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Horizontal well plug removal and yield increase integrated technology and system

A technology for horizontal wells and processes, applied in the direction of flushing boreholes, boreholes/well components, cleaning tools, etc., can solve the problems of low plugging removal efficiency, poor flushing effect, high cost, etc., to improve reservoir permeability, economical and applicable Strong performance and high work efficiency

Active Publication Date: 2021-06-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are three main cleaning and plugging removal technologies for coalbed methane horizontal wells: (1) varnish oil pipe positive circulation and large-displacement clean water flushing and plugging removal. This process is simple to operate and convenient to construct, but the plugging removal efficiency is relatively low; Cyclical rotary flushing, this process has a good effect on the plugging of the screen hole and the collapse of the outer wall of the screen, but the effect on the pollution and plugging of the reservoir near the wellbore is general, and it is not good for the wave-shaped horizontal well. The flushing effect of deposition plugging in the low-lying part of the wellbore is poor; (3) Nitrogen foam reverse circulation flushing to remove plugging. This process uses nitrogen foam as the well flushing fluid to flush the wellbore in reverse circulation. The plugging removal effect is good, but the cost is relatively high, and the plugging removal effect on the screen hole and near the wellbore is mediocre

Method used

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  • Horizontal well plug removal and yield increase integrated technology and system
  • Horizontal well plug removal and yield increase integrated technology and system
  • Horizontal well plug removal and yield increase integrated technology and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] The present embodiment 1 provides a kind of downhole swirling flow shock plugging removal and flushing tool, such as figure 1 As shown, the downhole swirling impact plugging removal and flushing tool 100 includes:

[0118] The self-rotating impact part 1 includes the impact part body 11. The first center hole 10 with one end open and one end closed is arranged on the impact part body 11 in the axial direction. The impact part body 11 is provided with a horn-shaped outlet communicating with the first center hole 10 The axial nozzle 1201 of the impact part body 11 is provided with a mechanical claw 13 capable of rotating and crushing solid phase particles; the well flushing fluid flows through the first central hole 10 and the axial nozzle 1201 to generate a high-speed jet, which is harmful to the inside of the horizontal wellbore and the screen pipe. High-speed impact unblocking at the hole / casing blast hole; the mechanical claw 13 can mechanically crush the solid phase ...

Embodiment 2

[0141] This embodiment provides an integrated system for removing plugging and increasing production of horizontal wells, such as figure 2 , Figure 4 and Figure 6 As shown, the system includes a first water storage tank 101, a second water storage tank 102, a liquid distribution tank 16, a pump truck 17, a nitrogen making truck 18, a booster truck 19, a sewage tank 09, a foam generator 27 and implementation The downhole swirling impact plugging removal and flushing tool 100 provided in Example 1;

[0142] One end of the tubing 01 of the horizontal well is connected to the female joint 32 of the swirl generation part 3 of the downhole swirl impact plugging removal and flushing tool 100, and in the initial state, the downhole swirl impact plugging removal flushing tool 100 Located near the landing point P01 of the horizontal well;

[0143] The second water storage tank 102 is connected to the inlet of the liquid distribution tank 16 through a pipeline, the outlet of the li...

Embodiment 3

[0149] This embodiment provides an integrated system for removing plugging and increasing production of horizontal wells, such as image 3 , Figure 5 and Figure 6 As shown, the system includes a first water storage tank 101, a second water storage tank 102, a liquid distribution tank 16, a pump truck 17, a sewage tank 09, and the downhole swirling impact plugging removal and well cleaning tool 100 provided in Embodiment 1. ;

[0150] One end of the tubing 01 of the horizontal well is connected to the female joint 32 of the swirl generation part 3 of the downhole swirl impact plugging removal and flushing tool 100, and in the initial state, the downhole swirl impact plugging removal flushing tool 100 Located near the landing point P01 of the horizontal well;

[0151] The second water storage tank 102 is connected to the inlet of the liquid distribution tank 16 through a pipeline, the outlet of the liquid distribution tank 16 is connected to the inlet of the pump truck 17 t...

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Abstract

The invention provides a horizontal well plug removal and yield increase integrated technology and system. The horizontal well plug removal and yield increase integrated technology comprises the steps that one end of an oil pipe is connected with an underground rotational flow impact plug removal well washing tool, and the underground rotational flow impact plug removal well washing tool is put into a horizontal well shaft; a plug removal well washing medium is injected into an oil sleeve annulus, the plug removal well washing medium generates rotating high-speed impact flow in a wellbore annulus after flowing through the rotational flow generating part, and reverse circulation rotational impact plug removal is carried out on the horizontal well shaft and a slotted screen pipe from the position near a horizontal well landing point; the plug removal well washing medium carries impacted pollution plugs to enter the oil pipe from a circulation switching part and is carried to a wellhead from the oil pipe; the plug removal well washing medium is injected into the oil pipe, and the circulation switching part is closed under the pressure difference effect of the plug removal well washing medium after the plug removal well washing medium flows through the tool; the plug removal well washing medium forms a trumpet-shaped high-speed impact jet flow in the axial direction of the horizontal well after flowing into the self-rotation impact part to impact and disturb blockages for positive circulation plug removal; and reverse circulation well washing and blocking removal are carried out again, so that blocking objects which are cut off and deposited in the shaft in the blocking removal process are circulated out of the shaft.

Description

technical field [0001] The present invention relates to an integrated technology and system for removing plugging and increasing production of horizontal wells, and in particular to a method of reverse circulation swirl flow flushing and plugging removal in wellbore of developed horizontal wells, positive circulation swirling plugging removal, swirling plugging removal and production increase in the near wellbore area, The integrated technology of high-frequency oscillating hydraulic wave and cavitation noise ultrasonic physical blockage removal and production increase belongs to the field of horizontal well mining technology. Background technique [0002] During the drilling and completion of horizontal wells, the solid particles in the drilling fluid, completion fluid, and fracturing fluid invade into the cleat fractures of the reservoir, causing certain pollution and damage to the reservoir near the wellbore; during the development of the horizontal well Solid particles s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/03E21B21/00E21B37/00E21B28/00
CPCE21B31/03E21B31/005E21B21/00E21B37/00E21B28/00
Inventor 张义李隽师俊峰曹光强王云李楠贾敏王浩宇刘岩杨晓鹏
Owner PETROCHINA CO LTD
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