Cycle of well construction. The drilling speed concept.

Complete cycle of drilling consists of the following main elements:

1) Preparatory work for the construction of wells, 2) Derrick work, and 3) the preparatory work for drilling wells, and 4) well drilling, 5) test wells on the flow of oil or gas, and 6) the dismantling of drilling and power equipment, towers and structures privyshechnyh.

The start of drilling wells - time of first descent drill string for penetration, and the end of drilling - the end of emission drill pipe on the catwalk after washing wells and tests on columns germetichnost.Dlya determining the length of the most time-consuming step - well drilling - a balance sheet of calendar time. The balance of calendar time includes the following items.

1. Productive drilling time tnp, including driving of time - Tм - mechanical drilling, tсп - tripping operation, the time for preparatory work tпвр support, time to mount a well tкр.

2. Time for repairs tрем.

3. Time to eliminate the complications arising from the wellbore for geological reasons, tос.

4. Unproductive time tn, which includes: the time to eliminate accidents tа;

time lost due to downtime on organizational and technical reasons, tn.

The balance of calendar time drilling and fastening is as follows:

The balance of calendar time and its components are the basis for determining the different drilling rates that determine the rate of the well.

Technical penetration rate is determined for the sinking of one month of productive work rig (m / st.-Months):

where Hп - total footage for a certain period of time, m, 720 - Duration 1 Article-month drilling, hours

Commercial penetration rate is determined for the sinking of one month of the rig (m / st.-Months):

The magnitude of the commercial speed of impact factors of technical-technological and organizational measures.

Cyclic rate of drilling (m / st.-Months) is determined for the sinking of the well construction cycle time:

where Tц - cycle time building wells, including