Method for predicting high steep structure stratum leakage velocity before drilling

A technology of structure and rate, applied in the field of pre-drilling prediction of loss rate of high and steep structural formations, can solve problems such as the development of structural fractures, differences in formation physical parameters, complex geological conditions, etc., and achieve the effect of preventing malignant loss

CN103015996BActive Publication Date: 2014-03-19CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2014-03-19

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Abstract

The invention relates to a method for predicting the high steep structure stratum leakage velocity before drilling, which belongs to the field of oil-gas field development. The method specifically comprises the following steps: analyzing the geologic structure characteristics; simulating a finite element of a paleo ground stress; acquiring paleostructure fracture distribution; acquiring fracture parameters under a paleostructure stress; simulating a finite element of a modern ground stress; determining fracture parameters under the modern ground stress condition; determining the fracture parameters under the combined action of the paleo and modern stresses; and predicting the leakage velocity before drilling. By utilizing the method, the drilling liquid leakage velocity can be predicted in a drilling well at a high steep complex structure stratum before drilling, so that the method has a certain guidance function in preventing pernicious leakage in the high steep structure stratum and is helpful to the selection of the size of a lost circulation material.
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Description

technical field

[0001] The invention belongs to the field of oil and gas field development, and in particular relates to a method for predicting the leakage rate of high and steep structural strata before drilling. Background technique

[0002] my country has a large amount of oil and gas resources contained in areas with high and steep structures. For example, the Northeast Sichuan region has huge oil and gas reserves, but high and steep structures account for more than 80% of the geological structures in this area. The high and steep structures have complex geological conditions, structural fractures are developed, and the leakage phenomenon is serious during drilling, which not only causes huge economic losses, but also brings great harm to drilling safety. If it is possible to predict the leakage at different well depths in high and steep structural formations before drilling, especially the prediction of the leakage rate, then in the actual drilling construction process...

Examples

Embodiment Construction

[0036] like figure 1 As shown, the method for predicting the loss rate of high and steep structural strata before drilling includes the following steps:

[0037] (1) Analysis of geological structure characteristics

[0038] Starting from the regional structure where the block is located, research and analyze the regional structural location, structural evolution history, and structural characteristics of the basin to obtain the geological structure characteristics of the block, and combine the analysis results of structural evolution to obtain the structural fractures in the target area The formation of the main tectonic period obtains the shape of the geological structure of the target area before and after the main tectonic period; among them, the geological structure characteristics of the block include the structure type, stratum composition, lithology, trend and the depth structure map of each group of strata in the block.

[0039] (2) Finite element simulation of paleog...