Interpretation and Evaluation Method for Water Layer Identification Using q-parameter of Mud Logging While Drilling

Abstract

The invention discloses an interpretation and evaluation method for identifying water layers by using Q parameters of mud logging while drilling, comprising the following steps: a. collecting and arranging mud logging engineering parameters and geological parameters of target layers; b. using mud logging engineering parameters and geological parameters Calculate the response value of the mud logging Q parameter; c, draw a graph according to the response value of the mud logging Q parameter; d, use the discriminant chart to identify the development of the water layer while drilling. The invention utilizes the advantages of timely, high-efficiency, real and rapid interpretation of mud logging hydrocarbon value parameters while drilling, and comprehensively uses mud logging engineering and geological parameters to identify the development of water layers while drilling.

Description

technical field [0001] The invention relates to an interpretation and evaluation method for identifying water layers by using Q parameters of mud logging while drilling, and belongs to the application field of logging data processing technology while drilling in the field of oil and gas industry exploration and development in the electromechanical field. Background technique [0002] Mud logging, through the systematic and continuous observation and description of geological and engineering phenomena during the drilling operation, and at the same time record, analyze and evaluate the relevant parameters through the installed detectors, so as to fully understand the underground geological conditions at the first time, and provide engineering Measures and geological schemes provide decision-making basis and are an important means of discovering oil and gas reservoirs. [0003] In 2013, the largest single carbonate gas reservoir in China was discovered in the Sichuan-Chongqing ...

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Problems solved by technology

[0005] 1. Reservoir and fluid property identification is the focus and difficulty of the mud logging industry. At present, the mud logging industry has introduced some mud logging interpretation technologies to interpret and process the mud logging data from different angles, and solve the problems in some areas to a certain extent. However, progress in mud logging while drilling fluid interpretation technology has been slow. Last year, Chuanqing Company developed a mud logging interpretation technology that uses logging data while drilling to identify reservoirs and fluid properties. Although Relatively fast and efficient interpretation has been achieved, but it is greatly affected by interference factors such as drilling fluid treatment and tripping, and is easily affected by interference factors to cause misjudgment. New technologies with relatively stable raw data and simple identification methods are urgently needed

[0006] 2. The key to identification technology of mud logging reservoir and fluid properties lies in the discriminant mode. The discriminative mode of the previous method has the following problems: 1. The identification is cumbersome and difficult to master and popularize. For example, the gas triangulation chart used by the French geological service company (GEOSERVICE) , there are many judgment items, and the key to identifying fluid properties with this technology is to draw the water production area on the triangular chart based on the scatter diagram established by the existing oil test and gas test results. Exploring the edge of the well is difficult

[0007] 3. The original data is not reliable enough, and the in-depth processing is difficult: In practice, the problems of low reliability of original data and prominent objective and subjective interference factors have been exposed

[0008] 4. Water layer identification is the difficulty of fluid identification in mud logging interpretation: At present, tracking and interpretation evaluation of mud logging while drilling is developing rapidly, and a series of interpretation methods have been developed, such as hydrocarbon ratio curve and fluid discrimination chart method, which have solved the problem of sand-shale mudstone to a certain extent. Discrimination of formation fluids, but there are still some difficulties in the identification of dry layers and water layers

[0009] 5. The identification of new technology water layers is faced with interference from many factors: in 2013, the S‐T technology that needs to be developed according to the logging interpretation of Sinian exploration and development can clearly distinguish gas layers and non-gas reservoirs, but there are many interference factors and it is difficult to There are big problems in the identification of water layer and dry layer, and the identification of fluid properties faces many difficulties. A new technology is urgently needed to obtain satisfactory results in water layer identification from a new perspective.

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