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

A high-density, cross-linked technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problem of high cost of formate, and achieve good operability, good economy, and good thermal stability. Effect

Inactive Publication Date: 2020-07-28
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 prepared based on formate has the advantages of wide density range and good storage and preservation 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 and preparation method and application thereof
  • High-density saline stimulation cross-linking type plugging agent and preparation method and application thereof
  • High-density saline stimulation cross-linking type plugging agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 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 90%, xanthan gum + κ-carrageenan 5-8%, the rest is clear water, and the experimental temperature is 120°C , see Table 2 for gelation.

[0044] Table 2 The gelling situation of the plugging agent prepared in Example 1

[0045]

[0046]

[0047] As shown in Table 2, the gelling time of the plugging agent is 2 to 4 hours, the final setting strength is G, and no syneresis occurs within 12 days.

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

Embodiment 2

[0050] High-density salt water stimulates the cross-linked plugging agent as the perforation protection solution, and its composition is as follows in terms of mass percentage: potassium pyrophosphate 90%, xanthan gum + κ-carrageenan concentration 1.5% to 3%, and the rest is water. The temperature is 160°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 to 8 hours, and the final setting strength is D or E. The plugging agent formula begins to dehydrate and degrade gradually on the third day, and degrades to a low mucus without solid phase 48 hours after the dehydration begins. body.

[0054] Such as figure 2 As shown, it can be seen from the viscosity-shear relationship curves of the plugging agent system with a gelling agent content of 2% at the initial stage, after 2 days and after 5 days: the initial v...

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 90%, xanthan gum + κ-carrageenan concentration is 6% to 8%, 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 to 4 hours, the final setting strength is F to H, and no syneresis occurs in 7 days. It can be used as a temporary plugging agent or water blocking agent of different strengths.

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Abstract

The invention discloses a high-density saline stimulation cross-linking type plugging agent and a preparation method and application thereof. The plugging agent consists of the following components inpercentage by mass: 10-90% 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 phosphateand potassium pyrophosphate; and the gelatinizing agent is one or more of xanthan gum and kappa-carrageenan. The gelling time of the high-density saline stimulation crosslinking plugging agent at 90-160 DEG C is 0.5-12 hours (controllable), the final set strength can reach the visual inspection code D-H (controllable), and the density can be controlled to be 1.0-1.55 g / cm<3>. The high-density saline stimulation cross-linking type plugging agent is convenient to prepare on site and high in operability, and can be widely applied to construction operations such as well completion and temporary plugging and leakage prevention of well repair of high-temperature high-pressure multi-pressure strata oil and gas wells, perforation reservoir protection and water plugging.

Description

technical field [0001] The invention relates to the technical field of oil field chemistry in the exploitation of oil and natural gas, and is widely used in construction operations such as completion and workover of oil and gas wells with high temperature and high pressure, multi-pressure layers, temporary plugging and leakage prevention, perforation reservoir protection, and water plugging. A high-density saline-stimulated cross-linking plugging agent and its preparation method and application. Background technique [0002] Nowadays, the development of oil and gas reservoirs is gradually moving towards deep and ultra-deep development, with increasing well depth and complex and changeable geological conditions, often accompanied by many challenging problems, such as high temperature, high pressure, reservoir pressure reversal, "upper injection and lower leakage" and other issues. For wells with abnormally high pressure reservoirs, the contradiction between the wellbore well ...

Claims

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Application Information

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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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