Water-injection protection agent for oil and gas reservoir of oil field, and preparation method and application method thereof

A protective agent, a technology for oil and gas layers, applied in chemical instruments and methods, earth-moving drilling, mechanical equipment, etc., can solve the problems of water injection failing to meet the allocation and injection requirements, increasing development costs, and affecting oil and gas production.

Inactive Publication Date: 2019-05-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the water injection process, since the foreign well fluid (injected water) enters the oil and gas layer, it must contact the rocks and fluids in the oil and gas layer, and various damages will occur. The result of the damage is that the water injection pressure will increase or the water injection will not reach the distribution Requirements, affecting oil and gas production, reducing water injection benefits and increasing development costs

Method used

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  • Water-injection protection agent for oil and gas reservoir of oil field, and preparation method and application method thereof
  • Water-injection protection agent for oil and gas reservoir of oil field, and preparation method and application method thereof
  • Water-injection protection agent for oil and gas reservoir of oil field, and preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a water injection protection agent for oil and gas formations for oilfields, which includes water, triethanolamine gluconate, 1,1-ethylenediphosphonic acid diethylhydroxylamine sulfate, and a bactericide, with the mass of each substance per liter of water In total, 40 g of triethanolamine gluconate, 80 g of 1,1-ethylene diphosphonic acid diethylhydroxylamine sulfate, and 120 g of bactericide. The bactericide is tetradecyl tributyl phosphonium chloride.

[0036] Preparation process: Step 1) Preparation of organic carboxylate: according to the weight ratio of gluconic acid: triethanolamine=1.31:1.00, under stirring conditions, slowly add powdered gluconic acid to the slurry of triethanolamine, and stir evenly to obtain Gluconic acid triethanolamine organic carboxylate;

[0037] Step 2) Preparation of organic sulfate: Under stirring conditions, slowly add diethylhydroxylamine to the 1,1-ethylenediphosphonic acid sulfuric acid aqueous solution (40%, w / w...

Embodiment 2

[0040] This embodiment provides a water injection protection agent for oil and gas formations for oilfields, which includes water, triethanolamine gluconate, 1,1-ethylenediphosphonic acid diethylhydroxylamine sulfate, and a bactericide, with the mass of each substance per liter of water In total, 60 g of triethanolamine gluconate, 120 g of 1,1-ethylenediphosphonic acid diethylhydroxylamine sulfate, and 180 g of bactericide. The bactericide is tetradecyl tributyl phosphonium chloride.

[0041] The preparation process is the same as in Example 1.

[0042] The clean water injection water used in Example 1 and Example 2 is long 8 The formation water is injected into the water, and its chemical composition and comprehensive water quality are shown in Table 1 and Table 2, respectively.

[0043] Table 1 Length 8 The water chemical composition of the formation water injected into the water

[0044]

[0045] Table 2 Length 8 Comprehensive water quality of ground water injected water

[0046] ...

Embodiment 3

[0079] This embodiment provides a water injection protection agent for oil and gas formations for oilfields, which includes water, triethanolamine gluconate, 1,1-ethylenediphosphonic acid diethylhydroxylamine sulfate, and a bactericide, with the mass of each substance per liter of water In total, 40 g of triethanolamine gluconate, 80 g of 1,1-ethylene diphosphonic acid diethylhydroxylamine sulfate, and 120 g of bactericide. Among them, the bactericide is a mixture of tetradecyl tributyl phosphonium chloride and organic aldehyde. Based on the mass of each substance per liter of water, the tetradecyl tributyl phosphonium chloride is 80 g and the organic aldehyde is 40 g.

[0080] Preparation process: Step 1) and Step 2) are the same as in Example 1;

[0081] Step 3) First add 400 liters of oilfield stratum sewage into the enamel reactor with a volume of 1000 liters, then add 40Kg of acrolein into the water, stir evenly, and then add 60Kg of triethanolamine gluconate and quaternary ph...

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Abstract

The invention provides a water-injection protection agent for an oil and gas reservoir of an oil field, and a preparation method and an application method thereof. The water-injection protection agentcomprises water, triethanolamine gluconate, 1,1-ethylidene diphosphonate diethylhydroxylamine sulfate and a bactericide, wherein the masses of all substances in each litre of the water are as follows: 40 to 60 g of the triethanolamine gluconate, 80 to 120 g of the 1,1-ethylidene diphosphonate diethylhydroxylamine sulfate and 120 to 180 g of the bactericide. The multifunctional water-injection protection agent provided by the invention integrates the functions of sterilization, oxygen removal, removal of hydrogen sulfide (sewage), corrosion inhibition, scale inhibition / dispersion, clay stabilization (expansion prevention, dispersion prevention and migration prevention), Fe<3+> stabilization, demulsification and oil-water interfacial tension reduction into a whole, is applicable to water-injection protection of the oil and gas reservoir in the process of water injection development and to corrosion-prevention protection of the pipeline of a water injection system in the process of waterinjection for sandstone formation, and is also applicable to sterilization, corrosion prevention and scale prevention protection for oil production wellbores, oil production gathering pipelines, oil-water separation settling tanks and clear water / sewage storage and collection tanks.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas layer protection, and specifically relates to an oil and gas layer water injection protective agent for oil fields, and a preparation method and a use method. Background technique [0002] In the whole process of drilling, completion, downhole operations, and oil and gas field exploitation, there is a phenomenon of oil and gas layer damage. The essence of oil and gas layer damage is the decrease of oil and gas layer permeability. Oil and gas layer damage directly affects oil and gas production, increases development costs, and reduces oil field development benefits. Therefore, protecting oil and gas layers is an inevitable requirement in the process of oil and gas field exploration and development. [0003] Starting from the drilling, completion, downhole operations and oil and gas field exploitation in the process of oilfield exploration and development, oil and gas layer protection technology mainl...

Claims

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Application Information

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IPC IPC(8): C09K8/035F17D1/08E21B43/20E21B43/22E21B41/02
Inventor 吕小玲武平仓杨娟李欢张晓斌
Owner PETROCHINA CO LTD
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