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Plugging agent for deep profile control and water plugging and preparation method thereof

A technology for deep profile control and water use, which is applied in the direction of chemical instruments and methods, and drilling compositions. Serious problems, to achieve the effect of fast gelation time, weak gelation strength, and reduced leakage

Active Publication Date: 2012-12-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patent documents solve the corresponding technical problems, but there are still the following points to be improved: cationic polymers are used in a large amount, poor injectability, high cost and serious adsorption in the formation; anionic polymers are mostly targeted at other A single group in the structure is used for cross-linking, the amount of polymer and cross-linking agent is large, the economy is poor, and it is difficult to pump into the formation; the commonly used single-group cross-linking plugging agent system cannot perform plugging adjustment and oil displacement well during the injection process combine etc.

Method used

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  • Plugging agent for deep profile control and water plugging and preparation method thereof
  • Plugging agent for deep profile control and water plugging and preparation method thereof
  • Plugging agent for deep profile control and water plugging and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Plugging agent for deep profile control and water plugging, raw material composition:

[0051] Partially hydrolyzed polyacrylamide 0.15%, potassium dichromate 0.1%, sodium sulfite 0.2%, hexamethylenetetramine 0.15%, phenol 0.12%, ammonium chloride 0.1%, the balance water.

[0052] Preparation:

[0053] Take each component according to the ratio, add partially hydrolyzed polyacrylamide powder to an appropriate amount of water and stir evenly to make a solution with a concentration of 5000mg / L, and mature it at room temperature for 5 hours, then add the matured partially hydrolyzed polyacrylamide mother liquor to the remaining amount Stir in water at 26°C for 0.5h to obtain a partially hydrolyzed polyacrylamide diluted solution; then add potassium dichromate, sodium sulfite, hexamethylenetetramine, phenol, and ammonium chloride in proportion to dilute In the solution, stir at 26°C for 0.5h to obtain the plugging agent for deep profile control and water plugging.

[0054...

Embodiment 2

[0056] As described in Example 1, the difference is that the plugging agent raw material consists of:

[0057] Partially hydrolyzed polyacrylamide 0.20%, potassium dichromate 0.08%, sodium sulfite 0.16%, hexamethylenetetramine 0.10%, phenol 0.08%, ammonium chloride 0.10%, the balance water.

[0058] Test results of the obtained plugging agent: at 60°C, the first gelation time of the plugging agent system is about 46 hours, and the second gelation time is about 285 hours; the core (permeability 1.11μm 2 ) breakthrough pressure gradient (plugging agent injection volume: 0.3PV) is 10MPa / m; the core plugging rate is 97.1%; after 10PV injection water scours, the plugging agent has a plugging rate of 92.8% on the core.

Embodiment 3

[0060] As described in Example 1, the difference is that the plugging agent raw material consists of:

[0061] Partially hydrolyzed polyacrylamide 0.25%, potassium dichromate 0.08%, sodium sulfite 0.16%, hexamethylenetetramine 0.10%, phenol 0.08%, ammonium chloride 0.10%, and the balance water.

[0062] Test results of the plugging agent obtained: at 60°C, the first gelation time of the plugging agent system is about 6 hours, and the second gelation time is about 150 hours; the core (permeability 1.08μm 2 ) breakthrough pressure gradient (plugging agent injection volume is 0.3PV) is 12MPa / m; the core plugging rate is 98.8%; after 10PV injection water scours, the plugging agent has a plugging rate of 93.4% on the core.

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Abstract

The invention relates to a plugging agent for deep profile control and water plugging and a preparation method thereof. The plugging agent comprises the following raw materials in percentage by weight: 0.10-0.30% of partially hydrolyzed polyacrylamide, 0.09-0.20% of potassium dichromate, 0.15-0.30% of sodium sulfite, 0.08-0.3% of hexamethylenetetramine, 0.06-0.24% of phenol, 0.04-0.14% of ammonium chloride and the balance of water. The invention also provides the preparation method of the plugging agent. The variation of the gelatinization strength of the plugging agent system along with time is in an obvious double-step trend. Thus, the plugging agent can be effectively prevented from leaking into a low-permeability layer in the injection process, and can effectively plug a high-permeability stratum when the plugging agent reaches the deep stratum.

Description

technical field [0001] The invention relates to a plugging agent for deep oil well profile control and water plugging and a preparation method thereof, belonging to the technical field of oil field chemistry. Background technique [0002] As an important technology to increase the sweep coefficient of oil displacement agent and enhance oil recovery, profile control and water shutoff have been widely used in oilfields. With the deepening of oilfield development, the contradiction of water flooding has also increased, the degree of heterogeneity in layers has further deteriorated, and the number of wells requiring profile control and water plugging has increased year by year. When using jelly to adjust and plug the formation, although the metal ion cross-linking agent has a strong gelling strength, its cross-linking time is short, and the profile control and water plugging operation area is limited to the near-wellbore area, and the injected water bypasses seriously, resulting...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/588
Inventor 王增宝陆红军赵修太李建山付敏杰白英睿王静高元张祖国吴川
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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