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A kind of well head sampling method of oil and gas well

A technology for oil and gas wells and sampling devices, applied in wellbore/well components, earthwork drilling, etc., can solve problems such as unconsidered, unrepresentative, and inability to perform PVT analysis alone, so as to reduce operating costs and save operating time. Effect

Active Publication Date: 2018-06-01
CHINA FRANCE BOHAI GEOSERVICES
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  • Claims
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Problems solved by technology

The disadvantages of these two methods of sampling are as follows: the first method of sampling does not consider the influence of gravity differentiation and pipeline friction when the formation fluid flows stably in the horizontal surface pipeline, and the formation fluid appears when it flows in the surface manifold. A kind of non-uniform flow, so sampling directly in the surface manifold, the gas-oil ratio of the sample taken is quite different from the real gas-oil ratio of the downhole formation fluid, which is not representative
In the second method of sampling, gas and liquid are sampled separately. When using samples, a certain proportion of gas and liquid samples can only be artificially mixed, which is far different from the real gas-oil ratio of the downhole formation fluid, so only It can be used as a sample preparation for laboratory analysis, but cannot be used for PVT analysis alone

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  • A kind of well head sampling method of oil and gas well
  • A kind of well head sampling method of oil and gas well
  • A kind of well head sampling method of oil and gas well

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Embodiment Construction

[0031] The invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0032] Such as figure 1 As shown, a wellhead sampling method for oil and gas wells, the method requires the use of sampling equipment to change the formation fluid flowing in the horizontal direction into a vertical flow through the sampling equipment, and pass a filter and mixing device in the vertical direction to realize the non-uniform flow of fluid Relatively uniform distribution and flow. After uniform flow, a certain amount of samples are taken at different positions of the circulation channel by using a retractable sampling probe until the special sample bottle is filled. The sampling device includes: an inlet 101, which At one end of the pipeline, the other end is vertically connected with another pipeline through a pipeline connector to form an inlet 101, and the inlet 101 ...

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Abstract

The invention discloses a well head sampling method of an oil and gas well. The well head sampling method includes the steps that formation fluid flowing in the horizontal direction is changed into formation fluid flowing in the vertical direction through a sampling device; in the vertical direction, it is achieved that uneven-flowing fluid is changed into even distribution and flowing fluid through a filtering and mixing device; after the fluid evenly flows, a certain quantity of samples are sampled at different positions of a circulation channel through a stretchable sampling probe till a special sample bottle is full. Under the condition that the well head sampling condition meets PVT analysis of a laboratory, underground fluid samples can be completely replaced with the samples sampled with the sampling method, the sampling time is set during stable-flowing finding production, and meanwhile getting of capacity data of the oil and gas well is not influenced; compared with an underground fluid sampling method, according to the well head sampling method, the operation time is not additionally occupied, a special sampling tool is not required, the operation time of a whole well is saved, and operation cost is reduced.

Description

technical field [0001] The invention relates to a sampling method, in particular to a well head sampling method for oil and gas wells. Background technique [0002] The physical parameters of formation fluid are very important parameters for evaluating the reserves of oil and gas reservoirs. This parameter is obtained through PVT analysis of formation fluid samples in the laboratory. Therefore, the quality of samples used in PVT analysis directly determines whether the evaluation of the oil and gas reservoir is correct or not. [0003] Now there are relatively mature downhole fluid sampling methods and sampling technologies. When downhole fluid sampling is used, special sampling tools need to be lowered into the well, and it takes a certain amount of operating time. During the sampling period, other operations cannot be performed. Therefore, the existing Downhole fluid sampling is expensive. The existing wellhead sampling method is relatively mature, but the purpose of samp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/08
CPCE21B49/086
Inventor 李纪智孙恒君王建勇林炳南毛敏房立文田立强杨毅
Owner CHINA FRANCE BOHAI GEOSERVICES
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