Use of skid-mounted equipment in edge wells

2 The market for natural gas recovery is located in the southeast of Wensu County, about 90km in the Aksu area, about 120km from Aksu and about 50km from Xinhe County. The gas supply source in Aksu and Wensu County is treated by Yingmaili Oil and Gas Processing Plant. The dry gas, the pre-supply mode is the CNG gas supply mode. As the gas consumption increases, it is proposed to use the pipeline gas supply. At present, there are 11 gas-filled substations in the 150-kilometer radius of the well area, including 2 gas station stations in Xinhe County, 4 gas stations in Aksu, and 3 gas stations in Wensu County. The CNG tanker is supplied by gas, and the daily gas filling capacity of the substation is about 8×10 4 Nm 3/d. In addition, the Yingbu Oil and Gas Processing Plant has a degassing station. The natural gas pumped by the CNG tank truck can be unloaded. After decompression, the station enters the oil and gas processing plant, and the treated natural gas is concentrated and exported.

However, the Lejing District is on the edge of the Dabei Gas Field and the Yingbu Gas Field Group. The gas-consuming natural gas on the gas field has two major categories of production and domestic gas, and all of them are treated with dry gas. The gas for production is the fuel gas for the wellhead heating furnace, the gas for the gas generator set and the gas for the surrounding oil and gas field service well team transportation. The domestic gas mainly refers to the gas used in the living base.

It can be seen from the above analysis that the natural gas recovered from the Lejing District can be imported into the external gas pipeline through the unloading station already built by the Yingbu Oil and Gas Processing Plant, and can also be used as the fuel gas of the gas well heating furnace. The well team service base is used as fuel for vehicles and generators. It can also be used as an effective supplement for fuel gas for gas generators in peripheral gas stations and urban gas supply and oil field surrounding drilling teams. The market flexibility is very large and it is convenient to adjust.

3 Skid-mounted equipment processing scale However, there are 2 edge wells in Leijing District, namely QL1 and QL102 wells, QL1 well was completed in January 2002; QL102 well was completed in June 2006.

According to the change trend of production data in the Qilejing District, the gas production range of QL1 well is 1.5～3.0×10 4 Nm 3/d, and the gas production range of Well QL102 well is 2.1～4.0×10 4 Nm 3/d, and it is decreasing year by year. Wellhead pressure fluctuation range: 4.2～5.8MPa. Since the process equipment is movable according to skid-mounted, it is required that the skid-mounted equipment process must have strong adaptability, large operational flexibility, mobility, investment and operation cost. Low characteristics. According to the gas volume change trend of the Chale gas well, combined with the single well gas production of the Tarim oil and gas field test production well and the edge well, the design and treatment scale of the device is set at 5.0×10 4 Nm 3/d.

4 The choice of recycling process The depth of natural gas treatment is determined by the downstream market, and the type of product directly determines the complexity of the process. According to the characteristics of edge wells, trial production wells, low pressure, rapid decline, and gas source dispersion, It is necessary to consider the economic benefits of the treated product gas, and to facilitate flexible deployment. Considering the CNG recovery technology, the key points of the CNG recovery technology are the dew point (dehydration, dehydrogenation depth) and pressure (compressor boost).

According to the standard requirements of “Compressed Natural Gas for Vehicles”, the natural gas dew point should be 5 degrees lower than the local use environment in the driving geographical area. Under the operating pressure and temperature, there should be no liquid hydrocarbons. The winter climate in Xinjiang is cold and the temperature is low. From the calculation, the natural gas water dew point of the raw material in Lejing District is 10 °C, which needs to be dehydrated and dehydrogenated. In order to meet the requirements of compressed natural gas for vehicles, the molecular sieve can be used for deep dewatering to meet the requirements of use, because it is located in QL1. QL102 wellhead pressure is low, no pressure can be utilized, dehydrogenation adopts external cooling process, refrigerant adopts R404A which is non-polluting to ozone layer. In order to adapt to gas instability, supercharger selects reciprocating natural gas compressor with variable working condition The treated natural gas is pumped to the gas point or pipe network through the CNG tank truck.

5 Process equipment group skid project According to the determined process flow, the powerful PDSOFT 3D drawing software is used for group sled piping design and factory assembly productization. For transportation and relocation, the sled body width is controlled within 2.5m, and the height is controlled. Below 4m, there are five skids, which are pre-treatment skid, dewatering skid, refrigeration dehydrogenation skid, mixed hydrocarbon storage tank and loading skid, natural gas compressor skid, natural gas generator skid. Among them, the natural gas compressor skid and the power generation skid are provided by the supplier group skid. Unless otherwise described, only the main equipment and functions of the self-group sled of the project are described.

1) Pretreatment skid: It mainly filters and separates the droplets carried by the raw material gas to ensure the smooth operation of the downstream dewatering skid. The filtered and separated natural gas passes through the pressure regulation and metering and then enters the dewatering skid. The equipment contained in the skid has filtration separation. 1 set, 1 set of pressure regulating and measuring facilities.

2) Dewatering skid: dewatering adopts solid adsorption dehydration, adsorbent adopts 4A molecular sieve, two towers operate (regeneration and adsorption), and regeneration gas adopts closed self-circulation mode to reduce the energy consumption of regeneration gas. The skid contains two towers, Regeneration gas circulation compressor, electric heater.

3) Refrigeration dehydrogenation skid: refrigeration and separation, the refrigeration compressor uses a rotary screw compressor, the refrigerant uses environmentally friendly R404A, after dehydration, the natural gas and the evaporator exchange heat and enter the cryogenic separator to separate the light hydrocarbons. After reheating with the raw material gas, it goes to the compressor inlet. The skid includes a refrigeration compressor, an air cooler, a refrigerant storage tank, a cryogenic separator, and a plate-fin type multi-stream heat exchanger, so as to avoid the influence of compressor vibration on the heat exchanger welding. Spot welding, refrigeration compressor, air cooler, refrigerant storage tank and heat exchange, separation facilities are separated into sleds.

4) Mixed hydrocarbon storage tanks and loading skis: pre-treatment separation sleds and refrigeration dehydrogenation skids are sent to the mixed hydrocarbon storage tanks. The tanks are equipped with heating and stabilization facilities, which are simple and stable for mixed hydrocarbons. No. Light hydrocarbon requirements can be transported by liquefied gas tanker. The skid contains 20 tanks and 2 liquefied petroleum gas pumps. The light hydrocarbon fractionation recovery interface is reserved for further separation and increased product added value.

6 Project Investment and Economy The project adopts 3D software drawing and skid block design, which can be prefabricated by factory, reducing the procurement and construction period, which is one and a half months shorter than the estimated construction period. Since the project was put into operation in December 2009, The average natural gas recovery is about 6×10 4 Nm 3/d, and the mixed hydrocarbon is 1.2 tons/d. The energy consumption of the project is mainly electricity consumption and product transportation energy consumption. The electricity used in this project is generated by a gas-fired generator, and the transportation vehicle is made of CNG natural gas. fuel. Therefore, the production cost is mainly the cost of raw material gas, the salary of management and operation personnel and the depreciation of fixed assets. The cost of raw material gas is 0.25 yuan/m 3 , the average sales volume is 1.2 yuan/m 3 , and the annual sales income is about 20.294 million yuan. 330 days calculation), management, operation, transportation, logistics personnel calculated by 25 people, the average salary is 3,000 yuan / month, the average annual total cost of production during the production period of 6.5 million yuan (including wages and benefits, manufacturing costs, repair costs, other manufacturing costs , management costs), if the gas well production declines slowly, and the production is relatively stable, the full investment can be recovered within 3 years.

7 Conclusion

The Tarim Basin is one of the largest inland basins in the world with a total area of ​​56×10 4 km 2 and is divided into seven sub-tectonic units: the Tabei Uplift, the Central Uplift, the Tanan Uplift, the Kuqa Depression, and the Northern In the depression, southwest depression and southeast depression, oil and natural gas resources are abundant. There are many edge wells, scattered wells and small sealed gas wells in the early and middle stages of gas field development, and the recycling potential is large. This paper adopts the CNG process technology in the Chaering area and the recovery of the venting natural gas by the wellhead equipment skid block method. It has the characteristics of short construction period, mobility, strong product sales flexibility, low engineering investment risk and significant economic benefits. In the domestic oil and gas fields, the marginal wells and scattered wells with low production, low pressure and short production cycle are used for venting natural gas recovery. For the full utilization of resources, the implementation of long-term national policies for energy conservation and emission reduction, and the search for new development ideas, and improving the comprehensive benefits of gas field development. Can play an open mind and a certain reference.

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