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Injected gas acidification method

A technology for injecting gas and gas, which is used in the fields of fluid production, earth-moving drilling, wellbore/well components, etc. It can solve the problems of insufficient energy in low-pressure formations, incomplete flowback of residual acid, and low production of oil wells, so as to reduce the secondary The effect of damage, strong applicability, and high input-output ratio

Inactive Publication Date: 2020-04-24
陕西博石源丰能源科技有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Due to formation adsorption and capillary force, etc., residual acid flowback is not complete, causing secondary damage;
[0005] 2. Secondary damage caused by the acid slag produced by the contact between acid and crude oil during the acidification process;
[0006] 3. Insufficient energy in low-pressure formations and low oil well production

Method used

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Embodiment Construction

[0031] The method steps of the preferred embodiment of the present invention are as follows:

[0032] 1) Inject gas: connect the gas pressure equipment pipeline, and inject the gas into the formation through the gas pressure equipment;

[0033] The volume of injected gas, according to the site conditions, is calculated by the following formula:

[0034] P1*V1 / T1=P2*V2 / T2

[0035] Among them: P1 is the pressure of the ground injected gas, V1 is the volume of the ground injected gas, T1 is the temperature of the ground injected gas; P2 is the formation pressure, V2 is the underground volume, and T2 is the formation temperature.

[0036] The surface injected gas pressure P1, surface injected gas temperature T1, formation temperature T2 and formation pressure P2 are all measured on site, and the volume V1 of surface injected gas can be calculated by determining the underground volume V2 to be injected.

[0037] The gas includes but is not limited to air, nitrogen, carbon dioxide...

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Abstract

The invention relates to an injected gas acidification method which comprises the following steps of (1) injecting gas: connecting with a gas pressure equipment pipeline, and injecting the gas into aformation through gas pressure equipment; and (3) acidifying: acidifying the formation injected with the gas. The injected gas acidification method provided by the invention has the advantages of supplementing formation energy, relieving secondary damage, improving formation permeability, improving an oil well stimulation capacity, and improving an acidification effect.

Description

technical field [0001] The invention relates to the petroleum field, in particular to an acidification method for injecting gas. Background technique [0002] The acid treatment process of squeezing the formation under the pressure enough to open the formation to form fractures or open the original formation fractures is called fracturing acidification; it can be divided into pre-fluid acid fracturing and ordinary acid fracturing (or general acid fracturing). Fracturing and acidizing is mainly used to plug oil and gas wells in deep or low-permeability areas; fracturing and acidizing where the acid injection pressure is higher than the fracture pressure of oil (gas) layers is commonly called acid fracturing. [0003] The current conventional acidizing method is an acid treatment measure to remove the plugging of foreign matter such as drilling fluid and put it into normal production after the new well is completed or after the workover. The process is to squeeze the acid liq...

Claims

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Application Information

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IPC IPC(8): E21B43/27
CPCE21B43/26
Inventor 曾亚勤陈荣
Owner 陕西博石源丰能源科技有限公司
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