CN110552643B - Fidelity sampling device applied to shale gas and method for thermally analyzing shale gas - Google Patents
Fidelity sampling device applied to shale gas and method for thermally analyzing shale gas Download PDFInfo
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- CN110552643B CN110552643B CN201910956167.8A CN201910956167A CN110552643B CN 110552643 B CN110552643 B CN 110552643B CN 201910956167 A CN201910956167 A CN 201910956167A CN 110552643 B CN110552643 B CN 110552643B
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- 238000005070 sampling Methods 0.000 title claims abstract description 170
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 75
- 230000007246 mechanism Effects 0.000 claims abstract description 73
- 238000004458 analytical method Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000002076 thermal analysis method Methods 0.000 claims description 25
- 238000009434 installation Methods 0.000 claims description 19
- 238000003795 desorption Methods 0.000 claims description 16
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- 239000011435 rock Substances 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 6
- 238000012546 transfer Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 54
- 238000005553 drilling Methods 0.000 description 12
- 238000012360 testing method Methods 0.000 description 8
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- 238000013461 design Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 239000010951 brass Substances 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 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
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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
- E21B25/02—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
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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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Sampling And Sample Adjustment (AREA)
Abstract
本发明公开了应用于页岩气的保真取样器具及热解析页岩气的方法，用以解决取样和岩心转移、解析的过程中，取样工具打捞到地表，目的层岩样的赋存环境已经发生变化，造成一部分气体从岩样中逸散，进而导致解析结果目的层位的含气量误差大的技术问题。本发明中保真取样器总成内集成有提拉机构，检测组件，其一端与提拉机构可拆卸的连接；取样组件，用以取样获得含页岩气的岩心；取样通路，其在检测组件与取样组件之间形成，检测组件用以检测取样通路内的压力和温度；保压组件具一打开状态和一封闭状态；其中打开状态用以实现取样通路可到达目的位置。
The invention discloses a fidelity sampling device applied to shale gas and a method for thermally decomposing shale gas, which are used to solve the problem of the occurrence environment of target layer rock samples when the sampling tool is salvaged to the surface in the process of sampling, core transfer and analysis. has changed, causing a part of the gas to escape from the rock sample, which in turn leads to the technical problem that the gas content in the target horizon of the analytical results has a large error. In the present invention, the fidelity sampler assembly is integrated with a pulling mechanism and a detection component, one end of which is detachably connected with the pulling mechanism; a sampling component is used for sampling to obtain cores containing shale gas; a sampling channel is used for detecting Formed between the assembly and the sampling assembly, the detection assembly is used to detect the pressure and temperature in the sampling passage; the pressure maintaining assembly has an open state and a closed state; the open state is used to realize that the sampling passage can reach the target position.
Description
Technical Field
The invention relates to the technical field of shale gas sampling and thermal desorption equipment, in particular to a fidelity sampling device applied to shale gas and a method for thermally desorbing the shale gas.
Background
Shale gas is an unconventional natural gas present in organic shale or mudstone, a portion of which exists in free form in natural fissures or pores of the formation, a portion of which is adsorbed on the surface of kerogen or clay particles, and a very small amount of which exists in dissolved form in kerogen or asphaltenes. In order to evaluate the content of the underground shale gas, drilling sampling becomes an indispensable technical means.
In the prior art, a mature rope coring technology is usually adopted to obtain a rock sample, and the sample taking rate can meet the test requirement. However, in the sampling and core analysis transferring processes, along with the fact that the sampling tool is salvaged to the ground surface, the occurrence environment of the target layer rock sample is changed greatly, a part of gas escapes from the rock sample, and further the analysis result cannot completely and truly reflect the gas content of the target layer. Aiming at the difficult problem, a fidelity sampling device applied to shale gas and a method for thermally analyzing the shale gas are developed by combining rope coring and the existing thermal analysis technology, on the basis of not changing the existing shale gas drilling operation procedure, the fidelity sampling and thermal analysis technology is adopted to ensure that a target stratum rock core is always at the pressure and the temperature of a sampling part in the sampling and analyzing transfer processes, the dissipation of the shale gas in the rock core is avoided, and the accuracy of analysis data is improved.
Disclosure of Invention
The invention provides a fidelity sampling device applied to shale gas and a method for thermally analyzing the shale gas, aiming at solving the technical problems that in the process of sampling and rock core analysis and transfer in the prior art, a sampling tool is fished to the earth surface, the occurrence environment of a target layer rock sample is changed, a part of gas escapes from the rock sample, and further the analysis result cannot completely and truly reflect the gas content of a target layer.
In order to solve the technical problems, the technical scheme of the invention is as follows:
in a first aspect, the present invention provides a fidelity sampling tool applied to shale gas, comprising:
fidelity sampler assembly, the integration has in the fidelity sampler assembly:
the lifting mechanism is arranged at the upper end of the fidelity sampler assembly and is used for obtaining a lifting force;
the detection assembly is detachably connected with one end of the lifting mechanism;
the sampling assembly is arranged at the lower end of the fidelity sampler assembly and is used for sampling to obtain a core containing shale gas;
wherein the sampling assembly and the detection assembly have a connected state and a separated state;
a sampling passage formed between the sensing assembly and the sampling assembly, the sensing assembly to sense pressure and temperature within the sampling passage;
the first end of the sampling passage can be communicated to the outside of the fidelity sampler assembly, so that the sampling assembly can acquire a rock core containing shale gas at a target position;
the pressure maintaining assembly is provided with an opening state and a closing state;
wherein the open state is used to enable the sampling access to reach the destination location;
the detection assembly and the sampling assembly are movably arranged, the lifting force drives the detection assembly and the sampling assembly to move, and after the detection assembly and the sampling assembly move for a preset distance, the pressure maintaining assembly can move from the opening state to the closing state;
the fidelity sampler has a first working state and a second working state, and after the lifting mechanism obtains the lifting force, the fidelity sampler enters the second working state from the first working state;
when the sampling mechanism is in the first working state, the detection assembly and the sampling assembly are in the connection state, the pressure maintaining assembly is in the open state, the sampling passage is communicated to the destination position, and the lifting mechanism is positioned inside the fidelity sampler assembly;
when the sampling passage is in the second working state, the lifting force moves the lifting mechanism to a preset position, part of the lifting mechanism moves out of the fidelity sampler assembly at the position, and the detection component moves towards the direction that the lifting mechanism moves towards the lifting mechanism, so that the sampling component moves and then separates, the action of the pressure maintaining component is realized, and the second end of the sampling passage is sealed.
Specifically, the fidelity sampler assembly includes:
the first end of the first connecting pipe is opened, and the other end of the first connecting pipe is provided with a spring clamping stop head;
the first end of the second connecting pipe is connected with one end of the first connecting pipe, which is provided with the elastic clamping stop head, through threads;
the first end of the second connecting pipe forms the ejection clamping chamber;
wherein the inner diameter of the cartridge chamber is larger than that of the second adapter tube.
Specifically, the method further comprises the following steps:
a third connection pipe;
the two ends of the upper reamer are provided with threads and are respectively connected with the second connecting pipe and the third connecting pipe;
a seat ring, a second end of the second adapter tube being partially connectable into the upper reamer;
the part, connected into the reamer, of one end, facing the seat ring, of the upper reamer and the second adapter part forms a first mounting space;
wherein the seat ring is mountable in the first mounting space with an outer circumference of the seat ring in contact with an inner circumference of the reamer;
wherein the seat ring end surface contacts with one end of the reamer where the first installation space is formed;
two ends of the under reamer are provided with threads,
the two ends of the lower reamer are respectively connected with the third connecting pipe and the coring bit;
the lower end of the third connecting pipe can be partially connected into the underreamer;
a second mounting space is formed in a part, connected into the under-reamer, of one end, facing the centralizing ring, of the under-reamer and the third adapter part;
wherein the centralizing ring is mountable in the second mounting space with an outer circumference of the centralizing ring in contact with an inner circumference of the under-reamer;
wherein an end surface of the centralizing ring contacts with one end of the underreamer, where the second installation space is formed.
Specifically, the pulling mechanism includes:
the rope fishing assembly is used for connecting the driving rope to provide a lifting force;
the single-action mechanism is used for connecting the rope fishing assembly at one end;
the rope fishing assembly is provided with a spring clamping end, and the spring clamping end is positioned at the spring clamping chamber in the first working state;
and the other end of the single-action mechanism is connected with the connecting piece through threads.
Specifically, the detection assembly includes:
sealing the joint;
the first end of the sealing joint is connected with the second end of the connecting piece through the shearing copper pin;
when the shearing copper pin is connected with the sealing joint and the connecting piece, the sampling assembly and the detection assembly can enter the connection state;
the shear copper pin can be disconnected and is used for enabling the sampling assembly and the detection assembly to enter the separation state when the shear copper pin is disconnected.
Specifically, the method further comprises the following steps:
the suspension ring is sleeved on the outer periphery of the sealing joint and is in contact with the inner periphery of the second connecting pipe;
the sealing middle pipe is connected to the second end of the sealing joint through threads;
wherein the suspension ring 23 contacts the end face of the seat ring 13 facing the rope fishing assembly 31 and generates an impact force which causes the shear bronze pin 21 to break.
Specifically, the detection assembly further comprises:
the recorder is used for recording temperature and pressure and is prefabricated in the sealing joint;
one end of the detection hose is connected with the recorder;
the other end of the detection hose is connected with a first end of the detection joint;
and a unhooking mechanism which is arranged in the sealed middle tube, is formed with a first passage, is connected with the detection joint and can move along with the detection assembly.
Specifically, the unhooking mechanism includes:
the second end of the detection joint is connected with the first end of the unhooking joint;
the hooking mechanism is connected to the second end of the unhooking connector and can be hooked with an unhooking spearhead;
the first passage is formed by the unhooking connector and communicated with the detection hose and the sealing middle pipe;
the second end of the sealing joint is provided with a clamping structure, and the hooking mechanism is provided with one end which can be partially clamped into the clamping structure and forms the preset position;
the sealing joint is matched and sealed with the unhooking joint at the preset position;
the other end of the hooking mechanism is used for being clamped into the clamping structure and then releasing the unhooking spearhead, so that the sampling assembly and the detection assembly are in a separated state;
and the moving distance of the hooking mechanism is the preset distance.
Specifically, the sampling assembly includes:
a sampling tube partially disposed within the sealed middle tube;
wherein the first end of the sampling tube is provided with the unhooking spearhead;
wherein, the inside of sampling tube is the second passageway, the second passageway with first passageway intercommunication.
Specifically, the pressure maintaining assembly includes:
a pressure retaining valve mounting pipe, the first end of which is connected to the second end of the sealing middle pipe through threads, and the outer periphery of which is in contact with the lower connecting pipe and the inner periphery of the lower reamer;
a pressure retaining valve;
a lower sealing joint into which a second end of the sampling tube may extend;
wherein, lower sealing joint orientation the boss body is constructed to the one end of pressure retaining valve installation pipe, the terminal surface of the boss body is connected through a pivot the pressure retaining valve to make but the pressure retaining valve lock is in on the boss body, in order to seal the second passageway.
In a second aspect, a method of thermally desorbing shale gas, comprising the steps of:
s101, the fidelity sampling device is salvaged to the ground surface and then is disassembled, and the disassembling mode is as follows:
disassembling the fidelity sampler assembly and lifting the mechanism;
at least reserving the part of the detection component and the sampling component to form the sampling passage and based on the sampling passage, using the sampling passage as a pressure maintaining chamber which is transversely arranged;
the pressure maintaining chamber at least comprises the following components:
the sealing joint, the suspension ring, the sealing middle pipe, the pressure retaining valve mounting pipe, the pressure retaining valve, the lower sealing joint, the hooking mechanism unhooking joint, the unhooking spearhead and the sampling pipe;
s102, setting the temperature and the pressure of the thermal analysis equipment based on the numerical value of the target position read by the detection assembly;
s103, before beginning thermal analysis, install the pressurize cavity in the analysis equipment to with pressurize intracavity portion and thermal analysis inner chamber UNICOM and pressure balance, the shale gas' S of being convenient for analysis, concrete mode includes:
the pressure retaining valve is pushed through a right lead screw, and then the sampling tube (39) is pushed, so that the sampling tube (39) and the thermal analysis equipment obtain a first communication state, and pressure retaining and sealing releasing are realized;
in the first communication state, opening a switch of the water outlet port to discharge the slurry in the pressure maintaining cavity, and closing the switch of the water outlet port after the slurry is completely discharged;
s104, pushing the detection joint and the unhooking joint to move rightwards through a left lead screw to enable the unhooking joint to be separated from the upper sealing joint so as to obtain a second communication state, and realizing pressure maintaining and sealing releasing;
s105, turning on a switch of a water inlet opening of the thermal analysis equipment, injecting hot water heated to the temperature of a sampling position into the thermal analysis equipment through the water inlet opening, turning on an air outlet opening to exhaust air in an inner cavity of the thermal analysis equipment until water emerges from an outlet opening of the air outlet opening, turning off the switch of the water inlet opening, stopping adding water, waiting for shale gas to escape from a rock core, and collecting the gas through the air outlet opening;
s106, detecting the temperature and pressure change of hot water in the inner cavity of the thermal desorption equipment through the pressure sensor and the temperature sensor, and timely replacing the hot water meeting the temperature requirement until the gas output reaches the requirement of stopping desorption.
The invention has the beneficial effects that:
the pressure holding test proves that the maximum pressure holding pressure of the shale gas fidelity sampling drilling tool can reach 25Mpa, shale gas in-situ sampling can be carried out in a well bore with the well depth not more than 2300m, meanwhile, a pressure holding cavity is utilized to carry out shale gas non-leakage transfer on a target stratum rock core, and thermal analysis is carried out in a movable thermal analysis device.
In the structural design, the following three beneficial innovations are provided:
(1) the fidelity sampling drilling tool adopts a modular design, has simple structure, few easily-damaged parts and convenient assembly and disassembly, and the pressure maintaining cylinder can be integrally disassembled for test analysis;
(2) the rope coring technology is adopted on the sampling method, and the rope coring technology can be exchanged with a common rope sampling drilling tool, so that the sampling operation efficiency is improved;
(3) thermal analysis equipment simple structure, convenient operation can carry out seamless butt joint with the pressurize cavity, avoids the loss of shale gas in the rock core, improves the precision of understanding and analyzing the data.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a fidelity sampling tool for shale gas according to the present invention;
FIG. 2 is a first enlarged view of the present fidelity sampling tool applied to shale gas;
FIG. 3 is a second enlarged view of the fidelity sampling tool of the present invention applied to shale gas;
FIG. 4 is a third enlarged view of the fidelity sampling tool applied to shale gas of the present invention;
FIG. 5 is a fourth enlarged view of the fidelity sampling tool of the present invention applied to shale gas;
FIG. 6 is a schematic view of a second operating state of the fidelity sampling tool applied to shale gas of the present invention;
FIG. 7 is a schematic view of the structure of the thermal analysis apparatus of the present invention;
FIG. 8 is a schematic view of a fidelity sampling tool of the present invention mounted on a thermal desorption apparatus.
The reference numerals in the figures denote:
the device comprises a fidelity sampler assembly 100, a lifting mechanism 10, a detection component 20, a sampling component 30, a sampling passage 40 and a pressure maintaining component 50;
the device comprises a first adapter tube 110, a second adapter tube 120, a spring clamping stop head 11, a spring clamping chamber 12, a third adapter tube 130, a seat ring 13, an upper reamer 14, a lower reamer 15 and a centering ring 16 of a core bit 17;
the rope fishing assembly 31, the single-action mechanism 32, the connecting piece 33, the sealing joint 22, the shearing copper pin 21, the hanging ring 23, the sealing middle pipe 24, the recorder 34, the detection hose 35, the detection joint 36, the unhooking joint 37, the unhooking spearhead 38 and the sampling pipe 39;
a pressure retaining valve mounting pipe 25, a pressure retaining valve 26, and a lower seal joint 27;
an air outlet interface A, a water inlet interface B, a pressure sensor C, a temperature sensor D and a water outlet interface E;
a left screw 41, a left seal joint 42, a resolving pipe 43, a right seal joint 44, and a right screw 45.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The directional descriptors described in this application are for clarity and completeness of description only with the first end of each component oriented above and the second end of each component oriented below as shown in the orientation of fig. 1.
The shale gas is salvaged to the earth surface by a sampling tool, the occurrence environment of a target stratum rock sample is greatly changed, a part of gas is diffused from the rock sample, and further the analytic result cannot completely and truly reflect the gas content of the target stratum. Based on this, the main objective of this application lies in the fidelity normal position sample for the rock specimen after the sample can keep the parameter when acquireing, avoids the loss of shale gas in the rock specimen, improves the accuracy of analysis and reserves evaluation.
Referring to fig. 1, a fidelity sampling apparatus for shale gas includes a fidelity sampler assembly 100, the fidelity sampler assembly 100 has integrated therein:
a pulling mechanism 10 disposed at an upper end of the fidelity sampler assembly 100 and configured to obtain a pulling force;
a detection assembly 20, one end of which is detachably connected with the lifting mechanism 10; the sampling assembly 30 is arranged at the lower end of the fidelity sampler assembly 100 and is used for sampling shale gas and a rock core; wherein, the sampling assembly 30 and the detecting assembly 20 have a connection state and a separation state;
a sampling passage 40 formed between the sensing member 20 and the sampling member 30, the sensing member 20 for sensing pressure and temperature within the sampling passage 40; wherein, a first end of the sampling passage 40 may be communicated to the outside of the fidelity sampler assembly 100, so that the sampling assembly 20 can obtain the core containing shale gas at the target position;
a pressure maintaining assembly 50 having an open state and a closed state; wherein, the open state is used to realize that the sampling passage 40 can reach the destination position; the detection component 20 and the sampling component 30 are movably arranged, and are driven by a lifting force to move, and after the detection component 20 and the sampling component move for a preset distance, the pressure maintaining component 50 can move from an open state to a closed state;
the fidelity sampler has a first working state and a second working state, and after the lifting mechanism 10 obtains the lifting force, the fidelity sampler enters the second working state from the first working state; in the first working state, the detection assembly 20 and the sampling assembly 30 are in a connected state, the pressure maintaining assembly 50 is in an open state, the sampling passage 40 is communicated to a target position, and the pulling mechanism 10 is positioned inside the fidelity sampler assembly 100;
in the second working state, the pulling force moves the pulling mechanism 10 to a predetermined position, and at this position, part of the pulling mechanism 10 moves out of the fidelity sampler assembly 100, and the detection component 20 moves towards the direction that the pulling mechanism 10 moves towards the pulling mechanism 10, so that the sampling component 30 moves and separates, thereby implementing the action of the pressure maintaining component 50, and closing the second end of the sampling passage 40.
In the technical scheme, in order to obtain sampling parameters, a detection assembly 20 is arranged, the detection assembly 20 is used for detecting temperature and pressure parameters of sampling, the pressure maintaining assembly 50 is arranged for maintaining pressure after sampling so as to ensure the consistency of the parameters before sampling and after sampling, and the detection assembly 20 can detect a target position by arranging a sampling passage 40; specifically, the first operating state may be understood as a state during sampling, in which the detection assembly 20 and the sampling assembly 30 are in a connected state, the pressure maintaining assembly 50 is in an open state, the sampling passage 40 is communicated to a destination, and the pulling mechanism 10 is located inside the fidelity sampler assembly 100; the lifting mechanism 10 starts to drive each component to work after obtaining the lifting force, so that the whole fidelity sampling device enters a second working state, the detection component 20 and the sampling component 30 are changed from a connection state to a separation state, and the main purpose of the device is to realize the action of the pressure maintaining component 50 to seal the second end of the sampling passage 40, so that the sampling passage 40 is sealed to form pressure maintaining. It can be understood that, by the above method, the sampling mode of the lifting mechanism 10 is improved without changing, so that the fidelity in-situ sampling can be realized, the sampled rock sample can keep the parameters during acquisition, the dissipation of shale gas in the rock sample is avoided, and the accuracy of analysis and reserve evaluation is improved.
In one embodiment, and as shown in fig. 1-5, fidelity sampler assembly 100 includes: a first adapter tube 110 having a first end opened and the other end formed with a snap stopper 11; a second adapter 120, a first end of which is connected with the end of the first adapter 110 having the elastic catch 11 by a screw thread; the ejection chamber 12 is formed by the first end of the second connecting pipe 120; wherein the inside diameter of the latch chamber 12 is larger than the inside diameter of the second adapter tube 120.
In one embodiment, please refer to fig. 1-5, which further includes: a third adapter 130; an upper reamer 14 having threads at both ends thereof and respectively connected to the second adapter tube 120 and the third adapter tube 130; a seat ring 13, a second end of the second adapter 120 being partially insertable within the upper reamer 14; wherein, a first installation space is formed between the end of the upper reamer 14 facing the seat ring 13 and the part of the second adapter 120 partially connected into the reamer 14; wherein the seat ring 13 is mountable in the first mounting space with an outer circumference of the seat ring 13 contacting an inner circumference of the reamer 14; wherein, the end surface of the seat ring 13 is contacted with one end of the reamer 14 which forms a first installation space; the lower reamer 15 is provided with threads at two ends thereof, the coring bit 17, and the two ends of the lower reamer 15 are respectively connected with the third connecting pipe 130 and the coring bit 17; a centralizing ring 16, the lower end of the third adapter 130 being partially attachable into the underreamer 15; wherein, a second installation space is formed between one end of the under-reamer 15 facing the centralizing ring 16 and the part of the third adapter 130 partially embedded in the under-reamer 15; wherein, the righting ring 16 can be installed in the second installation space, and the outer circumference of the righting ring 16 is in contact with the inner circumference of the lower reamer 15; wherein the end surface of the centralizing ring 16 is in contact with the end of the lower reamer 15 where the second installation space is formed.
In one embodiment, and as shown in fig. 1-5, the pulling mechanism 10 includes: a rope fishing assembly 31 for connecting a driving rope to provide a lifting force; a single-acting mechanism 32, one end of which is used for connecting the rope fishing component 31; wherein, the rope fishing component 31 has a snapping end 310, and in the first working state, the snapping end 310 is located at the snapping chamber 12; the other end of the single-action mechanism 32 is connected with the connecting piece 33 through screw threads.
In one embodiment, referring to fig. 1-5, the sensing assembly 20 includes: a sealing joint 22; the first end of the sealing joint 22 is connected with the second end of the connecting piece 33 through the shearing copper pin 21; when the shearing copper pin 21 is connected with the sealing joint 22 and the connecting piece 33, the sampling assembly 30 and the detection assembly 20 can enter a connecting state;
in one embodiment, the shear copper pin 21 is configured to be broken and, when broken, to separate the sampling assembly 30 from the detection assembly 20.
In one embodiment, please refer to fig. 1-5, which further includes: a suspension ring 23 fitted around the outer circumference of the sealing joint 23 and contacting the inner circumference of the second adapter tube 120; a sealing middle tube 24 is threadedly attached to the second end of the sealing nipple 22. Wherein the suspension ring 23 contacts the end face of the seat ring 13 facing the rope fishing assembly 31 and generates an impact force which causes the shear brass pin 21 to break.
In one embodiment, referring to fig. 1-5, the detecting element 20 further includes: a recorder 34 for recording temperature, pressure, and prefabricated within the sealing joint 22; a detection hose 35 having one end connected to the recorder 34; a detection joint 36, wherein the other end of the detection hose 35 is connected with a first end of the detection joint 36; and a unhooking mechanism disposed within the sealed middle tube 24, forming a first passageway 401, and connected to the test sub 36 and movable with the test assembly 20.
In one embodiment, and referring to fig. 1-5, in one embodiment, the unhooking mechanism comprises: a unhooking joint 37, wherein the second end of the detection joint 36 is connected with the first end of the unhooking joint 37; a hooking mechanism connected to a second end of the unhooking joint 37, the hooking mechanism being capable of hooking and connecting with a unhooking spearhead 38; wherein, the unhooking joint 37 constructs a first passage 401, and the first passage 401 is communicated to communicate the detection hose 35 and the sealing middle pipe 24; wherein, the second end of the sealing joint 22 forms a clamping structure 220, and the hooking mechanism is formed in such a way that one end of the hooking mechanism can be partially clamped into the clamping structure 220 and forms a preset position; and in this preset position the sealing joint 22 is in sealing engagement with the unhooking joint 37. The other end of the hooking mechanism is configured to be clamped into the clamping structure 220 and then release the unhooking spearhead 38, so that the sampling assembly 30 and the detection assembly 20 are separated; wherein, the distance that colludes link mechanism removal is preset distance.
In one embodiment, and as shown in FIGS. 1-5, sampling assembly 30 includes: a sampling tube 39 partially disposed within the sealed middle tube 24; wherein a first end of the sampling tube 39 is provided with a unhooking spearhead 38; the sampling tube 39 has a second passage 402 therein, and the second passage 402 communicates with the first passage 401.
In one embodiment, and as shown in fig. 1-5, the pressure maintaining assembly 50 includes: a pressure retaining valve installation tube 25 having a first end screwed to a second end of the sealing middle tube 24 and an outer circumference contacting the lower connection tube 130 and an inner circumference of the lower reamer 15; a pressure retaining valve 26; a lower sealing joint 27 into which a second end of the sampling tube 39 can extend; wherein, the one end of lower sealing joint 27 towards pressure retaining valve installation pipe 25 is constructed into the boss body, and the terminal surface of the boss body passes through a pivot hub connection pressure retaining valve 26 to make pressure retaining valve 26 lock on the boss body, with closed second passageway 402.
In the technical scheme, in the actual application, before the fidelity sampling device goes into the well, the first end of the sealing joint 22 is connected with the second end of the connecting piece 33 through the shearing copper pin 21; the sampling tube 39 is prevented from being recovered inside the sealed middle tube 24 due to the relative sliding between the detection assembly 20 and the sampling assembly 30 during the putting process of the drilling tool. During the drill tool launch, the sensing assembly 20 and the sampling assembly 30 fall within the drill pipe central bore at a relatively static rate.
When the suspension ring 23 first touches the seat rings 1-3 to stop moving, at the moment, the downward movement speed is also provided under the action of gravity, so that an impact force is generated between the detection assembly 20 and the sampling assembly 30, the connecting piece 33 and the shearing copper pin 21 at the upper sealing joint 22 are sheared, then the elastic clamp on the rope fishing assembly 31 is opened to be matched with the suspension ring 23, the elastic clamping chamber 12 and the seat ring 13 to form axial positioning, and the drilling tool is prevented from moving up and down in the drilling and coring process.
When the second working state is entered, the rope fishing assembly 31 is pulled upward, and the single action mechanism 32, the connecting member 33, the recorder 34, the detection hose 35, the detection joint 36, the unhooking joint 37, the unhooking spearhead 38 and the sampling tube 39 are moved upward. At this time, when the lower end of the sampling tube 39 passes over the pressure retaining valve 26, the pressure retaining valve 26 is automatically closed under the action of gravity, the lower end is sealed, meanwhile, the unhooking joint 37 moves into the inner hole of the upper sealing joint 22 on the middle tube assembly 2,
wherein, the second end of the sealing joint 22 forms a clamping structure 220, the hooking mechanism is configured such that one end thereof can be partially clamped into the clamping structure 220, which is equivalent to form a preset position, and the moving distance of the hooking mechanism is a preset distance. And pressure maintaining sealing is realized through the sealing ring.
At the same time, the other end of the release mechanism is configured to release the release spear 38 after the snap-fit structure 220 is snapped into place to separate the sampling assembly 30 from the testing assembly 20, and the release spear 38 and the sampling tube 39 and internal core drop together to the pressure retention valve 26. Further carry to draw and drag for rope fishing assembly 31 and realize the bullet card and contract the unfreezing, realize the salvage of fidelity sample drilling tool.
Referring to fig. 7-8, a method for thermally desorbing shale gas comprises the steps of:
s101, salvaging the fidelity sampling device to the ground surface and then disassembling, wherein the disassembling mode is as follows:
disassembling the fidelity sampler assembly 100 and lifting the mechanism 10;
at least part of the detecting component 20 and the sampling component 30 are reserved to form a sampling passage 40 and are used as pressure maintaining chambers on the basis of the sampling passage, and the pressure maintaining chambers are transversely arranged;
the pressure maintaining chamber at least comprises the following components:
the device comprises a sealing joint 22, a suspension ring 23, a sealing middle pipe 24, a pressure retaining valve mounting pipe 25, a pressure retaining valve 26, a lower sealing joint 27, a hooking mechanism unhooking joint 37, a unhooking spearhead 38 and a sampling pipe 39;
s102, setting the temperature and the pressure of the thermal analysis equipment based on the numerical value of the target position read by the detection component 20;
s103, before beginning thermal analysis, install the pressurize cavity in the analysis equipment to with pressurize intracavity portion and thermal analysis inner chamber UNICOM and pressure balance, the shale gas' S of being convenient for analysis, concrete mode includes:
the pressure retaining valve 26 is pushed through a right lead screw 45, and then the sampling tube 39 is pushed, so that the sampling tube 39 and the thermal analysis equipment obtain a first communication state, and pressure retaining and sealing releasing are realized;
in the first communication state, opening a switch of the water outlet port E to discharge the slurry in the pressure maintaining cavity, and closing the switch of the water outlet port E after the slurry is completely discharged;
s104, pushing the detection joint 36 and the unhooking joint 37 to move rightwards through a left lead screw 41, and enabling the unhooking joint 37 to be separated from the upper sealing joint 22 to obtain a second communication state so as to realize pressure maintaining and sealing releasing;
s105, opening a switch of a water inlet interface B of the thermal analysis equipment, injecting hot water heated to the temperature of a sampling position into the thermal analysis equipment through the water inlet interface B, opening an air outlet interface A to exhaust air in an inner cavity of the thermal analysis equipment until water emerges from an outlet of the air outlet interface A, closing the switch of the water inlet interface B, stopping adding water, waiting for shale gas to escape from a rock core, and collecting the gas through the air outlet interface A;
s106, detecting the temperature and pressure change of hot water in the inner cavity of the thermal desorption equipment through the pressure sensor C and the temperature sensor D, and timely replacing the hot water meeting the temperature requirement until the gas output reaches the requirement of stopping desorption.
In this technical scheme, in order to guarantee that the method of thermal desorption shale gas can be applied to the fidelity sampling utensil cooperation use of shale gas, still include a thermal desorption equipment, specifically include:
a resolving pipe 43 having both ends connected to a left sealing joint 42 and a right sealing joint 44 by threads, respectively;
the left and right seal joints 42 and 44 have left and right communication holes, respectively;
the left screw rod 41 is connected in the left communicating hole in a screwing manner, and the right screw rod 45 is connected in the right communicating hole in a screwing manner; the device also comprises an air outlet port A, a water inlet port B, a pressure sensor C, a temperature sensor D and a water outlet port E which are communicated with the analysis tube 43.
The pressure holding test proves that the maximum pressure holding pressure of the shale gas fidelity sampling drilling tool can reach 25Mpa, shale gas in-situ sampling can be carried out in a well bore with the well depth not more than 2300m, meanwhile, a pressure holding cavity is utilized to carry out shale gas non-leakage transfer on a target stratum rock core, and thermal analysis is carried out in a movable thermal analysis device.
In the structural design, the following three beneficial innovations are provided: the fidelity sampling drilling tool adopts a modular design, has simple structure, few easily-damaged parts and convenient assembly and disassembly, and the pressure maintaining cylinder can be integrally disassembled for test analysis; the rope coring technology is adopted on the sampling method, and the rope coring technology can be exchanged with a common rope sampling drilling tool, so that the sampling operation efficiency is improved; thermal analysis equipment simple structure, convenient operation can carry out seamless butt joint with the pressurize cavity, avoids the loss of shale gas in the rock core, improves the precision of understanding and analyzing the data.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
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