新型排采泵在延川南深层煤层气井的改进及应用

doi:10.13809/j.cnki.cn32-1825/te.2023.04.002

摘要/Abstract

摘要：

针对延川南煤层气田因地层出煤粉导致机抽井频繁躺井作业的问题，开展了延川南煤层气井新型排采泵的改进及应用研究。新型排采泵游动凡尔设计为强制拉杆半球式密封，柱塞总成采用中空设计，泵径ø38 mm，冲程3.0 m，冲次1~3次/min，排量4.8~14.6 m³/d。新型排采泵与空心杆、油管配合使用，从而形成了生产和洗井双通道一体化管柱。既能满足正常的排水采气生产，又能实现洗井排煤粉的需求，而且洗井时洗井液不进入地层，避免了洗井液对地层的污染，实现了不起管柱作业并将煤粉从井中排出，解决了煤层气田排采井煤粉或砂粒沉积导致的固定阀失效和卡泵的问题。2022年，新型排采泵在延川南煤层气田开展了2口井现场应用，实施后没有发生固定阀失效和煤粉卡泵，措施井平均检泵周期延长285 d。现场试验表明：新型排采泵具有正常排水采气和通过洗井将煤粉从泵中排出双重功能，为延川南煤层气田防煤粉工艺提供了一种新的技术支持。

关键词: 煤层气, 排水采气, 煤粉卡泵, 新型排采泵, 检泵周期

Abstract:

In order to solve the problem of frequent well laying in the coalbed methane field in south Yanchuan due to sand production（pulverized coal）, a novel drainage pump in south Yanchuan coalbed methane well has been developed. The novel drainage pump is designed as a forced pull rod hemisphere-type seal, and the plunger assembly adopts a hollow design. The pump diameter is ø38 mm, the stroke is three meters, the stroke time ranges from one to three times per minute, and the displacement is 4.8~14.6 m³/d. The novel drainage pump is used together with hollow rod and tubing, forming a dual-channel integrated pipe string for production and cleaning. It can not only meet the normal drainage gas production, but also facilitates well flushing and discharging pulverized coal. In addition, the flushing fluid does not enter the stratum during well flushing, avoiding the pollution of the flushing fluid to the stratum and preventing the failure of the fixed valve and the pump from being stuck caused by the deposition of pulverized coal or sand in the coalbed methane field drainage well. In 2022, the novel drainage pump was applied in two wells in the south Yanchuan coalbed methane field, and since then, no fixed valve failure or pulverized coal card pump has occurred. As a result the average pump inspection period of measure wells has been extended by 285 days. Field tests demonstrate that the novel drainage pump has the dual functions of normal gas drainage and coal powder discharge through well flushing, providing a new technical support for improving the overall development level of coalbed methane field in south Yanchuan.

Key words: coalbed methane, drainage gas production, pulverized coal stuck pump, novel drainage pump, pump inspection cycle

中图分类号:

TE37

吴壮坤,张宏录,池宇璇等. 新型排采泵在延川南深层煤层气井的改进及应用[J]. 油气藏评价与开发, 2023, 13(4): 416-423.

Zhuangkun WU,Honglu ZHANG,Yuxuan CHI, et al. Improvement and application of a novel drainage pump of deep coalbed methane wells in south Yanchuan[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(4): 416-423.

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序号	砂子			煤粉
序号	砂子颗粒直径/ mm	砂子沉降速度/ （m/s）	最小携砂流量/ （m³/d）	煤粉颗粒直径/ mm	煤粒沉降速度/ （m/s）	最小携煤粉流量/ （m³/d）
1	0.05	0.052 25	7.926 420	0.05	0.000 68	0.099 232
2	0.07	0.064 41	8.639 787	0.07	0.001 34	0.594 401
3	0.10	0.078 99	9.304 220	0.09	0.002 74	0.897 507
4	0.11	0.082 95	10.878 720	0.11	0.003 94	1.571 598
5	0.12	0.090 30	11.945 030	0.12	0.006 16	2.193 665
6	0.23	0.196 00	11.222 720	0.13	0.010 90	2.581 323
7	0.33	0.201 00	12.751 120	0.14	0.024 60	3.568 858
8	0.41	0.310 20	13.987 320	0.19	0.033 50	4.860 030

序号	泵径/ mm	冲程/ m	冲次/ （次/min）	日产液/ （m³/d）	泵效/ %	煤粉排出情况
1	38	1.8	0.5	1.18	81.1	没有
1	38	3.0	1.0	4.14	85.2	有
2	38	3.0	2.0	6.70	81.0	有
3	38	3.0	3.0	10.00	81.0	有
4	38	3.0	4.0	13.20	80.0	有
5	38	3.0	5.0	14.60	80.0	有