# US 11,898,414 B2 · Method for filling oil-gas well of fractured oil-gas reservoir with isolation particles to reduce water and increase oil production

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- Number: US 11,898,414 B2
- Document ID: US11898414B2
- Status: Granted
- Kind: B2
- Application number: 17/427,068
- Filed: 2019-12-10
- Published: 2022-03-31
- Granted: 2024-02-13
- Earliest claimed: 2019-01-29
- Assignees: Anton Bailin Oilfield Technology (Beijing) Co., Ltd
- Applicants: Anton Bailin Oilfield Technology (Beijing) Co., Ltd
- Inventors: Bailin Pei; Songmei Zhang; Guojiang Feng; Hailong Wang
- Web page: https://patentgrep.com/patent/US11898414B2

## CPC

- C09K 8/512: containing cross-linking agents
- E21B 33/13: Methods or devices for cementing, for plugging holes, crevices or the like
- C09K 8/50: Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls (compositions for consolidating loose sand or the like around wells C09K8/56)
- C09K 8/508: macromolecular compounds {(C09K8/512 takes precedence)}
- E21B 43/04: Gravelling of wells
- E21B 43/16: Enhanced recovery methods for obtaining hydrocarbons
- E21B 43/26: by forming crevices or fractures
- E21B 47/06: Measuring temperature or pressure
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production comprises the following steps: (1) injecting a filling liquid carrying pack-off particles into a wellbore and a fracture via a wellhead, until a stratum crack/fracture extension pressure is reached or exceeded, or until an injection amount per unit injection pressure is close to zero, or until a preset filling amount of pack-off particles is reached; (2) launching production.

## Claims

### Claim 1

A method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production, the oil and gas well having a wellbore within which a screen pipe is provided, wherein a packer is provided at the top of the screen pipe, and the packer is provided with a filling channel for injecting filling liquid, wherein the method comprises the following steps:
(b1) continuously injecting a filling liquid carrying pack-off particles into an annular space and a fracture via the filling channel provided on the packer, until (i) a stratum crack/fracture extension pressure is reached or exceeded, (ii) an injection amount per unit injection pressure is close to zero, or (iii) a preset filling amount of pack-off particles is reached;
(b2) reducing an injection rate of the filling liquid, and allowing a filling pressure to be smaller than the stratum crack/fracture extension pressure, continuously injecting the filling liquid carrying pack-off particles until the annular space is fully filled with the pack-off particles or the preset filling amount of pack-off particles is reached; and
(b3) closing the filling channel and launching production, wherein the preset filling amount of pack-off particles is determined by:
V≥ρ·L0
wherein V is the preset filling amount of pack-off particles, L0 is a total length of the wellbore of the production section; and ρ is a filling density, and when the oil and gas well is a horizontal well, ρ has a value of 0.01-1.0 m3/m, and when the oil and gas well is a vertical well, ρ has a value of 0.01-5.0 m3/m.

### Claim 2 (depends on 1)

The method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production according to claim 1, wherein the screen pipe is a water control screen pipe.

### Claim 3 (depends on 1)

The method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production according to claim 1, wherein the injection rate of the filling liquid in the step (b2) is smaller than a liquid producing rate after the production is launched.

### Claim 4 (depends on 3)

The method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production according to claim 3, wherein a method for measuring the stratum crack/fracture extension pressure comprises the following steps:
(s1) continuously injecting filling liquid into the wellbore via the wellhead, gradually increasing the injection rate;
(s2) continuously measuring the pressure in the well until the pressure in the well experiences a rapid drop;
(s3) the highest pressure value before the rapid drop occurs is the stratum crack/fracture extension pressure.

### Claim 5 (depends on 1)

The method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production according to claim 1, wherein full filling of the pack-off particles in the annular space can be determined as follows:
when the filling liquid is injected at a constant rate, continuously measuring the pressure in the well until the pressure in the well increases to a set pressure, then determining that the annular space is fully filled with the pack-off particles; or
when the filling liquid is injected at a constant pressure, continuously measuring the flow rate of the filling liquid until the flow rate decreases to a set flow rate, then determining that the annular space is fully filled with the pack-off particles.

### Claim 6 (depends on 5)

The method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production according to claim 5, wherein the pack-off particles are of a spherical structure, and a particle size of the pack-off particles is 0.05-5 mm.

### Claim 7 (depends on 6)

The method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production according to claim 6, wherein a true density of the pack-off particles is 0.7-1.4 gram/cm3.

### Claim 8 (depends on 7)

The method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production according to claim 7, wherein the true density of the pack-off particles is 0.9-1.08 gram/cm3.

### Claim 9 (depends on 8)

The method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production according to claim 8, wherein the pack-off particles are made of polyethylene, high-density polyethylene, polypropylene, polyvinyl chloride or styrene divinylbenzene crosslinked copolymer.

### Claim 10 (depends on 9)

The method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production according to claim 9, wherein a concentration of the pack-off particles in the filling liquid is 1-20% by volume.