CN104713802B - A kind of shale gas reservoir gassiness weight testing method - Google Patents

A kind of shale gas reservoir gassiness weight testing method Download PDF

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CN104713802B
CN104713802B CN201510152894.0A CN201510152894A CN104713802B CN 104713802 B CN104713802 B CN 104713802B CN 201510152894 A CN201510152894 A CN 201510152894A CN 104713802 B CN104713802 B CN 104713802B
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pressure
gas
rock core
gas reservoir
way valve
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CN104713802A (en
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杨文新
赵江艳
苟群芳
冯建芳
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中国石油化工股份有限公司江汉油田分公司勘探开发研究院
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Abstract

The invention discloses a kind of shale gas reservoir gassiness weight testing method and devices, shale gas reservoir air content test device, including the voltage-controlled system pump of high pressure nitrogen inlet duct, high-pressure natural gas inlet duct, the first six-way valve, booster pump, the second six-way valve, evacuator, insulating box, rock core desorption flow model, pressure sensor, ring and gas-metering device;High pressure nitrogen inlet duct and high-pressure natural gas inlet duct are connect after the first six-way valve and booster pump with the second six-way valve by pipeline, the evacuator is connect with the second six-way valve, second six-way valve is set after the desorption flow model of the rock core in insulating box by pipeline and is connect with gas-metering device, and the rock core desorption flow model is respectively and for pressure sensor and for tracking the voltage-controlled system pump connection of ring for adjusting rock core desorption flow model confining pressure.Apparatus of the present invention are realized to be desorbed by physical simulating method research gas reservoir development process shale gas, determines gas production during shale gas exploitation.

Description

A kind of shale gas reservoir gassiness weight testing method

Technical field

The present invention relates to shale gas development technique field more particularly to a kind of shale gas reservoir gassiness weight testing methods and dress It sets.

Background technique

Shale measurement of air content can be divided into two classes at present: (isothermal adsorption is real for direct method (desorption method) and indirect method Test method).Desorption method is measurement shale air content most straightforward approach, is measured using live drill cores and representative landwaste real Border air content, measurement shale air content include loss tolerance, gas desorption quantity and residual volume.Loss gas refers to that rock is mentioned from underground The gas desorbed from rock this period is sealed to ground to tinning, is unable to measure, and calculates that loss tolerance is accurate pre- Survey the key of shale air content;Stripping gas is that desorption is measured using buret naturally after sample tinning;Residual gas is by crushing rock The method of stone sample measures the method for gas desorption out.

Adsorption isotherm experiment method, which refers to, to be speculated adsorbed gas content by the methods of adsorption isotherm experiment, well log interpretation and dissociates Gas content.Adsorbed gas content establishes the relational model of adsorbed gas content and pressure, temperature by isothermal adsorption simulated experiment;It is real The process of testing is that rock sample product are pulverized into the particle of 0.1 ∽ 0.5mm of partial size, is then placed in thermostat and tests gas under different pressures The adsorbance of body draws out adsorption isotherm by pressure and adsorbance, calculates adsorbed gas content according to Lan Shi model.Free tolerance Effecive porosity and the gas saturation of free gas are determined to obtain by well log interpretation data, and free gas is effective in shale gas reservoir Porosity is matrix porosity and fracture porosity sum of the two, utilizes the well-log informations such as sound wave, neutron, density and nuclear magnetic resonance Matrix porosity can be measured, more accurate fracture porosity is gone out by dual laterolog material computation;Gas saturation is being built On the basis of vertical rock resistivity, shale-water resistivity, effecive porosity are with stratum mixing water resistivity relation formula, A Er is utilized Odd formula is calculated.

Desorption method measures shale air content, and measurement result is easy by coring mode, measuring method, loss air volume calculation side The influence of the factors such as method, measurement reservoir gas-bearing amount (stripping gas, residual gas) precision, gas desorption temperature calculates that loss tolerance is missed It is poor big.The shale adsorbance test carried out at present is referring to the experimental technique standard of coal bed gas adsorbance, using crushing shale Grain and have ignored the influence of pore structure, can not sufficiently characterize effect of the water saturation to adsorbed gas.

Summary of the invention

The technical problem to be solved in the present invention is that for the defects in the prior art, providing a kind of shale gas reservoir air content Test method and device.

The technical solution adopted by the present invention to solve the technical problems is: a kind of shale gas reservoir air content test device, packet Include high pressure nitrogen inlet duct, high-pressure natural gas inlet duct, the first six-way valve, booster pump, the second six-way valve, evacuator, Insulating box, rock core desorption flow model, pressure sensor, the voltage-controlled system pump of ring and gas-metering device;

The high pressure nitrogen inlet duct and high-pressure natural gas inlet duct pass through pipeline and pass through the first six-way valve and pressurization It is connect after pump with the second six-way valve, the evacuator is connect with the second six-way valve, and the second six-way valve is set by pipeline Connect after rock core desorption flow model in insulating box with gas-metering device, the rock core desorb flow model respectively with pressure Sensor and the voltage-controlled system pump connection of ring that flow model confining pressure is desorbed for tracking adjusting rock core.

Apparatus of the present invention working principle and process are as follows:

Natural core is obtained using from shale reservoir, is desorbed and is flowed according to geologic characteristics arrangement, filling rock core to rock core Movable model, by the voltage-controlled system pump of ring plus confining pressure (confining pressure is gas reservoir burden pressure), evacuator is to system pump down;Use high pressure gas Source, booster pump are pressurized to strata pressure to rock core pore filling high-pressure natural gas, under certain temperature (25 DEG C or formation temperature) 24 hours pressure is kept to stablize.The valve for opening rock core desorption flow model, releases a certain amount of gas, and system pressure is made to reduce by 2 ∽ 6MPa, is then shut off valve, measures gas production with gas-metering device;Meanwhile system pressure variation is monitored, at least stablize 3 ∽ 8 hours, the corresponding pressure drop of record output gas, then carry out decompression test next time, until test terminates without gas production.Pass through Gas-metering device, pressure monitoring device monitor automatically, acquire, handle data.It is split according to the isothermal adsorption rule of gas Divide adsorbed gas and free gas, calculates adsorption isothermal curve.

According to above-mentioned apparatus, the present invention also provides a kind of shale gas reservoir gassiness weight testing method, this method includes following step It is rapid:

1) it acquires shale gas reservoir individual well same position rock core and drills through gas reservoir column natural core, testing rock core physical property ginseng Number collects gas reservoir static nature parameter;The testing rock core physical parameter includes porosity, water saturation, the content of organic matter And core quality;The gas reservoir static nature parameter includes gas reservoir formation temperature, strata pressure and burden pressure;

2) rock core is put into above-mentioned shale gas reservoir air content test device, evacuates saturated natural gas at room temperature, then It is warming up to formation temperature, system pressure is pressurized to strata pressure, and confining pressure is gas reservoir burden pressure;Temperature, pressure are stablized 24 hours After start to test, test decompression exploitation when different pressures under output tolerance;

3) point free gas and adsorbed gas are split according to the isothermal adsorption rule of gas, calculates adsorption isothermal curve;

According to the above scheme, specific as follows in the step 2:

2.1) rock core is put into shale gas reservoir air content test device, the rock core is that dry rock core or known rock core contain The aqueous rock core of water saturation;

2.2) at room temperature, shale gas reservoir air content test device evacuates saturated natural gas: evacuator is to rock core solution It inhales flow model to evacuate, until vacuum pressure -0.1MPa, closes evacuator, opens high-pressure air source, booster pump filling natural gas extremely Strata pressure, it is ensured that model and pipeline are filled by net gas;Rock gas reservoir air content test device system pressure is maintained at stratum Stablize under pressure 24 hours, allows natural gas to spread in shale, adsorbs and sufficiently achieve balance;

2.3) confining pressure is adjusted to gas reservoir burden pressure using the voltage-controlled system pump tracking of ring;

2.4) when decompression is exploited every time, opening valve from high pressure reduces by 2 ∽ 6MPa, is then shut off valve, monitors system pressure Power variation, keeps pressure at least to stablize 3 ∽ 8 hours, measures output tolerance at this time, the corresponding pressure of record output gas;Carry out again Decompression test next time, until test terminates without gas production.

According to the above scheme, gas reservoir natural core is drilled through from practical shale Gas Reservoir in the step 1), gas reservoir day Right core diameter is 2.5cm, 5 ∽ 8cm of monolithic length, 25 ∽ 30cm of cumulative length.

According to the above scheme, in the step 3), when calculating gas decompressional expansion, it need to consider the shadow of the compressibility factor of gas It rings;Hole free gas is the dead volume split the free gas separated and subtract test macro.

The beneficial effect comprise that: apparatus of the present invention simulate gas reservoir environment and gas reservoir development scheme, reproduce Gas production, pressure and other parameters changing rule in gas reservoir production process realize and study gas reservoir development mistake by physical simulating method Journey shale gas desorbs, and determines gas production during shale gas exploitation, to determine the free tolerance of different existence state gas and inhaling Attached tolerance, provides data supporting.Apparatus of the present invention high degree of automation, data are monitored automatically, are acquired, handling, is accurate.

Detailed description of the invention

Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:

Fig. 1 is the structural schematic diagram of the embodiment of the present invention;

Fig. 2 is shale different pressures and air content relation curve;

Fig. 3 is sandstone different pressures and air content relation curve (no gas absorption);

Fig. 4 is shale adsorption isothermal curve.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention It is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit The fixed present invention.

As shown in Figure 1, shale gas reservoir air content test device, including high pressure nitrogen inlet duct 1, high-pressure natural gas air inlet Device 2, the first six-way valve 3, booster pump 4, evacuator 5, the second six-way valve 6, insulating box 7, rock core desorption flow model 8, pressure The voltage-controlled system pump 10 of force snesor 9, ring and gas-metering device 11;

High pressure nitrogen inlet duct 1 and high-pressure natural gas inlet duct 2 pass through pipeline and pass through the first six-way valve 3 and booster pump It is connect after 4 with the second six-way valve 6, evacuator 5 is connect with the second six-way valve 6, and the second six-way valve 6 is set by pipeline in perseverance In incubator 7 rock core desorption flow model 8 after connect with gas-metering device 11, rock core desorption flow model 8 respectively with pressure Sensor 9 and voltage-controlled 10 connection of system pump of ring that flow model confining pressure is desorbed for tracking adjusting rock core.

High pressure nitrogen, the natural gas provided by high-pressure air source, 12 MPa of maximum pressure;

Booster pump, maximum output pressure is up to 50 MPa;

Rock core desorbs flow model, can be packed into diameter 2.5cm rock core, maximum rock core pattern length 30cm, pressure 50MPa;

The voltage-controlled system pump tracking of ring adjusts confining pressure, 70 MPa of maximum pressure;

Evacuator is evacuated to rock core desorption flow model, until vacuum pressure -0.1MPa, -0.1 ∽ of pressure limit 0MPa;

0 ∽ of pressure monitoring pressure limit, 50 MPa;

Calorstat temperature range: 100 DEG C of room temperature ∽,;

Gas controlling device is for volume when testing 25 DEG C of output gas, 0 ∽ 1000ml of range of flow.

Apparatus of the present invention working principle and process are as follows:

Natural core is obtained using from shale reservoir, is desorbed and is flowed according to geologic characteristics arrangement, filling rock core to rock core Movable model, by the voltage-controlled system pump of ring plus confining pressure (confining pressure is gas reservoir burden pressure), for evacuator to system pump down, saturation is natural Gas is pressurized to strata pressure with high-pressure air source, booster pump to rock core pore filling high-pressure natural gas, certain temperature (25 DEG C or Formation temperature) under keep 24 hours pressure to stablize.Valve is opened out, a certain amount of gas is released, reduces system pressure by 2 ∽ 6MPa is then shut off valve, measures gas production with gas-metering device;Meanwhile system pressure variation is monitored, at least stablize 3 ∽ 8 Hour, the corresponding pressure drop of record output gas, then carry out decompression test next time, until test terminates without gas production.Pass through gas Metering device, pressure monitoring device monitor automatically, acquire, handle data.It is carried out splitting a point suction according to the isothermal adsorption rule of gas Attached gas and free gas calculate adsorption isothermal curve.

Shale gas reservoir air content and absorption tolerance test method of the present invention, carry out according to following steps:

1) it acquires shale gas reservoir individual well same position rock core and drills through gas reservoir column natural core, testing rock core physical property ginseng Number collects gas reservoir static nature parameter;The testing rock core physical parameter includes porosity, water saturation, the content of organic matter And core quality;The gas reservoir static nature parameter includes gas reservoir formation temperature, strata pressure and burden pressure;

Shale physical parameter is as follows in gas reservoir in the present embodiment: there is grain diameter to be less than 0.03mm, clay mineral and length It is nanoscale size, permeability less than 0.1md that English matter mineral content, which is greater than 50%, hole,.

Natural core is drilled through from practical Gas Reservoir, diameter 2.5cm, 5 ∽ 8cm of monolithic length, cumulative length 25 ∽30cm。

100 DEG C of 50 ∽ of gas reservoir formation temperature, 20 ∽ 50MPa of strata pressure, 40 ∽ 70MPa of burden pressure.

2) according to simulator is installed shown in Fig. 1, saturated natural gas is evacuated at room temperature, is then warming up to formation temperature, System pressure is pressurized to strata pressure, and confining pressure is gas reservoir burden pressure;Temperature, pressure start to test after stablizing 24 hours, test Output tolerance under different pressures when decompression exploitation;

Geologic characteristics described in step 2 are shale gas reservoir heterogeneities.

The evacuation saturated natural gas of simulator described in step 2, which is evacuator, to be evacuated to rock core desorption flow model, To vacuum pressure -0.1MPa, evacuator is closed, opens high-pressure air source, booster pump fills natural gas to strata pressure, it is ensured that mould Type and pipeline guarantee are filled by net gas.

Test device system pressure described in step 2, which should be maintained under strata pressure, to be stablized 24 hours, allows natural gas in shale Middle diffusion, absorption sufficiently achieve balance.It is 86 DEG C of formation temperature, 32 ∽ 38 of gas reservoir reset pressure, average such as China shale gas field Well depth 2400m, rock density 2.56g/cm3, calculating overburden pressure is 61.4MPa, it is preferred, therefore, that rock core confining pressure 61MPa, Rock core pore pressure 32MPa.

Rock core is put into step 2 described device can be dry rock core, and being also possible to aqueous rock core (will be clear that rock core contains Water saturation), entire test macro will guarantee non-leakage (the lower pressure drop in 10 hours of 32MPa is less than 0.1MPa).

When being depressured exploitation described in step 2, opening valve from high pressure reduces by 2 ∽ 6MPa, is then shut off valve, measurement is at this time Output tolerance, meanwhile, monitoring system pressure variation, pressure at least stablizes 3 ∽ 8 hours, the corresponding pressure of record output gas;It opens again Exhibition decompression test next time.

When being depressured exploitation described in step 2 more than system pressure 15MPa, to test natural gas under at least four pressure and produce Output;When below system pressure 15MPa, natural gas quantum of output under 6 pressure is at least tested;Test curve is as shown in Figure 2.

3) point free gas and adsorbed gas are split, adsorption isothermal curve under formation condition is finally calculated;A point process is split in step 3) It is the isothermal adsorption rule according to gas, reaches adsorption equilibrium higher than gas after 15MPa, adsorbance reaches maximum value, high pressure The gas of lower output is all free gas in rock core interstitial space, and output is free gas and adsorbed gas under low pressure;There is no adsorbed gas When hole gas production and pressure it is linear (as shown in Figure 3).

It is split described in step 3) and separates under different pressures after free gas (straight line indicates free gas variation in Fig. 2), residual gas Then it is the absorption of output, calculates the isothermal adsorption amount (as shown in Figure 4) under different pressures;

When calculating gas decompressional expansion described in step 3), the influence of the compressibility factor of gas is considered;Hole free gas is to split The free gas separated subtracts the dead volume of test macro.

It should be understood that for those of ordinary skills, it can be modified or changed according to the above description, And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.

Claims (7)

1. a kind of shale gas reservoir gassiness weight testing method, as follows using shale gas reservoir air content test device: including high pressure nitrogen Inlet duct, high-pressure natural gas inlet duct, the first six-way valve, booster pump, the second six-way valve, evacuator, insulating box, rock core Desorb the voltage-controlled system pump of flow model, pressure sensor, ring and gas-metering device;
The high pressure nitrogen inlet duct and high-pressure natural gas inlet duct pass through pipeline after the first six-way valve and booster pump It is connect with the second six-way valve, the evacuator is connect with the second six-way valve, and the second six-way valve is set by pipeline in constant temperature Connect after rock core desorption flow model in case with gas-metering device, the rock core desorb flow model respectively with pressure sensing Device and the voltage-controlled system pump connection of ring that flow model confining pressure is desorbed for tracking adjusting rock core;
Characterized by comprising the following steps:
1) it acquires shale gas reservoir individual well same position rock core and drills through gas reservoir column natural core, testing rock core physical parameter is received Collect gas reservoir static nature parameter;The testing rock core physical parameter includes porosity, water saturation, the content of organic matter and rock core Quality;The gas reservoir static nature parameter includes gas reservoir formation temperature, strata pressure and burden pressure;
2) rock core is put into the shale gas reservoir air content test device, evacuates saturated natural gas at room temperature, then heats up To formation temperature, system pressure is pressurized to strata pressure, and confining pressure is gas reservoir burden pressure;Temperature, pressure are opened after stablizing 24 hours Begin to test, output tolerance under different pressures when test decompression is exploited;
3) point free gas and adsorbed gas are split according to the isothermal adsorption rule of gas, calculates adsorption isothermal curve under formation condition.
2. the method according to claim 1, wherein gas reservoir column natural core is from reality in the step 1) Shale gas reservoir reservoir drills through, and the gas reservoir column natural core diameter is 2.5cm, monolithic length 5 to 8cm, cumulative length 25 To 30cm.
3. the method according to claim 1, wherein specific as follows in the step 2:
2.1) rock core is put into the shale gas reservoir air content test device, the rock core is that dry rock core or known rock core contain The aqueous rock core of water saturation;
2.2) at room temperature, the shale gas reservoir air content test device evacuates saturated natural gas: evacuator is to rock core solution It inhales flow model to evacuate, until vacuum pressure -0.1MPa, closes evacuator, opens high-pressure air source, booster pump filling natural gas extremely Strata pressure, it is ensured that model and pipeline are filled by net gas;Shale gas reservoir air content test device system pressure is maintained at ground Stablize under stressor layer 24 hours, allows natural gas to spread in shale, adsorbs and sufficiently achieve balance;
2.3) confining pressure is adjusted to gas reservoir burden pressure using the voltage-controlled system pump tracking of ring;
2.4) when decompression is exploited every time, opening valve from high pressure reduces by 2 to 6MPa, is then shut off valve, and monitoring system pressure becomes Change, pressure is kept at least to stablize 3 to 8 hours, measures output tolerance at this time, the corresponding pressure of record output gas;Carry out again next Secondary decompression test, until test terminates without gas production.
CN201510152894.0A 2015-04-01 2015-04-01 A kind of shale gas reservoir gassiness weight testing method CN104713802B (en)

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