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Temporary plugging agent and preparation method and application thereof

A technology of temporary plugging agent and clay stabilizer, applied in the field of temporary plugging agent and its preparation, can solve the problems of poor oil solubility, low recovery rate, large formation damage, etc., and achieve strong adhesion performance, good plugging effect and state stable effect

Inactive Publication Date: 2019-04-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temporary plugging agent for diversion fracturing developed by domestic and foreign counterparts in the early stage is generally suitable for reservoirs with high temperature, but it is not suitable for medium and low temperature reservoirs. The reason is that the temporary plugging agent suitable for high temperature reservoirs is used for low temperature reservoirs. After the existing cracks are plugged, it is difficult to dissolve and remove the plugs, so the recovery rate is extremely low
Moreover, most of the existing temporary plugging agents use acrylamide, polyacrylamide and other materials, which have poor oil solubility and cause great damage to the formation.

Method used

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  • Temporary plugging agent and preparation method and application thereof
  • Temporary plugging agent and preparation method and application thereof
  • Temporary plugging agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The temporary plugging agent in this example is suitable for reservoirs with a temperature of 50°C, and includes the following components in terms of weight percentage:

[0062] 1. Inorganic salt (NaCl): 34%;

[0063] 2. Terpene resin T-80: 53%;

[0064] 3. Stearic acid (octadecanoic acid): 12%;

[0065] 4. Clay stabilizer (003-A) 1%;

[0066] The sum of the weight percentages of each component is 100%.

[0067] This temporary blocking agent can be prepared according to the following preparation method:

[0068] 1) Under stirring, add the above-mentioned raw materials in the reaction kettle according to the above-mentioned ratio to produce a mixture;

[0069] 2) Heat the mixture to 110°C (measured with a 30-200°C thermometer), and react under stirring for 1-2h, then stop the reaction;

[0070] 3) Using SE series screw extrusion granulator, the reactant wet material obtained in 2) is transported to the screw extrusion granulator at a temperature of 5-10°C higher tha...

Embodiment 2

[0083] The temporary plugging agent in this example is suitable for reservoirs with a temperature of 60°C, and includes the following components in terms of weight percentage:

[0084] 1. Inorganic salt (NaCl): 34%;

[0085] 2. Terpene resin (T-80): 57%;

[0086] 3. Stearic acid (octadecanoic acid): 8%;

[0087] 4. Clay stabilizer (003-A) 1%;

[0088] The sum of the weight percentages of each component is 100%.

[0089] This temporary blocking agent can be prepared according to the following preparation method:

[0090] 1) Under stirring, add the above-mentioned raw materials in the reaction kettle according to the above-mentioned ratio to produce a mixture;

[0091] 2) Heat the mixture to 115°C (measured with a 30-200°C thermometer), react under stirring for 1-2h, and then stop the reaction;

[0092] 3) Using SE series screw extrusion granulator, the reactant wet material obtained in 2) is transported to the screw extrusion granulator at a temperature of 5-10°C higher th...

Embodiment 3

[0105] The temporary plugging agent in this example is suitable for reservoirs with a temperature of 70°C, and includes the following components in terms of weight percentage:

[0106] 1. Inorganic salt (NaCl): 34%;

[0107] 2. Terpene resin T-100: 57%;

[0108] 3. Stearic acid (octadecanoic acid): 8%;

[0109] 4. Clay stabilizer (003-A) 1%

[0110] The sum of the weight percentages of each component is 100%.

[0111] This temporary blocking agent can be prepared according to the following preparation method:

[0112] 1) Under stirring, add the above-mentioned raw materials in the reaction kettle according to the above-mentioned ratio to produce a mixture;

[0113] 2) Heat the mixture to 120°C (measured with a 30-200°C thermometer), react under stirring for 1-2h, and then stop the reaction;

[0114] 3) Using SE series screw extrusion granulator, the reactant wet material obtained in 2) is transported to the screw extrusion granulator at a temperature of 5-10°C higher than...

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Abstract

The invention provides a temporary plugging agent and a preparation method and application thereof. The temporary plugging agent is prepared from the following components in percentage by weight: 34%of inorganic salt, 52-65% of terpene resin, 0-13% of stearic acid and 1% of a clay stabilizer. The temporary plugging agent is suitable for medium and low temperature reservoirs, the plugging effect is good, the permeability and recovery rate are high, the solubleness is good, and the temporary plugging agent has low damage to formation, and is a steering and repetitive fracturing temporary plugging agent with a good effect.

Description

technical field [0001] The invention relates to a temporary plugging agent and its preparation method and application, and belongs to the technical field of chemicals used in the petroleum industry. Background technique [0002] Hydraulic fracturing has been widely and successfully applied worldwide as a stimulation measure for low-permeability oil and gas reservoir stimulation. The crude oil has been recovered to a high degree, but the large amount of remaining oil outside the oil drainage area has a low degree of recovery. Therefore, conventional refracturing may not necessarily have a considerable oil production effect simply by extending the original fractures. [0003] Turning to refracturing technology is a new technology developed in the 1990s. It overcomes that conventional refracturing can only reopen old fractures to partially restore the conductivity of old fractures. Artificial temporary plugging diversion refracturing technology is to add temporary plugging ag...

Claims

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Application Information

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IPC IPC(8): C09K8/508C09K8/88E21B33/13
CPCC09K8/5083C09K8/882E21B33/13
Inventor 刘建伟张佩玉舒福昌刘海廷邓强廖天彬袁玉梅刘剑辉何海波陈文彬
Owner PETROCHINA CO LTD
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