High-temperature and high-pressure physical simulation experiment method for depletion development of low-permeability water-invaded gas reservoirs
A depletion development, high temperature and high pressure technology, applied in the direction of mining fluids, earth drilling, material inspection products, etc., can solve the problems that cannot meet the ultra-high pressure displacement depletion experiments of water-invaded gas reservoirs in low-permeability areas, and achieve the elimination of rock compression effect Effects with Stress Sensitive Effects
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Embodiment 1
[0041] Such as figure 1The shown high-temperature and high-pressure physical simulation experiment device for the depletion development of low-permeability water-invaded gas reservoirs includes a core holder 6, and also includes a displacement pump 1, a three-way valve 2, and a back pressure valve 5. The displacement pump 1 and the three-way A gas intermediate container 3 and a water body intermediate container 4 are connected in parallel between one interface of the valve 2; the other two interfaces of the three-way valve 2 are respectively connected with the vacuum pump 7 and the rock core holder 6, and the other two ports of the rock core holder 6 One end is connected to the back pressure valve 5; it also includes confining pressure pipes 8 connected in parallel at both ends of the core holder 6, and back pressure pipes 9 connected with the back pressure valve 5.
[0042] Preferably, the confining pressure pipe 8 is connected to the side of the back pressure valve 5 close t...
Embodiment 2
[0044] This example is based on the experimental device as in Example 1, using actual reservoir cores, under the conditions of normal temperature and confining pressure of 126 MPa, the full-diameter core depletion recovery experiment of the reservoir cores is carried out.
[0045] 1. Experimental conditions
[0046] 1. Experimental temperature: room temperature (20°C);
[0047] 2. Experimental pressure: the confining pressure simulates the overburden pressure of 126MPa, the back pressure simulates the formation pressure from 76MPa to 5MPa (abandoned pressure), and the internal pressure point is selected to change by 2MPa;
[0048] 3. Experimental gas: N 2 ;
[0049] 4. Experimental formation water: Prepare the experimental formation water according to Table 1.
[0050] Table 1 Formation water composition and content table used in experiments
[0051] Bicarbonate mg / L Chloride ionmg / L Sulfate mg / L Calcium ion mg / L Magnesium ion mg / L 24.97 9817.22 97....
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