高压低渗气井产能二项式改进与求解

doi:10.11885/j.issn.1674-5086.2019.03.21.02

摘要/Abstract

摘要： 南海西部乐东X区气藏压力高达100 MPa，渗透率低至0.1 mD，该类高压低渗气井产能测试回归得到二项式产能方程斜率常为负，无法获取真实产能。对气井测试过程进行分析，认为传统二项式法未考虑地层压力变化是造成回归斜率负异常主要原因，建立有效供给范围内的物质平衡模型求解得到测试过程中平均地层压力，认为地层压力随产量和时间变化，且地层渗透率越低压力变化幅度越大。考虑测试过程中有效供给范围内地层压降，回归得到全新二项式产能方程及无阻流量表达式，认为气井实际无阻流量与原始地层压力、测试情况、地层物性均相关。对南海西部LDX-5-A等6口高压低渗井二项式产能方程进行矫正，成功解决该类井产能异常问题，为气田下步合理开发提供了依据，也为该类高压低渗气井产能异常矫正提供了解决思路。

关键词: 高压, 低渗, 气井, 二项式产能方程, 物质平衡

Abstract: The gas reservoir pressure in Ledong X Area of the western South China Sea is up to 100 MPa and permeability is as low as 0.1 mD. The binomial productivity equation slope obtained from the productivity test regression of such high pressure and low permeability gas wells is often negative, and the real productivity cannot be obtained. The production binomial's slope of high pressure and low permeability is always negative which results in failure to get real capacity. The gas well testing process is analyzed and the material balance model within the effective supply range is established and solved. It is considered that except the first level system, the formation pressure changes with the output and time, and the lower the permeability of the formation, the greater the pressure change. The traditional binomial method does not consider the formation pressure change is the main reason for the negative slope of regression. Taking into account the formation pressure drop in the effective supply range during the test, the new binomial equation of deliverability and the expression of unobstructed flow are obtained by regression. It is considered that the unobstructed flow in the gas well is related to the original formation pressure, test conditions and formation physical properties. The correction of the binomial production equation of six high pressure and low permeability wells, such as LDX-5-A, has successfully solved the production capacity anomalies in this type of wells, provided a basis for rational development of gas fields in the next step and a solution to the abnormal capacity correction of such high pressure and low permeability gas wells.

Key words: high pressure, low permeability, gas well, binomial production equation, material balance

中图分类号:

TE348

马帅, 张风波, 王雯娟, 查玉强, 王彦利. 高压低渗气井产能二项式改进与求解[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 121-126.

MA Shuai, ZHANG Fengbo, WANG Wenjuan, ZHA Yuqiang, WANG Yanli. Improvement and Solution Binomial Production Equation of High Pressure and Low Permeability Gas Wells[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 121-126.

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