CN115506739B - A single-tube coring method for soft strata in the Quaternary system - Google Patents
A single-tube coring method for soft strata in the Quaternary system Download PDFInfo
- Publication number
- CN115506739B CN115506739B CN202211198385.8A CN202211198385A CN115506739B CN 115506739 B CN115506739 B CN 115506739B CN 202211198385 A CN202211198385 A CN 202211198385A CN 115506739 B CN115506739 B CN 115506739B
- Authority
- CN
- China
- Prior art keywords
- core
- hole
- mud
- drilling
- return pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 51
- 229910002059 quaternary alloy Inorganic materials 0.000 title 1
- 238000005553 drilling Methods 0.000 claims abstract description 134
- 238000004080 punching Methods 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 59
- 239000011435 rock Substances 0.000 claims description 12
- 239000004579 marble Substances 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 claims description 8
- 238000011065 in-situ storage Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 239000013049 sediment Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 238000011010 flushing procedure Methods 0.000 abstract description 2
- 238000010304 firing Methods 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 239000012792 core layer Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
-
- 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/10—Formed core retaining or severing means
Landscapes
- 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)
Abstract
本发明属于地质取心方法技术领域，公开了一种第四系松软地层单管取心的方法。其主要技术特征为：将取心钻具下到孔底；取心钻进过程中密切关注泥浆泵压力，根据泥浆泵压力判断取心过程中是否取心正常，根据不同情况及时采取投球、干钻和烧心，避免因部分岩心散落造成岩心冲失或岩心丢失、准确判断烧心效果和是否发生岩心散落、有效提高岩心采集率延长岩心钻头的使用寿命，然后验证岩心是否有残留和岩心是否烧死或岩心丢失，如果岩心有残留，再次取心时不能不能大泵量孔底冲孔，而且应从残留岩心位置计算进尺，避免了残存的岩心被冲掉。
The present invention belongs to the technical field of geological coring methods, and discloses a method for coring a single tube in a soft quaternary formation. The main technical features are: lowering a coring drill to the bottom of a hole; paying close attention to the mud pump pressure during coring drilling, judging whether coring is normal during coring according to the mud pump pressure, taking ball throwing, dry drilling and core burning in time according to different situations, avoiding core flushing or core loss due to partial core scattering, accurately judging the core burning effect and whether core scattering occurs, effectively improving the core collection rate and extending the service life of the core drill bit, and then verifying whether there is any core residue and whether the core is burned or lost. If there is any core residue, a large amount of bottom hole punching cannot be performed when coring again, and the footage should be calculated from the position of the residual core to avoid the residual core being flushed away.
Description
Technical Field
The invention belongs to the technical field of geological coring methods, and particularly relates to a fourth series of soft stratum single-tube coring method.
Background
In order to study geologic formations, a coring system is required for performing a coring assay. The currently used single-pipe coring system mainly comprises a slurry pump, a slurry pump water inlet pipe, a slurry pump water return pipe, a slurry pressure pipe, a vertical shaft, a drill rod, a ball-throwing type reducing joint, a core barrel and a coring bit. The fourth series of soft stratum is soft in soil quality, and when the system is adopted to core the fourth series of soft stratum, the following defects exist:
Firstly, in the coring process, vibration or slurry flushing on the side wall of a core tube easily causes breakage or scattering of a part of core columns in the core tube, if the drilling is continued downwards, the slurry in the core tube easily flushes away the whole core column, so that a core is lost, coring fails, and because a core bit is located underground, people cannot observe, in a fourth series of soft stratum, the problem is more easy to occur:
Secondly, when the distance between the drilling position of the core tube and the set required position is 200 mm, after stopping the pump and rotating and throwing the steel ball to the reducing joint, an operator cannot judge whether the core is successfully burned or not when the core is required to be dry drilled, the core is easy to be not thoroughly burned due to different geological structures, the core is dropped in the process of lifting the core, the core is failed, and in order to ensure the success of the core burning as much as possible, the core is dry drilled for a plurality of times by using the core drill, so that the abrasion of the core drill is serious, the service life of the defect drill is shortened, and the core is more difficult to be taken out from the core tube when the core tube is lifted;
Thirdly, when the core barrel is taken out after the core is burned, the geological structure is relatively soft, so that partial core is easy to deviate from the core barrel, if verification is not carried out at this time, the core barrel is directly lifted out, partial core is left in a well hole, if the core barrel is taken out again, a large pump is adopted for punching the hole bottom, the residual core is punched, and the core collection rate is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fourth series of soft stratum single-tube coring method which can avoid core erosion or core loss caused by scattering of partial cores, accurately judge the core burning effect and whether core scattering occurs or not, effectively improve the core collection rate and prolong the service life of a core drill bit.
In order to solve the problems, the method for single tube coring of the soft stratum adopts the following technical scheme: the method comprises the following steps:
first, the core drilling tool is lowered to the bottom of the hole
After the core drill bit is lowered to the bottom of the hole, large pump quantity is used for punching, slurry is returned to the ground from the core barrel to the core drill bit through the gap between the core barrel and the hole wall, and sediment at the bottom of the hole is carried out of the drilled hole in the upward returning process;
second step, core drilling
The method comprises the steps of adjusting the quantity of slurry conveyed by a slurry pump to be small, rotating a drilling tool, cutting a stratum by a coring bit, coring and drilling, enabling a core column cut by an inner cutting edge to enter a core tube under the wrapping of the slurry, and tightly forbidding the core tube to move up and down in the drilling process, so that the core column is broken;
third, the slurry pump pressure is closely concerned in the core drilling process
Firstly, before the core drilling distance of a core tube does not reach 200 mm from the set requirement, if the pressure of a slurry pump is instantaneously increased in the core drilling process, the core column in the core tube is damaged or scattered, so that an annular gap between the core column and the core tube is blocked, the core column lacks the wrapping of slurry and is extremely easy to wash away, the core in the core tube is prevented from washing away, the core taking rate is ensured, and at the moment, the pump is stopped immediately and the rotation is stopped; directly entering a fourth step;
Secondly, in the core drilling process, the pump pressure of the slurry is in a normal range, when the drilling position distance of the core tube is 200 mm from the set required position, immediately stopping the pump, opening a return pipe valve to keep the three-way of the slurry pump, and stopping rotating at the same time;
fourth, throwing ball
After core drilling is stopped, a water tap is immediately opened to throw a marble hole, the marble is thrown into a drill rod and falls to a reducing joint marble joint seat by self weight, the pressure of a slurry liquid column in the drill rod above is sealed, a core in a core barrel is not influenced by the pressure of the liquid column, and meanwhile, the core barrel is prevented from falling off from the core barrel due to suction caused by too small gap between the core barrel and a drill hole in the process of lifting the drill;
Fifth step, dry drilling
After ball injection, the inner hole of the drill rod, the slurry pump and the slurry pump return pipe are in a communicated state, under the condition that the pump is stopped and slurry is not communicated, the core drill drills downwards for 80-100 mm, dry drilling and core burning drilling are carried out, and meanwhile whether slurry flows out from the slurry pump return pipe or not is observed;
if the mud pump water return pipe has mud flowing out at the moment, the bottom of the drill bit is blocked by the rock core; directly entering a sixth step;
Secondly, if no mud flows out of the mud pump return pipe at the moment, the bottom of the coring bit and the inner hole of the core barrel are not blocked by the core, the gap between the core barrel and the hole wall is still in a communication state, and dry drilling is continued for 80-100 mm until the mud flows out of the mud pump return pipe;
Sixth step, burning the heart
After the core barrel is dry drilled in situ for about 30-60 seconds, the drilling tool is jacked up by using the oil pressure of the drilling machine for about 80-100 mm, so that slurry enters the hole bottom from the gap between the core barrel and the hole wall, and the drill bit is lubricated and cooled to prevent the drill bit from burning out and is repeated for 1-2 times;
seventh, verifying whether the core has residues
Pulling up the drilling tool for 300-500 mm, rapidly lowering the drilling tool to the bottom of the hole, observing whether the drilling tool is lowered to the bottom of the hole, and observing whether the mud pump water return pipe has mud flowing out;
If the mud pump water return pipe does not flow out mud and the drilling tool is lowered to the hole bottom, the condition that no core at the hole bottom falls off at the hole bottom is indicated, and the core completely enters the core barrel and is burned, the eleventh step is directly carried out;
secondly, if the mud pump water return pipe does not flow out mud and the drilling tool cannot be lowered to the bottom of the hole, the core is burnt, but the core remains in the hole, and the eighth step is directly carried out;
and thirdly, if the mud pump water return pipe has mud flowing out, whether the drilling tool is lowered to the bottom of the hole or not, the core tube and the drilling hole are still in a communicating state, no death or core loss occurs, and the following steps are carried out at the moment:
Step one, dry drilling again
Under the condition that the pump is stopped and mud is not communicated, the core drill drills downwards for 80-100 mm, core burning drilling is carried out, and meanwhile, whether mud flows out from a mud pump water return pipe or not is observed;
If the mud pump water return pipe has mud flowing out at the moment, the bottom of the drill bit is blocked by the rock core; directly entering the second step;
Secondly, if no mud flows out of the mud pump water return pipe at the moment, the bottom of the coring bit and the inner hole of the core barrel are not blocked by the core, the gap between the core barrel and the hole wall is still in a communicating state, and then dry drilling is continued for 80-100 mm;
1. If the mud flows out from the mud pump water return pipe at the moment, the bottom of the drill bit is blocked by the rock core; directly entering the second step;
2. if no mud still flows out, the core may be lost, and the thirteenth step is directly carried out;
Step two, re-burning the heart
After the core barrel is dry drilled in situ for about 30-60 seconds, the drilling tool is jacked up by using the oil pressure of the drilling machine for about 80-100 mm, so that slurry enters the hole bottom from the gap between the core barrel and the hole wall, and the drill bit is lubricated and cooled to prevent the drill bit from burning out and is repeated for 1-2 times;
step three, again verifying whether the core has residues
Pulling up the drilling tool for 300-500 mm, rapidly lowering the drilling tool to the bottom of the hole, observing whether the drilling tool is lowered to the bottom of the hole, and observing whether the mud pump water return pipe has mud flowing out;
If the mud pump water return pipe does not flow out mud and the drilling tool is lowered to the hole bottom, the condition that no core at the hole bottom falls off at the hole bottom is indicated, and the core completely enters the core barrel and is burned, the eleventh step is directly carried out;
secondly, if the mud pump water return pipe does not flow out mud and the drilling tool cannot be lowered to the bottom of the hole, the core is burnt, but the core remains in the hole, and the eighth step is directly carried out;
thirdly, if the mud pump water return pipe has mud flowing out, directly entering a thirteenth step;
Eighth step, lifting the drill
Lifting a core-containing core, wherein the lifting speed is uniform, so that the core is prevented from falling off as much as possible due to negative pressure formed between the core and the hole wall;
Ninth step, taking out the core
Taking out the core from the core tube by using a mud pump return pipe to hold pressure;
tenth step, coring again
The core drill is lowered to the bottom of the hole, the core remains in the hole for the last time, in order to prevent the residual core from being lost, the hole bottom cannot be punched in a large pump quantity, the footage is calculated from the position of the residual core, the total length of the core cannot be exceeded, the core drilling process is started from the second step, and the circulation is started;
eleventh step, lifting the drill
Lifting a core-containing core, wherein the lifting speed is uniform, so that the core is prevented from falling off due to negative pressure formed between the core and the hole wall;
Twelfth step, taking out the core
Taking out the core from the core tube by using a water return pipe of a slurry pump to hold pressure, and directly entering a fourteenth step;
Thirteenth step, lifting drill for maintenance
Lifting the core barrel, overhauling or replacing a new core barrel, a drill bit and the like according to specific conditions, and continuing the following steps after the maintenance is completed;
Fourteenth step, coring again
Starting the core drilling start cycle from the first step; until the core is completely removed.
Compared with the prior art, the method for single-tube coring of the fourth series of soft stratum has the following advantages:
Firstly, if the pressure of a slurry pump is instantaneously increased in the coring drilling process before the coring drilling distance of the core pipe does not reach the set requirement of 200 mm, the core column in the core pipe is damaged or scattered, so that an annular gap between the core column and the core pipe is blocked, the core column lacks the wrapping of slurry and is extremely easy to wash away, the core in the core pipe is prevented from washing away, the core taking rate is ensured, and at the moment, a return water pipeline is immediately stopped and the rotation is stopped; directly entering the steps of ball throwing, dry drilling, core burning, drill lifting and the like, and taking out the core, so that the core in the core tube is prevented from being washed away under the pressure of slurry due to the fact that a core column in a part of the core tube is damaged or scattered, and the core taking rate is guaranteed;
Secondly, in the dry drilling step, after ball injection, a three-way valve of the slurry pump is opened to enable an inner hole of a drill rod, the slurry pump and a water return pipe of the slurry pump to be in a communicated state, and under the condition that the slurry is not communicated when the pump is stopped, a core drill drills down for 80-100 mm to perform core burning drilling, and meanwhile, whether the slurry flows out from the water return pipe of the slurry pump is observed; if the mud pump water return pipe has mud flowing out at the moment, the bottom of the drill bit is blocked by the rock core; directly entering the steps of firing, lifting the drill and the like, taking out the core, and completing a primary coring process; secondly, if no mud flows out of the mud pump return pipe at the moment, the bottom of the coring bit and the inner hole of the core barrel are not blocked by the core, the gap between the core barrel and the hole wall is still in a communication state, and dry drilling is continued for 80-100 mm until mud flows out of the mud pump return pipe; indicating that the bottom of the drill bit has been plugged by the core; directly entering the steps of firing, lifting the drill and the like, taking out the core, and completing a primary coring process; operators can judge that the bottom of the drill bit is blocked by the core according to whether slurry flows out in the dry drilling process, if the bottom of the drill bit is not blocked by the core, the core burning cannot be well realized, and in the drilling process, the core is easy to fall off from the core tube, so that the core is lost;
Thirdly, judging whether the core has residues or not before lifting the drill: by pulling up the drilling tool for 300-500 mm, rapidly lowering the drilling tool to the bottom of the hole, observing whether the drilling tool is lowered to the bottom of the hole or not, and observing whether the mud pump water return pipe flows out of mud or not; if the mud pump water return pipe has no mud flowing out and the drilling tool is lowered to the hole bottom, the condition that no core at the hole bottom falls to the hole bottom is indicated, the core is completely entered into the core barrel and is completely burned, the steps of drilling and taking out the core are carried out, the next core layer coring step is carried out again, the coring drilling tool is lowered to the hole bottom step in the first step of the core coring process of the layer, when the coring bit is lowered to the hole bottom, a large amount of pumps are used for punching, mud is returned to the ground from the core barrel to the coring bit through the clearance between the core barrel and the hole wall, and the hole bottom sediment is carried out to drill holes in the upward returning process; thus ensuring that the core does not contain impurities; secondly, if the mud pump water return pipe does not flow out mud and the drilling tool cannot be lowered to the bottom of the hole, the core is burnt, but the core remains in the hole, the core is lifted and taken out, the core is taken out again, the core of the next layer is taken out, the large-pump punching is not carried out in the core taking process of the core layer, the mud returns to the ground from the core pipe to the core drill bit through the gap between the core pipe and the hole wall, the hole bottom sediment is carried out of the drilling step in the upward returning process, the circulation is directly started from the second-step core taking drilling, the drill rod with the core pipe at the lower end is lowered to the bottom of the hole, the drilling rule is calculated from the position of the residual core, and the total length of the core cannot be exceeded, so that the residual core is completely taken out in the core taking process, the residual core is not lost, and the core collecting rate is improved; and thirdly, if the mud pump water return pipe has mud flowing out, whether the drilling tool is lowered to the bottom of the hole or not, the core tube and the drilling hole are still in a communicating state, no death or core loss occurs, and the following steps are carried out at the moment: and (3) dry drilling again and simultaneously observing whether mud flows out of the mud pump water return pipe: 1. if the mud flows out from the mud pump water return pipe at the moment, the bottom of the drill bit is blocked by the rock core; directly entering re-firing and re-verifying whether the core has residues; 2. if no mud flows out of the mud pump return pipe at this time, the bottom of the coring bit and the inner hole of the core barrel are not blocked by the core, and the gap between the core barrel and the hole wall is still in a communication state, and then dry drilling is continued for 80-100 mm; (1) If the mud pump water return pipe has mud flowing out at the moment, the bottom of the drill bit is blocked by the rock core; directly entering re-firing and re-verifying whether the core has residues; (2) If the mud still flows out, directly entering a drill lifting maintenance step; when the problem that the lower end of the core tube cannot be plugged due to the damage of the core bit or the core tube and the like occurs, the drill can be lifted for maintenance.
Drawings
FIG. 1 is a schematic diagram of a structure employing a single tube coring system;
FIG. 2 is a schematic view of a core in a core barrel under normal conditions;
FIG. 3 is a schematic view of a partially collapsed core in a core barrel;
fig. 4 is a schematic structural view of a ball-throwing type reducing joint.
Detailed Description
The method for single tube coring of a soft formation according to the fourth aspect of the present invention will be described in further detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1,2, 3 and 4, the single-tube coring system of the present invention is a schematic structural diagram of the single-tube coring system, and the single-tube coring system comprises a slurry pump 1, a slurry pump water inlet tube 2, a slurry pump water return tube 3, a slurry pressure tube 4, a slurry pump tee joint 11, a vertical shaft 12, a drill rod 5, a ball-throwing reducing joint 6, a marble 10, a core barrel 7 and a coring bit 8.
A method for single tube coring of a fourth line of soft formations, comprising the steps of:
first, the core drilling tool is lowered to the bottom of the hole
After the core drill bit is lowered to the bottom of the hole, large pump quantity is used for punching, slurry is returned to the ground from the core barrel to the core drill bit through the gap between the core barrel and the hole wall, and sediment at the bottom of the hole is carried out of the drilled hole in the upward returning process;
second step, core drilling
The method comprises the steps of adjusting the quantity of slurry conveyed by a slurry pump to be small, rotating a drilling tool, cutting a stratum by a coring bit, coring and drilling, enabling a core column cut by an inner cutting edge to enter a core tube under the wrapping of the slurry, and tightly forbidding the core tube to move up and down in the drilling process, so that the core column is broken;
third, the slurry pump pressure is closely concerned in the core drilling process
Firstly, before the core drilling distance of a core tube does not reach 200 mm from the set requirement, if the pressure of a slurry pump is instantaneously increased in the core drilling process, the core column in the core tube is damaged or scattered, so that an annular gap between the core column and the core tube is blocked, the core column lacks the wrapping of slurry and is extremely easy to wash away, the core in the core tube is prevented from washing away, the core taking rate is ensured, and at the moment, the pump is stopped immediately and the rotation is stopped; directly entering a fourth step;
Secondly, in the core drilling process, the pump pressure of the slurry is in a normal range, when the drilling position distance of the core tube is 200 mm from the set required position, immediately stopping the pump, opening a return pipe valve to keep the three-way of the slurry pump, and stopping rotating at the same time;
fourth, throwing ball
After core drilling is stopped, a water tap is immediately opened to throw a marble hole, the marble is thrown into a drill rod and falls to a reducing joint marble joint seat by self weight, the pressure of a slurry liquid column in the drill rod above is sealed, a core in a core barrel is not influenced by the pressure of the liquid column, and meanwhile, the core barrel is prevented from falling off from the core barrel due to suction caused by too small gap between the core barrel and a drill hole in the process of lifting the drill;
Fifth step, dry drilling
After ball injection, the inner hole of the drill rod, the slurry pump and the slurry pump return pipe are in a communicated state, under the condition that the pump is stopped and slurry is not communicated, the core drill drills downwards for 80-100 mm, dry drilling and core burning drilling are carried out, and meanwhile whether slurry flows out from the slurry pump return pipe or not is observed;
if the mud pump water return pipe has mud flowing out at the moment, the bottom of the drill bit is blocked by the rock core; directly entering a sixth step;
Secondly, if no mud flows out of the mud pump return pipe at the moment, the bottom of the coring bit and the inner hole of the core barrel are not blocked by the core, the gap between the core barrel and the hole wall is still in a communication state, and dry drilling is continued for 80-100 mm until the mud flows out of the mud pump return pipe;
Sixth step, burning the heart
After the core barrel is dry drilled in situ for about 30-60 seconds, the drilling tool is jacked up by using the oil pressure of the drilling machine for about 80-100 mm, so that slurry enters the hole bottom from the gap between the core barrel and the hole wall, and the drill bit is lubricated and cooled to prevent the drill bit from burning out and is repeated for 1-2 times;
seventh, verifying whether the core has residues
Pulling up the drilling tool for 300-500 mm, rapidly lowering the drilling tool to the bottom of the hole, observing whether the drilling tool is lowered to the bottom of the hole, and observing whether the mud pump water return pipe has mud flowing out;
If the mud pump water return pipe does not flow out mud and the drilling tool is lowered to the hole bottom, the condition that no core at the hole bottom falls off at the hole bottom is indicated, and the core completely enters the core barrel and is burned, the eleventh step is directly carried out;
secondly, if the mud pump water return pipe does not flow out mud and the drilling tool cannot be lowered to the bottom of the hole, the core is burnt, but the core remains in the hole, and the eighth step is directly carried out;
and thirdly, if the mud pump water return pipe has mud flowing out, whether the drilling tool is lowered to the bottom of the hole or not, the core tube and the drilling hole are still in a communicating state, no death or core loss occurs, and the following steps are carried out at the moment:
Step one, dry drilling again
Under the condition that the pump is stopped and mud is not communicated, the core drill drills downwards for 80-100 mm, core burning drilling is carried out, and meanwhile, whether mud flows out from a mud pump water return pipe or not is observed;
If the mud pump water return pipe has mud flowing out at the moment, the bottom of the drill bit is blocked by the rock core; directly entering the second step;
Secondly, if no mud flows out of the mud pump water return pipe at the moment, the bottom of the coring bit and the inner hole of the core barrel are not blocked by the core, the gap between the core barrel and the hole wall is still in a communicating state, and then dry drilling is continued for 80-100 mm;
1. If the mud flows out from the mud pump water return pipe at the moment, the bottom of the drill bit is blocked by the rock core; directly entering the second step;
2. if no mud still flows out, the core may be lost, and the thirteenth step is directly carried out;
Step two, re-burning the heart
After the core barrel is dry drilled in situ for about 30-60 seconds, the drilling tool is jacked up by using the oil pressure of the drilling machine for about 80-100 mm, so that slurry enters the hole bottom from the gap between the core barrel and the hole wall, and the drill bit is lubricated and cooled to prevent the drill bit from burning out and is repeated for 1-2 times;
step three, again verifying whether the core has residues
Pulling up the drilling tool for 300-500 mm, rapidly lowering the drilling tool to the bottom of the hole, observing whether the drilling tool is lowered to the bottom of the hole, and observing whether the mud pump water return pipe has mud flowing out;
If the mud pump water return pipe does not flow out mud and the drilling tool is lowered to the hole bottom, the condition that no core at the hole bottom falls off at the hole bottom is indicated, and the core completely enters the core barrel and is burned, the eleventh step is directly carried out;
secondly, if the mud pump water return pipe does not flow out mud and the drilling tool cannot be lowered to the bottom of the hole, the core is burnt, but the core remains in the hole, and the eighth step is directly carried out;
thirdly, if the mud pump water return pipe has mud flowing out, directly entering a thirteenth step;
Eighth step, lifting the drill
Lifting a core-containing core, wherein the lifting speed is uniform, so that the core is prevented from falling off as much as possible due to negative pressure formed between the core and the hole wall;
Ninth step, taking out the core
Taking out the core from the core tube by using a mud pump return pipe to hold pressure;
tenth step, coring again
The core drill is lowered to the bottom of the hole, the core remains in the hole for the last time, in order to prevent the residual core from being lost, the hole bottom cannot be punched in a large pump quantity, the footage is calculated from the position of the residual core, the total length of the core cannot be exceeded, the core drilling process is started from the second step, and the circulation is started;
eleventh step, lifting the drill
Lifting a core-containing core, wherein the lifting speed is uniform, so that the core is prevented from falling off due to negative pressure formed between the core and the hole wall;
Twelfth step, taking out the core
Taking out the core from the core tube by using a water return pipe of a slurry pump to hold pressure, and directly entering a fourteenth step;
Thirteenth step, lifting drill for maintenance
Lifting the core barrel, overhauling or replacing a new core barrel, a drill bit and the like according to specific conditions, and continuing the following steps after the maintenance is completed;
Fourteenth step, coring again
Starting the core drilling start cycle from the first step; until the core is completely removed.
The scope of the present invention is not limited to the above embodiments, and falls within the scope of the present invention as long as the method of single tube coring of the fourth line of soft formation is the same or similar.
Claims (1)
1. The fourth series of soft stratum single tube coring method is characterized in that: the method comprises the following steps:
first, the core drilling tool is lowered to the bottom of the hole
After the core drill bit is lowered to the bottom of the hole, large pump quantity is used for punching, slurry is returned to the ground from the core barrel to the core drill bit through the gap between the core barrel and the hole wall, and sediment at the bottom of the hole is carried out of the drilled hole in the upward returning process;
second step, core drilling
The method comprises the steps of adjusting the quantity of slurry conveyed by a slurry pump to be small, rotating a drilling tool, cutting a stratum by a coring bit, coring and drilling, enabling a core column cut by an inner cutting edge to enter a core tube under the wrapping of the slurry, and tightly forbidding the core tube to move up and down in the drilling process, so that the core column is broken;
third, the slurry pump pressure is closely concerned in the core drilling process
Before the core drilling distance of the core pipe does not reach the set requirement of 200 mm, if the pump pressure of slurry is instantaneously increased in the core drilling process, the core column in the core pipe is damaged or scattered, so that an annular gap between the core column and the core pipe is blocked, the core column lacks the wrapping of slurry and is extremely easy to wash away, and the pump and the rotation should be stopped immediately in order to prevent the core in the core pipe from washing away; directly entering a fourth step;
In the core drilling process, the pump pressure of the slurry pump is in a normal range, when the drilling position distance of the core tube is 200 mm from a set required position, immediately stopping the pump, opening a return pipe valve to keep a three-way of the slurry pump, and stopping rotating at the same time;
fourth, throwing ball
After core drilling is stopped, a water tap is immediately opened to throw a marble hole, the marble is thrown into a drill rod and falls to a reducing joint marble joint seat by self weight, the pressure of a slurry liquid column in the drill rod above is sealed, a core in a core barrel is not influenced by the pressure of the liquid column, and meanwhile, the core barrel is prevented from falling off from the core barrel due to suction caused by too small gap between the core barrel and a drill hole in the process of lifting the drill;
Fifth step, dry drilling
After ball injection, the inner hole of the drill rod, the slurry pump and the slurry pump return pipe are in a communicated state, under the condition that the pump is stopped and slurry is not communicated, the core drill drills downwards for 80-100 mm, dry drilling and core burning drilling are carried out, and meanwhile whether slurry flows out from the slurry pump return pipe or not is observed;
If the mud flows out from the mud pump water return pipe at the moment, the bottom of the drill bit is blocked by the rock core; directly entering a sixth step;
If no mud flows out of the mud pump return pipe at the moment, the bottom of the coring bit and the inner hole of the core barrel are not blocked by the core, and a gap between the core barrel and the hole wall is still in a communication state, and dry drilling is continued for 80-100 mm until mud flows out of the mud pump return pipe;
Sixth step, burning the heart
After the core barrel is dry drilled in situ for 30-60 seconds, the drilling tool is jacked up by using the oil pressure of the drilling machine for 80-100 mm, so that slurry enters the bottom of the hole from the gap between the core barrel and the hole wall, and the drill bit is lubricated and cooled to prevent the drill bit from burning out and is repeated for 1-2 times;
seventh, verifying whether the core has residues
Pulling up the drilling tool for 300-500 mm, rapidly lowering the drilling tool to the bottom of the hole, observing whether the drilling tool is lowered to the bottom of the hole, and observing whether the mud pump water return pipe has mud flowing out;
If the mud pump water return pipe does not flow out mud and the drilling tool is lowered to the hole bottom, the condition that no core falls off at the hole bottom is indicated, and the core completely enters the core barrel and is burned, the eleventh step is directly carried out;
If the mud pump water return pipe does not flow out mud and the drilling tool cannot be lowered to the bottom of the hole, the core is burnt, but the core remains in the hole, and the eighth step is directly carried out;
if the mud pump return pipe has mud to flow out, whether the drilling tool is lowered to the bottom of the hole or not, the core tube and the drilling hole are still in a communicating state, no burnout or core loss occurs, and the following steps are carried out at this time:
Step one, dry drilling again
Under the condition that the pump is stopped and mud is not communicated, the core drill drills downwards for 80-100 mm, core burning drilling is carried out, and meanwhile, whether mud flows out from a mud pump water return pipe or not is observed;
If the mud pump water return pipe has mud flowing out at the moment, the bottom of the drill bit is blocked by the rock core; directly entering the second step;
Secondly, if no mud flows out of the mud pump water return pipe at the moment, the bottom of the coring bit and the inner hole of the core barrel are not blocked by the core, the gap between the core barrel and the hole wall is still in a communicating state, and then dry drilling is continued for 80-100 mm;
if the mud flows out from the mud pump water return pipe at the moment, the bottom of the drill bit is blocked by the rock core; directly entering the second step;
if no mud still flows out, the core may be lost, and the thirteenth step is directly carried out;
Step two, re-burning the heart
After the core barrel is dry drilled in situ for 30-60 seconds, the drilling tool is jacked up by using the oil pressure of the drilling machine for 80-100 mm, so that slurry enters the bottom of the hole from the gap between the core barrel and the hole wall, and the drill bit is lubricated and cooled to prevent the drill bit from burning out and is repeated for 1-2 times;
step three, again verifying whether the core has residues
Pulling up the drilling tool for 300-500 mm, rapidly lowering the drilling tool to the bottom of the hole, observing whether the drilling tool is lowered to the bottom of the hole, and observing whether the mud pump water return pipe has mud flowing out;
If the mud pump water return pipe does not flow out mud and the drilling tool is lowered to the hole bottom, the condition that no core falls off at the hole bottom is indicated, and the core completely enters the core barrel and is burned, the eleventh step is directly carried out;
If the mud pump water return pipe does not flow out mud and the drilling tool cannot be lowered to the bottom of the hole, the core is burnt, but the core remains in the hole, and the eighth step is directly carried out;
if the mud flows out from the mud pump water return pipe, the mud directly enters a thirteenth step;
Eighth step, lifting the drill
Lifting a core-containing core, wherein the lifting speed is uniform, so that the core is prevented from falling off due to negative pressure formed between the core and the hole wall;
Ninth step, taking out the core
Taking out the core from the core tube by using a mud pump return pipe to hold pressure;
tenth step, coring again
The core drill is lowered to the bottom of the hole, the core remains in the hole for the last time, in order to prevent the residual core from being lost, the hole bottom cannot be punched in a large pump quantity, the footage is calculated from the position of the residual core, the total length of the core cannot be exceeded, the core drilling process is started from the second step, and the circulation is started;
eleventh step, lifting the drill
Lifting a core-containing core, wherein the lifting speed is uniform, so that the core is prevented from falling off due to negative pressure formed between the core and the hole wall;
Twelfth step, taking out the core
Taking out the core from the core tube by using a water return pipe of a slurry pump to hold pressure, and directly entering a fourteenth step;
Thirteenth step, lifting drill for maintenance
Lifting the core barrel, overhauling or replacing a new core barrel and a new drill bit according to specific conditions, and continuing the following steps after the maintenance is completed;
Fourteenth step, coring again
The cycle starts from the first step of coring drilling until the core is completely removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211198385.8A CN115506739B (en) | 2022-09-29 | 2022-09-29 | A single-tube coring method for soft strata in the Quaternary system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211198385.8A CN115506739B (en) | 2022-09-29 | 2022-09-29 | A single-tube coring method for soft strata in the Quaternary system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115506739A CN115506739A (en) | 2022-12-23 |
| CN115506739B true CN115506739B (en) | 2024-11-22 |
Family
ID=84509037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211198385.8A Active CN115506739B (en) | 2022-09-29 | 2022-09-29 | A single-tube coring method for soft strata in the Quaternary system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115506739B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103352671A (en) * | 2013-07-24 | 2013-10-16 | 李国民 | Rope core taking drill |
| CN111997550A (en) * | 2020-08-20 | 2020-11-27 | 中国煤炭地质总局勘查研究总院 | Loose stratum coring device and method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1794624A2 (en) * | 2004-09-10 | 2007-06-13 | ExxonMobil Upstream Research Company | A method for evaluating sedimentary basin properties by numerical modelling of sedimentation processes |
| CN214273581U (en) * | 2020-12-25 | 2021-09-24 | 吉林大学 | Lifting drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool |
-
2022
- 2022-09-29 CN CN202211198385.8A patent/CN115506739B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103352671A (en) * | 2013-07-24 | 2013-10-16 | 李国民 | Rope core taking drill |
| CN111997550A (en) * | 2020-08-20 | 2020-11-27 | 中国煤炭地质总局勘查研究总院 | Loose stratum coring device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115506739A (en) | 2022-12-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100412312C (en) | Method and device for repairing oil/gas drilling bushing | |
| CN103603625B (en) | Casing coring drilling tool and casing coring drilling method | |
| CN112726616B (en) | Reaming pile bottom slag removal device for heel-while-drilling tubular pile and construction method thereof | |
| CN105041255A (en) | Hole bottom combined drilling tool used for fishing broken falling objects in drilled hole and fishing method of hole bottom combined drilling tool | |
| CN114439452A (en) | Pipe string device for discharging brine from sediment gap of salt cavern gas storage and brine discharging method | |
| CN111622728A (en) | Horizontal well perforation process for connecting perforation of cable tractor with hydraulic conveying perforation | |
| CN105422016B (en) | One kind drilling cleaning system and method for cleaning | |
| CN115506739B (en) | A single-tube coring method for soft strata in the Quaternary system | |
| CN113431512A (en) | Ground-immersed drilling construction process | |
| WO2021249499A1 (en) | Wellbore segmented operation method and rubber plug for said method | |
| CN109057712A (en) | Anchor cable pore-creating twin-stage casing construction method | |
| CN219795197U (en) | Guiding milling cone for salt well workover milling sleeve | |
| CN111997550B (en) | Loose stratum coring device and method | |
| CN111305783A (en) | Fishing device and fishing method for underground junk | |
| CN206903614U (en) | A kind of silt particle fishing device of hydraulic-driven | |
| CN100532781C (en) | Gas drilling centering technique | |
| CN206617118U (en) | A kind of large diameter borehole drill bit with boring mud fishing device | |
| CN105064941B (en) | Quick continuous window sidetracking device | |
| CN204804733U (en) | Spindle drift size tool | |
| CN200943459Y (en) | Device for repairing oil-gas drilling casing | |
| CN222576629U (en) | A salvage cup | |
| CN113756760B (en) | Reverse gravel filling device and reverse gravel filling method | |
| CN220247999U (en) | Reaming is with pipe drilling tool that cores | |
| CN2767644Y (en) | By-pass valve | |
| CN217206379U (en) | Wrong broken casing pipe salvaging and centralizing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |