Environment-friendly deep nano drainage agent for tight gas well and preparation method of environment-friendly deep nano drainage agent

An environmentally friendly, tight gas technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of large particle size variation, short drainage validity period, reservoir damage, etc., and it is easy to achieve process conditions. , The effect of reducing water lock damage and low surface interfacial tension

Inactive Publication Date: 2021-11-30
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of using water control agents in tight gas reservoirs, there are mainly the following problems: (1) The polymer water control system has a high viscosity, which is easy to cause damage to the reservoir; (2) The preparation process of the nanomaterial water control system is relatively complicated. And the particle size range is large, it is difficult to adapt to tight gas reservoirs; (3) Most of the research on polymer water control systems used in gas reservoirs focuses on the selective water shutoff of high permeability reservoirs, and the research on nanomaterial water control systems More focus on mine application, effectively guide the application of low permeability gas well water control mine, greatly increase the risk of field application
However, the following problems exist in the use of foaming agents in tight gas reservoirs: (1) liquid foaming agents need to be diluted with water, and will be attached to the well wall to cause unnecessary losses; (2) solid foaming agents are easy to (3) Insufficient gas source pressure of the gas well makes it difficult to generate foam and reduce drainage performance; (4) The foam itself is "oil-sensitive". After crude oil contacts the foam, it spreads or emulsifies in the gas-liquid and liquid film, Make the foam less stable
CN201010177121.5, CN201210047727.6, CN201310520122.9, CN201510206749.6, CN201410082682.5, CN201510321512.2, CN201510388070.3, CN201510683 No. 387 system, its stability is poor, the effective period of drainage is short, the effect is difficult to control, and the production fluid treatment is difficult and expensive

Method used

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  • Environment-friendly deep nano drainage agent for tight gas well and preparation method of environment-friendly deep nano drainage agent
  • Environment-friendly deep nano drainage agent for tight gas well and preparation method of environment-friendly deep nano drainage agent
  • Environment-friendly deep nano drainage agent for tight gas well and preparation method of environment-friendly deep nano drainage agent

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Experimental program
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Effect test

Embodiment 1

[0040] An environment-friendly deep nano-drainage agent for dense gas wells according to the present invention includes oil phase, emulsifier, co-emulsion agent, electrolyte and water; the components are as follows in terms of mass percentage: oil phase 15-30%, emulsifier 6-12% %, 3-7% of low-molecular-weight alcohols for emulsion aids, 0.3-1.2% for low-molecular-weight organic acids for emulsion aids, 4-12% for electrolytes, and the rest is water.

[0041] Further, the oil phase is amino polyether modified silicone oil which is a milky white solid with an ammonia value of 0.318-0.596 mmol / g.

[0042]Further, the polyether-modified silicone oil is amino-terminated polyether-modified amino silicone oil, side-chain polyether-modified amino silicone oil, end-side polyether-modified amino silicone oil or a mixture of both.

[0043] Further, the emulsifier is a nonionic surfactant selected from octylphenol polyoxyethylene ether (OP-15), fatty alcohol polyoxyethylene ether (AEO-15),...

Embodiment 2

[0064] At room temperature, put 20g of amino polyether modified silicone oil into a 500mL beaker, and add 8g of octylphenol polyoxyethylene ether (OP-15) and 6g of glycerol into the beaker, and stir at a low speed (500r / min) for 25min ; Then add 10g of distilled water in the total amount of water, continue to stir at 500r / min for 10min; add 0.6g of acetic acid emulsifier, continue to stir at 500r / min for 25min; finally add 6gNaCl and 70g of distilled water, continue to stir at 500r / min for 25min, room temperature Stand still for 60 minutes to get the environment-friendly nanoemulsion drainage agent.

[0065] For the particle size and Zeta potential of the environment-friendly nanoemulsion drainage agent, see figure 1 and figure 2 , the appearance of the environment-friendly nanoemulsion prepared under different conditions after draining and standing for 1d and 7d can be seen image 3 , biotoxicity test see Figure 4 , see Table 1 for biodegradability evaluation, see Figure...

Embodiment 3

[0073] At room temperature, put 20g of amino polyether modified silicone oil into a 500mL beaker, and add 10g of fatty alcohol polyoxyethylene ether (AEO-15) and 5g of ethylene glycol into the beaker, and stir at a low speed (500r / min) for 25min; Then add 10g of distilled water in total and continue to stir at 500r / min for 10min; add 0.7g of propionic acid emulsifier and continue to stir at 500r / min for 25min; finally add 4g of KCl and 70g of distilled water and continue to stir at 500r / min for 25min at room temperature Stand still for 60 minutes to get the environment-friendly nanoemulsion drainage agent.

[0074] The particle size distribution of the environment-friendly nanoemulsion drainage agent is shown in Figure 10, and the performance parameters are shown in Table 3.

[0075] Table 3 Statistical table of performance parameters of environment-friendly nanoemulsion drainage agent

[0076]

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Abstract

The invention relates to an environment-friendly deep nano drainage agent for a tight gas well. The environment-friendly deep nano drainage agent comprises an oil phase, an emulsifier, a co-emulsifier, an electrolyte and water; the agent comprises the following components in percentage by mass: 15-30% of an oil phase, 6-12% of an emulsifier, 3-7% of low-molecular alcohol of an auxiliary emulsion, 0.3-1.2% of low-molecular organic acid of the auxiliary emulsion, 4-12% of electrolyte and the balance of water, the average viscosity of the environment-friendly nano emulsion for water control and gas production ranges from 2.4 mPa.s to 3.2 mPa.s; the particle size is less than 30nm, and the median value of the particle size is 4.2-6.5 nm; the average surface tension is low and ranges from 21 mN / m to 34 mN / m; BOD5 / CODcr is greater than or equal to 29%, and EC50 is greater than 25000mg / L; the viscosity is low, the particle size is small and uniformly distributed, the performance is stable, biodegradation is easy, and biotoxicity is avoided; the agent can be suitable for water control and gas production of tight gas wells with complex gas / water relations.

Description

technical field [0001] The invention belongs to the technical field of profile control and water shutoff in tight gas reservoirs, and in particular relates to an environment-friendly deep nano drainage agent for tight gas wells and a preparation method thereof. Background technique [0002] Under the dual effects of the international low oil price situation and the strict domestic environmental protection policy, natural gas, as a clean and low-carbon fuel, can effectively improve the atmospheric environment; at the same time, as a high-quality chemical raw material, it plays an important role in the development of the national economy; for this reason, both at home and abroad Oil and gas workers have also intensified their research efforts on measures to enhance oil recovery in gas reservoirs. At present, for some water-producing gas wells, in order to increase the production of gas wells, the drainage gas recovery method and water control gas recovery technology are usuall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588
CPCC09K8/584C09K8/588
Inventor 秦国伟王香增梁全胜郑俨钊张蓓蕾孙赛赛刘青萍
Owner XI'AN PETROLEUM UNIVERSITY
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