Method for determining volume of gas well drilling karst cave system by utilizing production dynamic data
A technology for production dynamics and data determination, which is applied in the fields of electrical digital data processing, special data processing applications, earthwork drilling and mining, etc. It can solve the problems of complex applications, large prediction errors of effective storage space volume in karst cave systems, multiple solutions, etc. question
Active Publication Date: 2021-01-26
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
For wells that encounter karst caves, lost circulation generally occurs during the drilling process. Conventional logging and imaging logging can determine the size of the karst cave along the one-dimensional direction of the well trajectory, but it is difficult to determine the development of the karst cave system in the three-dimensional space. Size and volume
[0003] At present, there are mainly two types of methods for determining the range or volume of the cave system in underground oil and gas reservoirs: one is to invert and predict the development range of the cave system by combining seismic and logging information, and the results obtained by this method are affected by the cavern system. Influenced by the uncertainty of the filling type and filling degree in the system, the prediction error of the volume of the effective storage space in the karst cave system is relatively large; the other type is the well test interpretation method, which is based on the geological understanding of the reservoir characteristics of the oil and gas reservoir , establish a corresponding theoretical model or numerical simulation model and solve it, match it with the actual well test data, and give the interpretation result of the size of the cave. The application of this type of method is relatively complicated, and there are multiple solutions
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings, tables and examples.
[0034] For such as figure 1 The method for determining the volume of the karst cave system encountered by the gas well when drilling the karst cave gas well by using the production performance data includes the following steps:
[0035] 1. Based on the logging response characteristics and whether lost circulation occurs during drilling, preliminarily judge whether the production gas well has encountered a karst cave. Such as figure 2 As shown, the well is in the 5157.5-5159.6m interval, the caliber (CAL) curve is abnormally enlarged, the acoustic wave travel time (AC) curve is abnormally high, the density (DEN) logging curve is abnormally low, and the resistivity (RT) curve is abnormal obviously decased. In addition, lost circulation occurre...
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The invention discloses a method for determining the volume of a gas well drilling karst cave system by utilizing production dynamic data. The method comprises the following steps of preliminarily judging whether a production gas well drills a karst cave or not based on logging response characteristics and whether a well leakage phenomenon occurs or not in a drilling process; aiming at a gas wellwith logging response characteristics displaying drilling karst caves, collecting and arranging production dynamic data of the gas well; judging whether the karst cave drilled by the gas well communicates with a large karst cave system or not based on the production dynamic data at the initial production stage of the gas well; and aiming at a production gas well directly communicating with a largekarst cave, quantitatively calculating the volume of the gas well communicating with the karst cave system by utilizing the linear relationship between the apparent pressure and the accumulated gas production rate calculated on the basis of production dynamic data and geological data at the initial stage of production. According to the method, a quantitative reference basis is provided for knowing the karst effect development degree of a gas reservoir.
Description
technical field [0001] The invention relates to the technical field of dynamic monitoring of gas reservoir development, in particular to a method for determining the volume of a gas well drilling encountered karst cave system by using production dynamic data. Background technique [0002] Cave systems are usually developed in carbonate strata that have been subjected to karst karstification during geological history. For wells that encounter karst caves, lost circulation generally occurs during the drilling process. Conventional logging and imaging logging can determine the size of the karst cave along the one-dimensional direction of the well trajectory, but it is difficult to determine the development of the karst cave system in the three-dimensional space. size and volume. [0003] At present, there are mainly two types of methods for determining the range or volume of the cave system in underground oil and gas reservoirs: one is to invert and predict the development ran...
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IPC IPC(8): E21B47/00E21B49/00G06F30/20G06F30/28G06F113/08G06F119/14
CPCE21B47/00E21B49/00G06F30/20G06F30/28G06F2113/08G06F2119/14
Inventor鲁洪江尹云锋郭波邹江海巫旭狄吴杰陈克勇祝鹏杨洪志徐伟鲁杰邓惠张春
OwnerCHENGDU UNIVERSITY OF TECHNOLOGY