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Shale hydration inhibition agent

A hydration inhibitor, water-based technology, applied in the field of drilling fluids, which can solve problems such as high fluid loss, increased salinity, and reduced functional characteristics of drilling fluids

Active Publication Date: 2019-09-20
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, salt flocculates the clay, which leads to high fluid loss and almost complete loss of thixotropy
In addition, increasing salinity generally reduces the functional properties of the drilling fluid

Method used

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  • Shale hydration inhibition agent
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  • Shale hydration inhibition agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0075] Example compound 2

[0076] Also DPA-PG from Air Products

[0077]

[0078] The Roller Oven Shale Stability test (API Recommended Practice 13I Section 23) was performed using shale (Pierre II Shale) ground to a particle size of less than 4 mm (5 mesh) and greater than 2 mm (10 mesh) ). The pellets were equally divided into 20 gram samples. Each weighed sample was placed in a glass bottle with 350 ml of test fluid and hot rolled in a roller oven at 160°F for 16 hours. The samples were then sieved through a 35 mesh screen (0.5 mm) and washed with deionized water, then dried and reweighed.

[0079] Table 1 shows the data of the roller oven shale stability test. Mass fraction of recovered shale

[0080] Higher values ​​indicate improved shale inhibition.

[0081] Table 1

[0082]

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PUM

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Abstract

Additives that act to control clay swelling in drilled formations without adversely effecting properties of the drilling fluid are comprised of bis-3-aminopropyl ether amine functionalities, a derivative thereof, or mixtures thereof. The amine is derived by bis-cyanoethylation of terminal hydroxyl functionalities and subsequent hydrogenation of the nitrile end groups to bis-3-aminopropyl primary amines. The backbone comprises a di-ethers or polyethers based on: ethylene oxide (EO), propylene oxide (PO), and all potential isomers of butyl di-or polyethers. Such bis-3-aminopropyl ether amines may include, but are not limited to amines with the following formula: H2N-R'-O-(RO)x-R'-NH2 where R' is (CH2)3; and R is: 1.) C2H4, with x being 2-10, or 2.) branched C3H6, with x being 1-17, or 3.) branched or linear C4H8, with x being 1-15, or 4.) linear C6H12, with x being 1, or 5.) cyclohexyl-1,4-dimethyl, with x being 1 and mixtures thereof, including, without limitation, Jeffamines (D, M, or XTJ series polyether amines), potassium chloride, choline chloride, and derivatives including partial acid salts of the amines such as those from mineral acids or carboxylic acids with 1-6 carbons.

Description

[0001] Background of the invention [0002] Drilling fluids used in rotary drilling of subterranean wells are expected to perform a number of functions. For example, the drilling fluid needs to carry the cuttings from below the drill bit along the annulus, allowing them to separate at the surface. At the same time, the drilling fluid also cools and cleans the bit, reduces friction between the drill string and the sidewall of the hole, and maintains the stability of the uncased portion of the borehole. The drilling fluid also forms a filter that seals the openings made by the drill bit through the formation to reduce the influx of undesired formation fluids from permeable rock. Additionally, when drilling a subterranean well, formation solids are often dispersed in the drilling fluid. These formation solids usually include cuttings produced by the drill bit and solids produced by drilling instability. The presence of any of these formation solids in the drilling fluid can sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/06
CPCC09K8/035C09K8/06C09K2208/12
Inventor B·B·史密斯R·H·彼得内利亚J·布莱塞尔
Owner EVONIK OPERATIONS GMBH