Microcapsule for retarding oil gas well working fluid additive release and preparation method thereof

A technology of working fluid and admixture, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of limited delayed release effect, inability to meet pump pressure, complicated preparation process, etc., and achieves low production cost and scope of application. Wide and simple preparation process

Inactive Publication Date: 2008-03-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The delayed release effect of the above-mentioned microcapsules is limited, the preparation process is relatively complicated, and its own pressure bearing capacity is very small, which cannot meet the cementing operations and hydraulic fracturing operations with high pump pressure and high temperature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, preparation and performance evaluation of early-strength coagulant accelerator microcapsules

[0020] Prepare 20% Al 2 (SO 4 ) 3 To 1 part of the solution, add 1.2 parts of porous aluminosilicate pellets (waste microsphere silica-alumina catalyst, China University of Petroleum (East China) Shenghua Oil Refinery), and dry the porous aluminosilicate pellets after adsorption for 20 minutes; Weigh 2.2 parts of ethyl cellulose and 0.8 parts of polyvinyl butyral into a mixed organic solvent of 70 parts of acetone and 30 parts of cyclohexane to prepare a 3.0% shell material solution; weigh 1 part of the adsorbed Al 2 (SO 4 ) 3 Porous aluminosilicate pellets were added to 1.5 parts of a 3.0% shell material solution, and spray-dried in an air stream at 95°C to obtain early-strength coagulant accelerator microcapsules, code-named sample A.

[0021] Add a certain mass percentage (based on the cement mass) of sample A to Shengwei Oil Well G grade cement, prepare ...

Embodiment 2

[0024] Embodiment 2, preparation and performance evaluation of gel strength coagulant microcapsules

[0025] Prepare 30% NaAlO 2 To 1 part of the solution, add 1.2 parts of porous aluminosilicate pellets (waste clay Y-type zeolite catalyst, China University of Petroleum (East China) Shenghua Oil Refinery), and dry the porous aluminosilicate pellets after adsorption for 20 minutes; Weigh 1.8 parts of ethyl cellulose and 0.7 parts of polyvinyl butyral into a mixed organic solvent of 75 parts of acetone and 25 parts of cyclohexane to prepare a 2.5% shell material solution; weigh 1 part of adsorbed NaAlO 2 The porous aluminosilicate pellets were added to 1.5 parts of a 2.5% shell material solution, and spray-dried in an air stream at 80°C to obtain gel strength accelerator microcapsules, code-named sample B.

[0026]Add a certain mass percentage (based on the cement quality) of sample B to Shengwei Oil Well G grade cement, prepare cement slurry with a water-cement ratio of 0.44 a...

Embodiment 3

[0029] Embodiment 3, preparation and performance evaluation of retarder microcapsules

[0030] Prepare 1 part of 20% citric acid solution, add 1.2 parts of porous aluminosilicate pellets (waste rare earth Y-type zeolite catalyst, China University of Petroleum (East China) Shenghua Oil Refinery), and after 20 minutes of adsorption, the porous aluminosilicate Dry the pellets; weigh 1.5 parts of ethyl cellulose and 1.5 parts of polyvinyl butyral and add them to a mixed organic solvent of 60 parts of acetone and 40 parts of cyclohexane to prepare a 3.0% shell material solution; weigh 1 part of porous aluminosilicate pellets with adsorbed citric acid was added to 1.5 parts of 3.0% shell material solution, and spray-dried in an air stream at 95°C to obtain retarder microcapsules, code-named sample C.

[0031] Add a certain mass percentage (based on the cement mass) of sample C to Shengwei Oil Well G grade cement, prepare cement slurry with a water-cement ratio of 0.44 according to t...

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PUM

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Abstract

The invention provides a microcapsule for delaying the release of working fluid additives in oil and gas well and a method for preparing the same, which belongs to oilfield chemical field. The invented microcapsule is formed by 3.5-25 percent of working fluid additive in oil and gas well, 70-94 percent of aluminosilicate beads, 2-5 percent of polymer membrane, wherein the working fluid additive in oil and gas well is one of oil well cement early strength accelerator, gel strength accelerator, retarder or fracturing fluid crosslinking agent, gel breaker, the aluminosilicate beads are waste catalysts with 10-250 um particle size and 0.20-0.60cm3/g pore volume 0.20-0.60cm3/g, the polymer membrane is non water-soluble polymer with 0.02-03 million relative molecular mass. The prepared microcapsules have good effect of delaying release, pressure resistance, temperature resistance, and wide application range. The main raw material of aluminosilicate beads for preparing microcapsules belongs to waste reutilization, which is economical and environment-friendly. Furthermore, the microcapsule preparation technology of the invention is simple and the production cost is low, which is beneficial for industrial production.

Description

technical field [0001] The invention relates to a microcapsule for delaying the release of an oil and gas well working fluid admixture and a preparation method thereof, in particular to a coagulation accelerator capable of delaying the early strength of oil and gas well cementing, a gel strength accelerator, a retarder and water-based fracturing The invention relates to a microcapsule released by a liquid crosslinking agent and a gel breaker and a preparation method thereof, belonging to the field of oil field chemistry. Background technique [0002] In the process of cementing in shallow layers of oil and gas wells, in deep water or in cold regions, it is often necessary to add a certain amount of early-strength coagulant in order to shorten the waiting time of cement slurry, but the addition of early-strength coagulant undoubtedly makes cement The slurry becomes thicker, and the cement slurry has a large consistency and poor fluidity at the beginning, and even the cement s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/92
Inventor 王成文王瑞和步玉环
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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