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Water-based trace chemical tracer and method for measuring connectivity between water injection wells

A technology of inter-well connectivity and chemical tracing, applied in the field of oil and gas stimulation, can solve the problems of low test accuracy, poor monitoring reliability, poor adaptability, etc., and achieve good biological and chemical stability, convenient on-site construction, and detection. high precision effect

Active Publication Date: 2018-05-04
BEIJING GEPETTO OIL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Another object of the present invention is to provide a water-based trace chemical tracer to solve the problems of existing tracers, such as poor adaptability, large dosage, high cost, low test accuracy, poor monitoring reliability, and limited application range. question

Method used

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  • Water-based trace chemical tracer and method for measuring connectivity between water injection wells
  • Water-based trace chemical tracer and method for measuring connectivity between water injection wells
  • Water-based trace chemical tracer and method for measuring connectivity between water injection wells

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Embodiment 1

[0040] The method for measuring inter-well connectivity of water injection wells using the water-based trace chemical tracer of the present invention is used to measure the inter-well connectivity of any 446 well group in X Oilfield. The specific method is: Weigh 2 kg of sodium perfluoropentanesulfonate tracer (WSZ-1 for short) to prepare an aqueous solution of a certain concentration, add it to the injection water, and inject it into the well; after injecting the tracer for a period of time, take samples in the production well , to determine the tracer concentration.

[0041] The well group Ren 446 in X Oilfield was newly invested in early 2015, and the water content of production wells varies greatly. figure 1 It is the production well location map of Ren 446 water injection well group, the rock type is carbonate rock; the buried depth is 3500m; the pressure is 34.8MPa; the temperature is 130℃.

[0042] At the beginning of September 2015, the wellhead was constructed withou...

Embodiment 2

[0044] Using the water-based trace chemical tracer of the present invention to measure the inter-well connectivity of water injection wells, the main purpose of inter-well wells of 21 water injection well groups in X Oilfield is to determine the advancing speed and direction of injection fluid, and to find out the connection relationship between injection and production. The specific method is: Weigh 2 kg of sodium perfluorobutane sulfonate tracer (WSZ-3 for short) to prepare an aqueous solution of a certain concentration, add it to the injection water, and inject it into the well; after injecting the tracer for a period of time, take samples in the production well , to determine the tracer concentration.

[0045] Well Group 21 of X Oilfield was newly invested in early 2015, and the water content of production wells varies greatly. image 3 It is the production well location map of the 21 water injection well group, the rock type is carbonate rock; the buried depth is 3600m; t...

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Abstract

The invention discloses a water-based trace chemical tracer. The water-based trace chemical tracer comprises the components of perfluoroalkyl sulfonates or perfluoroalkyl carboxylates. A method for measuring connectivity between water injection wells by using the water-based trace chemical tracer comprises the steps that the tracer is prepared into aqueous solution with a certain concentration tobe added into injected water and then is injected into the wells; after the tracer is injected for a period of time, sampling is conducted in a production well, and the concentration of the tracer ismeasured. Through tracer monitoring, the connecting condition of oil-water wells and the water injection wells, the permeability within a water injection wave and the oil reservoir range, change of the permeability and the porosity within a water injection wave and oil reservoir range and the trend of natural cracks and artificial cracks can be understood, the reasonable injection-production ratiois determined, and the injection-production balance is optimized. The water-based trace chemical tracer has no radiation and no toxicity, and is safe, environmentally friendly, and less in using amount, high temperature and high pressure resistance is achieved, and the water-based trace chemical tracer is only soluble in water, has good biological stability and chemical stability, and can be effective in a stratum for a long time.

Description

technical field [0001] The invention belongs to the technical field of increasing production of oil and natural gas, in particular to an environment-friendly water-based trace chemical tracer and a method for measuring inter-well connectivity of water injection wells. Background technique [0002] Water-soluble tracers have been used in waterflood development reservoirs for many years, but initially they were used only to gain a qualitative understanding of subsurface fluid movement. In the mid-1960s, after Brigham and Smith of Stanford University in the United States proposed a method for predicting tracer fluidity in five-point well patterns, people used it from the opposite angle to explain the heterogeneity characteristics of reservoirs, thereby Make the interpretation of tracer data quantitative. At present, it has been able to quantitatively explain the delamination and production status of oil layers between wells, the sweep status between injection and production we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/11
CPCE21B47/11
Inventor 曾斌敖科徐太平周京伟刘磊
Owner BEIJING GEPETTO OIL TECH
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