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Fibre compound temporary plugging agent

A technology of fiber composite and temporary plugging agent, applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of formation damage, complicated construction, and difficult to disperse, and achieves less damage, good plugging effect, and improved strength. Effect

Active Publication Date: 2014-04-16
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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  • Fibre compound temporary plugging agent
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  • Fibre compound temporary plugging agent

Examples

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Embodiment 1

[0023] Embodiment 1: a kind of fiber composite temporary plugging agent, it is made up of the raw material of following parts by weight: carrying liquid 55, temporary plugging agent particle 20, temporary plugging fiber 0.5;

[0024] The carrier liquid is composed of the following raw materials in parts by weight: 0.2 guar gum, 0.1 bactericide, 0.3 viscosity stabilizer, 0.3 drainage aid, and 0.1 sodium carbonate;

[0025] The temporary plugging agent particles are sodium stearate, and meet the following requirements:

[0026] A. Particle size of temporary plugging agent: 20 mesh accounts for 30%, 60 mesh accounts for 60%, and 100 mesh accounts for 10%;

[0027] B. Dissolution properties of temporary plugging agent particles: soluble in aqueous solution above 50°C, the dissolution time is greater than 30 minutes, and the dissolution rate is greater than 95%;

[0028] The temporary plugging fiber is polyvinyl alcohol fiber and meets the following requirements:

[0029] C. Fibe...

Embodiment 2

[0033] Embodiment 2: a fiber composite temporary plugging agent, which is composed of the following raw materials in parts by weight: carrier liquid 75, temporary plugging agent particles 30, temporary plugging fiber 2;

[0034] The carrier liquid is composed of the following raw materials in parts by weight: 0.6 guar gum, 0.5 bactericide, 0.7 viscosity stabilizer, 0.8 drainage aid, and 0.5 sodium carbonate;

[0035] The temporary plugging agent particles are acrylic resin and polyvinyl alcohol, the weight ratio is 1:2, and meet the following requirements:

[0036] A. Particle size of temporary plugging agent: 160 mesh accounts for 65%, 100 mesh accounts for 30%, and 80 mesh accounts for 5%;

[0037] B. Dissolution properties of temporary plugging agent particles: at a temperature above 50°C, it is soluble in 5% hydrochloric acid, the dissolution time is greater than 30 minutes, and the dissolution rate is greater than 95%;

[0038] The temporary plugging fiber is modified po...

Embodiment 3

[0043] Embodiment 3: a kind of fiber composite temporary plugging agent, it is made up of the raw material of following weight part:

[0044] Carrying fluid 60, temporary plugging agent particles 24, temporary plugging fiber 0.8;

[0045] The carrier fluid is composed of the following raw materials in parts by weight: 0.4 guacamole, 0.3 bactericide, 0.5 viscosity stabilizer, 0.5 drainage aid, and 0.3 sodium carbonate;

[0046] The temporary plugging agent particles are sodium stearate, acrylic resin and calcium carbonate, the weight ratio is 1:2:1, and meet the following requirements:

[0047] A. Particle size of temporary plugging agent: 160 mesh 80%, 140 mesh 10%, 40 mesh 10%;

[0048] B. Dissolution properties of temporary plugging agent particles: soluble in aqueous solution above 50°C, the dissolution time is greater than 30 minutes, and the dissolution rate is greater than 95%;

[0049] The temporary plugging fiber is polyvinyl alcohol fiber, modified polyester fiber a...

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Abstract

The invention discloses a fibre compound temporary plugging agent which comprises the following raw materials in parts by weight: 55-75 parts of transport fluid, 20-30 parts of temporary plugging agent grains and 0.5-2 parts of temporary plugging fibre. The transport fluid comprises the following raw materials in parts by weight: 0.2-0.6 part of guar gum, 0.1-0.5 part of sterilizing agent, 0.3-0.7 part of adhesive agent, 0.3-0.8 part of discharging agent and 0.1-0.5 part of sodium carbonate. The fibre capable of dissolving under certain conditions is added to the soluble temporary plugging agent grains. The fibre and the temporary plugging agent grains are used according to a certain proportion. The soluble fibre can form a space network structure which firmly bounds the temporary plugging grains to form an organic integrity, thereby greatly improving the intensity of the temporary plugging layer. The fibre compound temporary plugging agent has the advantages that the plugging effect is good and the plugging is easily and automatically unfastened after fracture and acidification with little hurt for the plugging layer. The success efficiency for working is obviously enhanced.

Description

technical field [0001] The invention belongs to the technical field of oil field chemistry, and in particular relates to a fiber composite temporary plugging agent. 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 size distributio...

Claims

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Application Information

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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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