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High-strength supramolecular crack rapid blocking agent

A supramolecular and plugging agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of shallow plugging of inorganic particle plugging agents, difficult to plug cracks, low strength of plugging agents, etc., and achieve pressure-bearing The effect of capacity improvement, good crack plugging and high water expansion rate

Inactive Publication Date: 2016-03-02
XIAN AOLI PETROLEUM ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These granular plugging agents are not cross-linked in the fracture, and the initial strength of the plugging agent is low, making it difficult to plug the leakage of the fracture.
[0003] In the post-water injection development of the oilfield, the channeling along the fractures and fractures is injected, and the inorganic particle composite plugging agent and polyacrylamide jelly plugging agent are also developed to plug the fractures. The inorganic particle plugging agent has shallow plugging, short validity period and poor selectivity.

Method used

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  • High-strength supramolecular crack rapid blocking agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare supramolecular AM (polyamide-amine dendritic polymer) with Span 80 and white oil in a weight ratio of 2:6, and mix them evenly as the base liquid and put them in the reaction kettle for later use, mix evenly; then put the base liquid Heat to 35-80°C to polymerize, and the plugging agent particles generated by polymerization should be placed in a kettle, and stirred and mixed evenly.

[0019] The main component of Span 80 in the present invention is sorbitan monooleate. .

Embodiment 2

[0020] Embodiment 2: plugging agent performance test

[0021] 1. Compatibility with oil-based drilling fluid

[0022] Since the plugging agent has a certain activity, whether it can be compatible with oil-based drilling fluid becomes a key to the successful application of the plugging agent. Therefore, laboratory tests were carried out on the compatibility of plugging agent and oil-based drilling fluid, and the effects of different dosages of plugging agent on the rheological properties and electrical stability of oil-based drilling fluid were tested and studied. The test data are shown in Table 1.

[0023] It can be seen from Table 1 that the addition of plugging agent has little effect on the viscosity and demulsification voltage of the system, indicating that the plugging agent has good compatibility with oil-based drilling fluid and meets the requirements of drilling operations.

[0024] Table 1. Effect of plugging agent dosage on drilling fluid system performance

[00...

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Abstract

The invention discloses a high-strength supramolecular crack rapid blocking agent. The high-strength supramolecular crack rapid blocking agent is composed, by weight, 2 to 4 parts of a base liquid, and 1 part of a blocking agent particle; and the base liquid contains supermolecules. The high-strength supramolecular crack rapid blocking agent possesses relatively high water absorption expansion rate at high temperature; crosslinking and expansion are not caused in crude oil; selective crack blocking can be realized preferably; and application prospect in oil-water well profile control and water plugging is promising, and market value is high.

Description

technical field [0001] The invention belongs to the technical field of oil field chemistry, and in particular relates to a supramolecular plugging agent for rapid plugging of high-strength fractures. Background technique [0002] The investment in oil development is huge, and the leakage of drilling fluid and the channeling of injected water seriously affect the comprehensive economic benefits of oil and gas fields. In the process of drilling, if complex fractured formations are encountered, a large amount of drilling fluid will be lost, which not only affects the drilling efficiency, but also causes immeasurable economic losses. Therefore, it is necessary to strengthen the sealing performance of the drilling fluid to achieve the purpose of safe drilling. In China, a lot of research work has been done on improving the plugging performance of drilling fluid, but less research has been done on fracture plugging. Zhang Fan et al. synthesized a kind of expansion plugging agent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44
CPCC09K8/44
Inventor 陈峰王萌邢艳斌
Owner XIAN AOLI PETROLEUM ENG CO LTD
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