Wellbore Temperature Field Analysis and Equipment Selection for Ultra-deep and Super-heavy Electric Pump in Tahe Oilfield

3. China University of Petroleum (Beijing), Beijing, Changping, 102200) Schematic diagram of annular oil-admixed thinning process for electric submersibles The schematic diagram of the temperature distribution of wellbore wells of electric submersible pumps has been widely used, but due to complicated and variable flow patterns in the wellbore, in later use Various problems have emerged, resulting in high well-laying rate. This article analyzed the application status of Li-li in Tahe oilfield. Based on the existing problems in the field, the theoretical model was used to simulate and calculate the electric field of Lilijing wellbore well. The actual data of the site was compared and analyzed to guide the optimization of the field equipment.

Analysis of the application status of Type 1 electric pump in Peihe Oilfield The Ordovician fracture-cavity carbonate reservoir in Peihe Oilfield is highly heterogeneous with ultra-deep, super-thick, high-density, high-viscosity, and high-grade. The characteristics of “two super three highs” of asphaltenes, high hydrogen sulfide, and high salinity, the well conditions are extremely complex, and the submersible pump deep extraction technology with unique properties has been widely used in the Pehe Oilfield. Due to the thick oil and poor fluidity, heavy oil wells need to be mixed with dilute production. Therefore, the following requirements have been put forward for the selection of mechanical lifting methods: On the one hand, the depth of the lower pump must meet the requirements for heavy oil pumping; on the other hand, large displacement is required to meet the requirements of the production and Dilution capacity requirements; and the electric submersible pump has the following features compared to other methods: First, the depth of the pump is large (up to 3500m); Second, the large displacement (30-400 square / day, the third is the electric pump High-speed rotation can play a role in mixing heavy rare oil, and can stabilize production.Fourthly, compared with rod pump with low ratio of diluting and adjustment, it is convenient for electric pump well to become the main machinery in heavy oil section of Pehe Oilfield. Lifting method: In 2011, there were 103 wells of electric pump wells in the second oil extraction plant, and the annual rate of lying 9.5%. From the failure position of the electric pump lying well, the lying wells caused by cable faults and motor faults each accounted for 34% of the total lying wells, motor cable faults accounted for 18.4%, and mechanical faults accounted for 13.6%. Reasons for lying on the well of the electric pump, the adaptability of the cable and electric pump unit accounted for 689%, the mechanical failure caused by the quality of the electric pump and the design and manufacture of the pump accounted for 136%, and the operation quality, cable connection quality, water injection, generator, rain Controlled factors such as SNOW weather and cable theft accounted for 17.5%. It can be seen that the reason for lying the well of the electric pump well in No. 2 oil production plant is that the inadaptability of the cable and the electric motor and the electric pump to the oil well is the main reason leading to the lying of the electric pump well. Therefore, it is necessary to analyze the production parameters of oil wells and the temperature field and pressure field of the electric pump wells. Through optimization and selection, the pump type and the cable motor are reasonably matched to find the best working environment suitable for electric pump well production. Guide actual production.

From the engineering technology 2.1 oil layer to the depth of the bottom of the motor (AB segment), the fluid flows from the formation to the manhole and rises to the bottom of the motor by its own energy along the wellbore. The fluid radiates heat to the surrounding formation and its temperature gradually decreases. After fetching the microelement and solving For the differential equation, the following temperature formula is obtained: 2.5 The heat balance equation of the fluid from the hydraulic fluid surface to the wellhead of the hydraulic fluid surface to the wellhead section (EF section) is basically the same as that at the pump outlet to the hydraulic fluid surface. The only difference is that the fluid Above the surface, the medium in the oil jacket annular space is a gas, not a mixed liquid, resulting in a different total heat transfer coefficient from the oil tube to the formation. The temperature at the wellhead position F is: 2 Electric pump well shaft temperature field analysis Tahe oil field The production of electric pump wells is mainly based on the production of casing diluting and tubing production. At the same time, due to electric pump work, there is a step change in the temperature of the electric pump.

In addition to establishing the wellbore temperature distribution model of the electric pump well, the influence of heat generated by the motor and cable on the fluid temperature of the wellbore was considered, such as Wang Yonghui, Tan Chaodong, etc. The effect of heating of the submersible electric pump system on viscosity of the heavy oil was considered. Petroleum mine machinery, 2011,8,58~61. Xie Shaolan, Xue Xingyan, Peng Yuhua, etc., Comparative analysis of thickened oil wellbore thinning and viscosity reducing methods, China Petroleum and Chemical Industry, 2010, 1:65-67. Wang Jiexiang et al. Wellbore temperature distribution model establishment Table 4-2 Electric pump well fluid temperature monitoring data of Tahe Oilfield Well-numbered sounding m Measured temperature °C Wellhead temperature ° Contrast temperature gradient Theoretical calculation Temperature °C Error analysis Mean error Measured flow temperature at the site Comparing the data with theoretical model data, we can see that the average error between the calculated value and the measured value is 2.36%, which is in accordance with the field requirements. This model is suitable for the temperature field analysis of the electric pump well in Tahe Oilfield. At the same time, it can be seen that the temperature of the electric pump wellbore exceeds 120C, while the cable and motor temperature rating (90-120C) currently used in Peihe Oilfield is relatively low, and most of the motor's plastics are resistant to high temperature and resistance to hydrogen sulfide corrosion. After the glue is applied quickly. Journal of the University of Petroleum: Natural Science Edition, 2003, 27(5): Oil and Gas University (Beijing), specializing in oil and gas field development engineering. Now the Engineering Institute of the Northwest Oilfield Branch of Sinopec is engaged in research and promotion of mechanical oil recovery. S3

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