Geothermal storage layer transformation method

A reservoir and geothermal technology, applied in geothermal energy power generation, chemical instruments and methods, heat collectors using groundwater as a working fluid, etc., can solve the problems of not being able to effectively increase the water production of geothermal reservoirs, and achieve good application results. Improve profile and reduce waste of resources

Active Publication Date: 2019-10-11
SINOPEC SSC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for transforming geothermal reservoirs to solve the problem that existing methods cannot effectively increase the water production of geothermal reservoirs

Method used

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Embodiment 1

[0038] The transformation method embodiment 1 of the geothermal reservoir of the present invention adopts the following steps:

[0039] 1) According to the porosity and permeability data of each water layer in the geothermal well, the heterogeneity of the geothermal well is divided; in the geothermal well with weak heterogeneity, the porosity of each water layer is less than 15% , the permeability is less than 7mD.

[0040] The physical property data of each water layer in Well Xi-SSSS-3 are shown in Table 2.

[0041] Table 2 Physical property data of each water layer in Well Xi-SSSS-3

[0042]

[0043] According to the data in Table 2, Well Xi-SSSS-3 is a geothermal well with weak heterogeneity.

[0044] 2) Inject pretreatment fluid into the geothermal reservoir of Well Xi-SSSS-3, then repeatedly inject acid fracturing pre-fluid and acid fracturing working fluid, and then inject replacement fluid.

[0045] The composition of the pretreatment solution is: 20.0% hydrochlo...

Embodiment 2

[0058] Embodiment 2 of the transformation method of the geothermal reservoir of the present invention adopts the following steps:

[0059] 1) According to the porosity and permeability data of each water layer in the geothermal well, the heterogeneity of the geothermal well is divided; in the geothermal well with weak heterogeneity, the porosity of each water layer is less than 15% , the permeability is less than 7mD.

[0060] The physical property data of each water layer in Well HTJY-1 are shown in Table 5.

[0061] Table 5 Physical property data of each water layer in Well HTJY-1

[0062]

[0063] It can be seen from Table 5 that the physical properties of No. 1 layer, No. 7 layer and other layers show obvious differences, and Well HTJY-1 is a geothermal well with strong heterogeneity.

[0064] 2) Inject pretreatment fluid into the geothermal reservoir of Well HTJY-1, then repeatedly inject acid fracturing pre-fluid and acid fracturing working fluid, and then inject di...

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Abstract

The invention relates to a geothermal storage layer transformation method. The method comprises the following steps: 1) anisotropism strengths of geothermal wells are divided according to porosity andpermeability data of each water layer in the geothermal wells; and 2) for the geothermal wells with weak anisotropism, pretreatment liquid is injected in geothermal storage layers, then, acid fracturing prepad fluid and acid fracturing working fluid are repeatedly injected in sequence, and then, replacement liquid is injected; and for the geothermal wells with strong anisotropism, temporary blockage acid is firstly injected in the geothermal storage layers for temporary blockage, then, the pretreatment liquid is injected, then, the acid fracturing prepad fluid and the acid fracturing workingfluid are repeatedly injected in sequence, and then, the replacement liquid is injected. The geothermal storage layer transformation method performs the acid fracturing transformation according to properties of the geothermal storage layers, can form earthworm holes after transformation to communicate with natural cracks, improves the sections of heat storage layers, enlarges the seepage area, andachieves the purpose of increasing the water yield of mining wells and the water injecting quantity of reinjection wells.

Description

technical field [0001] The invention belongs to the field of acid fracturing transformation of reservoirs, and in particular relates to a transformation method of geothermal reservoirs. Background technique [0002] The geothermal energy utilization project is to arrange two wells on the same well site, one is a water production well and the other is a reinjection well. The hot water produced by the water production well is heated by the heat exchange system, and the heated water is used to provide heating for local residents through the heating pipeline. ; The hot water produced by the production well is cooled by the heat exchange system and then injected into the reservoir through the reinjection well to supplement the formation pressure. The above geothermal energy utilization process only obtains underground heat, does not discharge, and does not cause ground and underground pollution. [0003] Taiyuan formation reservoirs are carbonate reservoirs with strong heterogen...

Claims

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Application Information

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IPC IPC(8): E21B43/27E21B43/22C09K8/74C09K8/504F24T10/20
CPCC09K8/504C09K8/74C09K2208/32E21B43/16E21B43/261F24T10/20Y02E10/10
Inventor 黄朝阳邱杰朱默山潘朝军马军峰刘林学胡选平崔红丹杨文波孙香梅张兴权
Owner SINOPEC SSC
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