Well Control - Abnormal pore pressures

For exploratory well, the prediction of abnormally pressured formations can be difficult. Correlation with nearby wells will provide the most reliable information. Before drilling a wildcat, seismic …

Contingency Stock Levels - Well Control

this article describes the contingency Stock Levels for Well Control.

Contingency Fluid

Requirement for contingency fluid for onshore operations depends on proximity of supply base.

For offshore…

Well Control Equipment and Procedures - Standards

  • All BOP equipment and drillstring equipment shall be in a serviceable and fully tested condition. BOP is to be tested as per API every 2 weeks as a minimum.
  • All Stripping drill requirements must be…

Setting of retainers, bridge plugs and packers

Retainers, bridge plugs and packers should be set as deep as possible. With a shallow packer or plug, a higher fluid gradient will be necessary to control abnormal pressures which may build up below…

Well Control Safety

It is the Company drilling supervisors' responsibility to ensure that all drilling and workover operations are conducted in a manner which provides safe and complete well control. In this capacity he…

Responsibilities for Well Control

Primary well control shall be maintained at all times. In the event secondary control becomes necessary, the well shall be brought back under control as safely as possible.

For each well control…

Well Control Drills

In order to train the drill crew in the procedures that apply in connection with well control, or reinstatement of lost well control barriers, drills shall be conducted. The drills shall be conducted…

Pre-Kick Planning

This article describes the planning issues to be addressed to ensure successful well control.

Kick Control Work-Sheet

A kick control worksheet shall be used to pre-record the data required for…

Blowout contingency planning

Main features of a blowout contingency plan shall include:

  • single phone call approach from the wellsite, to activate the plan. This will allow field personnel to concentrate their efforts on…

Hydrogen Sulphide (H2S)

Hydrogen sulphide (H2S) is one of the most toxic of all naturally occurring gases. It occurs world-wide in various concentrations in the scope of the drilling industry. It is explosive and heavier…

Well Control - High Pressure Wells

Kick control when drilling high pressure wells (philosophy, drilling procedure and well control equipment)

1 Well control philosophy

The BOP and surface system, including the drillstring, should be…

Communicating information

Before commencing operations on a well, a planning meeting should be held to discuss the drilling programme. Company, Contractor, and appropriate Service Company personnel should attend the meeting.

The…

Well Control Responsibilities

On both Company and Contractor-owned drilling and workover rigs (regardless of the type of contract) it is the responsibility of the Company representative to ensure that drilling operations are…

Well Control - Well Design

This article descrobes the drilling program and other Well Design considerations for Well Control

1 Drilling programme

The drilling programme is based on the information provided by the subsurface…

Well Control Standards

This article describes the standards applicable for Well Control.

General Standards

  • All wells drilled shall comply with the guidelines as specified in API RP 53.
  • All pressure containing well control…

Well Control - H2S

During drilling and workover operations the consequences of leaks or kicks with sour gas or crude may be very serious. Personnel can be incapacitated by relatively low concentrations of H2S in a very…

Discussion on Suitability of Barriers (well control)

this article discuss the suitability of barrier for the following:

  1. Fluids
  2. Mechanical Barriers in completed Wells
  3. Sub-surface Safety Valve
  4. Sustension of a perforated well (with xmas tree)
  5. Sub Sea Well…

Mud Log Gas (background, drilled, swab, connection, trip)

 The gas readings are obtained by the mud loggers from gas analysis equipment and are classified according to the operation that releases the gas into the borehole (background, drilled,…

Well Control - Shallow Gas

Some areas are notorious for the presence of hydrostatically pressured gas pockets at relatively shallow depths.

1 Prediction of shallow gas

Although the location of gas pockets is difficult to…

Shallow Gas - Planning Guidelines

Shallow gas is defined as any hydrocarbon-bearing zone which may be encountered at a depth close to the surface or mudline. Generally it is not possible to close-in and contain a gas influx from a…