Hydraulic plug removal acidizing technology

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

Active Publication Date: 2016-10-12
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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  • Hydraulic plug removal acidizing technology
  • Hydraulic plug removal acidizing technology
  • Hydraulic plug removal acidizing technology

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 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 outer thickened oil pipes of Φ62mm, 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 , pre...

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 for 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, 170...

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Abstract

The invention provides a hydraulic plug removal acidizing technology. The technology includes the following steps that firstly, a wellhead is detached; secondly, an original well pipe column is lifted out; thirdly, a hydraulic plug removal acidizing pipe column is put down; fourthly, magnetic positioning is conducted; fifthly, high-pressure hydraulic plug removal acidification is conducted; sixthly, a ground pressure test is conducted, wherein the ground pressure test is exerted at 55 Mpa for 10 min, and the test is passed if no puncture or leakage exists; seventhly, a first layer is subjected to hydraulic plug removal acidification; eighthly, steel balls are thrown to hit a sliding sleeve; ninthly, a second layer is subjected to hydraulic plug removal acidification; tenthly, the steel balls are thrown to hit the sliding sleeve; eleventhly, a third layer is subjected to hydraulic plug removal acidification; twelfthly, a well is closed, a reaction is conducted for 12 hours, and then liquid is reversely drained; thirteenthly, the plug removal acidizing pipe column is lifted up; fourteenthly, puncturing washing and measuring are conducted; and fifteenthly, a completion pipe string is put down, wherein a layered water distribution tool and an anti-corrosion oil pipe are put down, and sealing grease is painted; and the wellhead is mounted, and the technology is ended. By the adoption of the technology, a physical method is fully used for increasing the effective penetrating distance of acid liquid in a stratum, the stratum seeping performance is improved within a relatively large range, and therefore the purposes of yield increase and injection increase are achieved.

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 Applications(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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