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
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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 to quickly dissolve bridge plugs and waiting too long for bridge plugs to dissolve and affecting construction progress, the present invention provides an electrochemical method for accelerating the dissolution of soluble bridge plugs. The present invention uses electrochemical (primary battery and electrolytic Pool) method, using the potential difference of various metals, by giving a certain current on the casing, quickly dissolving soluble balls and soluble bridge plugs, and restoring the wellbore diameter in time, no matter for rapid production or rapid fracturing Construction has very important practical significance

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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Embodiment 1

[0027] In order to overcome the existing problem that the bridge plug cannot be quickly dissolved, and the waiting time for the bridge plug to dissolve is too long, which affects the construction progress, the present invention provides such figure 1 and 2 An electrochemical method for accelerating the dissolution of soluble bridge plugs is shown. The present invention uses the electrochemical (primary battery and electrolytic cell) method to use the potential difference of various metals to quickly dissolve by giving a certain current on the casing. Soluble balls and soluble bridge plugs can restore wellbore diameter in time, which is of great practical significance for rapid production or rapid fracturing construction 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 protected against corrosion,

[0029] First with...

Embodiment 2

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

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

[0043] In the described step 1, the gas-generating and heat-generating agent B is sodium nitrite, and its mass concentration is 45%-55%; the injection volume of the gas-generating and heat-generating agent B is 3-5m 3 .

[0044] The saturated strong electrolyte in described step 1 and step 2 is potassium chloride, sodium chloride or calcium chloride, and saturated potassium chloride mass concentration is 34.2% at room temperature, and saturated sodium chloride mass concentration is 36.0%, satu...

Embodiment 3

[0066] Based on Examples 1 and 2, in this example, after staged multi-cluster volumetric fracturing with soluble bridge plugs in Well Hua H-X, it needs to be put into production quickly. After 3 days of shutting down, the bridge plugs are still not dissolved.

[0067] at 2m 3 / min displacement injection 5m 3 15% sulfuric acid, then connect 5m 3 Guar gum base fluid is used for isolation, and water is used to replace it to the position of the bridge plug. After about 1.5 hours, the bridge plug dissolves, and fluid comes out from the wellhead, leading to normal drainage and production.

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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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