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The acquisition out-of bottomhole pressure and you may temperature studies shall be organized and you can carried out in an installment-energetic styles having the very least disturbance to normal operating routines. This post talks about choices for obtaining tension and you can temperature data.
- Do you know the objectives out of aspect: static tension, reservoir dynamics, water characterization, straight pressure and you will temperatures character, better disperse characterization, and other?
- ‘s the environment openhole otherwise cased opening? A research or development really?
- Is there a significance of actual-date body readout (SRO) measurements otherwise can also be the info getting submitted downhole and you may analyzed later on?
- Exactly what metrology required toward proportions (elizabeth.grams., maximum temperatures and you will pressure, dimension resolution and precision)?
- How often brand new gauges become conveyed to your bottomhole computing facts?
- Will there be a need to perform persisted or repeated specifications more weeks or ages?
- What economics apply, and you may would it indicate a potential tradeoff toward high quality otherwise amount of the newest dimensions?
Measurements is going to be transmitted toward facial skin, constantly thru a digital cord, otherwise filed inside the downhole thoughts running on battery packs.
SRO gets the obvious advantageous asset of bringing analysis instantly. Real-day readouts are especially very theraputic for transient measurements that require big date on the tension so you can balance out and you may radial circulate to develop. While the stabilizing minutes trust reservoir and you can water attributes and since the brand new commitment ones variables is usually the purpose of tension specifications from inside the really evaluating, forecasting the size of stabilization attacks is commonly difficult. SRO is recommended in such cases.
Getting bottomhole pressure and temperatures investigation
Particular apps, always those who work in the low monetary level, are held without needing SRO. Advantages tend to be lower working can cost you and you can a fixed operations agenda. This new drawback is the difficulty of guaranteeing the caliber of the fresh new obtained research, like the potential for significant performing losings whether your bottomhole tape equipment breakdowns. Therefore, downhole tape (DHR) will likely be picked as long as the latest dimension address doesn’t always depend on stabilizing times otherwise whenever stabilizing minutes seem to be identified (age.g., to measure the average tank stress in a reservoir regarding recognized mobility).
Of many world devices render each other SRO and you will DHR. The newest calculating part of these tools is Baptist dating normal to each other selection. On the SRO alternative, the latest detector electronics are coupled to help you an excellent telemetry program to have uphole sign, therefore the wire provides downhole strength. About DHR alternative, downhole electric batteries supply electricity, plus the studies is actually stored in recollections forums for future readout or getting to help you compatible computers.
The practice of downhole shut-when you look at the while in the an accumulation take to as opposed to body sealed-during the is talked about from inside the Stress transient analysis. The many benefits of downhole shut-for the include:
- Control of this new wellbore volume (afterflow)
- Reduced total of along accumulation evaluation
- Alternatives on tape means (SRO otherwise DHR)
Downhole close-within the can be carried out while in the antique drillstem assessment (DST) or throughout tests performed on production wells. Inside the a good DST, the newest downhole closed-when you look at the valve is often the main attempt device. Shut-when you look at the is completed after a beat period by actuating the exam device. Typically buildup pressures try registered into the DHR function. Various other techniques is by using the DST device because main shut-into the valve since DataLatch electric wireline downhole recorder/transmitter can be used to see or watch demands in real time for the accumulation. DataLatch technologies are described later in this page.
When you look at the generating wells, downhole shut-when you look at the is completed from the setting a device system regarding tube prior to undertaking the exam. The fresh new tubing have to have become prior to now armed with locator hard nipples very that the valve will be secured in the suitable depth. The fresh new valve is actually run-on sometimes a great slickline carrying an effective DHR stress assess or a digital range armed with a keen SRO tape determine. Brand new close-in the valve was actuated by a sequence off pulls and you will releases toward slickline otherwise cablemonly operated shut-in the regulators can perform on the a number of as much as several open-close time periods, following this new device construction is released on the mode nipples of the the right pull-on new line. Other versions regarding sealed-within the regulators would be manage of the a-clock, small explosive squib, otherwise power.