Method for improving water drive recovery factor of thick positive rhythm reservoir

A technology of thick oil layer and recovery factor, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of unsatisfactory production effect and bottom water ridge entry, etc. The effect of increased resistance and increased displacement

Active Publication Date: 2010-11-03
PETROCHINA CO LTD
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Problems solved by technology

However, after long-term water injection development, the bottom of the oil layer will be severely flooded, which will cause serious bottom water ridges during horizontal well production, and the production effect is not ideal

Method used

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  • Method for improving water drive recovery factor of thick positive rhythm reservoir
  • Method for improving water drive recovery factor of thick positive rhythm reservoir
  • Method for improving water drive recovery factor of thick positive rhythm reservoir

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 Indoor physical simulation and numerical simulation experiment

[0023] Fluid physical properties: using the Putaohua oil layer in Daqing Oilfield, the viscosity of underground crude oil is 8.68mPa.s, and the density of crude oil is 0.8521mg / cm 3 . The low-permeability layer of positive rhythm thick oil layer is 200mD, the permeability of high-permeability layer is 2000mD, and the permeability difference is 10. General water injection, the injection rate is 0.1PV / a, the injection-production balance is maintained during the development process, and the horizontal well retaining dam measures are carried out after the predicted water flooding reaches 90% water cut, and the water cut is predicted to be 95%, and the oil increase effect is compared.

[0024] (1) Indoor physical simulation experiment

[0025] Model parameters: length 40cm, width 1.3cm, thickness 20cm, porosity: 44%, bound water saturation 20%. The dark liquid is water, the light liquid is oil, ...

Embodiment 2

[0042] The technique of placing gel in the deep part of the horizontal well of the present invention is applied to the oil reservoir in the northern area of ​​Daqing Changyuan for simulation. The main types of sand bodies in this reservoir are meandering river sand bodies and distributary channel sand bodies, which are the main oil layers in the oilfield, and the deposits in the layers are dominated by positive rhythm deposits; the oil layers are widely distributed, well connected, thick, and high in permeability; Layer average permeability is 1637×10 3 μm 2 , the effective thickness reaches 12.61m, the average porosity is 27.6%, and the viscosity of formation crude oil is 8.3mPa·s.

[0043] A five-point area well pattern with an injection-production well spacing of 182m was selected and formed, with a total of 25 injection wells and 36 production wells. The area of ​​the test area is 1.65km 2 , the average effective thickness of the target layer Pu I1-4 is 12.6m, and the g...

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Abstract

The invention relates to a method for improving a water drive recovery factor of a thick positive rhythm thick reservoir, in particular to a method for improving the oil reservoir water drive of the thick positive rhythm reservoir by horizontal well gel deep fluid diversion. A horizontal well is drilled in a high permeability formation of the thick positive rhythm reservoir, gel is injected into the high permeability formation through the horizontal well, a dam with the height consistent with that of the high permeability formation is built in the high permeability formation, and the horizontal well is positioned in the middle part between a water injection well and an oil producing well or near the oil producing well; the kv / Kh of the high permeability formation is between 0.01 and 0.2; the horizontal well is completed in a perforation mode, and the diameter of the horizontal well is 5 to 10 inches; and the gel is acrylamide, active starch, phenolic resin, organic chromium jelly, silicate with calcium chloride or silicate with diluted hydrochloric acid. The method can increase water-driven oil filtration resistance of the thick positive rhythm reservoir, change the flow direction of injected water, force the injected water to flow to a relatively enriched zone of low permeability crude oil, expand swept volume, and improve oil driving effect.

Description

technical field [0001] The invention relates to a method for improving oilfield water flooding recovery, in particular to a water flooding method for improving positive rhythm thick oil reservoirs by diverting fluid flow in the deep part of the gel in a horizontal well. Background technique [0002] my country's oilfield reservoirs are mostly multi-layer oilfields with continental clastic rock deposits, the effective thickness of a single layer is greater than 4 meters, the heterogeneity is serious vertically and horizontally, the internal permeability of the reservoir is large, and the permeability of channel sand bodies It is characterized by a positive rhythmic distribution with low upper part and higher lower part. Most of the crude oil is medium-quality oil, and the underground viscosity is generally 10-50 mPa·s. During the injection and development of such reservoirs, the injected water tends to channel from the lower high-permeability layers with relatively high permea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B43/22
Inventor 刘玉章刘合王家禄王强高建
Owner PETROCHINA CO LTD
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