RU2110673C1 - Method and ejecting device for operation of clustered gas wells - Google Patents

Abstract

FIELD: gas production industry. SUBSTANCE: this relates to intensification of gas recovery from wells and ensures increased total output of gas wells of various productive capacity at minimal spending of gas bed energy. According to method, connection of low-output well and high-output well is effected with help of their contours. This is performed through ejector. Operation of wells is carried out with ejection of low-pressure gas by high-pressure gas. In this case, wells are additionally connected according to by-pass scheme. Performed is stabilization of pressure in contours. Pressure at well head is fixed. After that, wells are switched from by-pass scheme of operation to ejector operation and additional depression is created at bottom-hole of low-output well. Additional depression is obtained so as to ensure pressure differential in contours at inlet to ejecting device not over 5% of its nominal values. Device for realization of aforesaid method has receiving chamber and mixing chamber with contraction. Receiving chamber is made with tangential inlet, nozzle which is located inside, and narrowing tapered component. This components creates intermediate chamber inside receiving chamber. Intermediate chamber is connected with diffuser. All this is made for possible dispersing of liquid which accompanies gas. EFFECT: higher efficiency. 1 cl, 2 dwg

Description

 The invention relates to the gas industry, in particular to methods for intensifying the selection of gas from wells.

 A known method of operating cluster wells, which is carried out according to the regime of regulating the gas pressure at the wellhead at their nominal flow rates using angle fittings [1].

 The inefficiency of this method lies in the fact that when two or more wells operate simultaneously on one common loop, due to differences in their technical characteristics when the pressure fluctuates in the system, redistribution of well costs occurs with a decrease for low production wells, which accordingly leads to a reduction in the gas flow rate in the well’s lift to critical values, when the flow rate is not enough to carry the drip moisture, which begins to accumulate at the bottom.

 There is also known a method for intensifying the flow of gas to the bottom of the well using the effect of ejection of low-pressure high-pressure gas and a gas ejector containing an external finned displacement chamber and a fire heater [2].

 The disadvantages of this method and device is that the gas pressure ejector is based on the pressure ratio, which corresponds to a high gas flow rate through the ejector nozzle and, accordingly, a low efficiency. In addition, the drawback is a sharp decrease in the gas temperature behind the ejector, leading to hydrate formation, requiring additional costs to eliminate this drawback.

The purpose of the invention is the increase in the total flow rate of wells of various productivity with a minimum expenditure of reservoir energy
This goal is achieved by the fact that according to the proposed method of operating well gas wells, which includes connecting low-rate and high-rate wells using their plumes to a common loop through an ejector and operating wells with high-pressure gas ejection with regulation of the operation of the nozzles installed at the mouth of each of the wells or group gas collection points, low-flow and high-flow wells are additionally connected according to the bypass scheme, pressure stabilization by loops and fixation are carried out cosiness pressure at the wellheads to determine gas flow, then switch the wells from the bypass circuit to the ejector circuit and create additional depression to the bottom of the low-production well due to the excess pressure of the high-flow well from the condition that the pressure difference in the loops at the entrance to the ejector device is not more than 5% of nominal its meanings. When the pressure at the group gas collection point changes, the ratio of the pressure drops across the loops of each of the wells is carried out in self-regulation mode using an ejection device that includes a receiving chamber, a mixing chamber with a confuser and a diffuser. The receiving chamber is made with a tangential inlet and placed inside the nozzle and a narrowing conical element forming an intermediate chamber in the receiving chamber, connected to the confuser, configured to disperse the liquid accompanying the gas.

 Figure 1 presents the connection diagram of cluster wells through an ejection device; figure 2 is a longitudinal section of an ejection device for implementing a method of operating cluster gas wells with a common loop.

 The connection diagram (Fig. 1) of two wells includes a low-flow well 1, a discharge loop 2 connected by a chamber 12 of the ejecting device 3. A high-flow well 5 having overpressure, which is regulated by an angle fitting 6, is connected to it through a loop 4. The output of the ejection device 3 is connected with a common loop 7 going to a group gas collection point (not indicated). Between the loops 4 and 7, a bypass line 8 with an adjusting fitting 9 is located. Monitoring the adjustment of the operation of the ejecting device 3 is carried out by a manometer 10 and a thermometer 11.

 The ejection device (FIG. 2) includes a receiving chamber with a tangential inlet from the loop 2 and placed inside the nozzle 13 and a narrowing conical element 14, forming in the receiving chamber 12 an intermediate chamber 15 connected to the confuser 16, configured to disperse the liquid associated with the gas.

 The method of setting up the operation of cluster wells is as follows.

 According to the technological regime, wells 1 and 5 are adjusted according to the bypass circuit 8 with the regulating fitting 9 fully open and kept in operation until the pressure stabilizes along the loops. Fixing the pressure at the wellheads, their flow rate is determined by the device or by the indicator diagram. Then, the operation of the wells is switched to the ejector circuit, completely cutting off the bypass line, and monitoring the pressure at the wellhead 5, holding it at a constant value according to the technological mode using the nozzle 6, until the pressure is completely stabilized across all loops.

 Comparing the readings of the flow rate on the loop at the assembly point before and after turning on the ejecting device 3, the difference in the increase in costs from two simultaneously operating wells 1 and 5 is determined.

 If a low-production well 1 has a sharply falling characteristic of the flow rate from pressure (the effect of self-squeezing with moisture), then it is advisable to keep the gas flow rate of this well constant, the depression is increased. Thus, the total increase in gas production from the bush is carried out by increasing the flow rate from a high-rate well 5 without reducing the flow rate of a low-rate well 1.

 In both the first and second cases, the pressure drop across the input loops into the ejector device should not exceed 5% of the nominal pressure values in order to avoid lowering the temperature of the gas stream and hydrate formation behind the ejector. If there are significant pressure differences between wells 1, 5 along the bypass line 8 using the regulatory authority 9, it is necessary to transfer gas from well 5 to loop 7, while maintaining depression in low-rate well 1, which will increase gas production from the well.

 The device itself works as follows.

 Gas from the loop 4 enters the nozzle 3, which accelerates the flow, creating a vacuum in the receiving chamber 12. Gas is sucked into the receiving chamber 12 from the loop 2 at the tangential inlet and, twisting, enters the intermediate chamber 15 formed inside the receiving chamber 12 by the narrowing conical element 14 and a confuser 16, where the gas accompanying liquid is distributed by the layer on the surface and dispersed, and then moves by a common gas stream into the mixing chamber 17 and the diffuser 18.

 The inventive method and the ejection device allow you to adjust the operation of the wells both in design and non-design modes, caused, for example, by a decrease in flow rate at the output of the common loop 7. In this case, wells 1 and 5 reduce productivity, which negatively affects a low-production well: its bottom intense condensation of moisture occurs. When the design mode is restored due to excessive working pressure in a high-rate well, intensive liquid removal occurs from the bottom of a low-rate well, which is impossible with another production system without the use of a surfactant.

 Using this method and device allows to increase the volume of produced gas without increasing the number of wells, and also to reduce gas losses from blowing wells, which reduces the cost of produced gas, and also reduces the emission of well products into the atmosphere during operation.

Literature
Lavrushko P. N. et al. Oil and gas well operation. - M .: Nedra, 1971, p. 224-225.

 Korotaev Yu. P. et al. Gas production, transportation and underground storage. - M .: Nedra, 1984, p. 218.

Claims (3)

 1. A method of operating cluster gas wells, including connecting low-rate and high-rate wells using their plumes to a common loop through an ejector and working wells with high-pressure gas ejection with high-pressure control of the operation of the nozzles installed on the mouth of each of the wells or group gas collection points, characterized in that low-rate and high-rate wells are additionally connected by the bypass circuit, pressure stabilization is carried out along the loops and the pressure at the wellheads is fixed for I determine the gas flow rate, then switch the wells from the bypass circuit to the ejector circuit and create additional depression on the bottom of a low-flow well due to the overpressure of the high-flow well from the condition that the pressure difference in the loops at the inlet of the ejector device does not exceed 5% of its nominal values.  2. The method according to claim 1, characterized in that when changing the pressure at the group gas collection point, the ratio of the pressure drops across the loops of each of the wells is carried out in self-regulation mode using an ejection device.  3. Ejection device for operation of well gas wells, including a receiving chamber, a mixing chamber with a confuser, characterized in that the receiving chamber is made with a tangential inlet and placed inside the nozzle and a narrowing conical element forming an intermediate chamber in the receiving chamber connected to the confuser, made with the ability to disperse the fluid associated with the gas.

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