Method for quickly removing resistance and blockage of soluble bridge plug

Abstract

The invention belongs to the technical field of oil field oil extraction, and particularly provides a method for quickly removing resistance and blockage of a soluble bridge plug. The method comprisesthe following steps: sequentially injecting clear water, an accelerated dissolving solution slug and clear water into a wellhead, and stopping a pump and closing a well after the slug reaches a blockage position; injecting clear water and stopping the pump and closing the well after the slug is displaced to pass through the resistance position; injecting a sand-carrying fluid slug into the wellhead to polish the wall of the shaft sleeve so that a bridge plug rubber sleeve and dissolved residues on the wall of the sleeve are peeled off; and feeding soluble balls so that residues dispersed andretained in the wellbore are pushed to a toe fractured well section. The problems that the existing ignition release soluble bridge plug cannot be completely dissolved in a low-temperature stratum, thebridge plug rubber sleeve and residues are still located on the wall of the sleeve, normal pumping of a follow-up bridge shooting tool is affected, labor intensity is high, cost is high and risks arelarge can be solved. The soluble bridge plug is rapidly removed, the wellbore is smoothly cleaned and subsequent operation is smooth only through operation at the to-be-pressed wellhead without opening the wellhead or putting down grinding and milling tubular columns.

Description

Technical field [0001] The invention belongs to the technical field of oil production in oil fields, and specifically relates to a method for quickly releasing a soluble bridge plug and jamming. Background technique [0002] For the fracturing of horizontal wells in tight reservoirs, the main body currently adopts the bare-casing fracturing process of soluble bridge plugs + multi-cluster perforation. The technology is generally mature. Taking the Ordos Basin as an example, the annual promotion and application has reached more than 100 There are more than 2,000 horizontal wells. Affected by unfavorable factors such as horizontal wellbore trajectory fluctuations, wellbore patency and bridge plug pumping pressure changes, during the pumping process of soluble bridge plugs, there will be early blockages and jams, resulting in failure of soluble bridge plugs. Moved up and down and forced to suspend construction. At present, it is usually used to ignite the soluble bridge plug, and t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the method for quickly releasing the soluble bridge plug when it is blocked and stuck provided by the present invention is to overcome the conventional oil pipe + milling drilling tool in the prior art: first, the oil pipe needs to be re-erected, which is labor-intensive and time-consuming. The processing time is more than 20 days; the second is that during the milling process, the liquid entering the ground in the completed section will return to the formation when the wellhead is opened, which is not conducive to the safety and environmental protection and the stable production of the oil well; the second purpose is to overcome the problems in the existing technology For coiled tubing + milling drilling tools: First, for horizontal wells with relatively large vertical wells, coiled tubing will self-lock; second, the processing cost of coiled tubing is high, and the single cost is 300,000 to 500,000 yuan; third, coiled tubing drilling It is difficult to remove the stuck drill during grinding, which causes a great risk of downhole accidents.