The way to increase the efficiency of development gazokondensatnogo deposits in the region with poor transport infrastructure

 

(57) Abstract:

The invention relates to the field of production of liquid and gaseous fluid from wells, and in particular to methods for the production of hydrocarbons with subsequent separation extracted from the wells of materials, and may find application in the field of preparation and transportation of hydrocarbons in the development of gas condensate and gazokondensatnyh fields. The technical result of the invention is the provision of a broad fraction of volatile hydrocarbons (C2+C3+C4in commercial products and delivering them to the consumer. This is achieved as follows. Extracted from the hive wells and collected locally paragraph layered gas-liquid mixture is cleaned from solid, liquid and gaseous impurities and separated into two phases: liquid (fraction C5and above or stable condensate) and gas (methane-butane fraction C1+C2+C3+C4). The liquid phase stabilized by degassing and pumped into the pipeline. The gas phase oosevelt and divided into methane (C1and a wide fraction of volatile hydrocarbons - NGL (fraction C2+C3+C4). Methane is injected into the trunk g is POTREBITEL methane-butane mixture, if necessary, into fractions and components.

The present invention relates to the field of production of liquid and gaseous fluid from wells, and in particular to methods for the production of hydrocarbons with subsequent separation extracted from the wells of materials, and may find application in the field of preparation and transportation of hydrocarbons in the development of gas condensate and gazokondensatnyh fields.

It is well known that extracted from reservoirs gazokondensatnogo field gas-liquid mixture (hereinafter SHC) consists of a wide range of gaseous and liquid hydrocarbons and solid, liquid and gaseous contaminants. To this mixture to allocate goods and deliver it to the consumer, stratiform SHC subjected to commercial processing (preparation), i.e. clear of solid, liquid and gaseous contaminants, divided into phases and fractions, then hydrocarbons obtained by known methods is transported to the consumer. The choice of method field treatment of gas and condensate for transport and transport is determined by a number of factors, the main of which are the geological, geographical and climatic conditions of the Deposit, the material composition of the current output of marketable products and provide high quality and low cost of hydrocarbons, consequently, its competitiveness on the domestic and foreign markets.

In the literature quite extensively discussed the development of the gas condensate and gazokondensatnyh deposits (hereinafter - SCS field), extraction and processing of hydrocarbon raw materials, transport it to the consumer [1, 2]. Extracted and collected from a group of wells stratiform SHC clear of solid particles, water and other impurities. Then the methane-ethane mixture (fraction 1+ C2) is separated from the condensate, additionally cleaned from solid and liquid particles, dried and sent to the main pipeline. The condensate fraction C3and above) first advocated in the water separator, then passed through a special separators (to maintain the required pressure and is injected into the pipeline through which the condensate under its own pressure is transported to the consumer. In the absence of the field of condensate condensate delivered to the customer land (rail, road or water transport. To this end, the condensate is separated into a liquid phase (fraction C5and above, i.e., stable condensate) and gas phase (propane-butane Fraction C3sat through capacitors are directed to the storage tank, of which is filling tanks ground or water transport for delivery to the consumer.

Set out the method of processing and transportation of hydrocarbons GKN Deposit has a significant drawback - a mandatory condition for its implementation is available on the fishery of condensate, or gas in the region should be sufficiently well developed transport infrastructure. However, not all these conditions. Suffice it to say that in Russia there are more than 300 GKN fields located in regions of unfavorable from the point of view of transport of hydrocarbons in industrial centers. For example, the group Vasyugan GKN fields in the Tomsk region (myldzhinskoe, North-Vasyugan and others) do not have a pipeline linking the field with consumers - Tomsk petrochemical plant and CHP-3. Construction of the pipeline Meljine-Tomsk length of 530-600 km would cost the Tomskgazprom about 400-500 million. US that in the current economic conditions is unrealistic. There is no possibility for delivery of condensate, Tomsk ground transport. This is due to the fact that the Northern districts of the region are strongly Zabolotny by also excluded, as available in the field area of a small river is navigable only 1-1,5 months out of the year.

In this regard, "TomskNIPIneft" has developed the project of development of nylginskogo GKN field, the essence of which is as follows [3]. This project and adopted us for the prototype. Extracted from well pads and collected on cluster collection point stratiform SHC handle on the complex gas treatment plants, treatment plants and installations differential separation of mixture components (UDSC). At these facilities by known technologies stratiform SHC clear of solid particles, water and other impurities and is divided into phases and fractions: liquid phase (fraction C5and above, or stable condensate), gas methane (C1) and fraction C2+ C3+ C4or a wide fraction of volatile hydrocarbons (hereinafter - NGL). After appropriate processing of stable condensate (fraction C5and above) is injected into the pipeline, and drained the gas (C1) served in the main pipeline and NGL in the field of pipeline and delivered to the consumer by land or water is pumped into reservoirs of the field.

Obviously, a significant drawback of those is + C4) - energy fuels and valuable raw materials for the chemical industry. First, Tomskgazprom suffers huge losses from the fact that about 300 thousand tons of valuable hydrocarbons is withdrawn from commercial products. Secondly, the injection of LPG in reservoir deposits associated with significant energy consumption. Thirdly, in case of loss of unstable condensate in the well bottom hole in the liquid phase is sharply reduced the rate of producing wells, and these wells can completely stop issuing condensate.

The task: in the absence of at GKN field of condensate, surface roads and waterways to ensure the inclusion of a broad fraction of volatile hydrocarbons (fraction C2+ C3+ C4in commercial products and delivering them to the consumer.

This task is solved as follows. Extracted from the hive wells and collected on sectional collection point stratiform SHC clear of solid particles, water and other impurities and is divided into two phases - liquid and gaseous. The liquid phase (fraction C5and above) is subjected to degassing and pumped into the pipeline. The gas phase (methane-butane fraction C1+ C2+ C3 in the main pipeline. NGL drossellied in the same pipeline. When entering the consumer gas mixture is optionally separated into fractions and components.

The order of implementation of the proposed technical solutions are shown in the following example. GKN field drilled bushes wells. Each of the bushes consists of six peripheral wells, revealing the reservoir in the corners of the hexagon, and one Central injection well. In the process of development of the producing wells is sampled formation of SHC, which trains arrives at the cluster Assembly point. Collected at the hive produced SHC is processed by the installation of complex gas treatment plant (GTP), where it is purified of solid, liquid and gaseous impurities and is divided into two phases: liquid (fraction C5and above or stable condensate) and gas (methane-butane fraction (C1+ C2+ C3+ C4). The liquid phase stabilized by degassing and pumped into the pipeline. The gas phase is additionally clear of solid and liquid particles, in particular from higher hydrocarbons, oosevelt with a dew point of water vapor below the minimum operating temperature, and a section of the od and NGL stabilize by throttling in the vortex tube and is served in the main pipeline (this method of stabilization is based on a vortex effect, described in the paper by A. P. Merkulova "Vortex effect and its application in engineering", M.: engineering, 1969). Received consumer gas mixture by low-temperature separation or absorption method is divided into methane (C1and NGL (fraction C2+ C3+ C4) or fraction methane-ethane (C1+ C2) and propane-butane (C3+ C4). If the gas mixture suitable for combustion in heat and power stations, it's faction is not divided.

Compared with the prototype of the proposed solution has the following advantages:

without exception, all extracted from GKN deposits of hydrocarbons are commodity products that are delivered via pipeline;

excludes energy costs associated with pumping of liquids in the reservoir field;

increases the reliability and stability of production wells;

there is no need for the construction of the pipeline, which significantly reduces the financial, material, labor and other Preparation of natural gas and condensate for transport. M.: Nedra, 1968, S. 140.

2. N. G. Sereda and other Satellites oilman and Gazovik. The Handbook. M.: Nedra, 1986, S. 288.

3. The project pilot operation nylginskogo gazokondensatnogo field. Tomsk, "TomskNIPIneft", 1996, S. 363.

The way to increase the efficiency of development gazokondensatnogo deposits in the region with poor transport infrastructure, which is extracted from wells and collected at the point of collection layered gas-liquid mixture is cleaned from solid, liquid and gaseous impurities and separated into a liquid phase (fraction C5and above) and gas phase (methane-butane mixture C1+C2+C3+C4), and the liquid phase rangatira and pumped into the pipeline, characterized in that the gas phase additionally oosevelt with a dew point of water vapor below the minimum operating temperature and separated into methane (C1and a wide fraction of volatile hydrocarbons (C2+C3+C4), while the methane is injected into the pipeline, and a wide fraction of volatile hydrocarbons stabilized by throttling in the pipeline through which the gas mixture Tran

 

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