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Segmented water plugging method of liquid bridge plug of horizontal well

A technology for liquid bridges and horizontal wells, which is applied in the field of segmental water plugging of horizontal well liquid bridge plugs and segmental water plugging of horizontal wells to enhance oil recovery. It can solve the problems of lack of plugging agent products and injection techniques, and reduce construction costs risk, meet the use environment, and achieve the effect of oil layer protection

Inactive Publication Date: 2011-09-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, the current horizontal well water plugging technology lacks effective plugging agent products and injection techniques

Method used

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  • Segmented water plugging method of liquid bridge plug of horizontal well
  • Segmented water plugging method of liquid bridge plug of horizontal well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method for segmented water plugging of horizontal well liquid bridge plugs in this embodiment includes steps:

[0026] ① Lower the construction pipe string to the toe position of the horizontal well (see figure 1 ), open the casing gate, replace about 8.2 tons of liquid bridge plug, and then replace 6m 3 Clear water. The liquid bridge plug consists of 650Kg of acrylamide monomer, 1.6Kg of ammonium persulfate initiator, 80Kg of polyacrylamide (molecular weight 12 million), 100Kg of sodium chloride, and 7390Kg of water. The liquid bridge plug system is prepared according to the following method: slowly add the weighed polyacrylamide and acrylamide monomer into water under stirring, and continue to stir for 40 minutes; add ammonium persulfate and stir for 10 minutes; finally add chloride Sodium regulates density.

[0027] ② Lift the construction pipe string to the water outlet section (2020m), and replace clean water by 1.2m 3 , waiting for 24h;

[0028] The above...

Embodiment 2

[0033] The method for segmented water plugging of horizontal well liquid bridge plugs in this embodiment includes steps:

[0034] 1. Lower the construction string to the toe position of the horizontal well (2110m), open the casing gate, and replace about 5.2 tons of liquid bridge plug, followed by 6m replacement 3 Clear water; the liquid bridge plug consists of 460Kg of acrylamide monomer, 1.0Kg of initiator ammonium persulfate, 60Kg of polyacrylamide (molecular weight: 22 million), 100Kg of sodium chloride, and 4580Kg of water. The liquid bridge plug system is prepared according to the following method: slowly add the weighed polyacrylamide and acrylamide monomer into the water under stirring, and continue to stir for 30 minutes; add ammonium persulfate and stir for 5 minutes; finally add sodium chloride Adjust the density.

[0035] 2. After filling the liquid bridge plug, lift the construction pipe string above the suspension point (1700m), close the casing gate, and wait f...

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Abstract

The invention provides a segmented water plugging method of a liquid bridge plug of a horizontal well. The method comprises the following steps of: lowering an oil tube at a tiptoe position of the horizontal well, injecting a prepared liquid bridge plug solution into the horizontal well by a positive alternate method, and filling a horizontal section of a well shaft; lifting the oil tube, setting a port position of the oil tube at a water outlet part of an oil well, and carrying out water displacement on the liquid bridge plug to make part of well sections filled with water, wherein the part of well sections is a water plugging target well section; waiting on cement to make the liquid bridge plug become gel, filling the well sections, except the water plugging target well section, of the horizontal section of the well shaft, and finishing temporary plugging protection process; injecting a plugging agent by using the conventional tubular column to make the target well section effectively plugged, and not injecting the plugging agent into the protected well sections; injecting a small amount of steam or breaker by using the conventional tubular column to make the gel of the liquid bridge plug thoroughly broken and become a low-viscosity water solution; and lifting out a construction tubular column to finish the whole water-plugging construction process. By the invention, temporary plugging at any position in the horizontal well can be realized, and the aim of segmented water plugging is fulfilled.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a method for segmented water shutoff of a horizontal well liquid bridge plug, which is a process for using polymers for segmental water shutoff of horizontal wells to enhance oil recovery. Background technique [0002] Most of the horizontal wells are located in heavy oil reservoirs, and the oil-water mobility ratio is very high. A slight increase in the water saturation of some oil drainage channels will induce a large increase in water cut. Once the water breaks through, the crude oil production rate will drop sharply, and the water Processing fees increase. Without proper remediation, it is bound to close prematurely. Appropriate use of plugging regulation technology to suppress excessive water production of horizontal wells is an effective means to solve the problems faced. [0003] At present, more than 80% of horizontal well water plugging adopts polymer + genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B33/134
Inventor 李瑞龙华马昌明潘建华张守军郎宝山高本成刘恩宏朱富林白云渡王志兼
Owner PETROCHINA CO LTD
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