RU2181446C1 - Method of recovery, gathering and utilization of methane and other hydrocarbon gases from coal deposits - Google Patents

Abstract

FIELD: operation of oil, gas, coal and peat deposits. SUBSTANCE: method includes tapping of deposit, perforation of wells in zone of coal seam and connection by gas gathering collector. Low- potential gas is supplied to ejector in which gas pressure is built-up. Used in ejector is active working agent. Recommendations are given for selection of equipment and substances for working agent. Energy of recovered product is stabilized, and harmful ejection into atmosphere is reduced. EFFECT: higher efficiency. 5 cl, 1 dwg

Description

 The invention relates to the exploitation of oil, gas, coal deposits and peat deposits.

 In the oil, gas, chemical and oil and gas processing industries, gas, liquid-gas, gas-liquid and gas-vapor ejection (collection and disposal) of low-grade gas are widely used. The essence of the above methods is that a high-potential working agent (gas, liquid, steam), passing through the ejector, absorbs low-potential gas, increases its pressure, which is then separated and sent to the consumer or to the torch (burned) - RU 2016267 C1 ( prototype).

 The disadvantage of these methods is the instability of the energy of the working agent, leading to an uncontrolled process of utilization of low potential gas and emissions into the atmosphere, as well as the high cost of the equipment used.

 The invention solves the problem of controllability of the production, collection and utilization of low-grade gas from a coal seam, improving the environmental situation and ensuring the safety of coal mining.

 The technical result achieved in this case is stabilization of the energy of the working agent and reduction of harmful emissions into the atmosphere.

 It is proposed in order to ensure the safety of the development of coal seams during the extraction and collection of methane and other hydrocarbon gases, to use coiled tubing drilling with hydraulic drills and opening the formation with special hydro sandblasting nozzles that can perforate to great depths from the axis of the well, drill horizontal workings in the reservoir using long, lengthless couplings pressure, to develop spherical and slotted volumes and other types of channels in the face.

 After well development, methane and other hydrocarbon gases are collected using special ejectors using glandless hydraulic centrifugal pumps with an active working agent - an inhibitor (money, calcium chloride, methanol, etc.), if necessary, to dry the gas before delivery to the consumer. If there is no need to dry the gas, water is used as the active working agent.

 The invention is illustrated by graphic material, which presents a diagram of the production, collection and disposal of hydrocarbon gases, for example, from a coal seam.

 The coal seam (1) is opened by drilling wells (2), after which the seam (1) is perforated over long distances from the axes of the wells.

 Perforation of the formation (1) is performed by multi-channel (13), ball (14), slotted (15) or with a free face (16). In addition, inclined horizontal opening and perforation (17) of the formation (1) is possible. The wells are connected by a low-potential gas collector (3), and the collector (3), in turn, is connected through a ejector (4) to a horizontal gas pipe separation device (6). The device (6) through pipelines (9) is connected with a drainage tank (11) for an active working agent. If necessary, a regeneration unit for the working agent is provided (10). The hydraulic pump (5) ensures the operation of the ejector (4), feeding the active working agent from the drainage tank (11) through the pipeline (12).

 Gas from wells (2) drilled into a coal seam (1) and opened by various methods (13, 14, 15, 16, 17) enters the common reservoir due to suction by an ejector (4) due to the operation of a centrifugal hydraulic pump (5) with an active working agent coming from the tank (11), in which it accumulates as it arrives from the horizontal in-tube gas separation device (6) through pipelines (9). If it is necessary to regenerate the working agent (inhibitor), a regeneration unit (10) is provided, then the liquid enters the tank (11) from there. In this case, an increase in pressure of the low-grade gas occurs.

 Separated, partially drained and compromised to the required pressure and ready for use, methane and other gases enter the metering unit (7), then through the pipeline (8) to the consumer.

The proposed method differs from existing methods for collecting low-grade gas:
- use in drilling a hydraulic drill with special nozzles;
- opening the coal seam at the same time as the intensification of gas inflow;
- the use of sandblasting perforation with special nozzles when opening a coal seam;
- the use of conventional centrifugal pumps to collect and simultaneously dry low-grade gas before supplying the consumer, as well as increasing the pressure of the collected gas to the required parameters for the consumer;
- profitability;
- environmental friendliness.

Sources of information
1. The method of opening layers using special nozzles. Patents: 2078911, 2078912.

 2. Certificate for utility model 17942 dated May 10, 2000.

 3. Application for jet nozzle 2000114867/03 (016105) dated June 14, 2000.

 4. The method of drilling with a hydraulic drill. Application 2001100747/3 (000660) dated 12/27/2000

 5. A method of collecting, preparing and disposing of low-grade gas. Patent 2016267.

 6. Device for in-line gas separation. Copyright certificate 1554198 dated December 1, 1989

Claims (5)

 1. The method of extraction, collection and disposal of methane and other hydrocarbon gases, which consists in the extraction of coal from a coal field, the collection and supply of gas, increasing its pressure using a working agent in a liquid-gas ejector, separation and removal of commercial gas, characterized in that intensify the flow of gas from the field, which perforate the wells in the zone of the coal seam, connect the latter with a collector and supply gas to the liquid-gas ejector, using an active working agent, which after the in-line sep radios enters the drainage tank or is pre-regenerated, and an inhibitor or water is used as the active working agent.  2. The method according to p. 1, characterized in that the inhibitor is used money, or calcium chloride, or methanol.  3. The method according to p. 1, characterized in that the wells of a coal field are multi-channel. ball, slotted, with a free face or an inclined horizontal opening.  4. The method according to p. 1 or 3, characterized in that when drilling a field, coiled tubing pipes with a hydraulic drill and hydraulic sanding nozzles are used.  5. The method according to p. 1, characterized in that when collecting gas and increasing its pressure use glandless hydraulic centrifugal pumps.