High-density saline stimulation cross-linking type plugging agent, preparation method and application thereof

A high-density, cross-linked technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of high cost of formate, and achieve the effects of good operability, simple preparation and less residue.

Pending Publication Date: 2021-04-30
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the plugging agent system based on formate has the advantages of wide density range and good reservoir protection effect, the cost of formate, especially cesium formate, is very high

Method used

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  • High-density saline stimulation cross-linking type plugging agent, preparation method and application thereof
  • High-density saline stimulation cross-linking type plugging agent, preparation method and application thereof
  • High-density saline stimulation cross-linking type plugging agent, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] High-density salt water stimulates cross-linking plugging agent as temporary plugging agent, and its composition is as follows according to mass percentage: potassium pyrophosphate 47wt%, xanthan gum+κ-carrageenan 5wt-8wt%, the rest is clear water, and the experimental temperature is 120°C , see Table 2 for gelation.

[0045] Table 2 The gelling situation of the plugging agent prepared in Example 1

[0046]

[0047] As shown in Table 2, the gelling time of the plugging agent is 2 hours, the final setting strength is G~H, and no syneresis occurs in 12 days.

[0048] like figure 1 As shown, from the elastic modulus and viscous modulus values ​​of each sample after cooling to room temperature after aging for 3 days with different gelling agent content, it can be seen that temporary plugging agent systems with different strengths can be constructed by adjusting the content of gelling agent .

Embodiment 2

[0050] High-density salt water stimulates the cross-linking plugging agent as the perforation protection fluid, and its composition is as follows in terms of mass percentage: potassium pyrophosphate 47wt%, xanthan gum + κ-carrageenan at a concentration of 2wt% to 4wt%, and the rest is clear water. The temperature is 120°C, and the gelation conditions are shown in Table 3.

[0051] Table 3 The gelling situation of the plugging agent prepared in Example 2

[0052]

[0053] As shown in Table 3, the gelling time of the plugging agent is 4-8 hours, the final setting strength is D-E, and no syneresis occurs in 7 days, so it can be used as perforation protection fluid with different strengths.

[0054] figure 2 What is shown is that 3 parts of the plugging agent system with a gelling agent content of 3wt% were placed at the experimental temperature of 120°C, and the samples were taken out at the initial stage, after aging for 4 hours and after aging for 70 hours, and after each ...

Embodiment 3

[0056] High-density salt water stimulates the cross-linked plugging agent as a temporary plugging agent, and its composition is as follows in terms of mass percentage: potassium pyrophosphate 47wt%, xanthan gum + κ-carrageenan at a concentration of 5wt% to 8wt%, the rest is water, and the experimental temperature The temperature is 90°C, see Table 4 for gel formation.

[0057] Table 4 The gelling situation of the plugging agent prepared in Example 3

[0058]

[0059] As shown in Table 4, the gelling time of the plugging agent is 2 hours, the final setting strength is G~H, and no syneresis occurs in 7 days. It can be used as a temporary plugging agent or water blocking agent with different strengths.

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Abstract

The invention discloses a high-density saline stimulation cross-linking type plugging agent, a preparation method and application thereof. The plugging agent is composed of the following components in percentage by mass: 21-53% of a main agent, 0.5-9% of a gelatinizing agent and the balance of clear water, wherein the main agent is one or more of dipotassium hydrogen phosphate, potassium phosphate and potassium pyrophosphate, and the gelatinizing agent is one or more of xanthan gum and kappa-carrageenan. According to the invention, the gelling time of the high-density saline stimulation cross-linking type plugging agent at 90-160 DEG C is 0.5-12 hours (controllable), and the final setting strength can reach D-H (controllable); and the high-density saline stimulation cross-linking type plugging agent is a gel system, is convenient to prepare on site and high in operability, and can be widely applied to temporary plugging and leakage prevention, perforation reservoir protection, water plugging and profile control and other construction operations of high-temperature, high-pressure and multi-pressure strata oil and gas wells.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry in the exploitation of oil and natural gas, and is widely used in construction operations such as temporary plugging and leakage prevention of oil and gas wells in high temperature, high pressure, and multi-pressure layers, perforation reservoir protection, water plugging and profile control, etc. A high-density saline-stimulated cross-linking plugging agent and its preparation method and application. Background technique [0002] Today's oil and gas reservoir development targets are gradually shifting to deep and ultra-deep layers. During the development process, the well depth increases, and the geological conditions are complex and changeable, often accompanied by many challenging problems, such as high temperature, high pressure, reservoir pressure reversal, "upper spray and lower leakage" and other issues. For wells with abnormally high pressure reservoirs, the contradiction betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/514
Inventor 贾虎戴尚坤赵金洲卢志崇
Owner SOUTHWEST PETROLEUM UNIV
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