长柱塞防砂卡抽油泵内筒与外筒之间有一个环空沉砂通道，沉砂可沿此通道进入尾管，而且柱塞在油井生产中始终有一部分外露于泵筒，可防止沉砂进入柱塞与泵筒之间的间隙。现场19口井次的应用表明，在出砂量小于1％的油井中可直接下泵生产，能保证油井在生产过程中或停抽后不会砂卡或砂埋柱塞。在出砂量大于1％的油井中可先进行化学防砂，再下入防砂泵，能有效地延长防砂后油井的免修期。由于这种泵具有防砂卡、防砂埋及耐磨蚀三个功能，可有效地解决出砂油井生产周期短、吨油生产成本高的问题。但这种泵存在检泵时无法泄油的问题，增加了作业施工工作量，同时造成环境污染。 Long plunger sand control card pump between the inner cylinder and the outer cylinder has an annular grit channel, grit can enter the tail pipe along this channel, and the plunger in the production of oil wells has always been part of the exposure to the pump cylinder to prevent Shen Sand enters the gap between the plunger and the pump barrel. The application of 19 wells in the field shows that the pump can be directly produced under the oil well of less than 1% of sand production, which can ensure that the oil well will not block the sand card or sand during the production process or stop pumping. In sand production of more than 1% of the wells can be chemical anti-sand, and then into the sand control pump, which can effectively extend the anti-sand oil-free repair period. Because of this pump with sand control card, sand buried and abrasion resistance of the three functions, which can effectively solve the short production cycle of sand production wells, tons of oil production cost is high. However, this pump has the problem of being unable to drain oil when the pump is seized, which increases the construction workload and causes environmental pollution.