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A reservoir protection agent suitable for low-permeability gas reservoirs and its preparation method

A reservoir protective agent and gas permeation technology, which is applied in the field of oilfield drilling fluids, can solve the problems of unsatisfactory application effect, single scale, and inability to act as a seepage barrier, avoiding agglomeration and settlement, stabilizing mud shale well walls, The effect of reducing the amount of filtration

Active Publication Date: 2021-01-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing reservoir protection agents are mainly shielding temporary plugging agents, and their scale is relatively single. They cannot effectively prevent seepage in low-permeability reservoirs with low permeability and porosity, resulting in unsatisfactory actual application effects.

Method used

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  • A reservoir protection agent suitable for low-permeability gas reservoirs and its preparation method
  • A reservoir protection agent suitable for low-permeability gas reservoirs and its preparation method
  • A reservoir protection agent suitable for low-permeability gas reservoirs and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Add 50kg of deionized water into the stirred reactor at room temperature, add 0.1kg of wetting agent polyethylene glycol (molecular weight: 2000g / mol) successively under stirring, and stir for 30 minutes to completely dissolve the wetting agent in the water. Then add 2kg talc (800nm) in reactor, stir after 1 hour, add 2kg calcium carbonate (15 μm), stir after 30 minutes, add 0.1kg synthetic hectorite (300nm), continue to stir and obtain reservoir of the present invention after 30 minutes Protectant product, milky white viscous liquid.

Embodiment 2

[0033] Add 50kg of deionized water into the stirred reactor at room temperature, add 1.5kg of wetting agent polyethylene glycol (molecular weight: 2000g / mol) successively under stirring, and stir for 30 minutes to completely dissolve the wetting agent in the water. Then add 15kg talc (800nm) in the reaction kettle, add 15kg calcium carbonate (15 μm) after stirring for 1 hour, add 2kg synthetic hectorite (300nm) after stirring for 30 minutes, obtain the reservoir layer protection of the present invention after continuing to stir for 30 minutes It is a milky white viscous liquid.

Embodiment 3

[0035] Add 50kg of deionized water into the stirred reactor at room temperature, add 0.25kg of wetting agent polyethylene glycol (molecular weight: 2000g / mol) successively under stirring, and stir for 30 minutes to completely dissolve the wetting agent in the water. Then add 5kg talc (800nm) in reactor, add 4.5kg calcium carbonate (15 μ m) after stirring 1 hour, add 0.25kg synthetic hectorite (300nm) after stirring 30 minutes, continue to stir after 30 minutes and obtain storage of the present invention Layer protectant product, milky white viscous liquid.

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Abstract

The invention discloses a reservoir protection agent applicable to a low-permeability gas reservoir and a preparation method of the reservoir protection agent. The reservoir protection agent comprises, by weight, 100 parts of deionized water, 4-30 parts of calcium carbonate, 0.2-4 parts of synthetic hectorite, 4-30 parts of soapstone and 0.2-3 parts of wetting agents. The method includes the steps: sequentially adding the wetting agents, the soapstone, the calcium carbonate and the synthetic hectorite in the deionized water according to the dosage; uniformly stirring the raw materials to obtain the reservoir protection agent. The reservoir protection agent is wide in size range distribution, three solid particles with different particle diameters and different types are reasonably matchedaccording to characteristics of different porosities of various reservoirs, and permeation-resistant effects are better.

Description

technical field [0001] The invention relates to the field of oilfield drilling fluid technology, and more specifically relates to a reservoir protection agent suitable for low-permeability gas reservoirs and a preparation method. Background technique [0002] With the depletion of oil and gas resources, low-permeability reservoirs have gradually become an important technical object for oilfield development. Due to the low permeability of low-permeability reservoirs (permeability≤0.1×10 -3 μm 2 ), the porosity is small, and how to effectively develop and establish the natural production capacity of a single well has always been a technical bottleneck restricting the large-scale production of low-permeability reservoirs. At present, more and more oilfields are developed using the horizontal well production method, the purpose of which is to increase the drainage area of ​​the reservoir to increase the productivity of a single well. However, in the development process of hor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03
Inventor 宋兆辉金军斌蔡利山林永学宣扬褚奇杨枝唐文泉
Owner CHINA PETROLEUM & CHEM CORP