. Why do pumps frequently stick at the wellhead?
In production of wells with high sand content, oil well pumps can experience plunger sticking and severe seal wear, impacting well production efficiency and equipment life. Conventional oil well pump designs have a short service life in sandy environments. To address this issue, we have developed a long plunger sand control pump. Below, we will provide a detailed analysis of the long plunger sand control pump.
2. Technical causes of pump sticking caused by sand contamination:
The root causes of this problem are mainly due to two aspects:
Sand Abrasion: Sand enters the pump barrel-plunger gap, causing severe wear and even "locking."
Sand Backflow Accumulation: Sand backflow occurs when sand-laden crude oil is stopped or throttled, causing blockage in the pump barrel.
3. How does a long plungersand control pump work?
The design concept of our Dongsheng long plunger sand control pump is to actively move sand away from the working chamber, rather than blocking it.
The structure of the long plunger sand control pump is briefly described below:
Long plunger: Increases stroke length, prolongs pumping time, and expands the guide area.
Short pump barrel: Shortens the sealing area, reducing the amount of sand entering the friction zone.
Sand settling chamber design: Expands the lower space of the pump body to guide sand to settle in the tailpiece.
Limited guide device: Prevents the plunger from hitting the pump bottom, ensuring it always operates in the non-sand settling area.
Material: Key components utilize nickel-based alloy/tungsten carbide coating for enhanced wear resistance.
4. How does the long plunger sand control pump differ from traditional oil well pumps?
Comparison Items: Traditional oil well pumps; Long plunger pumps
Sand control capability: No special design; Structure guides sand settling and prevents pump sticking
Plunger/barrel length ratio: Short plunger/long pump barrel; Long plunger/short pump barrel
Applicable conditions: Clean wells, low sand content; High sand content, wells with frequent sand return
Service life: 1-3 months; 3-6 months, some exceeding 200 days
Maintenance cycle: Frequent; Reduces workover frequency
5. Real-world field data feedback?
| Comparison Parameters | Traditional oil well pump | Long plunger pump structure |
| Sand Resistance | No special design | Structure guides sand settling and prevents pump sticking |
| Plunger/Barrel Length Ratio | Short plunger/long pump barrel | Long plunger/short pump barrel. |
| Applicable Operating Conditions | Clean well, low sand content | High sand content and frequent sand return in wells |
| Service Life | 1-3 months | 3-6 months, sometimes exceeding 200 days |
| Maintenance Cycle | Frequent | Reduced well repair frequency |
6. What operating conditions are suitable for this type of pump?
Sand content > 0.5%, with large fluctuations, and occasional sand plugging.
Remote oil fields with high workover costs. Severe sedimentation in sandstone wells, heavy oil wells, and marginal water wells.
Scenarios where you want to reduce on-site inspections and extend pump life.
7. FAQ:
Q1: Why not use a filter for sand control?
A: A filter can reduce the entry of large particles into the pump body, but it cannot prevent long-term wear from fine sand. The structure itself still needs to be optimized.
Q2: Will extending the plunger affect pump efficiency?
A: No. For specific wells, it can improve stroke efficiency appropriately.
Q3: How can I determine whether a long plunger sand control pump is suitable?
A: This can be determined based on data such as the sand content of the well, the frequency of workovers, and the location of wear on the original pump.
The long-term performance of a long plunger sand control pump depends not only on the material but also on the understanding of the site's challenges in the structural design. For sand-laden wells, this long plunger sand control pump offers a better solution to the root cause of the structural issues rather than frequent pump replacements. If you have specific well parameters, we can provide matching recommendations, sample structural diagrams, and technical support.