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Combined mining method for dry heat rock stratum and hydrate reservoir stratum

A combined mining and hydrate technology, which is applied in the combined mining of dry hot rock formations and hydrate reservoirs on the seabed, and in the field of thermodynamic exploitation of natural gas hydrates. Improve the utilization rate of single well, high economic benefit and strong application significance

Inactive Publication Date: 2020-02-18
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

However, none of these methods can realize the combined exploitation of hot dry rock formations and hydrate reservoirs.

Method used

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  • Combined mining method for dry heat rock stratum and hydrate reservoir stratum
  • Combined mining method for dry heat rock stratum and hydrate reservoir stratum

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing, the present invention will be further described: concrete well pattern structure such as figure 1 , 2 Shown:

[0021] The combined exploitation method of hot dry rock formation and hydrate reservoir comprises the following steps:

[0022] (1) This mining method is used in sea areas where there are large hydrate reserves and dry hot rock formations are developed under the hydrate reservoirs. The thickness of the hydrate reservoirs must be more than 15m, and the average temperature of the dry hot rock formations is higher than 120°C.

[0023] (2) According to the five-point well pattern deployment rules, deploy a comprehensive well in the center of the measure area, penetrate the overlying strata, hydrate reservoirs and horizontal interlayers, and extend to about one-third of the bottom of the hot dry rock strata.

[0024] (3) According to the deployment rules of the five-point well pattern, reservoir parameters such as th...

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Abstract

The invention discloses a combined mining method for a dry heat rock stratum and a hydrate reservoir stratum. The method comprises the following steps that (1), a comprehensive well is arranged in a regional center, and flowback wells are arranged around; (2), perforating is carried out on the portions, located at the hydrate reservoir stratum and the dry heat rock stratum, in the well; (3), seawater is injected into the dry heat rock stratum through an oil pipe in the comprehensive well; (4) the seawater heated by the dry heat rock stratum flows back to the hydrate reservoir stratum through the four flowback wells, so that the hydrate reservoir stratum is heated and hydrates are decomposed; (5) decomposed products of the hydrates flow into annuli of a casing pipe and the oil pipe of the comprehensive well, and downhole gas-liquid separation is carried out by a gas-liquid separator; and (6) gas separated by the gas-liquid separator is extracted through the casing pipe of the comprehensive well, and separated liquid enters the oil pipe of the comprehensive well and is injected into the dry heat rock stratum along with the seawater. According to the method, heat energy in the dry heat rock stratum is transferred to the hydrate reservoir stratum through the seawater medium, so that the comprehensive utilization of the energy of the dry heat rock stratum and the hydrate reservoir stratum is realized.

Description

technical field [0001] The invention relates to a thermodynamic exploitation method of natural gas hydrate, in particular to a combined exploitation method of seabed hot dry rock formation and hydrate reservoir based on the same well injection-production technique, and belongs to the technical field of natural gas hydrate exploitation. Background technique [0002] Natural gas hydrate has great development potential and application prospects. It is an efficient, clean and pollution-free natural gas, and is considered to be one of the future oil and gas substitutes. According to the physical and chemical properties of natural gas hydrate and the geological conditions, the mining methods currently proposed mainly include heat injection method, inhibitor injection method, solid fluidization method, depressurization method, CO 2 Replacement mining method, etc. However, none of these methods can realize the combined exploitation of hot dry rock formations and hydrate reservoirs....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/01E21B43/38F24T10/10
CPCE21B43/01E21B43/38F24T10/10Y02E10/10
Inventor 李占东刘建辉李中张海翔董钊刘淑芬郭永宾孟文波
Owner NORTHEAST GASOLINEEUM UNIV
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