Water-absorbing profile adjusting sleeve pipe and adjusting method for water injection well

A water absorption profile and adjustment method technology, which is applied to chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve the problems of short effective period of measures, low efficiency of measures, and lack of pertinence, so as to reduce the pipe string Corrosion, the effect of solving uneven water flooding

Active Publication Date: 2019-12-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a casing for adjusting the water absorption profile of a water injection well and an adjustment method to solve the problems in the prior art that the effective period of the measures is short, the effective efficiency of the measures is low, there is no pertinence, and the construction process is complicated

Method used

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  • Water-absorbing profile adjusting sleeve pipe and adjusting method for water injection well

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] like figure 1 As shown, a casing for adjusting the water absorption profile of a water injection well includes a first oil pipe 1, a plug 8 is connected to the lower end of the first oil pipe 1, and casing packers 3, The first water distributor 4, the interlayer packer 5, the intubation seal 6 and the second water distributor 7, the first oil pipe 1 is connected with the first water distributor 4, the first oil pipe 1 is also provided with the second oil pipe 2, the second The second oil pipe 2 is connected to the second water distributor 7 .

[0024] The first tubing 1 is connected to the wellhead, the end of the first tubing 1 is connected with a plug, and the casing packer 3, the first water distributor 4, and the interlayer packer are sequentially sleeved outside the first tubing 1 from top to bottom 5. The intubation seal 6 and the second water distributor 7. The second oil pipe 2 is also connected to the wellhead and placed in the first oil pipe 1. The first oil ...

Embodiment 2

[0030] A method for adjusting the water absorption profile of a water injection well,

[0031] In the first step, the casing is run in, and the casing for adjusting the water absorption profile of the water injection well is run into the water injection well;

[0032] The second step is to adjust the water absorption profile. For the two water injection layers, one layer has weak water absorption due to formation blockage, and the other layer has strong water absorption. Through one of the water distributors, the strong water absorption layer is treated with diversion acidification technology. Plugging, through another water distributor to acidify and increase the injection of the weak water absorption layer, the acid liquid system in the split acidification technology adopts chelating acid, polyhydric acid or authigenic acid liquid system, and passes through the strong water absorption layer and the weak water absorption layer Separated by multiple packers;

[0033] Adjust t...

Embodiment 3

[0041] When using the split acidification technology to block the strong water-absorbing layer, if the oil well corresponding to the water injection well in the strong water-absorbing layer has high water content and the oil well is flooded quickly, the diversion agent in the split-flow acidizing technology uses an oil-soluble plugging agent to seal the strong water-absorbing layer. Permanent plugging prevents water from entering the strong water-absorbing layer; the oil-soluble blocking agent is insoluble in acid and insoluble in water.

[0042] If the water injection well in the strong water-absorbing layer corresponds to low water content in the oil well, and the oil-water well has good connectivity, the water-soluble plugging agent used in the diversion agent in the diversion acidification technology can temporarily block the strong water-absorbing layer. After the construction is completed and the water is injected again, the plugging agent It will automatically dissolve i...

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Abstract

The invention discloses a water-absorbing profile adjusting sleeve pipe and adjusting method for a water injection well, which comprise the sleeve pipe and different adjusting methods for a water-absorbing profile. According to reservoir physical properties, water-absorbing profile characteristics and oil-water communication conditions of oil reservoir, wells with non-uniformly distributed water-absorbing profiles can be treated in a targeted manner, so that the degree of water drive use, the water drive sweeping area and the oil field recovery ratio can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of oil field injection water development, and in particular relates to a casing for adjusting the water absorption profile of a water injection well and an adjustment method. Background technique [0002] Water injection is an effective means to replenish formation energy and ensure long-term stable production of oilfields. However, in the process of water injection development, tight reservoirs in oilfield reservoirs have small porosity, low permeability, and strong reservoir heterogeneity, resulting in water breakthrough and water absorption being affected by micro-fractures. Influenced by water penetration and uneven water absorption, some wells have gradually deteriorated water absorption patterns, the proportion of wells with uneven water absorption has increased year by year, development contradictions have gradually been exposed, and water flooded wells have increased year by year. [0003] Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B43/27C09K8/46
CPCE21B43/20E21B43/26C09K8/46
Inventor 邓志颖张随望陆小兵王勇宋昭杰王尔珍胡改星
Owner PETROCHINA CO LTD
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