Determining the quality of data gathered in a wellbore in a subterranean formation

Patent metadata

Field	Value
Publication number	US-9988902-B2
Application number	US-201414516854-A
Country	US
Kind code	B2
Filing date	Oct 17, 2014
Priority date	Oct 18, 2013
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

Methods for determining the quality of data gathered in a wellbore in a subterranean formation including (a) collecting a formation fluid sample in the wellbore in the subterranean formation using a formation tester for receiving the formation fluid, wherein the formation tester is lowered to at least one depth in the wellbore in the subterranean formation by a conveyor; (b) acquiring a wellbore measurement (“WM”) from the least one depth with the formation tester; (c) determining from the WM a measured quality value (“MQV”); (d) assigning a threshold value (“TV”) to the MQV; (e) assigning a range value (“RV”) to the MQV, based on geometric scaling of the TV, the RV defining the limits of the MQV above and below the TV; and (f) calculating a score value (“SV”) based on the MQV, the TV, and the RV, wherein the SV is a number between 0 and 2*TV, and wherein the quality of the WM increases as the SV increases.

First claim

The invention claimed is:

1. A method comprising:
collecting a formation fluid sample in a wellbore in a subterranean formation using a formation tester for receiving the formation fluid sample, wherein the formation tester is lowered to at least one depth in the wellbore in the subterranean formation by a conveyor;
acquiring, independent of the formation fluid sample, a wellbore measurement (“WM”) from the at least one depth with the formation tester;
determining from the WM a measured quality value (“MQV”);
assigning a threshold value (“TV”) and a range value (“RV”) to the MQV, the RV being assigned based on geometric scaling of the TV, and the RV defining limits of the MQV above and below the TV;
calculating a score value (“SV”) for the WM based on the MQV, the TV, and the RV, wherein the SV is a number between 0 and 2*TV, and the SV indicates a quality of the WM;
providing an indication of the SV calculated for the WM to indicate a quality associated with the collected formation fluid sample; and
initiating another acquisition, by the formation tester, another WM from the at least one depth in the wellbore when the SV indicates that the quality of the WM is below a validity threshold.

2. The method of claim 1 , wherein the score value is determined using a formula comprising:

SV
=

TV
2

⁢

(

1
-

log
⁡

(


MQV


TV

)

log
⁡

(
RV
)

)

,

⁢

if
⁢

:

⁢

⁢

(

TV
RV

)

≤
TV
≤

(

TV
*
RV

)

.

3. The method of claim 1 , wherein the score value is determined using a formula comprising:

SV
=

TV
2

⁢

(

1
+

log
⁡

(


MQV


TV

)

log
⁡

(
RV
)

)

,

⁢

if
⁢

:

⁢

⁢

(

TV
RV

)

≥
TV
≥

(

TV
*
RV

)

.

4. The method of claim 1 , wherein a quality attribute is assigned to the WM based on the SV, and the WM is acquired before the formation fluid sample is collected.

5. The method of claim 4 , wherein an invalid quality attribute is assigned to the WM when the SV is less than the TV, and a valid quality attribute is assigned to the WM when the SV is greater than or equal to the TV.

6. The method of claim 4 , wherein a high quality attribute is assigned to the WM when the SV is between 2*TV and greater than 1.75*TV, a good quality attribute is assigned to the WM when the SV is between 1.75*TV and greater than 1.25*TV, a valid quality attribute is assigned to the WM when the SV is between 1.25*TV and greater than 0.75*TV, a fair quality attribute is assigned to the WM when the SV is between 0.75*TV and greater than 0.5*TV, and a low quality attribute is assigned to the WM when the SV is between 0.5*TV and 0.

7. The method of claim 1 , wherein the WM is selected from the group consisting of drawdown pressure, buildup pressure, buildup stability, formation total compressibility, isotropic formation permeability, spherical formation permeability, mudcake permeability, mudcake thickness, wellbore mud hydrostatic pressure, drawdown flow rate, mud filtrate invasion rate, wellbore radius, buildup time, drawdown time, transition time to pseudo-steady state, invasion time, viscosity, formation porosity, and any combination thereof.

8. The method of claim 1 , wherein the MQV is selected from the group consisting of drawdown mobility, pressure stability, pressure stability standard deviation, temperature stability, temperature stability standard deviation, supercharge pressure, radius of investigation, overbalance pressure, and any combination thereof.

9. The method of claim 1 , wherein the MQV comprises an overbalance pressure determined by a difference between wellbore mud hydrostatic pressure and buildup pressure, and further comprising assigning a mud set quality attribute to the MQV

Assignees

• Proett Mark
• Eyuboglu Sami
• Halliburton Energy Services Inc

Inventors

• Proett Mark
• Eyuboglu Sami

Classifications

• E21B49/10 Primary

  using side-wall fluid samplers or testers · CPC title