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Prediction method of temperature and pressure in wellbore for injection-production process

A prediction method, a technique for wellbore temperature, applied in surveying, earthmoving, wellbore/well components, etc., which can solve problems such as no fluid return or injection process considerations

Active Publication Date: 2020-06-09
PETROCHINA CO LTD
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Problems solved by technology

However, although the existing calculation models consider the heat-mass coupling transfer law between the wellbore and the oil layer, the models are all single-pass injection or production processes, and do not take liquid return or injection processes into consideration in combination with the actual injection or production string structure. in the model

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  • Prediction method of temperature and pressure in wellbore for injection-production process
  • Prediction method of temperature and pressure in wellbore for injection-production process
  • Prediction method of temperature and pressure in wellbore for injection-production process

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Embodiment Construction

[0037] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0038] The invention relates to a method for predicting the temperature and pressure in the wellbore during the injection-production process. The method for predicting the temperature and pressure in the wellbore used in the injection-production process of the present invention is applicable to the prediction of the temperature and pressure in the wellbore in the injection-production process with complex string structures.

[0039] It should be noted that the complex string structure mentioned in this embodiment is a simple string structure that is different from a single casing and a single tubing in an oil well. The string structure that achieves different purposes with one tubing is called ...

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Abstract

The invention provides a method for predicting the temperature and the pressure of a shaft in an injection-production process. The method includes: calculating physical parameters of a two-phase flow;acquiring the pressure distribution P1 of the shaft; a step S3, calculating the heat exchange amount Q in an infinitesimal section 1 if the dryness is not 0 or 1, acquiring the volume fraction of gasx1 according to the heat exchange amount Q, using a T1 and the x1 to replace initial hypothetical T0 and x0 after suitable loosening, repeating the step S1 till an absolute value of difference between the T0 and the T1 is less than a first preset value and an absolute value of difference between the x0 and the x1 is less than a second preset value; calculating the heat exchange amount Q in the infinitesimal section 1 if the dryness is 0 or 1, acquiring the T1 according to the heat exchange amount Q, using the T1 to replace the initial hypothetical T0 after suitable loosening, repeating the step S1 till an absolute value of difference between the T0 and the T1 is less than a third preset value. The method can predict the temperature and the pressure of the shaft of a complex tubular columnstructure in the injection-production process.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for predicting the temperature and pressure in a wellbore used in an injection-production process. Background technique [0002] Since Canada drilled the first heavy oil thermal recovery horizontal well in the Cold Lake Oilfield of Alberta in 1978, horizontal well technology has received more and more attention and application, and has continuously developed into an effective method for heavy oil production. . The use of horizontal well technology can significantly increase the contact and seepage area between the wellbore and the oil layer, and improve the production and recovery of a single well. The application of horizontal well heavy oil thermal recovery technology mainly includes horizontal well steam huff and puff and steam flooding, horizontal well steam-assisted gravity drainage, horizontal well fire flooding, etc. During the production process of thes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06E21B47/07
Inventor 张雪峰陈龙潘竟军胡承军张辉姚满仓雷德荣
Owner PETROCHINA CO LTD
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