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Method of measuring contamination rate of underground formation fluid

A technology of formation fluid and pollution rate, which is applied in the field of exploration and well logging, can solve the problems of high cost, inability to quantitatively give fluid pollution rate, poor accuracy, etc.

Active Publication Date: 2020-03-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing technologies all qualitatively indicate the pollution degree of the formation fluid, and cannot quantitatively give the pollution rate of the fluid
Moreover, the existing technology has disadvantages such as high cost and poor precision.

Method used

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  • Method of measuring contamination rate of underground formation fluid
  • Method of measuring contamination rate of underground formation fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In an exploratory well in Block 11 of Weizhou in the west of the South China Sea, circulating mud was collected from the wellhead and subjected to pressure filtration to obtain mud filtrate. At room temperature, measure the conductivity σ of the mud filtrate with a conductivity meter 0 is 21.2μS / cm, and record room temperature T 0 is 22°C. The cable formation sampler was used to pump samples at 1973.5 meters downhole, and the curve of pumping time and conductivity value of formation fluid measured downhole was recorded as follows: figure 1 Shown, record the formation temperature T 1 It is 84.2°C. The graph of pumping time and conductivity value, the conductivity σ at the initial stage f The highest value is 51 μS / cm; the background value of the conductivity of the formation water in this oilfield is 10 μS / cm; take the time of pumping for 100 minutes, and read the conductivity σ of the formation fluid at the time of 100 minutes z It is 14.7μS / cm.

[0051] According...

Embodiment 2

[0057] In an exploratory well in Block 29, Bozhong, Bohai Sea, circulating mud was collected from the wellhead and filtered to obtain mud filtrate. At room temperature, measure the conductivity σ of the mud filtrate with a conductivity meter 0 is 27μS / cm, and record room temperature T 0 is 24°C. The cable formation sampler was used to pump samples at 1486.5 meters downhole, and the curve of the pumping time and the conductivity value of the formation fluid measured downhole was recorded as follows: figure 2 Shown, record the formation temperature T 1 It is 76°C. The graph of pumping time and conductivity value, the conductivity σ at the initial stage f The highest value is 57 μS / cm; the background value of the formation water conductivity in this oilfield is 6 μS / cm; the pumping time of 210 minutes is taken, and the formation fluid conductivity σ at 210 minutes is calculated z It is 8.5μS / cm. At 210 minutes, sampling was carried out, and the results of laboratory analys...

Embodiment 3

[0063] In an exploratory well in Block 6 of Caofeidian in the Bohai Sea area, circulating mud was collected from the wellhead and subjected to pressure filtration to obtain mud filtrate. At room temperature, measure the conductivity σ of the mud filtrate with a conductivity meter 0 is 27μS / cm, and record room temperature T 0 It is 21°C. The cable formation sampler is used to pump samples at 1595.5 meters downhole, and the curve of pumping time and the conductivity value of the formation fluid measured downhole is recorded as follows: image 3 Shown, record the formation temperature T 1 is 69°C. The graph of pumping time and conductivity value, the conductivity σ at the initial stage f The highest value is 35 μS / cm; the background value of the formation water conductivity in this oilfield is 5 μS / cm; the pumping time of 90 minutes is taken, and the formation fluid conductivity σ at 90 minutes is calculated z It is 6.24μS / cm. At 90 minutes, sampling was carried out, and th...

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Abstract

The invention relates to a method of measuring contamination rate of an underground formation fluid. The method comprises the following steps of step a, taking circular mud at the mouth of a well to obtain a mud filtrate; and in a room temperature condition, measuring the conductivity theta of the mud filtrate and recording the room temperature T; and step b, pumping the underground formation fluid by using a cable formation sampler and recording the conductivity of the formation fluid, a corresponding moment and the formation temperature T1; selecting the highest value thetaf of the conductivity of the formation fluid and the conductivity thetaz of the formation fluid at a special moment after the highest value thetaf of the formation fluid; and introducing parameters theta, T0, T1, thetaf and thetaz into a formula to obtain the contamination rate of the underground formation fluid at the special moment. The measuring method can be used for acquiring the contamination rate of the underground formation fluid in an exploration logging stage by means of the cable formation sampler, provides basic parameters to explain and evaluate reservoir logging, provides a fast decision for the exploration stage, and can be widely applied to seaborne and onshore oil and gas fields of various types.

Description

technical field [0001] This article relates to the technical field of prospecting and well logging, especially a method for measuring the contamination rate of formation fluids downhole. Background technique [0002] In the stage of exploration and well logging, for water-bearing oil and gas reservoirs or water layers, the use of cable formation samplers to pump and sample formation fluids to determine the degree of contamination of formation fluids is the key technology for reservoir fluid identification. [0003] In the process of pumping and sampling formation fluids with cable formation samplers, the pollution degree of formation fluids is monitored mainly through conductivity or resistance detectors, density detectors, optical, acoustic, nuclear magnetic resonance fluid analysis and other methods. [0004] The conductance or resistance detector measures the conductivity or resistivity value of the formation fluid in a large range through the electromagnetic induction co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B49/08E21B47/00
CPCE21B49/00E21B49/08E21B47/00
Inventor 刘海波杨玉卿张国强王健徐大年王猛吴乐军范川左有祥李扬
Owner CHINA NAT OFFSHORE OIL CORP
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