Management of Sustained Casing Pressure in Offshore Gas Wells by a Novel Casing-Surface Design that Suppress Gas Migration at the Casing-Cement Interface

2019 ◽  
Author(s):  
Alex William Mwang'ande ◽  
Hualin Liao ◽  
Long Zeng
Keyword(s):  
Gas Migration ◽  
Gas Wells ◽  
Surface Design ◽  
Cement Interface ◽  
Sustained Casing Pressure ◽  
Casing Pressure

Avoiding Sustained Casing Pressure in Gas wells using Self Healing Cement

2011 ◽  
Author(s):  
Salim Taoutaou ◽  
Jorge Andres Vargas Bermea ◽  
Pietro Bonomi ◽  
Bassam Elatrache ◽  
Christian Pasturel ◽  
...  
Keyword(s):  
Self Healing ◽  
Gas Wells ◽  
Sustained Casing Pressure ◽  
Casing Pressure

Mitigation of Annulus Pressure Buildup in Offshore Gas Wells by Determination of Top of Cement

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Alex W. Mwang’ande ◽  
Hualin Liao ◽  
Long Zeng
Keyword(s):  
Field Data ◽  
Gas Wells ◽  
Gas Well ◽  
Pressure Buildup ◽  
Cheap Method ◽  
Calculation Results ◽  
Sustained Casing Pressure ◽  
Casing Pressure ◽  
Mitigation Methods

Annulus pressure buildup (APB) is still a serious problem in offshore gas wells, which threatens the safety of wells for the entire phases of drilling, completion, and production. The existing methods for mitigating APB are technically complex and highly costly. Setting top of cement (TOC) below the outer casing shoe to mitigate APB is easy to implement and can significantly reduce costs. However, there are no unified methods of determining TOC for this purpose. Nevertheless, existing petroleum standards give ambiguous regulations on the setting of TOC. This article brings a new and cheap method of mitigating APB by determining best TOC settings using a mathematical model for calculating APB from both annulus fluid expansion (AFE) and sustained casing pressure (SCP). Field data from gas well X are inputted to the model to describe how it serves this purpose. Calculation results for well X show that setting TOC's above and below the upper casing shoes for production and intermediate casings annuli, respectively, can greatly avoid the problem of APB and the costs associated with the existing mitigation methods. This technique can be used to other wells following the same procedures. The developed model reduced greatly the ambiguity of TOC determination as it helps to get the clear TOC combinations that control APB at the lowest cost of well construction while maintaining good and safe well operation.

Risk and Remediation of Irreducible Casing Pressure at Petroleum Wells

2014 ◽  
pp. 155-180 ◽  
Author(s):  
Andrew K. Wojtanowicz
Keyword(s):  
Oil Well ◽  
Gas Migration ◽  
Excessive Pressure ◽  
Wet Gas ◽  
Regulatory Approach ◽  
Sustained Casing Pressure ◽  
Small Cracks ◽  
Petroleum Wells ◽  
Casing Pressure ◽  
Well Cement

Oil well cement problems such as small cracks or channels may result in gas migration and lead to irreducible pressure at the casing head. Irreducible casing pressure also termed, Sustained Casing Pressure (SCP) is hazardous for a safe operation and the affected wells cannot be terminated without remedial operations. It is believed that even very small leaks might lead to continuous emissions of gas to the atmosphere. In the chapter, the author describes physical mechanisms of irreducible casing pressure and qualifies the associated risk by showing statistical data from the Gulf of Mexico and discussing the regulatory approach. This chapter also introduces a new approach to evaluate risk of casing pressure by computing a probable rate of atmospheric emissions from wells with failed casing heads resulting from excessive pressure. Also presented is a new method for assessing potential for self-plugging of such wells flowing wet gas as the gas migration channels could be plugged off by the condensate.

Avoiding Sustained Casing Pressure in Gas wells using Self Healing Cement

2011 ◽  
Author(s):  
Salim Taoutaou ◽  
Jorge Andres Vargas Bermea ◽  
Pietro Bonomi ◽  
Bassam Elatrache ◽  
Christian Pasturel ◽  
...  
Keyword(s):  
Self Healing ◽  
Gas Wells ◽  
Sustained Casing Pressure ◽  
Casing Pressure
Sign in / Sign up

Export Citation Format

Share Document