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Method for blocking leakage along abandoned well in geological storage process of carbon dioxide

A carbon dioxide and geological sequestration technology, which is applied in sealing/isolation, earthwork drilling, wellbore/well components, etc., can solve problems such as carbon dioxide leakage and leakage, achieve good results, reduce risks, and extremely low risk of geological environmental pollution Effect

Active Publication Date: 2021-10-12
CENT FOR HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CGS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem in the prior art that carbon dioxide stored underground leaks from abandoned drilling wells, and provides a plugging method for leakage along abandoned wells in the process of geological storage of carbon dioxide

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  • Method for blocking leakage along abandoned well in geological storage process of carbon dioxide
  • Method for blocking leakage along abandoned well in geological storage process of carbon dioxide

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Embodiment Construction

[0081] Combine below figure 1 The present invention is described in detail with examples. figure 1 It shows the facilities for sealing abandoned drilling wells, the set sealing structure and equipment according to the sealing method provided by the present invention. Blocking method by figure 2 show.

[0082] Specific steps include:

[0083] Step 1: Leak identification;

[0084] Step 2: cleaning in the well;

[0085] Step 3: perforating;

[0086] Step 4: plugging;

[0087] Step 5: Monitoring of plugging effect;

[0088] Step 6: Seal the well.

[0089] The following are detailed descriptions one by one.

[0090] First of all, carry out the leakage identification step for abandoned drilling wells, find out the location and amount of leakage of carbon dioxide along the abandoned wells, you can first set up a simple support at the wellhead, and support the gas flow meter 16 on the wellhead to measure whether there is carbon dioxide leakage at the wellhead. out. If carb...

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Abstract

The invention provides a method for blocking leakage along an abandoned well in the geological storage process of carbon dioxide. The method comprises the following steps that perforating is carried out by adopting a stable cover layer above a geological storage layer of carbon dioxide; a shaft with leakage risk, drilling annular cement and a surrounding rock fracture zone communicate with one another; and lime milk turbid liquid is injected into a perforation interval, so that lime milk in a gap reacts with leaked carbon dioxide to form hardened and compact calcium carbonate, and a carbon dioxide leakage channel is blocked. According to the method for blocking leakage along the abandoned well in the geological storage process of carbon dioxide, the crack channel leaking along the abandoned well in the geological storage process of carbon dioxide can be effectively blocked, meanwhile, a surrounding rock broken zone and crack-containing drilling well annulus cement can be cemented into a compact whole, and the risk of leaking along the abandoned well in the geological storage process of carbon dioxide is greatly reduced. The injected lime milk turbid liquid reacts with carbon dioxide leaked along the abandoned well to generate common calcium carbonate and water in the stratum, the geological environment pollution risk is extremely low, and the plugging process is safe and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of geological sequestration of greenhouse gases, and relates to a sealing method for leakage along an abandoned well during the geological sequestration of carbon dioxide. Background technique [0002] Carbon dioxide geological storage is a carbon dioxide emission reduction technology that injects and permanently stores carbon dioxide in geological bodies such as underground aquifers or abandoned oil and gas reservoirs. As an emerging carbon dioxide disposal technology with large-scale application potential, it provides a possibility for the near-zero emission of carbon dioxide used by fossil energy. [0003] The Chinese government attaches great importance to and actively responds to climate change, and has put forward the grand goal of "strive to reach the peak of carbon dioxide emissions before 2030, and strive to achieve carbon neutrality before 2060". To achieve the goal of carbon neutrality, carbon capture and ...

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Application Information

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IPC IPC(8): E21B33/13E21B33/138
CPCE21B33/13E21B33/138
Inventor 付雷马鑫刁玉杰张成龙刘廷付杰邵炜
Owner CENT FOR HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CGS
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