An Integrated Sand Cleanout System by Employing Jet Pumps
Notice bibliographique
Résumé
Abstract Sand cleanout is operated by circulating a liquid or a multi-phase fluid into the wellbore to bring the sand particles to the surface. Although the sand cleanout operations have been applied successfully in most wells with high efficiency and negligible leakage, failure of effective sand removal always occurs in low pressure wells and absorption wells due to heavy loss of circulation. To make the matter worse, solids in the bottomhole may even flow back into the formation to cause further formation damage around the wellbore. In this paper, an integrated sand cleanout system has been developed to effectively remove loose sand particles in low pressure wells and absorption wells by employing a jet pump. More specifically, a high-pressure working fluid is pumped through the annulus from the surface and then divided into two parts. One part of the fluid is diverted as the sand carrier fluid to flow downwards, stir up the sand particles via a jetting nozzle at the bottom of a sand cleanout pipe, bring the loose sand particles upwards and then to be boosted by using a jet pump. The other part of the fluid acts as the power fluid of the jet pump to reduce the bottomhole pressure so that the carrier fluid together with the sand particles will be sucked into the pump and then lifted to the surface. Detailed structure and principle of the integrated sand cleanout system are described, while a theoretical model is formulated to optimally design the system based on the experiment data and jet pumping theory. It has been shown from field applications that the integrated sand cleanout system makes significant improvement in achieving high efficiency and preventing leakage in low pressure wells and absorption wells. Introduction Increasing interests and efforts have been focused on sand cleanout in the upstream oil and gas industry since 1960s[1]. Although 60% of the oil and gas reserves are discovered in carbonate reservoirs, approximately 90% of the world's oil and gas wells are drilled in sandstone reservoirs, among which 25 to 35% of the wells experience certain degree of sand production during the life of the well[2]. In principle, sand particles are dragged by the formation fluids, carried out from the formation and settled down at the bottom of the well. By the time the casing is full of the sedimentary solids, the pay zone becomes plugged and the downhole pump gets stuck, workover activities have to be carried out for reviving the well back into production[3]. Frequently, wellbore fill removal is considered inadequate, leaving large quantities of fill material (e.g., sand particles) in the well, which often requires repeating well cleanouts in a relatively short time interval. In addition, wellbore cleanouts are extremely time-consuming, preventing timely return of wells to production and increasing the cost of well maintenance[4].
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Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,000 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,001 | 0,001 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,001 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
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