Evaluation device for damage to reservoir permeability caused by well-entry fluid
A technology for evaluating devices and permeability, which is applied in the fields of permeability/surface area analysis, measuring devices, suspension and porous material analysis, etc., which can solve the problem of difficult to obtain results, limit the protection of reservoir well fluid research, and it is difficult to accurately describe the real Permeability properties etc.
Active Publication Date: 2016-09-07
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
It is difficult to use the same method to evaluate rocks with a wide range of permeability changes. At the same time, different types of rocks have different degrees of physical and chemical reactions after contact with well fluids. Sometimes the permeability changes exceed the boundary conditions of a certain test method, which limits Study on Protecting Reservoir Drilling Fluid
[0004] At present, the permeability test methods are divided into steady-state method and unsteady-state method. The accuracy of the test data of the non-steady-state method needs to be further explored because the test method does not or does not completely pass through the core.
The existing conventional Darcy's law core permeability tester is only suitable for permeability higher than 0.5×10 -3 μm 2 Core test, unable to test low permeability, ultra-low permeability core
The low permeability and ultra-low permeability test methods used in the petroleum field are mainly to increase the pressure of the conventional Darcy's law permeability test (even if the pressure is increased, it is often difficult to obtain results), pressure drop method, pulse method, nuclear magnetic resonance method, etc. Unsteady state method is difficult to accurately describe the real permeability properties
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0033] figure 1 The test temperature of the permeability damage evaluation device for well fluid contamination is set at 180°C, and the dimensions of its two core holders are φ50×100mm and 50×50×100mm respectively. The computer acquisition and processing system consists of pressure sensors, temperature sensors and computer data The processing system is composed of 7 pressure sensors installed on the X-axis, Y-axis, Z-axis of the core holder and both ends of the two core holders, one at each end; 4 temperature sensors are installed on each The core holder has two ends, one at each end. The data collected by the sensors is directly fed into the computer for processing. figure 2 , the outer diameter is 15mm, the inner diameter is 10mm, the length is 10mm, the screen aperture is 1.00mm, 18 mesh, the head 18 is made of rubber "O" type, and the plug 20 and the pressure cap 19 are connected by threads to form an airtight Contaminated fluid interface. The airtight container in the...
Embodiment 2
[0035] It is basically the same as that of Example 1, except that the core holders are φ38×60mm and 3.8×3.8×60mm in size, and the screen aperture is 0.6mm and 30 mesh.
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Abstract
The invention relates to a device for evaluating the permeability damage of the well fluid to the reservoir; one end of the two-axis core holder and the three-axis core holder is divided into two branches, one is connected to the intermediate container A and the pump body in sequence, and the other is connected to the pump body in sequence Bypass valve, downstream shut-off valve, back pressure device and gauge; the other end is connected to booster and confining pressure pump; core holder is composed of two-end devices and sealing devices, and the two-end devices consist of a plug with a central hole at one end The other end is composed of a plug with a central hole, a pressure sensor and a contaminated liquid interface; the sealing device has a heating system, a pressure sensor and a temperature sensor; the well fluid pollution system consists of an intermediate container B connected to a pollution pump and a vacuum pump; The intermediate container B is connected to the two-axis core holder and the inner connecting pipe of the three-axis core holder through the contaminated liquid interface; Reservoir permeability damage provides a means of evaluation.
Description
technical field [0001] The invention relates to a device for evaluating the permeability damage of well fluid to reservoir formation. Background technique [0002] Porous media is one of the most important characteristics of rocks. There are holes and cracks inside, that is, pores, which are filled with fluids such as water, oil, and gas. Permeability is a key physical parameter describing the transport ability of water, oil and gas in rock pores. For oil and gas production, permeability is one of the important indicators for the evaluation and prediction of oil and gas reservoirs. At the same time, due to the invasion of well fluid and various physical and chemical reactions with reservoir rocks or fluids, the permeability of the reservoir is damaged, resulting in damage to the reservoir. The misjudgment of permeability affects the evaluation of oil and gas reservoirs; the damage to permeability after well fluid entering the well is also an important method for the researc...
Claims
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IPC IPC(8): G01N15/08
Inventor 赖晓晴苏义脑杨恒林田中兰鲜保安屈沅治路立君何爱国王开龙李彦琴杨海军
Owner BC P INC CHINA NAT PETROLEUM CORP