Prediction method and prediction device for specific gravity of underground mud

A mud specific gravity and prediction method technology, applied in the field of drilling, can solve the problems that the theoretical model cannot be verified, the construction safety cannot be guaranteed, and the engineering cannot be achieved.

Active Publication Date: 2018-08-28
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

For the current research on this problem, domestic and foreign scholars only stay at the level of theoretical models, that is, to study the influence of temperature and pressure on mud specific gravity based on theoretical models, and cannot verify whether the theoretical model is correct or not. Therefore, the use of This theoretical model has certain "fuzziness" and "uncertainty", especially for HTHP wells, it cannot guarantee the safety of construction, fails to meet engineering requirements, and may easily cause drilling accidents and huge losses

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  • Prediction method and prediction device for specific gravity of underground mud
  • Prediction method and prediction device for specific gravity of underground mud
  • Prediction method and prediction device for specific gravity of underground mud

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[0066] In order to make the purpose, technical solution and advantages of the application clearer, the embodiments of the application will be described in detail below in conjunction with the accompanying drawings. 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 arbitrarily with each other.

[0067] The steps shown in the flowcharts of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0068] Mud density refers to the mass of mud per unit volume, which can be expressed in the form of mud specific gravity, that is, expressed in terms of relative density, that is, the density relative to water. Mud specific gravity is affected by the combination of temp...

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Abstract

The invention discloses a prediction method and a prediction device for specific gravity of underground mud. The prediction method comprises the following steps that the pressure and the temperature of the underground preset depth are obtained; the mud specific gravity of the underground preset depth is predicted according to the pressure and the temperature of the underground preset depth. According to the method, the mud specific gravity of the underground preset depth is accurately predicted based on the pressure and temperature of the underground preset depth, so that the drilling safety is improved, and the well control accident is reduced or even eliminated.

Description

technical field [0001] The present application relates to drilling technology, especially to a method and device for predicting the specific gravity of downhole mud. Background technique [0002] In general, for conventional wells, the influence of temperature and pressure on mud specific gravity can be ignored in the actual drilling process. However, for high temperature and high pressure (HTHP, High Temperature and High Pressure) wells, since the safe density window in HTHP wells is very narrow (that is, the difference between pore pressure and fracture pressure is very small), such construction operations are prone to drilling accidents. According to statistics, in the construction process of non-high-temperature and high-pressure wells, well control accidents accounted for 4% to 5%, which means that in the drilling process of 20 to 25 wells, only one well control accident occurred during the drilling process. However, for HTHP wells, such well control accidents account ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02
Inventor 马跃王伟李怀科肖剑苗海龙耿铁李自立
Owner CHINA NAT OFFSHORE OIL CORP
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