Petroleum drilling plugging and pressure-bearing agent and method of preparing same

Abstract

A petroleum drilling plugging and pressure-bearing agent and a method of preparing same. The plugging and pressure-bearing agent includes: bentonite, elastic particles, oil-soluble resin, asbestos powder, filler, an accelerator and a reinforcing curing agent. The plugging and pressure-bearing agent can effectively plug a gap being smaller than 3 mm; at a high temperature of 150 DEG C, pressure bearing capacity reaches 9 MPa, so that the product satisfies the demand of long-time high-temperature high-pressure-bearing situation. The product can be used for plugging micro-gaps in high temperaturemud rocks at the deep place of an extra deep well and collapse in fractured formations. The product achieves the plugging and anti-collapse effect through the chemical functions, has great pressure-bearing capacity, greatly prolongs the period of collapse, and guarantees safety of deep well drilling.

Description

technical field [0001] The invention relates to the field of oil drilling, in particular to a leakage plugging and pressure bearing agent for oil drilling and a preparation method thereof. Background technique [0002] In the process of oil and natural gas exploration and development, lost circulation is a common phenomenon, especially in limestone formations, piedmont structural belts, fractured and fractured formations caused by in-situ stress concentration, and lost circulation is inevitable during drilling , and often to a very serious degree. According to statistical data, the incidence of lost circulation in the world can account for about 20-25% of the total number of wells, and the treatment of lost circulation, especially complex lost circulation, is a difficult technical problem in oil drilling operations. The practice of plugging shows that it is very difficult to deal with the loss of drilling fluid in fractures, cave formations and large-pore high-permeability ...

AI Technical Summary

Problems solved by technology

[0004] At present, the application rate of chemical slurry plugging technology is increasing, but in terms of the overall application effect, several chemical slurry plugging technologies including special cement cannot effectively plug the open hole section, especially after plugging The pressure bearing capacity cannot reach the expected level, and the probability of repeated leakage after re-drilling is high, so more effective technical methods must be found