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

Abstract

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

CLC Number:

TE357

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

Figures/Tables 9

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References 28

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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

Test and application of new amphoteric-nonionic foaming agents in Lower Palaeozoic gas reservoir

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