新型两性非离子型泡排剂在下古气藏的试验与应用

doi:10.13809/j.cnki.cn32-1825/te.2022.02.008

摘要/Abstract

摘要：

大牛地气田下古气藏地层水矿化度高、呈偏酸性,多采用井下节流工艺,导致气田广泛使用的两性泡排剂起泡、稳泡性能差,无法满足高效、低成本排水采气的需求。国内外虽已形成几十种泡排剂,但针对大牛地气田下古气藏特性研制的泡排剂未见报道。针对下古气藏流体和工艺特点,考虑高矿化度地层水的影响、对pH的敏感度及泡沫通过节流器时的稳定性等因素,构建一种以磺化AEO₃（椰油醇聚氧乙烯（3）醚）与月桂酰胺丙基磷酸甜菜碱为主剂、椰子油脂肪酸单乙醇酰胺为助泡剂、油患子精华素为稳泡剂的新型两性非离子复合型泡排剂。室内评价表明,两性非离子复合型泡排剂在高矿化度、酸性环境下具有较强的起泡、稳泡、二次起泡和携液能力;现场试验应用后,气井排液能力提升、油套压差降低、产气量增加,应用效果和经济效益前景良好。两性非离子复合型泡排剂填补了大牛地气田下古气藏泡排剂的空缺,可改善下古气藏气井携液不足的技术难题,具有推广应用价值。

关键词: 大牛地气田, 下古气藏, 两性非离子复合型泡排剂, 抗矿化度, 二次起泡

Abstract:

The formation water of Lower Palaeozoic gas reservoir in Daniudi Gas Field is high-salinity and acidity, and downhole throttling technology is mostly used. Thus, the amphoteric foaming agents widely used in gas fields has poor foaming and foam stabilization performance, and this cannot meet the demand for high-efficiency and low-cost drainage gas recovery. Although dozens of foaming agents have been formed internationally, there is no reports about foaming agents developed for the characteristics of Lower Palaeozoic reservoir of Daniudi Gas Field. Considering the fluid and process characteristics of Lower Palaeozoic reservoir, and the influence of high-salinity formation water, the sensitivity to pH and the stability of foam passing through the choke, to construct a new type amphoteric-nonionic compound foaming agent with sulfonated AEO₃ and lauramide propyl phosphobetaine as the main agent, coconut oil fatty acid monoethanolamide as the foaming aid, and sapindus extract as the foam stabilizer. The indoor evaluation shows that the amphoteric-nonionic composite foaming agent has strong foaming, stabilizing-foam, secondary foaming and liquid-carrying ability under high-salinity and acidic; after the field test application, the well drainage capacity improved, the pressure difference with tubing to casing decreased, and the gas production increased. It is shown that its application effect and economic benefits prospects are good. The amphoteric-nonionic composite foaming agent fills the void of the foaming agent for Lower Palaeozoic gas reservoir in Daniudi Gas Field, improving the technical problems of insufficient liquid-carrying, and has the value of popularization and application.

Key words: Daniudi Gas Field, Lower Palaeozoic gas reservoir, amphoteric-nonionic compound foaming agent, anti-mineralization, secondary foaming

中图分类号:

TE357

杨兵,张泰来,李佳,赵建军,王成锋. 新型两性非离子型泡排剂在下古气藏的试验与应用[J]. 油气藏评价与开发, 2022, 12(2): 329-336.

YANG Bing,ZHANG Tailai,LI Jia,ZHAO Jianjun,WANG Chengfeng. Test and application of new amphoteric-nonionic foaming agents in Lower Palaeozoic gas reservoir[J]. Reservoir Evaluation and Development, 2022, 12(2): 329-336.

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气藏	地层水性质									节流工艺
气藏	K⁺+Na⁺ （mg/L）	Ca²⁺ （mg/L）	Mg²⁺ （mg/L）	SO₄^2- （mg/L）	HCO₃^- （mg/L）	Cl^- （mg/L）	矿化度（g/L）	pH	水型	节流工艺
上古	4 147~14 435	1 236~13 721	66~1 028	0~291	223~1 023	7 621~52 678	14~79	6.0~6.2	CaCl₂	站内节流
下古	10 752~16 652	40 409~59 088	7 447~8 999	2 266~2 675	590~876	88 147~155 201	150~260	4.8~5.4	CaCl₂	井下节流

pH	矿化度（g/L）	起泡高度（mm）	稳泡高度（mm）	携液量（mL）	样液总体积（mL）	携液率（%）
5	50	158	155	345	400	86.3
	100	154	148	346	400	86.5
	150	157	150	342	400	85.5
	200	156	150	345	400	86.3
	250	155	150	343	400	85.8
	300	153	145	335	400	83.8

矿化度（g/L）	pH	起泡高度（mm）	稳泡高度（mm）	携液量（mL）	样液总体积（mL）	携液率（%）
250	7	160	155	355	400	88.8
	5	155	150	343	400	85.8
	3	142	138	320	400	80.0
	1	108	78	232	400	58.0

泡排剂	演示装置	携液量（mL）	样液总体积（mL）	携液率（%）
两性泡排剂	直井演示装置	785	1 000	78.5
两性泡排剂	井下节流器演示装置	390	1 000	39.0
新型泡排剂	直井演示装置	845	1 000	84.5
新型泡排剂	井下节流器演示装置	805	1 000	80.5

对比项目	试验前	试验稳定期间	试验后
对比项目	5月11日—5月17日	5月28日—6月14日	6月15日—6月21日
泡排剂	两性泡排剂	新型泡排剂	两性泡排剂
加注周期	每天一次	每天一次	每天一次
加注量（L）	5	5	5
药水比例	1∶10	1∶10	1∶10
产气量（m³/d）	532~3 286 2 109	2 509~3 937 3 196	2 793~3 408 3 017
产液量（m³/d）	0.21~0.68 0.43	0.57~1.85 0.94	0.33~0.66 0.44
油压（MPa）	1.00~1.80 1.43	1.03~2.347 1.38	1.20~1.90 1.63
套压（MPa）	5.60~6.10 5.80	5.50~5.80 5.63	5.72~5.90 5.86
油套压差（MPa）	3.80~5.06 4.37	3.03~4.55 4.25	4.00~4.70 4.23