Heat-resistant and salt-resistant profile controlling agent and preparation method thereof

A technology of temperature and salt resistance and profile control agent, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of poor temperature resistance and salt resistance, low plugging efficiency by two-liquid method, and large-displacement horizontal well operations. High risk and other problems, to achieve the effect of excellent temperature resistance and salt resistance

Active Publication Date: 2013-03-27
CHINA PETROLEUM & CHEM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (1) Silicate: the cost of profile control is high, and the operation risk of extended-reach horizontal well is relatively high;
[0007] (2) Sodium silicate: the double-liquid method has low plugging efficiency and is difficult to remove;
[0008] (3) Polymers: poor temperature and salt resistance, short validity period, high cost of profile control
[0015] With the deepening of oilfield water injection development, the number of water injection breakthrough well groups is increasing, and the water injection efficiency is gradually declining; in order to improve the oil recovery of carbonate rocks, it is urgent to carry out research on profile control technology; but the current conventional profile control agents have high cost, Disadvantages of poor heat and salt resistance and short validity period
In addition, a large amount of waste mud generated during the drilling process, such as direct landfill or solidification treatment, will inevitably cause varying degrees of pollution to the environment

Method used

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  • Heat-resistant and salt-resistant profile controlling agent and preparation method thereof
  • Heat-resistant and salt-resistant profile controlling agent and preparation method thereof
  • Heat-resistant and salt-resistant profile controlling agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] The density generated during the drilling of oil and gas wells in Tahe Oilfield was 1.30g / cm 3 1000g of waste mud (the composition of which is 0.5% crude oil and the metal ions are mainly Ca 2+ , Mg 2+ , the content is 11100mg / L, 930mg / L respectively; the organic content is 8.8%, the inorganic content is 91.2%, and the inorganic content includes debris, fine-grained calcium carbonate, iron sulfate and mineral salts. Add to the paddle mixer, take the weight of the waste mud as 100%, use 6% by weight of microsilicon as waste mud solidifying agent, 6% by weight of fly ash as strength modifier, 0.2% of sulfonated Tannin extract as dispersant, 0.15% Na 2 CO 3 As a retarder and 12% oil field treated water, it is directly added to the waste mud to make a mixed solution to obtain profile control agent 1 # , the profile control agent was placed at room temperature for 66h and no thickening phenomenon was found. The density, viscosity, static curing strength, static curing cu...

Embodiment 2

[0092] The density generated during the drilling of oil and gas wells in Tahe Oilfield was 1.32g / cm 31000g of waste mud (in which the composition is 1.5% crude oil, and the metal ions are mainly Ca 2+ , Mg 2+ , the content is 10000mg / L, 900mg / L respectively; the organic content is 7%, the inorganic content is 93%, and the inorganic content includes debris, fine-grained calcium carbonate, iron sulfate and mineral salts. Add to the paddle mixer, take the weight of the waste mud as 100%, use 8% by weight of microsilicon as waste mud solidifying agent, 8% by weight of fly ash as strength modifier, 0.5% of sulfonated Tannin extract as dispersant, 0.05% Na 2 CO 3 As a retarder and 10% oil field treated water, it is directly added to the waste mud to make a mixed solution to obtain profile control agent 2 # , the profile control agent was placed at room temperature for 70h and no thickening phenomenon was found. The density, viscosity, static curing strength, static curing curing...

Embodiment 3

[0094] The density generated during the drilling of oil and gas wells in Tahe Oilfield was 1.35g / cm 3 1000g of waste mud (in which the composition is 1.0% crude oil, and the metal ions are mainly Ca 2+ , Mg 2+ , the content is 12000mg / L, 1000mg / L respectively; the organic content is 10%, the inorganic content is 90%, and the inorganic content includes debris, fine-grained calcium carbonate, iron sulfate and mineral salts. Add to the paddle mixer, take the weight of the waste mud as 100%, use 9% by weight of microsilicon as waste mud solidifying agent, 9% by weight of fly ash as strength modifier, 0.8% of sulfonated Tannin extract as dispersant, 0.08% Na 2 CO 3 As a retarder and 9% oil field treated water, it is directly added to the waste mud to make a mixed solution to obtain profile control agent 3 # , the profile control agent was placed at room temperature for 72h and no thickening phenomenon was found. The density, viscosity, static curing strength, static curing curi...

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Abstract

The invention discloses a heat-resistant and salt-resistant profile controlling agent, comprising waste slurry, a slurry curing agent, a strength modifier, a dispersant, a retarder and water. Based on the weight of the waste slurry as 100%, the profile controlling agent comprises 6-12 wt% of the slurry curing agent, 6-12 wt% of the strength modifier, 0.1-1.5 wt% of the dispersant, 0.02-0.15 wt% of the retarder and 6-12 wt% of water. The invention also relates to a preparation method of the heat-resistant and salt-resistant profile controlling agent. The heat-resistant and salt-resistant profile controlling agent is obtained by the steps of adding the slurry curing agent, the strength modifier, the dispersant, the retarder and water in the waste slurry, based on the weight of the waste slurry, and standing for 66-78 hours. The invention also provides an application of the waste slurry in preparing the heat-resistant and salt-resistant profile controlling agent.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant profile control agent, in particular to a temperature-resistant and salt-resistant profile control agent prepared from waste mud and a preparation method thereof. Background technique [0002] During the drilling of oil and gas wells, a large amount of waste mud is produced. Contains certain crude oil, metal ions, residual chemicals and some minerals. Generally, through exposure to the sun and landfill treatment, it not only pollutes the environment a lot, but also wastes resources. How to make waste mud harmless and comprehensively utilize resources, not only protect the environment, but also increase waste reuse, has attracted more and more attention from the industry. [0003] In the currently developed oilfields, the reservoirs have the characteristics of deep burial, high formation temperature and high salinity. The existing technology profile control agents are difficult to mee...

Claims

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Application Information

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IPC IPC(8): C09K8/467
Inventor 王雷潘阳秋李新勇曾文广张志宏欧阳冬冯一波张坤灵
Owner CHINA PETROLEUM & CHEM CORP
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