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Method for three-layer unblocking for immovable string

A technology for removing blockage and moving pipes, which is applied in earth-moving drilling, cleaning equipment, and production of fluids, etc., can solve problems such as production decline and oil pressure sudden drop, and achieve the effects of cost saving, solving large area and simple construction.

Inactive Publication Date: 2018-12-11
JEREH ENERGY SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is designed to solve the problems of oil pressure sudden drop and production drop caused by sand settling and crystal scaling inside the oil pipe, the inside of the oil pipe shoe casing, the screen pipe and the formation near the wellbore.

Method used

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  • Method for three-layer unblocking for immovable string
  • Method for three-layer unblocking for immovable string
  • Method for three-layer unblocking for immovable string

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for three-layer plugging removal without moving the string. The three-layer plugging removal includes plugging removal in the tubing, plugging removal in the tubing casing, and plugging removal near the wellbore; specifically, coiled tubing well control equipment is installed at the entrance of the high-pressure gas well. , A circulating working fluid desanding system is set up on the ground, and downhole tools and plugging liquid are transported through coiled tubing to realize three-layer plugging removal.

[0034]Downhole tools include special tool strings, venturi overshots, screw drilling tools, small diameter sand pumps or any combination of special nozzles.

[0035] The operation steps of unblocking in the tubing are as follows: downhole tools are installed at the bottom of the coiled tubing, and the 1050-type pump truck on the ground circulates the sand washing fluid to provide power for the downhole drilling tools. The three-stage sand removal and filt...

Embodiment 2

[0046] A method for three-layer plugging removal without moving the string. The three-layer plugging removal includes plugging removal in the tubing, plugging removal in the tubing casing, and plugging removal near the wellbore; specifically, coiled tubing well control equipment is installed at the entrance of the high-pressure gas well. , A circulating working fluid desanding system is set up on the ground, and downhole tools and plugging liquid are transported through coiled tubing to realize three-layer plugging removal.

[0047] Further, the downhole tools include special tool strings, Venturi overshots, screw drill tools, small diameter sand pumps or any combination of special nozzles.

[0048] The operation steps of unblocking in the tubing are as follows: downhole tools are installed at the bottom of the coiled tubing, and the 1200-type pump truck on the ground circulates the sand flushing fluid to provide power for the downhole drilling tools. The three-stage sand remo...

Embodiment 3

[0059] A method for three-layer plugging removal without moving the string. The three-layer plugging removal includes plugging removal in the tubing, plugging removal in the tubing casing, and plugging removal near the wellbore; specifically, coiled tubing well control equipment is installed at the entrance of the high-pressure gas well. , A circulating working fluid desanding system is set up on the ground, and downhole tools and plugging liquid are transported through coiled tubing to realize three-layer plugging removal.

[0060] Further, the downhole tools include special tool strings, Venturi overshots, screw drill tools, small diameter sand pumps or any combination of special nozzles.

[0061] The operation steps of unblocking in the tubing are as follows: downhole tools are installed at the bottom of the coiled tubing, and the 1050-type pump truck on the ground circulates the sand washing fluid to provide power for the downhole drilling tools. The three-stage sand remov...

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Abstract

The invention relates to the technical field of unblocking of oilfield gas wells, in particular to a method for three-layer unblocking for an immovable string. The three-layer unblocking includes oiltube internal unblocking, through-tubing casing internal unblocking and unblocking of immediate vicinity of a wellbore. The method comprises the following specific steps: arranging coiled tubing wellcontrol equipment at the position of an inlet of a high-pressure gas well; arranging a circulating working liquid sand removal system on the ground; and carrying downhole tools and delivering unblocking liquid by coiled tubing to realize three-layer unblocking. The method is proposed for a blocked gas well of an oilfield, the coiled tubing is used as a carrier of unblocking tools, and used as a deliverer for unlocking liquid. The method is simple to construct, the cost is saved, well control is safe, reservoir protection is implemented, occupied area is small, the method runs safely and reliably, and the requirements for unblocking operation of a high-pressure gas well of an oilfield can be met completely.

Description

technical field [0001] The invention relates to the technical field of plugging removal for gas wells in oil fields, in particular to a three-layer plugging removal method for a non-moving pipe string. Background technique [0002] In the development of high-pressure, high-temperature deep gas wells, with the deepening of oilfield block mining, the original high-yield wells have clogged production strings, sand at the bottom of the well, blocked screens, and near-wellbore due to sand production in the formation and scaling in the wellbore. If the belt flow path is not smooth, resulting in a sudden drop in oil pressure and a significant reduction in output (such as figure 1 shown). In order to solve these problems, the current traditional method is to use a large-scale deep well drilling rig and conventional downhole tools to pull out the original well pipe string, flush sand, remove the blockage near the wellbore, re-repair the hole, and run the pipe string again for oil te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00E21B37/06E21B43/26
CPCE21B21/00E21B37/06E21B43/26
Inventor 张健叶登胜王龙谢丛剑苏贵杰王恒李雪原
Owner JEREH ENERGY SERVICES
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