循环洗井工艺在延川南煤层气田的应用

doi:10.13809/j.cnki.cn32-1825/te.2022.04.013

摘要/Abstract

摘要：

煤层气开发在排水采气过程中由于压降作用易产生煤粉及带入压裂砂,目前煤粉产出及压裂砂沉积已经成为制约煤层气连续稳定排采的关键性因素。以延川南煤层气田为研究区块,该区块因煤粉、砂沉积泵堵和卡泵造成的检泵作业比例较高。为了有效减少该类作业发生,延长气井免修期,保证气井生产连续性,降低运行成本,研制了循环洗井装置并制定了配套工艺。经过现场实际检验,明确了自动循环洗井工艺可有效降低气井检泵次数,空心杆自动循环洗井工艺可有效延长气井免修期,泵下洗井工艺可有效提高泵效,增加气井日产液量。应用结果表明,煤层气循环洗井装置和配套工艺矿场应用情况良好,可有效提高油管内的液流速度,将油管内的砂和煤粉携至地面,解决了泵卡、泵堵、泵漏,为现场控制煤粉提供了新的思路。

关键词: 煤粉, 自动循环洗井工艺, 空心杆自动洗井工艺, 泵下洗井工艺, 免修期

Abstract:

During the drainage and gas production process of coalbed methane development, due to the pressure drop, the pulverized coal is prone to appear and brought into fracturing sand. At present, the pulverized coal and the deposition of fracturing sand have become the key factors restricting the continuous and stable drainage and production of coalbed methane. As the proportion of pulverized coal pump blockage in southern Yanchuan CBM Field is high, in order to effectively reduce the occurrence of this kind of operation, prolong the maintenance free period of gas wells, ensure the continuity of the production of the gas wells and cut the operation cost, a circulating well flushing device is developed and the supporting process is formulated. After the field tests, it is clear that the automatic circulation well flushing process can effectively reduce the pump inspection times of the gas well, the hollow rod automatic circulation well flushing process can effectively prolong the maintenance-free operating period of the gas well, and the pump down well flushing process can effectively improve the pump efficiency and increase the daily liquid production of the gas wells. The application results show that the CBM circulating well flushing device and supporting process are well applied in the mine, which can effectively improve the liquid flow velocity in the oil pipe, carry the sand and pulverized coal in the oil pipe to the ground, solve the pump sticking, pump plugging and pump leakage, and provide a new idea for on-site control of pulverized coal.

Key words: pulverized coal, automatic circulation well flushing process, hollow rod automatic well flushing technology, well flushing process under pump, maintenance-free operating free period

中图分类号:

TE37

邵小平,崔彬,刘亚茹,谢昕翰,宋关伟,任立昌,徐杰华. 循环洗井工艺在延川南煤层气田的应用[J]. 油气藏评价与开发, 2022, 12(4): 651-656.

SHAO Xiaoping,CUI Bin,LIU Yaru,XIE Xinhan,SONG Guanwei,REN Lichang,XU Jiehua. Application of circulating well flushing technology in southern Yanchuan CBM Field[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(4): 651-656.

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平台	洗井数量（口）	洗井日期	洗井前检泵次数（次）	洗井后检泵次数（次）
A1	3	202010	2	3
A2	3	202010	2	3
A3	4	202010	1	3
A4	1	202010	3	0
A5	2	202006	3	0
A6	3	202007	3	3
A7	5	202006	8	3
A8	6	202010	5	1
A9	4	202007	3	2
A10	7	202004	19	11
A11	5	202010	2	1
A12	1	202008	6	2
A13	3	202010	1	1
A14	1	202010	1	1
A15	1	202010	0	1
A16	4	202006	1	1
A17	3	202010	0	4
总计	56		60	40

作业类型	上井日期	起抽日期	免修期（d）	检泵原因
新井投产	20211202	20220115
第一次检泵	20220202	20220209	18	自上而下第26根空心杆公扣顶部本体断裂,提出捞砂管柱发现：①捞砂泵以下1~19根煤粉黑水,大约0.58 m³;②捞砂笔尖以上1根油管及捞砂笔尖,煤泥及粉砂为0.03 m³
第二次检泵	20220212	20220214	3	自下而上第1根沉砂管煤泥及石英砂堵满,大约0.03 m³,第2根黑水煤糊大约0.03 m³,螺杆泵被砂子卡死转子无法拔出
第三次检泵	20220221	20220224	7	第22根上部断杆

作业类型	上井日期	起抽日期	免修期（d）	检泵原因
新井投产	20211203	20220111
检泵	20220118	20220313	7	管式泵底部固定凡尔被煤泥堵死,泵筒内有少量煤糊。油管本体及丝扣无偏磨,无腐蚀结垢现象

作业类型	上井日期	起抽日期	免修期（d）	检泵原因
新井投产	20211206	20211221
加深泵挂	20220223	20220224	64
检泵	20220301	20220304	5	管式泵筒内堵有少量压裂砂及煤泥,气锚内充满大量压裂砂

类型	冲次（次）	日产液（m³）	泵效（%）
洗井前	3.16	2.83	40
洗井后	2.00	2.80	67