CN111927447B - Bubble point pressure testing method and device for underground high-pressure water sample - Google Patents
Bubble point pressure testing method and device for underground high-pressure water sample Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 39
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- 238000000034 method Methods 0.000 claims abstract description 28
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
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- 229930195733 hydrocarbon Natural products 0.000 description 4
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Abstract
The invention discloses a bubble point pressure testing method and a testing device thereof for an underground high-pressure water sample, which predict bubble point pressure Pb according to interpolation of proportional relation between bubble point pressure and gas-water ratio0Obtained according to a chart of the relation between the bubble point pressure and the GWR, and taking the value as a reference value, namely the value at the pressure (Pb) respectively0+2MPa)、Pb0、(Pb0-2MPa), respectively obtaining gas-water ratios GWR1, GWR2 and GWR3 of the prepared water sample through the steps (a) to (e), thereby obtaining a relation curve between the bubble point and the GWR, and then bringing the obtained initial gas-water ratio GWR into the relation curve between the bubble point and the GWR to obtain the underground bubble point pressure Pb. The method has the advantages of simple operation and calculation and rigorous and reliable process, solves the problems that in the prior art, the bubble point pressure is obtained through a relation chart, the judgment result belongs to an estimated value, and the development of unconventional gas reservoirs such as water-soluble gas is seriously influenced, realizes the accurate measurement of the bubble point pressure of the formation water, and provides accurate and reliable geological basis for the development of the water-soluble gas.
Description
Technical Field
The invention relates to the field of oil and gas field development, in particular to a bubble point pressure testing method and a bubble point pressure testing device for an underground high-pressure water sample.
Background
In the field of oil and gas geology, the bubble point pressure is the pressure at which the system is gradually reduced under isothermal conditions, the pressure at which the first bubble occurs when the liquid mixture begins to vaporize, i.e., the pressure at which a hydrocarbon system is at the bubble point. The bubble point pressure is often referred to by field personnel as the saturation pressure. In oil reservoir development, the oil layer pressure should be kept higher than the bubble point pressure as much as possible to avoid the separation of natural gas. Because the natural gas is separated out in the oil layer, the energy consumption, the resistance increase, the viscosity of underground crude oil increase and the oil recovery rate reduction are caused. Therefore, accurate measurement of bubble point pressure is an important task in geological preparation of oil fields before formal development, and directly affects the recovery of crude oil most relevant to the production efficiency. For natural gas wells, light hydrocarbon gas is dissolved in formation water to form water-soluble gas, and the bubble point pressure of the water-soluble gas is an important factor influencing water-soluble gas production. Under the long-term development in the field of petroleum and natural gas, a chart of the relationship between bubble point pressure and gas-water ratio GWR is formed through empirical accumulation in the prior art, so that the existing judgment on the bubble point pressure is generally inquired directly through the chart. However, in the cognitive range of those skilled in the art, the existing relation chart always belongs to data accumulation of experience superposition, only can represent a relative estimation value between bubble point pressure and steam-water ratio, and cannot accurately judge the bubble point pressure of formation water in a high-pressure environment in a well, so that the development of unconventional gas reservoirs such as water-soluble gas is seriously influenced.
Disclosure of Invention
The invention aims to provide a bubble point pressure testing method and a bubble point pressure testing device for an underground high-pressure water sample, which are used for solving the problems that the judgment result of the bubble point pressure in the prior art belongs to an estimated value and the development of unconventional gas reservoirs such as water-soluble gas is seriously influenced, realizing the accurate measurement of the bubble point pressure of formation water and providing accurate and reliable geological basis for the development of the water-soluble gas.
The invention is realized by the following technical scheme:
the bubble point pressure testing method of the underground high-pressure water sample comprises the following steps:
(a) connecting an inlet pipeline and an outlet pipeline and a gate of the underground sampler, heating the working environment of the underground sampler to the stratum temperature of the sampled stratum, and vacuumizing the interior of the underground sampler through the outlet pipeline;
(b) injecting formation water into the underground sampler, gradually pressurizing until two ends of the underground sampler are automatically opened, and recording the opening pressure;
(c) vertically placing the underground sampler, enabling an outlet pipeline to be positioned at the top, sequentially connecting a gas-water separator and a gas meter on the outlet pipeline at the top, and carrying out gas release for a plurality of times at a fixed volume from the gas meter until the inside of the underground sampler reaches atmospheric pressure and the gas meter does not automatically exhaust any more; recording the total water quantity entering the gas-water separator as W in the process of a plurality of times of air release1The total gas quantity discharged from the gas meter is Q1；
(d) Continuously and slowly injecting formation water into the underground sampler from the bottom inlet pipeline of the underground sampler until all the water discharged from the top outlet pipeline is water, no gas is separated by the gas-water separator, and recording the amount of the formation water injected in the step as W2The quantity of gas discharged from the gas meter is Q2；
(e) Measuring the amount of formation water W remaining in the downhole sampler, the two-end joint, and the connecting line3And calculating the original gas-water ratio: GWR ═ Q1+Q2)/(W1+W3-W2)；
(f) According to the relation chart of the bubble point pressure and the GWR, the estimated bubble point pressure is Pb0(ii) a Respectively under pressure (Pb)0+2MPa)、Pb0、(Pb0-2MPa) to obtain high pressure formation water, medium pressure formation water, low pressure formation water; substituting high-pressure formation water, medium-pressure formation water and low-pressure formation water as formation water into the steps (a) to (e) to respectively obtain GWR1, GWR2 and GWR3 according to the formula (Pb)0+2MPa，GWR1)、(Pb0，GWR2)、(Pb0-2MPa, GWR3) and carrying out a relation curve of a bubble point and the GWR, and bringing the GWR into the relation curve of the bubble point and the GWR to obtain the underground bubble point pressure Pb.
Aiming at the problems that the judgment result of bubble point pressure in the prior art belongs to an estimation value and the development of unconventional gas reservoirs such as water-soluble gas is seriously influenced, the invention provides a bubble point pressure testing method of an underground high-pressure water sample, which comprises the following steps: connecting the underground sampler with the inlet and outlet pipeline and the gate, and connecting the underground samplerHeating the environment to the formation temperature of the sampled formation, and vacuumizing the interior of the underground sampler through an outlet pipeline; heating to the formation temperature is to simulate the ambient temperature of the formation water in the well, avoiding introducing temperature variations. The vacuum is extracted from the interior of the underground sampler to eliminate the influence of air on the amount of gas to be removed and ensure that no air interference exists in the underground sampler. Step (b): injecting formation water into the underground sampler, gradually pressurizing until two ends of the underground sampler are automatically opened, and recording the opening pressure; the existing downhole sampler can be opened only when the internal and external pressure difference reaches a set value, so that the internal and external pressures of the downhole sampler are ensured to be larger, and the internal sealing effect is kept, therefore, the step can be understood and realized by the technical personnel in the field. Step (c): vertically placing the underground sampler, enabling an outlet pipeline to be positioned at the top, sequentially connecting a gas-water separator and a gas meter on the outlet pipeline at the top, and carrying out gas release for a plurality of times at a fixed volume from the gas meter until the inside of the underground sampler reaches atmospheric pressure and the gas meter does not automatically exhaust any more; recording the total water quantity entering the gas-water separator as W in the process of a plurality of times of air release1The total gas quantity discharged from the gas meter is Q1(ii) a The outlet line is located at the top and thus the inlet line is located at the bottom of the down-hole sampler. High-pressure stratum water in the underground sampler enters a gas-water separator for gas-water separation, and separated gas is measured through a gas meter. The gas meter performs gas release for a plurality of times with a fixed volume until the inside of the underground sampler reaches atmospheric pressure and the gas meter does not automatically exhaust. The process aims at solving the problem that the existing vacuum equipment cannot completely extract vacuum in the underground sampler, so that residual air molecules still exist in the underground sampler, a joint of the underground sampler and a connecting pipeline of the underground sampler, and the residual air is attached to the inner wall of the equipment under the action of fluid viscous force and is not easy to move under the conventional condition. If the gas meter continuously discharges gas, the residual air is extremely easy to disturb, and the gas-gas driving is caused to the residual air by the separated natural gas, so that the accurate measurement of the separated natural gas by the gas meter is influenced. The gas meter is used for carrying out gas release for a plurality of times with fixed volume, and the gas released each timeThe volume is controlled in a small range, so that continuous airflow cannot be formed in the underground sampler and the joint and the connecting pipeline thereof, stable air-air driving cannot be formed under the condition, and residual air is always restrained by the inner wall of the equipment, so that the interference of air on the composition of light hydrocarbons can be obviously eliminated. Recording the total water quantity entering the gas-water separator as W in the process of a plurality of times of air release1The total gas quantity discharged from the gas meter is Q1. Step (d): continuously and slowly injecting formation water into the underground sampler from the bottom inlet pipeline of the underground sampler until all the water discharged from the top outlet pipeline is water, no gas is separated by the gas-water separator, and recording the amount of the formation water injected in the step as W2The quantity of gas discharged from the gas meter is Q2(ii) a The whole process in step (d) is carried out at normal pressure, so that for newly injected formation water, the degassing process is completed, no light hydrocarbon gas is released, and therefore, the newly injected formation water W passes through2Pushing original formation water in the down-hole sampler to enter the gas-water separator completely, and recording the gas quantity discharged by the formation water as Q2. A step (e): measuring the amount of formation water W remaining in the downhole sampler, the two-end joint, and the connecting line3And calculating the original gas-water ratio: GWR ═ Q1+Q2)/(W1+W3-W2). Wherein (Q)1+Q2) For the total gas amount removed, (W)1+W3-W2) And comparing the actual underground water quantity to be measured with the actual underground water quantity to obtain the initial gas-water ratio GWR. Step (f): according to the relation chart of the bubble point pressure and the GWR, the estimated bubble point pressure is Pb0(ii) a Respectively under pressure (Pb)0+2MPa)、Pb0、(Pb0-2MPa) to obtain high pressure formation water, medium pressure formation water, low pressure formation water; substituting high-pressure formation water, medium-pressure formation water and low-pressure formation water as formation water into the steps (a) to (e) to respectively obtain GWR1, GWR2 and GWR3 according to the formula (Pb)0+2MPa，GWR1)、(Pb0，GWR2)、(Pb0-2MPa, GWR3) and carrying out a relation curve of a bubble point and the GWR, and bringing the GWR into the relation curve of the bubble point and the GWR to obtain the underground bubble point pressure Pb. The method is based on the bubble point pressureInterpolation in proportion to gas-water ratio to estimate bubble point pressure Pb0Obtained according to a chart of the relation between the bubble point pressure and the GWR, and taking the value as a reference value, namely the value at the pressure (Pb) respectively0+2MPa)、Pb0、(Pb0-2MPa), respectively obtaining gas-water ratios GWR1, GWR2 and GWR3 of the prepared water sample through the steps (a) to (e), thereby obtaining a relation curve between the bubble point and the GWR, and then bringing the obtained initial gas-water ratio GWR into the relation curve between the bubble point and the GWR to obtain the underground bubble point pressure Pb. Three of the scheme are not limited by the pressure for configuring the stratum water sample, and more accurate relation curves can be obtained by configuring different stratum water under more pressure, so that more accurate underground bubble point pressure Pb value is obtained. In conclusion, the method is simple in operation and calculation and rigorous and reliable in process, solves the problems that in the prior art, bubble point pressure is obtained through a relation chart, a judgment result belongs to an estimated value, and development of unconventional gas reservoirs such as water-soluble gas is seriously influenced, achieves accurate measurement of the bubble point pressure of formation water, and provides accurate and reliable geological basis for development of the water-soluble gas.
Preferably, the method for heating the working environment in the step (a) is as follows: and heating the outer sleeve of the down-hole sampler by a heating belt.
Preferably, the volume of gas released per bleed at the gas meter in step (c) is 50 ml.
Preferably, the method further comprises conveying the gas discharged from the outlet end of the gas meter to a chromatograph for testing.
Preferably, the amount of formation water W remaining in step (e)3The measuring method comprises the following steps: weighing the down-hole sampler together with the joint and the pipeline to obtain M1; blowing a pipeline by using nitrogen, drying the joint and the sampler, and weighing again to obtain M2; w3M1-M2. The residual formation water quantity is solved through the difference value of the front and the rear total masses, and the problem that the residual fluid in a joint pipeline and the like cannot be solved in the prior art is solved.
Preferably, before connecting the down-hole sampler, still include to the down-hole sampler with the low pressure gas leak test: the pressure drop of the underground sampler is required to be less than 0.01MPa in five minutes at a low pressure of less than 2 MPa. Because the method is in a vacuum state when the method is started to operate and then quickly reaches a high-pressure state, compaction sealing is easily formed when tiny leak points leak under the action of large pressure difference between the inside and the outside, and the supposed leak points cannot be found. And in the low pressure range less than 2MPa, the internal and external pressure difference is not enough to form compaction seal, so that leakage points can be effectively found, the accuracy and reliability of leakage test are ensured, and errors caused by leakage to the test process are avoided.
The bubble point pressure testing device for the underground high-pressure water sample comprises an underground sampler, wherein an inlet pipeline of the underground sampler is positioned at the bottom, an outlet pipeline of the underground sampler is positioned at the top, an outlet pipeline of the underground sampler is connected to the inlet end of a gas-water separator, and the outlet end of the gas-water separator is connected to a gas meter; and the vacuum pump is connected with an outlet pipeline of the underground sampler.
Preferably, the outlet end of the gas meter is connected to a chromatograph.
Preferably, a buffer container is arranged between the downhole sampler and the vacuum pump.
Preferably, a densitometer and a viscometer are further connected between the gas meter and the chromatograph.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention relates to a bubble point pressure test method and a test device for an underground high-pressure water sample, which predict bubble point pressure Pb according to interpolation of proportional relation between bubble point pressure and gas-water ratio0Obtained according to a chart of the relation between the bubble point pressure and the GWR, and taking the value as a reference value, namely the value at the pressure (Pb) respectively0+2MPa)、Pb0、(Pb0-2MPa), respectively obtaining gas-water ratios GWR1, GWR2 and GWR3 of the prepared water sample through the steps (a) to (e), thereby obtaining a relation curve between the bubble point and the GWR, and then bringing the obtained initial gas-water ratio GWR into the relation curve between the bubble point and the GWR to obtain the underground bubble point pressure Pb. The method has simple operation and calculation and strict and reliable process, solves the problems that in the prior art, bubble point pressure is obtained through a relation chart, the judgment result belongs to an estimated value, and the non-water-soluble gas is seriously influencedThe problem of the development of the conventional gas reservoir realizes the purpose of accurately measuring the bubble point pressure of the formation water and providing accurate and reliable geological basis for the development of water-soluble gas.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a connection according to an embodiment of the present invention;
FIG. 2 is a chart of gas content versus gas-water ratio fitting in an embodiment of the present invention.
Reference numbers and corresponding part names in the drawings:
1-underground sampler, 2-gas-water separator, 3-gasometer, 4-vacuum pump, 5-chromatograph, 6-buffer container, 7-densimeter and 8-viscometer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
the bubble point pressure testing method of the underground high-pressure water sample comprises the following steps: (a) connecting an inlet pipeline and an outlet pipeline and a gate of the underground sampler, heating the working environment of the underground sampler to the stratum temperature of the sampled stratum, and vacuumizing the interior of the underground sampler through the outlet pipeline; (b) injecting formation water into the underground sampler, gradually pressurizing until two ends of the underground sampler are automatically opened, and recording the opening pressure; (c) vertically placing the underground sampler, enabling an outlet pipeline to be positioned at the top, sequentially connecting a gas-water separator and a gas meter on the outlet pipeline at the top, and carrying out gas release for a plurality of times at a fixed volume from the gas meter until the inside of the underground sampler reaches atmospheric pressure and the gas meter does not automatically exhaust any more; recording the total water quantity entering the gas-water separator as W in the process of a plurality of times of air release1The total gas quantity discharged from the gas meter is Q1(ii) a (d) From downhole samplersThe bottom inlet pipeline continuously and slowly injects formation water into the underground sampler until all the water discharged from the top outlet pipeline is water, the gas-water separator does not separate gas, and the amount of the formation water injected in the step is recorded as W2The quantity of gas discharged from the gas meter is Q2(ii) a (e) Measuring the amount of formation water W remaining in the downhole sampler, the two-end joint, and the connecting line3And calculating the original gas-water ratio: GWR ═ Q1+Q2)/(W1+W3-W2) (ii) a (f) According to the relation chart of the bubble point pressure and the GWR, the estimated bubble point pressure is Pb0(ii) a Respectively under pressure (Pb)0+2MPa)、Pb0、(Pb0-2MPa) to obtain high pressure formation water, medium pressure formation water, low pressure formation water; substituting high-pressure formation water, medium-pressure formation water and low-pressure formation water as formation water into the steps (a) to (e) to respectively obtain GWR1, GWR2 and GWR3 according to the formula (Pb)0+2MPa，GWR1)、(Pb0，GWR2)、(Pb0-2MPa, GWR3) and carrying out a relation curve of a bubble point and the GWR, and bringing the GWR into the relation curve of the bubble point and the GWR to obtain the underground bubble point pressure Pb.
Example 2:
the bubble point pressure test method of the underground high-pressure water sample is based on the embodiment 1, and the method for heating the working environment in the step (a) comprises the following steps: and heating the outer sleeve of the down-hole sampler by a heating belt. The volume of gas released at each bleed at the gas meter in step (c) was 50 ml. And conveying the gas discharged from the outlet end of the gas meter to a chromatograph for testing. The amount of formation water W remaining in step (e)3The measuring method comprises the following steps: weighing the down-hole sampler together with the joint and the pipeline to obtain M1; blowing a pipeline by using nitrogen, drying the joint and the sampler, and weighing again to obtain M2; w3M1-M2. Before connecting the sampler in the pit, still include to the sample in the pit with low-pressure gas leak test: the pressure drop of the underground sampler is required to be less than 0.01MPa in five minutes at a low pressure of less than 2 MPa.
The method is used for testing five layers of underground high-pressure water samples of a certain well in a certain oil field in China, and the testing results of the initial gas-water ratio GWR are as follows:
five-layer underground high-pressure water sample testing gas-water ratio of certain well
As can be seen from the test results in the table above, the gas-water ratio of five layers of underground samples of a certain well generally decreases from the layer I to the layer V in sequence as the burial depth becomes shallower. The gas-water ratio of two underground sample tests tested by the first layer group is relatively higher, and is 3.6068m respectively3/m3And 4.1965m3/m3(ii) a The gas-water ratio of two underground samples tested by the IV group of layers is relatively large, the analysis reason may be that the underground sample with the number of 36 of the sampler leaks, the temperature of the sampling point is 52.2 ℃, the pressure of the sampling point is 10.44MPa, the opening pressure of the underground sample at the opening temperature of 52.2 ℃ is only 6.28MPa, the opening pressure of the other sampler No. 31 is close to the formation pressure, but the gas-water ratio is obviously too high; the opening pressure of the second and the V-th layers is similar to the pressure of a stratum sampling point, the gas-water ratio of two underground sample tests of the V-th layer group is very low and almost does not contain gas, and the gas-water ratios are 0.0266m respectively3/m3And 0.0209m3/m3。
According to the above table and analysis thereof, the gas content of the high-pressure water sample under the well at the V-th layer of a certain well is very little, so that the bubble point pressure and the gas content of the high-pressure water sample can not be measured. The results of the first four layer bubble point pressure and saturated gas content are shown in the following table:
bubble point pressure and saturated gas content of underground high-pressure water sample of certain well
As can be seen from the above table, the water saturation gas content of five layers of stratum of a well decreases from layer I to layer V in sequence; the first layer group and the second layer group of formation water containing gas belong to a supersaturated state, and free gas possibly exists; the stratum water of the third layer group and the stratum water of the fourth layer group are in a saturated state, and the bubble point pressure of the stratum water is equal to the corresponding stratum pressure; group v contained almost no gas.
The bubble point pressure measurements in the above table are fitted to a chart of gas content and gas-water ratio of formation water in the first four layers of the well, as shown in figure 2. It can be seen from fig. 2 that the gas content of formation water in 4 layers before a certain well is comparable to a gas-water ratio chart, but because the formation water during drawing the chart is prepared according to the water sample and the gas sample of the separator of the first layer group and is drawn according to the result of multistage degassing, and the gas content of the water sample in the well in four layers is obtained by single degassing test, the difference is certain. The gas content of the stratum water of the first layer group is slightly higher than the plate value, the second layer group and the third layer group are more consistent with the plate and slightly higher than the plate value, and the gas content of the stratum water of the fourth layer group is slightly higher than the plate value due to lower mineralization degree and temperature. Therefore, the test plate can be verified to have a certain reference value, but the accuracy is limited and can only be used as an estimated value.
Example 3:
the bubble point pressure testing device for the downhole high-pressure water sample of any one of the embodiments comprises a downhole sampler 1, as shown in fig. 1, wherein an inlet pipeline of the downhole sampler 1 is positioned at the bottom, an outlet pipeline of the downhole sampler is positioned at the top, an outlet pipeline of the downhole sampler 1 is connected to an inlet end of a gas-water separator 2, and an outlet end of the gas-water separator 2 is connected to a gas meter 3; a vacuum pump 4 is also included which is connected to the outlet line of the downhole sampler. The outlet end of the gas meter 3 is connected to a chromatograph 5. A buffer container 6 is arranged between the underground sampler and the vacuum pump. And a densimeter 7 and a viscometer 8 are also connected between the gas meter and the chromatograph.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The bubble point pressure testing method of the underground high-pressure water sample is characterized by comprising the following steps of:
(a) connecting an inlet pipeline and an outlet pipeline and a gate of the underground sampler, heating the working environment of the underground sampler to the stratum temperature of the sampled stratum, and vacuumizing the interior of the underground sampler through the outlet pipeline;
(b) injecting formation water into the underground sampler, gradually pressurizing until two ends of the underground sampler are automatically opened, and recording the opening pressure;
(c) vertically placing the underground sampler, enabling an outlet pipeline to be positioned at the top, sequentially connecting a gas-water separator and a gas meter on the outlet pipeline at the top, and carrying out gas release for a plurality of times at a fixed volume from the gas meter until the inside of the underground sampler reaches atmospheric pressure and the gas meter does not automatically exhaust any more; recording the total water quantity entering the gas-water separator as W in the process of a plurality of times of air release1The total gas quantity discharged from the gas meter is Q1；
(d) Continuously and slowly injecting formation water into the underground sampler from the bottom inlet pipeline of the underground sampler until all the water discharged from the top outlet pipeline is water, no gas is separated by the gas-water separator, and recording the amount of the formation water injected in the step as W2The quantity of gas discharged from the gas meter is Q2；
(e) Measuring the amount of formation water W remaining in the downhole sampler, the two-end joint, and the connecting line3And calculating the original gas-water ratio: GWR ═ Q1+Q2)/(W1+W3-W2)；
(f) According to the relation chart of the bubble point pressure and the GWR, the estimated bubble point pressure is Pb0(ii) a Respectively under pressure (Pb)0+2MPa)、Pb0、(Pb0-2MPa) to obtain high pressure formation water, medium pressure formation water, low pressure formation water; substituting high-pressure formation water, medium-pressure formation water and low-pressure formation water as formation water into the steps (a) to (e) to respectively obtain GWR1, GWR2 and GWR3 according to the formula (Pb)0+2MPa，GWR1)、(Pb0，GWR2)、(Pb0-2MPa, GWR3) three pointsAnd (3) carrying the initial gas-water ratio GWR into the relation curve of the bubble point and the GWR to obtain the underground bubble point pressure Pb.
2. The bubble point pressure test method for the downhole high-pressure water sample according to claim 1, wherein the method for heating the working environment in the step (a) is as follows: and heating the outer sleeve of the down-hole sampler by a heating belt.
3. The method for bubble point pressure testing of high pressure water samples downhole as claimed in claim 1, wherein the gas volume released per deflation at the gas meter in step (c) is 50 ml.
4. The method for testing the bubble point pressure of the high-pressure water sample in the well according to claim 1, further comprising the step of delivering the gas discharged from the outlet end of the gas meter to a chromatograph for testing.
5. The method for testing bubble point pressure of a high-pressure water sample in a well according to claim 1, wherein the formation water amount W remained in the step (e)3The measuring method comprises the following steps: weighing the down-hole sampler together with the joint and the pipeline to obtain M1; blowing a pipeline by using nitrogen, drying the joint and the sampler, and weighing again to obtain M2; w3＝M1-M2。
6. The bubble point pressure testing method of the underground high-pressure water sample according to claim 1, characterized by further comprising the following steps of, before connecting the underground sampler: the pressure drop of the underground sampler is required to be less than 0.01MPa in five minutes at a low pressure of less than 2 MPa.
7. The testing device based on the bubble point pressure testing method of the downhole high-pressure water sample according to any one of claims 1 to 6, comprising a downhole sampler, wherein an inlet pipeline of the downhole sampler is positioned at the bottom, an outlet pipeline of the downhole sampler is positioned at the top, the outlet pipeline of the downhole sampler is connected to the inlet end of a gas-water separator, and the outlet end of the gas-water separator is connected to a gas meter; and the vacuum pump is connected with an outlet pipeline of the underground sampler.
8. The bubble point pressure testing apparatus for high pressure water samples downhole according to claim 7, wherein the outlet end of the gas meter is connected to a chromatograph.
9. The bubble point pressure testing device for the underground high-pressure water sample according to claim 7, wherein a buffer container is arranged between the underground sampler and the vacuum pump.
10. The bubble point pressure testing device for the high-pressure water sample in the well according to claim 8, characterized in that a density meter and a viscometer are further connected between the gas meter and the chromatograph.
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