Neutral plug removal treating 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: 2018-06-01
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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  • Neutral plug removal treating agent and preparation method thereof
  • Neutral plug removal treating agent and preparation method thereof
  • Neutral plug removal treating agent and preparation method thereof

Examples

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Effect test

Embodiment 1

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

[0027] Preparation method: add the formula amount of water to the reaction kettle, and heat it up to 50-55 ° C, then add the formula amount of scale remover, synergist, dispersant, regulator, and cosolvent into the reaction kettle in turn, each time adding One component is stirred for 15-20 minutes to make it fully mixed, and after all components are added, the mixture is stirred for 25-35 minutes, and cooled to room temperature to obtain a neutral blocking removal treatment agent.

[0028] The neutral plugging removal treatment agent provided in this embodiment has no acidic substances added or generated in the whole process, and can remove the wax, colloid and asphaltene covered on the surface...

Embodiment 2

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

[0031] See Example 1 for the preparation method. In this embodiment, the scale remover is composed of the following substances in the mass percentage of the neutral blockage removal treatment agent: 1% dipotassium ethylenediaminetetraacetate, 2% dipotassium cyclohexanediaminetetraacetate, glutamic acid-N , N-dipotassium diacetate 7%; the synergist is composed of the following substances which account for the mass percentage of the neutral plugging treatment agent: 0.25% of tetrasodium iminodisuccinate, 0.25% of 15-crown-5; dispersant It is composed of the following substances which account for the mass percentage of the neutral blockage removing agent: citric acid fatty acid glyceride 0....

Embodiment 3

[0033] On the basis of Example 1, this example provides a neutral blockage removal treatment agent, which is composed of the following components by mass percentage: 8% of a descaling agent, 1% of a synergist, 1% of a dispersant, and 1% of a regulator. 1%, co-solvent 8%, the rest is water.

[0034] See Example 1 for the preparation method. In this embodiment, the scale remover is composed of the following substances, which account for the mass percentage of the neutral blocking removing agent: 1% dipotassium cyclohexanediaminetetraacetate, 6% dipotassium glutamic acid-N,N-diacetate, 1,4,7,10-tetraazacyclododecane-1,4,7,10-dipotassium tetraacetate 1%; the synergist is composed of the following substances in the mass percentage of the neutral blocking removal treatment agent: acrylic acid - 0.5% of 2-acrylamide-2-methacrylic acid multipolymer, 0.5% of 15-crown-5; the dispersant is composed of the following substances in the mass percentage of the neutral blocking removal treatm...

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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, and high starting pressure gradient, and the reservoir is prone to blockage. During the perforation process, the crude oil near the hole will be precipitated with the temperature and pressure drop, and the wax, colloid, and asphaltene will be precipitated, and they will be deposited at the drainage site to block the oil layer or the hole. During the production process, the oil and water form organic and inorganic scales due to changes in temperature and pressure conditions, and the water lock, emulsification, wetting reversal, and particle migration formed by external fluids on the oil layer lead to blocka...

Claims

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Application Information

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Patent Type & Authority Applications(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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