Same well re-injection technology tubular column and method
A technology of process pipe string and pipe string, which is applied in the direction of earthwork drilling, wellbore/well parts, wellbore/well valve device, etc. It can solve the problems that affect the life and safety of the wellbore, serious problems, casing corrosion, etc., and achieve The effect of increasing output, increasing service life, and avoiding corrosion
Active Publication Date: 2018-09-28
PETROCHINA CO LTD
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[0056] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art. In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0057] In the first aspect, the embodiment of the present invention provides a same-well reinjection process string, as shown in the attached figure 1 And attached figure 2 As shown, it includes an inverted electric submersible pump 1, which is connected to oil pipe 2, screen pipe 3, and reinjection pipe section 4 in sequence from top to bottom.
[0058] The lower end of the screen tube 3 is connected to the upper end of the electric submersible pump 1;
[0059] The outer wall of the tubing 2 is provided with a traversable packer 201 through which the cable of the electric su...
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The invention discloses a same well re-injection technology tubular column and a method, and belongs to the field of natural gas exploitation. The tubular column comprises a reversed electric submersible pump, an oil pipe, a sieve pipe and a re-injection pipe section. The lower end of the sieve pipe is connected with the upper end of the electric submersible pump; and a traversable type packer isarranged on the outer wall of the oil pipe. The re-injection pipe section comprises an inner pipe and an outer pipe. The upper end of the inner pipe communicates with the electric submersible pump, and the lower end of the inner pipe is blocked. The outer pipe is arranged outside the inner pipe. An upper packer and a lower packer are arranged on the outer wall of the outer pipe. A re-injection channel is arranged in first annular space between the upper packer and the lower packer in the radial direction. Natural gas can be exploited by the oil pipe, gas field water is re-injected in a water injection layer through re-injection pipe section, and therefore corrosion to the pipes by the natural gas with sulfuretted hydrogen in the exploitation process is avoided; and the service life of a shaft is prolonged. In addition, the water injection layer is positioned on a production layer; influence on the natural gas exploitation caused by the gas field water injected under the production layer and turned into side water and low water is avoided, and production of the natural gas well is improved.
Description
technical field [0001] The invention relates to the field of natural gas exploitation, in particular to a same-well reinjection process string and method. Background technique [0002] In natural gas production, with the gradual reduction of gas reservoir pressure and natural gas flow velocity, the produced water or condensate in the gas reservoir cannot be carried out of the wellbore with the natural gas flow, and thus remain in the wellbore to form gas field water. Gas field water accumulates at the bottom of the well, forming a liquid column, causing additional hydrostatic back pressure on the gas reservoir, resulting in a continuous decline in the self-flowing energy of the gas well and affecting the production of the gas well. Therefore, it is necessary to treat gas field water. [0003] In the prior art, the gas field water is treated in the following way: after the gas-containing water (mixture of produced water or condensate and natural gas) is separated downhole by...
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IPC IPC(8): E21B43/40E21B34/08E21B43/20
CPCE21B34/08E21B43/20E21B43/40E21B2200/04
Inventor 陆林峰何明格陆小锋梁蕊朱达江唐思洪彭杨王晓娇张林
Owner PETROCHINA CO LTD