CN101915079A - Integrated de-plugging yield increasing process - Google Patents

Abstract

The invention relates to an integrated de-plugging yield increasing process. In the process, plugging agents are extruded into a well, wherein the plugging agents comprise a gel plugging agent and a particle plugging agent; for an oil deposit deeper than 2000 m, the particle plugging agent is firstly injected, and the gel plugging agent is subsequently injected; and for an oil deposit not more than 2000 m, the gel plugging agent is independently injected. The gel plugging agent comprises the following components: 0.2-0.5% of polyacrylamide dry powder, 0.2-0.6% of resin accelerating agent, 0.2-0.5% of organic chromium cross-linking agent and the balance of water. The particle plugging agent comprises the following components: 0.1-0.3% of water solution of polyacrylamide and an oil-soluble particle plugging agent. The process is applicable to oil-water wells with channeling caused by great interlayer permeability difference, thin interlayer or sandwich layer, unclear production fluid profile and water injection profile or poor well cementation quality, and the injection speed and the injection pressure are strictly controlled, so that the plugging agents selectively enter a highly water-absorbing interval or a water producing interval, and damage to an oil-bearing interval is reduced as far as possible.

Description

A kind of integrated de-plugging yield increasing process

Technical field

The present invention relates to a kind of water plugging and profiling technology in the oil field development, particularly a kind of integrated de-plugging yield increasing process.

Background technology

The meaning of profile control and water plugging work is very important, its objective is the output of control oil-field brine, keeps stratum energy.Because of oil reservoir is inhomogeneous, have high permeability zone and in, less permeable layer, when water flood recovery, the water always high permeability zone of longshore current dynamic resistance minimum is charged into oil well, produces higher waterflood recovery efficiency factor, and involve less than in, less permeable layer, so waterflood recovery efficiency factor is not high.As time goes on, water washes away high permeability zone, forms the extra-high-speed permeable formation.At this moment, water invalid circulation in the loop of flood pattern, oil reservoir and sewerage treatment and re-injection system formation, waterflood recovery efficiency factor has just no longer improved.Therefore, must from water injection well or these high permeability zones of oil well plugging and extra-high-speed permeable formation force the water of injection enter oil saturation high, less permeable layer, to reach the purpose that improves oil recovery factor.It should be noted that transfer drive technology has two key problem in technology, the one, must with the viscosity of the preferred displacing agent of rock core, omit water-front advance velocity according to permeability faster than new water-entering interval to guarantee the profile control agent fltting speed; The 2nd, reduce the injury of enhancement Layer when clamp-oning profile control agent as far as possible, injection pressure must be greater than the startup pressure reduction of profile control interval, less than the startup pressure reduction of strengthening interval.Rock core (or artificial simulation rock core) actual measurement can be used in this two aspect.Oilwell water shutoff also has similar problem, because it is limited to stop up radius, units increased in production and period of validity are all very little, so concerning the porosity oil reservoir, unless holostrome water logging otherwise should not adopt the water blockoff measure to certain interval water outlet in the layer.And to block Fractured Reservoir with Bottom Water, owing to can't adjust at well, can only utilize the non-homogeneity in this class oil field to carry out water blockoff at oil well, begin large fracture is blocked, though like this exhalant canal is blocked, the oil discharge passage of the gap that also will be communicated with large fracture simultaneously blocks, so effect is also undesirable.Develop into the blocking agent of infiltrative stifled large fracture later on, effect makes moderate progress.But because the displacement pressure reduction of sillar system is very big, permeability decrease is very big in the large fracture, and filtrational resistance is bigger, and pressure is suppressed higherly in the large fracture, can not form big displacement pressure reduction, and the oil in the sillar system still can't get out.

Summary of the invention

In order to overcome the defective of above-mentioned prior art, the object of the present invention is to provide a kind of integrated de-plugging yield increasing process, this technology is suitable for that interlayer permeability difference is big, interlayer or interlayer is thin, production profile, intake profile is unclear or cementing quality difference and cause the oil-water well of scurrying groove, control injection rate and injection pressure, make plugging agent optionally enter high water-intake interval or water yield formation section, reduce the injury of oil-containing interval as far as possible.

In order to achieve the above object, technical scheme of the present invention realizes in the following manner:

A kind of integrated de-plugging yield increasing process may further comprise the steps:

One, when well is well, utilize original water injection string or flow string in the well, inject plugging agent from oil pipe; When well is oil well, trip out down-hole pipe and roofbolt, logical thorn inspection, and in well, transfer operating tool string, from operating tool string, inject plugging agent;

Two, the plugging agent described in the step 1 divides two kinds of frozen glue class plugging agent and granular pattern plugging agents, the stratum exhalant canal is more than 2000 meters during oil reservoir, inject the granular pattern plugging agent earlier, follow-up injection frozen glue class plugging agent, the volume ratio of granular pattern plugging agent and frozen glue class plugging agent is: 1: 2-5; Oil reservoir injects frozen glue class plugging agent separately during smaller or equal to 2000 meters;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2-0.6% resinae setting accelerator, the 0.2-0.5% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.2-0.5%, all the other components are water; The component of granular pattern plugging agent is: mass concentration is polyacrylamide solution and the oil-soluble particle blocking agent of 0.1-0.3%, the mass ratio of polyacrylamide solution and oil-soluble particle blocking agent is: 85-95: 5-15, injection viscosity≤the 50mPa.s of plugging agent, become adhesiveness greater than 100mpa.s, water plugging rate 〉=95%; The total amount of injecting plugging agent is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be the sandstone acid solution of 5-15%, replace clear water; The consumption of sandstone acid solution is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, after closing well 24-72 hour, the well recovery water filling that drives a well, oil well returns to normal production after then driving a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

$Q=\frac{0.07675\·K\·h\·\mathrm{\ΔP}}{\mathrm{\μ}\·(\ln \frac{r_e}{r_w}+S)}$

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor

In practice of construction design, generally according to shutoff purpose difference, adopt different injection rates: permeability is lower than the LOW PERMEABILITY RESERVOIR of 50md, and injection rate is no more than 10m ³/ h reaches shutoff crack and macropore, reduces the purpose of formation contaminant and orderly start low-permeability layer; Better to rerum natura, the permeability that series of strata are single is not less than the oil reservoir of 50md, and injection rate is 8-12m ³/ h.

Process characteristic of the present invention is: can adjust the intake profile on water filling stratum more fully by injecting plugging agent, the exhalant canal that shutoff is big, the sandstone acid that has oil reservoir protection feature by follow-up injection, less permeable layer sweep efficiency and permeability in can strengthening, increased the water injection rate of middle less permeable layer, improve oil well productivity, reach the effect of oil well production increasing, well step-down augmented injection, energy efficiency; Technology success rate height, construction safety is reliable, can adjust the intake profile on water filling stratum by plugging agent, the exhalant canal that shutoff is big, the sealing ratiod height, simple to operate.Can open oil flow channel by injecting sandstone acid, reduce surface tension, and it be little to have corrosivity, the characteristics of Environmental Safety.

The specific embodiment

Embodiment one (well):

Present embodiment may further comprise the steps:

One, when well is well, utilize original water injection string or flow string in the well, clamp-on plugging agent from oil pipe;

Two, the plugging agent described in the step 1 divides two kinds of frozen glue class plugging agent and granular pattern plugging agents, the stratum water outlet is at oil reservoir more than 2000 meters, inject granular pattern plugging agent, follow-up injection frozen glue class plugging agent, the volume ratio of granular pattern plugging agent and frozen glue class plugging agent: 1: 2 earlier;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.4% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.5%, all the other components are water; The component of granular pattern plugging agent is: mass concentration is 0.2% polyacrylamide solution and oil-soluble particle blocking agent, the mass ratio of polyacrylamide solution and oil-soluble particle blocking agent is: 90: 10, the injection viscosity of plugging agent is 45mPa.s, the one-tenth adhesiveness is 110mpa.s, water plugging rate 96%; The total amount of injecting plugging agent is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be 10% sandstone acid solution, replace clear water; The consumption of sandstone acid solution is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 48 hours, the well recovery water filling that drives a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

$Q=\frac{0.07675\·K\·h\·\mathrm{\ΔP}}{\mathrm{\μ}\·(\ln \frac{r_e}{r_w}+S)}$

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor

Present embodiment water injection pressure rising 3MPa, injectivity index decline 12m ³/ (dMPa); Pressure index rising 3.6MPa illustrates that high permeability zone or big water outlet duct have obtained effective shutoff; Intake profile has obtained effective improvement, and strong water accepting layer has obtained effective shutoff, and water absorption descends, and has started not water accepting layer, and the layer of suction difference is strengthened.Oil well output rises on every side, and water outlet reduces.

Embodiment two (well):

Present embodiment may further comprise the steps:

One, when well is well, utilize original water injection string or flow string in the well, clamp-on plugging agent from oil pipe;

Two, the plugging agent described in the step 1 divides two kinds of frozen glue class plugging agent and granular pattern plugging agents, the stratum exhalant canal is at oil reservoir more than 2000 meters, inject granular pattern plugging agent, follow-up injection frozen glue class plugging agent, the volume ratio of granular pattern plugging agent and frozen glue class plugging agent: 1: 4 earlier;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.4% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.3%, all the other components are water; The component of granular pattern plugging agent is: mass concentration is 0.3% polyacrylamide solution and oil-soluble particle blocking agent, the mass ratio of polyacrylamide solution and oil-soluble particle blocking agent is: 85: 15, the injection viscosity 40mPa.s of plugging agent becomes adhesiveness 130mpa.s, water plugging rate 95%; The total amount of injecting plugging agent is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be 7.5% sandstone acid solution, replace clear water; The consumption of sandstone acid solution is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 72 hours, the well recovery water filling that drives a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

$Q=\frac{0.07675\·K\·h\·\mathrm{\ΔP}}{\mathrm{\μ}\·(\ln \frac{r_e}{r_w}+S)}$

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor

Present embodiment water injection pressure rising 4MPa, injectivity index decline 13m ³/ (dMPa); Pressure index rising 3.5MPa illustrates that high permeability zone or big water outlet duct have obtained effective shutoff; Intake profile has obtained effective improvement, and strong water accepting layer has obtained effective shutoff, and water absorption descends, and has started not water accepting layer, and the layer of suction difference is strengthened.Oil well output rises on every side, and water outlet reduces.

Embodiment three (well)

Present embodiment may further comprise the steps:

One, when well is well, utilize original water injection string or flow string in the well, clamp-on plugging agent from oil pipe;

Two, oil reservoir injects the plugging agent of frozen glue class separately less than 2000 meters;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.4% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.4%, all the other components are water; The injection viscosity of plugging agent is 45mPa.s, becomes adhesiveness 115mpa.s, water plugging rate 97%; The total amount of injecting plugging agent is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be 10% sandstone acid solution, replace clear water; The consumption of sandstone acid solution is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 48 hours, the well recovery water filling that drives a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

$Q=\frac{0.07675\·K\·h\·\mathrm{\ΔP}}{\mathrm{\μ}\·(\ln \frac{r_e}{r_w}+S)}$

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor

Present embodiment water injection pressure rising 5MPa, injectivity index decline 15m ³/ (dMPa); Pressure index rising 4MPa illustrates that high permeability zone or big water outlet duct have obtained effective shutoff; Intake profile has obtained effective improvement, and strong water accepting layer has obtained effective shutoff, and water absorption descends, and has started not water accepting layer, and the layer of suction difference is strengthened.Oil well output rises on every side, and water outlet reduces.

Embodiment four (oil well):

Present embodiment may further comprise the steps:

One, when well is oil well, trip out down-hole pipe and roofbolt, logical thorn inspection, and in well, transfer operating tool string, from operating tool string, inject plugging agent;

Two, the plugging agent described in the step 1 divides two kinds of frozen glue class plugging agent and granular pattern plugging agents, the stratum exhalant canal is at oil reservoir more than 2000 meters, inject granular pattern plugging agent, follow-up injection frozen glue class plugging agent, the volume ratio of granular pattern plugging agent and frozen glue class plugging agent: 1: 3 earlier;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.4% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.4%, all the other components are water; The component of granular pattern plugging agent is: mass concentration is 0.2% polyacrylamide solution and oil-soluble particle blocking agent, the mass ratio of polyacrylamide solution and oil-soluble particle blocking agent is: 95: 5, the injection viscosity 30mPa.s of plugging agent becomes adhesiveness 130mpa.s, water plugging rate 95%; The total amount of injecting plugging agent is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be 10% sandstone acid solution, replace clear water; The consumption of sandstone acid solution is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 48 hours, and oil well returns to normal production after then driving a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

$Q=\frac{0.07675\·K\·h\·\mathrm{\ΔP}}{\mathrm{\μ}\·(\ln \frac{r_e}{r_w}+S)}$

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor

Present embodiment construction back well water descends steadily, and daily oil production increases sharply.

Embodiment five (oil well):

Present embodiment may further comprise the steps:

One, when well is oil well, trip out down-hole pipe and roofbolt, logical thorn inspection, and in well, transfer operating tool string, from operating tool string, inject plugging agent;

Two, oil reservoir injects the plugging agent of frozen glue class separately less than 2000 meters;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.3% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.5%, all the other components are water; The injection viscosity 45mPa.s of plugging agent becomes adhesiveness 130mpa.s, water plugging rate 97%; The total amount of injecting plugging agent is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be the sandstone acid solution of 5-15%, replace clear water; The consumption of sandstone acid solution is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 24 hours, and oil well returns to normal production after then driving a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

$Q=\frac{0.07675\·K\·h\·\mathrm{\ΔP}}{\mathrm{\μ}\·(\ln \frac{r_e}{r_w}+S)}$

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor

Present embodiment construction back well water descends steadily, and daily oil production increases sharply.

Embodiment six (oil well)

Present embodiment may further comprise the steps:

One, when well is oil well, trip out down-hole pipe and roofbolt, logical thorn inspection, and in well, transfer operating tool string, from operating tool string, inject plugging agent;

Two, the plugging agent described in the step 1 divides two kinds of frozen glue class plugging agent and granular pattern plugging agents, the stratum exhalant canal is at oil reservoir more than 2000 meters, inject granular pattern plugging agent, follow-up injection frozen glue class plugging agent, the volume ratio of granular pattern plugging agent and frozen glue class plugging agent: 1: 3 earlier;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.3% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.5%, all the other components are water; The component of granular pattern plugging agent: mass concentration is 0.3% polyacrylamide solution and oil-soluble particle blocking agent, the mass ratio of polyacrylamide solution and oil-soluble particle blocking agent is: 90: 10, the injection viscosity 45mPa.s of plugging agent becomes adhesiveness 115mpa.s, water plugging rate 96%; The total amount of injecting plugging agent is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be the sandstone acid solution of 5-15%, replace clear water; The consumption of sandstone acid solution is calculated as follows:

$V=\mathrm{\π}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{r}_i\×h_i\×{\mathrm{\φ}}_i$

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 24 hours, and oil well returns to normal production after then driving a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

$Q=\frac{0.07675\·K\·h\·\mathrm{\ΔP}}{\mathrm{\μ}\·(\ln \frac{r_e}{r_w}+S)}$

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor

Present embodiment construction back well water descends steadily, and daily oil production increases sharply.

Claims (9)

1. an integrated de-plugging yield increasing process is characterized in that, may further comprise the steps:

One, when well is well, utilize original water injection string or flow string in the well, clamp-on plugging agent from oil pipe; When well is oil well, trip out down-hole pipe and roofbolt, logical thorn inspection, and in well, transfer operating tool string, from operating tool string, inject plugging agent;

Two, the plugging agent described in the step 1 divides two kinds of frozen glue class plugging agent and granular pattern plugging agents, the stratum exhalant canal is more than 2000 meters during oil reservoir, inject granular pattern plugging agent, follow-up injection frozen glue class plugging agent, the volume ratio of granular pattern plugging agent and frozen glue class plugging agent: 1: 2-5 earlier; Oil reservoir injects frozen glue class plugging agent separately during smaller or equal to 2000 meters;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2-0.6% resinae setting accelerator, the 0.2-0.5% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.2-0.5%, all the other components are water; The component of granular pattern plugging agent is: mass concentration is polyacrylamide solution and the oil-soluble particle blocking agent of 0.1-0.3%, the mass ratio of polyacrylamide solution and oil-soluble particle blocking agent is: 85-95: 5-15, injection viscosity≤the 50mPa.s of plugging agent, become adhesiveness greater than 100mpa.s, water plugging rate 〉=95%; The total amount of injecting plugging agent is calculated as follows:

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval;

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be the sandstone acid solution of 5-15%, replace clear water; The consumption of sandstone acid solution is calculated as follows:

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval;

Five, after closing well 24-72 hour, the well recovery water filling that drives a well, oil well returns to normal production after then driving a well.

2. a kind of integrated de-plugging yield increasing process according to claim 1, it is characterized in that, in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor.

3. a kind of integrated de-plugging yield increasing process according to claim 1 and 2 is characterized in that, may further comprise the steps:

One, when well is well, utilize original water injection string or flow string in the well, clamp-on plugging agent from oil pipe;

Two, the plugging agent described in the step 1 divides two kinds of frozen glue class plugging agent and granular pattern plugging agents, the stratum water outlet is at oil reservoir more than 2000 meters, inject granular pattern plugging agent, follow-up injection frozen glue class plugging agent, the volume ratio of granular pattern plugging agent and frozen glue class plugging agent: 1: 2 earlier;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.4% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.5%, all the other components are water; The component of granular pattern plugging agent is: mass concentration is 0.2% polyacrylamide solution and oil-soluble particle blocking agent, the mass ratio of polyacrylamide solution and oil-soluble particle blocking agent is: 90: 10, the injection viscosity of plugging agent is 45mPa.s, the one-tenth adhesiveness is 110mpa.s, water plugging rate 96%; The total amount of injecting plugging agent is calculated as follows:

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.Sm during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be 10% sandstone acid solution, replace clear water; The consumption of sandstone acid solution is calculated as follows:

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 48 hours, the well recovery water filling that drives a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor.

4. a kind of integrated de-plugging yield increasing process according to claim 1 is characterized in that, may further comprise the steps:

One, when well is well, utilize original water injection string or flow string in the well, clamp-on plugging agent from oil pipe;

Two, the plugging agent described in the step 1 divides two kinds of frozen glue class plugging agent and granular pattern plugging agents, the stratum exhalant canal is at oil reservoir more than 2000 meters, inject granular pattern plugging agent, follow-up injection frozen glue class plugging agent, the volume ratio of granular pattern plugging agent and frozen glue class plugging agent: 1: 4 earlier;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.4% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.3%, all the other components are water; The component of granular pattern plugging agent is: mass concentration is 0.3% polyacrylamide solution and oil-soluble particle blocking agent, the mass ratio of polyacrylamide solution and oil-soluble particle blocking agent is: 85: 15, the injection viscosity 40mPa.s of plugging agent becomes adhesiveness 130mpa.s, water plugging rate 95%; The total amount of injecting plugging agent is calculated as follows:

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be 7.5% sandstone acid solution, replace clear water; The consumption of sandstone acid solution is calculated as follows:

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 72 hours, the well recovery water filling that drives a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor.

5. a kind of integrated de-plugging yield increasing process according to claim 1 and 2 is characterized in that, may further comprise the steps:

One, when well is well, utilize original water injection string or flow string in the well, clamp-on plugging agent from oil pipe;

Two, oil reservoir injects frozen glue class plugging agent separately less than 2000 meters;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.4% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.4%, all the other components are water; The injection viscosity of plugging agent is 45mPa.s, becomes adhesiveness 115mpa.s, water plugging rate 97%; The total amount of injecting plugging agent is calculated as follows:

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval;

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be 10% sandstone acid solution, replace clear water; The consumption of sandstone acid solution is calculated as follows:

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval;

Five, closing well is after 48 hours, the well recovery water filling that drives a well.

6. a kind of integrated de-plugging yield increasing process according to claim 1 and 2 is characterized in that, may further comprise the steps:

One, when well is oil well, trip out down-hole pipe and roofbolt, logical thorn inspection, and in well, transfer operating tool string, from operating tool string, inject plugging agent;

Two, the plugging agent described in the step 1 divides two kinds of frozen glue class plugging agent and granular pattern plugging agents, the stratum exhalant canal is at oil reservoir more than 2000 meters, inject granular pattern plugging agent, follow-up injection frozen glue class plugging agent, the volume ratio of granular pattern plugging agent and frozen glue class plugging agent: 1: 3 earlier;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.4% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.4%, all the other components are water; The component of granular pattern plugging agent is: mass concentration is 0.2% polyacrylamide solution and oil-soluble particle blocking agent, the mass ratio of polyacrylamide solution and oil-soluble particle blocking agent is: 95: 5, the injection viscosity 30mPa.s of plugging agent becomes adhesiveness 130mpa.s, water plugging rate 95%; The total amount of injecting plugging agent is calculated as follows:

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be 10% sandstone acid solution, replace clear water; The consumption of sandstone acid solution is calculated as follows:

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 48 hours, and oil well returns to normal production after then driving a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor.

7. a kind of stifled separating-the body yield-increasing technique according to claim 1 and 2 is characterized in that, may further comprise the steps:

One, when well is oil well, trip out down-hole pipe and roofbolt, logical thorn inspection, and in well, transfer operating tool string, from operating tool string, inject plugging agent;

Two, oil reservoir injects the plugging agent of frozen glue class separately less than 2000 meters;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.3% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.5%, all the other components are water; The injection viscosity 45mPa.s of plugging agent becomes adhesiveness 130mpa.s, water plugging rate 97%; The total amount of injecting plugging agent is calculated as follows:

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be the sandstone acid solution of 5-15%, replace clear water; The consumption of sandstone acid solution is calculated as follows:

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 24 hours, and oil well returns to normal production after then driving a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor.

8. a kind of integrated de-plugging yield increasing process according to claim 1 and 2 is characterized in that, may further comprise the steps:

One, when well is oil well, trip out down-hole pipe and roofbolt, logical thorn inspection, and in well, transfer operating tool string, from operating tool string, inject plugging agent;

Two, the plugging agent described in the step 1 divides two kinds of frozen glue class plugging agent and granular pattern plugging agents, the stratum exhalant canal is at oil reservoir more than 2000 meters, inject granular pattern plugging agent, follow-up injection frozen glue class plugging agent, the volume ratio of granular pattern plugging agent and frozen glue class plugging agent: 1: 3 earlier;

Three, the component of frozen glue class plugging agent is: account for polyacrylamide dry powder, 0.2% resinae setting accelerator, the 0.3% Organic Chromium crosslinking agent of frozen glue class plugging agent gross mass 0.5%, all the other components are water; The component of granular pattern plugging agent: mass concentration is 0.3% polyacrylamide solution and oil-soluble particle blocking agent, the mass ratio of polyacrylamide solution and oil-soluble particle blocking agent is: 90: 10, the injection viscosity 45mPa.s of plugging agent becomes adhesiveness 115mpa.s, water plugging rate 96%; The total amount of injecting plugging agent is calculated as follows:

In the formula: V---plugging agent consumption, m ³

r _i---the treatment radius of i interval, select fixed value 1.5m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Four, inject plugging agent after, at normal temperatures again in well implantation concentration be the sandstone acid solution of 5-15%, replace clear water; The consumption of sandstone acid solution is calculated as follows:

In the formula: V---sandstone acid solution usage, m ³

r _i---the treatment radius of i interval, m selects fixed value 1m during actual the use;

h _i---the thickness of i interval, m;

Φ _i---the effecive porosity of i interval.

Five, closing well is after 24 hours, and oil well returns to normal production after then driving a well.

More than in each step, when injecting plugging agent and sandstone acid solution, must control inject pump pressure, select the highest construction pump pressure that two principles are arranged: the one, be not more than flood pattern pressure, the 2nd, the construction pump pressure is injected plugging agent, for guaranteeing plugging agent shutoff target zone effectively less than the oil reservoir fracture pressure of converting to well head, minimizing is to the infringement of non-target zone, and plugging agent and sandstone acid solution injection pressure are determined by following formula:

0.8P it is broken 〉=P notes 〉=P ground+Pfr-PH

P breaks-the processing layer fracture pressure in the formula, MPa;

P notes-plugging agent squeeze pressure, MPa;

P ground-processing layer strata pressure, MPa;

Head of liquid in the Pfr-pit shaft, MPa;

PH-handles well head of liquid, MPa.

Blocking agent and sandstone acid solution inject express delivery and are determined by following formula:

Q-injection rate in the formula, m ³/ h;

K-handles the effective mean permeability of interval, * 10 ^-3μ m ²

Δ P-injects pressure reduction, MPa;

M-profile control agent viscosity, mPas;

r _e-drainage radius, m;

r _w-wellbore radius, m;

The S-skin factor.

9. a kind of integrated de-plugging yield increasing process according to claim 1 and 2 is characterized in that, may further comprise the steps: permeability is lower than the LOW PERMEABILITY RESERVOIR of 50md, and injection rate is no more than 10m ³/ h; Better to rerum natura, the permeability that series of strata are single is not less than the oil reservoir of 50md, and injection rate is 8-12m ³/ h.