Device and method for evaluating saturation capacity of moveable oil in shale

Abstract

The invention discloses a device for evaluating saturation capacity of moveable oil in shale. The device comprises an airtight sample tank, a sample tank cover, a first graduated tube, a second graduated tube, a vacuum pump, a four-way valve, a communicating port, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a first stop valve, a second stop valve, a third stop valve and a fourth stop valve, wherein the sample tank cover is arranged above the airtight sample tank; the communicating port is formed in the sample tank cover; one end of the first pipeline is communicated with the airtight sample tank while the other end is communicated with the four-way valve; the first stop valve is arranged on the first pipeline; the first graduated tube is connected with the four-way valve through the second pipeline; the second stop valve is arranged on the second pipeline; the second graduated tube is connected with the four-way valve through the third pipeline; the third stop valve is arranged on the third pipeline; the vacuum pump is connected with the four-way valve through the fourth pipeline; the fourth stop valve is arranged on the fourth pipeline. The broken sample is used by the device; the efficiency is increased; the two graduated tubes are used for respectively injecting KCl solution and alkane; the pollution in an experimental process is reduced; the result is accurate.

Description

technical field [0001] The invention relates to the field of petroleum engineering and technology, in particular to a device and method for evaluating the saturation of movable oil in shale. Background technique [0002] With the in-depth study of shale gas theory and the rapid development of exploration and development, shale oil has also received extensive attention and high attention in recent years. As a sibling of shale gas, shale oil also has a relatively wide distribution. In the United States, shale oil production has increased rapidly since 2005, reaching 29.73 million tons in 2011, which has become the focus of unconventional oil and gas exploration and development. In addition, Canada and other countries have also made breakthroughs in shale oil exploration and development to varying degrees. [0003] my country is rich in shale oil resources. Since the 1960s, "shale fractured reservoirs" have been discovered in different oil and gas-bearing basins. With the de...

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Problems solved by technology

Only after clarifying the content of crude oil in the shale in the free state, adsorption and dissolved state, can the development plan be established in a targeted manner. The current patent reports or documents are all focused on the characterization of the total porosity and organic porosity of shale. The existence of pores in shale provides a place for oil storage, but it can only represent the possible amount of oil reserves in shale, not the movable oil or developable oil reserves, which is more important for the design and selection of development plans The guiding significance is the reserves of movable oil in different occurrence states, but there is no literature or patent report related technology or method to quantify the movable oil in shale in free state and adsorption and dissolution state representation of

The prior art also provides a method for quantitatively controlling the amount of movable oil in the oil-water imbibition process of the rock block. This method quantitatively controls the oil-water content in the rock block through oil-water two-phase imbibition to obtain a certain oil-water distribution. Due to the use of finite vacuum saturation technology for cores, the existence of gas phases will occupy a certain space, so the measured oil and water content is much smaller than the saturation of rock blocks. This method cannot determine the oil and water content of the same core if it flows into water and oil successively. The amount of water when the core is fully saturated

In addition, since shale contains a large amount of clay, the injection of water will cause the clay to absorb water and expand, and the pores will change, thereby affecting the saturation of oil and water.

Therefore, this technique is also unable to quantitatively characterize the movable oil in shale, especially the movable oil existing in the free state and adsorption-dissolved state

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