CN115538941B

CN115538941B - A method for orientation in the case of magnetic interference during offshore surface orientation

Info

Publication number: CN115538941B
Application number: CN202110727289.7A
Authority: CN
Inventors: 毕研涛; 曹向峰; 杨春旭; 曹继飞; 杨泽宁; 董志辉; 刘晓兰; 张蒙; 祝靖
Original assignee: Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp; Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
Current assignee: Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp; Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2025-05-30
Anticipated expiration: 2041-06-29
Also published as: CN115538941A

Abstract

The invention is used in the field of offshore oil and gas drilling, and relates to an orientation method for the condition of magnetic interference when the offshore surface layer is oriented, which is very dense in offshore well arrangement, the distance between wells is 1.6x1.8m, an MWD while drilling instrument is influenced by a water isolation pipe or a casing pipe of an adjacent well, and the problem of inaccurate magnetic tool face exists. The method is mainly divided into two parts, wherein the first part marks the directional azimuth of construction at a round wellhead in an empty well state, the second part accurately extends the bending point mark of the power drilling tool to the uppermost drilling tool, and when the drilling tool goes down to the bottom of the well, the bending point mark on the drilling tool is turned to the directional azimuth mark through top drive, so that directional drilling can be started.

Description

Orientation method for use under magnetic interference condition during orientation of offshore surface layer

Technical Field

The invention relates to the technical field of petroleum drilling, in particular to an orientation method used under the condition of magnetic interference when an offshore surface layer is oriented.

Background

At present, in offshore oil exploration and development, due to the limitation of platform conditions, well arrangement is very dense, and the distance between wells is 1.6x1.8m, so that anti-collision is an extremely important work.

Therefore, most offshore drilling construction needs surface layer orientation to perform barrier-winding and collision prevention, and the nearest distance between two wells is increased as much as possible.

However, as the magnetic tool surface provided by the currently used while-drilling instrument is calculated by the magnetic field, when a water isolation pipe or a casing pipe exists around, the magnetic field is disturbed, the magnetic tool surface can be inaccurate, the situation that the track is inaccurate exists when the construction is performed under the inaccurate tool surface, the actual track occupies the space of a lower well and even collides with an adjacent well, and therefore larger economic loss is caused.

Disclosure of Invention

The invention aims at overcoming the defects in the prior art and provides an orientation method used under the condition of magnetic interference when the offshore surface layer is oriented.

The method comprises the following steps of firstly, in an empty well state before drilling, utilizing a square at a slope of a drilling floor surface, taking the boundary edge of a ramp and the drilling floor surface as one side, and making a vertical line in the direction of the center of a well mouth, secondly, irradiating a laser straight line in the direction of the vertical line, namely, the direction of the laser straight line towards the ramp is the first direction of a drilling platform, thirdly, making a short line mark on the outer drilling floor of the circular well mouth in the direction of the laser straight line at the positions close to and far from the circular well mouth, fourthly, overlapping the center of a drill gauge and the center of the well mouth, placing the drill head on the drilling floor surface, utilizing marks on the drill gauge to divide the well mouth into a plurality of blocks, setting the included angle between every two mark points, finding the directional orientation (1) according to the first direction of the drilling floor surface and the divided circle, thirdly, irradiating the laser straight line in the direction of the drilling floor, making a mark on the upper side and the lower side of the drilling floor surface, and making a drilling tool at the position of the upper side and the lower side of the drilling floor surface, and making a drilling tool at the lower side of the drilling floor surface, and finally, making a drilling tool mark on the lower side of the drilling floor surface and the drilling floor surface when the drilling floor surface is in the vertical direction, and the drilling floor surface is kept at the lower than the upper side.

Further, in the fourth step, the well head is equally divided into 12 or 24 blocks by using the marks on the drill gauge.

Further, in the fourth step, after the wellhead is equally divided, the included angle between every two marking points is 30 or 15 degrees.

Further, the laser straight line is irradiated by a laser torch or a laser pen.

In the third step, short line marks are respectively made on the near and far junction of the laser straight line and the round wellhead along the laser straight line direction to the outer drilling surface of the round wellhead by using chalk.

In the third step, paint is used for marking short lines on the near and far junction of the laser straight line and the round wellhead along the laser straight line direction to the outer drilling surface of the round wellhead.

The method for determining the tool face by marking has the beneficial effects that 1, the problem that the tool face provided by the instrument while drilling is inaccurate under the magnetic interference condition is solved, the risk of collision with an adjacent well is effectively reduced, and the drilling risk is reduced.

2. The method for determining the tool face by marking is simple in construction, economical and practical, and improves the drilling precision.

Drawings

And no.

Detailed Description

The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.

The invention relates to an orientation method used under the condition of magnetic interference when the offshore surface layer is oriented, which is suitable for offshore oil and natural gas oriented drilling, the initial orientation is marked at a wellhead by utilizing the first orientation of a drilling platform provided by a drilling design, and the marking is carried out at the upper part of a drilling tool according to the bending point marking of a power drilling tool and a laser torch.

The method comprises the steps of marking an initial directional azimuth at a round wellhead in an empty well state by utilizing a square and a laser flashlight, accurately extending a bent point mark of a power drilling tool to the uppermost drilling tool by utilizing the laser flashlight, and turning the bent point mark on the drilling tool to the directional azimuth mark through top driving after the drilling tool is lowered to the bottom of the well.

The method comprises the specific steps of firstly, utilizing a square at a slope of a drill floor surface in an empty well state before drilling, taking the boundary edge of a ramp and the drill floor surface as one side, and making a vertical line towards the center of a well head, secondly, utilizing a laser torch to irradiate in the direction of the vertical line (the direction of the laser straight line towards the ramp is the first direction of the drill floor), thirdly, utilizing chalk or paint to make a short line mark towards the outer drill floor surface of the circular well head in the laser direction at the near and far junction of the laser and the circular well head, fourthly, enabling the center of the drill floor surface to coincide with the center of the well head, placing the mark on the drill floor surface, utilizing the mark on the drill floor surface to divide the well head into 12 or 24 pieces, enabling the included angle of each two mark points to be 30 or 15 degrees, finding the directional orientation (1) according to the first direction of the drill floor, after bottom combination is well, thirdly, enabling the laser torch to coincide with the first direction of the bend point mark, enabling the upper drill floor to irradiate in the direction, enabling the tool to be located at the upper part of the second drill floor surface along the laser direction, enabling the upper part of the laser to coincide with the bend point mark, enabling the lower part to be perpendicular to the first direction of the bend point, and enabling the drill floor surface to be perpendicular to be in the direction of the drill floor surface, and enabling the drill floor surface to be perpendicular to be in the direction of the first step, and enabling the drill floor surface to be perpendicular to be in the drilling pillar, and enabling the drilling step to be downwards and downwards when drilling step is completely coincident.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims

1. The method is characterized by comprising the following steps of firstly, in an empty well state before drilling, using a square at a slope of a drilling floor, taking the boundary edge of the slope and the drilling floor as one side, and making a vertical line towards the center of a wellhead; the method comprises the steps of a first step of irradiating a laser straight line along a vertical line direction, wherein the direction of the laser straight line towards a ramp is the first direction of a drilling platform, a third step of marking the intersection of the laser straight line and a round wellhead towards the outer drilling surface of the round wellhead along the laser straight line direction, a fourth step of superposing the circle center of a drill bit gauge and the circle center of the wellhead on the drilling surface, uniformly dividing the wellhead into a plurality of blocks by using the mark on the drill bit gauge, setting the included angle of each two mark points, finding the orientation direction (1) according to the first direction of the drilling platform and the divided circle, a fifth step of locating the bent point mark of a power drilling tool after the bottom drilling tool is assembled, a sixth step of superposing the laser straight line and the bent point mark towards the upper drilling tool, keeping the same with the bent point at the vertical direction of the lower part by using the mark point which is last made on the upper drilling tool of the two layers, a eighth step of repeatedly marking the drilling tool at the upper part of the lower column until the bottom drilling tool is completely orientated, and the drilling tool is started when the bottom drilling tool is orientated to the bottom drilling position, and the drilling tool is completely orientated at the bottom of the moment.

2. The method according to claim 1, wherein in the fourth step, the wellhead is equally divided into 12 or 24 blocks by using the marks on the drill gauge.

3. The method according to claim 2, wherein in the fourth step, after the wellhead is equally divided, the included angle between each two marking points is 30 or 15 degrees.

4. A method for orientation in the presence of magnetic interference in the orientation of marine surfaces according to claim 1, wherein the laser line is irradiated by a laser torch or a laser pen.

5. The method for the orientation of the offshore surface layer under the condition of magnetic interference according to claim 1, wherein in the third step, short line marks are respectively made on the outer drilling surface of the circular wellhead along the laser straight line direction at the near and far intersections of the laser straight line and the circular wellhead by using chalk.

6. The method according to claim 1, wherein in the third step, paint is used to mark the laser line at the junction of the laser line and the near and far of the circular wellhead along the laser line to the outer drilling surface of the circular wellhead.