Method for evaluating reservoir fluid property through gasometry component ratio

A technology for the properties and composition of reservoir fluids, which is applied in earth-moving drilling, wellbore/well components, construction, etc. It can solve problems such as poor interpretation coincidence rate and achieve the effect of flexible use.

Active Publication Date: 2015-01-21
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

The interpretation effect is better for deep oil and gas reservoirs or primary oil and gas reservoirs; for the oil and gas reservoirs after secondary transformation, especially shallow severely biodegraded oil and gas reservoirs, the interpretation coincidence rate is poor

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  • Method for evaluating reservoir fluid property through gasometry component ratio
  • Method for evaluating reservoir fluid property through gasometry component ratio
  • Method for evaluating reservoir fluid property through gasometry component ratio

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Embodiment Construction

[0064] The method provided by the present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0065] A method for evaluating the properties of reservoir fluids using the ratio of gas components, comprising the steps of:

[0066] 1)I Tn Calculation of series indices

[0067] Methane C detected by gas logging 1 , ethane C 2 , propane C 3 , Butane C 4 (sum of normal isomers) and pentane C 5 The (sum of normal isomers) hydrocarbon parameter is the amount of gaseous hydrocarbon components detected while drilling. The present invention defines and calculates the following set of indices:

[0068] I T1 =1-(C 2 ) / (0.2·(C 1 +C 2 ))

[0069] I T2 =1-(C 2 +C 3 ) / (0.2·(C 1 +C 2 +C3))

[0070] I T3 =1-(C 2 +C 3 +C 4 ) / (0.2·(C 1 +C 2 +C 3 +C 4 ))

[0071] I T4 =1-(C 2 +C 3 +C 4 +C 5 ) / (0.2·(C 1 +C 2 +C 3 +C 4 +C 5 ))

[0072] Substituting the gas measurement compone...

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Abstract

The invention provides a new method for evaluating the reservoir fluid property through the gasometry component ratio based on gas logging data. The method includes the steps of firstly, calculating ITn serial indexes; secondly, explaining the application method according to the ITn serial indexes; thirdly, drawing an explanation drawing according to the well depth corresponding to an IT index. Compared with the prior art, according to the method, great innovation is achieved for an existing triange method, and a new explanation drawing application form is established. The quantized ITn serial indexes can be combined with other gasometry parameters and even logging parameters, use is flexible, and convenience is provided for hydrocarbon reservoir evaluation.

Description

technical field [0001] The invention relates to a method for evaluating fluid properties of oil and gas reservoirs based on gas component ratios by using gas logging data, and belongs to the technical processing field of conventional gas logging data data. Background technique [0002] Gas logging is a mud logging method that uses a gas detection system or detects and analyzes the content of hydrocarbon gases separated from the drilling fluid through the drilling fluid degasser at a certain period. It can detect oil and gas shows in time, predict well kicks, Blowout, gas invasion, comprehensive evaluation of reservoirs. The essence of gas logging is to analyze and judge whether there are oil and gas layers with industrial value by analyzing the composition and content of combustible gas entering the drilling fluid during the drilling process. That is to say, by analyzing the gas content in the drilling fluid, it can be directly Measure the content and composition of natural...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/086E21B49/0875
Inventor 余明发庄维
Owner BC P INC CHINA NAT PETROLEUM CORP
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