Method for quickly removing resistance and blockage of soluble bridge plug

A technology for jamming and bridge plugging, which is applied in the field of rapid release of soluble bridge plugs for blocking and jamming. It can solve the problems of difficult removal of stuck drills, high processing costs of coiled tubing, and high labor intensity, and achieve the goal of reducing labor intensity of workers. Effect

Active Publication Date: 2020-04-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for quickly releasing soluble bridge plugs and jams, including the following steps:

[0034] 1) Inject clean water at the wellhead first, then inject the accelerated dissolving liquid slug, and finally inject clean water. After the accelerated dissolving liquid slug reaches the position where the soluble bridge plug encounters resistance and jams, stop the pump and shut in the well. The shut-in time is 1-2 hours , The injection displacement of the accelerated dissolving liquid slug is 1.0-2.0m 3 / min, the volume of the accelerated dissolving liquid slug is 1-2m 3 ;

[0035] 2) Inject clean water at the wellhead, replace the accelerated dissolving liquid slug of step 1) over the soluble bridge plug and stop the pump after the block encounters the jam position. The shut-in time is 0.5-1.0 hours, and the injection displacement of the clean water is 1.0-2.0m 3 / min;

[0036] 3) Repeat step 1) to step 2) for a total of 3-5 times, so that the dissolving solution at the pos...

Embodiment 2

[0055] A method for quickly releasing soluble bridge plugs and jams, including the following steps:

[0056] 1) Inject clean water at the wellhead first, then inject the accelerated dissolving liquid slug, and finally inject clean water. After the accelerated dissolving liquid slug reaches the position where the soluble bridge plug encounters resistance and jams, the pump is stopped and the well is shut in for 2 hours. The injection displacement of the accelerated dissolving liquid slug is 2.0m 3 / min, the volume of the accelerated dissolving liquid slug is 2m 3 ; The accelerated dissolving solution is a KCl solution with a concentration of 1%.

[0057] 2) Inject clean water at the wellhead, replace the accelerated dissolving liquid slug of step 1) over the soluble bridge plug and stop the pump after the block encounters the stuck position. The shut-in time is 1.0 hour, and the injection displacement of the clean water is 2.0m 3 / min;

[0058] 3) Repeat step 1) to step 2) for a total...

Embodiment 3

[0069] A method for quickly releasing soluble bridge plugs and jams, including the following steps:

[0070] 1) Inject clean water at the wellhead first, then inject the accelerated dissolving fluid slug, and finally inject clean water. After the accelerated dissolving fluid slug reaches the position where the soluble bridge plug encounters resistance and jams, the pump will be stopped and the well will be shut in for 1.5 hours. The injection displacement of the accelerated dissolving liquid slug is 1.5m 3 / min, the volume of the accelerated dissolving liquid slug is 1.5m 3 ; The accelerated dissolving solution is a KCl solution with a concentration of 3%.

[0071] 2) Inject clean water at the wellhead, replace the accelerated dissolving liquid slug of step 1) over the soluble bridge plug, and then stop the pump and shut in the well. The shut-in time is 7.5 hours, and the injection displacement of the clean water is 1.5m 3 / min;

[0072] 3) Repeat step 1) to step 2) 4 times, so that ...

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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...

Claims

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Application Information

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IPC IPC(8): E21B29/00E21B43/26C22C23/02C22C23/04C22C30/06
CPCE21B29/00E21B43/26C22C23/02C22C23/04C22C30/06
Inventor 白晓虎李晓燕邓咸安余兴国向奎陈强杜现飞李川殷桂琴黄蓬刚
Owner PETROCHINA CO LTD
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