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

Abstract

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

CLC Number:

TE37

WU Zhuangkun, ZHANG Honglu, CHI Yuxuan, YIN Zhonghua, ZHANG Zhuang. 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.

Figures/Tables 10

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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

Improvement and application of a novel drainage pump of deep coalbed methane wells in south Yanchuan

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