Electrochemical method for accelerating dissolution of soluble bridge plug

An electrochemical and bridge plug technology, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., can solve the problems affecting the oil extraction time and construction progress, so as to speed up the dissolution rate and improve the operation efficiency , The effect of simple construction process

Active Publication Date: 2020-02-28
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual construction process of the oil field, it was found that after the fracturing was completed, when it was necessary to put into production quickly, it was found that some bridge plugs were still undissolved and still needed drilling and grinding, which affected the time to get oil on site
In special circumstances such as sand blockage, when it is necessary to speed up the dissolution of the bridge plug, there is often no way to do anything but wait for the bridge plug to dissolve itself, usually 2-3 days, which affects the construction progress
[0003] In order to overcome the existing problem of not being able

Method used

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  • Electrochemical method for accelerating dissolution of soluble bridge plug
  • Electrochemical method for accelerating dissolution of soluble bridge plug
  • Electrochemical method for accelerating dissolution of soluble bridge plug

Examples

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Example Embodiment

[0026] Example 1:

[0027] In order to overcome the problem that the existing bridge plugs cannot be quickly dissolved and the waiting time for the bridge plugs to dissolve is too long, which affects the construction progress, the present invention provides: figure 1 with 2 Shown is an electrochemical method for accelerating the dissolution of soluble bridge plugs. The present invention uses electrochemical methods (galvanic cells and electrolytic cells), using the potential difference of various metals, and quickly dissolving by setting a certain current on the sleeve The soluble ball and soluble bridge plug can restore the diameter of the wellbore in time, which is of great practical significance for the rapid commissioning or rapid fracturing of the next stage.

[0028] An electrochemical method for accelerating the dissolution of soluble bridge plugs. The specific steps are: Step 1. For the case where the inner wall of the casing has been internally anti-corrosive,

[0029] First...

Example Embodiment

[0040] Example 2:

[0041] Based on Example 1, in this example, in the step one, the gas and heat generating agent A is composed of ammonium chloride and citric acid with a mass ratio of 15: (1-5). The mass concentration of thermal agent A is 25-35%, and the injection volume of gas and thermal agent A is 3-5m 3 .

[0042] In the step one, the injection volume of guar gum base liquid is 2-4m 3 .

[0043] In the first step, the gas and heat generating agent B is sodium nitrite with a mass concentration of 45%-55%; the injection volume of the gas and heat generating agent B is 3-5m 3 .

[0044] The saturated strong electrolyte in step one and step two is potassium chloride, sodium chloride or calcium chloride, the mass concentration of saturated potassium chloride at room temperature is 34.2%, the mass concentration of saturated sodium chloride is 36.0%, and the mass concentration of saturated sodium chloride is 36.0%. The calcium concentration is 83.6%; the injection volume of saturate...

Example Embodiment

[0065] Example 3:

[0066] On the basis of Examples 1 and 2, in this example, the Hua H-X Well has to perform the soluble bridge plug segmented multi-cluster volume fracturing operation and needs to be quickly put into production. The bridge plug has not dissolved after 3 days of shutting in.

[0067] Take 2m 3 / min displacement injection 5m 3 15% sulfuric acid, then 5m 3 Guar gum base fluid was used for isolation and replaced with clean water to the position of the bridge plug. After about 1.5 hours, the bridge plug was dissolved and liquid was discharged from the wellhead, and the liquid was discharged normally.

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Abstract

The invention provides an electrochemical method for accelerating dissolution of a soluble bridge plug. The electrochemical method comprises the specific steps that 1, as for the situation that the inner wall of a casing is subjected to internal corrosion prevention, 5-8 m<3> of hydrochloric acid or sulfuric acid with the mass percent being 10-15% is injected at the displacement of 1-2 m<3>/min firstly, then 5-8 m<3> of guanidine gum base liquid is introduced for isolation, and replacing is conducted with clear water to the bridge plug position; as for the situation that the inner wall of thecasing is not subjected to internal corrosion prevention, a saturated strong electrolyte solution is injected at the displacement of 1-2 m<3>/min firstly, then a gas and heat production agent A, guanidine gum base liquid and a gas and heat production agent B are pumped sequentially, and replacing is conducted with clear water to the bridge plug position. Through the method of electrochemistry (a primary battery and an electrolytic cell), the potential difference of various metals is utilized, by giving a certain current to the casing, a soluble ball and the soluble bridge plug are rapidly dissolved, the diameter of a wellbore is recovered in time, and the electrochemical method is of great practical significance for rapid production or rapid fracturing construction of the next section.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to an electrochemical method for accelerating the dissolution of a soluble bridge plug. Background technique [0002] In recent years, hydraulic pumping rapid drilling bridge plug volume fracturing technology has been widely used in the development of shale gas and tight oil in North America, and it is the main stimulation technology for horizontal wells in tight reservoirs abroad. This process has the characteristics of high operating efficiency, large displacement injection for volume fracturing, and multi-cluster perforation. As an emerging horizontal well stimulation technology, it has been widely used in the development of foreign shale gas reservoirs and tight gas reservoirs in recent years. . In order to reduce the drilling and grinding time of bridge plugs and save the cost of grinding and milling, some companies have developed fracturing bridge plugs made of soluble m...

Claims

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Application Information

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IPC IPC(8): E21B33/134C25F1/04
CPCE21B33/134C25F1/04
Inventor 郭钢慕立俊李楷吴江刘锦周晓群范华波杜现飞鲜晟
Owner PETROCHINA CO LTD
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