Method for analyzing stability of directionally-penetrated hole
A technology of directional traversal and analysis method, applied in the fields of instrumentation, electrical digital data processing, computer-aided design, etc., can solve the problems of borehole shrinkage, over-diameter, collapse, etc., and achieve the effect of maintaining wellbore stability
Inactive Publication Date: 2020-07-03
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology
However, while the horizontal directional drilling technology is convenient for construction, there are also many construction risks. The stability of the hole wall is mainly manifested in the shrinkage, collapse, and overdiameter of the borehole, and even serious ground subsidence and damage to adjacent structures on the ground and above the ground.
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[0052] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0053] Such as figure 1 As shown, the embodiment of the present invention describes a method for analyzing the stability of a directional penetrating hole, and the method includes:
[0054] Step 1. Establish a rock-soil constitutive model for directional penetration holes. When using the directional drilling crossing technology to realize the laying of oil and gas pipelines, the target layer to be traversed is mainly rock and soil, and its mechanical strength is low. A reasonable rock and soil constitutive model must be established when analyzing the hole stability.
[0055] Step 2. Establish a stress distribution model of the rock and soil around the directional penetration hole;
[0056] Step 3. Perform a numerical simulation analysis on the stability of the directional penetration hole based on the rock and soil constitutive model of ...
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The invention discloses a method for analyzing the stability of a directionally-penetrated hole. The method comprises the following steps: step 1, establishing a rock-soil constitutive model of the directionally-penetrated hole; step 2, establishing a stress distribution model for directionally penetrating through rock and soil around the hole; step 3, according to the rock-soil constitutive modelof the directional crossing hole and the stress distribution model of the rock-soil around the directional crossing hole established in the step 1 and the step 2, numerical simulation analysis is carried out on the stability of the directional crossing hole; and step 4, obtaining a corresponding prevention measure according to an analysis result in the step 3. The method has the beneficial effects that the stability of the through hole is evaluated by analyzing the property of the target stratum and adopting a plurality of groups of mechanical key parameters according to different stratums, and the related drilling process technology is optimized for specific problems, so that the well wall of the hole is kept stable in the drilling process, and the subsequent construction operation is not influenced.
Description
Technical field [0001] The invention relates to the technical field of petroleum pipelines, in particular to a method for analyzing the stability of a directional penetrating hole. Background technique [0002] Horizontal directional drilling crossing technology, as a branch of the trenchless construction technology for oil and gas pipelines, is developed on the basis of oilfield directional drilling technology, and is formed by combining traditional pipeline laying technology with oilfield directional drilling technology. The process principle is: during construction, according to the designed drilling trajectory, the drilling tool is driven by the drill and the drill rod is first to construct an approximately horizontal pilot hole. After the pilot hole drilling tool is unearthed on the other side of the obstacle, remove the pilot Use drill bits and instrument units to select appropriate drilling tools for reverse reaming according to the diameter of the pipeline and the geologi...
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IPC IPC(8): G06F30/23G06F119/14G06F113/14
Inventor 李国辉周晓东左雷斌马晓成杨春玲李金玲赵云鹤杨威刘其民孙翔王亚琼
Owner BC P INC CHINA NAT PETROLEUM CORP