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Water-based drilling fluids using latex additives

A water-based drilling fluid, drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as difficulty in achieving the required balance

Inactive Publication Date: 2006-07-26
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This required balance is difficult to achieve due to the requirement that the drilling fluid perform multiple tasks simultaneously

Method used

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  • Water-based drilling fluids using latex additives
  • Water-based drilling fluids using latex additives
  • Water-based drilling fluids using latex additives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of Fluid Intermediates

[0038] components

[0039] NEW DRILL PLUS

[0040] Fluid with latex and NEWDRILL PLUS is light brown. Add LD8 to control foaming. The resulting mixture was hot rolled at 150°F (66°C) for 4 hours. The final pH was 10.75.

Embodiment 2

[0042] Determination of shale pressure penetration

[0043] The pore pressure transmission (PPT) device was referenced to a 1500 psi (10300 kPa) Hassler cell, which is a drill core rod design of 2.5 cm to 7.5 cm in length and 2.5 cm in diameter. Hassler cells are cylinders with pistons inserted into each end. The drill core is held between the two pistons. A rubber bushing is placed around the core and piston to seal around the core and prevent flow around the core. Pressurizing the outside of the bushing creates a good seal. These tests used drill cores with a diameter of 25 mm and a length of 25 mm.

[0044] The low pressure side (formation side) of the drill core is fitted with a 1 liter, 2000psi (13800kPa) stainless steel reservoir to provide back pressure. The high pressure side of the core is connected to two similar reservoirs, one for the microbore fluid and the other for the test fluid. The pressure in each reservoir was controlled using manual regulators fed thr...

Embodiment 3

[0055] components

[0056] Sodium aluminate and AIRFLEX 728 latex were mixed together and allowed to sit over the weekend. The mixture was then hot rolled at 150°F (66°C) for 2 hours. Then salt and polymer are added. The order of addition to the sodium aluminate / latex mixture was: PHPA (partially hydrolyzed polyacrylamide; NEWDRILL PLUS), then mix, then half the salt, then MILPAC LV, then the other half of the salt. Heat roll the mixture overnight.

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Abstract

A water-based drilling fluid having a polymer latex capable of providing a deformable latex film on at least a portion of a subterranean formation has been discovered to provide reduced drilling fluid pressure invasion when used to drill in shale formations for hydrocarbon recovery operations. A precipitating agent such as a silicate or an aluminum complex (e.g. sodium aluminate) is preferably used in conjunction with the polymer. Typically, the water present contains a salt to form a brine, often to saturation, although the invention may be practiced with fresh water. If a salt is employed, it is often helpful to additionally employ a surfactant, such as a betaine, for example.

Description

Background of the invention [0001] Drilling fluids for use in the drilling of subterranean oil and gas wells, as well as other drilling fluid applications and drilling procedures are known. In rotary drilling, the drilling fluid (also known as drilling mud) or simply "mud" is expected to have many functions and characteristics. The drilling fluid is expected to carry the cuttings up the bit, transport them up into the annulus, and separate them at the interface while cooling and cleaning the rotating bit. The drilling mud is also intended to reduce friction between the drill pipe and the sides of the borehole while maintaining stability in the uncased portion of the borehole. Drilling fluids are formulated to prevent the unwanted influx of formation fluids from penetrating permeable rock and also often form a thin, low-permeability filter cake that temporarily seals pores, other openings, and holes that the drill bit is expected to penetrate. Strata. Drilling fluids are als...

Claims

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Application Information

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IPC IPC(8): C09K8/12
Inventor C·J·斯托二世R·G·布兰德D·克拉珀项涛S·本伊萨
Owner BAKER HUGHES INC
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