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A method for adjusting the water absorption profile of a water injection well

A technology of water absorption profile and adjustment method, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. Corrosion, the effect of solving uneven water flooding

Active Publication Date: 2022-01-04
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 method for adjusting the water absorption profile of a water injection well 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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  • A method for adjusting the water absorption profile of a water injection well

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Comparison scheme
Effect test

Embodiment 1

[0023] Such as 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 o...

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] In the step of plugging the strong water-absorbing layer using diversion acidification technology, if the oil well corresponding to the water injection well of the strong water-absorption layer already has high water content, the oil well will be flooded soon, and the diversion agent in the diversion acidification technology adopts an oil-soluble plugging agent, which is not suitable for the strong water-absorbing layer. The water-absorbing layer is permanently blocked to prevent water from entering the strong water-absorbing layer; the oil-soluble blocking agent is insoluble in acid and insoluble in water.

[0042] If the oil well corresponding to the water injection well in the strong water-absorbing layer has medium-low water cut, and the oil-water well has good connectivity, the diversion agent in the diversion acidification technology uses a water-soluble plugging agent to temporarily block the strong water-absorbing layer. The agent automatically dissolves in water...

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Abstract

The invention discloses a method for adjusting the water absorption profile of a water injection well, which includes different adjustment methods for the casing and the water absorption profile. According to the physical properties of the reservoir, the characteristics of the water absorption profile and the oil-water connection status, the wells with uneven distribution of the water absorption profile are targeted. Treatment can effectively improve the degree of water drive utilization, water drive affected area and oilfield recovery factor.

Description

technical field [0001] The invention belongs to the technical field of oil field injection water development, and in particular relates to a method for adjusting a water absorption profile of a water injection well. 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, there is an urgent need to...

Claims

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Application Information

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Patent Type & Authority Patents(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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