射流泵工艺在常压页岩气排水采气中的研究与应用

Abstract

Abstract:

Pengshui block is a typical shale gas reservoir at atmospheric pressure which has lower coefficient of original formation pressure, and usually needs artificial lift recovery after fracturing. In the initial stage, we optimized the electric submersible pump for the drainage gas recovery. This technology was simple, meanwhile, the formation energy declined gradually, the formation liquid supply gradually decreased and the recovered fluid contained impurities such as sand and clay particle, so that it was hard to realize the stable continuous drainage and recovery, and had complex operation precess and high production cost. In order to solve these problems, we researched and applied the jet pump, and optimized the technology parameters and matching technology. At last, we formed a set of jet pump technology suitable for the drainage gas recovery of shale gas at atmospheric pressure to effectively guide the pressure of shale gas recovery.

Key words: Pengshui block, shale gas at atmospheric pressure, jet pump, drainage gas recovery, process parameters, matching process

CLC Number:

TE355.52

Yuhai Wang,Haibang Xia,Kai Bao, et al. Research and application of jet pump technology in drainage gas recovery of shale gas at atmospheric pressure[J]. Reservoir Evaluation and Development, 2019, 9(1): 80-84.

Figures/Tables 6

Table 1

Fig. 1

Table 2

Table 3

Table 4

Fig. 2

References 10

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名称	有杆泵	螺杆泵	电潜泵	气举
含砂（细煤粒）限制,%	<0.1	<10	<0.02
气液比/（m³·m^-3）	<0.5	<0.05	<0.05
井斜限制/°	<60°	<5°	均适用
最大排量/（m³·d^-1）	160	30	20~400
深度限制/m	<2 000	<1 500	<3 200
温度限制/℃	<150	<90	<150
最小流压/MPa	<1.0	<1.0	<1.4
泵效,%	50~60	<40	50~70
可靠性	95 %	对温度和电故障敏感	可靠	可靠
特殊要求	需电源	需可靠的电力系统	需电源	气源

井口压力/MPa	动液面/m	动力液量/(m³·d^-1)	地层产液量/(m³·d^-1)	流量比/M	压头比/H	效率/N	气蚀流量比	有功/kW
23.6	1 400	113.40	32.72	0.288 5	0.634 2	18.30	0.323 1	38.72
23.6	1 500	114.90	30.75	0.267 6	0.677 9	18.14	0.299 6	39.23
23.6	1 600	116.38	28.82	0.247 6	0.720 7	17.85	0.274 4	39.74
23.6	1 700	117.84	26.87	0.228 0	0.763 9	17.42	0.247 0	40.23
23.6	1 800	119.28	24.93	0.209 0	0.807 0	16.87	0.216 6	40.73
23.0	1 900	119.85	21.69	0.181 0	0.873 3	15.81	0.182 8	39.88
21.6	2 000	119.28	16.82	0.141 0	0.974 8	13.74	0.141 7	37.28

油管直径（由上至下）/mm	钢级	起下管柱时最大拉应力/N	生产时最大拉应力/N	允许抗拉强度/(MPa·N^-1)	安全系数
89 mm平式2 740 m	N80	372 640	409 128	432.33/706 787	1.73
48.26 mm平式2 740 m	N80	123 848	-123 848	329.59/169 380	1.37

	第一次	第二次	第三次	第四次
主要配置	泵深：2 305.22 m 喷嘴/喉管：2.4/3.6 mm柱塞泵：3MC125—6/25	泵深：2 303.34 m 喷嘴/喉管：2.4/3.6 mm 液压调剖堵水泵：TDB—11G	泵深：2302.13 m 喷嘴/喉：2.0/2.6 mm柱塞泵：3MC125—7/35	泵深：2 302.13 m 喷嘴/喉管：2.0/2.6 mm 柱塞泵：3MC125—7/35
运行问题	柱塞泵额定压力偏小; 出液口含大量气体等	柱塞泵多次出现故障（漏油,更换缸套）; 中心油管漏失	喷嘴/喉管失效快（<168 h）; 产液量波动较大	无
泵效	2 %~3 %	3 %~8 %	4 %~6 %	7 %~8 %
运行效果	较差	较好	较好	好
改进方案	更换液压调剖堵水泵, 更换350型采气树井口,井下安装多级气锚,规范地面流程	更换柱塞泵：3MC125—7/35	更改喷嘴、喉管结构设计, 并改进材质

Research and application of jet pump technology in drainage gas recovery of shale gas at atmospheric pressure

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