Profile controlling and flooding composition and profile controlling and flooding method

A composition and flood control technology, which is applied in drilling compositions, chemical instruments and methods, earthwork drilling and production, etc., can solve the problems of complex preparation process, limited scope of application, low viscosity of base fluid, etc., and achieve good dispersion , reduce the penetration ability, and stabilize the state

Active Publication Date: 2015-05-27
PETROCHINA CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The patent document with the notification number CN1464007A discloses a temperature-resistant and salt-resistant water-absorbing resin. Although it can drive and plug some oil fields with large pores and large fractures, the water-absorbing resin is only suitable for oil fields below 150°C. High ultra-low permeability oilfields

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  • Profile controlling and flooding composition and profile controlling and flooding method
  • Profile controlling and flooding composition and profile controlling and flooding method
  • Profile controlling and flooding composition and profile controlling and flooding method

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Example Embodiment

[0043] Example 1

[0044] In the adjusting and flooding composition of this embodiment, the first plugging agent comprises: 0.09 parts by weight of xanthan gum, 0.26 parts by weight of ammonium chloride, 0.8 parts by weight of octylphenol polyoxyethylene ether, 1.5 parts by weight of aluminum hydroxide and water 98.21 parts by weight, and the first plugging agent contains 350ppm polyacrylamide; the second plugging agent includes: 0.18 parts by weight of aluminum citrate, 0.21 parts by weight of sodium dichromate, 1.2 parts by weight of acetic acid, and 0.6 parts by weight of sodium thiosulfate and 97.36 parts by weight of water. After testing, the pH value (25°C) of the first plugging agent is 10.2, and the density after mixing the two plugging agents is (25°C) 1.12g / cm 3 , the insoluble matter in water is 3.5, and the salt resistance is 35×10 4 mg / l, the gel is thermally stable for more than 300 days.

Example Embodiment

[0045] Example 2

[0046] In the control and drive composition of this embodiment, the first plugging agent comprises: 0.09 parts by weight of xanthan gum, 0.26 parts by weight of ammonium chloride, 0.4 parts by weight of nonylphenol polyoxyethylene ether, and 0.4 parts by weight of octylphenol polyoxyethylene ether Parts by weight, 1 part by weight of aluminum hydroxide, 1.2 parts by weight of sodium and soil, 1.5 parts by weight of zeolite powder and 98.21 parts by weight of water, and the first plugging agent contains 350ppm of polyacrylamide; the second plugging agent includes: citric acid 0.18 parts by weight of aluminum, 0.21 parts by weight of sodium dichromate, 1.2 parts by weight of acetic acid, 0.6 parts by weight of sodium thiosulfate, 1.2 parts by weight of sodium chloride, 1.5 parts by weight of zeolite powder and 97.36 parts by weight of water. After testing, the pH value (25℃) of the first plugging agent is 10.5, and the density after mixing the two plugging age...

Example Embodiment

[0047] Example 3

[0048] In the driving composition of this embodiment, the first plugging agent comprises: 0.11 parts by weight of xanthan gum, 0.34 parts by weight of ammonium chloride, 1.2 parts by weight of dinonyl polyoxyethylene ether, 2.5 parts by weight of aluminum hydroxide, sodium 3 parts by weight of soil and 98.6 parts by weight of water, and the first plugging agent contains 430ppm of polyacrylamide; the second plugging agent includes: 0.23 parts by weight of aluminum citrate, 0.21 parts by weight of sodium dichromate, and 1.2 parts by weight of acetic acid , 0.6 parts by weight of sodium thiosulfate, 3 parts by weight of zeolite powder and 97.32 parts by weight of water. After testing, the pH value (25°C) of the first plugging agent is 10.8, and the density after mixing the two plugging agents is (25°C) 1.1g / cm 3 , the insoluble matter in water is 3.7, and the salt resistance is 35×10 4 mg / l, the gel is thermally stable for more than 300 days.

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Abstract

The invention provides a profile controlling and flooding composition and a profile controlling and flooding method. The profile controlling and flooding composition comprises a first blocking agent and a second blocking agent, wherein the first blocking agent comprises the following components in parts by weight: 0.08-0.11 part of xanthan gum, 0.25-0.34 part of a retarder, 0.8-1.2 parts of a nonionic surfactant, 1-3 parts of aluminum hydroxide and 98-99 parts of water; the first blocking agent also contains 350ppm to 430ppm of polyacrylamide; the second blocking agent comprises the following components in parts by weight: 0.18-0.23 part of aluminum citrate, 0.18-0.21 part of sodium dichromate, 0.8-1.2 part of acetic acid, 0.4-0.6 part of a gel accelerant and 97-98 parts of water. The profile controlling and flooding composition is good in blocking property in oil preservation at a temperature higher than 150 DEG C, simple in gel formation process, resistant to scouring, wide in application range and capable of realizing both water flooding and alkali flooding.

Description

technical field [0001] The invention relates to a control and flooding composition and a control and flooding method, belonging to the technical field of oil and gas well development control and flooding. Background technique [0002] my country's low-permeability and ultra-low-permeability oilfields are relatively rich in reserve resources. With the advancement of petroleum exploration and development technology, the proportion of proven and produced geological reserves in low-permeability oilfields to the total geological reserves has increased significantly. According to preliminary statistics, among the recent proven reserves, low-permeability reserves account for as high as 60%-70%. These low-permeability oil fields have the characteristics of wide reservoir area, large reserves, low abundance, poor physical properties, and difficult development. The development of low-permeability and ultra-low-permeability oilfield reserves has become an important potential for the st...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/58C09K8/514C09K8/512E21B33/12E21B43/22
CPCC09K8/512E21B33/13
Inventor 王小培唐长久尹红卫唐颖王洪峰徐明军黄钟新凌涛宋晓俊王勇秦振杰乔霞
Owner PETROCHINA CO LTD
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