靖边气田不同气井泡沫排水采气工艺优化技术研究

发布时间：2018-02-24 23:14

  本文关键词： 靖边气田 排水采气 泡沫排水 泡排剂 气井分类　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：靖边气田属于低压、低渗、低产气田,各区块气井都有不同程度产水情况存在。近年来,油田开展了各种排水采气方法研究,尤其是泡沫排水采气技术的推广应用,取得了较好的排水效果。但随着地层压力降低、产水井数量增加和地层水质变化,导致泡沫排水采气效果差别很大,迫切需要根据产水气井工况条件、水质特征和泡排剂性能开展不同气井泡沫排水采气工艺优化技术研究。本文在对靖边气田开发现状、产水原因和泡排效果调研、分析的基础上,采用化学容量法和仪器分析相结合的方法,对不同气井产出水的组成性质进行了综合分析,并对各种泡沫性能评价方法的优缺点、适用范围等进行了分析研究,同时开展了泡排剂性能评价方法研究,最后采用泡排剂评价新方法,详细分析研究了泡沫排水采气的影响因素和凝析油、甲醇、矿化度等对泡排剂性能的影响;确定出了适合不同产水气井的泡排剂种类、加量和泡沫排水采气工艺。研究结果表明:(1)采用标准中的静态(Ross-Miles法)和动态(SY/T5761-1995《排水采气用起泡剂CT5-2》法进行泡排剂性能评价的优点是简单、快速,但缺点是评价指标单一、片面,相互之间无法关联;改进的评价方法能系统全面地评价泡排剂的各种性能;(2)通过测定泡沫含水率随时间变化和泡沫携液率随流速变化更能反应泡排剂的性能;(3)影响泡排剂性能的关键因素是凝析油、甲醇、矿化度等;(4)泡排剂的耐盐性能适用条件:1#200g/L;2#100g/L;3#20g/L;4#100g/L;5#50g/L;(5)泡排剂的耐油性能适应条件:1#10%;2#2.5%;3#2.5%;4#5%;5#2.5%;(6)泡排剂的耐甲醇性能适应条件:1#20%;2#20%;3#10%;4#30%;5#30%;(7)气井分类按水质总矿化度分高(100g/L)、中(100g/L且50g/L)、低(50g/L)三类,每一类再依据凝析油含量细分为高(2.5%且10%)和低(≤2.5%)两类;(8)低矿化度低凝析油气井选择3#和5#泡排剂,低矿化度高凝析油气井选择1#和4#泡排剂,中矿化度低凝析油气井选择2#泡排剂,中矿化度高凝析油气井选择4#泡排剂,高矿化度低(高)凝析油气井选择1#泡排剂;(9)根据气井井况,选择药剂加注浓度、方式、周期,优化靖边气田不同气井的泡沫排水采气工艺技术。
[Abstract]:Jingbian gas field belongs to low pressure, low permeability and low production gas field, and the gas wells in each block have different degree of water production. In recent years, the oilfield has carried out research on various drainage gas recovery methods, especially the popularization and application of foam drainage gas recovery technology. But with the decrease of formation pressure, the increase of the number of wells produced and the change of formation water quality, the effect of foam drainage and gas recovery is very different, so it is urgent to base on the working conditions of water and gas production wells. The water quality characteristics and foam drainage agent performance of different gas wells are studied on the basis of the investigation and analysis of the present development situation, water production cause and bubble drainage effect of Jingbian gas field. By means of chemical capacity method and instrument analysis, the composition properties of water produced from different gas wells are comprehensively analyzed, and the advantages and disadvantages of various foam performance evaluation methods and their applicable scope are analyzed and studied. At the same time, the performance evaluation method of foam drainage agent was studied. Finally, the influence factors of foam drainage gas recovery and the effects of condensate oil, methanol and salinity on the performance of foam discharge agent were analyzed in detail by using the new method of foam drainage agent evaluation. The types of foam discharge agents suitable for different water and gas production wells have been determined. The research results show that the static Ross-Miles method of the standard and the dynamic SYP T5761-1995 method for evaluating the performance of foaming agent for drainage gas extraction are simple and rapid, but the disadvantages are that the evaluation index is single and one-sided. Not related to each other; The improved evaluation method can systematically and comprehensively evaluate the various properties of foam effluents. Condensate oil is the key factor that affects the performance of foam effluents by measuring the change of foam water content with time and foam carrying rate with flow rate. Suitable conditions for Salt tolerance of Bubble effluents: 1 / #200g / L / L / 2 #100g / L / L 3#20g / L / L 4#100g / L / L 4#100g / L / L / 5 #50g / L ~ (5)) Oil tolerance of foam draining agents: 1: 10 #2 #2.53#2.535 / 4 #52.5 / 4#52.5 / 5) the methanol performance of the foam draining agent adapts to the conditions of methanol tolerance of 1 #20g / L #20 / 2 #20 / L #2020 / L #2020 / 2 #20 / #30 #30 #5 #30g / L / L / 4 #20g / L / 4 #20 / 2 #20g / L #20 / 2 #20g / L #20g / L / #20g / L #20g / L #20g / L #20g / L #20g / L #20g / L #20g / L #20g / L #20g / L #20g / L #20g / L #20g / L #20g / L #20g / L 4#20g / L #20g / L. Each type is further subdivided into two categories according to the condensate oil content: high 2.5% and 10%) and low (鈮，

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