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Natural gas horizontal well drilling mechanism

A technology for horizontal wells and natural gas, which is applied in the exploration and development of natural gas and the petroleum field. It can solve the problems of frequent adjustment of wellbore trajectory control in the horizontal section, the inability of the drill bit to apply effective drilling pressure, and the large fluctuation range of compressive strength, etc., to improve the single drill bit The effects of increasing footage, enhancing sand-carrying ability, and shortening drilling cycle

Inactive Publication Date: 2014-01-01
中国石油集团川庆钻探工程有限公司长庆钻井总公司
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Problems solved by technology

[0003] In order to solve the above-mentioned existing drilling technology, the well deviation of the vertical well section is easy to exceed the standard, the sand carrying in the vertical well section is difficult, the drillability of the lower formation is poor, and the compressive strength fluctuates in a large range; Easy to support the pressure, the drilling pressure is applied on the screw centralizer, and the effective drilling pressure cannot be applied to the drill bit; the adjustment of the wellbore trajectory in the horizontal section is frequently controlled, and the frictional torque is relatively large during sliding drilling. The present invention aims to provide a Drilling technology for natural gas horizontal wells. During the drilling process, the drilling technology used in different well sections is optimized. At the same time, the drilling tool assembly of the whole well section is improved according to the different needs of different well sections. Different drilling tool assemblies are used for each well section. , making the drilling process more stable, safe and efficient

Method used

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Embodiment Construction

[0015] The present invention will be further described below.

[0016] A natural gas horizontal well drilling process, each well section sequentially adopts the following drilling tool assemblies from bottom to top:

[0017] (1) The drilling tool assembly used in the vertical well section is: Φ228.6mm631PDC drill bit 1, 0.75 degree 7LZΦ185mm630×410 screw rod 2, Φ224mm411×410 rigid centralizer 3, Φ178mm 411×410MWD wireless directional joint while drilling 4, Φ178mm411×410 non-magnetic Drill collar 5, 2 Φ178mm 411×410 drill collar 6, 411×460 adapter 7, 15 Φ165mm 461×460 drill collar 8, 461×410 adapter 9, 45 Φ127mm411×410 heavy drill pipe 10 and Φ127mm411×410 Drill pipe 11. Among them, 411 X410 is the buckle type, "4" stands for 4 inches, the first "1" stands for the inner flat joint, the second "1" stands for the male buckle; "0" stands for the female buckle. When connecting, the male buckle is connected with the female buckle. The lower box of Φ185mm630×410 screw rod 2 is co...

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Abstract

The invention discloses a natural gas horizontal well drilling mechanism. The construction efficiency of all well sections is effectively improved and the drilling period is shortened by optimizing drilling tool assemblies. A drilling tool structure of a straight well section is optimized, and well deviation is effectively controlled by 1.5-degree screws. A drilling tool of an inclined well section is optimized, a bent screw is used in cooperation with a PDC drill bit to directly point the direction, and the construction efficiency of the inclined well section is improved. A drilling tool structure of a horizontal section is optimized, a 1.25-degree screw is adopted, the well deviation abrupt changing is correct, the sliding proportion is reduced, and the rate of penetration in the horizontal section is improved.

Description

technical field [0001] The invention relates to the fields of exploration and development of oil and natural gas, in particular to the drilling technology of natural gas horizontal wells in the Sulige block. technical background [0002] Horizontal well development has become the main way of large-scale development of Sulige gas field. With the increasing number of horizontal wells and the length of the horizontal section, the well deviation in the vertical well section is easy to exceed the standard during construction, the sand carrying in the vertical well section is difficult, and the drillability of the lower formation is poor; Easy to support pressure; the horizontal section adjusts the wellbore trajectory control frequently, and the frictional torque is relatively large during sliding drilling. Contents of the invention [0003] In order to solve the above-mentioned existing drilling technology, the well deviation of the vertical well section is easy to exceed the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04
Inventor 石崇东张建卿李录科王万庆王浩谌建祁何辉王政
Owner 中国石油集团川庆钻探工程有限公司长庆钻井总公司
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