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A Prediction Method of Pore Pressure in Inter-salt Formation

A technology of formation pore pressure and formation pressure, which is applied in earth-moving drilling, wellbore/well components, etc., can solve the problem of grasping the formation mechanism of abnormal pressure, and achieve the effect of strong practicability and high accuracy.

Active Publication Date: 2019-10-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the vast majority of formation pressure predictions are carried out from the perspective of mechanics, and few people grasp the formation mechanism of abnormal pressure macroscopically from the perspective of geology, and select and establish corresponding prediction methods

Method used

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  • A Prediction Method of Pore Pressure in Inter-salt Formation
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  • A Prediction Method of Pore Pressure in Inter-salt Formation

Examples

Experimental program
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Effect test

Embodiment 1

[0062] The invention is applied in the Wangxi 10-3 well in the Wangchang area of ​​Qianjiang Sag. It mainly includes the following steps:

[0063] Using the measured GR curve, acoustic time difference and density of Well Wangxi 10-3 to calculate the shale content V of the measured pressure section sh =0.56, speed V p =5.27km / s, porosity Statistically, the seismic layer velocity v=3324m / s in this section. Calculation of Pore Pressure Using a Pressure Prediction Model

[0064] The relative error between the pressure prediction result and the measured pressure value (33.25Mpa) is calculated, and the relative error is 0.72%

Embodiment 2

[0066] The present invention is applied in Guang 25 Xie-2 well in Guanghua area of ​​Qianjiang Sag. It mainly includes the following steps:

[0067] Calculate the shale content V in the measured pressure section by using the measured GR curve, acoustic time difference and density of Guang 25 Xie-2 sh =0.3, speed V p =3.43km / s, porosity Statistically, the seismic layer velocity v=3109.4m / s in this section. Calculation of Pore Pressure Using a Pressure Prediction Model

[0068] The relative error between the pressure prediction result and the measured pressure value (31.93Mpa) is 1.91%.

[0069] It can be seen from the examples that the forecasting method of the present invention has high forecasting accuracy.

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Abstract

The invention discloses a prediction method for the pore pressure of inter-salt formation. The prediction method comprises the following steps: establishing a database with logging data of a drilled well and actually-measured formation pressure; utilizing a Terzaghi effective stress theory to calculate and analyze vertical effective stress of a well section in pressure test; carrying out statistics on logging curve values of corresponding well sections in the pressure test, and establishing a relevant mathematical formula between the vertical effective stress and logging values; utilizing multiple non-linear fitting to determine model parameters; carrying out statistics on a ratio between the actually-measured formation pressure and predicted formation pressure and layer velocity of corresponding sections; utilizing curve regression fitting to obtain correction coefficients of a model; forming a final model and using the model to predict the formation pressure of a new drilled well. Compared with an actually-measured result, the predicted result has the advantage that the relative error is less than 10%; the prediction accuracy is higher and the site practicability is high.

Description

technical field [0001] The invention relates to shale oil exploration and development technology, in particular to a method for predicting pore pressure in inter-salt formations. Background technique [0002] Studies have shown that the "sweet spots" of inter-salt shale reservoirs are mainly controlled by formation pressure, so a detailed study of inter-salt formation pressure has very important practical significance. [0003] Formation pressure prediction can be divided into two categories: one is to use logging data to predict formation pressure, and the other is to use seismic data to predict formation pressure. [0004] The first category uses logging data to predict formation pressure. There are three methods: A1 traditional method, which is characterized by establishing a compaction trend line, and then estimating the formation pressure according to the degree of deviation of the measured value from the trend line; or establishing a relationship between the measured v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 钟庆良张颖燕莫莉曾晓平
Owner CHINA PETROLEUM & CHEM CORP