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Fiber temporary plugging agent for acidizing and fracturing

A technology of acid fracturing and temporary plugging agent, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of formation damage, complicated construction, difficult to disperse, etc., achieve small damage, good plugging effect, and improve intensity effect

Active Publication Date: 2014-04-02
CHENGDU LEARN PRACTICES TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, such particles are lipophilic, not easy to disperse in the drilling fluid, float on the surface of the drilling fluid, and are easy to coalesce after being softened at high temperature and returned to the ground to cool down, resulting in complicated construction
In addition, in recent years, the research and application of film-forming drilling fluid technology have also been carried out in China. However, these film-forming agents are generally water-soluble and non-oil-soluble substances. Pores, while able to contact most plugs through perforation and flowback, can also cause some damage to formations

Method used

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  • Fiber temporary plugging agent for acidizing and fracturing
  • Fiber temporary plugging agent for acidizing and fracturing

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: A fiber temporary plugging agent for acidification fracturing, which consists of the following parts by weight of the carrier fluid and temporary plugging fibers: 90 parts by weight of the carrier fluid, 0.8 parts by weight of the temporary plugging fiber; the carrier fluid consists of the following parts by weight of raw materials : Guar gum 0.2, fungicide 0.1, viscosity stabilizer 0.3, drainage aid 0.3, sodium carbonate 0.1;

[0020] The temporary plugging fiber is polyvinyl alcohol fiber and meets the following requirements:

[0021] A. Fiber length: 3mm accounts for 10%, 6mm accounts for 60%, 11mm accounts for 40%;

[0022] B. Fiber tensile strength: 20MPa;

[0023] C. Fiber diameter: 10μm;

[0024] D. Fiber dissolving properties: soluble in aqueous solution above 50°C, the dissolution time is greater than 30 minutes, and the dissolution rate is greater than 95%.

Embodiment 2

[0025] Embodiment 2: A fiber temporary plugging agent for acidification fracturing, which is composed of the following parts by weight of the carrier fluid and temporary plugging fibers: carrier fluid 95, temporary plugging fiber 2; the carrier fluid is composed of the following raw materials by weight : Guar gum 0.6, fungicide 0.5, viscosity stabilizer 0.7, drainage aid 0.8, sodium carbonate 0.5;

[0026] The temporary plugging fiber is modified polyester fiber and polyurethane fiber, the weight ratio is 3:1, and meets the following requirements:

[0027] A. Fiber length: 5mm accounts for 35%, 10mm accounts for 40%, 15mm accounts for 25%;

[0028] B. Fiber tensile strength: 800MPa;

[0029] C. Fiber diameter: 100μm;

[0030] D. Fiber dissolving performance: at a temperature above 50°C, it is soluble in 20% hydrochloric acid, the dissolution time is more than 30 minutes, and the dissolution rate is more than 95%.

Embodiment 3

[0031] Embodiment 3: A fiber temporary plugging agent for acidification fracturing, which is composed of the following carrier fluid and temporary plugging fiber in parts by weight: carrier fluid 92, temporary plugging fiber 1; the carrier fluid is composed of the following raw materials in parts by weight : Guar gum 0.4, fungicide 0.3, viscosity stabilizer 0.4, drainage aid 0.4, sodium carbonate 0.3;

[0032] The temporary plugging fiber is polyvinyl alcohol fiber, modified polyester fiber and polyurethane fiber, the weight ratio is 1:2:1, and meets the following requirements:

[0033] A. Fiber length: 4mm accounts for 30%, 7mm accounts for 55%, 12mm accounts for 15%;

[0034] B. Fiber tensile strength: 100MPa;

[0035] C. Fiber diameter: 30μm;

[0036] D. Fiber dissolving properties: soluble in aqueous solution above 50°C, the dissolution time is greater than 30 minutes, and the dissolution rate is greater than 95%.

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Abstract

The invention discloses a fiber temporary plugging agent for acidizing and fracturing. The fiber temporary plugging agent is prepared from 90-95 parts by weight of transport fluid and 0.8-2 parts by weight of temporary plugging fiber, wherein the transport fluid is prepared from the following raw materials in parts by weight: 0.2-0.6 part of guanidine gum, 0.1-0.5 part of bactericide, 0.3-0.7 part of viscosity stabilizing agent, 0.3-0.8 part of cleanup additive and 0.1-0.5 part of sodium carbonate. A dissoluble temporary plugging fiber is added to the transport fluid under a certain condition. The dissoluble fiber can form a high-density space network structure, so that the structure has strong plugging capacity. Thus, the strength of a temporary plugging layer is greatly improved. The fiber temporary plugging agent for acidizing and fracturing disclosed by the invention has the advantages of being good in plugging effect, easy to be automatically broken down after being fractured and acidized, and small in damage to a storage layer, and the success rate of construction is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a fiber temporary plugging agent for acidizing fracturing. Background technique [0002] Temporary plugging fracturing and acidizing technologies use temporary plugging agents to form filter cakes in front of high-permeability layers or increase the flow resistance of high-permeability layers, so that the working fluid can divert into low-permeability layers. The usual practice is to prepare solid particles of different particle sizes into a stable suspension with a carrier liquid, and use it as a temporary plugging agent before pumping it into the formation before acidizing. According to the principle of minimum flow resistance, the previous The temporary plugging agent will preferentially enter the high-permeability layers or fractures with low flow resistance. With the continuous injection of the temporary plugging agent, due to the different particle si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508
CPCC09K8/5045C09K8/5083C09K8/5086C09K8/514C09K2208/08
Inventor 张绍彬康毅
Owner CHENGDU LEARN PRACTICES TECH CO LTD
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