Hybrid Approach to Tailor Design Choices for Improved Risk Mitigation During Cement Job Design

Patent metadata

Field	Value
Publication number	US-2024254857-A1
Application number	US-202318104085-A
Country	US
Kind code	A1
Filing date	Jan 31, 2023
Priority date	Jan 31, 2023
Publication date	Aug 1, 2024
Grant date	—

Abstract

A method of designing a cement job may include: (a) selecting a cement job plan comprising: cement placement variables, wellbore construction variables, and subterranean formation properties; (b) calculating a predicted hydraulic pressure (P hydraulic ) of the cement job plan using a physics based hydraulic model; (c) calculating a pressure differential (ΔP) of the cement job plan using a data driven hydraulic model; (d) calculating a predicted observed surface pressure (P observed ) from the pressure differential (ΔP) and a predicted hydraulic pressure (P hydraulic ); (e) comparing the predicted observed surface pressure (P observed ) to a surface pressure requirement window, wherein steps (a)-(e) are repeated if the predicted observed surface pressure (P observed ) is within the surface pressure requirement window, wherein each repeated step of selecting comprises selecting at least one different cement placement variables than previously selected, or step (f) is performed if the if the predicted observed surface pressure (P observed ) is less than the surface pressure requirement; and (f) performing a cementing operation in a subterranean formation according to the cement job plan.

First claim

What is claimed is:

1 . A method of designing a cement job comprising:
(a) selecting a cement job plan comprising: cement placement variables, wellbore construction variables, and subterranean formation properties; (b) calculating a predicted hydraulic pressure (P hydraulic ) of the cement job plan using a physics based hydraulic model; (c) calculating a pressure differential (ΔP) of the cement job plan using a data driven hydraulic model; (d) calculating a predicted observed surface pressure (P observed ) from the pressure differential (ΔP) and a predicted hydraulic pressure (P hydraulic ); (e) comparing the predicted observed surface pressure (P observed ) to a surface pressure requirement window, wherein steps (a)-(e) are repeated if the predicted observed surface pressure (P observed ) is outside the surface pressure requirement window, wherein each repeated step of selecting comprises selecting at least one different cement placement variable or wellbore construction variable than previously selected, or step (f) is performed if the predicted observed surface pressure (P observed ) is inside the surface pressure requirement window; and (f) performing a cementing operation in a subterranean formation according to the cement job plan.

2 . The method of claim 1 wherein the cement placement variables comprise at least one variable selected from the group consisting of planned surface pumping pressures, planned pumping rates, planned cement composition, planned spacer composition, planned fluid volumes, planned fluid densities, and combinations thereof.

3 . The method of claim 1 wherein the wellbore construction variables comprise at least one variable selected from the group consisting of presence of bottom plugs, well true vertical depth (TVD), well true measured depth (TMD), inclination, and standoff value, dog leg severity, and combinations thereof.

4 . The method of claim 1 wherein the subterranean formation properties comprise at least one property selected from the group consisting of pore pressure, fracture gradient, bottomhole static temperature, wellbore temperature profile, flow potential factor, and combinations thereof.

5 . The method of claim 1 wherein the physics based hydraulic model comprises a computational fluid dynamics (CFD) model.

6 . The method of claim 1 wherein the data driven hydraulic model is specific to a geographic region and a wellbore cementing job type in the geographic region.

7 . The method of claim 6 wherein the cementing job type is at least one job selected from the group consisting of cementing a surface casing, cementing a conductor casing, cementing an intermediate casing, cementing a production casing, cementing a production liner, and combinations thereof.

8 . The method of claim 1 wherein the data driven hydraulic model comprises a regression model of observed pressure differential modeled as a function of cement placement variables, wellbore construction variables, and subterranean formation properties.

9 . The method of claim 8 wherein the regression model has the form of multilinear, parabolic, exponential, derivative, integral, hyperbolic, trigonometric, or combinations thereof.

10 . The method of claim 8 wherein the regression model includes a model factor selected from the group consisting of bottom plugs, flow rate difference of actual versus design, volume difference of actual versus design, spacer contact time, volume excess, well true vertical depth, flow potential factor, maximum equivalent circulating density versus fracture gradient, density difference of actual versus design, inclination, minimum hydrostatic pressure vs pore pressure, minimum density between successive fluid trains, standoff value, and combinations thereof.

11 . The method of claim 1 wherein selecting at least one different cement placement variable than previously selected comprises selecting a different planned pumping rate, a different planned cement composition, a different planned spacer composition, a different planned fluid volume, a different planned fluid density, or a combination thereof.

12 . The method of claim 1 further comprising selecting at least one different wellbore construction variable in step (e), the at least one different construction variable comprising at least one variable selected from the group consisting of presence of bottom plugs, well true vertical depth (TVD), well true measured depth (TMD), inclination, and standoff value, dog leg severity, and combinations thereof.

13 . The method of claim 1 further comprising selecting at least one different subterranean formation property in step (e), the at least one different construction variable comprising at least one property selected from the group consisting of pore pressure, fracture gradient, bottomhole static temperature, wellbore temperature profile, flow potential factor, and combinations thereof.

14 . A method comprising:
extracting planned cement job data and completed cement job data from a dataset of cement job data, wherein the planned cement job data and the completed cement job data correspond to one geographic region and one type of wellbore cementing job type in the geographic region, wherein the planned cement job data comprises at least planned surface pumping pressures, planned pumping volumes, planned pumping rates, and planned fluid densities, and wherein the completed cement job data comprises at least observed surface pumping pressures, observed pumping volumes, observed pumping rates, and observed fluid densities; correlating, using a regression model, an observed pressure differential ΔP, to all differences between the planned cement job data and the completed cement job data to generate a data driven hydraulic model; calculating a predicted hydraulic pressure (P hydraulic ) of a proposed cement job plan using a physics based hydraulic model, wherein the proposed cement job plan comprises at least proposed surface pumping pressures, proposed pumping volumes, proposed pumping rates, and proposed fluid densities; calculating a pressure differential (ΔP) of the proposed cement job using the data driven hydraulic model; calculating a predicted observed surface pressure (P predicted ) from the pressure differential (ΔP) and the predicted hydraulic pressure (P hydraulic ); comparing the predicted observed surface pressure (P predicted ) to a surface pressure requirement window and modifying at least one of the proposed surface pumping pressures, the proposed pumping volumes, the proposed pumping rates, and/or the proposed fluid densities in response to the comparison; and performing a cementing operation in a subterranean formation according to the proposed cement job plan.

15 . The method of claim 14 wherein the planned cement job data and the completed cement job data further comprises cement placement variables selected from the group consisting of planned pumping rate, a different planned cement composition, a different planned spacer composition, a different planned fluid volume, a different planned fluid density, or a combination thereof.

16 . The method of claim 14 wherein the planned cement job data and the completed cement job data further comprises wellbore construction variables selected from the group consisting of presence of bottom plugs, well true vertical depth (TVD), well true measured depth (TMD), inclination, and standoff value, dog leg severity, and combinations thereof.

17 . The method of claim 14 wherein the planned cement job data and the completed cement job data further comprises subterr

Assignees

• Halliburton Energy Services Inc

Inventors

• Jandhyala Siva Rama Krishna
• Yerubandi Kvvn Krishna Babu
• Jimenez Walmy Cuello

Classifications

• E21B47/06

  Measuring temperature or pressure · CPC title

• E21B33/14 Primary

  for cementing casings into boreholes · CPC title