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Flexible leak-stopping agent, and preparation method and application thereof

A plugging agent and flexible technology, applied in the field of plugging agent and its preparation, can solve the problems of easy breakage, long construction time, easy plugging failure, etc., achieve good fluidity and stability, high interface bonding strength, improve The effect of the construction period

Active Publication Date: 2017-04-19
盘锦鸿鼎油气技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The inner diameter of the repaired casing changes, which greatly restricts the continued oil production;
[0005] 2. The plugging agent used in the prior art has poor thixotropy and cannot effectively stay in the plugging layer. The plugging agent is replaced to the target layer and is lost before solidification, thus causing a large amount of plugging slurry injection , The problem of long construction time;
[0006] 3. The solidified body formed by the plugging agent has high brittleness, low pressure resistance and is easy to break. At the same time, it is easy to shrink and cannot form a firm cross-sectional bond with the surrounding medium. Shortening cannot be guaranteed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1: Preparation of flexible plugging agent raw materials

[0070] 1. Preparation of structure forming agent

[0071] example 1)

[0072] Take 100g of acrylic acid, add it to a three-necked flask, add 200g of water, stir, add 40g of magnesium oxide, and react at 50°C for 2 hours to obtain a transparent viscous liquid;

[0073] Take 150g of the synthesized polymer, add 0.1g ammonium persulfate (catalyst), add 0.03g N, N dimethylacrylamide (coupling agent), and prepare a homogeneous liquid to obtain a structure forming agent named J-1, Store at low temperature.

[0074] Example (2)

[0075] Take 100g of acrylic acid, add it to a three-necked flask, add 200g of water, stir, add 56g of calcium oxide, and react at 50°C for 2 hours to obtain a transparent viscous liquid;

[0076] Get 150g of synthesized polymer, add 0.3g of ammonium persulfate (catalyst), add 0.05g of N, N dimethylacrylamide (coupling agent), and prepare a homogeneous liquid to obtain a structure...

Embodiment 2

[0087] Embodiment 2: the preparation of flexible plugging agent

[0088] example 1)

[0089] Take 40g of the structure-forming agent J-1 prepared in Example 1, add 55g of water, stir evenly, then add 30g of active nano-reinforcing agent, stir evenly, then add 70g of active nanomaterials, stir evenly, and then add gelling solidification 2g of agent, 3g of organic macromolecular polymer, 0.5g of temperature regulating agent, and stir evenly to prepare a flexible plugging agent with a total weight of 200g.

[0090] Example (2)

[0091] Take 40g of the structure-forming agent J-2 prepared in Example 1, add 55g of water, stir evenly, then add 30g of active nano-reinforcing agent, stir evenly, then add 70g of active nanomaterials, stir evenly, and then add gelling solidification 2g of agent, 3g of organic macromolecular polymer, 0.5g of temperature regulating agent, and stir evenly to prepare a flexible plugging agent with a total weight of 200g.

Embodiment 3

[0092] Embodiment 3: the application of flexible plugging agent

[0093] construction technology

[0094] Use expandable packers, pull-out packers and other supporting tools to perform full-hole leak detection on oil wells to determine the exact location of casing damage and the exact location of the perforation section.

[0095] (1) According to the specific conditions of the construction well, formulate the slurry mix plan to adapt to the construction wells with different oil well water flooding, water channeling, bottom water coning, leakage degree, different well temperature and different leakage characteristics.

[0096] (2) According to the difficulty and depth of construction, select the construction methods such as full-hole horizontal pushing of the empty wellbore, plugging of the lower string and plugging of the lower packer string.

[0097] (3) Dynamically adjust various construction parameters during on-site construction.

[0098] Construction Performance Researc...

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PUM

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Abstract

The invention relates to a flexible leak-stopping agent and a preparation method thereof. The flexible leak-stopping agent comprises a structure forming agent, an active nanometer reinforcing agent, an active nano-material, a cementing curing cross-linking agent, an organic high-molecular polymer and a temperature conditioning agent, wherein the structure forming agent comprises, by mass, 20 to 60% of unsaturated organic acid, 20 to 60% of an alkaline earth oxide, 0.05 to 0.1% of a catalyst and 0.01 to 0.2% of a coupling agent, and the active nanometer reinforcing agent comprises, by mass, 30 to 60% of formaldehyde or acetaldehyde, 20 to 40% of urea and 0.5 to 1% of a stabilizing agent. Flexible chemical leak stopping for damage of a sleeve pipe of an oil-water well and selective water plugging for an oil well via the flexible leak-stopping agent are carried out in oil fields in China for the first time and have good application prospects.

Description

technical field [0001] The invention relates to the technical field of a plugging agent in an oil production process and its preparation method and application, in particular to a flexible plugging agent, its preparation method and its application in repairing casing damage. Background technique [0002] With the long-term water injection development of oil and gas fields, some old wells gradually appear water flooding and water channeling, resulting in a decrease in water flooding efficiency, seriously affecting the normal production of oil and water wells, and reducing the development level and economic benefits of the oil field. [0003] In the prior art, there are many problems in the commonly used plugging technology. Taking the most commonly used casing subsidy technology as the plugging technology of inorganic cementitious materials (such as cement and soil plugging technology) and thermosetting resin plugging technology (such as urea-formaldehyde resin plugging techn...

Claims

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Application Information

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IPC IPC(8): C09K8/512C08F120/06C08F2/44E21B33/138E21B33/13
CPCC08F2/44C08F120/06C09K8/512C09K8/882C09K8/887C09K2208/10E21B33/13E21B33/138
Inventor 郭子龙郭玉山郑书东李牧李燕衣保钢
Owner 盘锦鸿鼎油气技术服务有限公司
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