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A kind of neutral plug-removing treatment agent and preparation method thereof

A treatment agent and plugging removal technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of single object of plugging removal, inorganic scale cannot be removed, and removal efficiency, so as to achieve long penetration distance and prevent water source enrichment Nutritization, high chelation stability coefficient effect

Active Publication Date: 2021-03-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main problem of the antiscalants represented by the above-mentioned patent documents is that the improved acid solution plugging removal method still contains acid liquid and other components, which cannot avoid the formation of secondary precipitation and column corrosion; the non-acid plugging removal method has the problem of plugging removal The target is single, and the inorganic scale cannot be removed or the removal efficiency is low.

Method used

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  • A kind of neutral plug-removing treatment agent and preparation method thereof
  • A kind of neutral plug-removing treatment agent and preparation method thereof
  • A kind of neutral plug-removing treatment agent and preparation method thereof

Examples

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Embodiment 1

[0026] This embodiment provides a neutral plugging removal treatment agent, which consists of the following components in mass percentage: 5-12% scale remover, 0.5-1% synergist, 0.5-2% dispersant, and 0.5-2% regulator 2%, co-solvent 5-10%, and the rest is water.

[0027] Preparation method: Add the formulated amount of water into the reactor, and raise the temperature to 50-55°C, then add the formulated amount of descaling agent, synergist, dispersant, regulator, and co-solvent into the reactor in sequence, and add each One component was stirred for 15-20 minutes to make it fully mixed, after adding all the components, stirred for 25-35 minutes, and cooled to room temperature to obtain a neutral block-removing treatment agent.

[0028] The neutral plugging removal treatment agent provided in this example does not add or generate acidic substances throughout the process, and can remove wax, colloid, and asphaltenes covered on the surface of sediments under neutral low temperatu...

Embodiment 2

[0030] On the basis of Example 1, this example provides a neutral plugging removal treatment agent, which consists of the following components in mass percentage: 10% scale remover, 0.5% synergist, 1% dispersant, regulator 1%, co-solvent 10%, and the rest is water.

[0031] See Example 1 for the preparation method. In this embodiment, the descaling agent is composed of the following substances accounting for the mass percentage of the neutral plugging removal treatment agent: 1% dipotassium ethylenediaminetetraacetic acid, 2% dipotassium cyclohexanediaminetetraacetic acid, glutamic acid-N , N-dipotassium diacetate 7%; the synergist is composed of the following substances accounting for the mass percentage of the neutral plugging treatment agent: tetrasodium iminodisuccinate 0.25%, 15-crown-5 0.25%; dispersant It is composed of the following substances accounting for the mass percentage of neutral plugging treatment agent: citric acid fatty acid glyceride 0.5%, cocamidopropyl ...

Embodiment 3

[0033] On the basis of Example 1, this example provides a neutral plugging treatment agent, which consists of the following components in mass percentage: 8% scale remover, 1% synergist, 1% dispersant, regulator 1%, co-solvent 8%, and the rest is water.

[0034] See Example 1 for the preparation method. In this embodiment, the descaling agent is composed of the following substances in the mass percentage of the neutral plugging removal treatment agent: 1% dipotassium cyclohexanediamine tetraacetate, 6% dipotassium glutamic acid-N,N-diacetate, Dipotassium 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetate 1%; the synergist is composed of the following substances in the mass percentage of the neutral plugging treatment agent: acrylic acid - 0.5% of 2-acrylamide-2-methylpropanesulfonic acid multi-polymer copolymer, 0.5% of 15-crown ether-5; the dispersant is composed of the following substances accounting for the mass percentage of the neutral plugging treatment agent: cocamid...

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Abstract

The invention provides a neutral plug removal treating agent and a preparation method thereof. The neutral plug removal treating agent comprises the following components in percent by mass: 5 to 12 percent of an antiscaling agent, 0.5 to 1 percent of a synergist, 0.5 to 2 percent of a dispersing agent, 0.5 to 2 percent of a regulator, 5 to 10 percent of a cosolvent, and the balance of water. The neutral plug removal treating agent has the advantages that acidic materials are not added or produced during the whole process, wax, colloid and asphaltene covering the surface of sediments can be removed under a neutral low-temperature condition, and the neutral plug removal treating agent is neutral, non irritant, low-corrosion, low in transportation risk, and mild in plug removal reaction, effectively removes indissolvable inorganic scales, such as sulfate and carbonate, and achieves the purposes of elimination of transportation operation risk, reducing of tubular column corrosion rate, protection of a reservoir framework structure and improvement of the success rate of measures.

Description

technical field [0001] The invention belongs to the technical field of gas field development, and in particular relates to a neutral plug-removing treatment agent and a preparation method thereof. Background technique [0002] Changqing Oilfield is a low-permeability oilfield with poor reservoir physical properties, low porosity and permeability, low formation temperature, high starting pressure gradient, and easy reservoir plugging. During the perforation process, the crude oil near the perforation will precipitate wax, colloid, and asphaltenes as the temperature and pressure drop, and deposit at the oil drainage site to block the oil layer or perforation. During the production process, oil and water will form organic and inorganic scales under the change of temperature and pressure conditions, and the water lock, emulsification, wetting reversal and particle migration formed by external fluids on the oil layer will lead to blockage. At the same time, low-permeability oil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524C09K8/528
CPCC09K8/524C09K8/528
Inventor 万向辉蒋文学李勇吴增智李志航汪小宇金娜王坤马托王玉功王所良李雪李珊尹虎琛
Owner BC P INC CHINA NAT PETROLEUM CORP
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