Oil well optical fiber multi-parameter testing method and apparatus

Patent metadata

Field	Value
Publication number	US-12509985-B2
Application number	US-202318881223-A
Country	US
Kind code	B2
Filing date	Aug 30, 2023
Priority date	Nov 8, 2022
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

Provided in the present disclosure are an oil well optical fiber multi-parameter testing method and apparatus. The method includes: collecting monitoring data at a preset position, and the monitoring data at least includes temperature data, pressure data and vibration data; performing temperature analysis on a hydrocarbon reservoir according to the temperature data; performing vibration analysis on the hydrocarbon reservoir according to the vibration data; performing conjoint analysis on the hydrocarbon reservoir according to the temperature data, the pressure data and the vibration data; obtaining production parameters of hydrocarbon reservoirs in different formations according to the conjoint analysis; and obtaining flow conclusions of the hydrocarbon reservoirs according to the production parameters of the hydrocarbon reservoirs. The present disclosure solves the technical problem that it is difficult to guarantee the flow of deep-water hydrocarbon reservoirs under an offshore FPSO development mode.

First claim

What is claimed is:

1 . An oil well optical fiber multi-parameter testing method, comprising the steps of:
collecting monitoring data at a preset position, wherein the monitoring data at least comprises temperature data, pressure data and vibration data; performing temperature analysis on a hydrocarbon reservoir according to the temperature data; performing vibration analysis on the hydrocarbon reservoir according to the vibration data; performing conjoint analysis on the hydrocarbon reservoir according to the temperature data, the pressure data and the vibration data; obtaining production parameters of hydrocarbon reservoirs in different formations according to the conjoint analysis; and obtaining flow conclusions of the hydrocarbon reservoirs according to the production parameters of the hydrocarbon reservoirs; wherein the performing temperature analysis on a hydrocarbon reservoir according to the temperature data comprises: obtaining, at a formation depth where a pipe string is located, a temperature micro-differential between a position of the hydrocarbon reservoir and a position of an inner wall of a wellbore due to thermal effect; obtaining an original formation temperature of the formation depth where the pipe string is located according to the temperature data; obtaining an intermediate temperature variable according to the temperature micro-differential and the original formation temperature; and obtaining a temperature of the inner wall of the wellbore according to the intermediate temperature variable and the original formation temperature; wherein the performing vibration analysis on the hydrocarbon reservoir according to the vibration data comprises: obtaining a vibration frequency characteristic value according to a frequency expression formula; obtaining a vibration energy characteristic value according to an energy expression formula; and determining a flowrate of fluid and properties of the fluid in the hydrocarbon reservoir by combining the vibration frequency characteristic value and the vibration energy characteristic value.

2 . The oil well optical fiber multi-parameter testing method according to claim 1 , wherein in the step of collecting monitoring data at the preset position, the preset position at least comprises positions of a Floating Production Storage and Offloading (FPSO) hull, a submarine pipeline, a wellhead, a wellbore and different formations in a well.

3 . The oil well optical fiber multi-parameter testing method according to claim 2 , wherein the collecting monitoring data at the preset position comprises:
placing a monitoring optical cable into a well along with a pipe string; and performing distributed continuous temperature tests, pressure tests and vibration tests on the preset position.

4 . The oil well optical fiber multi-parameter testing method according to claim 3 , wherein the monitoring optical cable is provided therein with a plurality of optical fibers, each of which comprises one temperature measuring optical fiber, one vibration measuring optical fiber, and a plurality of pressure measuring optical fibers; and
the number of the pressure measuring optical fibers is determined according to the number of pressure measuring points in the preset position, so that each of the pressure measuring optical fibers is arranged at a corresponding pressure measuring point.

5 . The oil well optical fiber multi-parameter testing method according to claim 4 , wherein the pressure measuring optical fiber is provided with a plurality of optical fiber pressure sensors, and the optical fiber pressure sensors are arranged in layers at corresponding formation depths.

6 . The oil well optical fiber multi-parameter testing method according to claim 1 , wherein the performing temperature analysis on the hydrocarbon reservoir according to the temperature data comprises:
obtaining a position of a variable temperature region according to the temperature of the inner wall of the wellbore; obtaining a variable temperature area according to the position of the variable temperature region; and obtaining a variable diameter of the variable temperature region according to the variable temperature area.

7 . The oil well optical fiber multi-parameter testing method according to claim 1 , wherein the performing conjoint analysis on the hydrocarbon reservoir at least comprises: identifying an injected water source and an intraformational water source.

8 . The oil well optical fiber multi-parameter testing method according to claim 1 , wherein the production parameters of the hydrocarbon reservoirs at least comprise a production quantity of the hydrocarbon reservoir in each of the formations and a production percentage of the hydrocarbon reservoir in each of the formations.

9 . An oil well optical fiber multi-parameter testing apparatus, comprising:
a data collection unit configured to collect monitoring data at a preset position, wherein the monitoring data at least includes temperature data, pressure data and vibration data; a temperature analysis unit configured to perform temperature analysis on a hydrocarbon reservoir according to the temperature data; a vibration analysis unit configured to perform vibration analysis on the hydrocarbon reservoir according to the vibration data; a conjoint analysis unit configured to perform conjoint analysis on the hydrocarbon reservoir according to the temperature data, the pressure data and the vibration data; a data obtaining unit configured to obtain production parameters of hydrocarbon reservoirs in different formations according to the conjoint analysis; and a conclusion obtaining unit configured to obtain flow conclusions of the hydrocarbon reservoirs according to the production parameters of the hydrocarbon reservoirs.

10 . The oil well optical fiber multi-parameter testing apparatus according to claim 9 , wherein the data collection unit comprises a monitoring optical cable, the monitoring optical cable is provided therein with a plurality of optical fibers, each of which comprises one temperature measuring optical fiber, one vibration measuring optical fiber, and a plurality of pressure measuring optical fibers, and the number of the pressure measuring optical fibers is determined according to the number of pressure measuring points in the preset position, so that each of the pressure measuring optical fibers is provided at a corresponding pressure measuring point.

11 . The oil well optical fiber multi-parameter testing apparatus according to claim 10 , wherein the pressure measuring optical fiber is provided with a plurality of optical fiber pressure sensors, and the optical fiber pressure sensors are arranged in layers at corresponding formation depths.

12 . The oil well optical fiber multi-parameter testing apparatus according to claim 11 , wherein the monitoring optical cable is bound to a pipe string and placed into a well together therewith, and the pipe string is provided with pressure gauge carriers at positions where the optical fiber pressure sensors are located.

13 . The oil well optical fiber multi-parameter testing apparatus according to claim 10 , wherein the monitoring optical cable is protruded out of a through hole at a wellhead and connected to a test demodulation device on an FPSO hull, and the wellhead is sealed.

Assignees

• Petrochina Co Ltd

Inventors

• Li Yunbo
• Qi Mei
• Yang Zhaopeng
• Xu Likun
• Liu Zhangcong
• Xu Fang
• Liu Jian
• Li Jian

Classifications

• G01L11/025

  using a pressure-sensitive optical fibre · CPC title

• G01K11/32

  using changes in transmittance, scattering or luminescence in optical fibres · CPC title

• G01D21/02

  Measuring two or more variables by means not covered by a single other subclass · CPC title

• E21B47/06 Primary

  Measuring temperature or pressure · CPC title

• E21B47/135

  using light waves, e.g. infrared or ultraviolet waves · CPC title