Method of operation of a well jet device in well testing and...

F - Mech Eng,Light,Heat,Weapons – 04 – F

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F04F 5/54 (2006.01) F04F 5/10 (2006.01) F04F 5/44 (2006.01)

Patent

CA 2445787

The invention relates to jet device used for extracting oil from wells. The inventive method consists in the following: a pump, a connecting and disconnecting unit, a valve unit, a packer and a shank are mounted on a tubing string before actuating the inventive device. A perforator is run into the well on a mounting seat in the pass channel of the pump, the packer being released. Differential pressure being produced, the perforator is blasted against the productive stratum which is then drained. The perforator being replaced by the transmitter and receiver-transducer of physical fields, the stratum is studied while the pump operates. Said transmitter and receiver- transducer being pulled from the well, a valve chamber and a blocking insert separating the cavity of the tubing string from environment are thrown into the well. The well starts to work in a natural flow regime. When the production rate decreases, the well is suspended, the blocking insert is substituted by a depression insert provided with a manometer and a debitometer and the well production is measured while fluids are pumped out. The flow rate- bottomhole pressure graph is plotted according to indications of instruments and interpreted, thereby defining the sizes of a pump. The required pump is run into the well along the tubing string and the well is put into operation by a power method. The invention is directed to improve reliability of the operation of said device.

L'invention relève des installations à jet destinées à l'extraction du pétrole de puits. Avant d'effectuer la descente, on installe sur la colonne de tiges une pompe, une unité d'accouplement et de désaccouplement, une unité de soupapes, une packer et une queue. Après avoir libéré le packer, on fait descendre dans le puits, jusqu'au siège prévu dans le passage de la pompe, un perforateur suspendu à un câble. On crée une dépression dans la couche productrice, on enfouit le perforateur en face de la couche productrice et l'on effectue le drainage de la couche. On remplace ensuite le perforateur par un émetteur et un récepteur / transducteur de champs physiques et on examine la couche tout en laissant tourner la pompe puis on retire ces dispositifs et on fait tomber dans le puits une boîte à soupape et un insert de blocage qui sépare la cavité de la colonne de tiges et l'espace environnant puis on laisse fonctionner le puits par jaillissement. En cas de baisse de débit, on obture le puits, on remplace l'insert de blocage par un insert de dépression comprenant un manomètre et un débitmètre, et l'on mesure les valeurs de débit du puits lors de l'évacuation du fluide par pompage. En se fondant sur les indications des instruments on trace un graphique de la relation entre le débit et la pression dans le puits et, en interprétant cette relation, on détermine le type et les cotes de la pompe. Au moyen de la colonne de tiges, on fait descendre la pompe appropriée, qui a le type et les cotes désirés, puis on relance le puits en mode d'extraction forcée. L'invention vise à augmenter la fiabilité de fonctionnement de l'appareil.

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