Method and system for predicting shaft bottom pressure

A technology of bottom hole pressure and pressure loss, which is applied in earth-moving drilling, wellbore/well components, etc., can solve the problem of not considering the influence of drilling cuttings on the rheological parameters of drilling fluid, and achieve the effect of improving the accuracy.

Active Publication Date: 2019-06-07
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

XinLi et al. (2017) disclosed a method for predicting the limit extension length of the open hole considering cuttings, but only considered the inf

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  • Method and system for predicting shaft bottom pressure
  • Method and system for predicting shaft bottom pressure
  • Method and system for predicting shaft bottom pressure

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Embodiment Construction

[0086] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0087] The purpose of the present invention is to provide a method and system for bottom hole pressure prediction, which can improve the accuracy of bottom hole pressure prediction by considering the influence of drill cuttings on drilling fluid rheology.

[0088] In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below ...

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Abstract

The invention discloses a method and system for predicting the shaft bottom pressure. The method comprises the steps: a shaft is sectioned; the drilling cutting concentration of all sections is calculated, and the drilling cutting concentration is the volume concentration of drilling cuttings in annuluses; the effective density and rheological parameters of drilling fluid of all the sections are calculated; annulus pressure losses of all the sections are determined; and according to the annulus pressure losses of all the sections, the shaft bottom pressure is calculated. By considering influences of the drilling cuttings on the rheological property of the drilling fluid, the predicting accuracy rate of the shaft bottom pressure can be increased, and thus the predicted shaft bottom pressureis closer to the real shaft bottom pressure.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas drilling, in particular to a method and system for bottom hole pressure prediction. Background technique [0002] Extended-reach wells are widely used in unconventional formations such as shale gas. The reason why extended-reach wells are widely used is that they have relatively long length contact with the pay zone. During the drilling operation of extended-reach wells, one of the biggest problems is predicting the bottom hole. Pressure, if the prediction of bottom hole pressure is inaccurate, it may lead to some dangerous drilling accidents, such as lost circulation, wellbore instability, stuck pipe, etc. These accidents show that bottom hole pressure prediction is very important in the whole process of drilling operation of. Reliable prediction of bottom hole pressure depends not only on engineering parameters but also on drilling fluid properties such as density and rheology. In ...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 王贵杜辉蒲晓林文杰徐生江刘可成戎克生
Owner SOUTHWEST PETROLEUM UNIV
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