A coalbed methane recovery prediction method based on permeability and well spacing
A prediction method and recovery factor technology, applied in the direction of instrumentation, design optimization/simulation, calculation, etc., can solve the problems of few factors to consider, high reliability of prediction indicators, and low reliability of prediction results, so as to reduce workload and predict Reliable results, easy to apply effects
Active Publication Date: 2019-03-22
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
[0003] The present invention aims to solve the technical problem that the traditional coalbed methane recovery prediction method has few considerations and low reliability of prediction results. It provides a coalbed methane recovery prediction method based on permeability and well spacing, which is used for rapid Predict the recovery rate of coalbed methane, and the prediction index is highly reliable
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[0042] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:
[0043] Such as figure 1 As shown, referring to the geological parameters of a certain coalbed methane block in Linxing, with the initial gas saturation as the theoretical ideal value of 100%, the simplified model of coalbed methane was established by using the numerical simulation technology software Eclipse. The simplified models all adopt square well patterns and deploy 4 drainage wells.
[0044] Select permeability and well spacing as the main factors affecting the recovery of coalbed methane, and determine its range of variation. The range of permeability is 0.01-100×10 3 μm 2 , the range of well spacing is 200-800m. Taking permeability and well spacing as the main factors affecting the recovery of coalbed methane is based on the fact ...
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The invention relates to the technical field of coalbed methane and discloses a coalbed methane recovery ratio prediction method based on permeability and well spacing. The method comprises the following steps: establishing a coalbed methane block simplified model by use of a numerical simulation technology, and calculating final recovery ratio under different well spacing and permeability conditions; drawing a recovery ratio equivalent curve by taking the well spacing of the calculation result as an x coordinate and the logarithm of the permeability as a y coordinate to form a coalbed methane recovery ratio prediction plate; regressing the relation between initial gas saturation and recovery ratio primary correction factor so as to perform first correction of the recovery ratio value of the prediction plate; and regressing the relation between the isothermal adsorption curve characteristic factor and the recovery ratio secondary correction factor so as to perform second correction of the recovery ratio value of the prediction plate and realize better universality of the plate. In the invention, the recovery ratio of a coalbed methane block can be quickly predicted according to the well spacing, the permeability, the gas saturation and the isothermal adsorption curve; and existing coalbed methane recovery ratio prediction method is enriched.
Description
technical field [0001] The invention relates to the technical field of prediction of recovery rate in coalbed methane development, in particular to a method for predicting recovery rate of coalbed methane based on permeability and well spacing. Background technique [0002] At present, the prediction methods of coalbed methane recovery mainly include: analogy method, desorption method, gas content reduction estimation method, isothermal adsorption curve method and gas reservoir numerical simulation method, etc. Among them, the process of determining recovery by analogy is relatively simple, and the result mainly depends on the reliability of geological data, the degree of understanding of the researcher's geological conditions in the study area and the analogy area, as well as the technical level and experience of the researcher. It is used in relatively high areas; the recovery rate of coalbed methane determined by the desorption method will be affected by relevant geologic...
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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 尹彦君冯毅蔡振华段宝江刘灵童王文升姚为英
Owner CHINA NAT OFFSHORE OIL CORP