A method for quickly constructing horizontal and super large salt cavern solution cavity storage

A super-large salt, flat-horizontal technology, applied in the direction of earth drilling, mining equipment, underground chambers, etc., can solve the problem of small cavity size, slow speed, well construction of inclined wells and the inability to fully utilize the cavity in the horizontal section, etc. problems, to achieve the effect of improving the recovery rate of rock salt and saving resources

Active Publication Date: 2022-02-08
江苏省制盐工业研究所有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention proposes a method for quickly constructing a horizontal super-large salt cavern solution cavity storage. The solution of the well group salt cavern solution cavity and the combination of multiple salt cavern cavities are used to build a super-large solution cavity storage. Difficulty in utilizing the cavities in inclined wells and horizontal sections during well production
The invention can make up for the problems of slow single-well cavity building speed and small cavity size, and at the same time solve the problem that the cavity in the opposite well can not be fully utilized in the inclined well and the horizontal section cavity

Method used

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  • A method for quickly constructing horizontal and super large salt cavern solution cavity storage
  • A method for quickly constructing horizontal and super large salt cavern solution cavity storage
  • A method for quickly constructing horizontal and super large salt cavern solution cavity storage

Examples

Experimental program
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Effect test

Embodiment 1

[0058] (1) 1# and 2# vertical wells are arranged in the rock salt mining area, which are (Z1, Z2) respectively, the completion depths are 1745m and 1780m, and the well spacing is 200m.

[0059] (2) Deploy 3# inclined well (Z3) between the two vertical wells and connect with Z1 and Z2 respectively through directional docking. The build-up point of Well Z3 is 1550m, and the build-up rate is 9.5° / 30m; the vertical depth of the docking point on the Z1 side is 1743m, and the well inclination is 61.11°; the vertical depth of the Z2 docking point is 1776m, the well deviation is 72.83°, and Z1 and Z2 ( image 3 ). The three wells are connected to alternate combined injection and row construction. The construction process adopts the method of "two injections and one row", and the construction period lasts for 3 months. In the first month, wells Z1 and Z2 were injected with water, and the water injection flow of both wells was 60m 3 / h, Z3 well drains brine; in the second month, Z1 an...

Embodiment 2

[0067] (1) Two vertical wells 1# and 2# were selected for 11 years of production in the rock salt mining area, which are X1 and X2 respectively. The completion depths of the two vertical wells are 1370m and 1285m respectively, and the well spacing is 160m. Wells X1 and X2 have been naturally dissolved.

[0068] (2) Since the cavities of wells X1 and X2 have been dissolved, the 3# vertical well (X3) will be constructed between the two vertical wells in the later stage. Well X3 will be directly drilled into the dissolved cavities of X1 and X2, and the three wells will be connected with X1 and X2 ( Figure 4 ).

[0069] (3) According to the cavity measurement results, the X1 and X2 cavities are dissolved up to 1220m and 1215m, and the effective cavity volumes are about 26×10 4 m 3 , 19×10 4 m 3 . The top of the corresponding cavity in Well X3 dissolves to 1263m. Compared with the dissolution of X1 and X2, well X3 lags behind. Take X3 water injection (water injection speed i...

Embodiment 3

[0074] (1) Select a group of paired wells in the rock salt mining area. Well 1# is a directional well and Well 2# is a vertical well, respectively J1 and J2. The completion depths are 1450m and 1385m respectively, the well spacing is 180m, and the cumulative thickness of the rock salt layer is up to 600m. Among them, J1 and J2 are a pair of wells that have been produced for 4 years.

[0075] (2) Since there is already a horizontal section cavity (or channel) between wells J1 and J2, a 3# vertical well (J3) will be constructed between the two wells in the later stage, and Well J3 will be drilled directly into the horizontal section cavity (or channel), Three wells connected with J1 and J2 ( Figure 5 ).

[0076] (3) According to the cavity measurement results, the tops of the J1 and J2 cavities were dissolved to 1350m and 1335m, and the measured cavity volumes were 18×10 4 m 3 , 5×10 4 m 3 . The upper dissolution of the corresponding cavity of Well J3 is 1410m, which lag...

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Abstract

The invention relates to a method for quickly building a horizontal and super large salt cavern dissolution cavity storage, specifically through multi-well connection, utilization of multi-salt cavern dissolution cavity combination in series, multi-well combination large-flow water injection, multi-well group The combination of injection and drainage controls the shape of the cavity to realize the rapid construction of super large salt cavern solution cavity storage. The invention can realize large-flow injection and drainage, rapid cavity expansion, and achieve the purpose of artificially controlling the cavity upthrust and cavity development shape by adjusting different injection and drainage combinations of the well group, and realizing the rapid construction of super large salt cavern solution in layered rock salt. Cavity storage has the characteristics of short cavity construction period, large dissolved cavity volume, human intervention in the cavity development process, and high rock salt recovery rate.

Description

technical field [0001] The invention is a method for rapidly constructing a horizontal and super large salt cavern dissolution cavity storage, which belongs to the technical category of water-soluble mining of salt deposits, is suitable for underground salt deposit mining and salt cavern dissolution cavity construction, and is a kind of salt cavern dissolution cavity High-efficiency, large-volume, low-cost technical method for cavity construction. Background technique [0002] In recent years, in order to solve the problem of oil and gas transportation in my country, many long-distance oil and gas pipelines have been built in China, but the supporting storage and adjustment of energy storage is relatively lagging behind. my country's energy reserves are far lower than those of developed countries, which seriously threatens the national energy strategic security. Some developed countries (the United States, Germany, Canada, France, etc.) use salt caverns to store oil and gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D13/02
CPCE21D13/00
Inventor 付星辉刘凯李行卢青峰刘正友许鹏张文广
Owner 江苏省制盐工业研究所有限公司
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