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Method for rapidly constructing horizontal ultra-large salt cavern cavity storage

A super-large salt, horizontal technology, applied in the field of high-efficiency, large-volume, underground salt deposit mining and salt-cavern construction, low-cost cavity construction, which can solve the difficulty of inclined shaft and horizontal section cavity. Problems such as slow utilization, slow cavity construction, and inability to make full use of the inclined well and horizontal section cavity, so as to make up for the slow cavity construction speed of a single well and improve the cavity construction efficiency.

Active Publication Date: 2019-12-20
江苏省制盐工业研究所有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for rapidly constructing horizontal ultra-large salt cavern cavity storage
  • Method for rapidly constructing horizontal ultra-large salt cavern cavity storage
  • Method for rapidly constructing horizontal ultra-large salt cavern cavity storage

Examples

Experimental program
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Effect test

Embodiment 1

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

[0059] (2) Deploy 3# inclined well (Z3) between the two vertical wells, and communicate 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 Z1 side docking point is 1743m, and the well deviation is 61.11°; the Z2 docking point is 1776m vertical depth, the well deviation is 72.83°, and the two sides are directional connected to Z1 and Z2 ( image 3 ). Three wells are connected and rotated to combine injection and drainage to build tanks. The tank construction process adopts the method of "two injections and one row", and the tank construction period lasts for 3 months. In the first month, wells Z1 and Z2 were injected with water, and the water injection flow rate of both wells was 60m 3 / h, Z3 well ...

Embodiment 2

[0067] (1) Select 1# and 2# two 11-year-old vertical wells in the rock salt mining area, namely X1 and X2. 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, 3# vertical well (X3) will be constructed between the two vertical wells in the later stage, and well X3 will be drilled directly into the dissolved cavity 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 melt to 1220m and 1215m, and the effective cavity volumes are about 26×10 4 m 3 , 19×10 4 m 3 . Well X3 corresponds to the top of the cavity and dissolves to 1263m. Compared with X1 and X2, the upper solution is lagging behind in the X3 well. Take X3 water injection (water injection speed is controlled at 120-180m 3 / h), X1 a...

Embodiment 3

[0074] (1) Select a pair of 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, and the well spacing is 180m. Up to 600m. Among them, J1 and J2 are a pair of wells that have been producing for 4 years.

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

[0076] (3) According to the cavity measurement results, the top of J1 and J2 cavities dissolve to 1350m and 1335m, and the measured cavity volumes are 18×10 4 m 3 , 5×10 4 m 3 . Well J3 corresponds to the cavity uphole melting to 1410m, which lags behind that of J1 and J2, so J3 water injection is adopted (the water inject...

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Abstract

The invention relates to a method for rapidly constructing a horizontal ultra-large salt cavern cavity storage. Specifically, the ultra-large salt cavern cavity storage is constructed through communication of multiple wells by means of series combination of multiple salt cavern cavities, combined high-flow water injection of the multiple wells, and combined injection and drainage of multiple wellsets for cavern cavity form control. By the adoption of the method, high-flow injection and drainage can be achieved to rapidly construct cavern cavities and to improve the capacity, the purpose of manual control over upward dissolution and development forms of the cavern cavities is achieved through adjustment of different injection and drainage combination modes of the well sets, and rapid construction of the ultra-large salt cavern cavity storage in laminar rock salt is realized; and the method has the advantages that the cavern cavity construction period is short, the size of the cavern cavities is large, the development process of the cavern cavities can be manually intervened, and the recovery rate of the rock salt is high.

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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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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