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Active oil-washing sand consolidating agent and preparation method and application thereof

A sand-fixing agent and oil-washing technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as residues in the well, high workover costs, and influence on later operations, so as to achieve excellent operability and not easy Defects, the effect of guaranteed strength

Inactive Publication Date: 2017-04-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of formation sand consolidation under the condition of low temperature, medium and low salinity and water content, and to overcome the problems of mechanical sand control after mechanical sand control operation, there are residues in the well, which will affect the later operation, and at the same time, the cost of workover is high. Start, research and develop new chemical sand control agents adapted to reservoir conditions

Method used

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  • Active oil-washing sand consolidating agent and preparation method and application thereof
  • Active oil-washing sand consolidating agent and preparation method and application thereof
  • Active oil-washing sand consolidating agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to m (oil): m (sand) = 1: 4, accurately weigh the clean sand (m sand) and crude oil (m oil) in the oil field, mix them thoroughly, put them in an oven, and age them at the reservoir temperature for 4 days, stirring frequently in the middle Ensure that the oil content is uniform throughout the oil sands. The oil content of the oil sand is m oil / (m sand+m oil).

[0036] Take a certain amount of modified epoxy resin emulsion, curing agent and silane coupling agent KH550 or KH570 and stir evenly, then add an appropriate amount of oil-containing quartz sand (particle size 0.4-0.8mm), stir well, put it into one end and plug it tightly with a rubber stopper Shake well and compact, then moisten with water or emulsion, soak in a constant temperature water bath at 60°C-70°C for 72h-96h, break the glass tube, take out the consolidated body, and use a core cutter Cut the consolidated body into 2.5cm long cores for testing the compressive strength.

[0037] The consolida...

experiment example 2

[0039] The viscosity of the crude oil in the heavy oil block of the No. 1 Oil Production Plant of an oilfield is 25-90pa.s (30℃), and it contains 15% asphaltenes. The oil layer has high sand content and severe sand production. At present, the average daily production of oil well sand is more than 100 square meters, and the average oil content is 20% to 30%. The production time of steam huff and puff is longer, and the effect of steam injection and oil production decrease obviously. The study of the oil washing and sand fixing system in the field shows that the system can effectively stabilize the formation, and have a higher permeability, remove the clogging of the oil layer, and increase the productivity of the oil well. The oil washing and sand-fixing agent sand-fixing operation of 19 wells within the oil production cycle can extend the oil production cycle by 283 days, increase the cumulative production by 573 tons, greatly reduce the sand production, and have a long effec...

Embodiment 3

[0041] A certain oilfield was put into development in 1995. It is a complex fault-block reservoir of unconsolidated sandstone. Due to the shallow burial of oil layers, loose intertwining and serious sand production. Sand production and clogging are the main problems encountered in the development of this oilfield. Of the 18 wells put into production in a certain block of the oilfield at the initial stage, 10 wells failed to produce normally due to sand production and clogging. The results of the implementation of the sand-fixing system show that: 8 well-times were applied to the measure wells, 6 well-times were successful, the success rate was 75%, and the effective period of sand control reached more than 500 days. The average single well daily fluid of sand-controlling oil wells is 8.4, daily oil is 1.4, and water cut is 70%. Among them, Well Qu 104 Xie Geng 2 had a daily fluid flow of 20 cubic meters, a daily oil production of 10 tons, and a cumulative production increase o...

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Abstract

The invention relates to an active oil-washing sand consolidating agent. The active oil-washing sand consolidating agent is prepared from the following components in percentage by weight: 20 percent to 30 percent of epoxy resin, 5 percent to 15 percent of methacrylic acid, 5 percent to 15 percent of octadecyl methacrylate, 10 percent to 30 percent of ethylene glycol monobutylether, 10 percent to 20 percent of n-butanol, 10 percent to 20 percent of dimethylethanolamine, 5 percent to 7 percent of benzoyl peroxide and 10 percent to 15 percent of de-ionized water. A mixed solution of the n-butanol and the ethylene glycol monobutylether is used for pre-dissolving the epoxy resin, and the octadecyl methacrylate and the methacrylic acid are grafted onto the epoxy resin under the initiation of the benzoyl peroxide; a proper amount of the dimethylethanolamine and the de-ionized water are added to regulate the pH (Potential of Hydrogen), so as to obtain the active oil-washing sand consolidating agent. The active sand consolidating agent provided by the invention can be rapidly cured at a temperature lower than 60 DEG C, and a coupling agent can also be used for enhancing the cohesive property of the resin and a surface of a sandstone, so that the strength of a resin consolidated matter is guaranteed; meanwhile, the active sand consolidating agent has an extremely high oil-absorption capability and the permeability of the consolidated sandstone is kept, so that a stratum structure is stabilized or an artificial borehole wall with certain strength and permeability is formed.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a new type of resin liquid sand-fixing agent capable of cementing the loose sandstone near the well wall under the condition of low temperature, medium-low salinity and water content during the oilfield exploitation process. During the production of sand-producing oil wells, the formation sand of loose sandstone or the gravel filled in the formation is cemented, thereby stabilizing the formation structure or forming an artificial well wall with a certain strength and permeability, and achieving the purpose of preventing formation sand production. Background technique [0002] With the deepening of reservoir development in each block of the oilfield, during the production process of the oilfield, due to the damage to the sandstone of the oil well due to construction operations or the loose cementation of the sandstone itself, the original pressure system of the formati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/575
CPCC09K8/5751
Inventor 侯影飞孟新迪齐升东游海鹏许杨张瑶瑶牛青山
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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