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Solid chelate acid for augmented injection of water injection wells and preparation method thereof

A technology of chelating acid and water injection wells, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., which can solve the problems of increasing oilfield development costs, small plugging removal radius, and sand production near the wellbore, so as to overcome the phenomenon of excessive dissolution , expanding the radius of plugging removal, and the effect of small self-corrosion

Active Publication Date: 2018-12-18
SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a solid chelating acid for water injection well injection and its preparation method. The present invention overcomes the safety and environmental protection problems of conventional acid liquid in the process of transportation, storage and use, and simultaneously solves the problem of acid liquid existing in conventional acidification. Fast reaction rate, small plugging removal radius, excessive dissolution near the wellbore, severe sand production near the wellbore after measures, and short validity period of the measure wells, resulting in frequent measures for water injection wells and increased oilfield development costs

Method used

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  • Solid chelate acid for augmented injection of water injection wells and preparation method thereof
  • Solid chelate acid for augmented injection of water injection wells and preparation method thereof

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Effect test

Embodiment 1

[0033] The invention discloses a solid chelating acid for increasing injection of water injection wells, which is composed of the following raw materials in weight percentage: 30-40% of the main agent, 20-30% of the auxiliary agent, and 10-30% of the reinforcing agent 15%, active agent 3-8%, inhibitor 2-3%, stabilizer 5-10% and binder 15-30%.

[0034] The solid chelating acid for increasing injection of water injection wells is prepared by heating and kneading in the art.

[0035] The concrete steps of this a kind of preparation method for the solid chelating acid of water injection well injection increase are as follows:

[0036] Step 1) Prepare the raw materials, and take the raw materials of the solid chelating acid used for water injection well injection according to the formula quantity:

[0037] The main agent is 30-40%, the auxiliary agent is 20-30%, the enhancer is 10-15%, the active agent is 3-8%, the inhibitor is 2-3%, the stabilizer is 5-10% and the adhesive The d...

Embodiment 2

[0044] On the basis of Example 1, the main agent is composed of one or both of hydrazine hydrochloride and hydrazine dihydrochloride, sulfamic acid, hydroxyethylene diphosphonic acid, and the weight percentage is 30-40% of the main agent. In the agent: 10-15% by weight of one or both of hydrazine hydrochloride and hydrazine dihydrochloride, 10-12% by weight of sulfamic acid, and 10-13% by weight of hydroxyethylene diphosphonic acid %, wherein the mass percent content of hydroxyethylene diphosphonic acid is 90%. The adjuvant is composed of urea nitrate and urea phosphate, and in the adjuvant with a weight percentage of 20-30%, the weight percentage of urea nitrate is 15-20%, and the weight percentage of urea phosphate is 5-10%. The reinforcing agent is composed of ammonium bifluoride and ammonium fluoroborate, and in the reinforcing agent with a weight percentage of 10-15%, the weight percentage of ammonium bifluoride is 5-7%, and the weight percentage of ammonium fluoroborate ...

Embodiment 3

[0046] A kind of concrete steps of the preparation method of the solid chelating acid that is used for water injection well injection enhancement are as follows:

[0047] Step 1) Prepare the raw materials, and take the raw materials of the solid chelating acid used for water injection well injection according to the formula quantity:

[0048] The main agent is 30-40%, the auxiliary agent is 20-30%, the enhancer is 10-15%, the active agent is 3-8%, the inhibitor is 2-3%, the stabilizer is 5-10% and the adhesive The main agent is 15-30%; the main agent is composed of one or both of hydrazine hydrochloride and hydrazine dihydrochloride, sulfamic acid, hydroxyethylene diphosphonic acid, and the weight percentage is 30-40% of the main agent Middle: 10-15% by weight of one or both of hydrazine hydrochloride and hydrazine dihydrochloride, 10-12% by weight of sulfamic acid, and 10-13% by weight of hydroxyethylene diphosphonic acid ; Described adjuvant is made up of urea nitrate and u...

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Abstract

The invention discloses a solid chelate acid for the augmented injection of water injection wells and a preparation method thereof, which relate to the technical field of depressurization and augmented injection of water injection wells of oilfields. The solid chelate acid for the augmented injection of water injection wells consists ofis prepared from the following materials in percentage by weight: 30 to 40 percent of a main agent, 20 to 30 percent of an auxiliary agent, 10 to 15 percent of an intensifier, 3 to 8 percent of an activator, 2 to 3 percent of an inhibitor, 5 to 10 percent of a stabilizer and 15 to 30 percent of a binder. By adopting the invention, potential safety and environmental hazards in the process of transportation, storage and use in plugging removal by acidification, the slow release rate of acid liquor is greatly increased, the radius of plugging removal is broadened, plugging removal deep in a water injection well is benefittedfacilitated, and the effective rate of depressurization and augmented injection measures for water injection wells is increased.

Description

technical field [0001] The invention relates to a solid chelating acid, in particular to a solid chelating acid used for increasing injection of water injection wells and a preparation method thereof. The invention belongs to the technical field of reducing pressure and increasing injection of water injection wells in oil fields. Background technique [0002] With the extension of oilfield development time, due to the reduction of formation energy, the production of oil wells decreases, and water injection development is required to maintain formation energy. In the water injection development, due to the clogging of mechanical impurities, scaling and bacterial corrosion products in the injected water, the water injection wells show high pressure under-injection. Water injection wells need to be deblocked. Currently, the commonly used deblocking agents are composed of acid liquid. Acid liquid is a dangerous chemical. During the transportation, storage and use of acid liquid...

Claims

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Application Information

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IPC IPC(8): C09K8/528C09K8/52
CPCC09K8/52C09K8/528
Inventor 陈柯全李刚
Owner SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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