Method for acquiring absolute open flow of shale gas layer based on gas productivity index
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A technology of absolute unimpeded flow and unobstructed flow, which is applied in the directions of measurement, earthwork drilling, data processing, etc., can solve problems such as complex seepage mechanism and difficulty in establishing an unobstructed flow model, and achieves the effect of wide application range
Active Publication Date: 2016-08-03
中石化石油工程技术服务有限公司 +1
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For shale gas reservoirs, due to the complex seepage mechanism, it is difficult to establish an applicable open flow model by these methods
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example 1
[0058] Example 1: R2HF well in J work area of a shale gas field
[0059] 1) Obtain 9 tested wells in the J work area (W1H well, W1-2H well, W1-3HF well, W6-2HF well, W7-2HF well, W8-2HF well, W10-2HF well, W11 well -2HF well, W12-3HF well) shale gas layer thickness H, horizontal well section length L, pressure coefficient Kf, porosity POR, gas saturation Sg, organic carbon content TOC and brittleness index Brit;
[0060] 2) Obtain the fracturing fluid volume Vf and fracturing support agent volume Vs used for fracturing shale gas reservoirs in 9 wells that have been tested;
[0061] 3) Obtain the open flow rate AOFg of shale gas formations in 9 wells that have been tested through the test productivity data;
[0062] 4) According to the parameters obtained in step 1) and step 2), the fracturing index IFR, gas index Ig, and gas production index IPG of the 9 tested wells were sequentially calculated;
[0063] 5) The open flow rate AOFg of the shale gas layers of the 9 wells th...
example 2
[0069] Example 2: Well R3HF in J work area of a shale gas field
[0070] 1) The R3HF well and the R2HF well in Example 1 belong to the production wells in the J work area, and the model coefficients A and B calculated and determined by the 9 tested wells in the Example 1 can be used, and the model AOFg=A×e B×IPG The model coefficients A=9.3173, B=0.0238;
[0071] 2) Obtain parameters of shale gas layers in Well R3HF through logging data. The gas layer thickness H of Well R3HF is 40m, the length of horizontal well section L is 13.98m, the average pressure coefficient Kf is 1.45, the average porosity POR is 0.055, and the gas-bearing The average saturation Sg is 0.552, the average organic carbon content TOC is 2.36%, and the average brittleness index Brit is 0.55;
[0072] 3) Obtain the fracturing parameters of the shale gas layer in Well R3HF, and the fracturing fluid volume Vf is 28627.5m 3 , The volume Vs of the fracturing support agent is 1015.4m3;
[0073] 4) Using the...
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Abstract
The invention relates to a method for acquiring absolute open flow of a shale gas layer based on a gas productivity index. The method comprises the following steps of: acquiring shale gas layer parameters of a tested well in a work area, acquiring shale gas layer fracturing parameters of the tested well, and acquiring open flow of the shale gas layer of the tested well by virtue of tested productivity data; sequentially calculating a gas bearing index, a fracturing transformation index and a gas production index of a tested well gas layer by virtue of the acquired parameters, and determining the model coefficient of a model AOFg=A*eB*IPG by virtue of a gas productivity index IPG calculated in a corresponding tested well by utilizing a least square method; and acquiring to-be-predicted well shale gas layer parameters in the work area, acquiring to-be-predicted well shale gas layer fracturing parameters, sequentially calculating a fracturing transformation index, a gas bearing factor and a gas production index of the to-be-predicted well gas layer according to a formula by virtue of the acquired parameters, introducing the gas productivity index into a model AOFg1=A*eB*IPG1, calculating the open flow of the to-be-predicted well shale gas layer, and outputting the calculation result. The method disclosed by the invention is adopted in 30 predicted wells of a certain shale gas field, and the average error does not exceed 20%.
Description
technical field [0001] The invention relates to a method for obtaining the absolute unimpeded flow rate of shale gas layers based on the gas production index, which mainly provides key evaluation parameters for shale reservoir logging interpretation and fracturing reconstruction. Background technique [0002] Unimpeded flow prediction is a very important link in natural gas exploration and development. It is a comprehensive evaluation index for reservoir quality, oil and gas properties of reservoir fluid and its productivity, and it is also one of the most important indexes. [0003] Shale gas refers to the accumulation of natural gas mainly located in dark mud shale or high-carbon mud shale, mainly in the state of adsorption or free. Shale gas reservoirs are characterized by ultra-low porosity and permeability; and part of the gas is adsorbed on the surface of reservoir rock particles and exists in the reservoir in an adsorbed state, which brings difficulties to the interpr...
Claims
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