CN102135484B - Device and method for testing gas-water ratio of underground sample with water gas reservoir and water soluble gas reservoir - Google Patents

Abstract

The invention relates to a device and a method for testing a gas-water ratio of an underground sample with a water gas reservoir and a water soluble gas reservoir. The device mainly comprises a pump (1), an intermediate container (2), an underground sampler (3), a gas and water separator (5), a gas meter (6), a water meter (8) and a heating sleeve (9), and is characterized in that: both ends of the underground sampler (3) are connected with the intermediate container (2) and the pump (1) respectively; the heating sleeve (9) is arranged outside the underground sampler; the gas and water separator (5) is arranged at the top end of the underground sampler; the gas and water separator is connected with the gas meter (6) and the water meter (8); the gas meter (6) is connected with a gas phase chromatograph (7); and the water meter (8) is connected with a pre ure volume temperature (PVT) instrument (10). The theory of the device is reliable, the device has rational structure and is easy to operate; by the test method, a sample is transferred by a pressure transmitting medium represented by local formation water, so that the gas-water ratio of the underground sample with the water gas reservoir and the water soluble gas reservoir can be tested accurately, and damages of mercury are avoided; therefore, the method contributes to environmental protection.

Description

The band aqueous vapor is hidden, the determinator and the method for water soluble gas reservoir downhole samples gas-water ratio

Technical field

The present invention relates to the petroleum natural gas exploration field and in band aqueous vapor Tibetan, water soluble gas reservoir performance history, measure the device and method of dissolving tolerance in the water, particularly relate to the device and method that utilizes downhole samples to measure original gas-water ratio.

Background technology

For water soluble gas reservoir, how much air content is the key parameter of confirming the gas reservoir reserves in the local water, directly relates to gas reservoir and whether has exploitation value.It confirms that the most accurately method then is through obtaining downhole fluid sample, testing indoor.For general hydrocarbon-bearing pool downhole samples, traditional practice is to make pressure transmitting medium with mercury under the temperature, pressure when keeping sampling to change the oil gas sample over to the PVT appearance and can test, in recent years because fluid test main measuring oil gas phase; Do not consider water; Mercury is poisonous in addition, therefore often adopts saturated brine to change appearance as pressure transmitting medium, but when wanting in the test water gas content; Because will dissolve tolerance in the water, this method is obviously inapplicable.Therefore how the original gas-water ratio of measuring downhole samples under without the prerequisite of mercury is exactly a relatively stubborn problem.

Summary of the invention

The object of the present invention is to provide the determinator of band aqueous vapor Tibetan, water soluble gas reservoir downhole samples gas-water ratio, this principle of device is reliable, and is rational in infrastructure, easy and simple to handle.

Another object of the present invention is to provide the method for utilizing this device to measure band aqueous vapor Tibetan, water soluble gas reservoir downhole samples gas-water ratio; This method is changeed appearance with this well local water as pressure transmitting medium; Avoid using the harmfulness of mercury, can accurately measure the original gas-water ratio of band aqueous vapor Tibetan, water soluble gas reservoir downhole samples.

For reaching above technical purpose, the present invention provides following technical scheme.

The band aqueous vapor is hidden, the determinator of water soluble gas reservoir downhole samples gas-water ratio; Mainly be made up of pump, intermediate receptacle, subsurface sampler, moisture trap, gasometer, watermeter, heating jacket, it is characterized in that, said subsurface sampler two ends link to each other with intermediate receptacle, pump respectively successively; There is heating jacket the subsurface sampler outside; The subsurface sampler top is connected with moisture trap, and said moisture trap is connected with gasometer, watermeter respectively, and said gasometer is connected with gas chromatograph; Said watermeter is connected with the PVT appearance, between said pump, intermediate receptacle, subsurface sampler, moisture trap, gasometer, gas chromatograph, watermeter, the PVT appearance valve is arranged all.

The band aqueous vapor is hidden, the assay method of water soluble gas reservoir downhole samples gas-water ratio, may further comprise the steps successively:

(1) uses densitometer and measure the density p of local water under room temperature and atmospheric pressure _w

(2) subsurface sampler is put heating jacket, be heated to formation temperature T, simultaneously the two ends connected system is found time;

(3) with pump local water is injected the ST two ends, pressurization is gradually opened pressure p up to opening the subsurface sampler two ends, writing down;

(4) keep pump pressure for opening pressure, constant voltage pumps into local water from the ST bottom, the initial volume reading V of meter pump _Beginning, exit gradually from the ST top, when no longer giving vent to anger; The termination of pumping venting is up to atmospheric pressure; Under low pressure pump into local water again from the ST bottom, whole water outlets up to the top, and till not having gas to come out again; Gasometer and watermeter that the gas that comes out from the subsurface sampler top, water get into moisture trap and links to each other with moisture trap, gasometer and watermeter demonstrate tolerance V respectively _G1With water yield V _W1

(5) pressure is returned to open the volume reading V that pressure writes down pump once more _Eventually

The gas, water of (6) emitting ST and pipeline get into moisture trap, and gasometer and watermeter show tolerance V respectively _G2With water yield V _W2

(7) with ST together with joint and the pipeline W that weighs ₁, butt junction and ST are dried, once more with ST together with joint and the pipeline W that weighs ₂, the water yield W that obtains evaporating ₁-W ₂

(8) local water in the watermeter is changed in the PVT appearance, at room temperature formation testing water is at atmospheric pressure and open the volume V under the pressure p ₀And V _p, try to achieve local water at the volume factor Bw that opens under the pressure:

(9) utilize following formula to try to achieve the actual amount of water W in the ST:

(10) institute that will from ST, deviate from is with tolerance divided by actual amount of water W, thereby tries to achieve original gas-water ratio GWR:

$\mathrm{GWR}=\frac{V_{g_1}+V_{g2}}{W}$

In apparatus of the present invention, gasometer is connected with gas chromatograph, and the gas that from local water, comes out gets in the gas chromatograph can carry out various constituent analyses.

Compared with prior art, the present invention has following beneficial effect:

(1) determinator of the present invention, principle is reliable, and is rational in infrastructure, easy and simple to handle, utilizes this device can accurately measure the original gas-water ratio of band aqueous vapor Tibetan, water soluble gas reservoir downhole samples;

(2) the present invention changes appearance with this well local water as pressure transmitting medium, has avoided using the harmfulness of mercury, and is safe and reliable, helps environmental protection.

Description of drawings

Fig. 1 is that band aqueous vapor of the present invention is hidden, the structural representation of the determinator of water soluble gas reservoir downhole samples gas-water ratio.

Embodiment

Further specify the present invention according to accompanying drawing below.

Referring to Fig. 1.

The band aqueous vapor is hidden, the determinator of water soluble gas reservoir downhole samples gas-water ratio; Mainly form by pump 1, intermediate receptacle 2, subsurface sampler 3, moisture trap 5, gasometer 6, watermeter 8, heating jacket 9; It is characterized in that; Said subsurface sampler 3 two ends link to each other with intermediate receptacle 2, pump 1 respectively successively, and there is heating jacket 9 the subsurface sampler outside, and the subsurface sampler top is connected with moisture trap 5; Said moisture trap is connected with gasometer 6, watermeter 8 respectively; Said gasometer 6 is connected with gas chromatograph 7, and said watermeter 8 is connected with PVT appearance 10, between said pump, intermediate receptacle, subsurface sampler, moisture trap, gasometer, gas chromatograph, watermeter, the PVT appearance valve 4 is arranged all.

The band aqueous vapor is hidden, the assay method of water soluble gas reservoir downhole samples gas-water ratio, may further comprise the steps successively:

(1) uses the density p of this well of densitometer test local water under 20 ℃ and 0.1MPa _w=1.1096g/cm ³

(2) ST is connected import and export pipeline, valve,, subsurface sampler is put heating jacket, be heated to formation temperature T=70 ℃, found time in two ends simultaneously with low pressure gas (5MPa) leak test; Reach requirement (finding time 3 hours) up to temperature stabilization and degree of exhaustion;

(3) with this well local water as pressure transmitting medium, with pump this well local water is injected the ST two ends, pressurization is gradually opened pressure p=14MPa up to opening the subsurface sampler two ends, writing down;

(4) emit at the ST top and connect moisture trap on the pipeline, keep pump pressure for opening pressure 14MPa, constant voltage pumps into local water bottom the ST, and the initial volume reading V of volume pump _Beginning=31.33ml exits from the ST top gradually, and being that unit with 50ml arranges several times; With the influence of deaeration, up to atmospheric pressure, when no longer giving vent to anger to forming; Squeeze into a certain amount of local water again from the ST bottom, whole water outlets up to the top, and till not having gas to come out again; Gasometer and watermeter that the gas that comes out from the subsurface sampler top, water get into moisture trap and links to each other with moisture trap, gasometer and watermeter demonstrate tolerance V respectively _G1=1759ml and water yield V _W1=41ml;

(5) pressure is returned to open the volume reading V that pressure writes down pump once more _Eventually=167.54ml;

The gas, water of (6) emitting ST and pipeline get into moisture trap, and gasometer and watermeter show tolerance V respectively _G2=0ml, water yield V _W2=526ml;

(7) with ST together with joint and the pipeline W that weighs ₁=5.830kg, with nitrogen blowpipe line, and with the oven dry of joint and ST, after the cooling once more with ST together with joint and the pipeline W that weighs ₂=5.812kg, the water yield W that obtains evaporating ₁-W ₂=0.018kg;

(8) local water in the watermeter is changed in the PVT appearance, at room temperature formation testing water is at atmospheric pressure and open the volume V under pressure p=14MPa ₀=150ml and V _p=148.78ml, try to achieve local water at the volume factor Bw that opens under the pressure:

(9) utilize following formula to try to achieve the actual amount of water W in the ST:

(10) institute that will from ST, deviate from is with tolerance divided by actual amount of water W, thereby tries to achieve original gas-water ratio GWR:

$\mathrm{GWR}=\frac{V_{g_1}+V_{g_2}}{W}=\frac{1759}{445.90}=3.9448\mathrm{ml}.\mathrm{ml}$

Claims (2)

1. be with the determinator of aqueous vapor Tibetan, water soluble gas reservoir downhole samples gas-water ratio; Mainly form by pump (1), intermediate receptacle (2), subsurface sampler (3), moisture trap (5), gasometer (6), watermeter (8), heating jacket (9); It is characterized in that; Said subsurface sampler (3) two ends link to each other with intermediate receptacle (2), pump (1) respectively successively, and there is heating jacket (9) the subsurface sampler outside, and the subsurface sampler top is connected with moisture trap (5); Said moisture trap is connected with gasometer (6), watermeter (8) respectively; Said gasometer (6) is connected with gas chromatograph (7), and said watermeter (8) is connected with PVT appearance (10), and valve (4) is all arranged between said pump, intermediate receptacle, subsurface sampler, moisture trap, gasometer, gas chromatograph, watermeter, the PVT appearance.

2. utilize the method for sample gas-water ratio under the described device gage well of claim 1, may further comprise the steps successively:

(1) uses densitometer and measure the density p of local water under room temperature and atmospheric pressure _w

(2) subsurface sampler is heated to formation temperature, simultaneously the two ends connected system is found time;

(3) with pump local water is injected the ST two ends, pressurization is gradually opened pressure P up to opening the subsurface sampler two ends, writing down;

(4) keep pump pressure for opening pressure, constant voltage pumps into local water from the ST bottom, the initial volume reading V of meter pump _Beginning, exit gradually from the ST top, when no longer giving vent to anger; The termination of pumping venting is up to atmospheric pressure; Under low pressure pump into local water again from the ST bottom, whole water outlets up to the top, and till not having gas to come out again; The gas that comes out from the subsurface sampler top, water get into moisture trap, and gasometer and watermeter demonstrate tolerance V respectively _G1With water yield V _W1

(5) pressure is returned to open the volume reading V that pressure writes down pump once more _Eventually

The gas, water of (6) emitting ST and pipeline get into moisture trap, and gasometer and watermeter show tolerance V respectively _G2With water yield V _W2

(7) with ST together with joint and the pipeline W that weighs ₁, with the oven dry of joint and ST, once more with ST together with joint and the pipeline W that weighs ₂, the water yield W that obtains evaporating ₁-W ₂

(8) local water in the watermeter is changed in the PVT appearance, at room temperature measure local water at atmospheric pressure and open the volume V under the pressure P ₀And V _p, try to achieve local water at the volume factor of opening under the pressure

(9) utilize following formula to try to achieve the actual amount of water W in the ST:

(10) institute that will from ST, deviate from is with tolerance divided by actual amount of water W, thereby tries to achieve original gas-water ratio GWR:

$\mathrm{GWR}=\frac{V_{g_1}+V_{g2}}{W}.$

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