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Method for calculating fracture pressure of ultra deep well formations

A fracturing pressure, ultra-deep well technology, applied in earth-moving drilling, wellbore/well components, measurement, etc., can solve problems such as failure to accurately predict ultra-deep formation fracturing pressure and unsatisfactory prediction accuracy, etc. To achieve the effect of improving the calculation accuracy

Active Publication Date: 2013-07-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, its prediction accuracy is still not satisfactory
[0005] Especially for ultra-deep well formations in carbonate rocks, there is currently no calculation method that can accurately predict the fracture pressure of such ultra-deep formations

Method used

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  • Method for calculating fracture pressure of ultra deep well formations
  • Method for calculating fracture pressure of ultra deep well formations
  • Method for calculating fracture pressure of ultra deep well formations

Examples

Experimental program
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Effect test

Embodiment 1

[0055] According to the well logging curve of Well TP7 in the Tuofutai block of Tahe River, the dynamic elastic modulus of the 6549m reservoir is calculated to be 72.153GPa, and the dynamic Poisson's ratio is 0.287. The static elastic modulus of the reservoir is calculated by the dynamic and static correlation formulas of rock mechanics parameters to be 46.57GPa, and the static Poisson's ratio is 0.272. Through the inversion model of in-situ stress, the maximum and minimum horizontal principal stresses of the reservoir are calculated to be 134MPa and 105MPa, respectively. Using software analysis, it is calculated that the temperature of the liquid when it reaches the reservoir is 85.7°C.

[0056] Based on these data, using the above formula, it can be obtained that when T7 is at a depth of 6549m, the fracture pressure of the formation is 113.3MPa, and the fracture pressure value measured according to the field construction curve is 109.6MPa, and the error between the two is 3....

Embodiment 2

[0060] According to the well logging curve of Well TP17 in the Tuofutai block of Tahe River, it is calculated that the dynamic elastic modulus of the 6844.4m reservoir is 71.909GPa, and the dynamic Poisson's ratio is 0.293. The static elastic modulus of the reservoir is calculated by the dynamic and static correlation formulas of rock mechanics parameters to be 46.112GPa, and the static Poisson's ratio is 0.282. Through the inversion model of in-situ stress, the maximum and minimum horizontal principal stresses of the reservoir are calculated to be 126MPa and 95MPa, respectively. Using software analysis, it is calculated that the temperature of the liquid when it reaches the reservoir is 89.2°C.

[0061] Based on these data, using the above formula, it can be obtained that the fracture pressure of TP17 at the depth of 6844.4m is 102.5MPa. The rupture pressure value measured according to the field construction curve is 109.2MPa, and the error between the two is 4.58%.

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Abstract

The invention provides a method for calculating the fracture pressure of ultra deep well formations. The method is based on an elastic theory, a pore elastic theory and a thermoelasticity theory, various factors which can influence the calculation precision are comprehensively taken into consideration, and compared with the calculating method of the prior art, the method is utilized for greatly increasing the calculation precision. The difference between a calculation result obtained by a fracture pressure prediction model of the method and the fracture pressure obtained by calculating according to practical field log data is within 10%. The method is particularly suitable for carbonate rock ultra deep well formations.

Description

technical field [0001] The invention relates to the technical field of fracturing and stimulation of oil and gas wells, in particular to a calculation method for predicting the formation fracture pressure of ultra-deep carbonate wells. Background technique [0002] In the production operation of oil and gas wells, it is very important to predict formation fracture pressure. Huang's rupture pressure prediction model is usually used in the prior art. This model is mainly proposed for general reservoirs, and it generally takes into account the influence of various factors, not only considering that the overlying stress of the strata is a function of depth, the influence of stress concentration on the wellbore wall, but also considering the uneven distribution of underground The role of tectonic stress, as well as factors such as rock formation strength. Therefore, it can be applied to areas with different conditions, and the predicted rupture pressure will be more accurate an...

Claims

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Application Information

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IPC IPC(8): E21B47/06E21B49/00
Inventor 赵晓张劲张波张旭东张保平张旭姚奕明王雷周林波周健李洪春陈琼
Owner CHINA PETROLEUM & CHEM CORP
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