CN203241324U - Shale gas permeability tester - Google Patents

Abstract

The utility model relates to a shale gas permeability tester, which comprises a gas cylinder, a pressure regulating valve, a pneumatic valve I, a pressure sensor I, a pneumatic valve II, a pressure sensor II and an emptying valve which are connected in turn through a sealing pipeline, and also comprises a manual valve, a model cup, a temperature sensor, a sample cup and a constant temperature device; the utility model discloses a shale sample granule that sealed sample cup holding is difficult for the fracture makes the test of shale permeability not receive the influence of crack permeability, provides equipment support for the matrix permeability of accurate survey shale.

Description

A kind of shale gas permeability detector

Technical field

The utility model relates to the experimental facilities field of the conventional physical parameter of oil-gas field development measuring, is specifically related to a kind of shale gas permeability detector.

Background technology

Be accompanied by commercial production to the demand of the energy, in order to obtain the new energy of taking over, become worldwide one large focus about the exploitation of unconventional rock gas.Think in the past the reservoir with impermeability, also can try every possible means its exploitation now.Past is for the permeability method of testing of common reservoir, if now when running into the extremely low reservoir of permeability according to the conventional method test, can become because flow is little is difficult to metering, the method can lose efficacy when running into low permeability reservoir.Prior one side, because the special mechanical properties of rock of shale, the shale rock core is producing the crack easily under underground surface conditions after release, by original conventional permeability method of testing or existing pressure pulse damped method, it all is the permeability of measuring sample by core holding unit clamping shale plunger sample, can't eliminate like this impact on permeability that bring in the crack in the plunger sample, measuring the penetration value that comes will be bigger than normal, thereby can't test out accurately shale matrix permeability, the seepage flow situation of logarithm value simulated formation produces very large interference and error.

The utility model content

In order to solve above technical matters, the utility model provides a kind of shale gas permeability detector, the accommodating shale sample particle not easy to crack of sample cup by sealing, make the test of shale permeability not be subjected to the impact of fracture permeability, for the matrix permeability that accurately records shale provides the equipment support.

The utility model is achieved through the following technical solutions:

A kind of shale gas permeability detector, comprise the gas cylinder, pressure-regulating valve, pneumatic valve I, pneumatic valve II and the atmospheric valve that connect by the sealing pipeline successively, also comprise by the sealing pipeline and be connected to pressure transducer I, hand valve and model cup between pneumatic valve I and the pneumatic valve II, the connection of hand valve control model cup, be provided with the pressure transducer II, temperature sensor and the sample cup that connect by the sealing pipeline between pneumatic valve II and atmospheric valve, pneumatic valve II, pressure transducer II, atmospheric valve, temperature sensor and sample cup place thermostat.

In technique scheme, accommodating shale sample particle in the described sample cup, even particle size.

In technique scheme, described shale sample particle is spheroid.

Analyzer of the present utility model is for the matrix permeability of Accurate Determining shale provides the equipment support, the problem that the crack that has solved plunger sample in the traditional measurement permeability method impacts the matrix permeability measurement of shale.

Description of drawings

The shale gas permeability detector synoptic diagram that Fig. 1 provides for the utility model embodiment;

The sample cup synoptic diagram that Fig. 2 provides for the utility model embodiment.

Measured curve and theoretical curve match comparison diagram that Fig. 3 provides for the utility model embodiment.

Embodiment

Below in conjunction with drawings and Examples the technical solution of the utility model is described in detail.

Referring to Fig. 1, a kind of shale gas permeability detector that the utility model embodiment provides, comprise the gas cylinder 1 that connects by the sealing pipeline successively, pressure-regulating valve 2, pneumatic valve I 3, pneumatic valve II 5 and atmospheric valve 7, also comprise by the sealing pipeline and be connected to pressure transducer I 4 between pneumatic valve I 3 and the pneumatic valve II 5, hand valve 8 and model cup 9, the connection of hand valve 8 control model cups 9, between pneumatic valve II 5 and atmospheric valve 7, be provided with the pressure transducer II 6 that connects by the sealing pipeline, temperature sensor 10 and sample cup 11, pneumatic valve II 5, pressure transducer II 6, atmospheric valve 7, temperature sensor 10 and sample cup 11 place thermostat 12.

Use the method for this shale gas permeability detector to comprise the steps:

Be under 10-30 ℃ the constant temperature sample cup 11 that the shale particle is housed to be applied greater than atmospheric pulse p in temperature ₀, record pressure, temperature and time by pressure transducer and temperature sensor, until pressure stabilizes to p gradually in the sample cup _eAnd remain unchanged;

According to the pressure of pressure transducer record, the time intercropping pressure-time relationship measured curve;

Described measured curve is made by the following method:

By the pseudopressure formula

Calculating pressure, wherein μ is the viscosity of gas, and unit is mPas, and Z is deviation factor for gas, and unit is that 1, p is the actual measurement gaseous tension of pressure transducer II 6, p ₀Initial pressure for pressure transducer II 6 records; The Z value gets 1 during calculating;

Pass through formula

The pressure zero dimension that obtains is turned to zero dimension pressure;

Pass through formula

The time t zero dimension of pressure transducer II 6 records is turned to non dimensional time, in the formula

P is the mean value of the pressure of pressure transducer II 6 records, in following formula,

Represent the constantly interior zero dimension force value of sample cup of t,

Represent the force value in 0 moment sample cup 11,

Refer to the force value in the sample cup 11 before not adding pulse, t _DBe non dimensional time, K is matrix permeability, and unit is mD, and φ is the factor of porosity of the shale particle of surveying, and unit is that 1, μ is the viscosity of gas in the sample cup 11, and unit is mPas, C _gBe gas volume compressibility coefficient in the sample cup 11, unit is MPa ^-1, L is the mean grain size of shale particle, and unit is cm, and footmark D represents nondimensional number;

The K value gets 2.01 * 10 in concrete example ^-05, 2.01 * 10 ^-06, 2.01 * 10 ^-07, 2.01 * 10 ^-08With 2.01 * 10 ^-09, the φ value is that 0.036, μ is 0.01824mPas.

According to zero dimension pressure

(t) and non dimensional time t _DDraw measured curve, measured curve is referring to Fig. 3.Draw the needed data of measured curve referring to table 1.

Table 1

Described theoretical curve is made by the following method:

By $\mathrm{\μ}\left(t_D\right)=-\frac{12}{R^3}\left[\underset{k=1}{\overset{\∞}{\mathrm{\Σ}}}\frac{{\mathrm{\α}}_k\sin {\mathrm{\α}}_k(\sin {\mathrm{\α}}_k-{\mathrm{\α}}_k\cos {\mathrm{\α}}_k)}{2{\mathrm{\α}}_k-\sin \left({2\mathrm{\α}}_k\right)}\right]{\∫}_0^{t_D}\mathrm{\μ}\left(\mathrm{\τ}\right)e^{-\frac{{{\mathrm{\α}}_k}^2}{R^2}(t_D-\mathrm{\τ})}\mathrm{d\τ}$ Calculate the zero dimension pressure μ (t of shale granule boundary _D), α in the formula _k=tan α _k, k=1,2,3 ... ∞ turns to above-mentioned equation is discrete ${\mathrm{\μ}}_j=-\frac{12}{R^3}\underset{k=1}{\overset{\∞}{\mathrm{\Σ}}}\frac{{\mathrm{\α}}_k\sin {\mathrm{\α}}_k(\sin {\mathrm{\α}}_k-{\mathrm{\α}}_k\cos {\mathrm{\α}}_k)}{2{\mathrm{\α}}_k-\sin \left(2{\mathrm{\α}}_k\right)}\frac{T}{N}\underset{i=1}{\overset{j}{\mathrm{\Σ}}}{\mathrm{\μ}}_i{e}^{-\frac{{{\mathrm{\α}}_k}^2}{R^2}(t_j-t_i)},$ In the formula, j=1,2,3 ... N, i=1,2 ... j realizes that the step of numerical integration is compiled referring to Li Qingyang, Wang Nengchao, the easy cardinal principles of righteousness, publishing house of the Central China University of Science and Technology, and numerical analysis (the 4th edition) 79-80 page or leaf, R is the zero dimension grain diameter in the formula, R gets 1, α during calculating _kTo satisfy α _k=tan α _kK different positive, k gets 20 from 1 in the present embodiment when calculating, at this moment

Leveled off to zero, T refers to from applying pulse to the time substitution formula of pressure complete equipilibrium

In the t value after the time value that obtains, the T value is that 100, N be according to the umber of computational accuracy needs with the T five equilibrium after calculating in the present embodiment, obtains the system of linear equations that is made of the first linear function group of N N, tries to achieve μ by existing algorithm _jValue;

Pass through formula

Ask the theoretical zero dimension pressure μ in the sample cup _d(t), will

Discretize obtains Realize that the step of numerical integration is referring to Li Qingyang, Wang Nengchao, easy cardinal principles of righteousness volume, publishing house of the Central China University of Science and Technology, numerical analysis (the 4th edition) 79-80 page or leaf, the described μ that substitution is tried to achieve by existing algorithm _jValue to the μ of discretize formula _iIn, i=0 in the formula, 1,2 ... j, j=1,2,3 ... N,

M is the gross mass of particle, and ρ is the density value of rock particles, and unit is g/cm ³, v ₂Refer to that sample cup 11 volumes add the volume of the pipeline that places thermostat 12; The β value is 0.01173 after calculating in the present embodiment.

According to theoretical zero dimension pressure μ dj and theoretical non dimensional time

Draw theoretical curve, in the formula, j=1,2,3 ... N, the theoretical curve of drafting is referring to Fig. 3.

Draw the needed data of theoretical curve and see Table 2.

Table 2

Measured curve and theoretical curve are done contrast, and the permeability of the good measured curve of match is exactly the permeability of this sample.

The curve of the Diamond spot on Fig. 3 is exactly theoretical curve, and the curve of the point of other shapes is exactly the measured curve that we obtain by the measured data zero dimension, we can see that foursquare point represents that curve and theoretical value are more consistent, Here it is so-called " match must be got well ", the permeability value that just can find out institute's test sample product is exactly the corresponding permeability value of curve that foursquare point represents, is 2.01 * 10- ⁰⁷MD.

The utility model is the equipment for the method design that can accurately record the shale matrix permeability, the accommodating shale sample particle not easy to crack of sample cup by sealing is measured, because the little difficult generation of shale sample particle diameter crack, so impact of having avoided the crack that matrix permeability is measured, constant temperature oven keeps the constant temperature of measuring instrument also to reduce the impact of temperature variation on the pressure accuracy, therefore the utility model can the Measurement accuracy matrix permeability, and permeability also provides the active data support to numerical simulation for oil-gas reservoir, waterfrac treatment accurately.

It should be noted last that, above embodiment is only unrestricted in order to implementer's case that this material is described, although with reference to preferred embodiment the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims (3)

1. shale gas permeability detector, it is characterized in that: comprise the gas cylinder (1) that connects by the sealing pipeline successively, pressure-regulating valve (2), pneumatic valve I (3), pneumatic valve II (5) and atmospheric valve (7), also comprise by the sealing pipeline and be connected to pressure transducer I (4) between pneumatic valve I (3) and the pneumatic valve II (5), hand valve (8) and model cup (9), the connection of hand valve (8) control model cup (9), between pneumatic valve II (5) and atmospheric valve (7), be provided with the pressure transducer II (6) that connects by the sealing pipeline, temperature sensor (10) and sample cup (11), pneumatic valve II (5), pressure transducer II (6), atmospheric valve (7), temperature sensor (10) and sample cup (11) place thermostat (12).

2. shale gas permeability detector as described in claim 1 is characterized in that: accommodating shale sample particle in the described sample cup (11), even particle size.

3. shale gas permeability detector as claimed in claim 2, it is characterized in that: described sample particle is spheroid.

Images