Reservoir transformation method and application of normal-pressure shale gas horizontal well

A shale gas well and reservoir reconstruction technology, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve problems such as low fracturing fluid flowback rate, low pressure coefficient, and reservoir damage, and achieve Solve the problem of incomplete gel breaking, improve fracturing effect, and strong operability

Active Publication Date: 2021-07-13
刘常青
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, some active explorations have been carried out on normal-pressure shale gas horizontal wells, mainly using techniques such as staged perforation, continuous sand addition, and normal-temperature fracturing fluid construction, which have achieved certain results in southeast Chongqing, but shale gas still exists. Gas wells are difficult to produce spontaneously, and the production is low
[0004] From a technical point of view, the main problems of normal pressure shale gas fracturing are: normal pressure shale gas reservoirs usually have the characteristics of low pressure coefficient, low formation temperature, etc., and insufficient formation energy, which is manifes

Method used

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  • Reservoir transformation method and application of normal-pressure shale gas horizontal well

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Effect test

Embodiment 1

[0046] Horizontal well A drilled high-quality shale sections from Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation. The lithology is black organic-rich siliceous shale. The measured depth is 4263-3041m. The horizontal section is 1222m long and divided into 17 sections. , segment length is 49-110m (average 78m), 2-4 cluster perforations, brittle mineral content is 66.63% (54.29-74.28), silicon content is 57.6% (40.23-69.95), clay content is 22.74% (18.09-33.76 ), bedding fractures are widely developed, and the overlying rock static pressure is 72.2MPa (71.79-72.5MPa).

[0047] Through the on-site micro-injection test, the measured vertical depth in the middle of the horizontal section is 3182.67m, the static pressure is 34.68MPa, the formation pressure coefficient is 1.08, and the temperature is 80°C. The test results show that the shale in this well area is a normal pressure reservoir.

[0048] In order to evaluate the production capacity of the target sh...

Embodiment 2

[0098] Theoretical model verification:

[0099] Based on the comsol multiphysics software platform, this study established a two-dimensional heat transfer-shale gas seepage numerical model in shale reservoirs, taking into account both free gas and adsorbed gas, and considering the dynamic adsorption capacity of shale for methane under different temperature conditions and The difference in methane viscosity was used to quantitatively evaluate the effect of hot slick water on improving shale gas production performance.

[0100] Simulation results show that:

[0101] (1) Assuming that the original reservoir temperature of A shale gas horizontal well is 80°C, if slick water at normal surface temperature of 20°C is used for fracturing, the numerical simulation results show that the minimum temperature near the wellbore will drop to 46°C after one day of operation, and the intersection of cold and heat Advance 125m from the wellbore to the far end along the artificial fracture.

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Abstract

The invention discloses a yield increasing method and application of a normal-pressure shale gas well. The yield increasing method comprises the steps that a shaft is subjected to acid treatment, and specifically, the shaft is pretreated through single-section acid liquor; prepad glue liquid joint making is conducted, glue liquid is injected to serve as fracturing fluid, the glue liquid displacement is increased in a stepped mode, and it is guaranteed that joints are effectively opened; pump injection of proppant-carrying hot slickwater is conducted for energy-enhancing joint expansion, the hot slickwater carrying a proppant is injected in a segmented mode, regular fluctuation of a construction pressure curve is controlled, and the purposes of improving reservoir energy, accelerating glue breaking and expanding the joints are achieved. According to the method, the shale energy value increased by fracturing can be quantified, so that the problems that the fracturing result cannot be quantified, the original reservoir temperature is reduced by the fracturing fluid, the reservoir energy of the normal-pressure shale gas reservoir is low, so that self-spraying production cannot be achieved, the natural gas in organic matter pores is slowly released, glue breaking is not thorough, the reservoir damage is easily caused and the like are solved. The method is high in operability, and the normal-temperature and normal-pressure shale gas fracturing effect is obviously improved and quantitatively evaluated.

Description

technical field [0001] The invention belongs to the technical field of production stimulation and transformation of shale gas reservoirs, and in particular relates to a production stimulation method and application of normal pressure shale gas wells. Background technique [0002] Atmospheric pressure shale gas refers to shale formations with a pressure coefficient of 0.8-1.2. Due to the tectonic uplift of formations during geological evolution, part of the originally generated hydrocarbons escapes, and the pressure and temperature of reservoirs are relatively low. Compared with the two, the difference is obvious, and the development of normal pressure shale gas is very difficult. How to produce atmospheric shale gas resources and realize its effective development has always been a major difficulty for researchers in shale gas exploration and development. [0003] At present, some active explorations have been carried out on normal-pressure shale gas horizontal wells, mainly...

Claims

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Application Information

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IPC IPC(8): E21B43/27E21B43/267E21B43/26
CPCE21B43/26E21B43/267
Inventor 刘常青
Owner 刘常青
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