length of one side is 400mm, the special sealing cover (4) is an integral device, all parts adopt a welding mode, and the whole special sealing cover is resistant to pressure of 2.5 Mpa.
According to the above process for sealing the orifice of the ground immersion drilling and reverse grouting, the beam is welded and fixed on the drilling tower of the drilling machine, and the pressure resistance of a welding point is required to be more than 2.0 MPa.
The hydraulic jack (6) has the functions of utilizing the inherent gravity of the drilling tower (1), transmitting the inherent gravity to the special sealing cover (4) through the hydraulic jack (6), applying downward pressure to the special sealing cover (4), assisting screw thread sealing, reducing the pressure born by a screw thread part and ensuring the well mouth sealing performance of the well pipe (2).
In the reverse grouting construction process, the guarantee of the wellhead sealing performance of the well pipe (2) is a construction key point, and according to the Pascal law, the wellhead sealing performance is not tight, so that part of cement slurry enters the inside of the well pipe, and a drill hole is scrapped.
The pressure in the well pipe (2) is 1.5Mpa in the reverse grouting process, the pressure is close to the upper limit value of the pressure resistance of the joint of the special sealing cover (4) and the well pipe (2) by 1.6Mpa, the hydraulic jack (6) can effectively assist the special sealing cover (4) in sealing the wellhead of the well pipe (2), the upper limit of the pressure resistance of the joint of the special sealing cover (4) and the well pipe (2) is increased to 2.1Mpa, and the sealing performance of the wellhead in the reverse grouting process is guaranteed.
In the reverse grouting process, the grouting pipe (3) does not need to be lifted up in the whole process, and the annular space (7) is gradually filled with cement slurry from bottom to top, so that the operation steps of sectional grouting are simplified, and the construction stability is enhanced.
Claims (10)
1. The method for sealing the orifice of the ground-immersed drill hole and reversely grouting is characterized by comprising the following steps: the method comprises the following steps:
(a) the ground dip uranium mining drilling well pipe is made of UPVC (unplasticized polyvinyl chloride), the inner diameter of the ground dip uranium mining drilling well pipe is 80-130 mm, the wall thickness of the ground dip uranium mining drilling well pipe is 10-12 mm, the pressure resistance of the well pipe is 2.5-3.0 Mpa, the aperture of the ground dip uranium mining drilling well pipe is 250-350 mm during construction of a naked hole, the well pipe (2) is lowered after the construction of the naked hole is completed, the lowering depth of the well pipe (2) is 2-3 m of the upper end of an ore layer, and the well pipe (2) is connected by screw threads;
(b) a grouting pipe (3) is put into the well pipe (2) and connected by screw threads, the depth of the screw threads is 1.0-1.5 mm, and the pressure resistance of the joint is 2.0-2.5 Mpa;
(c) sealing the well mouth of the well pipe (2) by using a special sealing cover (4), wherein the special sealing cover (4) is connected with the well pipe (2) by adopting a screw thread; the grouting pipe (3) passes through the special sealing cover (4) and enters the well pipe (2),
(d) a cross beam (5) is arranged on a drilling rig derrick (1);
(e) a hydraulic jack (6) is respectively arranged between the cross beam (5) and the special sealing cover (4) and on the left side and the right side, and the hydraulic jack (6) is adjusted to enable the pressure reading number to be 0.4-0.5 Mpa;
(f) the mud pump is started, cement slurry is injected into the bottom of a drilling well pipe (2) through the mud injection pipe (3), the cement slurry enters an annular space (7) formed by the well pipe (2) and a bare hole from the bottom of the well pipe (2), the drilling mud in the annular space (7) is replaced, the replaced drilling mud continuously returns from the earth surface, the working frequency of the mud pump is adjusted, the injection pressure of the cement slurry is controlled to be 1.3-1.5 Mpa, the earth surface outflow speed of the drilling mud is guaranteed to be 1.0m3/h, and after the cement slurry returns from the earth surface, the cement slurry is proved to completely replace the drilling mud in the annular space (7), and the mud pump is closed;
(g) and (5) after the cement paste is solidified for 24 hours, sequentially removing grouting equipment, taking out the grouting pipes, and finishing reverse grouting.
2. The method of claim 1, wherein the method comprises the steps of: in the step (a), the thread depth is 2-3 mm, the raw material belt is wound at the joint and the glue 804 is coated, and the pressure resistance of the thread is 1.5-1.6 Mpa.
3. The method of claim 1, wherein the method comprises the steps of: in the step (b), the grouting pipe (3) is a carbon steel pipe with the diameter of phi 40 multiplied by 3.5 mm.
4. The method of claim 1, wherein the method comprises the steps of: in the step (b), the lowering depth of the bottom end of the grouting pipe (3) is consistent with the depth of the bottom end of the well pipe (2).
5. The method of claim 1, wherein the method comprises the steps of: in the step (c), the joint of the grouting pipe (3) and the special sealing cover (4) is fixed by adopting a welding method, and the pressure resistance of the welding position is 2.0 Mpa.
6. The method of claim 1, wherein the method comprises the steps of: in the step (c), the special sealing cover (4) is made of carbon steel.
7. The method of claim 1, wherein the method comprises the steps of: in the step (c), the thread depth is 2-3 mm, the raw material belt is wound on the connecting part, and the pressure resistance of the connecting part is 1.5-1.6 Mpa.
8. The method of claim 1, wherein the method comprises the steps of: in the step (d), the cross beam (5) is made of carbon steel, the thickness is 5-6 mm, the pressure resistance is greater than 3Mpa, and the vertical distance between the cross beam (5) and the ground surface is 0.5-0.8 m.
9. The method of claim 1, wherein the method comprises the steps of: in the step (f), 425# cement is adopted for reverse grouting, and the water cement ratio is 1: 1.
10. The method of claim 4, wherein the method comprises the steps of: the two sides of the special sealing cover (4) are symmetrical carbon steel plates, the width of each carbon steel plate is 100mm, the thickness of each carbon steel plate is 5mm, the length of each single side is 400mm, the special sealing cover (4) is an integral device, all parts adopt a welding mode, and the whole special sealing cover is resistant to pressure of 2.5 Mpa.
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| CN201358744Y (en) * | 2009-02-04 | 2009-12-09 | 中国石化股份胜利油田分公司现河采油厂 | Well head pressing and sealing device of oil-water well |
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