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A hydraulic deblocking acidification process

A plug-removing and hydraulic technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve the problems of high water injection pressure, formation blockage, affecting water injection volume and crude oil production, etc., to expand the seepage area, improve Seepage conditions and effects of improving seepage patterns

Active Publication Date: 2018-10-02
DAQING XINZHIHE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of crude oil extraction, the formation near the well is polluted and clogged, and the water injection pressure is high. Some water injection layers cannot meet the injection requirements, which affects the water injection volume and crude oil production. In actual work, the formation with low permeability Conventional acidizing and plugging removal in the block has no effect, and the implementation of fracturing acidizing and plugging removal process is complicated and costly, and it is easy to cause organic plugging in the formation

Method used

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  • A hydraulic deblocking acidification process
  • A hydraulic deblocking acidification process
  • A hydraulic deblocking acidification process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Remove the wellhead and install the wellhead controller without overflow. (2) Lifting the original well string, pulling out 116 pieces of Φ62mm anti-corrosion tubing, Y341-114YF*0.4 / 0.6 packer level 2, bridge type*1m eccentric water distributor 2 pieces, 50.8 / 47*0.3 ball seat 1 piece, Inspection: the tubing of the original well was seriously waxed. (3) Measuring tubing assembly with hydraulic unblocking and acidizing string. (4) One piece of Φ62mm wire plug under the acidizing pipe string for hydraulic unplugging, Y344-114 packer level 5, 2 sandblasting devices with sliding sleeve, 1 modified sandblasting device, 1 hydraulic anchor of Φ114mm, Φ110mm One safety joint, 114 Φ62mm thickened oil pipes, and a completed depth of 1101.05m. (5) Magnetic positioning, cooperate with the test team to measure magnetic positioning, and the tool depth is qualified. (5) High-pressure hydraulic deblocking acidification preparation, on-site preparation of acid solution 44m 3 , pr...

Embodiment 2

[0031](1) Remove the wellhead and install the wellhead controller without overflow. (2) Pulling out the original well string: pulling out 117 Φ62mm anti-corrosion tubing, Y341-114XM packer level 2, 2 pieces of 665-2 eccentric water distributor, 1 Φ62mm dead plug, inspection: the original well tubing was pulled out intact. (3) Measuring tubing assembly with hydraulic unblocking and acidizing string. (4) Acidizing pipe string with hydraulic unplugging, 1 Φ62mm plug, 3rd grade Y344-114 packer, 1 sandblasting device with sliding sleeve, 1 modified sandblasting device, 1 Φ114mm hydraulic anchor, One Φ110mm safety joint, 113 Φ62mm thickened oil pipes, and a completed depth of 1085.38m. (4) Magnetic positioning, cooperate with the test team to measure magnetic positioning, and the tool depth is qualified. (5) High-pressure hydraulic deblocking acidification preparation, on-site preparation of acid solution 46m 3 , prepare 3 sets of acid tank trucks, 4 sets of water tank trucks, 17...

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Abstract

Hydraulic deblocking acidification process. The process includes the following steps: (1), removing the wellhead; (2), lifting the original well pipe string; (3), launching the hydraulic unplugging acidizing string; (4), magnetic positioning; (5), high-pressure hydraulic unplugging acidizing; (6), ground pressure test: ground pressure test 55Mpa, 10min no puncture and no leakage pressure test qualified; (7), hydraulic unblocking acidification layer 1; (8), ball slipping sleeve; (9), hydraulic unblocking acidification 2 (10), ball-throwing sliding sleeve; (11), 3 layers of hydraulic unplugging and acidification; (12), flowback after 12 hours of well shut-in reaction; (13), starting and unplugging acidizing string; (14), (15) Lower completion string: lower stratified water distribution tools, anti-corrosion tubing, coated with sealing grease; wellhead and finishing. This application fully uses physical methods to increase the effective penetration distance of acid liquid in the formation, and improves the permeability of the formation in a large range, so as to achieve the purpose of increasing production and injection.

Description

Technical field: [0001] The invention relates to the technical field of plugging removal for oil and water wells in oil fields, and belongs to a hydraulic plugging removal and acidification process. Background technique: [0002] In the process of crude oil extraction, the formation near the wellbore is polluted and blocked, and the water injection pressure is high. Some water injection layers cannot meet the injection requirements, which affects the water injection volume and crude oil production. In actual work, the formation with low permeability Conventional acidizing and plugging removal in the block has no effect, and the implementation of fracturing acidizing and plugging removal process is complicated and costly, and it is easy to cause organic plugging in the formation. Invention content: [0003] In order to overcome the deficiencies in the background technology, the present invention provides a hydraulic plugging acidification process. The application fully uses...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27
CPCE21B43/26
Inventor 王俭满春山贺国宇
Owner DAQING XINZHIHE TECH
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