Preparation and use method of downhole intelligent plug

Abstract

The invention discloses a preparation and use method of a downhole intelligent plug. The preparation method is as below: using acrylamide and sodium acrylate as raw materials, adding an initiator sodium sulphite to synthesize a jelly, preparing a base fluid, and crosslinking with a cross-linking agent to form a stable plug capable of automatically breaking at a set time. The downhole intelligent plug provided by the invention is in a liquid shape before gelatinization, and is pumped to a preset position of the wellhole by a ground pump; after gelatinization, the rubber plug can seal the wellhole and prevent up transportation of stratum oil gas, so as to ensure wellhole operation safety; meanwhile the rubber plug can avoid entering of killing fluid into the stratum to cause reservoir damage affecting well productivity, and the rubber plug can automatically degrade after operation, thereby ensuring smoothness of the wellhole.

Description

technical field

[0001] The invention relates to the preparation and use method of a downhole intelligent rubber plug, which belongs to the technical field of oil and gas well engineering. Background technique

[0002] Before oil and gas wells are operated, in order to balance the formation pressure, high-density killing fluid must be used to circulate and kill the wellbore in the wellbore to ensure that the oil and gas in the formation do not enter the wellbore and avoid accidents such as well kicks and blowouts. However, under well killing conditions, the well killing fluid easily enters the formation, causing sensitive damage to the reservoir, blocking oil and gas channels, and affecting oil well productivity. In order to change this situation, snubbing operations can be used instead of killing hydraulic wells, that is, wellbore pressure is controlled through wellhead equipment, which can not only ensure the safety of wellhead operations, but also avoid the damage caused b...

Images