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A kind of oil and gas well fracturing construction method

A construction method and technology for oil and gas wells, applied in the direction of earthwork drilling, wellbore/well components, production fluids, etc., can solve the problems of high risk of drilling and grinding, high cost, long operation time, etc., and achieve the goal of reducing the risk of bridge plug construction Effect

Active Publication Date: 2021-06-22
SICHUAN WELDON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of composite bridge plugs or insufficient dissolution of soluble bridge plugs, coiled tubing is required for drilling and grinding, which has high risk of drilling and grinding, long operation time and high cost

Method used

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  • A kind of oil and gas well fracturing construction method
  • A kind of oil and gas well fracturing construction method
  • A kind of oil and gas well fracturing construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A fracturing construction method for an oil and gas well. The first section uses oil-connecting or toe-end sliding sleeves to complete perforation, and the following steps are used for construction in the casing deformation section:

[0056] In step (1), the coiled tubing completes 48 perforations in the casing deformation section of the horizontal well,

[0057] Step (2), according to the number of perforation holes, prepare 48 bio-knots and 1 party strengthening fluid, and seal the perforation section of the previous section;

[0058] Step (3), use the coiled tubing to enter the perforating gun to complete 48 perforating constructions;

[0059] In step (4), repeat steps (2) and (3) to complete 3 stages of perforation;

[0060] Step (5), pumping in the strengthening solution to block the first / 2 layer, the bioknot will dissolve slowly in the strengthening solution, and seal the gap after the bioknot dissolves, and keep it in a blocked state for 15-20 days;

[0061] S...

Embodiment 2

[0064] Using the same method as in Example 1, the difference is that capsule particles and hydration agents are added to the pumped strengthening liquid. After entering the formation, the capsule will be broken under the action of the ground stress, and the strengthening liquid will be hydrated. will not harm the formation.

Embodiment 3

[0066] The preparation of biological knots in Examples 1 and 2 selects a degradable polyglycolic acid material with a tensile strength of 120 MPa and a molecular weight of 80w, spins the polyglycolic acid material, weaves it into a rope, and then uses this polyglycolic acid rope to make Form a knot with a diameter of 17-20mm, the diameter of the knot can be adjusted according to the hole to be blocked, and a braided wire with a length of 20-25mm is left at both ends of the knot.

[0067] The dissolution test was carried out on the biological knot, the test temperature was 90°C, and the medium was clear water.

[0068] Test results: Under the condition of 90 ℃ and clear water, it began to dissolve on the 4th day, the knot part was completely broken on the 6th day, and completely dissolved on the 11th day. After drying and weighing, the overall dissolution rate reaches 98.8%.

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Abstract

The invention discloses a fracturing construction method of an oil and gas well. The fracturing construction method of an oil and gas well adopts the technique of blocking perforation holes with biological knots. This fracturing construction technology uses biological knots to replace the segmented temporary plugging effect of bridge plugs. The technology of biological knots to plug perforation holes can not only solve the construction of the casing variable section, but also can be used in the normal whole well section. At the same time, the biological knots can also Used for steering action during fracturing. The invention adopts the staged temporary plugging process of environmental protection biological knots, reduces the risk of bridge plug construction, uniformly fractures the reservoir, and can perform staged fracturing on the casing deformed section, reducing the impact on the production of the well caused by the casing deformation.

Description

technical field [0001] The invention belongs to the field of geological exploration and development, and in particular relates to an oil and gas well fracturing construction method. Background technique [0002] With the continuous deepening of petroleum exploration and development, unconventional oil and gas reservoirs with low permeability and low porosity are increasing, and conventional vertical wells can no longer meet the development requirements. Horizontal wells have gradually become a necessary means to improve the comprehensive benefits of oilfield exploration and development. Horizontal wells have the advantages of large drainage area, high single well production, high penetration, high degree of reserve production, and can effectively avoid obstacles and harsh environments. Horizontal well staged fracturing technology has become the main body of unconventional oil and gas development technology. [0003] As a typical unconventional oil and gas reservoir resource...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/116E21B33/138E21B43/22
CPCE21B33/138E21B43/116E21B43/16E21B43/26
Inventor 田之江张其平易建国张克成刘严
Owner SICHUAN WELDON CHEM
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