Unblocking agent for polymer gel profile control agent

The technology of profile control agent and blocking agent is applied in the field of blocking agent for polymer gel profile control agent, which can solve the problems of slow breaking speed and insufficient breaking of glue, and achieve fast breaking speed and breaking ability of glue. strong effect

Inactive Publication Date: 2010-12-29
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a plugging release agent for polymer gel profile control agent with good gel breaking ability, which avoids the problems of slow gel breaking speed and insufficient gel breaking of existing polymer plugging release agents

Method used

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  • Unblocking agent for polymer gel profile control agent
  • Unblocking agent for polymer gel profile control agent
  • Unblocking agent for polymer gel profile control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1 Hydrogen peroxide is to the gel breaking experiment of gel

[0009] Take an equal volume of the gel system that has been gelled, and then add 2%, 4%, 6%, 8%, and 10% hydrogen peroxide solution at a concentration twice that of the gel volume, put it in a constant temperature water bath, and perform it every 20 minutes Viscosity measurement, until the gel is broken, measure the viscosity of the gel system after curing for different times.

[0010] The test results of the blocking release agent for the polymer gel profile control agent in this example are shown in Table 1 below.

[0011] The gel breaking data of table 1 hydrogen peroxide

[0012]

[0013] It can be seen from Table 1 that the gel breaking of hydrogen peroxide is obvious, and as the concentration increases, the gel breaking time and speed gradually increase. When the hydrogen peroxide concentration reached 8%, the gel began to break after 2 hours.

Embodiment 2

[0014] Example 2 Hydrogen peroxide and hydrochloric acid compound solution to gel breaking experiment

[0015] Take an equal volume of the gel system that has been gelled, and then add respectively 2%, 4%, 6%, 8%, and 10% compound plugging remover solutions with a concentration twice the volume of the gel, and put it in a constant temperature water bath. Viscosity measurement was performed every 20 minutes until the gel was broken, and the viscosity of the gel system after curing for different time was measured.

[0016] The test results of the plug-releasing agent for the polymer gel profile control agent in this embodiment are shown in Table 2 below.

[0017] Table 2 The gel-breaking data of the compound plugging remover (15% hydrogen peroxide+15% hydrochloric acid, the balance being water. The percentages here are percentages by weight)

[0018]

[0019] It can be seen from the table that with the increase of the concentration of the compound plugging remover solution, ...

Embodiment 37

[0020] Example 37.5% hydrogen peroxide and 22.5% hydrochloric acid compound solution to gel breaking experiment

[0021] Take an equal volume of the gel system that has been gelled, and then add respectively 2%, 4%, 6%, 8%, and 10% compound plugging remover solutions with a concentration twice the volume of the gel, and put it in a constant temperature water bath. Viscosity measurement was carried out every 1 hour until the gel was broken, and the viscosity of the gel system after curing for different time was measured.

[0022] The test results of the plug-releasing agent for the polymer gel profile control agent in this embodiment are shown in Table 3 below.

[0023] Table 3 The gel breaking data of the compound plugging remover (7.5% hydrogen peroxide+22.5% hydrochloric acid, the balance is water. The percentage here is weight percentage) solution

[0024]

[0025] It can be seen from the above table that the gel breaking effect of the compound plugging remover solution...

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Abstract

The invention discloses an unblocking agent for a polymer gel profile control agent. The unblocking agent for the polymer gel profile control agent comprises hydrogen peroxide and industrial hydrochloric acid, has the advantages of temperature resistance, salt resistance, fast gel breaking and strong gel breaking capability and solves the problems of slow gel breaking and insufficient gel breaking of the traditional polymer unblocking agent. The gel breaking time of the unblocking agent for the polymer gel profile control agent is shorter than 2 hours, the tolerable temperature reaches 85 DEG C and the maximum mineralization degree (based on sodium chloride) is 40,000 mg / L (the solution is prepared based on sea water); and 15 weight percent of hydrogen peroxide and 15 weight percent of industrial hydrochloric acid or 7.5 weight percent of hydrogen peroxide and 22.5 weight percent of industrial hydrochloric acid are mixed respectively, and the blocking can be completely removed after 2 hours of experiment.

Description

technical field [0001] The invention relates to a plug-removing agent for a polymer gel profile control agent with good gel breaking ability. Background technique [0002] With the continuous exploitation of oil in the reservoir, most early-developed oilfields have entered the stage of high water cut production, which seriously affects the recovery rate. Many oilfields have successively adopted polymer gel profile control agents for water plugging. With the increase of injection volume, some formations that have been blocked need to be unsealed again; at the same time, the gel polymer injection mining process continues to expand, and it is necessary to break the polymer profile control agent to reduce the damage of the polymer residue to the formation, so as to facilitate the injection , Improve the recovery rate. [0003] The existing technologies are generally some organic slow-release acids, such as trichlorotoluene, dichlorotoluene, and chlorotoluene. H+ is slowly rele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52
Inventor 童志能莫成孝李学军刘庆旺范振忠
Owner CHINA NAT OFFSHORE OIL CORP
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