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A New Killing Method for Well Workover

A technology for workover and well killing, which is applied in wellbore/well components, earthwork drilling, sealing/isolation, etc. Efficient and environmentally friendly development, inability to meet well killing needs, etc., to reduce on-site workover costs, improve long-term benefits, and reduce environmental protection costs

Active Publication Date: 2022-01-07
SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the killing fluids used at home and abroad are mainly clean brine, glue type, gel type, foam type, solid-phase temporary plugging agent type, etc., all have their own advantages and disadvantages, and some can effectively block but cannot flow back smoothly , or cause greater damage to oil and gas wells; some can flow back smoothly but have poor plugging ability, which cannot meet the well killing requirements; others are too expensive and pollute, which is not conducive to the efficient and environmentally friendly development of oilfields
These types of killing fluids and corresponding technologies are currently unable to properly solve the relationship between effective plugging and leakage prevention of oil and gas wells, smooth flowback of killing fluids, low damage and environmental friendliness, which is not conducive to the development of workover operations

Method used

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  • A New Killing Method for Well Workover

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a new type of well killing method for well workover, first use the pump truck to pump the salt-containing fracturing fluid 4 from the casing 3 into the wellbore 2, after the salt-containing fracturing fluid 4 is filled with the wellbore 2, then pass through the tubing Mix the killing fluid and fine silt into the downhole, wherein the mass ratio of the fine silt to the total mixing amount is 2%-15%; the killing fluid will gradually thicken downhole, forming a length of The liquid rubber plug 6 that can seal liquid and gas can realize the plugging of oil and gas spillage. Among them, the fine silt will promote the formation of plugging at the bottom hole; after the pressure stabilization test is qualified, the workover operation will be implemented Finally, a gel breaker is added for backwashing and production.

[0035] The salt-containing fracturing fluid is composed of 1.5%~8.0% cationic gemini surfactant, 2.0%~15% KCl and 77.0%~96.5% H 2 O ...

Embodiment 2

[0040] Such as figure 1 As shown, a novel workover method for killing wells, the specific implementation steps are as follows:

[0041] Step 1: Operation preparation before well killing;

[0042] Step 2: pump saline fracturing fluid from the casing, and let the saline fracturing fluid fill the entire wellbore;

[0043] Step 3: Open the casing valve, pump the killing fluid containing fine silt from the tubing, and let the killing fluid flow back from the bottom of the well to the predetermined position, so that it can form in the wellbore between the bottom of the well and the predetermined position. A liquid rubber plug for sealing liquid and gas; the predetermined position is 200m upwards from the bottom of oil layer 7, wherein the kill fluid containing fine silt is mixed with fine silt, and the amount of fine silt accounts for the total mixed The mass ratio of the amount is 2%-15%;

[0044] Step 4: Close the casing valve;

[0045] Step 5: With less than 1m 3 Inject saline...

Embodiment 3

[0057] It is basically the same as Example 2, except that the salt-containing fracturing fluid is composed of 1.5% cationic gemini surfactant, 2.0% KCl and 96.5% H 2 O is mixed according to the above mass ratio.

[0058] The well killing fluid is composed of 1.5% cationic gemini surfactant, 0.2% sodium sulfosalicylate and 98.3% H 2 O.

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Abstract

The invention relates to a novel well killing method and well killing fluid for well workover. Firstly, a pump truck is used to pump salt-containing fracturing fluid from the casing into the wellbore. Killing fluid and fine silt are mixed and injected downhole, and the mass ratio of fine silt to the total mixing amount is 2%-15%; the killing fluid will gradually thicken downhole, forming a length of Liquid rubber plugs that can seal liquids and gases, so as to block oil and gas spills. Among them, fine silt will promote the formation of plugs at the bottom holes; after passing the pressure stabilization test, implement workover operations, and finally add The breaker was backwashed and put into production. The method of the present invention applies the liquid rubber plug plugging technology to the well killing technology to form a plug that can not only effectively block and prevent oil and gas wells, but also can be flowed back smoothly, and is friendly to the environment and good for the formation. The damage is low.

Description

technical field [0001] The invention relates to a well killing method, in particular to a novel well killing method and well killing fluid suitable for downhole workover operations of oil and gas wells. Oil and gas field production and development technology field. Background technique [0002] With the continuous development of oilfield production and development, oil, gas, and water wells are in the process of self-spraying, pumping, or water injection, and gas injection. Due to various reasons such as equipment aging, corrosion, extrusion, and blockage, downhole equipment is damaged or malfunctions. As a result, the well cannot produce normally, and it is necessary to take corresponding workover operations to eliminate faults, replace downhole equipment and other measures to restore normal production. During the workover process, in order to avoid accidents such as oil and gas leakage or well kicks in the reservoir, well killing operations are required to ensure the smoo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13E21B33/138
CPCE21B33/13E21B33/138
Inventor 任雁鹏刘畅肖良飞
Owner SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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