Construction method for two-section horizontal well

A construction method and horizontal well technology, applied in drilling equipment and methods, directional drilling, earthwork drilling and production, etc., can solve the problems of long reservoir reconstruction period, high development cost, and long completion time, so as to ensure smooth connection performance, good sealing effect

Active Publication Date: 2016-12-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Three-cut drilling method: there is a long intermediate completion time, a long drilling and completion cycle, and a long reservoir stimulation cycle. Due to the limitation of the small size of the completion string, it is impossible to implement large-scale space cube deep stimulation on the reservoir, and the reservoir stimulation The effect is limited, and the development cost is high. At the same time, due to the small size of the completion string, it is impossible to implement technical measures such as workover, water shutoff, and repeated fracturing in the horizontal section during later production, which is not conducive to the economical and efficient development of horizontal wells
However, ther

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  • Construction method for two-section horizontal well
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  • Construction method for two-section horizontal well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A method for constructing a second open horizontal well, comprising the following steps:

[0051] S1. A drill bit with an outer diameter of 346mm is used for the first drilling, and the well is drilled to a depth of 700 meters, and then an oblong casing with an outer diameter of 273mm is inserted into the well for cementing;

[0052] S2. A drill bit with an outer diameter of 222mm was used in the second straight well section, and the well was drilled to a depth of 2,800 meters. A drill bit with an outer diameter of 215.9mm was used in the second open well section and the horizontal section until the entire well was drilled;

[0053] S3. Connect a single milling column and a double milling column to the drilling tool to simulate the second-opening horizontal well cementing and completion integrated pipe string device to run the well, smooth the borehole wall of the drilled hole, and expand the small diameter of the hole;

[0054] S4. After the well flow is normal, the dr...

Embodiment 2

[0064] A method for constructing a second open horizontal well, comprising the following steps:

[0065] S1. A drill bit with an outer diameter of 346mm was used for the first drilling, and the well was drilled to a depth of 750 meters, and then an oblong casing with an outer diameter of 273mm was inserted into the well for cementing;

[0066] S2. A drill bit with an outer diameter of 222mm was used for the second straight well section, and the well was drilled to a depth of 2,850 meters. A drill bit with an outer diameter of 215.9mm was used for the second open well section and the horizontal section until the entire well was drilled;

[0067] S3. Connect a single milling column and a double milling column to the drilling tool to simulate the second-opening horizontal well cementing and completion integrated pipe string device to run the well, smooth the borehole wall of the drilled hole, and expand the small diameter of the hole;

[0068] S4. After the well passage is normal...

Embodiment 3

[0087] A method for constructing a second open horizontal well, comprising the following steps:

[0088] S1. A drill bit with an outer diameter of 346mm is used for the first drilling, and the well is drilled to a depth of 800 meters, and then an oblong casing with an outer diameter of 273mm is inserted into the well for cementing;

[0089] S2. A drill bit with an outer diameter of 222mm was used in the second straight well section, and the well was drilled to a depth of 2,900 meters. A drill bit with an outer diameter of 215.9mm was used in the second open well section and the horizontal section until the entire well was drilled;

[0090] S3. Connect a single milling column and a double milling column to the drilling tool to simulate the second-opening horizontal well cementing and completion integrated pipe string device to run the well, smooth the borehole wall of the drilled hole, and expand the small diameter of the hole;

[0091] S4. After the well flow is normal, the dr...

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Abstract

The invention discloses a construction method for a two-section horizontal well. The construction method comprises the following steps of: for the first section, drilling to 700-800 m of the well depth using a 346 mm drill bit; for the second straight well section, drilling to 2800-2900 m of the well depth using a 222 mm drill bit, and for an inclined and horizontal well sections of the second section, drilling to the whole well depth using a 215.9 mm drill bit and thus finishing drilling; carrying out a drifting process; lowering a well cementing and completion integrated tubular column device for the second-section horizontal well, and circulating mud by more than 1.5 cycles; injecting 1.4-1.5 kg/m<3> of leading cement slurry; injecting 17-25 m<3> of cement slurry; injecting 5 m3 of clear water, and 2 m<3> of sodium carboxymethylcellulose spacer fluid; injecting 25-30 m<3> of potassium chloride solution instead of mud, and throwing in one 41.3 mm setting ball; injecting 50-60 m<3> of potassium chloride solution; carrying out electrical logging on the well cementing quality; and carrying out fracturing construction inspection. The construction method for a two-section horizontal well has the advantages that the speed of drilling is improved, adjustment can be achieved in case of a great change in the dip angle of a reservoir stratum, and high flexibility.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to a construction method for a double-opening horizontal well. Background technique [0002] Drilling in oil and gas production mainly includes drilling engineering and well completion engineering. Drilling engineering is the drilling process from spud to drilling to the target layer of exploration and development, and the complete well footage is drilled. Drilling refers to the start of drilling with the first drill bit after entering the conduit or each layer of casing. Drilling can be divided into the first spud, the second spud, the third spud, etc. A well is drilled from zero depth, which is called the first spud, referred to as the first spud; spud after the surface casing is cemented, called the second spud, referred to as the second spud; Drilling is called the third drilling, referred to as three drilling; if the technical casing has two or three layers, the...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B33/13E21B33/122E21B33/128E21B34/14E21B34/08E21B17/00
CPCE21B7/046E21B17/00E21B33/122E21B33/1285E21B33/13E21B34/08E21B34/14
Inventor 陈郸姚立新杨南鹏张庆赵绍新
Owner BC P INC CHINA NAT PETROLEUM CORP
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