A general prediction method of formation fracture pressure

A technology of formation rupture pressure and prediction method, applied in soil material testing, special data processing applications, instruments, etc., to achieve the effect of simple calculation

Active Publication Date: 2019-01-18
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0003] To sum up, at present there is no comprehensive consideration of multiple factors, more effective and more accurate method suitable for various formations to predict formation fracture pressure

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  • A general prediction method of formation fracture pressure
  • A general prediction method of formation fracture pressure
  • A general prediction method of formation fracture pressure

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Embodiment Construction

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0050] refer to figure 1 , a general formation fracture pressure prediction method, comprising the following steps:

[0051] 1) Obtain formation rock parameters through indoor hydration triaxial compression test, formation rock parameters include rock compressive strength, elastic modulus and Poisson's ratio;

[0052] Testing the compressive strength, modulus of elasticity, and Poisson's ratio of rocks includes the following steps:

[0053] 1.1) Preparation of standard cylindrical rock samples: Prepared according to the recommended standards of the International Society of Rock Mechanics (ISRM), process the taken out rock sample cores into cylindrical standard samples with a diameter of 25.4 mm and a height of 50 mm, and the flatness of the end surface is 0.1mm;

[0054] 1.2) Soak three sets of standard cylindrical rock samples prepared in step 1.1) ...

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Abstract

A general method for predicting formation fracture pressure is disclosed. At first, formation rock parameter are obtained by hydration triaxial compression experiment, and then the ground stress testdata of the formation are obtained through the in-situ formation fracturing test, other conventional data required for the calculations are then collected, based on elastoplastic mechanics, rock mechanics and double effective stress theory, considering the influence of in-situ stress field, wellbore internal pressure, chemical field, temperature field, rock porosity and drilling fluid seepage flow, a fracture pressure model based on dual effective stress is established according to the maximum tensile stress criterion, and the fracture pressure of formation is calculated according to formation rock parameters and test data. The invention can predict fracture pressure more effectively and accurately, and is suitable for various formations, thereby providing data reference for fracturing operation design and guiding engineering practice.

Description

technical field [0001] The invention relates to the technical field of stratum fracture pressure prediction, in particular to a general method for predicting stratum fracture pressure. Background technique [0002] Accurate prediction of formation fracture pressure is of great significance to prevent drilling accidents and ensure successful fracturing. In the prior art, models include Huang's model, Li's model, Deng's model, etc., among which Huang's model is mainly proposed for general reservoirs, which generally considers the influence of various factors, not only considering the rock formation The overlying stress is a function of depth, the effect of stress concentration on the wellbore wall, and the effect of the non-uniform distribution of underground structural stress and the strength of rock formations are also taken into account. Therefore, it can be applied to areas with different conditions, and the predicted rupture pressure will be more accurate and reliable th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01N33/24
CPCG01N33/24G06F30/20
Inventor 赵晓姣屈展樊恒薛朝妹高怡毛艳慧武丹
Owner XI'AN PETROLEUM UNIVERSITY
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