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Method for detecting analogue cable formation tester

A stratum tester and stratum test technology, applied in the direction of instruments, electrical digital data processing, special data processing applications, etc., can solve the problems that cannot be done

Inactive Publication Date: 2008-11-26
CHINA OILFIELD SERVICES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The stated conditions require that the instrument parameters of the formation tester should adapt to the parameters of the test formation as much as possible, but it is not possible to do so at present

Method used

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  • Method for detecting analogue cable formation tester
  • Method for detecting analogue cable formation tester
  • Method for detecting analogue cable formation tester

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0171] According to the above method, the influence of the pumping pressure difference of the formation tester on the measuring range of the instrument is investigated.

[0172] The maximum pressure difference that the suction pump of the formation tester can produce determines the lower limit of the permeability of the formation that the instrument can work on. If the maximum pressure difference that the suction pump of the instrument can produce is 3000 psi, set the formation fluidity to 0.1md / cp and 1md respectively. / cp, 10md / cp, perform finite element numerical simulation, and the pressure response results are as follows Figure 5 , Figure 6 with Figure 7 . It can be seen from the figure that when the fluid viscosity is 1cp and the formation permeability is 1md and 10md, the pressure curve of the test process can get good results. When the formation permeability is 0.1md, the suction pump is required to be able to A pressure difference of 2960 psi is produced. Therefore, th...

Embodiment 2

[0174] In high permeability formations, if the suction volume of the instrument is too small, an effective pressure response process cannot be obtained. If the suction volume is too large, the operating cost will increase. Therefore, it is very important for the measurement of the instrument to select the appropriate flow rate for the formation of different properties. When the flow rate is 1md / cp, when the flow rate of the probe changes from 5ml / min to 10ml / min, see Figure 8 , The curve formed by the dashed line represents the pressure change with time when the flow rate is 5ml / min, and the curve formed by the solid line represents the pressure change with time when the flow rate is 10ml / min. The pressure drop can be seen from the figure Increase from about 300psi at 5ml / min to about 600psi at 10ml / min, that is, when the flow rate doubles, the pressure drop also doubles, that is, the flow rate is proportional to the pressure drop. Therefore, if the test flow rate of the instrume...

Embodiment 3

[0176] At the same time, the anisotropy of the formation will also change the pressure curve. The pre-test flow rate is 5ml / min, and the ratios of vertical permeability to horizontal permeability are 0.1, 0.25, and 1, respectively. The pressure response of the test process obtained when the formation horizontal permeability is 0.1md, 1md and 10md are as follows: Picture 9 , Picture 10 , Picture 11 Shown. In the figure, the curve composed of a solid line represents the relationship of pressure with time when the ratio of vertical permeability to horizontal permeability is 0.1; the curve composed of a dotted line represents when the ratio of vertical permeability to horizontal permeability is The relationship between pressure changes with time at 0.25; the curve composed of small dots represents the relationship between pressure changes with time when the ratio of vertical permeability to horizontal permeability is 1. It can be seen from the figure that the anisotropy The smaller...

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Abstract

The test process with analog cable stratum tester includes establishing finite element model for the test process of cable stratum tester; setting the parameters of finite element model stratum and instrument and calculating the matrix values except pressure and pressure and pressure derivative; and calculating the relation between pressure change in test area with stratum parameters and instrument parameters based on the mathematic model with known matrix values. By means of the finite element method, the present invention obtain relation between pressure change in test area with stratum parameters and instrument parameters via solving in the mathematic model of complex test area, and has short time and low cost.

Description

Technical field [0001] The invention relates to a method for simulating the test of a cable formation tester in the technical field of petroleum exploration, in particular to a method that uses a three-dimensional finite element numerical method to simulate the test process of the cable formation tester to obtain the relationship between test pressure changes and formation parameters and instrument parameters , The method of optimizing the instrument parameters of the tester. Background technique [0002] Since the first commercial formation tester came out in 1955, the formation tester has gradually developed from an instrument that can only perform sampling to an instrument with multiple functions that is indispensable in reservoir formation evaluation. In order to evaluate the reservoir formation, it is necessary to use the formation tester to accurately test the formation parameters. During the test, by detecting the pressure of the formation tester, according to the given fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/00
Inventor 陶果谷宁刘书民
Owner CHINA OILFIELD SERVICES
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