CN110700781B - Shale fluid-retaining closed coring device and method - Google Patents
Shale fluid-retaining closed coring device and method Download PDFInfo
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- CN110700781B CN110700781B CN201810745061.9A CN201810745061A CN110700781B CN 110700781 B CN110700781 B CN 110700781B CN 201810745061 A CN201810745061 A CN 201810745061A CN 110700781 B CN110700781 B CN 110700781B
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000012530 fluid Substances 0.000 claims abstract description 80
- 239000007789 gas Substances 0.000 claims abstract description 70
- 238000005553 drilling Methods 0.000 claims abstract description 67
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000005259 measurement Methods 0.000 claims abstract description 25
- 239000003345 natural gas Substances 0.000 claims abstract description 25
- 239000000725 suspension Substances 0.000 claims abstract description 16
- 239000011435 rock Substances 0.000 claims description 36
- 230000008569 process Effects 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 230000008014 freezing Effects 0.000 claims description 6
- 238000007710 freezing Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 3
- 238000011160 research Methods 0.000 abstract description 3
- 238000011234 economic evaluation Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 12
- 238000004364 calculation method Methods 0.000 description 8
- 238000003795 desorption Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 230000009467 reduction Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000001179 sorption measurement Methods 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/08—Coating, freezing, consolidating cores; Recovering uncontaminated cores or cores at formation pressure
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a shale fluid-retaining closed coring device and a method, comprising the following steps: the drill rod joint can drive the outer cylinder and the coring bit to rotate; a ball valve assembly, an inner cylinder, a plurality of fluid collecting tanks connected in series and a measurement while drilling device which are connected in sequence are arranged in the outer cylinder; a plurality of fluid collection tanks for collecting natural gas in the core; the measurement-while-drilling device is used for measuring the temperature and the pressure of the natural gas in the fluid collection tank; the shale fluid-preserving closed coring device further comprises a suspension assembly, wherein one end of the suspension assembly is connected with the outer cylinder, and the other end of the suspension assembly is respectively connected with the measurement-while-drilling device, the plurality of fluid collecting tanks and the inner cylinder, so that when the outer cylinder rotates, the inner cylinder does not rotate. When the core is extracted, the ball valve assembly is closed, the gas in the fluid collecting tank is not dissipated, the closed core shale sample and the content of the lost gas can be effectively obtained, the reliability and economic evaluation of the shale gas content and the shale gas reservoir reserves are improved, and the requirements of scientific research and production are met.
Description
Technical Field
The invention belongs to the technical field of shale gas exploration and development, and particularly relates to a shale fluid-retaining closed coring device and method.
Background
The gas content of the shale is an important parameter for resource evaluation and selective area evaluation, is also an important index for judging whether the shale has industrial value and economic benefit, accurately calculates the reserve volume of the gas reservoir, and has important significance for deploying development schemes. The shale gas content is generally obtained by field desorption, all free gas escapes, and the adsorbed gas is partially desorbed, wherein the field desorption gas content generally comprises three parts of desorbed gas, lost gas and residual gas. The desorbed gas is obtained by core desorption calculation, the residual gas is obtained by core crushing, the two researches are basically agreed, the dissimilarity is less, the calculation methods aiming at the lost gas are more, the calculation result difference is larger, and different mathematical regression methods can calculate different lost gas contents. The gas content testing precision is low, so that the shale gas reservoir reserves are low in calculation precision.
At present, the pressure maintaining closed coring is applied in the fields of conventional oil gas, coal bed gas, methane hydrate and the like, so that the oil gas can be prevented from escaping from a rock core in the process of tripping. Pressure-maintaining closed coring is a coring method which utilizes a closed liquid to prevent a drilling fluid from corroding a core and keep the core in an original formation pressure state all the time in the coring drilling process (Liubao and Chinese petroleum exploration and development encyclopedia (engineering volume); Beijing: oil industry Press 2008, 21-22.). However, the pressure-maintaining closed coring technology commonly used at present is not suitable for shale gas (especially for closed coring of deep high-temperature and high-pressure shale gas), so that a closed coring device and related engineering tests for marine high-pressure shale gas are not available at home.
The current technology mainly has the following defects: (1) although the temperature and the pressure of the closed coring of the conventional oil gas can meet the requirements of shale gas, the shale gas is inevitably desorbed due to the reduction of the temperature and the pressure in the drilling process due to the existence of the shale gas adsorption, a large amount of natural gas is desorbed due to the slight reduction of the temperature, and accidents such as pressure-holding blasting and the like can be caused by slight carelessness; (2) the closed coring device for the coal bed gas and the methane hydrate is mainly applied to the conditions of both low stratum temperature and high stratum pressure (the coal bed gas is 10-20 Mpa and 20-60 ℃, the methane hydrate is 1-10 Mpa and-10-28 ℃), is obviously lower than the deep layer shale gas is 50-100 Mpa and the temperature is 60-120 ℃, and is not suitable for closed coring of the shale gas. Therefore, there is no example of the application to the airtight closure coring of the shale at high temperature and high pressure.
Disclosure of Invention
The invention aims to overcome the blank of the existing domestic high-temperature and high-pressure shale gas reservoir shale closed coring technology and equipment, so that the shale gas reservoir shale closed coring technology and equipment can effectively obtain a shale sample subjected to closed coring and the content of lost gas, thereby ensuring the calculation precision of the total gas content and filling the blank of the domestic shale fluid-retaining closed coring device for measuring the gas content.
In order to achieve the above object, according to an aspect of the present invention, a shale fluid-retaining closed coring apparatus is provided, including a coring bit, an outer cylinder, and a drill rod joint, which are connected in sequence, wherein the drill rod joint can drive the outer cylinder and the coring bit to rotate;
a ball valve assembly, an inner cylinder, a plurality of fluid collecting tanks connected in series and a measurement while drilling device which are connected in sequence are arranged in the outer cylinder;
the plurality of fluid collection tanks are for collecting natural gas in the core;
the measurement while drilling device is used for measuring the temperature and the pressure of the natural gas in the fluid collection tank;
the device further comprises a suspension assembly, wherein one end of the suspension assembly is connected with the outer cylinder, and the other end of the suspension assembly is respectively connected with the measurement-while-drilling device, the plurality of fluid collecting tanks and the inner cylinder, so that when the outer cylinder rotates, the inner cylinder does not rotate.
Preferably, the suspension assembly comprises a bearing set by which the plurality of fluid collection tanks, the measurement while drilling gauge and the inner barrel are suspended from the inner wall of the outer barrel.
Preferably, the ball valve assembly further comprises a hydraulic mechanism, and the hydraulic mechanism is arranged in the outer barrel and used for controlling the opening and closing of the ball valve assembly.
Preferably, a safety valve is arranged between adjacent fluid collection tanks, and/or a safety valve is arranged between the fluid collection tank and the inner barrel.
Preferably, the end of the coring bit is provided with a piston hole, and a closed piston is arranged in the piston hole.
Preferably, a pin is arranged at the joint of the sealing piston and the drill bit.
Preferably, the measurement-while-drilling tool comprises a TPMS electronic multipoint measurement-while-drilling tool.
According to another aspect of the invention, a shale fluid-retaining closed coring method is provided, which comprises the following steps:
opening a ball valve assembly, putting the shale fluid-retaining closed coring device into a well, drilling a coring bit at a target layer position, allowing a rock core to enter an inner cylinder through the coring bit, and collecting natural gas in the rock core by a fluid collecting tank;
the measurement while drilling device continuously measures the temperature and pressure data of the natural gas collected in the fluid collection tank;
and (5) after coring, lifting the drill and closing the ball valve assembly.
Preferably, the end part of the coring bit is provided with a piston hole, and a closed piston is arranged in the piston hole;
the method further comprises the following steps: before the ball valve assembly is opened, the closed piston is fixed in the piston hole of the coring bit through a pin, and the inner cylinder is filled with a closed liquid at a well mouth.
Preferably, the method further comprises the following steps: and leading out the natural gas in the fluid collecting tank and the inner cylinder by using a gas guide tube, measuring, taking out the inner cylinder containing the rock core, freezing the inner cylinder containing the rock core by adopting liquid nitrogen, and then cutting and storing the inner cylinder and the rock core together.
The invention has the following beneficial effects:
when the drill bit drills and coring at a target layer position, all parts in the outer cylinder do not rotate along with the outer cylinder and the drill bit through the bearing set, the inner cylinder stores drilled rock cores, the inner cylinder is connected with the fluid collecting tanks and is used for collecting natural gas generated during drilling of the rock cores, the desorption speed of adsorbed gas in the rock cores can be reduced due to certain pressure sealing, when the coring and the drilling are carried out, the ball valve assembly is closed, the pressure is not too high, the gas in the fluid collecting tanks is not dissipated, a shale sample for closed coring and the content of lost gas can be effectively obtained, the calculation precision of the total gas content is guaranteed, the reliability and economic evaluation of shale gas reservoir reserves are improved, and the requirements of scientific research and production are met.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings. Wherein like reference numerals generally represent like parts throughout the exemplary embodiments.
Fig. 1 shows a schematic structural view of a shale fluid containment closed core apparatus in an embodiment of the present invention.
Description of reference numerals:
1. a closed piston; 2. a coring bit; 3. a ball valve assembly; 4. an inner barrel; 5. an outer cylinder; 6. a fluid collection tank; 7. a safety valve; 8. measuring while drilling; 9. a suspension assembly; 10. a drill rod joint.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the invention provides a shale fluid-retaining closed coring device which comprises a coring bit, an outer cylinder and a drill rod joint, wherein the coring bit, the outer cylinder and the drill rod joint are sequentially connected; a ball valve assembly, an inner cylinder, a plurality of fluid collecting tanks connected in series and a measurement while drilling device which are connected in sequence are arranged in the outer cylinder; a plurality of fluid collection tanks for collecting natural gas in the core; the measurement-while-drilling device is used for measuring the temperature and the pressure of the natural gas in the fluid collection tank;
the shale fluid-preserving closed coring device further comprises a suspension assembly, one end of the suspension assembly is connected with the outer cylinder, and the other end of the suspension assembly is respectively connected with the measurement-while-drilling device, the plurality of fluid collecting tanks and the inner cylinder, so that when the outer cylinder rotates, the inner cylinder does not rotate.
Specifically, the inner cylinder is connected to a plurality of fluid collection tanks connected in series for collecting natural gas in the core and desorbed gas released due to temperature and pressure drops during the drill extraction process.
Preferably, the suspension assembly comprises a bearing set, and the plurality of fluid collection tanks, the measurement while drilling device and the inner cylinder are suspended on the inner wall of the outer cylinder through the bearing set.
Specifically, the bearing set enables the inner barrel, the plurality of fluid collection tanks, and the measurement while drilling gauge to be non-rotatable with the outer barrel as the outer barrel rotates.
Preferably, the ball valve assembly further comprises a hydraulic mechanism, wherein the hydraulic mechanism is arranged in the outer barrel and used for controlling the opening and closing of the ball valve assembly.
Specifically, in the process of drilling a well and a drilling process of the fluid-tight coring device, the ball valve assembly is in an open state, the measuring system measures temperature and pressure data in the process of drilling the well and the drilling process while drilling, when coring is finished, the inner cylinder and the outer cylinder generate differential motion through hydraulic pressurization of the hydraulic mechanism, the ball valve is closed, and the whole inner cylinder, the measuring assembly and the fluid collecting tank form an independent sealing system.
Specifically, the hydraulic mechanism enables the inner cylinder and the outer cylinder to generate pressure difference by means of the circulating pressure of the drilling fluid, and the ball valve assembly is automatically closed.
Preferably, a safety valve is arranged between adjacent fluid collecting tanks, and/or a safety valve is arranged between the fluid collecting tank and the inner cylinder.
Specifically, when the maximum pressure of the safety valve is exceeded, gas enters the first fluid collection tank from the inner cylinder, and when the pressure in the first fluid collection tank increases beyond the maximum pressure of the safety valve, gas flows into the next fluid collection tank.
As the preferred scheme, the tip of coring bit has the piston hole, is equipped with airtight piston in the piston hole.
Specifically, the tool is sealed through the drill bit sealing piston, the ball valve assembly adopts a double-cylinder single-acting structure, the inner cylinder and the outer cylinder can move relatively, namely, the coring inner cylinder and the fluid collecting tank do not rotate, the outer cylinder drives the drill bit to rotate, the damage to a rock core caused by the rotation of the coring inner cylinder is avoided, and the integrity of a sample is kept.
Preferably, a pin is arranged at the joint of the closed piston and the drill bit.
Specifically, the coring bit performs coring drilling at a target layer, due to the action of bit pressure, when the drill meets the target layer, a pin at a closed piston is cut off before coring is started, and the piston moves upwards to enter an inner core barrel and is pushed by a core to move upwards along an inner barrel.
Preferably, the measurement-while-drilling tool comprises a TPMS electronic multipoint measurement-while-drilling tool.
Specifically, the TPMS electronic multi-point measurement while drilling technology realizes continuous measurement and recording of temperature and pressure, measurement data can reflect the tiny trend of core temperature and pressure change, and the desorption process of shale in the tripping process is known through comprehensive analysis of the measured data and natural gas collected by a fluid collection tank.
According to another aspect of the invention, a shale fluid-retaining closed coring method is provided, which comprises the following steps:
the method comprises the following steps: before the ball valve assembly is opened, the sealing piston is fixed in the piston hole of the drill bit through the pin, and the inner cylinder is filled with sealing liquid at the wellhead.
Step two: opening a ball valve assembly, putting the shale fluid-retaining closed coring device into a well, drilling a coring bit at a target layer position, allowing a rock core to enter an inner cylinder through the coring bit, and collecting natural gas in the rock core by a fluid collecting tank;
the measurement while drilling device continuously measures the temperature and pressure data of the natural gas collected in the fluid collection tank;
and (5) after coring, lifting the drill and closing the ball valve assembly.
Specifically, the drilling fluid circularly cleans and cools the outer lip surface through a drill bit water hole and an outer leakage water tank in the drilling process, so that the rock core is protected from being polluted by the drilling fluid. The ball valve assembly is in an open state, and the fluid-tight coring device is used for drilling a coring core in a well. The inner cylinder is connected with the fluid collecting tank through the one-way valve, the one-way valve only allows gas to pass through but liquid cannot pass through, sealing liquid in the cylinder can only be extruded by a rock core entering the inner cylinder and is continuously discharged downwards in an equal volume mode through an annular gap between the rock core and the inner cylinder, the discharged sealing liquid is continuously and uniformly coated on the surface of a rock core column to form a protective film, and a protective area in a certain range is formed around the rock core column at the bottom of a well, so that the rock core is prevented from being polluted by drilling fluid.
After coring, the drill is lifted, the hydraulic mechanism enables the inner cylinder and the outer cylinder to generate pressure difference by the circulating pressure of the drilling fluid, the ball valve assembly is closed, and the inside of the whole outer cylinder becomes an independent closed system. During the lifting process, free gas in the shale escapes and desorbed gas desorbs due to the pressure drop and temperature drop during the lifting process.
Step three: and leading out the natural gas in the fluid collecting tank and the inner cylinder by using the gas guide tube, measuring, taking out the inner cylinder containing the rock core, freezing the inner cylinder containing the rock core by adopting liquid nitrogen, and then cutting and storing the inner cylinder and the rock core together.
Before the core is taken out of the barrel, gas in the fluid collecting tank and the inner barrel is led out by the aid of the gas guide pipe and is measured, the core and the inner barrel are frozen together by liquid nitrogen through the freezing box, the frozen core is cut together with the inner barrel through the cutting machine, and the cut core needs to be frozen and stored conventionally by dry ice or a freezing cabinet again, so that the accuracy of core testing is improved.
The method prevents the drilling fluid from corroding the rock core in the drilling process, prevents the free shale gas from escaping and effectively collecting in the tripping process, slows down the desorption speed of the adsorbed gas, can accurately obtain the content of the lost gas, and improves the calculation precision of the shale gas content. The upper part of the inner cylinder adopts a group of fluid collecting tanks connected in series, and the lost gas and part of desorbed gas can be effectively collected. The method adopts an inner cylinder independent sealing mode, directly extracts the inner cylinder of the rock core to freeze and process the ground rock core, provides a sealed shale sample, improves the reliability of physical and chemical properties of other rocks of the rock core, and adopts an electronic multipoint measurement while drilling technology to measure a large amount of data in real time.
Example 1
Fig. 1 shows a schematic structural view of a shale fluid containment closed core apparatus in an embodiment of the present invention.
As shown in fig. 1, the embodiment provides a shale fluid-retaining closed coring device, which comprises a coring bit 2, an outer cylinder 5 and a drill rod joint 10, which are connected in sequence, wherein the drill rod joint 10 can drive the outer cylinder 5 and the coring bit 2 to rotate;
a ball valve assembly 3, an inner cylinder 4, a plurality of fluid collecting tanks 6 connected in series and a measurement while drilling device 8 which are connected in sequence are arranged in the outer cylinder 5; a plurality of fluid collection tanks 6 for collecting natural gas in the core; the measurement while drilling device 8 is used for measuring the temperature and the pressure of the natural gas in the fluid collection tank 6;
the device is still including hanging assembly 9, and the one end that hangs assembly 9 is connected with urceolus 5, and the other end is connected with measurement while drilling 8, a plurality of fluid collection tank 6 and inner tube 4 respectively, hangs assembly 9 and includes the bearing group, and a plurality of fluid collection tank 6, measurement while drilling 8 and inner tube 4 pass through the bearing group and hang on the inner wall of urceolus to when urceolus 5 rotates, inner tube 4 does not rotate.
The apparatus further comprises a hydraulic mechanism (not shown) disposed within the outer barrel 5 for controlling the opening and closing of the ball valve assembly 3. A safety valve is arranged between the adjacent fluid collecting tanks 6, and/or a safety valve is arranged between the fluid collecting tanks 6 and the inner cylinder 4, the end part of the coring bit 2 is provided with a piston hole, and a closed piston 1 is arranged in the piston hole.
The joint of the closed piston 1 and the coring bit 2 is provided with a pin, and the measurement-while-drilling device 8 comprises a TPMS electronic multipoint measurement-while-drilling device.
Example 2
The embodiment provides a shale fluid-retaining closed coring device, which comprises the following steps:
the method comprises the following steps: before the coring operation is started, the sealing piston 1 is fixed in a piston hole of the coring bit 2 through a pin, and the inner cylinder 4 is filled with sealing liquid at a wellhead.
Step two: opening the ball valve assembly 3, putting the shale fluid-retaining closed coring device into a well, drilling the core by the coring bit 2 at a target layer position, enabling the core to enter the inner cylinder 4 through the coring bit 2, and collecting natural gas in the core by the fluid collecting tank 6;
in the process of lifting the drill, the hydraulic mechanism enables the inner cylinder 4 and the outer cylinder 5 to generate pressure difference by means of the circulating pressure of drilling fluid, the ball valve assembly 3 is closed, the inside of the whole outer cylinder 5 becomes an independent closed system, and free gas in shale escapes and desorbed gas is desorbed due to pressure reduction and temperature reduction in the process of lifting the drill.
And (5) after coring, extracting the drill, and closing the ball valve assembly 3.
Step three: the natural gas in the fluid collecting tank 6 and the inner cylinder 4 is led out by using the gas guide tube and is measured, the inner cylinder 4 containing the core is taken out, the inner cylinder 4 containing the core is frozen by adopting liquid nitrogen, then the inner cylinder 4 and the core are cut together, and the cut core needs to be conventionally frozen and stored by using dry ice or a freezing cabinet again so as to improve the accuracy of core test.
The method prevents the drilling fluid from corroding the rock core in the drilling process, prevents the free shale gas from escaping and effectively collecting in the tripping process, slows down the desorption speed of the adsorbed gas, can accurately obtain the content of the lost gas, and improves the calculation precision of the shale gas content. The upper part of the inner cylinder adopts a group of fluid collecting tanks connected in series, and the lost gas and part of desorbed gas can be effectively collected. The method adopts an inner cylinder independent sealing mode, directly extracts the inner cylinder of the rock core to freeze and process the ground rock core, provides a sealed shale sample, improves the reliability of the physical and chemical properties of other rocks of the rock core, adopts an electronic multipoint measurement while drilling technology for a measurement assembly, and measures a large amount of data in real time.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (7)
1. The shale fluid-retaining closed coring device is characterized by comprising a coring bit, an outer cylinder and a drill rod joint which are sequentially connected, wherein the drill rod joint can drive the outer cylinder and the coring bit to rotate;
a ball valve assembly, an inner cylinder, a plurality of fluid collecting tanks connected in series and a measurement while drilling device which are connected in sequence are arranged in the outer cylinder;
the plurality of fluid collection tanks are for collecting natural gas in the core;
the measurement while drilling device is used for measuring the temperature and the pressure of the natural gas in the fluid collection tank; the measurement while drilling device comprises a TPMS electronic multi-point measurement while drilling device;
the device also comprises a suspension assembly, wherein one end of the suspension assembly is connected with the outer cylinder, and the other end of the suspension assembly is respectively connected with the measurement-while-drilling device, the plurality of fluid collecting tanks and the inner cylinder, so that when the outer cylinder rotates, the inner cylinder does not rotate;
the hydraulic mechanism is arranged in the outer barrel and used for controlling the opening and closing of the ball valve assembly; in the process of descending and drilling of the fluid closed coring device, the ball valve assembly is in an open state, and when coring, drilling and core cutting are finished, the hydraulic mechanism enables the inner cylinder and the outer cylinder to generate differential motion by means of the circulating pressure of drilling fluid, and the ball valve assembly is closed;
and a safety valve is arranged between the adjacent fluid collecting tanks, and a safety valve is arranged between the fluid collecting tank and the inner cylinder.
2. The shale fluid containment closed core apparatus of claim 1, wherein the suspension assembly comprises a bearing pack through which the plurality of fluid collection tanks, the measurement-while-drilling gauge and the inner barrel are suspended from an inner wall of the outer barrel.
3. The shale fluid containment closed core apparatus of claim 1, wherein the core bit has a piston bore at an end thereof, the piston bore having a closure piston disposed therein.
4. The shale fluid containment closed core apparatus of claim 3, wherein a pin is provided at a junction of the closed piston and the core bit.
5. A shale fluid containment closed core method using the shale fluid containment closed core apparatus as claimed in any of claims 1-4, the method comprising the steps of:
opening a ball valve assembly, putting the shale fluid-retaining closed coring device into a well, drilling a coring bit at a target layer position, allowing a rock core to enter an inner cylinder through the coring bit, and collecting natural gas in the rock core by a fluid collecting tank;
the measurement while drilling device continuously measures the temperature and pressure data of the natural gas collected in the fluid collection tank, and comprises a TPMS electronic multi-point measurement while drilling device;
the hydraulic mechanism is arranged in the outer cylinder and used for controlling the opening and closing of the ball valve assembly and lifting the drill after coring, and the hydraulic mechanism enables the inner cylinder and the outer cylinder to generate differential motion by the circulating pressure of drilling fluid and closes the ball valve assembly.
6. The shale fluid containment closed core extraction method of claim 5,
the end part of the coring bit is provided with a piston hole, and a closed piston is arranged in the piston hole;
the method further comprises the following steps:
before the ball valve assembly is opened, the closed piston is fixed in the piston hole of the coring bit through a pin, and the inner cylinder is filled with a closed liquid at a well mouth.
7. The shale fluid containment closed core extraction method of claim 5, further comprising:
and leading out the natural gas in the fluid collecting tank and the inner cylinder by using a gas guide tube, measuring, taking out the inner cylinder containing the rock core, freezing the inner cylinder containing the rock core by adopting liquid nitrogen, and then cutting and storing the inner cylinder and the rock core together.
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| CN201810745061.9A CN110700781B (en) | 2018-07-09 | 2018-07-09 | Shale fluid-retaining closed coring device and method |
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| CN201810745061.9A CN110700781B (en) | 2018-07-09 | 2018-07-09 | Shale fluid-retaining closed coring device and method |
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| CN111305837B (en) * | 2020-03-09 | 2023-02-10 | 中煤科工集团西安研究院有限公司 | Device and method for measuring content of shocking closed core-taking gas |
| CN112389889B (en) * | 2020-11-04 | 2021-09-10 | 中国科学院地质与地球物理研究所 | Device and method for closed pressure-maintaining transfer and storage of deep in-situ rock core |
| CN115822492B (en) * | 2022-09-09 | 2024-02-02 | 中国石油天然气集团有限公司 | Pressure maintaining coring tool, reservoir analysis system and reservoir analysis method |
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