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Method for prolonging fracturing validity period of intersalt argillaceous dolomite reservoir and application thereof

A long-term, fracturing technology, applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as large gaps and small contact areas, and achieve increased stimulation volume, improved conductivity, and reduced salt rock. Effects of dissolution or creep

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method provided by this patent is not a fracturing method, but a method of increasing the contact area of ​​the reservoir. It can only lay proppant in the formed radial channel, and the contact area with the reservoir is small, which is different from the formation of fracturing. Compared with the fracture area, there is a large gap, and the proppant added is less

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  • Method for prolonging fracturing validity period of intersalt argillaceous dolomite reservoir and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0082] Well X is an evaluation horizontal well in Jianghan Oilfield. The completion method is casing completion. The structural location is the south slope of the Benghu syncline in the Qianjiang Sag. The drilling completion layer is the potential 3 4 -10 rhythm, the vertical depth of target point A of the horizontal well is 3153m, the vertical depth of target point B is 3333m, and the horizontal section is 500m long. 4 -10 rhyme capacity. The reservoir lithology of this well is mainly carbon-rich laminated argillaceous dolomite, with 25.97% calcite, 24.46% dolomite, 13.41% quartz + feldspar, 25.14% clay, and 4.03% salt. The upper and lower barriers are salt rock layers, the thickness of the reservoir is 10m, the thickness of the upper barrier is 20m, and the thickness of the lower barrier is 10m. The stress difference between the reservoir and the barrier is relatively large, which can play a good barrier effect. The reservoir pressure coefficient is 1.06-1.16, and the reser...

Embodiment 2

[0108] Well Y is a development horizontal well in Jianghan Oilfield, the completion method is casing completion, the structural location is the south slope of the Benghu syncline in the Qianjiang Sag, and the drilling completion layer is the potential 3 4 -10 rhythm, horizontal well A target point vertical depth is 3019.6m, B target point vertical depth is 3176.3m, and the horizontal section is 800m long. 4 -10 Experimental application of rhythmic new technology and new technology. The reservoir lithology of this well is mainly carbon-rich laminated argillaceous dolomite, with 23.44% calcite, 29.52% dolomite, 19.78% quartz + feldspar, 21.3% clay, and 6.03% salt. The upper and lower barriers are salt rock layers, the thickness of the reservoir is 7.6m, the thickness of the upper barrier is 17m, and the thickness of the lower barrier is 12m. The stress difference between the reservoir and the barrier is relatively large, which can play a good barrier role. The reservoir pressur...

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Abstract

The invention discloses a method for prolonging the fracturing validity period of an intersalt argillaceous dolomite reservoir and application of the method. The method comprises the steps that acid is injected in the fracture forming stage, and the top end and the bottom end of a fracture are plugged; variable-viscosity variable-displacement alternate injection acid fracturing construction is carried out; and carrying out sand adding construction on the salt-resistant clean polymer fracturing fluid. According to the method, the top and the bottom of the fracture are blocked through the whole-course acid liquid alternate injection in the fracture forming stage and mixed application of the ultra-low-density proppant and the high-density proppant, the fracture height is finely controlled, the fracture only extends in the reservoir range, dissolution and wriggling of a salt rock layer are avoided, scaling and blocking of wellbore liquid after fracturing are reduced, meanwhile, branch fractures can be formed, and the fracturing efficiency is improved. The transformation volume is enlarged; salt-resistant fracturing fluid or acid fluid is adopted for carrying sand, effective laying of a proppant is improved, the flow conductivity of fractures is improved, effective transformation of the argillaceous dolomite in a reservoir is achieved, dissolution and creep of interlayer salt rock are avoided, the yield of the intersalt argillaceous dolomite is increased, and the validity period of the intersalt argillaceous dolomite is prolonged.

Description

technical field [0001] The invention belongs to the field of fracturing, in particular to the technical field of fracturing reconstruction of argillaceous dolomite reservoirs, and more specifically relates to a new method suitable for fracturing of inter-salt argillaceous dolomite reservoirs. Background technique [0002] At present, inter-salt argillaceous dolomite oil reservoirs are rare in the world at home and abroad, but in the Qianjiang structure of Sinopec Jianghan Oilfield, a large number of inter-salt argillaceous dolomite oil reservoirs are distributed, and the reserves are abundant, with the highest dolomite content reaching 42.23%-67.64%, quartz content 7.71%-10.14%, the reservoir generally presents the characteristics of "high carbonate, low quartz, low clay minerals". The thickness of the reservoir is generally about 10m, and it is multi-layered in sheet form vertically, and the lateral distribution is stable. The upper and lower barriers are all sodium chlori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/27
CPCE21B43/26E21B43/267
Inventor 蒋廷学吴春方陈作李奎为刘建坤刘世华吴峙颖
Owner CHINA PETROLEUM & CHEM CORP
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