Initial productivity prediction method of shale gas horizontal well

A productivity prediction and shale gas technology, which is applied in earth-moving drilling, wellbore/well components, etc., can solve the problem that the initial productivity prediction method of shale gas horizontal wells has not been carried out, and achieve high productivity prediction accuracy and field practicability. strong effect

Inactive Publication Date: 2015-08-12
EXPLORATION & DEV RES INST OFSINOPEC JIANGHAN OILFIELD
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Problems solved by technology

[0005] At present, the initial productivity prediction method of shale gas horizontal wells usin

Method used

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  • Initial productivity prediction method of shale gas horizontal well
  • Initial productivity prediction method of shale gas horizontal well
  • Initial productivity prediction method of shale gas horizontal well

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Experimental program
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Effect test

Embodiment 1

[0049] In the present invention, the shale gas horizontal well Jiaoye 3HF well in the Jiaoshiba block of Fuling, Sichuan Basin (actually measured production capacity4 m 3 / d) apply. It mainly includes the following steps:

[0050] According to the geological and engineering parameter data table of the horizontal section of Well Jiaoye 3HF, the weighted average calculation shows that the organic carbon content of the well is TOC=2.47%, the brittleness index BI=40.46%, and the single-section liquid volume L=1684m 3 ; Statistically analyze the parameters of existing wells to get the maximum value of TOC TOC max =4.52%, brittleness index BI max =50.14%, single-stage construction fluid volume L max =1924m 3, after normalization of the maximum value, we get: TOC ‾ = 2.47 / 4.52 = 0.54 , BI ‾ = 40.6 ...

Embodiment 2

[0053] The present invention is used in Jiaoye 7-1HF well (actually measured production capacity of 20-50×10 shale gas horizontal wells in Jiaoshiba block, Fuling, Sichuan Basin) 4 m 3 / d) apply. It mainly includes the following steps:

[0054] According to the geological and engineering parameter data sheet of the horizontal section of Well Jiaoye 7-1HF, the weighted average calculation shows that the organic carbon content of the well is TOC=3.38%, the brittleness index BI=49.85%, and the single-section liquid volume L=1582.7m 3 ; Statistically analyze the parameters of existing wells to get the maximum value of TOC TOC max =4.52%, brittleness index BI max =50.14%, single-stage construction fluid volume L max =1924m 3 , after normalization of the maximum value, we get: TOC ‾ = 3.38 / 4.52 = 0 . 75 , BI ‾ ...

Embodiment 3

[0057] According to the present invention, the shale gas horizontal well Jiaoye 11-2HF well in the Jiaoshiba block of Fuling, Sichuan Basin (actually measured production capacity of 50-80×10 4 m 3 / d) apply. It mainly includes the following steps:

[0058] According to the geological and engineering parameter data table of the horizontal section of Well Jiaoye 11-2HF, the weighted average calculation shows that the organic carbon content of the well is TOC=3.9%, the brittleness index BI=46.4%, and the single-section liquid volume L=1820.2m 3 ; Statistically analyze the parameters of existing wells to get the maximum value of TOC TOC max =4.52%, brittleness index BI max =50.14%, single-stage construction fluid volume L max =1924m 3 , the maximum value normalization process gets: TOC ‾ = 3 . 9 / 4.52 = 0 . 86 , B...

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Abstract

The invention, which belongs to the shale gas development field during oil-gas field development, discloses an initial productivity prediction method of a shale gas horizontal well. The method comprises the following steps: establishing a well logging interpretation and construction fracturing parameter database of a shale gas horizontal well; carrying out thickness weighting calculation to obtain relevant single-well geological and engineering parameters; carrying out a multi-factor sensitivity analysis by using an orthogonal test method to determine main controlling factors influencing the productivity of the shale gas horizontal well; and establishing an initial productivity prediction equation of the shale gas horizontal well based on multiple regression linearity and predicting the productivity of a newly-drilled shale gas horizontal well by using the equation as a model. On the basis of comparison of a predicted result and an actual measurement result, the relative error is less than 20%, so that the productivity precondition precision based on the method is high.

Description

technical field [0001] The invention relates to the technical field of shale gas development, in particular to a method for predicting the initial productivity of a shale gas horizontal well. Background technique [0002] Shale gas refers to unconventional natural gas that occurs in organic-rich mud shale and its interlayers, mainly in the state of adsorption or free, and is mainly composed of methane. It is a clean and efficient energy resource. Compared with conventional oil and gas resources, there are mainly the following characteristics. Shale gas accumulates in the places where oil and gas are produced, and accumulates in extremely small pores (nanoscale), with various forms of occurrence, including free, adsorbed and dissolved states. Shale gas resources are rich in reserves , but it is difficult to develop. [0003] As an emerging unconventional energy source, shale gas is an "artificial gas reservoir" that requires large-scale hydraulic sand fracturing. Therefore, ...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 梁榜卢文涛李继庆陆亚秋李争曾勇黄灿
Owner EXPLORATION & DEV RES INST OFSINOPEC JIANGHAN OILFIELD
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