A method for water control and production enhancement of high water cut oil wells in low permeability bottom water reservoirs

A bottom-water reservoir, low-permeability technology, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc. Layer damage and other problems, to achieve the effect of improving the bonding strength and compressive strength, good application prospects, and controllable thickening time

Active Publication Date: 2021-01-29
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to overcome the problem that the chemical water plugging of conventional oil wells in low-permeability bottom water reservoirs is mainly polymer plugging agents, while high-water-cut wells in low-permeability bottom water reservoirs often have high water output strength and high wellhead pressure, resulting in polymer plugging. The strength of the plugging agent is difficult to meet the plugging requirements; the second purpose is to overcome low-permeability bottom water reservoirs. Under the existing technology, the poor injectivity of high-strength plugging agents such as cement is likely to cause damage to the reservoir near the wellbore and after solidification Easy to shrink, low bonding strength with the formation, can not be plugged for high water-cut wells or difficult to increase production after plugging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for water control and production enhancement of high water cut oil wells in low permeability bottom water reservoirs, comprising the following steps:

[0028] 1) Mix 40-70 parts by mass of nano-composite high-strength plugging agent and 50 parts by mass of clear water to form a suspension; the nano-composite high-strength plugging agent is composed of 70%-90% by mass of ultra-fine cement, It is mixed with a nano-enhancer with a mass ratio of 1%-30% and a retarder with a mass ratio of 1%-20%; the particle size of the ultra-fine cement is 0.2µm-20µm; the nano-enhancer is made of hydrophilic Type nano-silica and lipophilic nano-silica mixed, the mass ratio of hydrophilic nano-silica and lipophilic nano-silica is 3:1~1:3; the retarder is larch Sulfonated tannins, larch sulfonated tannins are sulfonated products of tannins and non-tannins;

[0029] 2) Inject the suspension in step 1) into the formation under the condition of 0-90°C to seal the water outlet and crac...

Embodiment 2

[0043] A method for water control and production enhancement of high water cut oil wells in low permeability bottom water reservoirs, comprising the following steps:

[0044] 1) Mix 50 parts of nano-composite high-strength plugging agent and 50 parts of clean water to form a stable suspension; the nano-composite high-strength plugging agent consists of ultra-fine cement with a mass ratio of 70%, nano-reinforcing agent with a mass ratio of 20% and mass Said ultra-fine cement is an existing product mixed with 10% retarder, and the particle size is 10 μm; : a mixture composed of 1; the retarder refers to larch sulfonated tannin extract, the main component of which is tannin and non-tannin sulfonated products.

[0045] 2) Inject the suspension of nanocomposite high-strength plugging agent in step 1) into the formation at 80°C to form plugging of water outlet parts and cracks;

[0046] 3) Use clean water to balance and replace all the nano-composite high-strength plugging agent su...

Embodiment 3

[0055] A method for water control and production enhancement of high water cut oil wells in low permeability bottom water reservoirs, comprising the following steps:

[0056] 1) Mix 70 parts of nano-composite high-strength plugging agent with 50 parts of clean water to form a stable suspension; the nano-composite high-strength plugging agent is composed of ultra-fine cement with a mass ratio of 80%, nano-reinforcing agent with a mass ratio of 15% and a mass ratio of 5 % retarder; the ultra-fine cement is an existing product with a particle size range of 20 µm; : a mixture composed of 1; the retarder refers to larch sulfonated tannin extract, the main component of which is tannin and non-tannin sulfonated products;

[0057] 2) Inject the suspension of nanocomposite high-strength plugging agent in step 1) into the formation at 50°C to form plugging of water outlet parts and cracks;

[0058] 3) Use clean water to balance and replace all the nano-composite high-strength plugging ...

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Abstract

The invention belongs to the technical field of oil well water plugging and fracturing stimulation used in oil production, and particularly relates to a water control and stimulation method for a high-water-cut oil-producing well in low permeability bottom water reservoir. The method comprises the steps that a nanometer composite high-strength plugging agent and water are mixed according to the mass ratio of (4-7):5; under the condition of 0-90 DEG C, a mixture is injected into the stratum to plug water outlet positions and cracks; the nanometer composite high-strength plugging agent enters anoil well reservoir through balanced displacement by using clear water; well shutdown and waiting on cement setting are carried out; drafting process is carried out to the shaft bottom; pressure-testing is carried out by a cementing truck; radial hydraulic jet fracturing is carried out at the top of a reservoir sand body; and well opening is carried out for pumping and putting into production. Thewater control and stimulation method solves the problem that a high water-cut well cannot be blocked or the difficulty of stimulation is high after being blocked due to the fact that a plugging agentis low in strength or prone to being shrunk after curing, and has low cementing strength with the stratum in a conventional water plugging technology, and a new way for the water control and stimulation technology of the high-water-cut oil-producing well in the low permeability bottom water reservoir is opened up.

Description

technical field [0001] The invention belongs to the technical field of oil well water plugging and fracturing production increase used in petroleum exploitation, and in particular relates to a method for controlling water and increasing production of an oil well with high water content in a low-permeability bottom water reservoir. Background technique [0002] In the development process of low-permeability bottom water reservoirs, due to the influence of formation fractures and heterogeneity, coupled with fracturing and putting into production, it is very easy to cause the bottom water to be communicated after the oil well measures, the water cut rises greatly, and the water cut is high. It seriously affects the production capacity of the oil well and the long-term stable production of the oil field. The current conventional water control and plugging technology can no longer meet the needs of this type of reservoir for water control and production increase. Bottom water re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B33/13E21B43/26C09K8/467
CPCC09K8/467E21B33/13E21B43/16E21B43/26
Inventor 王玉功武龙李志航李勇吴增智宋振云邹鸿江唐冬珠赵晨君徐洋汪小宇王所良蒋文学万向辉金娜王玲陈建刚王小文张林
Owner BC P INC CHINA NAT PETROLEUM CORP
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