A method for judging and predicting the main controlling factors of productivity in fracturing horizontal wells in tight oil
A technology of main control factors and horizontal wells, applied in prediction, data processing applications, instruments, etc., can solve the problems of low productivity prediction accuracy and difficult evaluation, and achieve the effect of improving evaluation accuracy, meeting production needs, and high coincidence
Active Publication Date: 2021-09-21
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology
[0021] The purpose of the present invention is to overcome the shortcomings of the existing technical solutions, such as the difficulty in judging the main control factors of the production capacity of tight oil fracturing horizontal wells and the low accuracy of production prediction, and to provide a main control of the production capacity of tight oil fracturing horizontal wells based on the gray correlation method. The method of factor evaluation and productivity prediction improves the accuracy of productivity master factor evaluation and productivity prediction, and adapts to the development needs of tight oil reservoirs
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[0064]This embodiment relates to a method for judging and predicting the main controlling factors of the productivity of a tight oil fracturing horizontal well, including the following steps:
[0065] Step 1: For the production of fractured horizontal wells in the tight oil blocks to be studied, determine the potential influencing factors of the productivity of tight oil fractured horizontal wells from three aspects: geological factors, development factors and engineering factors;
[0066] Step 2: Clarify the internal relationship of potential influencing factors on productivity, eliminate appearance factors and overlapping factors, and establish a comprehensive evaluation system for fractured horizontal well productivity suitable for the study area;
[0067] Step 3: Obtain relevant data according to the comprehensive evaluation index system of production capacity;
[0068] Step 4: Use the gray correlation analysis method to calculate the correlation between influencing factor...
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The present invention provides a method for judging and predicting the main controlling factors of the production capacity of fracturing horizontal wells in tight oil; determining the potential influencing factors of the production capacity of fracturing horizontal wells in tight oil; and establishing a comprehensive evaluation system for the production capacity of fracturing horizontal wells adapted to the research area; Obtain relevant data; judge the main controlling factors of the productivity of fractured horizontal wells in the research area; calculate the weight ratio of the main controlling factors in the classification; establish the productivity level prediction formula of the fractured horizontal wells in the research area; establish the productivity of the fractured horizontal wells in the research area The decline prediction model predicts the law of oil well productivity decline. The production capacity of tight oil fracturing horizontal wells predicted by the production capacity prediction method proposed in the present invention has a high degree of agreement with the field production data. Compared with the oil production data of one horizontal well and the prediction results, the relative error is less than 7%, and the prediction accuracy is high, which can meet production needs.
Description
technical field [0001] The invention relates to the field of tight oil development; in particular, it relates to a method for judging main controlling factors of production capacity of fracturing horizontal wells in tight oil and for predicting production capacity. Background technique [0002] At present, tight oil has become one of the most important unconventional oil and gas resources in the world. China is rich in tight sandstone oil and gas resources, which are widely distributed in the Junggar Basin, Ordos Basin, Sichuan Basin, and Songliao Basin. The preliminary evaluation of tight oil resources in major basins is 8-10 billion tons (Jia Chengzao et al., 2012; Zou Cai et al., 2012 ). With the development of technologies such as acid fracturing, multi-stage fracturing and long horizontal wells, the development effect of tight oil reservoirs has been significantly improved, and it is expected to become an important oil and gas replacement resource, alleviate my country...
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IPC IPC(8): G06Q10/04G06Q10/06G06Q50/02G06F17/11
CPCG06F17/11G06Q10/04G06Q10/0639G06Q50/02
Inventor 王铭显谭成仟邱祥亮成友友陈志鹏赵文琪李伟强邢国强赵红兵
Owner XI'AN PETROLEUM UNIVERSITY