CN108894742B - Coal bed gas reservoir parameter measuring method and packer fixing tool - Google Patents
Coal bed gas reservoir parameter measuring method and packer fixing tool Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012360 testing method Methods 0.000 claims abstract description 88
- 239000012530 fluid Substances 0.000 claims abstract description 18
- 210000000078 claw Anatomy 0.000 claims description 30
- 238000005259 measurement Methods 0.000 claims description 29
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 26
- 238000002347 injection Methods 0.000 claims description 25
- 239000007924 injection Substances 0.000 claims description 25
- 238000011161 development Methods 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
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- 230000008602 contraction Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011981 development test Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000013208 measuring procedure Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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- 238000010998 test method 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/06—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/006—Measuring wall stresses in the borehole
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Abstract
The invention relates to a coal bed gas reservoir parameter measuring method and a packer fixing tool. The measuring method and the packer fixing tool change the bottom hole pressure of the test well by fracturing the reservoir of the test well, start pressure drop test by closing the well after a period of time of injecting fluid with stable discharge capacity, read out the pressure data recorded by the pressure gauge, and analyze by professional analysis software to obtain the parameters of the reservoir of the coal bed gas.
Description
Technical Field
The invention relates to a reservoir parameter testing method and a packer fixing tool, belongs to the technical field of parameter measurement in coal bed gas exploration and development, and particularly relates to a coal bed gas reservoir parameter measuring method and a packer fixing tool.
Background
In the existing coal bed gas reservoir parameter measurement, coal reservoir parameters are mainly determined through single-well parameter measurement, a packer is set to a specified preset position, meanwhile, a ground winch is adopted by a testing tool to place an underground measuring tool into the bottom of a well, in the common coal bed gas parameter measurement process, the ground winch places the measuring tool into the bottom of the well through a steel wire, and in the measuring process, the position of the measuring tool is determined according to requirements. After the measurement is finished, the measurement tool put into the well is taken out of the well, the measurement process generally lasts for at least 3 days, the geological conditions are more and more complex along with the continuous deep exploration degree of the coal bed gas, the exploration difficulty is increased, and most of the interpretation of the measured well test data of the measurement well cannot obtain a 'unique solution'. After the measurement of the measurement well is finished, the packer can not be unsealed due to long measurement time and poor measurement geological conditions, accidents of the parameter well and the exploration well are caused, the parameter well and the exploration well are scrapped under the most serious condition, and irreparable economic loss is caused to a investor. On the other hand, in the traditional coal bed gas parameter measuring process, the measuring procedure of the tool is complicated, and the risk of accidents such as the clamping of the well closing tool is easy to occur. With the continuous expansion of the development and utilization of the coal bed gas industry, the traditional parameter test of the coal bed gas cannot meet the requirements of increasingly developed exploration and development, so that a novel rapid coal bed gas reservoir parameter test method is developed on the basis of the traditional coal bed gas parameter measurement technology, and the defect of the traditional coal bed gas test is overcome.
The basic idea of the new invention is that after the coal bed is fractured, fluid is stably injected into the coal bed to change and recover the bottom hole pressure, a pressure gauge is used for measuring pressure data, and the test data is analyzed to determine the basic parameters of the coal bed. The method simplifies the technical process of the traditional coal bed gas well testing, reduces the testing time to the greatest extent, and avoids the risk of the traditional well testing as much as possible. The method increases the efficiency of coal bed parameter testing and optimizes the testing technology, thereby making up the defects of the traditional injection pressure drop well testing method and perfecting and promoting the technology of the coal bed gas coal bed parameter testing method.
Disclosure of Invention
The invention mainly solves the technical problems of long measuring time, incapability of generating 'unique solution' in test data interpretation and easiness in clamping in the measuring process to cause abandonment of an exploration well in the prior art, and provides a coal bed methane reservoir parameter measuring method and a packer fixing tool. The measuring method and the packer fixing tool change the bottom hole pressure of the test well by fracturing the reservoir of the test well, start pressure drop test by closing the well after a period of time of injecting fluid with stable discharge capacity, read out the pressure data recorded by the pressure gauge, and analyze by professional analysis software to obtain the parameters of the reservoir of the coal bed gas.
The technical problem of the invention is mainly solved by the following technical scheme:
a coal bed methane reservoir parameter measurement packer fixing tool, includes:
the main body structure is matched with the shape of the test well;
the packer fixing telescopic claw is arranged on the peripheral side wall of the main body structure and is provided with a pressurizing hole and a pressure relief hole, and when the pressure is applied to the packer fixing telescopic claw through the pressurizing hole, the packer fixing telescopic claw expands and/or stretches in the direction far away from the periphery of the main body structure in the plane where the main body structure is located.
In at least one embodiment of the invention, the packer fixing telescopic claws are arranged on the circumference thereof.
In at least one embodiment of the present invention, the body structure comprises:
the packer comprises an inner cylinder body, wherein a first circular ring structure is arranged on the side surface of the inner cylinder body, and a plurality of guide grooves communicated with the packer fixing telescopic claws are respectively arranged on the upper surface and the lower surface of the first circular ring structure along the radius direction;
the connecting buckle comprises an upper connecting buckle and a lower connecting buckle of an annular structure, the upper connecting buckle and the lower connecting buckle are detachably arranged on the first annular structure respectively, and the diversion trench and one surface of the connecting buckle form the pressurizing hole or the pressure relief hole.
A coalbed methane reservoir parameter measurement method comprises the following steps:
a fracturing step, namely, after a packer is put to a preset underground deep bottom, injecting fluid into the underground to fracture a reservoir stratum of the test well;
and a pressure measuring step, injecting fluid at a stable discharge amount for a period of time after fracturing the reservoir and recording, and then closing the well and recording the change of the downhole pressure signal.
And analyzing, namely analyzing to obtain the parameters of the coal bed methane reservoir according to the pressure signal change.
In at least one embodiment of the invention, the fracturing step is preceded by a fracture preparation step,
the fracture preparation step further comprises:
a parameter determination substep, namely estimating basic parameters of a test layer according to geological and extraction data of the region, analyzing exploration and development wells in the region and determining measurement parameters of a reservoir;
a test preparation substep, determining the setting position of the packer according to the logging result and the fracturing depth;
a well sealing pressure test substep, wherein a packer is connected on the ground, a pipe column is measured, the actual depth of the setting of the packer is determined, and after the pipe column is put into the well, the pipe column is subjected to a pressure test to eliminate leakage;
in at least one embodiment of the invention, in the sub-step of well-sealing and pressure testing, after the packer seat is sealed, an inner tool of the packer fixer is lowered, the inner tool is connected with the packer fixer, the telescopic claw of the packer fixer extends the water guide hole to press, the telescopic claw of the packer fixer is expanded and fixed on the inner wall of the shaft, the inner tool of the packer fixer is lifted out, and the fixation of the test packer seat and the packer fixer is completed.
In at least one embodiment of the invention, the discharge capacity is adjusted according to the actual geological conditions of the coal bed gas parameter test well and the thickness of the reservoir, the fracturing pressure is kept between 15 and 25MPa, and the discharge capacity is kept between 0.5 and 1.65m3/mins。
In at least one embodiment of the invention, the stable displacement injection is carried out after fracturing the reservoir, the injection time is 40-150 minutes, and the displacement is more than 2.5m3The above.
In at least one embodiment of the invention, after the injected fluid is stabilized, the well is shut down downhole, and a drawdown test of the reservoir is started, wherein the drawdown shut-in time is generally controlled to be 2.5-4 times the fluid injection time.
Therefore, the invention has the following advantages:
1. the packer setting fixer for measuring the coal bed gas is directly connected with the lower well, so that the defects of poor setting effect of the traditional packer and packer deblocking in the measuring process are overcome; four groups of telescopic claws are fixed on the inner wall of a shaft in the working state of the device, so that a system is not influenced by the difference of the upper pressure and the lower pressure in the measuring process; the screw thread in the packer setting fixer for measuring the coal bed gas is processed and designed according to tubular columns with different specifications, and is suitable for measuring the coal bed gas parameters in different coal bed gas well cylinders.
2. The method changes the traditional coal bed gas measuring mode, and changes from the traditional reservoir which can not be fractured into the fractured reservoir; the damage of slurry to the reservoir or pollution caused by later construction is reduced by a fracturing mode, and meanwhile, the accuracy of coal reservoir parameter measurement is improved; the measurement mode of the invention is therefore the most direct and effective method for the coal bed gas development reservoir recognition and development.
3. The method can determine the basic parameters of the coal bed gas reservoir of the exploration and development well, and has shorter time and more accurate measured data analysis result compared with the traditional measuring method; therefore, the technical means can better provide the productivity detection in the coal bed gas exploration area and the basic characteristics of the basic parameters of the reservoir.
Drawings
FIG. 1 is a schematic top view of the packer construction of the present invention.
FIG. 2 is a schematic front view of the packer construction of the present invention.
In the figure: 1. the packer comprises an upper connecting buckle, a lower connecting buckle, 2, a packer fixing telescopic claw, 3, a telescopic claw extending water guide hole and 4, a telescopic claw contracting water drain hole.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
the basic scheme of the embodiment is that in a coal bed gas exploration and development test well, a packer setting fixer connected with coal bed gas measurement is determined, a measurement pipe column is connected and is lowered to a specified position, other equipment for measurement is connected, then the packer and the packer setting fixer are expanded, and the pressure bearing capacity of the packer setting fixer can reach 28MPa generally. After the setting of the underground packer and the fixation of the packer fixer are finished, a high-precision pressure gauge detection tool is put down to a specified position in the well in a measuring well; and fracturing the coal bed in the test well by using a large-discharge fluid to enable the coal bed to be in a crack expansion state. After the coal seam is pressed, fluid is injected into the coal seam at a stable discharge rate, and the injection time is 40-150 minutes generally. The pressure change in the test well is recorded by a high precision manometer detection tool. And (4) carrying out a pressure drop test along with the well shut-in at the bottom of the well, wherein the pressure drop test time is generally 2.5-4 times of the injection stable discharge time. And after the measurement is finished, analyzing the pressure change data through the well testing analysis software to obtain the coal bed parameter measurement result of the coal bed gas test well.
The specification of the upper and lower connecting screw threads of the packer setting fixer for coal bed gas measurement can be processed and designed according to different tubular columns, and the packer setting fixer is suitable for different coal bed gas test shafts; the upper part and the lower part of the measuring downward connector can be connected with measuring tools through screw threads, and can also be connected according to measuring tools with different specifications; the expansion telescopic claw of the packer setting fixer can be inserted into a coal-bed gas well cylinder, so that the fixer is firmly fixed on the inner wall of the well cylinder, and meanwhile, the setting of the packer is firmer; the stability of the setting of the packer in the measuring process is ensured.
In the embodiment, the test well is injected and measured for a period of time after fracturing the reservoir, and then the well is closed for testing, so that the problems caused by traditional single-well parameter test mud and later construction are avoided, the communication between the shaft and the reservoir is more smooth after fracturing, and the recognition degree of the coal bed methane reservoir is greatly improved.
The method changes the technical mode of the traditional coal bed gas measurement, optimizes the defects of the traditional measurement and combines the advantages of the in-situ stress and the injection pressure drop measurement; and determining the coal reservoir parameters of the exploration and development area through measuring and analyzing the data.
The rapid coal bed gas reservoir parameter testing method simplifies the traditional coal bed gas testing procedure and greatly shortens the traditional coal bed gas exploration, development and determination time.
The packer of this embodiment is shown in figures 1-2,
the method comprises the following steps: the main body structure is matched with the shape of the wellhead;
the packer fixing telescopic claw is arranged on the peripheral side wall of the main body structure and is provided with a pressurizing hole and a pressure relief hole, and when the pressure is applied to the packer fixing telescopic claw through the pressurizing hole, the packer fixing telescopic claw expands and/or stretches in the direction far away from the periphery of the main body structure in the plane where the main body structure is located.
In this embodiment, the main structure is a circular structure, and the packer fixing telescopic claws are arranged on the circumference of the packer fixing telescopic claws. The main body structure comprises:
the packer comprises an inner cylinder body, wherein a first circular ring structure is arranged on the side surface of the inner cylinder body, and a plurality of guide grooves communicated with the packer fixing telescopic claws are respectively arranged on the upper surface and the lower surface of the first circular ring structure along the radius direction;
the connecting buckle comprises an upper connecting buckle and a lower connecting buckle of an annular structure, the upper connecting buckle and the lower connecting buckle are detachably arranged on the first annular structure respectively, and the diversion trench and one surface of the connecting buckle form the pressurizing hole or the pressure relief hole.
The following steps further illustrate the testing method of this embodiment. The testing step of this embodiment specifically includes the following steps:
the first step is as follows: determining the basic data of the measurement well
Comprehensively analyzing according to the geological and drainage and mining data of the region, estimating basic parameters of a test layer, and comprehensively analyzing exploration and development wells in the region; and determining a measured parameter of the reservoir.
The second step is that: preparation before coal bed gas parameter test
The performance of test equipment, instruments, pressure gauges and the like is tested, and the test equipment, the instruments, the pressure gauges and the like can be used after being qualified; inspecting and maintaining the test equipment; assembling the packer on the ground; determining the setting position of the packer according to the logging result and the fracturing depth; a packer setting fixer is connected below the packer; connecting a well descending test pipe column on the ground, and recording the name, the size and the length of each part; and (4) organizing construction and related cooperative personnel to give up test attention and divide labor, and ensuring that the test is carried out smoothly.
The third step: packer pipe column well descending and pipe column pressure testing for coal bed gas parameter testing
The ground is connected with a well maintained packer; a packer setting fixer is connected below the packer, the pipe column is measured, and the actual depth of the packer setting is determined; in the process of lowering the pipe column into the well, the pipe column is kept stable, the pipe column is prevented from being lowered when being hard when meeting a blockage, if the reason needs to be found when meeting the blockage, the pipe column is tested and lowered into the well again after being removed; and (3) well setting the pipe column, and carrying out pressure test on the pipe column, wherein the test pressure is 7-15 MPa, and the pressure is stabilized for 30 minutes to be qualified. If leakage is found, the pressure test should be carried out again after the reason is found.
The fourth step: packer setting of coal bed gas parameter testing well and use method of packer fixing device
The drilling fluid in the test string and in the wellbore below the packer is replaced with injection water. And (3) throwing balls, setting a packer, wherein the setting of the packer is stable, and the setting pressure is not lower than 15 MPa. After the packer is sealed, an inner tool of the packer fixer is lowered, the inner tool is connected with the packer fixer, the telescopic claw of the packer fixer extends to form a water guide hole to be pressed, the telescopic claw of the packer fixer is expanded and fixed on the inner wall of the shaft, the inner tool of the packer fixer is pulled out, and the fixation of the packer seat seal and the packer fixer is tested.
The fifth step: large-displacement fracturing reservoir of coal bed gas parameter testing well
And (3) according to the actual geological conditions of the coal bed gas parameter testing well and the thickness of the reservoir, adjusting the discharge capacity, observing the change of injection pressure, ensuring that the reservoir is fractured as fast as possible in the injection fracturing process, and observing and recording the ground pressure and the discharge capacity at any time. The fracturing state of the reservoir can be judged according to the pressure and the discharge capacity, the fracturing pressure is generally 15-25MPa, and the discharge capacity is generally 1.5-5 m3But both will vary differently from reservoir to reservoir.
And a sixth step: coal bed gas parameter test well injection test
After fracturing a reservoir, adjusting according to the designed injection displacement, observing the change of injection pressure, and selecting proper displacement for injection, wherein the injection displacement is kept stable as much as possible. After fluid is injected into a reservoir for a period of time, the discharge capacity is adjusted according to the thickness of the reservoir and basic geological conditions, the discharge capacity adjusting time is not more than one third of the total design injection time, then discharge capacity injection is stabilized, the injection time is generally controlled to be 40-150 mins, and the discharge capacity is generally more than 2.5m3The above. And recording well head pressure, injection displacement and accumulated injection amount, wherein the recording time interval is not more than 3 minutes.
The seventh step: coal bed gas parameter testing well pressure drop test
And after the injected fluid is stable, shutting down the well underground, and starting a pressure drop test of the reservoir, wherein the pressure drop shut-down time is generally controlled to be 2.5-4 times of the fluid injection time. The downhole pressure gauge will record the pressure changes during the injection and drawdown tests.
Eighth step: and after the shut-in pressure drop test is finished, taking out the high-precision pressure gauge for testing the coal bed gas. And analyzing the reservoir by professional pressure analysis software to obtain basic parameters of the reservoir.
The ninth step: and (4) lowering the tool in the packer fixing device, pressing the telescopic claw which contracts the packer fixing device, and pulling out the tool in the packer fixing device to finish the contraction of the packer fixing device.
The tenth step: unsealing the packer in the coal bed gas parameter testing well, and taking out the testing pipe column; and completing the novel rapid parameter test of the coal bed gas reservoir.
The working principle of the embodiment is as follows: selecting a coal bed gas test well in a development area, fracturing a reservoir of the test well, changing the bottom hole pressure of the test well, closing the well after a period of time of injecting fluid with stable discharge capacity, starting a pressure drop test, recording the change of a pressure signal in the well by using a high-precision pressure gauge of the coal bed gas test well, taking out a measuring pipe column after the measurement is finished, taking out the high-precision pressure gauge of the coal bed gas test well from the well, reading pressure data recorded by the pressure gauge, and analyzing the recorded data by using professional analysis software to obtain the parameters of the coal bed gas reservoir; meanwhile, the novel rapid coalbed methane reservoir parameter testing equipment is maintained so as to facilitate the next test.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. A coalbed methane reservoir parameter measurement method is characterized by comprising the following steps:
setting, namely setting the packer by throwing a ball to set the packer after the packer is put to a preset underground deep bottom; wherein, a packer fixing tool is connected below the packer; the packer fixing tool includes: the main body structure is matched with the shape of the wellhead; the packer fixing telescopic claw is arranged on the side wall of the periphery of the main body structure and is provided with a pressurizing hole and a pressure relief hole, and when the packer fixing telescopic claw is pressurized through the pressurizing hole, the packer fixing telescopic claw expands and stretches in the direction away from the periphery of the main body structure in the plane of the main body structure;
a fixing step, namely, lowering a tool in the packer fixer, wherein the tool in the packer is connected with the packer fixing tool, and the telescopic claw of the packer fixing tool extends a water guide hole to press, so that the packer fixing telescopic claw of the packer fixer is stretched and fixed on the inner wall of a shaft, and the tool in the packer fixer is pulled out to finish the test of the seat seal of the packer and the fixation of the packer fixer;
a fracturing step, namely, after a packer is put to a preset underground deep bottom, injecting fluid into the underground to fracture a reservoir stratum of the test well;
a pressure measuring step, wherein the change of the pressure signal under the well is recorded after the fluid injection is stopped;
analyzing, namely analyzing to obtain coal bed methane reservoir parameters according to the pressure signal change;
the main body structure is a circular structure, and the packer fixing telescopic claws are arranged on the circumference of the main body structure;
the main body structure comprises: the packer comprises an inner cylinder body, wherein a first circular ring structure is arranged on the side surface of the inner cylinder body, and a plurality of guide grooves communicated with the packer fixing telescopic claws are respectively arranged on the upper surface and the lower surface of the first circular ring structure along the radius direction;
the connecting buckle comprises an upper connecting buckle and a lower connecting buckle of an annular structure, the upper connecting buckle and the lower connecting buckle are detachably arranged on the first annular structure respectively, and the diversion trench and one surface of the connecting buckle form the pressurizing hole or the pressure relief hole.
2. A method of measuring parameters of a coalbed methane reservoir according to claim 1, characterized in that the fracturing step is preceded by a fracturing preparation step, and the fracturing preparation step further comprises:
a parameter determination substep, namely estimating basic parameters of a test layer according to geological and extraction data of the region, analyzing exploration and development wells in the region and determining measurement parameters of a reservoir;
a test preparation substep, determining the setting position of the packer according to the logging result and the fracturing depth;
and a well sealing pressure test substep, wherein a packer is connected to the ground, the pipe column is measured, the actual depth of the setting of the packer is determined, and after the pipe column is put into the well, the pipe column is subjected to a pressure test to eliminate leakage.
3. The method for measuring parameters of a coal bed methane reservoir according to claim 2, wherein in the sub-step of well-sealing and pressure testing, after the packer seat is sealed, an inner tool of the packer fixer is lowered, the inner tool is connected with the packer fixer, the telescopic claw of the packer fixer extends to a water guide hole to carry out pressurization, so that the telescopic claw of the packer fixer is expanded and fixed on the inner wall of the shaft, the inner tool of the packer fixer is lifted out, and the fixation of the packer seat and the packer fixer is tested.
4. The method for measuring parameters of a coalbed methane reservoir as claimed in claim 1, wherein in the fracturing step, the discharge capacity is adjusted according to the actual geological conditions of a coalbed methane parameter test well and the thickness of the reservoir, and the fracturing pressure is kept between 15 and 25 MPa.
5. A coalbed methane reservoir parameter measurement method according to claim 4, characterized in that in the fracturing step, after fracturing the reservoir, the stable discharge capacity is injected, the injection time is 40-150 minutes, and the discharge capacity is more than 2.5m3The above.
6. A method as claimed in claim 4, wherein in the pressure measuring step, after the injected fluid is stabilized, the well is shut down downhole, and the drawdown test of the reservoir is started, wherein the drawdown shut-in time is controlled to be 2.5-4 times the fluid injection time.
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| WO2003038287A1 (en) * | 2001-10-31 | 2003-05-08 | Zinoviy Dmitrievich Khomynets | Well jet device for testing and studying formations and the operating method thereof |
| CN103899264B (en) * | 2012-12-28 | 2016-08-10 | 中国石油化工股份有限公司 | The application process of Oil/gas Well screen casing top well cementation completion lifting prestressed ground anchor device |
| CN104912549B (en) * | 2015-05-05 | 2017-12-15 | 中煤科工集团西安研究院有限公司 | Coal bed gas region parameter method of testing |
| CN105672939B (en) * | 2016-03-21 | 2018-05-04 | 中国石油天然气股份有限公司 | Packer |
| CN106499384A (en) * | 2016-11-16 | 2017-03-15 | 中煤科工集团西安研究院有限公司 | Coal bed gas directional well injection/pressure fall-off test test device and its method |
| CN107654215B (en) * | 2017-09-19 | 2019-05-17 | 河南理工大学 | A method of coal bed gas well is transform as coal measures gas well |
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| CN108894742A (en) | 2018-11-27 |
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