Gas-based trace chemistry tracer and method for using gas-based trace chemistry tracer to measure gas production contribution amount of various sections of gas well

A chemical tracer and tracer technology, which is applied in the field of gas-based trace chemical tracers to measure the contribution of gas production in each section of a gas well by using chemical tracers, can solve the problems of difficult determination of contribution, and achieve biological stability Good chemical stability, good data reproducibility, and high accuracy

Pending Publication Date: 2018-04-24
BEIJING GEPETTO OIL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, horizontal wells are divided into about 20 stages, and the total production of each well after fracturing is more than 100,000 cubic meters per day, but the contribution of each stage is difficult to determine
At present, there is no mature technology in China, so there is an urgent need to develop low-cost chemical tracer technology, perform segmental production test, and obtain the sweet spot distribution of each well, so as to provide an effective basis for subsequent repeated fracturing

Method used

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  • Gas-based trace chemistry tracer and method for using gas-based trace chemistry tracer to measure gas production contribution amount of various sections of gas well
  • Gas-based trace chemistry tracer and method for using gas-based trace chemistry tracer to measure gas production contribution amount of various sections of gas well
  • Gas-based trace chemistry tracer and method for using gas-based trace chemistry tracer to measure gas production contribution amount of various sections of gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: from 2XX wells

[0053] 1. Formulation of tracer dosage

[0054] The design of tracer dosage needs to be comprehensively formulated in combination with conditions such as pressure, formation lithology conditions and single-stage productivity. The dosage calculation formula is:

[0055] M=100*K p *T*3.14*r 2

[0056] In the formula:

[0057] M—the amount of tracer, kg;

[0058] K p —— formation porosity, %;

[0059] T——The minimum tracer concentration of the tracer (ppb);

[0060] R——maximum production capacity radius, m.

[0061] 2. Pump injection of tracer

[0062] For tracer injection, the fracturing design plan must be provided first, and then the operator will design the tracer injection according to the fracturing plan, and design the tracer injection process according to the fracturing pumping procedure.

[0063] 3. On-site injection of tracer

[0064] Well 2XX began to inject the first stage of tracer with the fracturing fluid on December 20...

Embodiment 2

[0073] Example 2: Gao 001-XX well

[0074] 1. The tracer injection scheme is shown in Table 2-6

[0075] Table 2 The first stage tracer injection process

[0076]

[0077] Note: The gas agent is added from the liquid volume of 50 cubic meters, and the addition time is 10 minutes.

[0078] Table 3 The tracer injection process in the second stage

[0079]

[0080] Note: The gas agent is added from the liquid volume of 35 cubic meters, and the addition time is 10 minutes.

[0081] Table 4 The third stage tracer injection process

[0082]

[0083] Note: The gas agent is added from the liquid volume of 50 cubic meters, and the addition time is 10 minutes.

[0084] Table 5 Tracer injection process in the fourth stage

[0085]

[0086] Note: The gas agent is added from the liquid volume of 35 cubic meters, and the addition time is 10 minutes.

[0087] Table 6 Tracer injection process in the fifth section

[0088]

[0089]

[0090] Note: The gas agent is added...

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Abstract

The invention belongs to the technical field of energy exploitation, particularly relates to a gas-based trace chemistry tracer, and further relates to a method for using the gas-based trace chemistrytracer to measure the gas production contribution amount of various sections of a gas well. The gas-based trace chemistry tracer is a fluorocarbon of which the solubility in water is smaller than 0.001 g at the temperature of 50-150 DEG C, and is particularly perfluor alkane, perfluorocycloalkane, perfluor aromatic hydrocarbon, perfluoroalkyl acid or perfluoroalkyl group ethylene vinyl acetate. The gas-based trace chemistry tracer is radiationless and poisonless; the tracer does not react with other elements, and the biological stability and the chemical stability are high; the dosage is small and is 1/1,000,000 or below; the maximal borne temperature is 360 DEG C, and the maximal borne pressure is 25 Kpsi; the tracer is only dissolved in specific oil gas, and is not dissolved in any medium of stratums and shafts; a gas chromatograph is adopted for concentration detection, the speed is high, the sensitivity is high, the data reproducibility is good, and the accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of energy exploitation, and in particular relates to a gas-based trace chemical tracer, and also relates to a method for measuring the gas production contribution of each section of a gas well by using the chemical tracer. Background technique [0002] In recent years, China has conducted investigations and studies on domestic shale gas resources, and launched the project "Shale Gas Resource Potential in Key Areas of China and Selection of Favorable Areas". At present, my country has determined the main strata, mastered the basic parameters of shale gas, and selected 27 favorable areas. It is estimated that by 2020, my country's natural gas demand will be 320 billion cubic meters, and shale gas production will be 80 billion cubic meters. By 2020, shale gas production will account for about a quarter of the demand. The development of shale gas will help improve my country's primary energy consumption structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/11C09K3/00
CPCC09K3/00E21B47/11
Inventor 曾斌徐太平敖科周京伟易亚军
Owner BEIJING GEPETTO OIL TECH
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