CN109632625A - A kind of deformation coal original position coal bed gas horizontal well unloads compression testing device and test method - Google Patents

A kind of deformation coal original position coal bed gas horizontal well unloads compression testing device and test method Download PDF

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Publication number
CN109632625A
CN109632625A CN201811266418.1A CN201811266418A CN109632625A CN 109632625 A CN109632625 A CN 109632625A CN 201811266418 A CN201811266418 A CN 201811266418A CN 109632625 A CN109632625 A CN 109632625A
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coal
hydraulic cylinder
bed gas
horizontal well
original position
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CN109632625B (en
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刘世奇
桑树勋
王冉
曹丽文
王海文
周效志
黄华州
高德燚
贾金龙
徐宏杰
刘会虎
李自成
刘长江
方辉煌
王鹤
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Priority to PCT/CN2019/080716 priority patent/WO2020087862A1/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00Investigating materials by mechanical methods
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/006Production of coal-bed methane
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/22Fuels, explosives
    • G01N33/222Solid fuels, e.g. coal

Abstract

The invention discloses a kind of deformation coal original position coal bed gas horizontal wells to unload compression testing device and test method, high-pressure pulsating fluid injection module includes hydraulic pump, hydraulic cylinder, high-modulus spring, surge chamber and constant speed and constant pressure pump, hydraulic pump surges with hydraulic cylinder to be connect, guide rod right end is fixedly connected with the right mounting plate of high-modulus spring, left end passes through the left mounting plate of high-modulus spring, and electromagnetic clutch is equipped between hydraulic cylinder piston rod and guide rod;The intracavitary impact piston left end of surge and the right mounting plate of high-modulus spring are affixed, and outlet that surge chamber is pumped with constant speed and constant pressure, its export pipeline are connected to Downhole jetting module;The right mounting plate of high-modulus spring is equipped with displacement sensor;Downhole jetting module is placed in analog material coal seam.The present invention can be realized the soft deformed coal horizontal well collapse hole of simulation and make cave and stress release (i.e. release is anti-reflection), actually adopt that release is anti-reflection to provide guidance foundation for deformation coal original position coal bed gas.

Description

A kind of deformation coal original position coal bed gas horizontal well unloads compression testing device and test method
Technical field
The present invention relates to a kind of coal bed gas horizontal wells to unload compression testing device and test method, more particularly to a kind of deformation coal Coal bed gas horizontal well in situ unloads compression testing device and test method, belongs to coal-bed gas exploitation field.
Background technique
Deformation coal refers to that coal seam is acted on by tectonic stress, and primary structure, construction are generated fragmentation, rub by destruction is split by force The coal of the tectonisms features such as wrinkle, polishing face.It is CHINESE COAL and coal that deformation coal extensive development and deformation coal coal bed gas resource, which enrich, The notable feature of layer gas resource, deformation coal stock number account for China and have found that the ratio of coal resources is very high, deformation coal coal bed gas money The ratio of the China Yuan Liangzhan coal bed gas resource total amount is bigger.Deformation coal has the prominent features such as rich gas, hypotonic, soft, mostly coal It is difficult because endangering big and methane drainage and utilization project with Coal Seam Prone To Outburst, mostly its wind is discharged in atmosphere in coal production, deformation coal coal seam The Efficient Development of gas has meaning very outstanding to the energy, safety, ecology.
Method based on Draining hook desorption gas production theory is the main method of current coal bed gas ground well development in situ, by The reforming modes poor effect such as extremely low and hydraulic fracturing in deformed coal permeability, Draining hook desorb gas production theory and are not suitable for Applied to deformed coal, exploration and development practice result is also indicated that, the coal bed gas based on Draining hook desorption gas production theoretical basis Exploration and development technology, including SVR technology series (vertical well fracture, U-shaped well, multiple hole horizontal well, fractured horizontal well etc.), ECBM skill Art series (CO2-ECBM、N2- ECBM etc.) and its complex technique, it cannot achieve the Efficient Development of deformation coal coal bed gas.Thus, Deformation coal coal bed gas Efficient Exploration development technique becomes with equipment restricts the important of In Coalbed Methane Industry of China rapid scale development One of technical bottleneck.
With the further investigation to Coal-seam Gas Recovery Technologies, it is anti-reflection that coal field protected seam deformation coal coal bed gas adopts release Development theories provide new thinking for the exploitation of deformation coal original position coal bed gas, therefore, grind and create one kind suitable for deformation coal original position The release of coal bed gas well is anti-reflection experimental rig and method, for realizing that deformation coal original position coal bed gas horizontal well collapse hole makes cave test Research has important theory directive significance, establishes to break China deformation coal original position coal bed gas surface well Technologies For High Efficient Development bottleneck Theorem opinion and actual production guidance basis.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of deformation coal original position coal bed gas horizontal well and unloads compression testing device and examination Proved recipe method can be realized the soft deformed coal horizontal well collapse hole of simulation and make cave and stress release, is deformation coal original position coal seam Foundation is instructed in the anti-reflection offer of release of actually adopting of gas.
In order to achieve the above object, the present invention adopts the following technical scheme: a kind of deformation coal original position coal bed gas horizontal well unloads Compression testing device, including high-pressure pulsating fluid injection module and Downhole jetting module, the high-pressure pulsating fluid injection module It is pumped including hydraulic pump, hydraulic cylinder, high-modulus spring, surge chamber and constant speed and constant pressure, the hydraulic pump surges with hydraulic cylinder Connection, guide rod right end is fixedly connected with the right mounting plate of high-modulus spring, left end across high-modulus spring left mounting plate and with It is slidably connected, and the piston rod and guide rod of hydraulic cylinder are coaxially disposed, and sets between hydraulic cylinder piston rod end face and guide rod left side There is electromagnetic clutch;Surge chamber and the right mounting plate with high-modulus spring are stretched out in the intracavitary impact piston left end of surge It is fixedly connected, the outlet of cavity and the constant speed and constant pressure pump of surge chamber, the export pipeline of surge chamber and underground are sprayed Penetrate module connection;The export pipeline of hydraulic pump is equipped with pressure sensor one, and the right mounting plate of high-modulus spring is equipped with displacement The water inlet pipeline of sensor, hydraulic pump is placed in liquid storage tank;The Downhole jetting module is placed in the similar material in sample bin Expect that horizontal well horizontal segment is close to the side of well head in coal seam, the liquid outlet of spray head is towards straight well side in sample bin.
Further, the experimental rig further includes abrasive can and mixing chamber, abrasive can outlet, the outlet of surge chamber It is connected to mixing chamber entrance, the outlet of mixing chamber is connected to Downhole jetting module;The exit of abrasive can is equipped with shut-off valve, is rushing It hits plenum outlet pipeline and is equipped with branch be connected to abrasive can tank mouth, branch and be equipped with pressure sensor two on the road.
Further, the experimental rig further includes intermediate receptacle, the entrance and constant speed and constant pressure pump discharge of intermediate receptacle Connection, the outlet of intermediate receptacle are connected to surge chamber.
Further, the spray head inner inlet section is cylindrical section, water exit end is nozzle, and the nozzle is from water inlet The taper that mouth to water outlet internal diameter is gradually reduced is equipped with element of putting english, element of putting english, nozzle and circle between cylindrical section and nozzle Shell of column coaxial arrangement.
Further, the described element of putting english is the cylindrical body that outer disc is screwed with helical orbit, outer circle and cylindrical section Internal diameter matches.
A kind of deformation coal original position coal bed gas horizontal well unloads pressure test method, includes the following steps:
1) it arranges the position of each equipment and connects equipment;
2) according to test need pulse frequency, setting electromagnetic clutch power off frequency, constant speed and constant pressure pump water injection frequency, The reciprocating frequency of hydraulic cylinder, three are consistent;According to the impact strength that test needs, the displacement of displacement sensor is set, And then control hydraulic cylinder reciprocating stroke and high-modulus amount of spring compression;
3) start hydraulic pump and constant speed and constant pressure pump, respectively to hydraulic cylinder and the intracavitary injection liquid of surge, while electromagnetism Clutch is powered on, and hydraulic cylinder drives guide rod to be moved to the left compression high-modulus spring;
4) when the degree of compression for the high-modulus spring that displacement sensor detects reaches experimental design reduction length, hydraulic cylinder Piston rod stop movement, after surge it is intracavitary it is hydraulically full after, constant speed and constant pressure pump stop injection liquid, electromagnetic clutch power-off It stops working, guide rod and hydraulic cylinder are detached from, and the restoring force of high-modulus spring moves to right impact piston quickly, percussion pressure chamber Interior liquid forms momentary pulse power, and the horizontal well in analog material coal seam is injected into after the acceleration of Downhole jetting module three-level It is interior;
5) after the completion of the release of high-modulus spring-return power, hydraulic cylinder piston rod is moved to right to guide rod and is contacted;
6) parameter being arranged according to step 2) repeats step 3) to step 5);
7) after the test, detaching pipelines open sample bin, analog material, Downhole jetting module after taking out test, clearly It washes inside sample bin.
Progress one, in above-mentioned step 2), the opening and closing frequency and the reciprocating motion of hydraulic cylinder of shut-off valve are set Frequency is consistent.
The present invention is by hydraulic cylinder, hydraulic pump, high-modulus spring, surge chamber and constant speed and constant pressure pump group at high-pressure pulsating Fluid injection module, solve use for laboratory pulsation pump discharge it is small, impact strength is low, control precision it is low, be unable to satisfy test need The problem of asking realizes and injects high-voltage high-speed fluid, cutting, broken coal body, simulation to horizontal well cave with certain pulse frequency The test of deformation coal coal bed gas horizontal well pressure fluctuation excitation and stress release (i.e. release is anti-reflection) is cave release development technique Theoretical basis has been established in research and development, parameter optimization, feasibility assessment, productivity prediction model foundation etc., and is ground for development technique equipment The indoor test of system provides platform.
Detailed description of the invention
Fig. 1 is experimental rig schematic diagram of the invention.
Fig. 2 is the structural schematic diagram of spray head.
In figure: 1, liquid storage tank, 2, hydraulic pump, 3, pressure sensor one, 5, hydraulic cylinder, 6, high-modulus spring, 7, guide rod, 8, Displacement sensor, 9, surge chamber, 10, impact piston, 11, electromagnetic clutch, 12.1, valve one, 12.2 valves two, 12.3, valve three, 12.4, valve four, 12.5, valve five, 12.6, valve six, 12.7, valve seven, 13, intermediate receptacle, 14, perseverance Fast constant pressure pump, 15, pressure sensor two, 16, abrasive can, 17, shut-off valve, 18, mixing chamber, 19, sample bin, 19.1, similar material Expect coal seam, 19.2, horizontal well, 19.3, straight well, 20, spray head, 20.1, cylindrical section, 20.2, element of putting english, 20.3, nozzle.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings (the right and left in left and right directions and Fig. 1 in being described below To identical).
As shown in Figure 1, a kind of deformation coal original position coal bed gas horizontal well unloads compression testing device, including the injection of high-pressure pulsating fluid Module and Downhole jetting module, the high-pressure pulsating fluid injection module include hydraulic pump 2, hydraulic cylinder 5, high-modulus spring 6, Surge chamber 9 and constant speed and constant pressure pump 14, the hydraulic pump 2, which is surged by solenoid valve with hydraulic cylinder 5, to be connect, 7 right end of guide rod Be fixedly connected with the right mounting plate of high-modulus spring 6, left end pass through high-modulus spring 6 left mounting plate and be slidably connected with it, The piston rod of hydraulic cylinder 5 and guide rod 7 are coaxially disposed, be equipped between 7 left side of 5 piston rod end face of hydraulic cylinder and guide rod electromagnetism from Clutch 11;Surge chamber 9 and the right mounting plate with high-modulus spring 6 are stretched out in 10 left end of impact piston in surge chamber 9 It is fixedly connected, positioned at the cavity on 10 right side of impact piston and outlet, the communicating pipe of constant speed and constant pressure pump 14 in surge chamber 9 Road is equipped with valve 1, and the export pipeline of surge chamber 9 is connected to Downhole jetting module, connecting pipeline is equipped with valve 4 12.4;The export pipeline of hydraulic pump 2 is equipped with pressure sensor 1, and the right mounting plate of high-modulus spring 6 is equipped with displacement and passes The water inlet pipeline of sensor 8, hydraulic pump 2 is placed in liquid storage tank 1;The Downhole jetting module is placed in similar in sample bin 19 19.2 horizontal segment of horizontal well is close to the side of well head in material coal seam 19.1, and the liquid outlet of spray head 20 is towards straight well in sample bin 19 19.3 sides.
The experimental rig further includes abrasive can 16 and mixing chamber 18, the outlet of abrasive can 16, the outlet of surge chamber 9 with The connection of 18 entrance of mixing chamber, the outlet of mixing chamber 18 is connected to Downhole jetting module;A certain proportion of abrasive material is added in a liquid, The ability that liquid cutting coal petrography can be increased, improves the anti-reflection efficiency of release;The exit of abrasive can 16 is equipped with shut-off valve 17, is used for It controls and inputs abrasive material into mixing chamber 18;Control fluid is equipped on pipeline between the outlet of mixing chamber 18 and Downhole jetting module Total valve, that is, valve 6 12.6;Branch, the branch being connected to 16 tank mouth of abrasive can are equipped on 9 export pipeline of surge chamber It is equipped with pressure sensor 2 15;Valve three is equipped on bypass line between surge chamber 9 and pressure sensor 2 15 12.3, valve 5 12.5 is equipped on the pipeline between pressure sensor 2 15 and abrasive can 16;It is set at the top of abrasive can 16 There is valve 7 12.7.
The experimental rig further includes intermediate receptacle 13, and 14 outlet of entrance and constant speed and constant pressure pump of intermediate receptacle 13 connects Logical, connecting pipeline is equipped with valve 2 12.2, and the outlet of intermediate receptacle 13 is connected to surge chamber 9.Enable to constant speed permanent The liquid flowing pressure and flow velocity of press pump 14 are more stable.
As shown in Fig. 2, the 20 inner inlet section of spray head is cylindrical section 20.1, water exit end is nozzle 20.3, it is described Nozzle 20.3 is the taper being gradually reduced from water inlet to water outlet internal diameter, is equipped with and adds between cylindrical section 20.1 and nozzle 20.3 Element 20.2 is revolved, element 20.2 of putting english, nozzle 20.3 and cylindrical section 20.1 are coaxially disposed;After fluid enters spray head 20, by adding There is three-dimensional velocity after revolving element 20.2, rotary flow pattern is become from streamlined flow mode, after the nozzle 20.3 by taper, It is high-speed jet that speed, which increases, so that the impact to coal seam is stronger, release effect is more preferable.
The element 20.2 of putting english is the cylindrical body that outer disc is screwed with helical orbit, and outer circle is interior with cylindrical section 20.1 Diameter matches, and is easily installed in spray head 20.
A kind of deformation coal original position coal bed gas horizontal well unloads pressure test method, includes the following steps:
1) it arranges the position of each equipment and connects equipment;
2) pulse frequency needed according to test, setting electromagnetic clutch 11 power off the water filling of frequency, constant speed and constant pressure pump 14 The reciprocating frequency of frequency, hydraulic cylinder 5, three are consistent;According to the impact strength that test needs, displacement sensor 8 is set Displacement, and then control 5 reciprocating stroke of hydraulic cylinder and 6 decrement of high-modulus spring;
3) valve 1, valve 2 12.2, valve 3 12.3, valve 4 12.4 and valve 6 12.6 are opened, liquid is started Press pump 2 and constant speed and constant pressure pump 14, inject liquid, while electromagnetic clutch 11 is powered into hydraulic cylinder 5 and surge chamber 9 respectively Work, hydraulic cylinder 5 drive guide rod 7 be moved to the left compression high-modulus spring 6 (during this, the left mounting plate phase of high-modulus spring 6 It is stationary for 5 outer cylinder of hydraulic cylinder);
4) degree of compression (the i.e. position of the right mounting plate of high-modulus spring 6 of the high-modulus spring 6 detected when displacement sensor 8 Move) when reaching experimental design reduction length, 5 piston rod of hydraulic cylinder stops movement, permanent after hydraulically full in surge chamber 9 Fast constant pressure pump 14 stops injection liquid, the power-off of electromagnetic clutch 11 stops working, and guide rod 7 and hydraulic cylinder 5 are detached from, high-modulus spring 6 restoring force moves to right impact piston 10 quickly, and the liquid in percussion pressure chamber 9 forms momentary pulse power, by well Lower jet module three-level is injected into the horizontal well in analog material coal seam 19.1 after accelerating;
5) after the completion of the release of 6 restoring force of high-modulus spring, 5 piston rod of hydraulic cylinder, which is moved to right to guide rod 7, to be contacted;
6) parameter being arranged according to step 2) repeats step 3) to step 5), and the liquid in surge chamber 9 i.e. can be with examination The pulse frequency, pressure, rate for testing design, cut analog material coal seam 19.1, are crushed, and analog material coal seam water is caused Horizontal well horizontal segment space fall damage forms release cave, convenient for the exploitation of subsequent coal bed gas;
7) after the test, detaching pipelines open sample bin 19, analog material, Downhole jetting module after taking out test, Inside cleaning sample storehouse 19.
In step 2), the opening and closing frequency that shut-off valve 17 is arranged is consistent with the reciprocating frequency of hydraulic cylinder 5.Such as This, can add abrasive material in high pressure, high-speed liquid, increase liquid to the cutting force in analog material coal seam.

Claims (7)

1. a kind of deformation coal original position coal bed gas horizontal well unloads compression testing device, which is characterized in that injected including high-pressure pulsating fluid Module and Downhole jetting module, the high-pressure pulsating fluid injection module include hydraulic pump (2), hydraulic cylinder (5), high-modulus bullet Spring (6), surge chamber (9) and constant speed and constant pressure pump (14), the hydraulic pump (2) surges with hydraulic cylinder (5) to be connect, guide rod (7) right end be fixedly connected with the right mounting plate of high-modulus spring (6), left end pass through high-modulus spring (6) left mounting plate and with It is slidably connected, and the piston rod of hydraulic cylinder (5) and guide rod (7) are coaxially disposed, in hydraulic cylinder (5) piston rod end face and guide rod (7) Electromagnetic clutch (11) are equipped between left side;Surge chamber is stretched out in impact piston (10) left end in surge chamber (9) (9) and with the right mounting plate of high-modulus spring (6) it is fixedly connected, cavity and the constant speed and constant pressure pump (14) of surge chamber (9) The export pipeline of outlet, surge chamber (9) is connected to Downhole jetting module;The export pipeline of hydraulic pump (2) is equipped with The right mounting plate of pressure sensor one (3), high-modulus spring (6) is equipped with displacement sensor (8), the water inlet of hydraulic pump (2) Pipeline is placed in liquid storage tank (1);The Downhole jetting module is placed in the analog material coal seam (19.1) in sample bin (19) Nei Horizontal well (19.2) horizontal segment is close to the side of well head, and the liquid outlet of spray head (20) is towards the interior straight well (19.3) one of sample bin (19) Side.
2. a kind of deformation coal original position coal bed gas horizontal well according to claim 1 unloads compression testing device, it is characterized in that: described Experimental rig further include abrasive can (16) and mixing chamber (18), abrasive can (16) outlet, surge chamber (9) outlet and mix The connection of chamber (18) entrance, the outlet of mixing chamber (18) is connected to Downhole jetting module;The exit of abrasive can (16) is equipped with cut-off Valve (17) is equipped with the branch being connected to abrasive can (16) tank mouth on surge chamber (9) export pipeline, branch road is equipped with pressure Sensor two (15).
3. a kind of deformation coal original position coal bed gas horizontal well according to claim 1 or 2 unloads compression testing device, it is characterized in that: The experimental rig further includes intermediate receptacle (13), entrance and constant speed and constant pressure pump (14) outlet of intermediate receptacle (13), The outlet of intermediate receptacle (13) is connected to surge chamber (9).
4. a kind of deformation coal original position coal bed gas horizontal well according to claim 3 unloads compression testing device, it is characterized in that: described Spray head (20) inner inlet section be cylindrical section (20.1), water exit end is nozzle (20.3), the nozzle (20.3) be from into The taper that the mouth of a river is gradually reduced to water outlet internal diameter is equipped with element of putting english between cylindrical section (20.1) and nozzle (20.3) (20.2), put english element (20.2), nozzle (20.3) and cylindrical section (20.1) are coaxially disposed.
5. a kind of deformation coal original position coal bed gas horizontal well according to claim 4 unloads compression testing device, it is characterized in that: described Element of putting english (20.2) be that outer disc is screwed with the cylindrical body of helical orbit, the internal diameter of outer circle and cylindrical section (20.1) matches It closes.
6. a kind of deformation coal original position coal bed gas horizontal well unloads pressure test method, which comprises the steps of:
1) it arranges the position of each equipment and connects equipment;
2) pulse frequency needed according to test, setting electromagnetic clutch (11) power off the water filling of frequency, constant speed and constant pressure pump (14) The reciprocating frequency of frequency, hydraulic cylinder (5), three are consistent;According to the impact strength that test needs, displacement sensor is set (8) displacement, and then control hydraulic cylinder (5) reciprocating stroke and high-modulus spring (6) decrement;
3) start hydraulic pump (2) and constant speed and constant pressure pump (14), inject liquid into hydraulic cylinder (5) and surge chamber (9) respectively, Electromagnetic clutch (11) is powered on simultaneously, and hydraulic cylinder (5) drives guide rod (7) to be moved to the left compression high-modulus spring (6);
4) hydraulic when the degree of compression for the high-modulus spring (6) that displacement sensor (8) detects reaches experimental design reduction length Cylinder (5) piston rod stops movement, and after hydraulically full in surge chamber (9), constant speed and constant pressure pumps (14) and stops injection liquid, electricity Magnet clutch (11) power-off stops working, and guide rod (7) and hydraulic cylinder (5) are detached from, and the restoring force of high-modulus spring (6) to impact Piston (10) quickly moves to right, and the liquid in percussion pressure chamber (9) forms momentary pulse power, by Downhole jetting module three-level It is injected into after acceleration in the horizontal well of analog material coal seam (19.1);
5) after the completion of the release of high-modulus spring (6) restoring force, hydraulic cylinder (5) piston rod, which is moved to right to guide rod (7), to be contacted;
6) parameter being arranged according to step 2) repeats step 3) to step 5);
7) after the test, detaching pipelines are opened sample bin (19), analog material, Downhole jetting module after taking out test, clearly It is internal to wash sample bin (19).
7. a kind of deformation coal original position coal bed gas horizontal well according to claim 6 unloads pressure test method, it is characterized in that: step 2) in, the opening and closing frequency that shut-off valve (17) are arranged is consistent with the reciprocating frequency of hydraulic cylinder (5).
CN201811266418.1A 2018-10-29 2018-10-29 Tectonic coal in-situ coal bed gas horizontal well pressure relief test device and test method Active CN109632625B (en)

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CN201811266418.1A CN109632625B (en) 2018-10-29 2018-10-29 Tectonic coal in-situ coal bed gas horizontal well pressure relief test device and test method
PCT/CN2019/080716 WO2020087862A1 (en) 2018-10-29 2019-04-01 Device for simulating pressure relief of in-situ coalbed methane horizontal well in tectonically-deformed coal, and simulation method

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CN201811266418.1A CN109632625B (en) 2018-10-29 2018-10-29 Tectonic coal in-situ coal bed gas horizontal well pressure relief test device and test method

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