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A kind of oil-soluble temporary plugging agent and preparation method thereof

An oil-soluble temporary plugging agent and technology of temporary plugging agent, applied in chemical instruments and methods, drilling compositions and other directions, can solve problems such as workover fluid leakage, achieve less damage to oil layers, avoid oil and gas layer pollution, and improve The effect of blocking removal rate

Active Publication Date: 2018-06-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides an oil-soluble temporary plugging agent and its preparation method, which solves the problem of workover fluid loss when the temporary plugging agent prepared in the prior art is applied to high-temperature leakage oil and gas reservoirs with a depth of more than 3500 meters. technical issues

Method used

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Examples

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Effect test

preparation example Construction

[0024] The preparation method of the oil-soluble temporary plugging agent comprises the preparation step of temporary plugging material and the preparation step of oil-soluble temporary plugging agent. The preparation of the temporary plugging material includes steps S1-S2:

[0025] S1. Mix C5 petroleum resin, modified petroleum resin and rosin-modified phenolic resin in a mass ratio of 45:45:10, and then pulverize.

[0026] S2. Pass the pulverized mixture through a 40-mesh sieve and an 80-mesh sieve in sequence, and bag the remaining material after the 80-mesh sieve and the material under the sieve respectively for later use.

[0027] Further, in order to save raw materials, the following steps are also included after step S2: after re-crushing the sieve residue of the 40 mesh sieve, passing through the 40 mesh sieve and the 80 mesh sieve in turn, and then the sieve residue material after the 80 mesh sieve and the under-sieve The materials should be bagged for standby, and t...

example 1

[0034] Example 1: Prepare 100 parts of temporary plugging agent

[0035] Put 92 parts of tap water into the mixing tank, add 5 parts of potassium chloride into the mixing tank, and stir evenly to form a solution; then slowly add 0.5 parts of xanthan gum to the liquid in the mixing tank through the feeding funnel, and stir for 2 hours; use drilling fluid After measuring the viscosity value with a Marsh funnel to be greater than 35s, under stirring conditions, mix 1.5 parts of the temporary plugging material remaining on the 80-mesh sieve and 1 part of the temporary plugging material under the 80-mesh sieve to prepare an oil-soluble temporary plugging agent.

[0036] The density of the oil-soluble temporary plugging agent workover fluid prepared by Example 1 is 1.03g / cm3, the apparent viscosity is 17.5mPa.s, and the API (American Petroleum Institute, American Petroleum Institute) dehydration rate is 27mL / After 30 minutes, the plastic viscosity is 11mPa.s, and the high-pressure ...

example 2

[0041] Example 2: Prepare 100 parts of temporary plugging agent

[0042] Put 94.5 parts of tap water into the mixing tank, add 3 parts of potassium chloride into the mixing tank, and stir evenly to form a solution; then slowly add 0.5 parts of xanthan gum to the liquid in the mixing tank through the feeding funnel, and stir for 2 hours; use drilling fluid After measuring the viscosity with a Marsh funnel to be greater than 35s, add 1.0 part of temporary plugging material remaining on a 80-mesh sieve and 0.55 part of temporary plugging material under an 80-mesh sieve under stirring conditions, and stir evenly to prepare an oil-soluble temporary plugging agent.

[0043] The temporary plugging agent prepared in Example 2 was applied to an oil and gas well with a well depth of 3,450 meters and a bottom hole temperature of 132°C. The plugging operation was successful, and the production recovery rate after operation could reach 97%. .

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Abstract

The invention discloses an oil-soluble temporary plugging agent and a preparation method thereof, which solves the technical problem of workover fluid leakage during the workover process of high-temperature lost oil and gas reservoirs. The oil-soluble temporary plugging agent is composed of the following components by weight: 0.5-2 parts of C5 petroleum resin, 0.5-2 parts of modified petroleum resin, 0.1-0.5 parts of rosin modified phenolic resin, and 0.4-0.6 parts of xanthan gum 2-5 parts of potassium chloride, and the rest is water; wherein, the softening point of C5 petroleum resin is greater than or equal to 140°C, and the softening point of modified petroleum resin is greater than or equal to 145°C. It can prevent the foreign fluid in the wellbore of the oil and gas well above 3500 meters from invading and polluting the oil layer.

Description

technical field [0001] The invention relates to the technical field of oil and gas development, in particular to an oil-soluble temporary plugging agent and a preparation method thereof. Background technique [0002] The main component of oil-soluble temporary plugging agent is oil-soluble resin, which has been widely used in oil and gas well workover operations due to its high oil solubility, easy plugging and reverse flow, convenient construction, and small formation damage. Workover technology to effectively protect the reservoir. The plugging principle of oil-soluble resin is: the temporary plugging material forms a shielding temporary plugging layer near the channel when the leakage channel is lost to the formation, preventing the liquid from further leaking into the formation, ensuring the smooth completion of the workover operation and preventing the leakage in the wellbore. Invasion of foreign fluids into contaminated oil reservoirs. After the operation is complete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508
Inventor 刘福鹏韩芳樊松林郭元庆辉建超王小芳周小平景海权曾晓辉
Owner PETROCHINA CO LTD
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