Temporary plugging agent for fractured reservoir acidification, and preparation method thereof

A temporary plugging agent and reservoir technology, which is applied in the field of temporary plugging agent for acidification of fractured reservoirs and its preparation field, can solve problems such as weakening effect, and achieve the effects of improving effectiveness, restoring permeability, and improving the effect of acidification.

Active Publication Date: 2020-06-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the acidification process, the concentration of the acid solution will gradually decrease as the use time increases, and the effect will be weakened. Therefore, it is necessary to develop a temporary plugging agent that can effectively improve the effect of the acid solution, which can not only play a plugging role , and can improve the acidification effect

Method used

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  • Temporary plugging agent for fractured reservoir acidification, and preparation method thereof
  • Temporary plugging agent for fractured reservoir acidification, and preparation method thereof
  • Temporary plugging agent for fractured reservoir acidification, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Such as figure 1 with figure 2 A temporary plugging agent for fractured reservoir acidification is shown, which is composed of the following raw materials in weight percentage: 70-90% of the main agent, 2-5% of the catalyst, 3-10% of the binder, and 3-10% of the dispersant And coating agent 2-5%.

[0041] In actual use, the present invention reacts and synthesizes the temporary plugging agent for acidification of fractured reservoirs under the vacuum protection condition of a high-temperature stirred tank and a twin-screw extruder in the art. The temporary plugging agent of the present invention generates acid liquid with viscosity by changing the reaction between the acid liquid and the temporary plugging agent, reduces the reaction rate of the acid rock, improves the corrosion ability of the acid liquid to the fractured formation, and has the effect of temporary plugging and diversion diversion, and improves acidification. Effect.

Embodiment 2

[0043] A temporary plugging agent for fractured reservoir acidification, the difference from Example 1 is: the main agent is composed of tannin, sulfonated tannin and sodium benzoate; the tannin, sulfonated tannin and benzene Sodium formate accounts for 30-40%, 40-50% and 10-20% of the total weight of the main agent respectively.

[0044] In actual use, compared with the commonly used earth acid solution, after adding the temporary plugging agent, the concentration of residual acid after the acid solution reacts with the core is delayed from 0.1% to 3.12%. After adding the temporary plugging agent, the reaction rate between the acid fluid and the core decreased significantly, as shown in image 3 shown.

Embodiment 3

[0046] A temporary plugging agent for acidification of fractured reservoirs, the difference from Example 1 is that the catalyst is composed of dimethylaniline and methylaniline; wherein dimethylaniline and methylaniline are respectively The percentages of the total weight of the catalyst are 30-60% and 40-70%.

[0047] In actual use, compared with the commonly used soil acid solution, after adding the temporary plugging agent, the acid solution and core dissolution rate increased by 28%. Figure 4 shown.

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Abstract

The invention belongs to the technical field of oil and gas field production increase and transformation, and particularly relates to a temporary plugging agent for fractured reservoir acidification,and a preparation method thereof. The temporary plugging agent is prepared from, by weight, 70-90% of a main agent, 2-5% of a catalyst, 3-10% of an adhesive, 3-10% of a dispersing agent and 2-5% of afilm coating agent. The preparation method comprises the following five steps: preparing materials, mixing the raw materials, vacuumizing, preparing solid particles, coating and drying, and the temporary plugging agent is prepared through reacting and synthesizing by using a high-temperature stirring kettle and a double-screw extruder under the vacuumizing protection condition. A viscous acid liquid is generated by changing the reaction of the acid liquid and the temporary plugging agent, so that the acid rock reaction rate is reduced, the corrosion capacity of the acid liquid to a fracturedstratum is improved, and meanwhile, the temporary plugging diversion effect and the acidification effect are improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field stimulation and transformation, and in particular relates to a temporary plugging agent for acidification of fractured reservoirs and a preparation method thereof. Background technique [0002] Fractured oil and gas reservoirs have high degree of fracture development, high storage space, poor interconnection with each other, and low single well productivity, which is a type of oil and gas reservoir that is difficult to explore and develop. Acid fracturing is a key technology for the effective development and production of fractured oil and gas reservoirs at this stage. [0003] During the acidizing process, the main factor limiting the extension of acid-etched fractures and hindering the extension of acid-etched fractures is the large amount of acid fluid loss. On the one hand, due to the chemical reaction between the acid and the surface of the fracture, a filter cake barrier cannot be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/506C09K8/516C09K8/74
CPCC09K8/516C09K8/506C09K8/74
Inventor 金娜蒋文学李勇汪小宇徐洋吴增智郑维师武龙武月荣王所良王坤荆建春徐方向赵晨君文果孟庆聪范杰
Owner BC P INC CHINA NAT PETROLEUM CORP
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