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Gas injection capability evaluation method for depleted oil and gas reservoir gas storage

A technology for gas storage and oil and gas reservoirs, which is applied in earth-moving drilling, mining equipment, instruments, etc., can solve problems such as differences in physical and chemical properties, and achieve the effect of saving investment.

Active Publication Date: 2020-11-13
CNPC BOHAI DRILLING ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, natural gas and nitrogen have obvious differences in physical and chemical properties. How to use nitrogen injection to evaluate the natural gas injection capacity of the gas storage is an urgent problem to be solved.

Method used

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  • Gas injection capability evaluation method for depleted oil and gas reservoir gas storage
  • Gas injection capability evaluation method for depleted oil and gas reservoir gas storage
  • Gas injection capability evaluation method for depleted oil and gas reservoir gas storage

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Experimental program
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Embodiment

[0044] A depleted gas reservoir is taken as the target gas reservoir of the gas storage, the gas reservoir pressure is 7.94MPa, and the gas reservoir temperature is 83.29℃. The purity of nitrogen is 99.2%, the relative density is 0.966, the relative density of natural gas is 0.6, and the central depth is 2831.05m.

[0045] (1) Using the productivity test method of conventional natural gas wells, the designed 4 stable nitrogen gas injection rates are 18×10 4 m 3 / d, 24×10 4 m 3 / d, 30×10 4 m 3 / d and 36×10 4 m 3 / d; Lower the cable direct-reading pressure gauge into the middle of the depleted oil and gas reservoir at a depth of 2831.05m, record the flow pressure and temperature at each nitrogen gas injection rate until the flow pressure reaches a stable level, and measure the nitrogen gas injection rate q N , the corresponding steady flow pressure p wf , steady flow temperature T wf , stable wellhead pressure p wh and stable wellhead temperature T wh , and finally sh...

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Abstract

The invention discloses a gas injection capability evaluation method for a depleted oil and gas reservoir gas storage. A depleted oil and gas reservoir is a gas storage built from an abandoned gas reservoir having been mined out already or a decommissioned gas reservoir having been mined to a certain extent; and due to a shortfall in output of natural gas of parts of oil and gas fields, gas sources are not enough for a pilot injection test at a pre-feasibility research stage of the initial period of gas storage construction, and the gas injection capability of the gas storage cannot be implemented clearly. Nitrogen replaces the natural gas as an injection medium to evaluate the gas injection capability of the gas storage, thus a gas injection working system is determined, and gas injectionstring is designed; and the method for evaluating the capability to inject the natural gas into the gas storage through pilot injection of the nitrogen is provided for the depleted oil and gas reservoir gas reservoir, the gas injection working system is determined, the gas injection string is designed, the basis is provided for the design of the gas storage, and thus the investment is saved.

Description

technical field [0001] The invention relates to the field of oil and gas resource development, in particular to a method for evaluating the gas injection capacity of a depleted oil and gas reservoir gas storage. Background technique [0002] Depleted oil and gas reservoirs are gas storages built using depleted and abandoned gas reservoirs or decommissioned gas reservoirs that have been exploited to a certain extent. Oil and gas exploration and development workers are concerned about the geological conditions of this type of gas storage, such as oil (gas) reservoir area, reservoir thickness, caprock gas seal, original formation pressure and temperature, gas reservoir porosity, permeability, average The nature and gas well operation system have been accurately grasped, and no geological exploration is required. Part of the gas wells and surface facilities used for oil and gas field development can be reused for underground gas storage. The amount of cushion gas that needs to ...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21F17/16G06Q50/02
CPCE21B49/00E21F17/16G06Q50/02
Inventor 刘述忍李兴华徐凤兰李琳琳赵刚雷鹏张喜范宜祥王光辉张建峰刘文超方正张洪亮李丰渝朱卫平王鹏陈燕鹿晓涵王靖淇
Owner CNPC BOHAI DRILLING ENG
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