Oil well filling packer particle precipitation and oil increasing method for crack-type oil and gas reservoirs

A technology for oil and gas wells and oil and gas reservoirs, which is applied in the field of oil and gas well exploitation, and can solve problems such as the failure to effectively solve the problem of water discharge, the failure of plugging medium degradation, and the life span of more than 3 months, so as to improve the plugging effect and reduce the diversion Ability, the effect of increasing the degree of use

Pending Publication Date: 2019-04-19
ANTON BAILIN OILFIELD TECH (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the gel plugging method is the most widely used, but it is difficult to determine the appropriate gel strength in practical applications. If the gel strength is too high, it will be difficult to inject into cracks; The gel and chemical reagent plugging method can use thickeners as the plugging medium, but the gel and chemical reagent plugging method is affected by the harsh environment such as underground high temperature and high salt. The medium is prone to degradation and failure, and its life is difficult to exceed 3 months
WO2011 / 069339 discloses a technical solution for using packer particles to prevent channeling in the production section of oil and gas wells, but this patent does not directly provide that the packer particles are applied to oil and gas wells in fractured oil and gas reservoirs. Technical Enlightenment of Fracture Sealing
Based on the above reasons, the water production problem of oil and gas wells in fractured oil and gas reservoirs has not been effectively solved so far.

Method used

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  • Oil well filling packer particle precipitation and oil increasing method for crack-type oil and gas reservoirs

Examples

Experimental program
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Effect test

Embodiment 1

[0062] This example provides a method for filling the oil and gas wells of fractured oil and gas reservoirs with packing particles to reduce water and increase oil production. The method directly fills the wellbore and fractures with packing particles to realize the plugging of the fractures, specifically including the following steps: ( a1) Filling fluid carrying packer particles is injected into the wellbore and fractures through the wellhead; until the formation fracture / fracture extension pressure is reached or exceeded, or until the injection volume under the unit injection pressure is close to zero, or until the preset isolation is reached (a2.1) Run the flushing pipe to clean up the packer particles in the wellbore; (a2.2) Put into production.

[0063] In the above step (a1), there are three criteria for the filling termination of the injected filling fluid, corresponding to the wellbore of the production section with different structures and different fractures. In prac...

Embodiment 2

[0070] Embodiment 2 is a further optimization of Embodiment 1. According to the technical solution described in Example 1, when the oil and gas well is put into production, since the fluid in the fracture flows from the fracture to the wellbore, the fluid will drive some particles to be recovered to the wellbore and produced, which brings the following problems: First, some fractures After the packer particles in the fracture are recovered, the filling degree of the fracture packer decreases, and the ability to control water and hinder water flow decreases; especially for some wide erosive fractures, a large number of packer particles entering the fracture will be recovered after being put into production. to the wellbore, so that the plugging and water control effects of fractures cannot be maintained; the second is that the output of the packer particles will have a certain impact on the operation of the downhole electric pump, such as the risk of pump stuck; the third is tha...

Embodiment 3

[0079] Embodiment 3 is a further optimization of Embodiment 2. The technical solution described in Example 2 has the following problems: First, after the fracture is filled with packer particles, although the conductivity is greatly reduced compared with that before filling, its permeability is still higher than that of the matrix relative to the matrix (several times to hundreds of times), there is still a certain amount of water produced, and it is necessary to further reduce the water production of fractures; second, there are many reasons for water production along the production section of the wellbore, some of which are caused by local high-permeability matrix water production, and water is only controlled in fractures The effect is not necessarily ideal.

[0080] In this regard, Example 3 uses a water control screen to further improve the water control capability. Such as Figure 4 As shown, the difference between this embodiment and embodiment 2 is that the screen us...

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Abstract

The invention relates to an oil well filling packer particle precipitation and oil increasing method for crack-type oil and gas reservoirs. The method comprises the following steps: (1) injecting filling liquid carrying packer particles into a wellbore and cracks by virtue of a wellhead until reaching or exceeding the formation fracture/fracture extension pressure, or until reaching zero injectionvolume per unit injection pressure, or until reaching a preset packer particle filling volume; (2) putting into production. According to the oil well filling packer particle precipitation and oil increasing method for the crack-type oil and gas reservoirs, the problem of channeling water in various types of cracks can be effectively solved by directly filling and stoping filling the cracks, filling an annular space and filling from a water injection well to a production well, and in particular, the two-pressure-stage pressurized filling way and stoping filling way are adopted, so that the packer particles smoothly enter the gapless cracks, the sealing effect of the cracks is effectively improved, the guiding capability of various cracks can be reduced, and the water output of the wells isreduced; meanwhile, the pressure gradient during the matrix production is further improved, the utilization degree of matrix oil and gas is improved, and the recovery ratio is improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well exploitation, and relates to a method for exploiting an oil and gas well in a fractured oil and gas reservoir, in particular to a method for filling an oil and gas well in a fractured oil and gas reservoir to reduce water and increase oil by packing particles Background technique [0002] Fractured oil and gas reservoirs are ubiquitous, accounting for about half of the existing producing oil and gas reservoirs. Most fractured oil and gas reservoirs are developed by water flooding, including bottom water flooding, edge water flooding, and injection water flooding of injection wells. Due to the existence of fractures, the channeling flow rate of water is large during the water flooding development process, which makes the oil and gas wells break through water in advance, resulting in a very high water content of the oil well and a significant reduction in oil production. The actual product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13C09K8/64
CPCE21B33/13C09K8/64C09K8/512C09K8/508E21B47/06E21B43/04E21B43/26C09K8/50E21B43/16
Inventor 裴柏林章诵梅冯国江王海龙
Owner ANTON BAILIN OILFIELD TECH (BEIJING) CO LTD
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