Journal of magnetic resonance. Series B

A dynamic model of CO2 diffusion coefficient in shale based on the whole process fitting

The invention provides an efficient and low-consumption method for exploiting natural gas hydrate of a sea bed and belongs to the field of energy and environment. According to the method, rich wave energy and solar energy in an ocean area are used for power generation, meanwhile, seawater is desalted by the aid of the solar energy, produced strong brine is used for exploiting natural gas hydrate of the sea bed while freshwater is obtained, and the method is a joint production method for sea water desalination through solar energy resources and sea bed hydrate exploitation. The sun rises in daytime and sets at night, so that continuous operation of exploitation is realized in the manner of injection of strong brine in the daytime and injection of seawater at night. An offshore floating production platform, a solar-powered seawater desalination system and a sea bed hydrate exploitation system are mainly involved in the method. The whole joint production process can be spontaneously induced by the aid of rich ocean wave energy and renewable solar energy resources, the process is simple, the energy consumption is low, the economic and environmental benefits are remarkable, and the method can be lastingly applied to joint production of large-scale seawater desalination and sea bed hydrate exploitation.

Efficient and low-consumption method for exploiting natural gas hydrate of sea bed

The invention discloses a natural gas hydrate parallel horizontal well miscible-phase displacement mining method and belongs to the technical field of natural gas hydrate mining. The method includes the steps that in combination with geological data, a parallel horizontal well network is arranged for a target reservoir; matched well-completion operation is performed; after well completion is finished, depressurizing mining is performed through horizontal wells till no economic benefit exists; after depressurizing mining is finished, fracturing operation is performed on the horizontal wells; then a ground supply system and an underground injection system are arranged at the injection wells; and carbon dioxide and chemical agents are separately injected into the natural gas hydrate reservoirthrough the injection wells, and natural gas and produced water are collected from the producing wells. The natural gas hydrate parallel horizontal well miscible-phase displacement mining method is suitable for the reservoir which is low in permeability, poor in communication property, rich in storage and low in natural gas hydrate saturability; the horizontal wells distributed in parallel are arranged for the target reservoir so that the storage amount of the available natural gas hydrate can be increased; and mining is performed by separately injecting the carbon dioxide and the chemical agents through the injection wells, the gas mining efficiency can be improved, the ultimate recovery factor is improved, and the economic benefits are improved.

Natural gas hydrate parallel horizontal well miscible-phase displacement mining method

The invention belongs to the technical field of marine natural gas hydrate exploitation, and relates to a method for exploiting marine natural gas hydratethrough a water current erosion method. By controlling the pressure gradient of an exploiting well and a reservoir around the exploiting well, flowing of sea water inside the reservoir is further controlled, based on the characteristic that the permeabilityaround the exploiting well is high, the hydrate is gradually, stably and efficiently decomposed, it is guaranteed that the hydrate is completely exploited, and through the displacement effect of the water flowing process, exploited natural gas is efficiently collected. The stable and efficient exploitation process also guarantees the stable existence of the reservoir, and reservoir structure damage caused by large pressure drop and serious natural disasters caused by geological damage are eliminated. The method is easy to implement, and large-scale commercialized exploitation of thehydrate is easily achieved.

Method for exploiting marinenatural gas hydrate through water current erosion method

The invention discloses a natural gas hydrate CO2 substitution extraction method combined with depressurization. The method includes: using alow-density mud drilling technology to depressurize natural gas hydrate reservoir so as to decompose part of the natural gas hydrate; using heterogeneous alcohol ethoxylate as an emulsifier and liquid CO2 as dispersion phase water and a continuous medium to prepare a CO2 emulsifier in a high-pressure container with controlled pressure and temperature; drilling a CO2 emulsifier filling passage, and filling the CO2 and a water emulsifier into a natural gas hydrate reservoir through an emulsifier filling opening; controlling reservoir pressure through the emulsifier filling opening to be in the CO2 hydrate phase balance pressure range corresponding to the reservoir temperature so as to promote the reaction of the CO2 and the natural gas hydrate, and generating CO2 hydrate and gaseous CH4. By the method, CO2 emission reduction is achieved, extraction safety is increased, reservoir seepage characteristics can be improved effectively, the emulsifier is prompted to seep into the reservoir, and the efficiency of the CO2 substitution extraction method is increased.

Natural gas hydrate CO2 substitution extraction method combined with depressurization

The invention disclosesa method for distinguishing an aquo-complex phase from a water phase through CT scanning, and belongs to the technical field of chemical engineering and petrol engineering. The method for distinguishing the aquo-complex phase from the water phase with the CT technology includes the steps that gray level distribution generated before an aquo-complex is generated in a container is obtained with the imaging technology, gray level distribution generated after the aquo-complex is generated in the container is obtained, the area of the generated aquo-complex is obtained, and therefore the aquo-complex phase and the water phase are distinguished; finally, the decomposition process of the aquo-complex is quantitatively obtained through a formula. By means of the method, the area of the generated aquo-complex can be accurately determined, the position of the aquo-complex and the position of water are visibly determined accordingly, and the distinguishing effect is quite good accordingly; in addition, changes of the saturation degree in the decomposition process of the aquo-complex are calculated, and therefore the decomposition process of the aquo-complex is quantitatively analyzed.

Method for distinguishing aquo-complex phase from water phase through CT scanning

In the recent years, using CO2 injection into oil reservoirs to enhanced oil recovery (CO2-EOR) has attracted more and more attention from industry and laboratory experiment. The mass transfer and diffusion of CO2 in oil is one of the key parameters of displacement process. In this study, by employing nuclear magnetic resonance (NMR) and a nonlinear fitting equation, the effective diffusion coefficient is calculated quantitatively. It proved that the experimental apparatus and mathematical procedure employed in this study were reliable to investigate and calculate the diffusion coefficient. Three main conclusions were obtained from this study: (i) the effective diffusion coefficient increases as the initial pressure increases; (ii) the relationship between CO2 diffusion coefficient and pressure is nonlinear;(iii) the temperature effect on diffusion of CO2 in oil is obvious because of the reduction in oil viscosity.

/pdf/experimental-measurement-of-co2-diffusion-coefficient-in-tqv294en4q.pdf

Experimental Measurement of CO2 Diffusion Coefficient in Porous Media Using NMR Micro-Imaging

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Natural gas hydrate CO2 substitution extraction method combined with depressurization

Method for distinguishing aquo-complex phase from water phase through CT scanning

Experimental Measurement of CO2 Diffusion Coefficient in Porous Media Using NMR Micro-Imaging