Plugging Method and Control System for Drilling Reservoir Fractures

Abstract

A plugging method and control system for drilling reservoir fractures. The method includes: (1). Collecting geology, drilling, drilling fluid and leakage parameters to calculate the width of reservoir fractures; (2). The width is selected to correspond to the particle size of the plugging material; (3). The pore size formed by the plugging material in step (2) is obtained through calculation, and the next-level plugging material with a particle size corresponding to the pore size is selected, and the next-level plugging material is sealed. Plug the pore size formed by the first level of plugging material; according to the above, calculate the pore size of each level of plugging material step by step, and select the corresponding particle size plugging material to form multi-level small particle size plugging The material is a plugging drilling fluid formula that plugs the pores of large particle size plugging materials to plug reservoir fractures. The control system includes a reservoir fracture width calculation module of an interactive user interface, a plugging drilling fluid formula generation module, a data record storage module and a display formula design module. It is convenient, practical and timely.

Description

technical field [0001] The invention relates to a plugging method for drilling reservoir fractures and a plugging control system, which is used to assist drilling fluid engineers to calculate the width of reservoir fractures and design the formula of plugging drilling fluid, and can be operated in real time at the drilling site, with high timeliness powerful. Background technique [0002] Natural fractures in reservoirs are important seepage channels for oil and gas production. When drilling encounters fractures, leakage often occurs, which requires drilling fluid for plugging. At present, the plugging method used in oil and gas production is to roughly estimate the fracture width according to the leakage rate and design the plugging fluid formula based on experience. This method has the following three main shortcomings: 1. The crack width is estimated, and the engineer does not know the exact parameters, which makes it difficult to design the subsequent plugging scheme. T...

AI Technical Summary

Problems solved by technology

This method has the following three main shortcomings: 1. The crack width is estimated, and the engineer does not know the exact parameters, which makes it difficult to design the subsequent plugging scheme. This is because the accurate prediction of the crack width is the key to the subsequent plugging plan 2. The exact particle size distribution of the materials in the plugging drilling fluid cannot be known from the empirically determined plugging drilling fluid formula, because a reasonable particle size distribution is the key to successful plugging, which often requires multiple Plugging can be successful; 3. From the estimation of the fracture width to the design of the plugging drilling fluid formula, it depends entirely on the subjective experience of the engineer, which is poor in practicability

The main shortcomings of the above three points make it impossible to determine the plugging operation at one time, and it often needs to be repeated many times in the form of experiments to succeed, which seriously restricts the smooth development of oil and gas wells

Moreover, this experimental repeated plugging requires a large amount of plugging drilling fluid, which increases the cost of oil and gas production. What is more serious is that a large amount of plugging drilling fluid and plugging slurry invade into the deep part of the reservoir, making it difficult to flow back and causing losses. Oil and gas seepage channels, causing irreparable damage to the reservoir

Images