CN113622864B - Method for sealing and reversely grouting orifice of in-situ leaching drilling hole - Google Patents
Method for sealing and reversely grouting orifice of in-situ leaching drilling hole Download PDFInfo
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- CN113622864B CN113622864B CN202010372007.1A CN202010372007A CN113622864B CN 113622864 B CN113622864 B CN 113622864B CN 202010372007 A CN202010372007 A CN 202010372007A CN 113622864 B CN113622864 B CN 113622864B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The method comprises the steps of lowering a grouting pipe to the bottom of a borehole in a well pipe, sealing the surface hole, injecting cement slurry into an annular space formed by the well pipe and a bare hole from the bottom end of the well pipe through the grouting pipe by using a chemical pump, replacing drilling mud in the annular space, continuously returning the drilling mud from the surface according to the Pascal law principle, and after the cement slurry is returned from the surface, proving that the cement slurry has completely replaced the drilling mud in the annular space to finish reverse grouting. Compared with the sectional forward grouting well cementation method, the reverse grouting well cementation is more compact, and the hidden quality trouble existing in the grouting process is thoroughly solved.
Description
Technical Field
The invention belongs to the technical field of on-site leaching uranium mine production drilling construction processes, and particularly relates to an on-site leaching drilling hole orifice sealing and reverse grouting process.
Background
For a long time, the well cementation construction of the uranium mining process well and the hydrological test well is a forward grouting method, which mainly comprises the following construction procedures: (1) after drilling the bare hole, lowering the well pipe; (2) in the annular space formed by the well pipe and the bare hole, lowering the grouting pipe to the bottommost part of the well pipe; (3) injecting cement slurry into the bottom of a drilling hole through a grouting pipe by using a chemical pump; (4) after a certain amount of cement slurry is injected, lifting a grouting pipe for a certain distance, re-injecting cement slurry, lifting for a certain distance again after injection, repeating the operation, and grouting in sections; (5) and lifting the grouting pipe to the wellhead to finish grouting, and ending well cementation.
In the well cementation method of forward grouting, the instantaneous injection quantity of cement paste in the construction process cannot be accurately controlled, and the excessive injection quantity can lead the cement paste to enter a casing through the bottom of a drilling hole, so that the drilling hole is scrapped; the injection quantity is too small, cement paste can form a bridging phenomenon in an annular space formed by the well pipe and the bare hole, so that the well cementation strength is reduced, and the well pipe is broken in the using process of the drilling hole.
In order to solve the above problems, there is a need to develop an in-situ leaching drilling reverse grouting process.
Disclosure of Invention
The invention aims at: the utility model provides a dip drilling drill hole seals and reverse slip casting technology, put the slip casting pipe to the drilling bottom in the well pipe, seal the earth's surface drill hole, utilize the chemical pump, pass through the slip casting pipe with grout, the annular space that well pipe and naked hole formed is injected into from well pipe 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 having the grout to return from the earth's surface, prove that grout has completely replaced the drilling mud in the annular space, accomplish reverse slip casting. Compared with the sectional forward grouting well cementation method, the reverse grouting well cementation is more compact, and the hidden quality trouble existing in the grouting process is thoroughly solved.
The technical scheme of the invention is as follows: an in-situ leaching drilling orifice sealing and reverse grouting method comprises the following steps:
(a) The material of the in-situ leaching uranium mining drilling well pipe is UPVC, the inner diameter is 80-130 mm, the wall thickness is 10-12 mm, the well pipe pressure resistance is 2.5-3.0 Mpa, when the in-situ leaching uranium mining drilling is used for constructing a bare hole, the aperture is 250-350 mm, after the construction of the bare hole is completed, the well pipe is lowered, the lowering depth of the well pipe is 2-3 m at the upper end of a mineral layer, and the well pipe is connected by screw threads;
(b) A grouting pipe is put into the well pipe and connected by screw threads, the screw thread depth is 1.0-1.5 mm, and the pressure resistance at the joint is 2.0-2.5 Mpa;
(c) Sealing the wellhead of the well pipe by using a special sealing cover, wherein the special sealing cover is connected with the well pipe by screw threads; the grouting pipe passes through the special sealing cover and enters the interior of the well pipe,
(d) A beam is arranged on a drilling tower of the drilling machine;
(e) A hydraulic jack is arranged between the cross beam (5) and the special sealing cover at the left side and the right side, and the hydraulic jack is regulated to ensure that the pressure indication is 0.4-0.5 Mpa;
(f) The grouting pipe is connected with the slurry pump, the slurry pump is started, cement slurry is injected into the bottom of the drilling well pipe through the grouting pipe, the cement slurry enters an annular space formed by the well pipe and the bare hole from the bottom of the well pipe to replace drilling slurry in the annular space, the replaced drilling slurry is continuously returned from the ground surface, the working frequency of the slurry pump is regulated, the injection pressure of the cement slurry is controlled to be 1.3-1.5 Mpa, the surface flushing speed of the drilling slurry is ensured to be 1.0m < 3 >/h, and when the cement slurry is returned 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 coagulated for 24 hours, sequentially removing grouting equipment, taking out a grouting pipe, and finishing reverse grouting
In the step (a), the screw thread depth is 2-3 mm, the raw material tape is wound at the joint and 804 glue is smeared, and the pressure resistance at the screw thread is 1.5-1.6 Mpa.
In the step (b), the grouting pipe is a phi 40 multiplied by 3.5mm carbon steel pipe.
In the step (b), the bottom end lowering depth of the grouting pipe is consistent with the bottom end depth 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 part is 2.0Mpa.
In the step (c), the special sealing cover is made of carbon steel.
In the step (c), the screw thread depth is 2-3 mm, the raw material tape is wound at the connecting part, and the pressure resistance at 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 more 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), the reverse grouting adopts 425# cement, and the water-cement ratio is 1:1.
The two sides of the special sealing cover 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 is an integral device, all parts adopt a welding mode, and the integral pressure resistance of the special sealing cover is 2.5Mpa.
The invention has the remarkable effects that: the problems that cement slurry enters the casing through the bottom of a drilled hole and a bridge is formed in an annular space formed by the well pipe and a bare hole and the like because the instantaneous injection amount of the cement slurry cannot be accurately controlled in the forward grouting well cementation construction process are solved. After reverse grouting well cementation, cement paste can be uniformly distributed in an annular space formed by the well pipe and the bare hole, so that the problem that drilling is scrapped due to the fact that cement paste enters the well pipe in the drilling well cementation construction process is solved, and the problem that the well pipe is deformed due to bridging 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 convenient popularization of field construction operation in a large scale. The application of the method avoids the damage of re-construction to the natural environment of the earth surface due to failure of well cementation construction in the drilling construction process of the in-situ leaching uranium mining process, and has the advantages of being green and environment-friendly.
Drawings
FIG. 1 is a schematic illustration of in-situ leaching borehole orifice sealing and reverse grouting;
in the figure: 1. a drilling tower; 2. a well pipe; 3. 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, which comprises the following steps:
(a) The material of the in-situ leaching uranium mining drilling well pipe is UPVC, the inner diameter is 80-130 mm, the wall thickness is 10-12 mm, the well pipe pressure resistance is 2.5-3.0 Mpa, when the in-situ leaching uranium mining drilling is used for constructing a bare hole, the aperture is 250-350 mm, after the construction of the bare hole is completed, the well pipe 2 is put down, the put down depth of the well pipe 2 is 2-3 m at the upper end of a mineral layer, the well pipe 2 is connected by screw threads, the screw threads depth is 2-3 mm, a raw material belt is wound at the connecting position and 804 glue is smeared, and the pressure resistance at the screw threads is about 1.5-1.6 Mpa;
(b) A grouting pipe 3 is put into the well pipe 2, the grouting pipe 3 is a carbon steel pipe with phi 40 multiplied by 3.5mm, the carbon steel pipe is connected by screw threads, the screw thread depth is 1.0-1.5 mm, the pressure resistance at the connecting part is 2.0-2.5 Mpa, and the bottom end lowering depth of the grouting pipe 3 is consistent with the bottom end depth of the well pipe 2;
(c) The wellhead of the well pipe 2 is sealed by 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 screw threads, the screw thread depth 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) passes through the special sealing cover (4) and enters 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 resistance of the welding position is 2.0Mpa, and the tightness of the welding position in the grouting process is ensured;
(d) A beam 5 is arranged on a drilling tower 1 of the drilling machine, the beam 5 is made of carbon steel, the thickness is 5-6 mm, the pressure resistance is more than 3Mpa, and the vertical distance between the beam 5 and the ground surface is 0.5-0.8 m;
(e) A hydraulic jack 6 is respectively arranged at the left side and the right side between the cross beam 5 and the special sealing cover 4, and the hydraulic jack 6 is regulated to ensure that the pressure indication is 0.4-0.5 Mpa;
(f) The reverse grouting adopts 425# cement, the water cement ratio is 1:1, the grouting pipe 3 is connected with a slurry pump, the slurry pump is started, cement slurry is injected into the bottom of the drilling well pipe 2 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, the drilling slurry in the annular space 7 is replaced, the replaced drilling slurry continuously returns from the ground surface, the working frequency of the slurry pump is regulated, the injection pressure of the cement slurry is controlled to be 1.3-1.5 Mpa, the ground surface surging speed of the drilling slurry is guaranteed to be about 1.0m3/h, and after the cement slurry returns from the ground surface, the cement slurry is proved to completely replace the drilling slurry in the annular space 7, and the slurry pump is turned off.
(g) After the cement paste is coagulated for 24 hours, sequentially removing grouting equipment, taking out a grouting pipe, and finishing reverse grouting
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, each part adopts a welding mode, and the integral pressure resistance of the special sealing cover is 2.5Mpa.
The cross beam 5 is welded and fixed on the drilling tower 1 of the drilling machine, and the pressure resistance of the welding point is required to be more than 2.0Mpa.
The hydraulic jack (6) is used for transmitting the inherent gravity to the special sealing cover (4) through the hydraulic jack (6) by utilizing the inherent gravity of the drilling tower (1), applying downward pressure to the special sealing cover (4), assisting in screw thread sealing, reducing the pressure born by screw thread parts and guaranteeing the wellhead tightness of the well pipe (2).
The wellhead tightness of the well pipe (2) is guaranteed to be a construction key point, and according to the Pascal law, the wellhead tightness is not tight, so that part of cement paste can enter the well pipe to cause drilling to be scrapped.
The pressure in the well pipe (2) in the reverse grouting process is 1.3Mpa, the pressure-resistant upper limit value of the joint of the special sealing cover (4) and the well pipe (2) is close to 1.5Mpa, and the arrangement of the hydraulic jack (6) can effectively assist the special sealing cover (4) to seal the wellhead of the well pipe (2), so that the pressure-resistant upper limit of the joint of the special sealing cover (4) and the well pipe (2) is raised to 1.9Mpa, and the tightness of the wellhead in the reverse grouting process is ensured.
In the reverse grouting process, the whole process does not need to lift the grouting pipe (3), 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.
Implementation example 1:
(a) 1-1111 is injection drilling of a uranium mining mine immersed in a certain area of inner Mongolia, wherein a mineral layer is positioned at 302-310 m underground, a bare hole is drilled by using a phi 215 roller bit, the bare hole is drilled to the 310m position, and the construction of the bare hole is completed, and the aperture is about 250mm; the well pipe (2) is lowered, the well pipe (2) is a UPVC pipe with phi of 100 multiplied by 10, the threaded connection is adopted, the threaded depth is 2.5mm, a raw material belt is wound at the connection position, 804 glue is smeared, the pressure resistance at the threaded position is 1.5Mpa, and the well pipe (2) is lowered to the depth position of 300m of the bare hole;
(b) A grouting pipe (3) is put down in the well pipe (2), the grouting pipe (3) is a carbon steel pipe with phi 40 multiplied by 3.5mm, the carbon steel pipe is connected by screw threads, the screw thread depth is 1.5mm, the pressure resistance of the connecting part is 2.2Mpa, the grouting pipe (3) is put down to a 300m position, and the outlet position of the bottom end of the grouting pipe (3) is consistent with the bottom end depth of the well pipe (2);
(c) Sealing the upper end wellhead 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 screw threads, the screw thread depth is 2.5mm, a raw material belt is wound at the connecting part, and the pressure resistance of the connecting part is 1.5Mpa;
(d) A beam (5) is arranged on the drilling tower (1), the beam (5) is made of carbon steel, the thickness is 5mm, the pressure resistance is 3.0Mpa, and the vertical distance between the beam (5) and the ground surface is 0.6m;
(e) A hydraulic jack (6) is arranged between the cross beam (5) and the special sealing cover (4) at the left side and the right side, and the hydraulic jack (6) is regulated to have the pressure indication of 0.4Mpa;
(f) The reverse grouting adopts 425# cement, the cement ratio is 1:1, the grouting pipe (3) is connected with the slurry pump, the slurry pump is started, cement slurry is injected into the bottom of the drilling well pipe (2) through the grouting pipe (3), the cement slurry enters an annular space (7) formed by the well pipe and the bare hole from the bottom of the well pipe (2), the drilling slurry in the annular space (7) is replaced, the replaced drilling slurry continuously returns from the ground surface, the working frequency of the slurry pump is regulated, the injection pressure of the cement slurry is controlled at 1.3Mpa, the ground surface flushing speed of the drilling slurry is ensured to be about 1.0m3/h, and after the cement slurry returns from the ground surface, the cement slurry is proved to completely replace the drilling slurry in the annular space (7), and the slurry pump is closed.
(g) And after the cement paste is coagulated for 24 hours, sequentially removing grouting equipment, taking out the grouting pipe, and finishing reverse grouting.
The grouting pipe (3) passes through the special sealing cover (4) and enters 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 resistance of the welding position is 2.0Mpa, and the tightness of the welding position in the grouting process is ensured.
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, each part adopts a welding mode, and the integral pressure resistance of the special sealing cover is 2.5Mpa.
The cross beam is welded and fixed on a drilling tower of a drilling machine, and the pressure resistance of the welding point is required to be greater than 2.0Mpa.
The hydraulic jack (6) has the function of transmitting the inherent gravity to the special sealing cover (4) through the hydraulic jack (6) by utilizing the inherent gravity of the drilling tower (1), applying downward pressure to the special sealing cover (4), assisting in screw thread sealing, reducing the pressure born by screw thread parts and guaranteeing the wellhead tightness of the well pipe (2).
In the reverse grouting construction process, the wellhead tightness of the well pipe (2) is guaranteed to be a construction key point, and part of cement paste can enter the well pipe to cause drilling to be scrapped due to the fact that the wellhead tightness is not tight according to the Pascal law.
The pressure in the well pipe (2) in the reverse grouting process is 1.3Mpa, the pressure-resistant upper limit value of the joint of the special sealing cover (4) and the well pipe (2) is close to 1.5Mpa, and the arrangement of the hydraulic jack (6) can effectively assist the special sealing cover (4) to seal the wellhead of the well pipe (2), so that the pressure-resistant upper limit of the joint of the special sealing cover (4) and the well pipe (2) is raised to 1.9Mpa, and the tightness of the wellhead in the reverse grouting process is ensured.
The grouting pipe (3) is not required to be lifted in the whole process of reverse grouting, 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.
Implementation example 2:
(a) 2-1111 is liquid extraction drilling of an inner Mongolia uranium leaching mine, wherein a mineral layer is positioned at 402-410 m underground, a phi 311 roller bit bare hole is used for drilling, the bare hole is drilled to 410m, and the bare hole construction is completed, and the aperture is about 350mm; lowering a well pipe (2), wherein the well pipe (2) is a UPVC pipe with phi 152 multiplied by 12, the well pipe (2) is connected by adopting screw threads, the screw thread depth is 3.0mm, a raw material belt is wound at the connecting position, 804 glue is smeared on the connecting position, the pressure resistance at the screw thread position is 1.6Mpa, and the well pipe (2) is lowered to the depth position of 400m of the bare hole;
(b) A grouting pipe (3) is put down in the well pipe (2), the grouting pipe (3) is a carbon steel pipe with phi 40 multiplied by 3.5mm, the carbon steel pipe is connected by screw threads, the screw thread depth is 1.5mm, the pressure resistance of the connecting part is 2.2Mpa, the grouting pipe (3) is put down to the position of 400m, and the outlet position of the bottom end of the grouting pipe (3) is consistent with the bottom end depth of the well pipe (2);
(c) Sealing the upper end wellhead 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 screw threads, the screw thread depth is 3.0mm, a raw material belt is wound at the connecting part, and the pressure resistance of the connecting part is 1.6Mpa;
(d) A beam (5) is arranged on the drilling tower (1), the beam (5) is made of carbon steel, the thickness is 5mm, the pressure resistance is 3.0Mpa, and the vertical distance between the beam (5) and the ground surface is 0.6m;
(e) A hydraulic jack (6) is arranged between the cross beam (5) and the special sealing cover (4) at the left side and the right side, and the hydraulic jack (6) is regulated to have the pressure indication of 0.5Mpa;
(f) The reverse grouting adopts 425# cement, the cement ratio is 1:1, the grouting pipe (3) is connected with the slurry pump, the slurry pump is started, cement slurry is injected into the bottom of the drilling well pipe (2) through the grouting pipe (3), the cement slurry enters an annular space (7) formed by the well pipe and the bare hole from the bottom of the well pipe (2), the drilling slurry in the annular space (7) is replaced, the replaced drilling slurry continuously returns from the ground surface, the working frequency of the slurry pump is regulated, the injection pressure of the cement slurry is controlled at 1.5Mpa, the ground surface flushing speed of the drilling slurry is ensured to be about 1.0m3/h, and after the cement slurry returns from the ground surface, the cement slurry is proved to completely replace the drilling slurry in the annular space (7), and the slurry pump is closed.
(g) And after the cement paste is coagulated for 24 hours, sequentially removing grouting equipment, taking out the grouting pipe, and finishing reverse grouting.
The grouting pipe (3) passes through the special sealing cover (4) and enters 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 resistance of the welding position is 2.0Mpa, and the tightness of the welding position in the grouting process is ensured.
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, each part adopts a welding mode, and the integral pressure resistance of the special sealing cover is 2.5Mpa.
The cross beam is welded and fixed on a drilling tower of a drilling machine, and the pressure resistance of the welding point is required to be greater than 2.0Mpa.
The hydraulic jack (6) has the function of transmitting the inherent gravity to the special sealing cover (4) through the hydraulic jack (6) by utilizing the inherent gravity of the drilling tower (1), applying downward pressure to the special sealing cover (4), assisting in screw thread sealing, reducing the pressure born by screw thread parts and guaranteeing the wellhead tightness of the well pipe (2).
In the reverse grouting construction process, the wellhead tightness of the well pipe (2) is guaranteed to be a construction key point, and part of cement paste can enter the well pipe to cause drilling to be scrapped due to the fact that the wellhead tightness is not tight according to the Pascal law.
The pressure in the well pipe (2) in the reverse grouting process is 1.5Mpa, the pressure-resistant upper limit value of the joint of the special sealing cover (4) and the well pipe (2) is close to 1.6Mpa, and the arrangement of the hydraulic jack (6) can effectively assist the special sealing cover (4) to seal the wellhead of the well pipe (2), so that the pressure-resistant upper limit of the joint of the special sealing cover (4) and the well pipe (2) is raised to 2.1Mpa, and the tightness of the wellhead in the reverse grouting process is ensured.
The grouting pipe (3) is not required to be lifted in the whole process of reverse grouting, 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.
Claims (10)
1. An on-site immersed drilling orifice sealing and reverse grouting method is characterized in that: the method comprises the following steps:
(a) The material of the in-situ leaching uranium mining drilling well pipe is UPVC, the inner diameter is 80-130 mm, the wall thickness is 10-12 mm, the well pipe pressure resistance is 2.5-3.0 Mpa, when the in-situ leaching uranium mining drilling is used for constructing a bare hole, the aperture 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 at the upper end of a mineral 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 screw thread depth is 1.0-1.5 mm, and the pressure resistance at the connection part is 2.0-2.5 Mpa;
(c) Sealing the wellhead 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 screw threads; the grouting pipe (3) passes through the special sealing cover (4) to enter the well pipe (2),
(d) A cross beam (5) is arranged on the drilling rig (1);
(e) A hydraulic jack (6) is arranged between the cross beam (5) and the special sealing cover (4) at the left side and the right side, and the hydraulic jack (6) is regulated to have the pressure indication of 0.4-0.5 Mpa;
(f) The grouting pipe (3) is connected with a slurry pump, the slurry pump is started, cement slurry is injected into the bottom of the drilling well pipe (2) through the grouting pipe (3), 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), drilling slurry in the annular space (7) is replaced, the replaced drilling slurry continuously returns out from the ground surface, the working frequency of the slurry pump is regulated, the injection pressure of the cement slurry is controlled to be 1.3-1.5 Mpa, the ground surface surging speed of the drilling slurry is guaranteed to be 1.0m3/h, and after the cement slurry returns out from the ground 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 coagulated for 24 hours, sequentially removing grouting equipment, taking out a grouting pipe, and finishing reverse grouting;
the inherent gravity is transferred to the special sealing cover (4) through the hydraulic jack (6), and downward pressure is applied to the special sealing cover (4).
2. An in-situ leaching drilling orifice sealing and reverse grouting method according to claim 1, wherein: in the step (a), the screw thread depth is 2-3 mm, the raw material tape is wound at the joint and 804 glue is smeared, and the pressure resistance at the screw thread is 1.5-1.6 Mpa.
3. An in-situ leaching drilling orifice sealing and reverse grouting method according to claim 1, wherein: in the step (b), the grouting pipe (3) is a phi 40 multiplied by 3.5mm carbon steel pipe.
4. An in-situ leaching drilling orifice sealing and reverse grouting method according to claim 1, wherein: in the step (b), the bottom end lowering depth of the grouting pipe (3) is identical to the bottom end depth of the well pipe (2).
5. An in-situ leaching drilling orifice sealing and reverse grouting method according to claim 1, wherein: 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 part is 2.0Mpa.
6. An in-situ leaching drilling orifice sealing and reverse grouting method according to claim 1, wherein: in the step (c), the special sealing cover (4) is made of carbon steel.
7. An in-situ leaching drilling orifice sealing and reverse grouting method according to claim 1, wherein: in the step (c), the screw thread depth is 2-3 mm, the raw material tape is wound at the connecting part, and the pressure resistance at the connecting part is 1.5-1.6 Mpa.
8. An in-situ leaching drilling orifice sealing and reverse grouting method according to claim 1, wherein: in the step (d), the cross beam (5) is made of carbon steel, the thickness is 5-6 mm, the pressure resistance is more than 3Mpa, and the vertical distance between the cross beam (5) and the ground surface is 0.5-0.8 m.
9. An in-situ leaching drilling orifice sealing and reverse grouting method according to claim 1, wherein: in the step (f), the reverse grouting adopts 425# cement, and the water-cement ratio is 1:1.
10. An in-situ leaching drilling port sealing and reverse grouting method according to claim 4, wherein: 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, each part adopts a welding mode, and the integral pressure resistance of the special sealing cover is 2.5Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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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 |
| CN105804690B (en) * | 2014-12-30 | 2018-08-21 | 新疆中核天山铀业有限公司 | In-situ leaching process drilling inverse water mud device |
| CN107366505B (en) * | 2017-05-27 | 2019-05-17 | 中核通辽铀业有限责任公司 | A kind of ground-dipping uranium extraction hole structure construction method |
| CN107780879A (en) * | 2017-09-15 | 2018-03-09 | 核工业北京化工冶金研究院 | A kind of reverse inlet well well formation device and method |
| CN208203204U (en) * | 2018-05-03 | 2018-12-07 | 北京市水文地质工程地质大队 | Cope with the well head measurement and protective device that surface subsidence destroys |
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