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Well bore structure penetrating through high-pressure layer and basalt collapse layer and construction method of well bore structure

A wellbore structure and construction method technology, applied in drilling equipment, earthwork drilling, wellbore/well components, etc., can solve the problems of wellbore collapse, overflow and lost circulation

Pending Publication Date: 2020-11-10
CNPC DRILLING RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a wellbore structure passing through the high-pressure layer and the basalt collapsed layer and its construction method, so as to alleviate the occurrence of overflow, lost circulation, Accidents such as well wall collapse and pipe sticking and complex technical problems

Method used

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  • Well bore structure penetrating through high-pressure layer and basalt collapse layer and construction method of well bore structure
  • Well bore structure penetrating through high-pressure layer and basalt collapse layer and construction method of well bore structure
  • Well bore structure penetrating through high-pressure layer and basalt collapse layer and construction method of well bore structure

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Effect test

Embodiment 1

[0058] The present invention provides a method for constructing the shaft structure under the geological conditions with basalt collapse layer 72, such as Figure 2a and image 3 As shown, the construction method includes: step S10, drilling the first well section 101, running the first casing string 10, and cementing; step S20, drilling the second well section 201, running the second Drilling casing string 20, cementing; step S30, drilling third drilling section 301, drilling third drilling section 301 to the upper part of high-pressure layer 71, lowering third casing string 30, cementing; Step S40, drilling the fourth well section 401, the fourth well section 401 drills through the high-pressure layer 71, and drills to the upper part of the basalt collapse layer 72, runs the fourth casing string 40, and cements the well; S50, drill the fifth well section 501, the fifth well section 501 drills through the collapsed basalt layer 72, and drills to the upper part of the oil and...

Embodiment 2

[0078] The present invention provides a well structure under geological conditions with basalt collapse layer 72, such as figure 1 and Figure 2a As shown, the wellbore structure includes: a first casing string 10, a second casing string 20, a third casing string 30, a fourth casing string 40, and a fifth casing string. The pipe string 50 and the sixth tailpipe string 60; run the second casing string 20 from the first casing string 10; run the third casing string 30 to the top of the high-voltage layer 71; The fourth casing string 40 runs through the high-pressure layer 71, and goes down to the upper part of the basalt collapsed layer 72, the fourth casing string isolates the high-pressure layer; the fifth casing string 50 penetrates the basalt collapsed layer 72, and Run into the upper part of the oil and gas target layer 73, the fifth casing string seals off the basalt collapse layer; the sixth liner string 60 is run into the oil and gas target layer 73.

[0079] In this c...

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Abstract

The invention provides a well bore structure penetrating through a high-pressure layer and a basalt collapse layer and a construction method of the well bore structure. The construction method comprises the steps that S10, a first-spud-in casing string is tripped in, and well cementation is conducted; S20, a second-spud-in casing string is tripped in, and well cementation is conducted; S30, a third-spud-in well section is drilled to the upper portion of the high-pressure layer, a third-spud-in casing string is tripped in, and well cementation is conducted; S40, a fourth-spud-in well section drills through the high-pressure layer and is drilled to the upper portion of the basalt collapse layer, a fourth-spud-in casing string is tripped in, and well cementation is conducted; S50, a fifth-spud-in well section drills through the basalt collapse layer and drills to the upper portion of an oil and gas target layer, a fifth-spud-in casing string is tripped in, and well cementation is conducted; and S60, a sixth-spud-in well section is drilled to the oil and gas target layer, a sixth-spud-in tail pipe string is tripped in, and well cementation is conducted. By means of the method, the technical problems that when well drilling is conducted under the geological condition of the high-pressure layer and the basalt collapse layer, accidents such as overflowing, well leakage, well wall collapse and drill jamming are prone to happening, and complexity is caused are solved.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas exploration and development, in particular to a well body structure passing through a high-pressure layer and a collapsed basalt layer and a construction method thereof. Background technique [0002] In oil and gas exploration and development, it is necessary to establish an oil and gas channel between the surface and underground oil and gas layers, that is, oil and gas wells. During the establishment of oil and gas wells, casings are used to isolate the formation, and cement is used to fix the outer wall of the casing to the formation, thus forming a combination of casing and cement. The combination of the casing and cement is the wellbore structure. As one of the key contents of oil and gas exploration, the wellbore structure needs to fully consider the particularity of the pore pressure and geological conditions of the drilled formations. Different casings isolate different pressur...

Claims

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Application Information

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IPC IPC(8): E21B17/00E21B33/05E21B33/14
CPCE21B17/00E21B33/05E21B33/146
Inventor 李洪邹灵战刘力汪海阁卓鲁斌毕文欣
Owner CNPC DRILLING RES INST
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