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Bubble point pressure testing method for underground high-pressure water sample and testing device of testing method

A technology of bubble point pressure and testing method, which is applied in the directions of measurement, earthwork drilling and production, wellbore/well components, etc. It can solve the problems that the judgment result is an estimated value and affects the development of water-soluble gas, etc., to achieve accurate and reliable geological basis, and to provide geological Basis, operation calculation simple effect

Active Publication Date: 2020-11-13
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a bubble point pressure test method and a test device for downhole high-pressure water samples, so as to solve the problem that the judgment result of the bubble point pressure in the prior art is an estimated value, which seriously affects the unconventional gas reservoirs such as water-soluble gas. To solve the problem of development, realize the accurate measurement of the bubble point pressure of formation water, and provide accurate and reliable geological basis for the development of water-soluble gas

Method used

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  • Bubble point pressure testing method for underground high-pressure water sample and testing device of testing method
  • Bubble point pressure testing method for underground high-pressure water sample and testing device of testing method
  • Bubble point pressure testing method for underground high-pressure water sample and testing device of testing method

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Effect test

Embodiment 1

[0031] The method for testing bubble point pressure of downhole high-pressure water samples comprises the following steps: (a) connecting the downhole sampler to the inlet and outlet pipelines and the gate, heating the working environment of the downhole sampler to the formation temperature of the sampling formation, and passing the outlet pipeline to Vacuum is drawn inside the downhole sampler; (b) inject formation water into the downhole sampler and gradually pressurize until both ends of the downhole sampler open automatically, and record the opening pressure; (c) place the downhole sampler vertically so that the outlet pipeline Located at the top, the gas-water separator and the gas meter are connected to the top outlet pipeline in sequence, and the gas is released several times with a fixed volume from the gas meter until the downhole sampler reaches atmospheric pressure and the gas meter is no longer automatically exhausted; record several times During the second deflatio...

Embodiment 2

[0033] The bubble point pressure test method of downhole high-pressure water samples, on the basis of Example 1, the method of heating the working environment in step (a) is: heating with a heating tape on the downhole sampler jacket. In step (c), the volume of gas released by each deflation at the gas meter is 50ml. It also includes sending the gas released from the outlet end of the gas meter to the chromatograph for testing. The remaining formation water in step (e) W 3 The measurement method is as follows: weigh the downhole sampler together with the joint and pipeline to obtain M1; blow the pipeline with nitrogen, dry the joint and sampler, and weigh again to obtain M2; W 3 =M1-M2. Before connecting the downhole sampler, the downhole sampler should also be tested for leaks with low-pressure gas: the downhole sampler must be under a low pressure of less than 2MPa for five minutes and the pressure drop should not exceed 0.01MPa.

[0034] Through this example, the downhol...

Embodiment 3

[0045] The bubble point pressure testing device for the downhole high-pressure water sample of any of the above-mentioned embodiments, such as figure 1 As shown, a downhole sampler 1 is included, the inlet line of the downhole sampler 1 is at the bottom, the outlet line of the downhole sampler is at the top, and the outlet line of the downhole sampler 1 is connected to the inlet end of the gas-water separator 2, and the gas-water The outlet end of the separator 2 is connected to the gas meter 3; it also includes a vacuum pump 4 connected to the outlet pipeline 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 downhole sampler and the vacuum pump. A density meter 7 and a viscometer 8 are also connected between the gas meter and the chromatograph.

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Abstract

The invention discloses a bubble point pressure testing method for an underground high-pressure water sample and a testing device of the testing method. The method comprises the following steps that the bubble point pressure Pb<0> is estimated according to the interpolation of the proportional relation between the bubble point pressure and the gas-water ratio, the bubble point pressure Pb<0> is obtained according to the bubble point pressure and a GWR relation chart, the value is taken as a reference value, stratum water samples are correspondingly prepared under pressure (Pb<0> + 2MPa), Pb<0>and (Pb<0>-2MPa), the gas-water ratios of GWR1, GWR2 and GWR3 of the prepared water samples are correspondingly solved through steps (a)-(e) so as to draw a relation curve between a bubble point andGWR, and the obtained original gas-water ratio GWR is introduced into the relation curve of the bubble point and the GWR to obtain an underground bubble point pressure Pb. The bubble point pressure testing method is simple in operation and calculation and rigorous and reliable in process, the problems that in the prior art, the bubble point pressure is obtained through a relation chart, a judgmentresult belongs to an estimated value, and development of unconventional gas reservoirs such as water-soluble gas reservoirs is seriously influenced are solved, the purposes that the bubble point pressure of formation water is accurately measured, and an accurate and reliable geological basis is provided for water-soluble gas development are achieved.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a bubble point pressure test method and a test device for downhole high-pressure water samples. Background technique [0002] In the field of oil and gas geology, the bubble point pressure is the pressure at which the system pressure is gradually reduced under constant temperature conditions. When the liquid mixture begins to vaporize and the first bubble appears, it is the pressure when a hydrocarbon system is in the bubble point state. Field personnel often refer to the bubble point pressure as the saturation pressure. During reservoir development, the reservoir pressure should be kept higher than the bubble point pressure as much as possible to avoid natural gas precipitation. Because the precipitation of natural gas in the oil layer will consume energy, increase resistance, increase the viscosity of underground crude oil, and reduce oil recovery. Therefore, the ...

Claims

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Application Information

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IPC IPC(8): E21B49/08E21B47/06
CPCE21B49/08E21B47/06
Inventor 胡义升欧露星郭平杜建芬汪周华刘煌
Owner SOUTHWEST PETROLEUM UNIV
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