Applications of aluminum salt complex in preparation of drilling fluid, and drilling fluid

A technology of drilling fluids and complexes, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as low permeability, inability to effectively improve the compressive strength of rock cores, and poor wellbore stability. Achieving good wall-reinforcement ability, improving wellbore wall stability, and increasing compressive strength

Active Publication Date: 2017-11-03
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned film-forming and wall-solidifying agent mainly forms a low-permeability sealing and plugging film (shell) on the rock surface of the borehole wall through filling, adsorption, cross-linking and bonding, effectively plugging different permeability formations and existing fractured mudstone formations. To a certain extent, it can reduce the amount of water in the drilling fluid and filtrate, but it cannot effectively improve the compressive strength of the core, and the stability of the wellbore wall is not very good.

Method used

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  • Applications of aluminum salt complex in preparation of drilling fluid, and drilling fluid
  • Applications of aluminum salt complex in preparation of drilling fluid, and drilling fluid
  • Applications of aluminum salt complex in preparation of drilling fluid, and drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In the reaction vessel, add 13.334g of aluminum chloride into 100g of water, fully dissolve, slowly add 10g of ammonium fluoride under stirring state, white turbidity appears, control pH value to 4, complexation temperature is 10°C, stir for 2 hours, static After standing for 1 h, a clear solution appeared in the upper layer, and a white precipitate appeared at the bottom of the container. After filtering, the obtained solid was dried at 60° C. to obtain 23 g of the target product in the form of white powder.

[0042] The product is a complex formed by the two compounds of aluminum chloride and ammonium fluoride, which is an aluminum salt complex with the general formula of formula I, which contains complexed aluminum ions, and B in formula I + for NH 4 + . At room temperature, the solubility of the product in an aqueous solution with a pH value of 8-10 is 15-50 g / L.

Embodiment 2

[0044] In the reaction vessel, add 13.334g of aluminum chloride into 100g of water, fully dissolve, slowly add 20.0g of potassium fluoride under stirring state, white turbidity appears, control pH value to 5, complexation temperature to 20°C, stir for 2 hours, After standing for 1 h, a clear solution appeared in the upper layer, and a white precipitate appeared at the bottom of the container. After filtering, the obtained solid was dried at 60° C. to obtain 30 g of the target product in the form of white powder.

[0045] The product is a complex formed by these two compounds of aluminum chloride and potassium fluoride, which is an aluminum salt complex with the general formula of formula I, which contains complexed aluminum ions, and B in formula I + for K + . At room temperature, the solubility of the product in an aqueous solution with a pH value of 8-10 is 15-50 g / L.

Embodiment 3

[0047] In the reaction vessel, add 13.334g of aluminum chloride into 100g of water and fully dissolve it. Slowly add 25.2g of sodium fluoride under stirring, and white turbidity will appear. Control the pH value to 6, and the complexation temperature to 30°C. Stir for 3 hours. After standing for 2 hours, a clear solution appeared in the upper layer, and a white precipitate appeared at the bottom of the container. After filtering, the obtained solid was dried at 60° C. to obtain 37 g of the target product in the form of white powder.

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Abstract

The present invention provides applications of an aluminum salt complex in preparation of a drilling fluid, wherein the aluminum salt complex has a general formula represented by a formula I. The invention provides a drilling fluid, which comprises a wall fixation material, wherein the wall fixation material is the aluminum salt complex having the general formula represented by the formula I, and B<+> is one or two selected from Na<+>, K<+> and NH4<+> in the formula I. According to the present invention, the aluminum salt complex having the general formula represented by the formula I exists in the complex ion form at the conventional drilling fluid pH value, and has little influence on the rheological property of the drilling fluid; after the Al<3+> enters the stratum along with the filtrate, the Al<3+> reacts with the stratum minerals at a certain temperature under a certain pH value to produce chemical cementation, such that the micro-crack is sealed so as to increase the stratum strength; Na<+>, K<+> or NH4<+> can inhibit the bentonite hydration expansion so as to further improve the wall stability; and the experimental results show that the aluminum salt complex has good wall fixation ability so as to significantly improve the compressive strength of the rock core. The formula I is defined in the specification.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical additives, in particular to the application of an aluminum salt complex in preparing drilling fluid and the drilling fluid. Background technique [0002] In recent years, with the accelerated exploration and development of unconventional oil and gas reservoirs, the probability of drilling hard and brittle shale formations has increased significantly. Part of the micro-fractures developed in the hard and brittle shale is an important cause of wellbore instability. Under the action of pressure difference, capillary force and chemical potential difference, the drilling fluid filtrate enters the formation along the micro-fractures, causing the clay minerals to hydrate and expand. , the pore pressure increases rapidly, and at the same time, due to the entry of the liquid phase, the micro-fractures expand and extend, reducing the bonding strength of the shale and the bonding force between bedd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/06C09K8/12
CPCC09K8/06C09K8/12C09K2208/12
Inventor 李晓岚孙举苏雪霞史沛谦张丽君张东升
Owner 中石化石油工程技术服务有限公司
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