Injection-production string in coal-bed gas well
A technology for coalbed methane wells and injection-production pipe strings, which is applied to valve devices, production fluids, and earth-moving drilling and production of wellbore/wells, can solve problems such as increasing the cost of coalbed methane production, reduce production costs, realize recycling, The effect of increasing productivity
Active Publication Date: 2018-05-25
PETROCHINA CO LTD
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Problems solved by technology
When injecting water into coalbed methane reservoirs through water injection wells, special water injection wells need to be drilled, which increases the cost of coalbed methane mining
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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0035] figure 1 It is a schematic diagram of an injection-production string in a coalbed methane well provided by an exemplary embodiment of the present invention, as shown in figure 1 As shown, the injection-production string in this coalbed methane well includes: casing 1, wellhead mechanism 2, oil well pump mechanism 3 and flow diversion mechanism 4;
[0036] The casing 1 is arranged in the coalbed methane well, and the end of the casing 1 close to the wellhead of the coalbed methane well is connected to the wellhead mechanism 2;
[0037] One end of the oil pump mechanism 3 is connected to the wellhead mechanism 2, and the other end of the oil pump mechanism 3 is located inside the casing 1 in the coalbed methane well. The wellhead...
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The invention discloses an injection-production string in a coal-bed gas well, and belongs to the technical field of coal-bed gas mining. The injection-production string comprises a casing pipe, an oil-well pump mechanism, a wellhead mechanism, and a diverging mechanism; the sleeve is arranged in the coal-bed gas well, and one end, close to the wellhead of the coal-bed gas well, of the sleeve is connected with the wellhead mechanism; one end of the oil-well pump mechanism is connected with the wellhead mechanism, and the other end of the oil-well pump mechanism is located inside the sleeve inthe coal-bed gas well; and the diverging mechanism is installed at a designated position of the oil-well pump mechanism, and the oil-well pump mechanism forms a radial channel and a axial channel at the designated position of oil-well pump mechanism. Underground water in the coal-bed gas well is pumped into the diverging mechanism through the oil-well pump mechanism, the diverging mechanism injects the underground water into a water injection layer of the coal-bed gas well through the radial channel, after local water is injected into the water injection layer, coal-bed gas enters the sleeve,the coal-bed gas entering the sleeve is transported to the ground through the axial channel and the wellhead mechanism, therefore, the integration of gas production and water injection is achieved, and the mining cost of the coal-bed gas is reduced.
Description
technical field [0001] The invention relates to the technical field of coal bed gas exploitation, in particular to an injection-production string in a coal bed gas well. Background technique [0002] Coalbed methane is an associated mineral resource of coal and a high-quality energy and chemical raw material. During the mining process of coalbed methane, the water injection method is usually used to transform the coalbed methane reservoir to increase the productivity of the coalbed methane production well. [0003] At present, the coalbed methane reservoir is injected with water through the water injection wells arranged near the coalbed methane production wells. When injecting water into the coalbed methane reservoir through the water injection well, it is necessary to drill a special water injection well, which increases the mining cost of the coalbed methane. Contents of the invention [0004] In order to solve the problems in the prior art, an embodiment of the presen...
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IPC IPC(8): E21B43/20E21B33/122E21B34/02
CPCE21B33/122E21B34/02E21B43/20
Inventor 李志广李风涛闫永维刘延平张子佳李川郭群甘宝安陈冬李海霞
Owner PETROCHINA CO LTD