CN1594827A

CN1594827A - Water shut off technological process for viscous crude well

Info

Publication number: CN1594827A
Application number: CN 200410020825
Authority: CN
Inventors: 杨双虎; 徐凤廷; 白云渡
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-06-23
Filing date: 2004-06-23
Publication date: 2005-03-16

Abstract

The present invention relates to a thick oil well water shut off technological process for thick oil well water shut off layer and improving exploitation effect. The process bases on 'deep move shallow shut off' principal, first selectively shutting off the big diameter for the oil layer by degradable organic shut off additives, then sealing the opening by high temperature resistant inorganic shut off additives, and realizing selective water shut off by pressure control and degradation of organic matter. The water shut off process is reasonable in design, reliable in criterion, and has the characteristic of small construction risk, high success rate and long validity period compared with other thick oil well water shut off processes, and provides a new effective process for solving the water shut off problem for thick oil especially middle thick oil well.

Description

A kind of heavy oil wells water-plugging technology method

Technical field:

The present invention relates to a kind of be used for oil well particularly heavy oil wells shutoff water layer improve the process of exploitation effect.

Background technology:

Along with the continuity of oil field development process, crude oil water containing, oil well aquifer yield improve constantly, and crude output and exploitation effect are constituted adverse effect.The shutoff water layer, improve the important topic that exploitation effect just becomes heavy oil wells exploitation.Because common chemical water shutoff can not be high temperature resistant, therefore conventional at present viscous crude water blockoff is mainly taked water pack off and cement baffle water blockoff dual mode.Yet, the heat extraction by steam injection heavy oil wells is handled up owing to many rounds, usually there is the outer groove of scurrying of pipe, make water pack off to implement, the then influence of factor such as mobile variation after the dehydration in the stratum of cement baffle water blockoff because of time of theing cement solidifies and cement paste, blocking radius is little, and construction risk is big, and effective time is short.In order to strengthen blocking radius, multiple high temperature resistant inorganic blocking agent was once tested at the scene, but this type of blocking agent is to the stratum heavy contamination, caused the oil well output of handling up to descend significantly, can not satisfy fully and produce needs.

Summary of the invention:

The object of the present invention is to provide the heavy oil wells water-plugging technology method that a kind of water plugging effect is good, construction risk is little and period of validity is long.

Process technical scheme provided by the invention is as follows: this kind heavy oil wells water-plugging technology method was utilized degradable organic blocking agent that oil reservoir is carried out the selective shut-off of long radius before this according to the principle of " transfer deeply shallow stifled " and was placed a heat insulating belt thereafter, utilize resistant to elevated temperatures inorganic blocking agent to seal then, realize selective water plugging by pressure control and organic degraded simultaneously.Dark timing determines that according to oilwell water shutoff construction pump-in pressure needs clamp-on the concrete consumption of blocking agent, reaches the purpose of thoroughly carrying out the deep shutoff; Dark to transfer the back that the inorganic blocking agent of water-yielding stratum squeeze note is carried out shallow stifled, shallowly determines plug agent amount according to core intersection and blocking radius when stifled.

The implementation step of this water shutoff technology is as follows:

1, adopt the gel-like blocking agent to carry solid phase particles, squeeze note first slug carries out the shutoff of selectivity deep.This blocking agent by 0.3～0.5% polyacrylamide, 1.5～2.5% rubber grain, 1.0～3.0% resin fibre is plain or other labile organic compound particle adds water and is mixed and forms, consumption is 300～400m ³, squeeze pressure is controlled at 16～17MPa;

2, adopt native powder class blocking agent squeeze note second slug, form heat insulating belt.This blocking agent is the aqueous solution of 30% native powder+20% cement (all the other are water) preparation, calculates consumption 40～50m by blocking radius 1.5m ³, pump-in pressure is controlled at below the 14MPa;

3, adopt cement class or resin and shallow blocking agent squeeze note the 3rd slug of water glass class to seal, finish shallow stifled.This plug agent amount determines that according to core intersection blocking radius should reach more than the 1m, and design formulas is Q=π r ². Φ h (in the formula, Q-plug agent amount, m ³The h-core intersection, m; The r-blocking radius, m; Φ-oil reservoir degree of porosity) pump-in pressure is controlled at below the 10MPa.

The present invention is reasonable in design, according to reliable, compare with other viscous crude shutoff method and to have characteristics such as construction risk is little, success rate is high, period of validity is long, for solve heavy oil wells particularly in deeply heavy oil wells water blockoff problem new effective ways are provided.

The specific embodiment: enforcement of the present invention provides with the following example.

Embodiment 1: certain oil field 81-598 heavy oil wells water blockoff.According to above-mentioned implementation step construction, wherein, first slug adopts 1.2 tons of polyacrylamides, and 5 tons of rubber grains, elm bark powder add water for 4 tons and be mixed consumption 360m ³, pump-in pressure is raised to 16.5Mpa and stops annotating, and stablizes half an hour; Calculate by blocking radius 1.5m, second slug adopts 30 tons of swell soils, cement to be made into 50m for 20 tons ³The aqueous solution, it is heat insulation to clamp-on the stratum, and pump-in pressure is 13Mpa; Calculate by blocking radius 1m, the 3rd slug is made into aqueous solution 12m for 15 tons with cement ³Seal, pump-in pressure is 10Mpa.

Embodiment 2: certain oil-field thick-oil well 77-5100 well water blockoff, construction sequence is the same.Wherein, first slug: adopt 1.5 tons of polyacrylamides, rubber grain to add water for 5 tons and be made into consumption 400m ³, pump-in pressure is 16Mpa; Second slug: adopt 30 tons of swell soils, 20 tons of cement are made into 50m ³The aqueous solution, it is heat insulation to clamp-on the stratum, and pump-in pressure is 11Mpa; The 3rd slug: be made into 50m for 30 tons with water glass ³The aqueous solution seals, and pump-in pressure is 11Mpa.

Claims

1, a kind of heavy oil wells water-plugging technology method, it is characterized in that: this method is according to the principle of " transferring shallow stifled deeply ", utilized degradable organic blocking agent that oil reservoir is carried out the selective shut-off of long radius before this and a heat insulating belt was set thereafter, utilize resistant to elevated temperatures inorganic blocking agent to seal then, realize selective water plugging by pressure control and organic degraded simultaneously; Dark timing determines that according to oilwell water shutoff construction pump-in pressure needs clamp-on the concrete consumption of blocking agent, reaches the purpose of thoroughly carrying out the deep shutoff; Dark to transfer the back that the inorganic blocking agent of water-yielding stratum squeeze note is carried out shallow stifled, shallowly determines plug agent amount according to core intersection and blocking radius when stifled; The implementation step of this water shutoff technology is as follows:

(1), adopt the gel-like blocking agent to carry solid phase particles; squeeze note first slug; carry out the shutoff of selectivity deep: this blocking agent is by 0.3～0.5% polyacrylamide, 1.5～2.5% rubber grain, 1.0～3.0% resin fibre element; or other labile organic compound particle is mixed and forms, and consumption is 300～400m ³, squeeze pressure is controlled at 16～17MPa;

(2), adopt native powder class blocking agent squeeze note second slug, formation heat insulating belt: this blocking agent is 30% native powder, all the other aqueous solution for the water preparation of 20% cement, calculates consumption 40～50m by blocking radius 1.5m ³, pump-in pressure is controlled at below the 14MPa;

(3), adopt cement class or resin and shallow blocking agent squeeze note the 3rd slug of water glass class to seal, finish shallow stifled: this plug agent amount determines that according to core intersection blocking radius should reach more than the 1m, and design formulas is Q=π r ². Φ h, in the formula, Q-plug agent amount, m ³, h-core intersection, m, r-blocking radius, m, Φ-degree of porosity;

Pump-in pressure is controlled at below the 10MPa.