Twin-tube small-diameter pump deep-draft extraction technology

Deep pumping oil recovery technology with double-tube small-diameter oil pump Wu Fei (Zhongyou Liaohe Oilfield Company, Panjin 124109, Liaoning, China) In response to this problem, the research and design of a new type of double-tube small-diameter oil pump was carried out. Successfully achieved good economic and social benefits. Also deepened the deep well matching process.

5:A Simplified Simplified Radial Deformation of the Pump Tube Subjected to Internal and External Pressure Differences The physical layers of the dilute oil in the Shuguang Oilfield æ›™66, Shuangbeidu 124, and other old oil reservoirs are buried deeply, and the depth of the oil layer is approximately 3,100 m. With the extension of development time, due to the poor water injection effect, only a small amount of energy is added, the formation pressure drops rapidly, and the physical properties of the oil reservoir are poor, the porosity is low, the permeability is low, the fluid seepage is slow, and it is difficult to flow into the bottom of the well. The wells have insufficient liquid supply capacity. In order to maintain a certain scale of production, combined with the actual reservoir, the main use of small pump deep pumping. However, satisfactory results have not been achieved. After the ordinary small-diameter pump has been deepened, although the degree of sinking has increased, the output still has not been significantly improved, the pump efficiency is low, and even the liquid cannot be extracted. The site needs a new and effective deep-drawing process technology to solve the problem of low-production deep well production.

1 Design basis There are certain defects in the production of deep wells due to the structure of ordinary oil pump. Because the pump is operated, the plunger and the pump cylinder are subjected to axial forces such as gravity, tail pipe gravity, and friction between the plunger and the pump cylinder. The main reason is that the plunger and the pump cylinder are subjected to the internal pressure under the action of the inner and outer hydrostatic columns of the pump. Axial force caused by external pressure. The pump cylinder and the plunger generate radial deformation due to the action of internal pressure, external pressure and axial force, and change the initial clearance value between the plunger and the pump cylinder. Especially in the case of well depth and shallow sunk conditions, the initial gap between the plunger and the pump cylinder will increase greatly, so that the gap loss during the pumping of the deep well pump will increase and the pump efficiency will decrease. Beijing: Petroleum Industry Press, 2002: edited by Fang Bei (continued from page 69) Conventional heavy oil wells can also be used in the low water cut stage.

Heavy oil reservoirs have better fluid supply conditions in the early and medium-term.

When the oil well is normally produced, wells with less than 3.0 pump strokes/min and the phenomenon of slower down of the sucker rod are more effective.

There is a hot water source for hot sewage that can be used nearby. When the pressure and temperature are insufficient, a temperature-increasing booster device can be set at the well site.

3.2 Operation at the production site 3.21 Calculation of the actual oil production in the oil reservoir 51 The water content of the oil well after the oil sample is taken is the production liquid and the mixed liquid mixed with water. This requires the sampling time, the oil time and the calculation of the amount of mixed water. The operation must be synchronized to ensure the accuracy of the oil and water metering and calculation results. At the same time, the actual oil production is calculated from the water content and the oil value of the mixture, and the actual water content of the formation is calculated using the actual oil production amount and the actual liquid production amount (the amount of oil minus the amount of mixed water).

3.22 Judging the fluid supply of the reservoir.

The amount of water added in this process is often large, and it is easy to mask the liquid supply condition of the oil layer. Therefore, in selecting wells, it is necessary to select oil wells with good oil-bearing capacity to implement this process according to the dynamic conditions of the oil layer or the production conditions of adjacent wells. In addition, one dynamometer chart should be taken every 5-10 days, and the fluid supply conditions should be judged by the continuous change of the dynamometer chart.

3 The control of the amount of mixed sewage shall be based on the liquid supply conditions of the reservoir and the specific production conditions of the well, and the amount of mixed sewage shall be properly adjusted through the regulating valve and flowmeter of the wellsite to meet the production requirements of the well.

(4) Precautions for implementation process (1) Before entering the well, ensure that the interior of the hollow sucker rod is mixed with water before starting the mixing process. The quantitative control valve shall be opened to the maximum and a cycle shall be established to establish the underground temperature field as soon as possible.

In the initial stage of pumping, the number of flushes should be reduced first, and the pumping unit should be noted for changes in the soft card and water mix. After the flow rate of the mixed water is stabilized, the flushing step is increased step by step.

4 Conclusions Production trials have proved that the heavy oil mining technology is reliable, reduces energy consumption, and improves efficiency. For heavy oil blocks with certain liquid supply capacity, it has high promotion and application value. At the same time, it can also be applied to high-condensation oil fields. For high-condensation oil wells, hollow pips can be used to add pour-point depressant to the hot sewage to make downhole crude oil depressurize to facilitate exploitation.

There is a certain scope of application for the technology of mixed-sewage water. Therefore, the well should be selected first. Before implementation, it is necessary to carefully calculate, reasonably select the combination of process parameters (pressure and temperature of hot sewage) and the correct configuration of the downhole pipe string, and determine the mixture based on the actual oil layer conditions (depth of well, viscosity of crude oil, depth of pumping, and liquid supply capacity). Liquid method (on or under the pump) to give full play to the superiority of the process technology.

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