Real-time drilling parameter and efficiency optimization method

An optimization method and drilling parameter technology, applied in drilling equipment, drilling automatic control system, earthwork drilling and production, etc., to achieve the effect of improving drilling efficiency

Inactive Publication Date: 2014-05-14
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0002] The drilling optimization methods in the prior art are all established based on overbalanced drilling. There are many problems when they are used for gas drilling and underbalanced drilling for drilling optimization. Even the optimization for underbalanced drilling is based on the overbalanced drilling optimization model. It cannot be used in the three drilling methods of gas drilling, underbalanced drilling and overbalanced drilling at the same time

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Embodiment Construction

[0028] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] refer to figure 1 , a method for real-time optimization of drilling parameters and efficiency, comprising the following steps:

[0030] The establishment of the calculation model of rock strength at the bottom of A:

[0031] A1 collect rock cores with different porosities for a certain type of rock, and measure the porosity of the collected rock cores;

[0032] A2 Carry out triaxial rock mechanics experiments on rock cores with different porosities, and measure the compressive strength of rocks under different confining pressures;

[0033] A3 uses the particle swarm optimization algorithm to determine the parameters (a, b, c) in the intensity model:

[0034] σ 1 -σ 3 =UCS 0 (1+aσ 3 b )×exp(-φ×c)

[0035] where σ 1 is the triaxial compressive strength of the rock, σ 3 For the test confining ...

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Abstract

The invention discloses a real-time drilling parameter and efficiency optimization method. The method includes: drilling for coring; setting a rock strength model according to a method in a step A; judging which type the drilling mode belonging to according to drilling fluid density, property and formation pore pressure; if the drilling mode belongs to gas drilling, directly using uniaxial compressive strength, and otherwise, calculating the rock strength under the condition of bottom confining pressure; calculating mechanical specific energy of a drill according to logging data; comparing calculated mechanical specific energy of the drill with the rock strength under the bottom confining pressure. Critical fail points of drilling parameters such as drilling pressure, rotate speed and the like can be found out by the model, real-time optimization of the drilling parameters is realized, and drilling capacity can be effectively promoted on the existing basis of drilling.

Description

technical field [0001] The invention relates to a drilling optimization method, in particular to a real-time optimization method of drilling parameters and efficiency. Background technique [0002] The drilling optimization methods in the prior art are all established based on overbalanced drilling. There are many problems in drilling optimization for gas drilling and underbalanced drilling. Even the optimization for underbalanced drilling is based on the overbalanced drilling optimization model. It cannot be used in the three drilling methods of gas drilling, underbalanced drilling and overbalanced drilling at the same time. Contents of the invention [0003] In order to overcome the defects in the prior art, the present invention provides a method for real-time optimization of drilling parameters and efficiency that can be used in three drilling modes: gas drilling, underbalanced drilling, and overbalanced drilling. The method established by the present invention is base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B44/00
Inventor 石祥超孟英峰李皋赵向阳关小旭李家学陶祖文张涛
Owner SOUTHWEST PETROLEUM UNIV
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